| /* |
| * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_shared.h" |
| #include "xfs_format.h" |
| #include "xfs_log_format.h" |
| #include "xfs_trans_resv.h" |
| #include "xfs_bit.h" |
| #include "xfs_sb.h" |
| #include "xfs_mount.h" |
| #include "xfs_defer.h" |
| #include "xfs_da_format.h" |
| #include "xfs_da_btree.h" |
| #include "xfs_dir2.h" |
| #include "xfs_inode.h" |
| #include "xfs_btree.h" |
| #include "xfs_trans.h" |
| #include "xfs_inode_item.h" |
| #include "xfs_extfree_item.h" |
| #include "xfs_alloc.h" |
| #include "xfs_bmap.h" |
| #include "xfs_bmap_util.h" |
| #include "xfs_bmap_btree.h" |
| #include "xfs_rtalloc.h" |
| #include "xfs_error.h" |
| #include "xfs_quota.h" |
| #include "xfs_trans_space.h" |
| #include "xfs_buf_item.h" |
| #include "xfs_trace.h" |
| #include "xfs_symlink.h" |
| #include "xfs_attr_leaf.h" |
| #include "xfs_filestream.h" |
| #include "xfs_rmap.h" |
| #include "xfs_ag_resv.h" |
| #include "xfs_refcount.h" |
| |
| |
| kmem_zone_t *xfs_bmap_free_item_zone; |
| |
| /* |
| * Miscellaneous helper functions |
| */ |
| |
| /* |
| * Compute and fill in the value of the maximum depth of a bmap btree |
| * in this filesystem. Done once, during mount. |
| */ |
| void |
| xfs_bmap_compute_maxlevels( |
| xfs_mount_t *mp, /* file system mount structure */ |
| int whichfork) /* data or attr fork */ |
| { |
| int level; /* btree level */ |
| uint maxblocks; /* max blocks at this level */ |
| uint maxleafents; /* max leaf entries possible */ |
| int maxrootrecs; /* max records in root block */ |
| int minleafrecs; /* min records in leaf block */ |
| int minnoderecs; /* min records in node block */ |
| int sz; /* root block size */ |
| |
| /* |
| * The maximum number of extents in a file, hence the maximum |
| * number of leaf entries, is controlled by the type of di_nextents |
| * (a signed 32-bit number, xfs_extnum_t), or by di_anextents |
| * (a signed 16-bit number, xfs_aextnum_t). |
| * |
| * Note that we can no longer assume that if we are in ATTR1 that |
| * the fork offset of all the inodes will be |
| * (xfs_default_attroffset(ip) >> 3) because we could have mounted |
| * with ATTR2 and then mounted back with ATTR1, keeping the |
| * di_forkoff's fixed but probably at various positions. Therefore, |
| * for both ATTR1 and ATTR2 we have to assume the worst case scenario |
| * of a minimum size available. |
| */ |
| if (whichfork == XFS_DATA_FORK) { |
| maxleafents = MAXEXTNUM; |
| sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS); |
| } else { |
| maxleafents = MAXAEXTNUM; |
| sz = XFS_BMDR_SPACE_CALC(MINABTPTRS); |
| } |
| maxrootrecs = xfs_bmdr_maxrecs(sz, 0); |
| minleafrecs = mp->m_bmap_dmnr[0]; |
| minnoderecs = mp->m_bmap_dmnr[1]; |
| maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs; |
| for (level = 1; maxblocks > 1; level++) { |
| if (maxblocks <= maxrootrecs) |
| maxblocks = 1; |
| else |
| maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs; |
| } |
| mp->m_bm_maxlevels[whichfork] = level; |
| } |
| |
| STATIC int /* error */ |
| xfs_bmbt_lookup_eq( |
| struct xfs_btree_cur *cur, |
| xfs_fileoff_t off, |
| xfs_fsblock_t bno, |
| xfs_filblks_t len, |
| int *stat) /* success/failure */ |
| { |
| cur->bc_rec.b.br_startoff = off; |
| cur->bc_rec.b.br_startblock = bno; |
| cur->bc_rec.b.br_blockcount = len; |
| return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat); |
| } |
| |
| STATIC int /* error */ |
| xfs_bmbt_lookup_ge( |
| struct xfs_btree_cur *cur, |
| xfs_fileoff_t off, |
| xfs_fsblock_t bno, |
| xfs_filblks_t len, |
| int *stat) /* success/failure */ |
| { |
| cur->bc_rec.b.br_startoff = off; |
| cur->bc_rec.b.br_startblock = bno; |
| cur->bc_rec.b.br_blockcount = len; |
| return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat); |
| } |
| |
| /* |
| * Check if the inode needs to be converted to btree format. |
| */ |
| static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork) |
| { |
| return whichfork != XFS_COW_FORK && |
| XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS && |
| XFS_IFORK_NEXTENTS(ip, whichfork) > |
| XFS_IFORK_MAXEXT(ip, whichfork); |
| } |
| |
| /* |
| * Check if the inode should be converted to extent format. |
| */ |
| static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork) |
| { |
| return whichfork != XFS_COW_FORK && |
| XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE && |
| XFS_IFORK_NEXTENTS(ip, whichfork) <= |
| XFS_IFORK_MAXEXT(ip, whichfork); |
| } |
| |
| /* |
| * Update the record referred to by cur to the value given |
| * by [off, bno, len, state]. |
| * This either works (return 0) or gets an EFSCORRUPTED error. |
| */ |
| STATIC int |
| xfs_bmbt_update( |
| struct xfs_btree_cur *cur, |
| xfs_fileoff_t off, |
| xfs_fsblock_t bno, |
| xfs_filblks_t len, |
| xfs_exntst_t state) |
| { |
| union xfs_btree_rec rec; |
| |
| xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state); |
| return xfs_btree_update(cur, &rec); |
| } |
| |
| /* |
| * Compute the worst-case number of indirect blocks that will be used |
| * for ip's delayed extent of length "len". |
| */ |
| STATIC xfs_filblks_t |
| xfs_bmap_worst_indlen( |
| xfs_inode_t *ip, /* incore inode pointer */ |
| xfs_filblks_t len) /* delayed extent length */ |
| { |
| int level; /* btree level number */ |
| int maxrecs; /* maximum record count at this level */ |
| xfs_mount_t *mp; /* mount structure */ |
| xfs_filblks_t rval; /* return value */ |
| |
| mp = ip->i_mount; |
| maxrecs = mp->m_bmap_dmxr[0]; |
| for (level = 0, rval = 0; |
| level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK); |
| level++) { |
| len += maxrecs - 1; |
| do_div(len, maxrecs); |
| rval += len; |
| if (len == 1) |
| return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) - |
| level - 1; |
| if (level == 0) |
| maxrecs = mp->m_bmap_dmxr[1]; |
| } |
| return rval; |
| } |
| |
| /* |
| * Calculate the default attribute fork offset for newly created inodes. |
| */ |
| uint |
| xfs_default_attroffset( |
| struct xfs_inode *ip) |
| { |
| struct xfs_mount *mp = ip->i_mount; |
| uint offset; |
| |
| if (mp->m_sb.sb_inodesize == 256) { |
| offset = XFS_LITINO(mp, ip->i_d.di_version) - |
| XFS_BMDR_SPACE_CALC(MINABTPTRS); |
| } else { |
| offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS); |
| } |
| |
| ASSERT(offset < XFS_LITINO(mp, ip->i_d.di_version)); |
| return offset; |
| } |
| |
| /* |
| * Helper routine to reset inode di_forkoff field when switching |
| * attribute fork from local to extent format - we reset it where |
| * possible to make space available for inline data fork extents. |
| */ |
| STATIC void |
| xfs_bmap_forkoff_reset( |
| xfs_inode_t *ip, |
| int whichfork) |
| { |
| if (whichfork == XFS_ATTR_FORK && |
| ip->i_d.di_format != XFS_DINODE_FMT_DEV && |
| ip->i_d.di_format != XFS_DINODE_FMT_UUID && |
| ip->i_d.di_format != XFS_DINODE_FMT_BTREE) { |
| uint dfl_forkoff = xfs_default_attroffset(ip) >> 3; |
| |
| if (dfl_forkoff > ip->i_d.di_forkoff) |
| ip->i_d.di_forkoff = dfl_forkoff; |
| } |
| } |
| |
| #ifdef DEBUG |
| STATIC struct xfs_buf * |
| xfs_bmap_get_bp( |
| struct xfs_btree_cur *cur, |
| xfs_fsblock_t bno) |
| { |
| struct xfs_log_item_desc *lidp; |
| int i; |
| |
| if (!cur) |
| return NULL; |
| |
| for (i = 0; i < XFS_BTREE_MAXLEVELS; i++) { |
| if (!cur->bc_bufs[i]) |
| break; |
| if (XFS_BUF_ADDR(cur->bc_bufs[i]) == bno) |
| return cur->bc_bufs[i]; |
| } |
| |
| /* Chase down all the log items to see if the bp is there */ |
| list_for_each_entry(lidp, &cur->bc_tp->t_items, lid_trans) { |
| struct xfs_buf_log_item *bip; |
| bip = (struct xfs_buf_log_item *)lidp->lid_item; |
| if (bip->bli_item.li_type == XFS_LI_BUF && |
| XFS_BUF_ADDR(bip->bli_buf) == bno) |
| return bip->bli_buf; |
| } |
| |
| return NULL; |
| } |
| |
| STATIC void |
| xfs_check_block( |
| struct xfs_btree_block *block, |
| xfs_mount_t *mp, |
| int root, |
| short sz) |
| { |
| int i, j, dmxr; |
| __be64 *pp, *thispa; /* pointer to block address */ |
| xfs_bmbt_key_t *prevp, *keyp; |
| |
| ASSERT(be16_to_cpu(block->bb_level) > 0); |
| |
| prevp = NULL; |
| for( i = 1; i <= xfs_btree_get_numrecs(block); i++) { |
| dmxr = mp->m_bmap_dmxr[0]; |
| keyp = XFS_BMBT_KEY_ADDR(mp, block, i); |
| |
| if (prevp) { |
| ASSERT(be64_to_cpu(prevp->br_startoff) < |
| be64_to_cpu(keyp->br_startoff)); |
| } |
| prevp = keyp; |
| |
| /* |
| * Compare the block numbers to see if there are dups. |
| */ |
| if (root) |
| pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz); |
| else |
| pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr); |
| |
| for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) { |
| if (root) |
| thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz); |
| else |
| thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr); |
| if (*thispa == *pp) { |
| xfs_warn(mp, "%s: thispa(%d) == pp(%d) %Ld", |
| __func__, j, i, |
| (unsigned long long)be64_to_cpu(*thispa)); |
| panic("%s: ptrs are equal in node\n", |
| __func__); |
| } |
| } |
| } |
| } |
| |
| /* |
| * Check that the extents for the inode ip are in the right order in all |
| * btree leaves. THis becomes prohibitively expensive for large extent count |
| * files, so don't bother with inodes that have more than 10,000 extents in |
| * them. The btree record ordering checks will still be done, so for such large |
| * bmapbt constructs that is going to catch most corruptions. |
| */ |
| STATIC void |
| xfs_bmap_check_leaf_extents( |
| xfs_btree_cur_t *cur, /* btree cursor or null */ |
| xfs_inode_t *ip, /* incore inode pointer */ |
| int whichfork) /* data or attr fork */ |
| { |
| struct xfs_btree_block *block; /* current btree block */ |
| xfs_fsblock_t bno; /* block # of "block" */ |
| xfs_buf_t *bp; /* buffer for "block" */ |
| int error; /* error return value */ |
| xfs_extnum_t i=0, j; /* index into the extents list */ |
| xfs_ifork_t *ifp; /* fork structure */ |
| int level; /* btree level, for checking */ |
| xfs_mount_t *mp; /* file system mount structure */ |
| __be64 *pp; /* pointer to block address */ |
| xfs_bmbt_rec_t *ep; /* pointer to current extent */ |
| xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */ |
| xfs_bmbt_rec_t *nextp; /* pointer to next extent */ |
| int bp_release = 0; |
| |
| if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) { |
| return; |
| } |
| |
| /* skip large extent count inodes */ |
| if (ip->i_d.di_nextents > 10000) |
| return; |
| |
| bno = NULLFSBLOCK; |
| mp = ip->i_mount; |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| block = ifp->if_broot; |
| /* |
| * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out. |
| */ |
| level = be16_to_cpu(block->bb_level); |
| ASSERT(level > 0); |
| xfs_check_block(block, mp, 1, ifp->if_broot_bytes); |
| pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes); |
| bno = be64_to_cpu(*pp); |
| |
| ASSERT(bno != NULLFSBLOCK); |
| ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount); |
| ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks); |
| |
| /* |
| * Go down the tree until leaf level is reached, following the first |
| * pointer (leftmost) at each level. |
| */ |
| while (level-- > 0) { |
| /* See if buf is in cur first */ |
| bp_release = 0; |
| bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno)); |
| if (!bp) { |
| bp_release = 1; |
| error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp, |
| XFS_BMAP_BTREE_REF, |
| &xfs_bmbt_buf_ops); |
| if (error) |
| goto error_norelse; |
| } |
| block = XFS_BUF_TO_BLOCK(bp); |
| if (level == 0) |
| break; |
| |
| /* |
| * Check this block for basic sanity (increasing keys and |
| * no duplicate blocks). |
| */ |
| |
| xfs_check_block(block, mp, 0, 0); |
| pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]); |
| bno = be64_to_cpu(*pp); |
| XFS_WANT_CORRUPTED_GOTO(mp, |
| XFS_FSB_SANITY_CHECK(mp, bno), error0); |
| if (bp_release) { |
| bp_release = 0; |
| xfs_trans_brelse(NULL, bp); |
| } |
| } |
| |
| /* |
| * Here with bp and block set to the leftmost leaf node in the tree. |
| */ |
| i = 0; |
| |
| /* |
| * Loop over all leaf nodes checking that all extents are in the right order. |
| */ |
| for (;;) { |
| xfs_fsblock_t nextbno; |
| xfs_extnum_t num_recs; |
| |
| |
| num_recs = xfs_btree_get_numrecs(block); |
| |
| /* |
| * Read-ahead the next leaf block, if any. |
| */ |
| |
| nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib); |
| |
| /* |
| * Check all the extents to make sure they are OK. |
| * If we had a previous block, the last entry should |
| * conform with the first entry in this one. |
| */ |
| |
| ep = XFS_BMBT_REC_ADDR(mp, block, 1); |
| if (i) { |
| ASSERT(xfs_bmbt_disk_get_startoff(&last) + |
| xfs_bmbt_disk_get_blockcount(&last) <= |
| xfs_bmbt_disk_get_startoff(ep)); |
| } |
| for (j = 1; j < num_recs; j++) { |
| nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1); |
| ASSERT(xfs_bmbt_disk_get_startoff(ep) + |
| xfs_bmbt_disk_get_blockcount(ep) <= |
| xfs_bmbt_disk_get_startoff(nextp)); |
| ep = nextp; |
| } |
| |
| last = *ep; |
| i += num_recs; |
| if (bp_release) { |
| bp_release = 0; |
| xfs_trans_brelse(NULL, bp); |
| } |
| bno = nextbno; |
| /* |
| * If we've reached the end, stop. |
| */ |
| if (bno == NULLFSBLOCK) |
| break; |
| |
| bp_release = 0; |
| bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno)); |
| if (!bp) { |
| bp_release = 1; |
| error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp, |
| XFS_BMAP_BTREE_REF, |
| &xfs_bmbt_buf_ops); |
| if (error) |
| goto error_norelse; |
| } |
| block = XFS_BUF_TO_BLOCK(bp); |
| } |
| |
| return; |
| |
| error0: |
| xfs_warn(mp, "%s: at error0", __func__); |
| if (bp_release) |
| xfs_trans_brelse(NULL, bp); |
| error_norelse: |
| xfs_warn(mp, "%s: BAD after btree leaves for %d extents", |
| __func__, i); |
| panic("%s: CORRUPTED BTREE OR SOMETHING", __func__); |
| return; |
| } |
| |
| /* |
| * Add bmap trace insert entries for all the contents of the extent records. |
| */ |
| void |
| xfs_bmap_trace_exlist( |
| xfs_inode_t *ip, /* incore inode pointer */ |
| xfs_extnum_t cnt, /* count of entries in the list */ |
| int whichfork, /* data or attr fork */ |
| unsigned long caller_ip) |
| { |
| xfs_extnum_t idx; /* extent record index */ |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| int state = 0; |
| |
| if (whichfork == XFS_ATTR_FORK) |
| state |= BMAP_ATTRFORK; |
| |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| ASSERT(cnt == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))); |
| for (idx = 0; idx < cnt; idx++) |
| trace_xfs_extlist(ip, idx, whichfork, caller_ip); |
| } |
| |
| /* |
| * Validate that the bmbt_irecs being returned from bmapi are valid |
| * given the caller's original parameters. Specifically check the |
| * ranges of the returned irecs to ensure that they only extend beyond |
| * the given parameters if the XFS_BMAPI_ENTIRE flag was set. |
| */ |
| STATIC void |
| xfs_bmap_validate_ret( |
| xfs_fileoff_t bno, |
| xfs_filblks_t len, |
| int flags, |
| xfs_bmbt_irec_t *mval, |
| int nmap, |
| int ret_nmap) |
| { |
| int i; /* index to map values */ |
| |
| ASSERT(ret_nmap <= nmap); |
| |
| for (i = 0; i < ret_nmap; i++) { |
| ASSERT(mval[i].br_blockcount > 0); |
| if (!(flags & XFS_BMAPI_ENTIRE)) { |
| ASSERT(mval[i].br_startoff >= bno); |
| ASSERT(mval[i].br_blockcount <= len); |
| ASSERT(mval[i].br_startoff + mval[i].br_blockcount <= |
| bno + len); |
| } else { |
| ASSERT(mval[i].br_startoff < bno + len); |
| ASSERT(mval[i].br_startoff + mval[i].br_blockcount > |
| bno); |
| } |
| ASSERT(i == 0 || |
| mval[i - 1].br_startoff + mval[i - 1].br_blockcount == |
| mval[i].br_startoff); |
| ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK && |
| mval[i].br_startblock != HOLESTARTBLOCK); |
| ASSERT(mval[i].br_state == XFS_EXT_NORM || |
| mval[i].br_state == XFS_EXT_UNWRITTEN); |
| } |
| } |
| |
| #else |
| #define xfs_bmap_check_leaf_extents(cur, ip, whichfork) do { } while (0) |
| #define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap) |
| #endif /* DEBUG */ |
| |
| /* |
| * bmap free list manipulation functions |
| */ |
| |
| /* |
| * Add the extent to the list of extents to be free at transaction end. |
| * The list is maintained sorted (by block number). |
| */ |
| void |
| xfs_bmap_add_free( |
| struct xfs_mount *mp, |
| struct xfs_defer_ops *dfops, |
| xfs_fsblock_t bno, |
| xfs_filblks_t len, |
| struct xfs_owner_info *oinfo) |
| { |
| struct xfs_extent_free_item *new; /* new element */ |
| #ifdef DEBUG |
| xfs_agnumber_t agno; |
| xfs_agblock_t agbno; |
| |
| ASSERT(bno != NULLFSBLOCK); |
| ASSERT(len > 0); |
| ASSERT(len <= MAXEXTLEN); |
| ASSERT(!isnullstartblock(bno)); |
| agno = XFS_FSB_TO_AGNO(mp, bno); |
| agbno = XFS_FSB_TO_AGBNO(mp, bno); |
| ASSERT(agno < mp->m_sb.sb_agcount); |
| ASSERT(agbno < mp->m_sb.sb_agblocks); |
| ASSERT(len < mp->m_sb.sb_agblocks); |
| ASSERT(agbno + len <= mp->m_sb.sb_agblocks); |
| #endif |
| ASSERT(xfs_bmap_free_item_zone != NULL); |
| |
| new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP); |
| new->xefi_startblock = bno; |
| new->xefi_blockcount = (xfs_extlen_t)len; |
| if (oinfo) |
| new->xefi_oinfo = *oinfo; |
| else |
| xfs_rmap_skip_owner_update(&new->xefi_oinfo); |
| trace_xfs_bmap_free_defer(mp, XFS_FSB_TO_AGNO(mp, bno), 0, |
| XFS_FSB_TO_AGBNO(mp, bno), len); |
| xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_FREE, &new->xefi_list); |
| } |
| |
| /* |
| * Inode fork format manipulation functions |
| */ |
| |
| /* |
| * Transform a btree format file with only one leaf node, where the |
| * extents list will fit in the inode, into an extents format file. |
| * Since the file extents are already in-core, all we have to do is |
| * give up the space for the btree root and pitch the leaf block. |
| */ |
| STATIC int /* error */ |
| xfs_bmap_btree_to_extents( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_inode_t *ip, /* incore inode pointer */ |
| xfs_btree_cur_t *cur, /* btree cursor */ |
| int *logflagsp, /* inode logging flags */ |
| int whichfork) /* data or attr fork */ |
| { |
| /* REFERENCED */ |
| struct xfs_btree_block *cblock;/* child btree block */ |
| xfs_fsblock_t cbno; /* child block number */ |
| xfs_buf_t *cbp; /* child block's buffer */ |
| int error; /* error return value */ |
| xfs_ifork_t *ifp; /* inode fork data */ |
| xfs_mount_t *mp; /* mount point structure */ |
| __be64 *pp; /* ptr to block address */ |
| struct xfs_btree_block *rblock;/* root btree block */ |
| struct xfs_owner_info oinfo; |
| |
| mp = ip->i_mount; |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| ASSERT(whichfork != XFS_COW_FORK); |
| ASSERT(ifp->if_flags & XFS_IFEXTENTS); |
| ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE); |
| rblock = ifp->if_broot; |
| ASSERT(be16_to_cpu(rblock->bb_level) == 1); |
| ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1); |
| ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1); |
| pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes); |
| cbno = be64_to_cpu(*pp); |
| *logflagsp = 0; |
| #ifdef DEBUG |
| if ((error = xfs_btree_check_lptr(cur, cbno, 1))) |
| return error; |
| #endif |
| error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp, XFS_BMAP_BTREE_REF, |
| &xfs_bmbt_buf_ops); |
| if (error) |
| return error; |
| cblock = XFS_BUF_TO_BLOCK(cbp); |
| if ((error = xfs_btree_check_block(cur, cblock, 0, cbp))) |
| return error; |
| xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork); |
| xfs_bmap_add_free(mp, cur->bc_private.b.dfops, cbno, 1, &oinfo); |
| ip->i_d.di_nblocks--; |
| xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L); |
| xfs_trans_binval(tp, cbp); |
| if (cur->bc_bufs[0] == cbp) |
| cur->bc_bufs[0] = NULL; |
| xfs_iroot_realloc(ip, -1, whichfork); |
| ASSERT(ifp->if_broot == NULL); |
| ASSERT((ifp->if_flags & XFS_IFBROOT) == 0); |
| XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS); |
| *logflagsp = XFS_ILOG_CORE | xfs_ilog_fext(whichfork); |
| return 0; |
| } |
| |
| /* |
| * Convert an extents-format file into a btree-format file. |
| * The new file will have a root block (in the inode) and a single child block. |
| */ |
| STATIC int /* error */ |
| xfs_bmap_extents_to_btree( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_inode_t *ip, /* incore inode pointer */ |
| xfs_fsblock_t *firstblock, /* first-block-allocated */ |
| struct xfs_defer_ops *dfops, /* blocks freed in xaction */ |
| xfs_btree_cur_t **curp, /* cursor returned to caller */ |
| int wasdel, /* converting a delayed alloc */ |
| int *logflagsp, /* inode logging flags */ |
| int whichfork) /* data or attr fork */ |
| { |
| struct xfs_btree_block *ablock; /* allocated (child) bt block */ |
| xfs_buf_t *abp; /* buffer for ablock */ |
| xfs_alloc_arg_t args; /* allocation arguments */ |
| xfs_bmbt_rec_t *arp; /* child record pointer */ |
| struct xfs_btree_block *block; /* btree root block */ |
| xfs_btree_cur_t *cur; /* bmap btree cursor */ |
| xfs_bmbt_rec_host_t *ep; /* extent record pointer */ |
| int error; /* error return value */ |
| xfs_extnum_t i, cnt; /* extent record index */ |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| xfs_bmbt_key_t *kp; /* root block key pointer */ |
| xfs_mount_t *mp; /* mount structure */ |
| xfs_extnum_t nextents; /* number of file extents */ |
| xfs_bmbt_ptr_t *pp; /* root block address pointer */ |
| |
| mp = ip->i_mount; |
| ASSERT(whichfork != XFS_COW_FORK); |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS); |
| |
| /* |
| * Make space in the inode incore. |
| */ |
| xfs_iroot_realloc(ip, 1, whichfork); |
| ifp->if_flags |= XFS_IFBROOT; |
| |
| /* |
| * Fill in the root. |
| */ |
| block = ifp->if_broot; |
| if (xfs_sb_version_hascrc(&mp->m_sb)) |
| xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL, |
| XFS_BMAP_CRC_MAGIC, 1, 1, ip->i_ino, |
| XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS); |
| else |
| xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL, |
| XFS_BMAP_MAGIC, 1, 1, ip->i_ino, |
| XFS_BTREE_LONG_PTRS); |
| |
| /* |
| * Need a cursor. Can't allocate until bb_level is filled in. |
| */ |
| cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); |
| cur->bc_private.b.firstblock = *firstblock; |
| cur->bc_private.b.dfops = dfops; |
| cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0; |
| /* |
| * Convert to a btree with two levels, one record in root. |
| */ |
| XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE); |
| memset(&args, 0, sizeof(args)); |
| args.tp = tp; |
| args.mp = mp; |
| xfs_rmap_ino_bmbt_owner(&args.oinfo, ip->i_ino, whichfork); |
| args.firstblock = *firstblock; |
| if (*firstblock == NULLFSBLOCK) { |
| args.type = XFS_ALLOCTYPE_START_BNO; |
| args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino); |
| } else if (dfops->dop_low) { |
| try_another_ag: |
| args.type = XFS_ALLOCTYPE_START_BNO; |
| args.fsbno = *firstblock; |
| } else { |
| args.type = XFS_ALLOCTYPE_NEAR_BNO; |
| args.fsbno = *firstblock; |
| } |
| args.minlen = args.maxlen = args.prod = 1; |
| args.wasdel = wasdel; |
| *logflagsp = 0; |
| if ((error = xfs_alloc_vextent(&args))) { |
| xfs_iroot_realloc(ip, -1, whichfork); |
| xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); |
| return error; |
| } |
| |
| /* |
| * During a CoW operation, the allocation and bmbt updates occur in |
| * different transactions. The mapping code tries to put new bmbt |
| * blocks near extents being mapped, but the only way to guarantee this |
| * is if the alloc and the mapping happen in a single transaction that |
| * has a block reservation. That isn't the case here, so if we run out |
| * of space we'll try again with another AG. |
| */ |
| if (xfs_sb_version_hasreflink(&cur->bc_mp->m_sb) && |
| args.fsbno == NULLFSBLOCK && |
| args.type == XFS_ALLOCTYPE_NEAR_BNO) { |
| dfops->dop_low = true; |
| goto try_another_ag; |
| } |
| /* |
| * Allocation can't fail, the space was reserved. |
| */ |
| ASSERT(args.fsbno != NULLFSBLOCK); |
| ASSERT(*firstblock == NULLFSBLOCK || |
| args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) || |
| (dfops->dop_low && |
| args.agno > XFS_FSB_TO_AGNO(mp, *firstblock))); |
| *firstblock = cur->bc_private.b.firstblock = args.fsbno; |
| cur->bc_private.b.allocated++; |
| ip->i_d.di_nblocks++; |
| xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L); |
| abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0); |
| /* |
| * Fill in the child block. |
| */ |
| abp->b_ops = &xfs_bmbt_buf_ops; |
| ablock = XFS_BUF_TO_BLOCK(abp); |
| if (xfs_sb_version_hascrc(&mp->m_sb)) |
| xfs_btree_init_block_int(mp, ablock, abp->b_bn, |
| XFS_BMAP_CRC_MAGIC, 0, 0, ip->i_ino, |
| XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS); |
| else |
| xfs_btree_init_block_int(mp, ablock, abp->b_bn, |
| XFS_BMAP_MAGIC, 0, 0, ip->i_ino, |
| XFS_BTREE_LONG_PTRS); |
| |
| arp = XFS_BMBT_REC_ADDR(mp, ablock, 1); |
| nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| for (cnt = i = 0; i < nextents; i++) { |
| ep = xfs_iext_get_ext(ifp, i); |
| if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) { |
| arp->l0 = cpu_to_be64(ep->l0); |
| arp->l1 = cpu_to_be64(ep->l1); |
| arp++; cnt++; |
| } |
| } |
| ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork)); |
| xfs_btree_set_numrecs(ablock, cnt); |
| |
| /* |
| * Fill in the root key and pointer. |
| */ |
| kp = XFS_BMBT_KEY_ADDR(mp, block, 1); |
| arp = XFS_BMBT_REC_ADDR(mp, ablock, 1); |
| kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp)); |
| pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur, |
| be16_to_cpu(block->bb_level))); |
| *pp = cpu_to_be64(args.fsbno); |
| |
| /* |
| * Do all this logging at the end so that |
| * the root is at the right level. |
| */ |
| xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS); |
| xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs)); |
| ASSERT(*curp == NULL); |
| *curp = cur; |
| *logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork); |
| return 0; |
| } |
| |
| /* |
| * Convert a local file to an extents file. |
| * This code is out of bounds for data forks of regular files, |
| * since the file data needs to get logged so things will stay consistent. |
| * (The bmap-level manipulations are ok, though). |
| */ |
| void |
| xfs_bmap_local_to_extents_empty( |
| struct xfs_inode *ip, |
| int whichfork) |
| { |
| struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); |
| |
| ASSERT(whichfork != XFS_COW_FORK); |
| ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL); |
| ASSERT(ifp->if_bytes == 0); |
| ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0); |
| |
| xfs_bmap_forkoff_reset(ip, whichfork); |
| ifp->if_flags &= ~XFS_IFINLINE; |
| ifp->if_flags |= XFS_IFEXTENTS; |
| XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS); |
| } |
| |
| |
| STATIC int /* error */ |
| xfs_bmap_local_to_extents( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_inode_t *ip, /* incore inode pointer */ |
| xfs_fsblock_t *firstblock, /* first block allocated in xaction */ |
| xfs_extlen_t total, /* total blocks needed by transaction */ |
| int *logflagsp, /* inode logging flags */ |
| int whichfork, |
| void (*init_fn)(struct xfs_trans *tp, |
| struct xfs_buf *bp, |
| struct xfs_inode *ip, |
| struct xfs_ifork *ifp)) |
| { |
| int error = 0; |
| int flags; /* logging flags returned */ |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| xfs_alloc_arg_t args; /* allocation arguments */ |
| xfs_buf_t *bp; /* buffer for extent block */ |
| xfs_bmbt_rec_host_t *ep; /* extent record pointer */ |
| |
| /* |
| * We don't want to deal with the case of keeping inode data inline yet. |
| * So sending the data fork of a regular inode is invalid. |
| */ |
| ASSERT(!(S_ISREG(VFS_I(ip)->i_mode) && whichfork == XFS_DATA_FORK)); |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL); |
| |
| if (!ifp->if_bytes) { |
| xfs_bmap_local_to_extents_empty(ip, whichfork); |
| flags = XFS_ILOG_CORE; |
| goto done; |
| } |
| |
| flags = 0; |
| error = 0; |
| ASSERT((ifp->if_flags & (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == |
| XFS_IFINLINE); |
| memset(&args, 0, sizeof(args)); |
| args.tp = tp; |
| args.mp = ip->i_mount; |
| xfs_rmap_ino_owner(&args.oinfo, ip->i_ino, whichfork, 0); |
| args.firstblock = *firstblock; |
| /* |
| * Allocate a block. We know we need only one, since the |
| * file currently fits in an inode. |
| */ |
| if (*firstblock == NULLFSBLOCK) { |
| try_another_ag: |
| args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino); |
| args.type = XFS_ALLOCTYPE_START_BNO; |
| } else { |
| args.fsbno = *firstblock; |
| args.type = XFS_ALLOCTYPE_NEAR_BNO; |
| } |
| args.total = total; |
| args.minlen = args.maxlen = args.prod = 1; |
| error = xfs_alloc_vextent(&args); |
| if (error) |
| goto done; |
| |
| /* |
| * During a CoW operation, the allocation and bmbt updates occur in |
| * different transactions. The mapping code tries to put new bmbt |
| * blocks near extents being mapped, but the only way to guarantee this |
| * is if the alloc and the mapping happen in a single transaction that |
| * has a block reservation. That isn't the case here, so if we run out |
| * of space we'll try again with another AG. |
| */ |
| if (xfs_sb_version_hasreflink(&ip->i_mount->m_sb) && |
| args.fsbno == NULLFSBLOCK && |
| args.type == XFS_ALLOCTYPE_NEAR_BNO) { |
| goto try_another_ag; |
| } |
| /* Can't fail, the space was reserved. */ |
| ASSERT(args.fsbno != NULLFSBLOCK); |
| ASSERT(args.len == 1); |
| *firstblock = args.fsbno; |
| bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0); |
| |
| /* |
| * Initialize the block, copy the data and log the remote buffer. |
| * |
| * The callout is responsible for logging because the remote format |
| * might differ from the local format and thus we don't know how much to |
| * log here. Note that init_fn must also set the buffer log item type |
| * correctly. |
| */ |
| init_fn(tp, bp, ip, ifp); |
| |
| /* account for the change in fork size */ |
| xfs_idata_realloc(ip, -ifp->if_bytes, whichfork); |
| xfs_bmap_local_to_extents_empty(ip, whichfork); |
| flags |= XFS_ILOG_CORE; |
| |
| xfs_iext_add(ifp, 0, 1); |
| ep = xfs_iext_get_ext(ifp, 0); |
| xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM); |
| trace_xfs_bmap_post_update(ip, 0, |
| whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0, |
| _THIS_IP_); |
| XFS_IFORK_NEXT_SET(ip, whichfork, 1); |
| ip->i_d.di_nblocks = 1; |
| xfs_trans_mod_dquot_byino(tp, ip, |
| XFS_TRANS_DQ_BCOUNT, 1L); |
| flags |= xfs_ilog_fext(whichfork); |
| |
| done: |
| *logflagsp = flags; |
| return error; |
| } |
| |
| /* |
| * Called from xfs_bmap_add_attrfork to handle btree format files. |
| */ |
| STATIC int /* error */ |
| xfs_bmap_add_attrfork_btree( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_inode_t *ip, /* incore inode pointer */ |
| xfs_fsblock_t *firstblock, /* first block allocated */ |
| struct xfs_defer_ops *dfops, /* blocks to free at commit */ |
| int *flags) /* inode logging flags */ |
| { |
| xfs_btree_cur_t *cur; /* btree cursor */ |
| int error; /* error return value */ |
| xfs_mount_t *mp; /* file system mount struct */ |
| int stat; /* newroot status */ |
| |
| mp = ip->i_mount; |
| if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip)) |
| *flags |= XFS_ILOG_DBROOT; |
| else { |
| cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK); |
| cur->bc_private.b.dfops = dfops; |
| cur->bc_private.b.firstblock = *firstblock; |
| if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat))) |
| goto error0; |
| /* must be at least one entry */ |
| XFS_WANT_CORRUPTED_GOTO(mp, stat == 1, error0); |
| if ((error = xfs_btree_new_iroot(cur, flags, &stat))) |
| goto error0; |
| if (stat == 0) { |
| xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); |
| return -ENOSPC; |
| } |
| *firstblock = cur->bc_private.b.firstblock; |
| cur->bc_private.b.allocated = 0; |
| xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR); |
| } |
| return 0; |
| error0: |
| xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); |
| return error; |
| } |
| |
| /* |
| * Called from xfs_bmap_add_attrfork to handle extents format files. |
| */ |
| STATIC int /* error */ |
| xfs_bmap_add_attrfork_extents( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_inode_t *ip, /* incore inode pointer */ |
| xfs_fsblock_t *firstblock, /* first block allocated */ |
| struct xfs_defer_ops *dfops, /* blocks to free at commit */ |
| int *flags) /* inode logging flags */ |
| { |
| xfs_btree_cur_t *cur; /* bmap btree cursor */ |
| int error; /* error return value */ |
| |
| if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip)) |
| return 0; |
| cur = NULL; |
| error = xfs_bmap_extents_to_btree(tp, ip, firstblock, dfops, &cur, 0, |
| flags, XFS_DATA_FORK); |
| if (cur) { |
| cur->bc_private.b.allocated = 0; |
| xfs_btree_del_cursor(cur, |
| error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); |
| } |
| return error; |
| } |
| |
| /* |
| * Called from xfs_bmap_add_attrfork to handle local format files. Each |
| * different data fork content type needs a different callout to do the |
| * conversion. Some are basic and only require special block initialisation |
| * callouts for the data formating, others (directories) are so specialised they |
| * handle everything themselves. |
| * |
| * XXX (dgc): investigate whether directory conversion can use the generic |
| * formatting callout. It should be possible - it's just a very complex |
| * formatter. |
| */ |
| STATIC int /* error */ |
| xfs_bmap_add_attrfork_local( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_inode_t *ip, /* incore inode pointer */ |
| xfs_fsblock_t *firstblock, /* first block allocated */ |
| struct xfs_defer_ops *dfops, /* blocks to free at commit */ |
| int *flags) /* inode logging flags */ |
| { |
| xfs_da_args_t dargs; /* args for dir/attr code */ |
| |
| if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip)) |
| return 0; |
| |
| if (S_ISDIR(VFS_I(ip)->i_mode)) { |
| memset(&dargs, 0, sizeof(dargs)); |
| dargs.geo = ip->i_mount->m_dir_geo; |
| dargs.dp = ip; |
| dargs.firstblock = firstblock; |
| dargs.dfops = dfops; |
| dargs.total = dargs.geo->fsbcount; |
| dargs.whichfork = XFS_DATA_FORK; |
| dargs.trans = tp; |
| return xfs_dir2_sf_to_block(&dargs); |
| } |
| |
| if (S_ISLNK(VFS_I(ip)->i_mode)) |
| return xfs_bmap_local_to_extents(tp, ip, firstblock, 1, |
| flags, XFS_DATA_FORK, |
| xfs_symlink_local_to_remote); |
| |
| /* should only be called for types that support local format data */ |
| ASSERT(0); |
| return -EFSCORRUPTED; |
| } |
| |
| /* |
| * Convert inode from non-attributed to attributed. |
| * Must not be in a transaction, ip must not be locked. |
| */ |
| int /* error code */ |
| xfs_bmap_add_attrfork( |
| xfs_inode_t *ip, /* incore inode pointer */ |
| int size, /* space new attribute needs */ |
| int rsvd) /* xact may use reserved blks */ |
| { |
| xfs_fsblock_t firstblock; /* 1st block/ag allocated */ |
| struct xfs_defer_ops dfops; /* freed extent records */ |
| xfs_mount_t *mp; /* mount structure */ |
| xfs_trans_t *tp; /* transaction pointer */ |
| int blks; /* space reservation */ |
| int version = 1; /* superblock attr version */ |
| int logflags; /* logging flags */ |
| int error; /* error return value */ |
| |
| ASSERT(XFS_IFORK_Q(ip) == 0); |
| |
| mp = ip->i_mount; |
| ASSERT(!XFS_NOT_DQATTACHED(mp, ip)); |
| |
| blks = XFS_ADDAFORK_SPACE_RES(mp); |
| |
| error = xfs_trans_alloc(mp, &M_RES(mp)->tr_addafork, blks, 0, |
| rsvd ? XFS_TRANS_RESERVE : 0, &tp); |
| if (error) |
| return error; |
| |
| xfs_ilock(ip, XFS_ILOCK_EXCL); |
| error = xfs_trans_reserve_quota_nblks(tp, ip, blks, 0, rsvd ? |
| XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES : |
| XFS_QMOPT_RES_REGBLKS); |
| if (error) |
| goto trans_cancel; |
| if (XFS_IFORK_Q(ip)) |
| goto trans_cancel; |
| if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) { |
| /* |
| * For inodes coming from pre-6.2 filesystems. |
| */ |
| ASSERT(ip->i_d.di_aformat == 0); |
| ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS; |
| } |
| ASSERT(ip->i_d.di_anextents == 0); |
| |
| xfs_trans_ijoin(tp, ip, 0); |
| xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| |
| switch (ip->i_d.di_format) { |
| case XFS_DINODE_FMT_DEV: |
| ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3; |
| break; |
| case XFS_DINODE_FMT_UUID: |
| ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3; |
| break; |
| case XFS_DINODE_FMT_LOCAL: |
| case XFS_DINODE_FMT_EXTENTS: |
| case XFS_DINODE_FMT_BTREE: |
| ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size); |
| if (!ip->i_d.di_forkoff) |
| ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3; |
| else if (mp->m_flags & XFS_MOUNT_ATTR2) |
| version = 2; |
| break; |
| default: |
| ASSERT(0); |
| error = -EINVAL; |
| goto trans_cancel; |
| } |
| |
| ASSERT(ip->i_afp == NULL); |
| ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP); |
| ip->i_afp->if_flags = XFS_IFEXTENTS; |
| logflags = 0; |
| xfs_defer_init(&dfops, &firstblock); |
| switch (ip->i_d.di_format) { |
| case XFS_DINODE_FMT_LOCAL: |
| error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &dfops, |
| &logflags); |
| break; |
| case XFS_DINODE_FMT_EXTENTS: |
| error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock, |
| &dfops, &logflags); |
| break; |
| case XFS_DINODE_FMT_BTREE: |
| error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &dfops, |
| &logflags); |
| break; |
| default: |
| error = 0; |
| break; |
| } |
| if (logflags) |
| xfs_trans_log_inode(tp, ip, logflags); |
| if (error) |
| goto bmap_cancel; |
| if (!xfs_sb_version_hasattr(&mp->m_sb) || |
| (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2)) { |
| bool log_sb = false; |
| |
| spin_lock(&mp->m_sb_lock); |
| if (!xfs_sb_version_hasattr(&mp->m_sb)) { |
| xfs_sb_version_addattr(&mp->m_sb); |
| log_sb = true; |
| } |
| if (!xfs_sb_version_hasattr2(&mp->m_sb) && version == 2) { |
| xfs_sb_version_addattr2(&mp->m_sb); |
| log_sb = true; |
| } |
| spin_unlock(&mp->m_sb_lock); |
| if (log_sb) |
| xfs_log_sb(tp); |
| } |
| |
| error = xfs_defer_finish(&tp, &dfops, NULL); |
| if (error) |
| goto bmap_cancel; |
| error = xfs_trans_commit(tp); |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| return error; |
| |
| bmap_cancel: |
| xfs_defer_cancel(&dfops); |
| trans_cancel: |
| xfs_trans_cancel(tp); |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| return error; |
| } |
| |
| /* |
| * Internal and external extent tree search functions. |
| */ |
| |
| /* |
| * Read in the extents to if_extents. |
| * All inode fields are set up by caller, we just traverse the btree |
| * and copy the records in. If the file system cannot contain unwritten |
| * extents, the records are checked for no "state" flags. |
| */ |
| int /* error */ |
| xfs_bmap_read_extents( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_inode_t *ip, /* incore inode */ |
| int whichfork) /* data or attr fork */ |
| { |
| struct xfs_btree_block *block; /* current btree block */ |
| xfs_fsblock_t bno; /* block # of "block" */ |
| xfs_buf_t *bp; /* buffer for "block" */ |
| int error; /* error return value */ |
| xfs_exntfmt_t exntf; /* XFS_EXTFMT_NOSTATE, if checking */ |
| xfs_extnum_t i, j; /* index into the extents list */ |
| xfs_ifork_t *ifp; /* fork structure */ |
| int level; /* btree level, for checking */ |
| xfs_mount_t *mp; /* file system mount structure */ |
| __be64 *pp; /* pointer to block address */ |
| /* REFERENCED */ |
| xfs_extnum_t room; /* number of entries there's room for */ |
| |
| bno = NULLFSBLOCK; |
| mp = ip->i_mount; |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE : |
| XFS_EXTFMT_INODE(ip); |
| block = ifp->if_broot; |
| /* |
| * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out. |
| */ |
| level = be16_to_cpu(block->bb_level); |
| ASSERT(level > 0); |
| pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes); |
| bno = be64_to_cpu(*pp); |
| ASSERT(bno != NULLFSBLOCK); |
| ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount); |
| ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks); |
| /* |
| * Go down the tree until leaf level is reached, following the first |
| * pointer (leftmost) at each level. |
| */ |
| while (level-- > 0) { |
| error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, |
| XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops); |
| if (error) |
| return error; |
| block = XFS_BUF_TO_BLOCK(bp); |
| if (level == 0) |
| break; |
| pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]); |
| bno = be64_to_cpu(*pp); |
| XFS_WANT_CORRUPTED_GOTO(mp, |
| XFS_FSB_SANITY_CHECK(mp, bno), error0); |
| xfs_trans_brelse(tp, bp); |
| } |
| /* |
| * Here with bp and block set to the leftmost leaf node in the tree. |
| */ |
| room = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| i = 0; |
| /* |
| * Loop over all leaf nodes. Copy information to the extent records. |
| */ |
| for (;;) { |
| xfs_bmbt_rec_t *frp; |
| xfs_fsblock_t nextbno; |
| xfs_extnum_t num_recs; |
| xfs_extnum_t start; |
| |
| num_recs = xfs_btree_get_numrecs(block); |
| if (unlikely(i + num_recs > room)) { |
| ASSERT(i + num_recs <= room); |
| xfs_warn(ip->i_mount, |
| "corrupt dinode %Lu, (btree extents).", |
| (unsigned long long) ip->i_ino); |
| XFS_CORRUPTION_ERROR("xfs_bmap_read_extents(1)", |
| XFS_ERRLEVEL_LOW, ip->i_mount, block); |
| goto error0; |
| } |
| /* |
| * Read-ahead the next leaf block, if any. |
| */ |
| nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib); |
| if (nextbno != NULLFSBLOCK) |
| xfs_btree_reada_bufl(mp, nextbno, 1, |
| &xfs_bmbt_buf_ops); |
| /* |
| * Copy records into the extent records. |
| */ |
| frp = XFS_BMBT_REC_ADDR(mp, block, 1); |
| start = i; |
| for (j = 0; j < num_recs; j++, i++, frp++) { |
| xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i); |
| trp->l0 = be64_to_cpu(frp->l0); |
| trp->l1 = be64_to_cpu(frp->l1); |
| } |
| if (exntf == XFS_EXTFMT_NOSTATE) { |
| /* |
| * Check all attribute bmap btree records and |
| * any "older" data bmap btree records for a |
| * set bit in the "extent flag" position. |
| */ |
| if (unlikely(xfs_check_nostate_extents(ifp, |
| start, num_recs))) { |
| XFS_ERROR_REPORT("xfs_bmap_read_extents(2)", |
| XFS_ERRLEVEL_LOW, |
| ip->i_mount); |
| goto error0; |
| } |
| } |
| xfs_trans_brelse(tp, bp); |
| bno = nextbno; |
| /* |
| * If we've reached the end, stop. |
| */ |
| if (bno == NULLFSBLOCK) |
| break; |
| error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, |
| XFS_BMAP_BTREE_REF, &xfs_bmbt_buf_ops); |
| if (error) |
| return error; |
| block = XFS_BUF_TO_BLOCK(bp); |
| } |
| ASSERT(i == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))); |
| ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork)); |
| XFS_BMAP_TRACE_EXLIST(ip, i, whichfork); |
| return 0; |
| error0: |
| xfs_trans_brelse(tp, bp); |
| return -EFSCORRUPTED; |
| } |
| |
| |
| /* |
| * Search the extent records for the entry containing block bno. |
| * If bno lies in a hole, point to the next entry. If bno lies |
| * past eof, *eofp will be set, and *prevp will contain the last |
| * entry (null if none). Else, *lastxp will be set to the index |
| * of the found entry; *gotp will contain the entry. |
| */ |
| STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */ |
| xfs_bmap_search_multi_extents( |
| xfs_ifork_t *ifp, /* inode fork pointer */ |
| xfs_fileoff_t bno, /* block number searched for */ |
| int *eofp, /* out: end of file found */ |
| xfs_extnum_t *lastxp, /* out: last extent index */ |
| xfs_bmbt_irec_t *gotp, /* out: extent entry found */ |
| xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */ |
| { |
| xfs_bmbt_rec_host_t *ep; /* extent record pointer */ |
| xfs_extnum_t lastx; /* last extent index */ |
| |
| /* |
| * Initialize the extent entry structure to catch access to |
| * uninitialized br_startblock field. |
| */ |
| gotp->br_startoff = 0xffa5a5a5a5a5a5a5LL; |
| gotp->br_blockcount = 0xa55a5a5a5a5a5a5aLL; |
| gotp->br_state = XFS_EXT_INVALID; |
| gotp->br_startblock = 0xffffa5a5a5a5a5a5LL; |
| prevp->br_startoff = NULLFILEOFF; |
| |
| ep = xfs_iext_bno_to_ext(ifp, bno, &lastx); |
| if (lastx > 0) { |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx - 1), prevp); |
| } |
| if (lastx < (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) { |
| xfs_bmbt_get_all(ep, gotp); |
| *eofp = 0; |
| } else { |
| if (lastx > 0) { |
| *gotp = *prevp; |
| } |
| *eofp = 1; |
| ep = NULL; |
| } |
| *lastxp = lastx; |
| return ep; |
| } |
| |
| /* |
| * Search the extents list for the inode, for the extent containing bno. |
| * If bno lies in a hole, point to the next entry. If bno lies past eof, |
| * *eofp will be set, and *prevp will contain the last entry (null if none). |
| * Else, *lastxp will be set to the index of the found |
| * entry; *gotp will contain the entry. |
| */ |
| xfs_bmbt_rec_host_t * /* pointer to found extent entry */ |
| xfs_bmap_search_extents( |
| xfs_inode_t *ip, /* incore inode pointer */ |
| xfs_fileoff_t bno, /* block number searched for */ |
| int fork, /* data or attr fork */ |
| int *eofp, /* out: end of file found */ |
| xfs_extnum_t *lastxp, /* out: last extent index */ |
| xfs_bmbt_irec_t *gotp, /* out: extent entry found */ |
| xfs_bmbt_irec_t *prevp) /* out: previous extent entry found */ |
| { |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| xfs_bmbt_rec_host_t *ep; /* extent record pointer */ |
| |
| XFS_STATS_INC(ip->i_mount, xs_look_exlist); |
| ifp = XFS_IFORK_PTR(ip, fork); |
| |
| ep = xfs_bmap_search_multi_extents(ifp, bno, eofp, lastxp, gotp, prevp); |
| |
| if (unlikely(!(gotp->br_startblock) && (*lastxp != NULLEXTNUM) && |
| !(XFS_IS_REALTIME_INODE(ip) && fork == XFS_DATA_FORK))) { |
| xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO, |
| "Access to block zero in inode %llu " |
| "start_block: %llx start_off: %llx " |
| "blkcnt: %llx extent-state: %x lastx: %x", |
| (unsigned long long)ip->i_ino, |
| (unsigned long long)gotp->br_startblock, |
| (unsigned long long)gotp->br_startoff, |
| (unsigned long long)gotp->br_blockcount, |
| gotp->br_state, *lastxp); |
| *lastxp = NULLEXTNUM; |
| *eofp = 1; |
| return NULL; |
| } |
| return ep; |
| } |
| |
| /* |
| * Returns the file-relative block number of the first unused block(s) |
| * in the file with at least "len" logically contiguous blocks free. |
| * This is the lowest-address hole if the file has holes, else the first block |
| * past the end of file. |
| * Return 0 if the file is currently local (in-inode). |
| */ |
| int /* error */ |
| xfs_bmap_first_unused( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_inode_t *ip, /* incore inode */ |
| xfs_extlen_t len, /* size of hole to find */ |
| xfs_fileoff_t *first_unused, /* unused block */ |
| int whichfork) /* data or attr fork */ |
| { |
| int error; /* error return value */ |
| int idx; /* extent record index */ |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| xfs_fileoff_t lastaddr; /* last block number seen */ |
| xfs_fileoff_t lowest; /* lowest useful block */ |
| xfs_fileoff_t max; /* starting useful block */ |
| xfs_fileoff_t off; /* offset for this block */ |
| xfs_extnum_t nextents; /* number of extent entries */ |
| |
| ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE || |
| XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS || |
| XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL); |
| if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) { |
| *first_unused = 0; |
| return 0; |
| } |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| if (!(ifp->if_flags & XFS_IFEXTENTS) && |
| (error = xfs_iread_extents(tp, ip, whichfork))) |
| return error; |
| lowest = *first_unused; |
| nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| for (idx = 0, lastaddr = 0, max = lowest; idx < nextents; idx++) { |
| xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx); |
| off = xfs_bmbt_get_startoff(ep); |
| /* |
| * See if the hole before this extent will work. |
| */ |
| if (off >= lowest + len && off - max >= len) { |
| *first_unused = max; |
| return 0; |
| } |
| lastaddr = off + xfs_bmbt_get_blockcount(ep); |
| max = XFS_FILEOFF_MAX(lastaddr, lowest); |
| } |
| *first_unused = max; |
| return 0; |
| } |
| |
| /* |
| * Returns the file-relative block number of the last block - 1 before |
| * last_block (input value) in the file. |
| * This is not based on i_size, it is based on the extent records. |
| * Returns 0 for local files, as they do not have extent records. |
| */ |
| int /* error */ |
| xfs_bmap_last_before( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_inode_t *ip, /* incore inode */ |
| xfs_fileoff_t *last_block, /* last block */ |
| int whichfork) /* data or attr fork */ |
| { |
| xfs_fileoff_t bno; /* input file offset */ |
| int eof; /* hit end of file */ |
| xfs_bmbt_rec_host_t *ep; /* pointer to last extent */ |
| int error; /* error return value */ |
| xfs_bmbt_irec_t got; /* current extent value */ |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| xfs_extnum_t lastx; /* last extent used */ |
| xfs_bmbt_irec_t prev; /* previous extent value */ |
| |
| if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL) |
| return -EIO; |
| if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) { |
| *last_block = 0; |
| return 0; |
| } |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| if (!(ifp->if_flags & XFS_IFEXTENTS) && |
| (error = xfs_iread_extents(tp, ip, whichfork))) |
| return error; |
| bno = *last_block - 1; |
| ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got, |
| &prev); |
| if (eof || xfs_bmbt_get_startoff(ep) > bno) { |
| if (prev.br_startoff == NULLFILEOFF) |
| *last_block = 0; |
| else |
| *last_block = prev.br_startoff + prev.br_blockcount; |
| } |
| /* |
| * Otherwise *last_block is already the right answer. |
| */ |
| return 0; |
| } |
| |
| int |
| xfs_bmap_last_extent( |
| struct xfs_trans *tp, |
| struct xfs_inode *ip, |
| int whichfork, |
| struct xfs_bmbt_irec *rec, |
| int *is_empty) |
| { |
| struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); |
| int error; |
| int nextents; |
| |
| if (!(ifp->if_flags & XFS_IFEXTENTS)) { |
| error = xfs_iread_extents(tp, ip, whichfork); |
| if (error) |
| return error; |
| } |
| |
| nextents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t); |
| if (nextents == 0) { |
| *is_empty = 1; |
| return 0; |
| } |
| |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, nextents - 1), rec); |
| *is_empty = 0; |
| return 0; |
| } |
| |
| /* |
| * Check the last inode extent to determine whether this allocation will result |
| * in blocks being allocated at the end of the file. When we allocate new data |
| * blocks at the end of the file which do not start at the previous data block, |
| * we will try to align the new blocks at stripe unit boundaries. |
| * |
| * Returns 1 in bma->aeof if the file (fork) is empty as any new write will be |
| * at, or past the EOF. |
| */ |
| STATIC int |
| xfs_bmap_isaeof( |
| struct xfs_bmalloca *bma, |
| int whichfork) |
| { |
| struct xfs_bmbt_irec rec; |
| int is_empty; |
| int error; |
| |
| bma->aeof = 0; |
| error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec, |
| &is_empty); |
| if (error) |
| return error; |
| |
| if (is_empty) { |
| bma->aeof = 1; |
| return 0; |
| } |
| |
| /* |
| * Check if we are allocation or past the last extent, or at least into |
| * the last delayed allocated extent. |
| */ |
| bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount || |
| (bma->offset >= rec.br_startoff && |
| isnullstartblock(rec.br_startblock)); |
| return 0; |
| } |
| |
| /* |
| * Returns the file-relative block number of the first block past eof in |
| * the file. This is not based on i_size, it is based on the extent records. |
| * Returns 0 for local files, as they do not have extent records. |
| */ |
| int |
| xfs_bmap_last_offset( |
| struct xfs_inode *ip, |
| xfs_fileoff_t *last_block, |
| int whichfork) |
| { |
| struct xfs_bmbt_irec rec; |
| int is_empty; |
| int error; |
| |
| *last_block = 0; |
| |
| if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) |
| return 0; |
| |
| if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS) |
| return -EIO; |
| |
| error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty); |
| if (error || is_empty) |
| return error; |
| |
| *last_block = rec.br_startoff + rec.br_blockcount; |
| return 0; |
| } |
| |
| /* |
| * Returns whether the selected fork of the inode has exactly one |
| * block or not. For the data fork we check this matches di_size, |
| * implying the file's range is 0..bsize-1. |
| */ |
| int /* 1=>1 block, 0=>otherwise */ |
| xfs_bmap_one_block( |
| xfs_inode_t *ip, /* incore inode */ |
| int whichfork) /* data or attr fork */ |
| { |
| xfs_bmbt_rec_host_t *ep; /* ptr to fork's extent */ |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| int rval; /* return value */ |
| xfs_bmbt_irec_t s; /* internal version of extent */ |
| |
| #ifndef DEBUG |
| if (whichfork == XFS_DATA_FORK) |
| return XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize; |
| #endif /* !DEBUG */ |
| if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1) |
| return 0; |
| if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS) |
| return 0; |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| ASSERT(ifp->if_flags & XFS_IFEXTENTS); |
| ep = xfs_iext_get_ext(ifp, 0); |
| xfs_bmbt_get_all(ep, &s); |
| rval = s.br_startoff == 0 && s.br_blockcount == 1; |
| if (rval && whichfork == XFS_DATA_FORK) |
| ASSERT(XFS_ISIZE(ip) == ip->i_mount->m_sb.sb_blocksize); |
| return rval; |
| } |
| |
| /* |
| * Extent tree manipulation functions used during allocation. |
| */ |
| |
| /* |
| * Convert a delayed allocation to a real allocation. |
| */ |
| STATIC int /* error */ |
| xfs_bmap_add_extent_delay_real( |
| struct xfs_bmalloca *bma, |
| int whichfork) |
| { |
| struct xfs_bmbt_irec *new = &bma->got; |
| int diff; /* temp value */ |
| xfs_bmbt_rec_host_t *ep; /* extent entry for idx */ |
| int error; /* error return value */ |
| int i; /* temp state */ |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| xfs_fileoff_t new_endoff; /* end offset of new entry */ |
| xfs_bmbt_irec_t r[3]; /* neighbor extent entries */ |
| /* left is 0, right is 1, prev is 2 */ |
| int rval=0; /* return value (logging flags) */ |
| int state = 0;/* state bits, accessed thru macros */ |
| xfs_filblks_t da_new; /* new count del alloc blocks used */ |
| xfs_filblks_t da_old; /* old count del alloc blocks used */ |
| xfs_filblks_t temp=0; /* value for da_new calculations */ |
| xfs_filblks_t temp2=0;/* value for da_new calculations */ |
| int tmp_rval; /* partial logging flags */ |
| struct xfs_mount *mp; |
| xfs_extnum_t *nextents; |
| |
| mp = bma->ip->i_mount; |
| ifp = XFS_IFORK_PTR(bma->ip, whichfork); |
| ASSERT(whichfork != XFS_ATTR_FORK); |
| nextents = (whichfork == XFS_COW_FORK ? &bma->ip->i_cnextents : |
| &bma->ip->i_d.di_nextents); |
| |
| ASSERT(bma->idx >= 0); |
| ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec)); |
| ASSERT(!isnullstartblock(new->br_startblock)); |
| ASSERT(!bma->cur || |
| (bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL)); |
| |
| XFS_STATS_INC(mp, xs_add_exlist); |
| |
| #define LEFT r[0] |
| #define RIGHT r[1] |
| #define PREV r[2] |
| |
| if (whichfork == XFS_COW_FORK) |
| state |= BMAP_COWFORK; |
| |
| /* |
| * Set up a bunch of variables to make the tests simpler. |
| */ |
| ep = xfs_iext_get_ext(ifp, bma->idx); |
| xfs_bmbt_get_all(ep, &PREV); |
| new_endoff = new->br_startoff + new->br_blockcount; |
| ASSERT(PREV.br_startoff <= new->br_startoff); |
| ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff); |
| |
| da_old = startblockval(PREV.br_startblock); |
| da_new = 0; |
| |
| /* |
| * Set flags determining what part of the previous delayed allocation |
| * extent is being replaced by a real allocation. |
| */ |
| if (PREV.br_startoff == new->br_startoff) |
| state |= BMAP_LEFT_FILLING; |
| if (PREV.br_startoff + PREV.br_blockcount == new_endoff) |
| state |= BMAP_RIGHT_FILLING; |
| |
| /* |
| * Check and set flags if this segment has a left neighbor. |
| * Don't set contiguous if the combined extent would be too large. |
| */ |
| if (bma->idx > 0) { |
| state |= BMAP_LEFT_VALID; |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &LEFT); |
| |
| if (isnullstartblock(LEFT.br_startblock)) |
| state |= BMAP_LEFT_DELAY; |
| } |
| |
| if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) && |
| LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff && |
| LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock && |
| LEFT.br_state == new->br_state && |
| LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN) |
| state |= BMAP_LEFT_CONTIG; |
| |
| /* |
| * Check and set flags if this segment has a right neighbor. |
| * Don't set contiguous if the combined extent would be too large. |
| * Also check for all-three-contiguous being too large. |
| */ |
| if (bma->idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) { |
| state |= BMAP_RIGHT_VALID; |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx + 1), &RIGHT); |
| |
| if (isnullstartblock(RIGHT.br_startblock)) |
| state |= BMAP_RIGHT_DELAY; |
| } |
| |
| if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) && |
| new_endoff == RIGHT.br_startoff && |
| new->br_startblock + new->br_blockcount == RIGHT.br_startblock && |
| new->br_state == RIGHT.br_state && |
| new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN && |
| ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING | |
| BMAP_RIGHT_FILLING)) != |
| (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING | |
| BMAP_RIGHT_FILLING) || |
| LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount |
| <= MAXEXTLEN)) |
| state |= BMAP_RIGHT_CONTIG; |
| |
| error = 0; |
| /* |
| * Switch out based on the FILLING and CONTIG state bits. |
| */ |
| switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | |
| BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) { |
| case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | |
| BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: |
| /* |
| * Filling in all of a previously delayed allocation extent. |
| * The left and right neighbors are both contiguous with new. |
| */ |
| bma->idx--; |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx), |
| LEFT.br_blockcount + PREV.br_blockcount + |
| RIGHT.br_blockcount); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); |
| |
| xfs_iext_remove(bma->ip, bma->idx + 1, 2, state); |
| (*nextents)--; |
| if (bma->cur == NULL) |
| rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; |
| else { |
| rval = XFS_ILOG_CORE; |
| error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff, |
| RIGHT.br_startblock, |
| RIGHT.br_blockcount, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_btree_delete(bma->cur, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_btree_decrement(bma->cur, 0, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_bmbt_update(bma->cur, LEFT.br_startoff, |
| LEFT.br_startblock, |
| LEFT.br_blockcount + |
| PREV.br_blockcount + |
| RIGHT.br_blockcount, LEFT.br_state); |
| if (error) |
| goto done; |
| } |
| break; |
| |
| case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG: |
| /* |
| * Filling in all of a previously delayed allocation extent. |
| * The left neighbor is contiguous, the right is not. |
| */ |
| bma->idx--; |
| |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx), |
| LEFT.br_blockcount + PREV.br_blockcount); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); |
| |
| xfs_iext_remove(bma->ip, bma->idx + 1, 1, state); |
| if (bma->cur == NULL) |
| rval = XFS_ILOG_DEXT; |
| else { |
| rval = 0; |
| error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff, |
| LEFT.br_startblock, LEFT.br_blockcount, |
| &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_bmbt_update(bma->cur, LEFT.br_startoff, |
| LEFT.br_startblock, |
| LEFT.br_blockcount + |
| PREV.br_blockcount, LEFT.br_state); |
| if (error) |
| goto done; |
| } |
| break; |
| |
| case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: |
| /* |
| * Filling in all of a previously delayed allocation extent. |
| * The right neighbor is contiguous, the left is not. |
| */ |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); |
| xfs_bmbt_set_startblock(ep, new->br_startblock); |
| xfs_bmbt_set_blockcount(ep, |
| PREV.br_blockcount + RIGHT.br_blockcount); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); |
| |
| xfs_iext_remove(bma->ip, bma->idx + 1, 1, state); |
| if (bma->cur == NULL) |
| rval = XFS_ILOG_DEXT; |
| else { |
| rval = 0; |
| error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff, |
| RIGHT.br_startblock, |
| RIGHT.br_blockcount, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_bmbt_update(bma->cur, PREV.br_startoff, |
| new->br_startblock, |
| PREV.br_blockcount + |
| RIGHT.br_blockcount, PREV.br_state); |
| if (error) |
| goto done; |
| } |
| break; |
| |
| case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING: |
| /* |
| * Filling in all of a previously delayed allocation extent. |
| * Neither the left nor right neighbors are contiguous with |
| * the new one. |
| */ |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); |
| xfs_bmbt_set_startblock(ep, new->br_startblock); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); |
| |
| (*nextents)++; |
| if (bma->cur == NULL) |
| rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; |
| else { |
| rval = XFS_ILOG_CORE; |
| error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff, |
| new->br_startblock, new->br_blockcount, |
| &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done); |
| bma->cur->bc_rec.b.br_state = XFS_EXT_NORM; |
| error = xfs_btree_insert(bma->cur, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| } |
| break; |
| |
| case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG: |
| /* |
| * Filling in the first part of a previous delayed allocation. |
| * The left neighbor is contiguous. |
| */ |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx - 1, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx - 1), |
| LEFT.br_blockcount + new->br_blockcount); |
| xfs_bmbt_set_startoff(ep, |
| PREV.br_startoff + new->br_blockcount); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx - 1, state, _THIS_IP_); |
| |
| temp = PREV.br_blockcount - new->br_blockcount; |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(ep, temp); |
| if (bma->cur == NULL) |
| rval = XFS_ILOG_DEXT; |
| else { |
| rval = 0; |
| error = xfs_bmbt_lookup_eq(bma->cur, LEFT.br_startoff, |
| LEFT.br_startblock, LEFT.br_blockcount, |
| &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_bmbt_update(bma->cur, LEFT.br_startoff, |
| LEFT.br_startblock, |
| LEFT.br_blockcount + |
| new->br_blockcount, |
| LEFT.br_state); |
| if (error) |
| goto done; |
| } |
| da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp), |
| startblockval(PREV.br_startblock)); |
| xfs_bmbt_set_startblock(ep, nullstartblock(da_new)); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); |
| |
| bma->idx--; |
| break; |
| |
| case BMAP_LEFT_FILLING: |
| /* |
| * Filling in the first part of a previous delayed allocation. |
| * The left neighbor is not contiguous. |
| */ |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); |
| xfs_bmbt_set_startoff(ep, new_endoff); |
| temp = PREV.br_blockcount - new->br_blockcount; |
| xfs_bmbt_set_blockcount(ep, temp); |
| xfs_iext_insert(bma->ip, bma->idx, 1, new, state); |
| (*nextents)++; |
| if (bma->cur == NULL) |
| rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; |
| else { |
| rval = XFS_ILOG_CORE; |
| error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff, |
| new->br_startblock, new->br_blockcount, |
| &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done); |
| bma->cur->bc_rec.b.br_state = XFS_EXT_NORM; |
| error = xfs_btree_insert(bma->cur, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| } |
| |
| if (xfs_bmap_needs_btree(bma->ip, whichfork)) { |
| error = xfs_bmap_extents_to_btree(bma->tp, bma->ip, |
| bma->firstblock, bma->dfops, |
| &bma->cur, 1, &tmp_rval, whichfork); |
| rval |= tmp_rval; |
| if (error) |
| goto done; |
| } |
| da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp), |
| startblockval(PREV.br_startblock) - |
| (bma->cur ? bma->cur->bc_private.b.allocated : 0)); |
| ep = xfs_iext_get_ext(ifp, bma->idx + 1); |
| xfs_bmbt_set_startblock(ep, nullstartblock(da_new)); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_); |
| break; |
| |
| case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: |
| /* |
| * Filling in the last part of a previous delayed allocation. |
| * The right neighbor is contiguous with the new allocation. |
| */ |
| temp = PREV.br_blockcount - new->br_blockcount; |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx + 1, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(ep, temp); |
| xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx + 1), |
| new->br_startoff, new->br_startblock, |
| new->br_blockcount + RIGHT.br_blockcount, |
| RIGHT.br_state); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx + 1, state, _THIS_IP_); |
| if (bma->cur == NULL) |
| rval = XFS_ILOG_DEXT; |
| else { |
| rval = 0; |
| error = xfs_bmbt_lookup_eq(bma->cur, RIGHT.br_startoff, |
| RIGHT.br_startblock, |
| RIGHT.br_blockcount, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_bmbt_update(bma->cur, new->br_startoff, |
| new->br_startblock, |
| new->br_blockcount + |
| RIGHT.br_blockcount, |
| RIGHT.br_state); |
| if (error) |
| goto done; |
| } |
| |
| da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp), |
| startblockval(PREV.br_startblock)); |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); |
| xfs_bmbt_set_startblock(ep, nullstartblock(da_new)); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); |
| |
| bma->idx++; |
| break; |
| |
| case BMAP_RIGHT_FILLING: |
| /* |
| * Filling in the last part of a previous delayed allocation. |
| * The right neighbor is not contiguous. |
| */ |
| temp = PREV.br_blockcount - new->br_blockcount; |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(ep, temp); |
| xfs_iext_insert(bma->ip, bma->idx + 1, 1, new, state); |
| (*nextents)++; |
| if (bma->cur == NULL) |
| rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; |
| else { |
| rval = XFS_ILOG_CORE; |
| error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff, |
| new->br_startblock, new->br_blockcount, |
| &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done); |
| bma->cur->bc_rec.b.br_state = XFS_EXT_NORM; |
| error = xfs_btree_insert(bma->cur, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| } |
| |
| if (xfs_bmap_needs_btree(bma->ip, whichfork)) { |
| error = xfs_bmap_extents_to_btree(bma->tp, bma->ip, |
| bma->firstblock, bma->dfops, &bma->cur, 1, |
| &tmp_rval, whichfork); |
| rval |= tmp_rval; |
| if (error) |
| goto done; |
| } |
| da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp), |
| startblockval(PREV.br_startblock) - |
| (bma->cur ? bma->cur->bc_private.b.allocated : 0)); |
| ep = xfs_iext_get_ext(ifp, bma->idx); |
| xfs_bmbt_set_startblock(ep, nullstartblock(da_new)); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); |
| |
| bma->idx++; |
| break; |
| |
| case 0: |
| /* |
| * Filling in the middle part of a previous delayed allocation. |
| * Contiguity is impossible here. |
| * This case is avoided almost all the time. |
| * |
| * We start with a delayed allocation: |
| * |
| * +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+ |
| * PREV @ idx |
| * |
| * and we are allocating: |
| * +rrrrrrrrrrrrrrrrr+ |
| * new |
| * |
| * and we set it up for insertion as: |
| * +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+ |
| * new |
| * PREV @ idx LEFT RIGHT |
| * inserted at idx + 1 |
| */ |
| temp = new->br_startoff - PREV.br_startoff; |
| temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff; |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, 0, _THIS_IP_); |
| xfs_bmbt_set_blockcount(ep, temp); /* truncate PREV */ |
| LEFT = *new; |
| RIGHT.br_state = PREV.br_state; |
| RIGHT.br_startblock = nullstartblock( |
| (int)xfs_bmap_worst_indlen(bma->ip, temp2)); |
| RIGHT.br_startoff = new_endoff; |
| RIGHT.br_blockcount = temp2; |
| /* insert LEFT (r[0]) and RIGHT (r[1]) at the same time */ |
| xfs_iext_insert(bma->ip, bma->idx + 1, 2, &LEFT, state); |
| (*nextents)++; |
| if (bma->cur == NULL) |
| rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; |
| else { |
| rval = XFS_ILOG_CORE; |
| error = xfs_bmbt_lookup_eq(bma->cur, new->br_startoff, |
| new->br_startblock, new->br_blockcount, |
| &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done); |
| bma->cur->bc_rec.b.br_state = XFS_EXT_NORM; |
| error = xfs_btree_insert(bma->cur, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| } |
| |
| if (xfs_bmap_needs_btree(bma->ip, whichfork)) { |
| error = xfs_bmap_extents_to_btree(bma->tp, bma->ip, |
| bma->firstblock, bma->dfops, &bma->cur, |
| 1, &tmp_rval, whichfork); |
| rval |= tmp_rval; |
| if (error) |
| goto done; |
| } |
| temp = xfs_bmap_worst_indlen(bma->ip, temp); |
| temp2 = xfs_bmap_worst_indlen(bma->ip, temp2); |
| diff = (int)(temp + temp2 - startblockval(PREV.br_startblock) - |
| (bma->cur ? bma->cur->bc_private.b.allocated : 0)); |
| if (diff > 0) { |
| error = xfs_mod_fdblocks(bma->ip->i_mount, |
| -((int64_t)diff), false); |
| ASSERT(!error); |
| if (error) |
| goto done; |
| } |
| |
| ep = xfs_iext_get_ext(ifp, bma->idx); |
| xfs_bmbt_set_startblock(ep, nullstartblock((int)temp)); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx + 2, state, _THIS_IP_); |
| xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, bma->idx + 2), |
| nullstartblock((int)temp2)); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx + 2, state, _THIS_IP_); |
| |
| bma->idx++; |
| da_new = temp + temp2; |
| break; |
| |
| case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: |
| case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: |
| case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG: |
| case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG: |
| case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: |
| case BMAP_LEFT_CONTIG: |
| case BMAP_RIGHT_CONTIG: |
| /* |
| * These cases are all impossible. |
| */ |
| ASSERT(0); |
| } |
| |
| /* add reverse mapping */ |
| error = xfs_rmap_map_extent(mp, bma->dfops, bma->ip, whichfork, new); |
| if (error) |
| goto done; |
| |
| /* convert to a btree if necessary */ |
| if (xfs_bmap_needs_btree(bma->ip, whichfork)) { |
| int tmp_logflags; /* partial log flag return val */ |
| |
| ASSERT(bma->cur == NULL); |
| error = xfs_bmap_extents_to_btree(bma->tp, bma->ip, |
| bma->firstblock, bma->dfops, &bma->cur, |
| da_old > 0, &tmp_logflags, whichfork); |
| bma->logflags |= tmp_logflags; |
| if (error) |
| goto done; |
| } |
| |
| /* adjust for changes in reserved delayed indirect blocks */ |
| if (da_old || da_new) { |
| temp = da_new; |
| if (bma->cur) |
| temp += bma->cur->bc_private.b.allocated; |
| ASSERT(temp <= da_old); |
| if (temp < da_old) |
| xfs_mod_fdblocks(bma->ip->i_mount, |
| (int64_t)(da_old - temp), false); |
| } |
| |
| /* clear out the allocated field, done with it now in any case. */ |
| if (bma->cur) |
| bma->cur->bc_private.b.allocated = 0; |
| |
| xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork); |
| done: |
| if (whichfork != XFS_COW_FORK) |
| bma->logflags |= rval; |
| return error; |
| #undef LEFT |
| #undef RIGHT |
| #undef PREV |
| } |
| |
| /* |
| * Convert an unwritten allocation to a real allocation or vice versa. |
| */ |
| STATIC int /* error */ |
| xfs_bmap_add_extent_unwritten_real( |
| struct xfs_trans *tp, |
| xfs_inode_t *ip, /* incore inode pointer */ |
| xfs_extnum_t *idx, /* extent number to update/insert */ |
| xfs_btree_cur_t **curp, /* if *curp is null, not a btree */ |
| xfs_bmbt_irec_t *new, /* new data to add to file extents */ |
| xfs_fsblock_t *first, /* pointer to firstblock variable */ |
| struct xfs_defer_ops *dfops, /* list of extents to be freed */ |
| int *logflagsp) /* inode logging flags */ |
| { |
| xfs_btree_cur_t *cur; /* btree cursor */ |
| xfs_bmbt_rec_host_t *ep; /* extent entry for idx */ |
| int error; /* error return value */ |
| int i; /* temp state */ |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| xfs_fileoff_t new_endoff; /* end offset of new entry */ |
| xfs_exntst_t newext; /* new extent state */ |
| xfs_exntst_t oldext; /* old extent state */ |
| xfs_bmbt_irec_t r[3]; /* neighbor extent entries */ |
| /* left is 0, right is 1, prev is 2 */ |
| int rval=0; /* return value (logging flags) */ |
| int state = 0;/* state bits, accessed thru macros */ |
| struct xfs_mount *mp = tp->t_mountp; |
| |
| *logflagsp = 0; |
| |
| cur = *curp; |
| ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); |
| |
| ASSERT(*idx >= 0); |
| ASSERT(*idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec)); |
| ASSERT(!isnullstartblock(new->br_startblock)); |
| |
| XFS_STATS_INC(mp, xs_add_exlist); |
| |
| #define LEFT r[0] |
| #define RIGHT r[1] |
| #define PREV r[2] |
| |
| /* |
| * Set up a bunch of variables to make the tests simpler. |
| */ |
| error = 0; |
| ep = xfs_iext_get_ext(ifp, *idx); |
| xfs_bmbt_get_all(ep, &PREV); |
| newext = new->br_state; |
| oldext = (newext == XFS_EXT_UNWRITTEN) ? |
| XFS_EXT_NORM : XFS_EXT_UNWRITTEN; |
| ASSERT(PREV.br_state == oldext); |
| new_endoff = new->br_startoff + new->br_blockcount; |
| ASSERT(PREV.br_startoff <= new->br_startoff); |
| ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff); |
| |
| /* |
| * Set flags determining what part of the previous oldext allocation |
| * extent is being replaced by a newext allocation. |
| */ |
| if (PREV.br_startoff == new->br_startoff) |
| state |= BMAP_LEFT_FILLING; |
| if (PREV.br_startoff + PREV.br_blockcount == new_endoff) |
| state |= BMAP_RIGHT_FILLING; |
| |
| /* |
| * Check and set flags if this segment has a left neighbor. |
| * Don't set contiguous if the combined extent would be too large. |
| */ |
| if (*idx > 0) { |
| state |= BMAP_LEFT_VALID; |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &LEFT); |
| |
| if (isnullstartblock(LEFT.br_startblock)) |
| state |= BMAP_LEFT_DELAY; |
| } |
| |
| if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) && |
| LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff && |
| LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock && |
| LEFT.br_state == newext && |
| LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN) |
| state |= BMAP_LEFT_CONTIG; |
| |
| /* |
| * Check and set flags if this segment has a right neighbor. |
| * Don't set contiguous if the combined extent would be too large. |
| * Also check for all-three-contiguous being too large. |
| */ |
| if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1) { |
| state |= BMAP_RIGHT_VALID; |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx + 1), &RIGHT); |
| if (isnullstartblock(RIGHT.br_startblock)) |
| state |= BMAP_RIGHT_DELAY; |
| } |
| |
| if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) && |
| new_endoff == RIGHT.br_startoff && |
| new->br_startblock + new->br_blockcount == RIGHT.br_startblock && |
| newext == RIGHT.br_state && |
| new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN && |
| ((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING | |
| BMAP_RIGHT_FILLING)) != |
| (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING | |
| BMAP_RIGHT_FILLING) || |
| LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount |
| <= MAXEXTLEN)) |
| state |= BMAP_RIGHT_CONTIG; |
| |
| /* |
| * Switch out based on the FILLING and CONTIG state bits. |
| */ |
| switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | |
| BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) { |
| case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | |
| BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: |
| /* |
| * Setting all of a previous oldext extent to newext. |
| * The left and right neighbors are both contiguous with new. |
| */ |
| --*idx; |
| |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), |
| LEFT.br_blockcount + PREV.br_blockcount + |
| RIGHT.br_blockcount); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| |
| xfs_iext_remove(ip, *idx + 1, 2, state); |
| ip->i_d.di_nextents -= 2; |
| if (cur == NULL) |
| rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; |
| else { |
| rval = XFS_ILOG_CORE; |
| if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff, |
| RIGHT.br_startblock, |
| RIGHT.br_blockcount, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_btree_delete(cur, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_btree_decrement(cur, 0, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_btree_delete(cur, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_btree_decrement(cur, 0, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_bmbt_update(cur, LEFT.br_startoff, |
| LEFT.br_startblock, |
| LEFT.br_blockcount + PREV.br_blockcount + |
| RIGHT.br_blockcount, LEFT.br_state))) |
| goto done; |
| } |
| break; |
| |
| case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG: |
| /* |
| * Setting all of a previous oldext extent to newext. |
| * The left neighbor is contiguous, the right is not. |
| */ |
| --*idx; |
| |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), |
| LEFT.br_blockcount + PREV.br_blockcount); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| |
| xfs_iext_remove(ip, *idx + 1, 1, state); |
| ip->i_d.di_nextents--; |
| if (cur == NULL) |
| rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; |
| else { |
| rval = XFS_ILOG_CORE; |
| if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff, |
| PREV.br_startblock, PREV.br_blockcount, |
| &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_btree_delete(cur, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_btree_decrement(cur, 0, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_bmbt_update(cur, LEFT.br_startoff, |
| LEFT.br_startblock, |
| LEFT.br_blockcount + PREV.br_blockcount, |
| LEFT.br_state))) |
| goto done; |
| } |
| break; |
| |
| case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: |
| /* |
| * Setting all of a previous oldext extent to newext. |
| * The right neighbor is contiguous, the left is not. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(ep, |
| PREV.br_blockcount + RIGHT.br_blockcount); |
| xfs_bmbt_set_state(ep, newext); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| xfs_iext_remove(ip, *idx + 1, 1, state); |
| ip->i_d.di_nextents--; |
| if (cur == NULL) |
| rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; |
| else { |
| rval = XFS_ILOG_CORE; |
| if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff, |
| RIGHT.br_startblock, |
| RIGHT.br_blockcount, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_btree_delete(cur, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_btree_decrement(cur, 0, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_bmbt_update(cur, new->br_startoff, |
| new->br_startblock, |
| new->br_blockcount + RIGHT.br_blockcount, |
| newext))) |
| goto done; |
| } |
| break; |
| |
| case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING: |
| /* |
| * Setting all of a previous oldext extent to newext. |
| * Neither the left nor right neighbors are contiguous with |
| * the new one. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_state(ep, newext); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| |
| if (cur == NULL) |
| rval = XFS_ILOG_DEXT; |
| else { |
| rval = 0; |
| if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff, |
| new->br_startblock, new->br_blockcount, |
| &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_bmbt_update(cur, new->br_startoff, |
| new->br_startblock, new->br_blockcount, |
| newext))) |
| goto done; |
| } |
| break; |
| |
| case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG: |
| /* |
| * Setting the first part of a previous oldext extent to newext. |
| * The left neighbor is contiguous. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx - 1, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx - 1), |
| LEFT.br_blockcount + new->br_blockcount); |
| xfs_bmbt_set_startoff(ep, |
| PREV.br_startoff + new->br_blockcount); |
| trace_xfs_bmap_post_update(ip, *idx - 1, state, _THIS_IP_); |
| |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_startblock(ep, |
| new->br_startblock + new->br_blockcount); |
| xfs_bmbt_set_blockcount(ep, |
| PREV.br_blockcount - new->br_blockcount); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| |
| --*idx; |
| |
| if (cur == NULL) |
| rval = XFS_ILOG_DEXT; |
| else { |
| rval = 0; |
| if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff, |
| PREV.br_startblock, PREV.br_blockcount, |
| &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_bmbt_update(cur, |
| PREV.br_startoff + new->br_blockcount, |
| PREV.br_startblock + new->br_blockcount, |
| PREV.br_blockcount - new->br_blockcount, |
| oldext))) |
| goto done; |
| if ((error = xfs_btree_decrement(cur, 0, &i))) |
| goto done; |
| error = xfs_bmbt_update(cur, LEFT.br_startoff, |
| LEFT.br_startblock, |
| LEFT.br_blockcount + new->br_blockcount, |
| LEFT.br_state); |
| if (error) |
| goto done; |
| } |
| break; |
| |
| case BMAP_LEFT_FILLING: |
| /* |
| * Setting the first part of a previous oldext extent to newext. |
| * The left neighbor is not contiguous. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| ASSERT(ep && xfs_bmbt_get_state(ep) == oldext); |
| xfs_bmbt_set_startoff(ep, new_endoff); |
| xfs_bmbt_set_blockcount(ep, |
| PREV.br_blockcount - new->br_blockcount); |
| xfs_bmbt_set_startblock(ep, |
| new->br_startblock + new->br_blockcount); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| |
| xfs_iext_insert(ip, *idx, 1, new, state); |
| ip->i_d.di_nextents++; |
| if (cur == NULL) |
| rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; |
| else { |
| rval = XFS_ILOG_CORE; |
| if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff, |
| PREV.br_startblock, PREV.br_blockcount, |
| &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_bmbt_update(cur, |
| PREV.br_startoff + new->br_blockcount, |
| PREV.br_startblock + new->br_blockcount, |
| PREV.br_blockcount - new->br_blockcount, |
| oldext))) |
| goto done; |
| cur->bc_rec.b = *new; |
| if ((error = xfs_btree_insert(cur, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| } |
| break; |
| |
| case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG: |
| /* |
| * Setting the last part of a previous oldext extent to newext. |
| * The right neighbor is contiguous with the new allocation. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(ep, |
| PREV.br_blockcount - new->br_blockcount); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| |
| ++*idx; |
| |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx), |
| new->br_startoff, new->br_startblock, |
| new->br_blockcount + RIGHT.br_blockcount, newext); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| |
| if (cur == NULL) |
| rval = XFS_ILOG_DEXT; |
| else { |
| rval = 0; |
| if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff, |
| PREV.br_startblock, |
| PREV.br_blockcount, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_bmbt_update(cur, PREV.br_startoff, |
| PREV.br_startblock, |
| PREV.br_blockcount - new->br_blockcount, |
| oldext))) |
| goto done; |
| if ((error = xfs_btree_increment(cur, 0, &i))) |
| goto done; |
| if ((error = xfs_bmbt_update(cur, new->br_startoff, |
| new->br_startblock, |
| new->br_blockcount + RIGHT.br_blockcount, |
| newext))) |
| goto done; |
| } |
| break; |
| |
| case BMAP_RIGHT_FILLING: |
| /* |
| * Setting the last part of a previous oldext extent to newext. |
| * The right neighbor is not contiguous. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(ep, |
| PREV.br_blockcount - new->br_blockcount); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| |
| ++*idx; |
| xfs_iext_insert(ip, *idx, 1, new, state); |
| |
| ip->i_d.di_nextents++; |
| if (cur == NULL) |
| rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; |
| else { |
| rval = XFS_ILOG_CORE; |
| if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff, |
| PREV.br_startblock, PREV.br_blockcount, |
| &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| if ((error = xfs_bmbt_update(cur, PREV.br_startoff, |
| PREV.br_startblock, |
| PREV.br_blockcount - new->br_blockcount, |
| oldext))) |
| goto done; |
| if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff, |
| new->br_startblock, new->br_blockcount, |
| &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done); |
| cur->bc_rec.b.br_state = XFS_EXT_NORM; |
| if ((error = xfs_btree_insert(cur, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| } |
| break; |
| |
| case 0: |
| /* |
| * Setting the middle part of a previous oldext extent to |
| * newext. Contiguity is impossible here. |
| * One extent becomes three extents. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(ep, |
| new->br_startoff - PREV.br_startoff); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| |
| r[0] = *new; |
| r[1].br_startoff = new_endoff; |
| r[1].br_blockcount = |
| PREV.br_startoff + PREV.br_blockcount - new_endoff; |
| r[1].br_startblock = new->br_startblock + new->br_blockcount; |
| r[1].br_state = oldext; |
| |
| ++*idx; |
| xfs_iext_insert(ip, *idx, 2, &r[0], state); |
| |
| ip->i_d.di_nextents += 2; |
| if (cur == NULL) |
| rval = XFS_ILOG_CORE | XFS_ILOG_DEXT; |
| else { |
| rval = XFS_ILOG_CORE; |
| if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff, |
| PREV.br_startblock, PREV.br_blockcount, |
| &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| /* new right extent - oldext */ |
| if ((error = xfs_bmbt_update(cur, r[1].br_startoff, |
| r[1].br_startblock, r[1].br_blockcount, |
| r[1].br_state))) |
| goto done; |
| /* new left extent - oldext */ |
| cur->bc_rec.b = PREV; |
| cur->bc_rec.b.br_blockcount = |
| new->br_startoff - PREV.br_startoff; |
| if ((error = xfs_btree_insert(cur, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| /* |
| * Reset the cursor to the position of the new extent |
| * we are about to insert as we can't trust it after |
| * the previous insert. |
| */ |
| if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff, |
| new->br_startblock, new->br_blockcount, |
| &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done); |
| /* new middle extent - newext */ |
| cur->bc_rec.b.br_state = new->br_state; |
| if ((error = xfs_btree_insert(cur, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| } |
| break; |
| |
| case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: |
| case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: |
| case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG: |
| case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG: |
| case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: |
| case BMAP_LEFT_CONTIG: |
| case BMAP_RIGHT_CONTIG: |
| /* |
| * These cases are all impossible. |
| */ |
| ASSERT(0); |
| } |
| |
| /* update reverse mappings */ |
| error = xfs_rmap_convert_extent(mp, dfops, ip, XFS_DATA_FORK, new); |
| if (error) |
| goto done; |
| |
| /* convert to a btree if necessary */ |
| if (xfs_bmap_needs_btree(ip, XFS_DATA_FORK)) { |
| int tmp_logflags; /* partial log flag return val */ |
| |
| ASSERT(cur == NULL); |
| error = xfs_bmap_extents_to_btree(tp, ip, first, dfops, &cur, |
| 0, &tmp_logflags, XFS_DATA_FORK); |
| *logflagsp |= tmp_logflags; |
| if (error) |
| goto done; |
| } |
| |
| /* clear out the allocated field, done with it now in any case. */ |
| if (cur) { |
| cur->bc_private.b.allocated = 0; |
| *curp = cur; |
| } |
| |
| xfs_bmap_check_leaf_extents(*curp, ip, XFS_DATA_FORK); |
| done: |
| *logflagsp |= rval; |
| return error; |
| #undef LEFT |
| #undef RIGHT |
| #undef PREV |
| } |
| |
| /* |
| * Convert a hole to a delayed allocation. |
| */ |
| STATIC void |
| xfs_bmap_add_extent_hole_delay( |
| xfs_inode_t *ip, /* incore inode pointer */ |
| int whichfork, |
| xfs_extnum_t *idx, /* extent number to update/insert */ |
| xfs_bmbt_irec_t *new) /* new data to add to file extents */ |
| { |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| xfs_bmbt_irec_t left; /* left neighbor extent entry */ |
| xfs_filblks_t newlen=0; /* new indirect size */ |
| xfs_filblks_t oldlen=0; /* old indirect size */ |
| xfs_bmbt_irec_t right; /* right neighbor extent entry */ |
| int state; /* state bits, accessed thru macros */ |
| xfs_filblks_t temp=0; /* temp for indirect calculations */ |
| |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| state = 0; |
| if (whichfork == XFS_COW_FORK) |
| state |= BMAP_COWFORK; |
| ASSERT(isnullstartblock(new->br_startblock)); |
| |
| /* |
| * Check and set flags if this segment has a left neighbor |
| */ |
| if (*idx > 0) { |
| state |= BMAP_LEFT_VALID; |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx - 1), &left); |
| |
| if (isnullstartblock(left.br_startblock)) |
| state |= BMAP_LEFT_DELAY; |
| } |
| |
| /* |
| * Check and set flags if the current (right) segment exists. |
| * If it doesn't exist, we're converting the hole at end-of-file. |
| */ |
| if (*idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) { |
| state |= BMAP_RIGHT_VALID; |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right); |
| |
| if (isnullstartblock(right.br_startblock)) |
| state |= BMAP_RIGHT_DELAY; |
| } |
| |
| /* |
| * Set contiguity flags on the left and right neighbors. |
| * Don't let extents get too large, even if the pieces are contiguous. |
| */ |
| if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) && |
| left.br_startoff + left.br_blockcount == new->br_startoff && |
| left.br_blockcount + new->br_blockcount <= MAXEXTLEN) |
| state |= BMAP_LEFT_CONTIG; |
| |
| if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) && |
| new->br_startoff + new->br_blockcount == right.br_startoff && |
| new->br_blockcount + right.br_blockcount <= MAXEXTLEN && |
| (!(state & BMAP_LEFT_CONTIG) || |
| (left.br_blockcount + new->br_blockcount + |
| right.br_blockcount <= MAXEXTLEN))) |
| state |= BMAP_RIGHT_CONTIG; |
| |
| /* |
| * Switch out based on the contiguity flags. |
| */ |
| switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) { |
| case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: |
| /* |
| * New allocation is contiguous with delayed allocations |
| * on the left and on the right. |
| * Merge all three into a single extent record. |
| */ |
| --*idx; |
| temp = left.br_blockcount + new->br_blockcount + |
| right.br_blockcount; |
| |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp); |
| oldlen = startblockval(left.br_startblock) + |
| startblockval(new->br_startblock) + |
| startblockval(right.br_startblock); |
| newlen = xfs_bmap_worst_indlen(ip, temp); |
| xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx), |
| nullstartblock((int)newlen)); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| |
| xfs_iext_remove(ip, *idx + 1, 1, state); |
| break; |
| |
| case BMAP_LEFT_CONTIG: |
| /* |
| * New allocation is contiguous with a delayed allocation |
| * on the left. |
| * Merge the new allocation with the left neighbor. |
| */ |
| --*idx; |
| temp = left.br_blockcount + new->br_blockcount; |
| |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, *idx), temp); |
| oldlen = startblockval(left.br_startblock) + |
| startblockval(new->br_startblock); |
| newlen = xfs_bmap_worst_indlen(ip, temp); |
| xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, *idx), |
| nullstartblock((int)newlen)); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| break; |
| |
| case BMAP_RIGHT_CONTIG: |
| /* |
| * New allocation is contiguous with a delayed allocation |
| * on the right. |
| * Merge the new allocation with the right neighbor. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| temp = new->br_blockcount + right.br_blockcount; |
| oldlen = startblockval(new->br_startblock) + |
| startblockval(right.br_startblock); |
| newlen = xfs_bmap_worst_indlen(ip, temp); |
| xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx), |
| new->br_startoff, |
| nullstartblock((int)newlen), temp, right.br_state); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| break; |
| |
| case 0: |
| /* |
| * New allocation is not contiguous with another |
| * delayed allocation. |
| * Insert a new entry. |
| */ |
| oldlen = newlen = 0; |
| xfs_iext_insert(ip, *idx, 1, new, state); |
| break; |
| } |
| if (oldlen != newlen) { |
| ASSERT(oldlen > newlen); |
| xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen), |
| false); |
| /* |
| * Nothing to do for disk quota accounting here. |
| */ |
| } |
| } |
| |
| /* |
| * Convert a hole to a real allocation. |
| */ |
| STATIC int /* error */ |
| xfs_bmap_add_extent_hole_real( |
| struct xfs_bmalloca *bma, |
| int whichfork) |
| { |
| struct xfs_bmbt_irec *new = &bma->got; |
| int error; /* error return value */ |
| int i; /* temp state */ |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| xfs_bmbt_irec_t left; /* left neighbor extent entry */ |
| xfs_bmbt_irec_t right; /* right neighbor extent entry */ |
| int rval=0; /* return value (logging flags) */ |
| int state; /* state bits, accessed thru macros */ |
| struct xfs_mount *mp; |
| |
| mp = bma->ip->i_mount; |
| ifp = XFS_IFORK_PTR(bma->ip, whichfork); |
| |
| ASSERT(bma->idx >= 0); |
| ASSERT(bma->idx <= ifp->if_bytes / sizeof(struct xfs_bmbt_rec)); |
| ASSERT(!isnullstartblock(new->br_startblock)); |
| ASSERT(!bma->cur || |
| !(bma->cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL)); |
| ASSERT(whichfork != XFS_COW_FORK); |
| |
| XFS_STATS_INC(mp, xs_add_exlist); |
| |
| state = 0; |
| if (whichfork == XFS_ATTR_FORK) |
| state |= BMAP_ATTRFORK; |
| |
| /* |
| * Check and set flags if this segment has a left neighbor. |
| */ |
| if (bma->idx > 0) { |
| state |= BMAP_LEFT_VALID; |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), &left); |
| if (isnullstartblock(left.br_startblock)) |
| state |= BMAP_LEFT_DELAY; |
| } |
| |
| /* |
| * Check and set flags if this segment has a current value. |
| * Not true if we're inserting into the "hole" at eof. |
| */ |
| if (bma->idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) { |
| state |= BMAP_RIGHT_VALID; |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &right); |
| if (isnullstartblock(right.br_startblock)) |
| state |= BMAP_RIGHT_DELAY; |
| } |
| |
| /* |
| * We're inserting a real allocation between "left" and "right". |
| * Set the contiguity flags. Don't let extents get too large. |
| */ |
| if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) && |
| left.br_startoff + left.br_blockcount == new->br_startoff && |
| left.br_startblock + left.br_blockcount == new->br_startblock && |
| left.br_state == new->br_state && |
| left.br_blockcount + new->br_blockcount <= MAXEXTLEN) |
| state |= BMAP_LEFT_CONTIG; |
| |
| if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) && |
| new->br_startoff + new->br_blockcount == right.br_startoff && |
| new->br_startblock + new->br_blockcount == right.br_startblock && |
| new->br_state == right.br_state && |
| new->br_blockcount + right.br_blockcount <= MAXEXTLEN && |
| (!(state & BMAP_LEFT_CONTIG) || |
| left.br_blockcount + new->br_blockcount + |
| right.br_blockcount <= MAXEXTLEN)) |
| state |= BMAP_RIGHT_CONTIG; |
| |
| error = 0; |
| /* |
| * Select which case we're in here, and implement it. |
| */ |
| switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) { |
| case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: |
| /* |
| * New allocation is contiguous with real allocations on the |
| * left and on the right. |
| * Merge all three into a single extent record. |
| */ |
| --bma->idx; |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx), |
| left.br_blockcount + new->br_blockcount + |
| right.br_blockcount); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); |
| |
| xfs_iext_remove(bma->ip, bma->idx + 1, 1, state); |
| |
| XFS_IFORK_NEXT_SET(bma->ip, whichfork, |
| XFS_IFORK_NEXTENTS(bma->ip, whichfork) - 1); |
| if (bma->cur == NULL) { |
| rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork); |
| } else { |
| rval = XFS_ILOG_CORE; |
| error = xfs_bmbt_lookup_eq(bma->cur, right.br_startoff, |
| right.br_startblock, right.br_blockcount, |
| &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_btree_delete(bma->cur, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_btree_decrement(bma->cur, 0, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_bmbt_update(bma->cur, left.br_startoff, |
| left.br_startblock, |
| left.br_blockcount + |
| new->br_blockcount + |
| right.br_blockcount, |
| left.br_state); |
| if (error) |
| goto done; |
| } |
| break; |
| |
| case BMAP_LEFT_CONTIG: |
| /* |
| * New allocation is contiguous with a real allocation |
| * on the left. |
| * Merge the new allocation with the left neighbor. |
| */ |
| --bma->idx; |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, bma->idx), |
| left.br_blockcount + new->br_blockcount); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); |
| |
| if (bma->cur == NULL) { |
| rval = xfs_ilog_fext(whichfork); |
| } else { |
| rval = 0; |
| error = xfs_bmbt_lookup_eq(bma->cur, left.br_startoff, |
| left.br_startblock, left.br_blockcount, |
| &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_bmbt_update(bma->cur, left.br_startoff, |
| left.br_startblock, |
| left.br_blockcount + |
| new->br_blockcount, |
| left.br_state); |
| if (error) |
| goto done; |
| } |
| break; |
| |
| case BMAP_RIGHT_CONTIG: |
| /* |
| * New allocation is contiguous with a real allocation |
| * on the right. |
| * Merge the new allocation with the right neighbor. |
| */ |
| trace_xfs_bmap_pre_update(bma->ip, bma->idx, state, _THIS_IP_); |
| xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, bma->idx), |
| new->br_startoff, new->br_startblock, |
| new->br_blockcount + right.br_blockcount, |
| right.br_state); |
| trace_xfs_bmap_post_update(bma->ip, bma->idx, state, _THIS_IP_); |
| |
| if (bma->cur == NULL) { |
| rval = xfs_ilog_fext(whichfork); |
| } else { |
| rval = 0; |
| error = xfs_bmbt_lookup_eq(bma->cur, |
| right.br_startoff, |
| right.br_startblock, |
| right.br_blockcount, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| error = xfs_bmbt_update(bma->cur, new->br_startoff, |
| new->br_startblock, |
| new->br_blockcount + |
| right.br_blockcount, |
| right.br_state); |
| if (error) |
| goto done; |
| } |
| break; |
| |
| case 0: |
| /* |
| * New allocation is not contiguous with another |
| * real allocation. |
| * Insert a new entry. |
| */ |
| xfs_iext_insert(bma->ip, bma->idx, 1, new, state); |
| XFS_IFORK_NEXT_SET(bma->ip, whichfork, |
| XFS_IFORK_NEXTENTS(bma->ip, whichfork) + 1); |
| if (bma->cur == NULL) { |
| rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork); |
| } else { |
| rval = XFS_ILOG_CORE; |
| error = xfs_bmbt_lookup_eq(bma->cur, |
| new->br_startoff, |
| new->br_startblock, |
| new->br_blockcount, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done); |
| bma->cur->bc_rec.b.br_state = new->br_state; |
| error = xfs_btree_insert(bma->cur, &i); |
| if (error) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| } |
| break; |
| } |
| |
| /* add reverse mapping */ |
| error = xfs_rmap_map_extent(mp, bma->dfops, bma->ip, whichfork, new); |
| if (error) |
| goto done; |
| |
| /* convert to a btree if necessary */ |
| if (xfs_bmap_needs_btree(bma->ip, whichfork)) { |
| int tmp_logflags; /* partial log flag return val */ |
| |
| ASSERT(bma->cur == NULL); |
| error = xfs_bmap_extents_to_btree(bma->tp, bma->ip, |
| bma->firstblock, bma->dfops, &bma->cur, |
| 0, &tmp_logflags, whichfork); |
| bma->logflags |= tmp_logflags; |
| if (error) |
| goto done; |
| } |
| |
| /* clear out the allocated field, done with it now in any case. */ |
| if (bma->cur) |
| bma->cur->bc_private.b.allocated = 0; |
| |
| xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork); |
| done: |
| bma->logflags |= rval; |
| return error; |
| } |
| |
| /* |
| * Functions used in the extent read, allocate and remove paths |
| */ |
| |
| /* |
| * Adjust the size of the new extent based on di_extsize and rt extsize. |
| */ |
| int |
| xfs_bmap_extsize_align( |
| xfs_mount_t *mp, |
| xfs_bmbt_irec_t *gotp, /* next extent pointer */ |
| xfs_bmbt_irec_t *prevp, /* previous extent pointer */ |
| xfs_extlen_t extsz, /* align to this extent size */ |
| int rt, /* is this a realtime inode? */ |
| int eof, /* is extent at end-of-file? */ |
| int delay, /* creating delalloc extent? */ |
| int convert, /* overwriting unwritten extent? */ |
| xfs_fileoff_t *offp, /* in/out: aligned offset */ |
| xfs_extlen_t *lenp) /* in/out: aligned length */ |
| { |
| xfs_fileoff_t orig_off; /* original offset */ |
| xfs_extlen_t orig_alen; /* original length */ |
| xfs_fileoff_t orig_end; /* original off+len */ |
| xfs_fileoff_t nexto; /* next file offset */ |
| xfs_fileoff_t prevo; /* previous file offset */ |
| xfs_fileoff_t align_off; /* temp for offset */ |
| xfs_extlen_t align_alen; /* temp for length */ |
| xfs_extlen_t temp; /* temp for calculations */ |
| |
| if (convert) |
| return 0; |
| |
| orig_off = align_off = *offp; |
| orig_alen = align_alen = *lenp; |
| orig_end = orig_off + orig_alen; |
| |
| /* |
| * If this request overlaps an existing extent, then don't |
| * attempt to perform any additional alignment. |
| */ |
| if (!delay && !eof && |
| (orig_off >= gotp->br_startoff) && |
| (orig_end <= gotp->br_startoff + gotp->br_blockcount)) { |
| return 0; |
| } |
| |
| /* |
| * If the file offset is unaligned vs. the extent size |
| * we need to align it. This will be possible unless |
| * the file was previously written with a kernel that didn't |
| * perform this alignment, or if a truncate shot us in the |
| * foot. |
| */ |
| temp = do_mod(orig_off, extsz); |
| if (temp) { |
| align_alen += temp; |
| align_off -= temp; |
| } |
| |
| /* Same adjustment for the end of the requested area. */ |
| temp = (align_alen % extsz); |
| if (temp) |
| align_alen += extsz - temp; |
| |
| /* |
| * For large extent hint sizes, the aligned extent might be larger than |
| * MAXEXTLEN. In that case, reduce the size by an extsz so that it pulls |
| * the length back under MAXEXTLEN. The outer allocation loops handle |
| * short allocation just fine, so it is safe to do this. We only want to |
| * do it when we are forced to, though, because it means more allocation |
| * operations are required. |
| */ |
| while (align_alen > MAXEXTLEN) |
| align_alen -= extsz; |
| ASSERT(align_alen <= MAXEXTLEN); |
| |
| /* |
| * If the previous block overlaps with this proposed allocation |
| * then move the start forward without adjusting the length. |
| */ |
| if (prevp->br_startoff != NULLFILEOFF) { |
| if (prevp->br_startblock == HOLESTARTBLOCK) |
| prevo = prevp->br_startoff; |
| else |
| prevo = prevp->br_startoff + prevp->br_blockcount; |
| } else |
| prevo = 0; |
| if (align_off != orig_off && align_off < prevo) |
| align_off = prevo; |
| /* |
| * If the next block overlaps with this proposed allocation |
| * then move the start back without adjusting the length, |
| * but not before offset 0. |
| * This may of course make the start overlap previous block, |
| * and if we hit the offset 0 limit then the next block |
| * can still overlap too. |
| */ |
| if (!eof && gotp->br_startoff != NULLFILEOFF) { |
| if ((delay && gotp->br_startblock == HOLESTARTBLOCK) || |
| (!delay && gotp->br_startblock == DELAYSTARTBLOCK)) |
| nexto = gotp->br_startoff + gotp->br_blockcount; |
| else |
| nexto = gotp->br_startoff; |
| } else |
| nexto = NULLFILEOFF; |
| if (!eof && |
| align_off + align_alen != orig_end && |
| align_off + align_alen > nexto) |
| align_off = nexto > align_alen ? nexto - align_alen : 0; |
| /* |
| * If we're now overlapping the next or previous extent that |
| * means we can't fit an extsz piece in this hole. Just move |
| * the start forward to the first valid spot and set |
| * the length so we hit the end. |
| */ |
| if (align_off != orig_off && align_off < prevo) |
| align_off = prevo; |
| if (align_off + align_alen != orig_end && |
| align_off + align_alen > nexto && |
| nexto != NULLFILEOFF) { |
| ASSERT(nexto > prevo); |
| align_alen = nexto - align_off; |
| } |
| |
| /* |
| * If realtime, and the result isn't a multiple of the realtime |
| * extent size we need to remove blocks until it is. |
| */ |
| if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) { |
| /* |
| * We're not covering the original request, or |
| * we won't be able to once we fix the length. |
| */ |
| if (orig_off < align_off || |
| orig_end > align_off + align_alen || |
| align_alen - temp < orig_alen) |
| return -EINVAL; |
| /* |
| * Try to fix it by moving the start up. |
| */ |
| if (align_off + temp <= orig_off) { |
| align_alen -= temp; |
| align_off += temp; |
| } |
| /* |
| * Try to fix it by moving the end in. |
| */ |
| else if (align_off + align_alen - temp >= orig_end) |
| align_alen -= temp; |
| /* |
| * Set the start to the minimum then trim the length. |
| */ |
| else { |
| align_alen -= orig_off - align_off; |
| align_off = orig_off; |
| align_alen -= align_alen % mp->m_sb.sb_rextsize; |
| } |
| /* |
| * Result doesn't cover the request, fail it. |
| */ |
| if (orig_off < align_off || orig_end > align_off + align_alen) |
| return -EINVAL; |
| } else { |
| ASSERT(orig_off >= align_off); |
| /* see MAXEXTLEN handling above */ |
| ASSERT(orig_end <= align_off + align_alen || |
| align_alen + extsz > MAXEXTLEN); |
| } |
| |
| #ifdef DEBUG |
| if (!eof && gotp->br_startoff != NULLFILEOFF) |
| ASSERT(align_off + align_alen <= gotp->br_startoff); |
| if (prevp->br_startoff != NULLFILEOFF) |
| ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount); |
| #endif |
| |
| *lenp = align_alen; |
| *offp = align_off; |
| return 0; |
| } |
| |
| #define XFS_ALLOC_GAP_UNITS 4 |
| |
| void |
| xfs_bmap_adjacent( |
| struct xfs_bmalloca *ap) /* bmap alloc argument struct */ |
| { |
| xfs_fsblock_t adjust; /* adjustment to block numbers */ |
| xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */ |
| xfs_mount_t *mp; /* mount point structure */ |
| int nullfb; /* true if ap->firstblock isn't set */ |
| int rt; /* true if inode is realtime */ |
| |
| #define ISVALID(x,y) \ |
| (rt ? \ |
| (x) < mp->m_sb.sb_rblocks : \ |
| XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \ |
| XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \ |
| XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks) |
| |
| mp = ap->ip->i_mount; |
| nullfb = *ap->firstblock == NULLFSBLOCK; |
| rt = XFS_IS_REALTIME_INODE(ap->ip) && |
| xfs_alloc_is_userdata(ap->datatype); |
| fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock); |
| /* |
| * If allocating at eof, and there's a previous real block, |
| * try to use its last block as our starting point. |
| */ |
| if (ap->eof && ap->prev.br_startoff != NULLFILEOFF && |
| !isnullstartblock(ap->prev.br_startblock) && |
| ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount, |
| ap->prev.br_startblock)) { |
| ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount; |
| /* |
| * Adjust for the gap between prevp and us. |
| */ |
| adjust = ap->offset - |
| (ap->prev.br_startoff + ap->prev.br_blockcount); |
| if (adjust && |
| ISVALID(ap->blkno + adjust, ap->prev.br_startblock)) |
| ap->blkno += adjust; |
| } |
| /* |
| * If not at eof, then compare the two neighbor blocks. |
| * Figure out whether either one gives us a good starting point, |
| * and pick the better one. |
| */ |
| else if (!ap->eof) { |
| xfs_fsblock_t gotbno; /* right side block number */ |
| xfs_fsblock_t gotdiff=0; /* right side difference */ |
| xfs_fsblock_t prevbno; /* left side block number */ |
| xfs_fsblock_t prevdiff=0; /* left side difference */ |
| |
| /* |
| * If there's a previous (left) block, select a requested |
| * start block based on it. |
| */ |
| if (ap->prev.br_startoff != NULLFILEOFF && |
| !isnullstartblock(ap->prev.br_startblock) && |
| (prevbno = ap->prev.br_startblock + |
| ap->prev.br_blockcount) && |
| ISVALID(prevbno, ap->prev.br_startblock)) { |
| /* |
| * Calculate gap to end of previous block. |
| */ |
| adjust = prevdiff = ap->offset - |
| (ap->prev.br_startoff + |
| ap->prev.br_blockcount); |
| /* |
| * Figure the startblock based on the previous block's |
| * end and the gap size. |
| * Heuristic! |
| * If the gap is large relative to the piece we're |
| * allocating, or using it gives us an invalid block |
| * number, then just use the end of the previous block. |
| */ |
| if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length && |
| ISVALID(prevbno + prevdiff, |
| ap->prev.br_startblock)) |
| prevbno += adjust; |
| else |
| prevdiff += adjust; |
| /* |
| * If the firstblock forbids it, can't use it, |
| * must use default. |
| */ |
| if (!rt && !nullfb && |
| XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno) |
| prevbno = NULLFSBLOCK; |
| } |
| /* |
| * No previous block or can't follow it, just default. |
| */ |
| else |
| prevbno = NULLFSBLOCK; |
| /* |
| * If there's a following (right) block, select a requested |
| * start block based on it. |
| */ |
| if (!isnullstartblock(ap->got.br_startblock)) { |
| /* |
| * Calculate gap to start of next block. |
| */ |
| adjust = gotdiff = ap->got.br_startoff - ap->offset; |
| /* |
| * Figure the startblock based on the next block's |
| * start and the gap size. |
| */ |
| gotbno = ap->got.br_startblock; |
| /* |
| * Heuristic! |
| * If the gap is large relative to the piece we're |
| * allocating, or using it gives us an invalid block |
| * number, then just use the start of the next block |
| * offset by our length. |
| */ |
| if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length && |
| ISVALID(gotbno - gotdiff, gotbno)) |
| gotbno -= adjust; |
| else if (ISVALID(gotbno - ap->length, gotbno)) { |
| gotbno -= ap->length; |
| gotdiff += adjust - ap->length; |
| } else |
| gotdiff += adjust; |
| /* |
| * If the firstblock forbids it, can't use it, |
| * must use default. |
| */ |
| if (!rt && !nullfb && |
| XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno) |
| gotbno = NULLFSBLOCK; |
| } |
| /* |
| * No next block, just default. |
| */ |
| else |
| gotbno = NULLFSBLOCK; |
| /* |
| * If both valid, pick the better one, else the only good |
| * one, else ap->blkno is already set (to 0 or the inode block). |
| */ |
| if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK) |
| ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno; |
| else if (prevbno != NULLFSBLOCK) |
| ap->blkno = prevbno; |
| else if (gotbno != NULLFSBLOCK) |
| ap->blkno = gotbno; |
| } |
| #undef ISVALID |
| } |
| |
| static int |
| xfs_bmap_longest_free_extent( |
| struct xfs_trans *tp, |
| xfs_agnumber_t ag, |
| xfs_extlen_t *blen, |
| int *notinit) |
| { |
| struct xfs_mount *mp = tp->t_mountp; |
| struct xfs_perag *pag; |
| xfs_extlen_t longest; |
| int error = 0; |
| |
| pag = xfs_perag_get(mp, ag); |
| if (!pag->pagf_init) { |
| error = xfs_alloc_pagf_init(mp, tp, ag, XFS_ALLOC_FLAG_TRYLOCK); |
| if (error) |
| goto out; |
| |
| if (!pag->pagf_init) { |
| *notinit = 1; |
| goto out; |
| } |
| } |
| |
| longest = xfs_alloc_longest_free_extent(mp, pag, |
| xfs_alloc_min_freelist(mp, pag), |
| xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE)); |
| if (*blen < longest) |
| *blen = longest; |
| |
| out: |
| xfs_perag_put(pag); |
| return error; |
| } |
| |
| static void |
| xfs_bmap_select_minlen( |
| struct xfs_bmalloca *ap, |
| struct xfs_alloc_arg *args, |
| xfs_extlen_t *blen, |
| int notinit) |
| { |
| if (notinit || *blen < ap->minlen) { |
| /* |
| * Since we did a BUF_TRYLOCK above, it is possible that |
| * there is space for this request. |
| */ |
| args->minlen = ap->minlen; |
| } else if (*blen < args->maxlen) { |
| /* |
| * If the best seen length is less than the request length, |
| * use the best as the minimum. |
| */ |
| args->minlen = *blen; |
| } else { |
| /* |
| * Otherwise we've seen an extent as big as maxlen, use that |
| * as the minimum. |
| */ |
| args->minlen = args->maxlen; |
| } |
| } |
| |
| STATIC int |
| xfs_bmap_btalloc_nullfb( |
| struct xfs_bmalloca *ap, |
| struct xfs_alloc_arg *args, |
| xfs_extlen_t *blen) |
| { |
| struct xfs_mount *mp = ap->ip->i_mount; |
| xfs_agnumber_t ag, startag; |
| int notinit = 0; |
| int error; |
| |
| args->type = XFS_ALLOCTYPE_START_BNO; |
| args->total = ap->total; |
| |
| startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno); |
| if (startag == NULLAGNUMBER) |
| startag = ag = 0; |
| |
| while (*blen < args->maxlen) { |
| error = xfs_bmap_longest_free_extent(args->tp, ag, blen, |
| ¬init); |
| if (error) |
| return error; |
| |
| if (++ag == mp->m_sb.sb_agcount) |
| ag = 0; |
| if (ag == startag) |
| break; |
| } |
| |
| xfs_bmap_select_minlen(ap, args, blen, notinit); |
| return 0; |
| } |
| |
| STATIC int |
| xfs_bmap_btalloc_filestreams( |
| struct xfs_bmalloca *ap, |
| struct xfs_alloc_arg *args, |
| xfs_extlen_t *blen) |
| { |
| struct xfs_mount *mp = ap->ip->i_mount; |
| xfs_agnumber_t ag; |
| int notinit = 0; |
| int error; |
| |
| args->type = XFS_ALLOCTYPE_NEAR_BNO; |
| args->total = ap->total; |
| |
| ag = XFS_FSB_TO_AGNO(mp, args->fsbno); |
| if (ag == NULLAGNUMBER) |
| ag = 0; |
| |
| error = xfs_bmap_longest_free_extent(args->tp, ag, blen, ¬init); |
| if (error) |
| return error; |
| |
| if (*blen < args->maxlen) { |
| error = xfs_filestream_new_ag(ap, &ag); |
| if (error) |
| return error; |
| |
| error = xfs_bmap_longest_free_extent(args->tp, ag, blen, |
| ¬init); |
| if (error) |
| return error; |
| |
| } |
| |
| xfs_bmap_select_minlen(ap, args, blen, notinit); |
| |
| /* |
| * Set the failure fallback case to look in the selected AG as stream |
| * may have moved. |
| */ |
| ap->blkno = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0); |
| return 0; |
| } |
| |
| STATIC int |
| xfs_bmap_btalloc( |
| struct xfs_bmalloca *ap) /* bmap alloc argument struct */ |
| { |
| xfs_mount_t *mp; /* mount point structure */ |
| xfs_alloctype_t atype = 0; /* type for allocation routines */ |
| xfs_extlen_t align = 0; /* minimum allocation alignment */ |
| xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */ |
| xfs_agnumber_t ag; |
| xfs_alloc_arg_t args; |
| xfs_extlen_t blen; |
| xfs_extlen_t nextminlen = 0; |
| int nullfb; /* true if ap->firstblock isn't set */ |
| int isaligned; |
| int tryagain; |
| int error; |
| int stripe_align; |
| |
| ASSERT(ap->length); |
| |
| mp = ap->ip->i_mount; |
| |
| /* stripe alignment for allocation is determined by mount parameters */ |
| stripe_align = 0; |
| if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC)) |
| stripe_align = mp->m_swidth; |
| else if (mp->m_dalign) |
| stripe_align = mp->m_dalign; |
| |
| if (ap->flags & XFS_BMAPI_COWFORK) |
| align = xfs_get_cowextsz_hint(ap->ip); |
| else if (xfs_alloc_is_userdata(ap->datatype)) |
| align = xfs_get_extsz_hint(ap->ip); |
| if (unlikely(align)) { |
| error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, |
| align, 0, ap->eof, 0, ap->conv, |
| &ap->offset, &ap->length); |
| ASSERT(!error); |
| ASSERT(ap->length); |
| } |
| |
| |
| nullfb = *ap->firstblock == NULLFSBLOCK; |
| fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, *ap->firstblock); |
| if (nullfb) { |
| if (xfs_alloc_is_userdata(ap->datatype) && |
| xfs_inode_is_filestream(ap->ip)) { |
| ag = xfs_filestream_lookup_ag(ap->ip); |
| ag = (ag != NULLAGNUMBER) ? ag : 0; |
| ap->blkno = XFS_AGB_TO_FSB(mp, ag, 0); |
| } else { |
| ap->blkno = XFS_INO_TO_FSB(mp, ap->ip->i_ino); |
| } |
| } else |
| ap->blkno = *ap->firstblock; |
| |
| xfs_bmap_adjacent(ap); |
| |
| /* |
| * If allowed, use ap->blkno; otherwise must use firstblock since |
| * it's in the right allocation group. |
| */ |
| if (nullfb || XFS_FSB_TO_AGNO(mp, ap->blkno) == fb_agno) |
| ; |
| else |
| ap->blkno = *ap->firstblock; |
| /* |
| * Normal allocation, done through xfs_alloc_vextent. |
| */ |
| tryagain = isaligned = 0; |
| memset(&args, 0, sizeof(args)); |
| args.tp = ap->tp; |
| args.mp = mp; |
| args.fsbno = ap->blkno; |
| xfs_rmap_skip_owner_update(&args.oinfo); |
| |
| /* Trim the allocation back to the maximum an AG can fit. */ |
| args.maxlen = MIN(ap->length, mp->m_ag_max_usable); |
| args.firstblock = *ap->firstblock; |
| blen = 0; |
| if (nullfb) { |
| /* |
| * Search for an allocation group with a single extent large |
| * enough for the request. If one isn't found, then adjust |
| * the minimum allocation size to the largest space found. |
| */ |
| if (xfs_alloc_is_userdata(ap->datatype) && |
| xfs_inode_is_filestream(ap->ip)) |
| error = xfs_bmap_btalloc_filestreams(ap, &args, &blen); |
| else |
| error = xfs_bmap_btalloc_nullfb(ap, &args, &blen); |
| if (error) |
| return error; |
| } else if (ap->dfops->dop_low) { |
| if (xfs_inode_is_filestream(ap->ip)) |
| args.type = XFS_ALLOCTYPE_FIRST_AG; |
| else |
| args.type = XFS_ALLOCTYPE_START_BNO; |
| args.total = args.minlen = ap->minlen; |
| } else { |
| args.type = XFS_ALLOCTYPE_NEAR_BNO; |
| args.total = ap->total; |
| args.minlen = ap->minlen; |
| } |
| /* apply extent size hints if obtained earlier */ |
| if (unlikely(align)) { |
| args.prod = align; |
| if ((args.mod = (xfs_extlen_t)do_mod(ap->offset, args.prod))) |
| args.mod = (xfs_extlen_t)(args.prod - args.mod); |
| } else if (mp->m_sb.sb_blocksize >= PAGE_SIZE) { |
| args.prod = 1; |
| args.mod = 0; |
| } else { |
| args.prod = PAGE_SIZE >> mp->m_sb.sb_blocklog; |
| if ((args.mod = (xfs_extlen_t)(do_mod(ap->offset, args.prod)))) |
| args.mod = (xfs_extlen_t)(args.prod - args.mod); |
| } |
| /* |
| * If we are not low on available data blocks, and the |
| * underlying logical volume manager is a stripe, and |
| * the file offset is zero then try to allocate data |
| * blocks on stripe unit boundary. |
| * NOTE: ap->aeof is only set if the allocation length |
| * is >= the stripe unit and the allocation offset is |
| * at the end of file. |
| */ |
| if (!ap->dfops->dop_low && ap->aeof) { |
| if (!ap->offset) { |
| args.alignment = stripe_align; |
| atype = args.type; |
| isaligned = 1; |
| /* |
| * Adjust for alignment |
| */ |
| if (blen > args.alignment && blen <= args.maxlen) |
| args.minlen = blen - args.alignment; |
| args.minalignslop = 0; |
| } else { |
| /* |
| * First try an exact bno allocation. |
| * If it fails then do a near or start bno |
| * allocation with alignment turned on. |
| */ |
| atype = args.type; |
| tryagain = 1; |
| args.type = XFS_ALLOCTYPE_THIS_BNO; |
| args.alignment = 1; |
| /* |
| * Compute the minlen+alignment for the |
| * next case. Set slop so that the value |
| * of minlen+alignment+slop doesn't go up |
| * between the calls. |
| */ |
| if (blen > stripe_align && blen <= args.maxlen) |
| nextminlen = blen - stripe_align; |
| else |
| nextminlen = args.minlen; |
| if (nextminlen + stripe_align > args.minlen + 1) |
| args.minalignslop = |
| nextminlen + stripe_align - |
| args.minlen - 1; |
| else |
| args.minalignslop = 0; |
| } |
| } else { |
| args.alignment = 1; |
| args.minalignslop = 0; |
| } |
| args.minleft = ap->minleft; |
| args.wasdel = ap->wasdel; |
| args.resv = XFS_AG_RESV_NONE; |
| args.datatype = ap->datatype; |
| if (ap->datatype & XFS_ALLOC_USERDATA_ZERO) |
| args.ip = ap->ip; |
| |
| error = xfs_alloc_vextent(&args); |
| if (error) |
| return error; |
| |
| if (tryagain && args.fsbno == NULLFSBLOCK) { |
| /* |
| * Exact allocation failed. Now try with alignment |
| * turned on. |
| */ |
| args.type = atype; |
| args.fsbno = ap->blkno; |
| args.alignment = stripe_align; |
| args.minlen = nextminlen; |
| args.minalignslop = 0; |
| isaligned = 1; |
| if ((error = xfs_alloc_vextent(&args))) |
| return error; |
| } |
| if (isaligned && args.fsbno == NULLFSBLOCK) { |
| /* |
| * allocation failed, so turn off alignment and |
| * try again. |
| */ |
| args.type = atype; |
| args.fsbno = ap->blkno; |
| args.alignment = 0; |
| if ((error = xfs_alloc_vextent(&args))) |
| return error; |
| } |
| if (args.fsbno == NULLFSBLOCK && nullfb && |
| args.minlen > ap->minlen) { |
| args.minlen = ap->minlen; |
| args.type = XFS_ALLOCTYPE_START_BNO; |
| args.fsbno = ap->blkno; |
| if ((error = xfs_alloc_vextent(&args))) |
| return error; |
| } |
| if (args.fsbno == NULLFSBLOCK && nullfb) { |
| args.fsbno = 0; |
| args.type = XFS_ALLOCTYPE_FIRST_AG; |
| args.total = ap->minlen; |
| args.minleft = 0; |
| if ((error = xfs_alloc_vextent(&args))) |
| return error; |
| ap->dfops->dop_low = true; |
| } |
| if (args.fsbno != NULLFSBLOCK) { |
| /* |
| * check the allocation happened at the same or higher AG than |
| * the first block that was allocated. |
| */ |
| ASSERT(*ap->firstblock == NULLFSBLOCK || |
| XFS_FSB_TO_AGNO(mp, *ap->firstblock) == |
| XFS_FSB_TO_AGNO(mp, args.fsbno) || |
| (ap->dfops->dop_low && |
| XFS_FSB_TO_AGNO(mp, *ap->firstblock) < |
| XFS_FSB_TO_AGNO(mp, args.fsbno))); |
| |
| ap->blkno = args.fsbno; |
| if (*ap->firstblock == NULLFSBLOCK) |
| *ap->firstblock = args.fsbno; |
| ASSERT(nullfb || fb_agno == args.agno || |
| (ap->dfops->dop_low && fb_agno < args.agno)); |
| ap->length = args.len; |
| if (!(ap->flags & XFS_BMAPI_COWFORK)) |
| ap->ip->i_d.di_nblocks += args.len; |
| xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE); |
| if (ap->wasdel) |
| ap->ip->i_delayed_blks -= args.len; |
| /* |
| * Adjust the disk quota also. This was reserved |
| * earlier. |
| */ |
| xfs_trans_mod_dquot_byino(ap->tp, ap->ip, |
| ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT : |
| XFS_TRANS_DQ_BCOUNT, |
| (long) args.len); |
| } else { |
| ap->blkno = NULLFSBLOCK; |
| ap->length = 0; |
| } |
| return 0; |
| } |
| |
| /* |
| * For a remap operation, just "allocate" an extent at the address that the |
| * caller passed in, and ensure that the AGFL is the right size. The caller |
| * will then map the "allocated" extent into the file somewhere. |
| */ |
| STATIC int |
| xfs_bmap_remap_alloc( |
| struct xfs_bmalloca *ap) |
| { |
| struct xfs_trans *tp = ap->tp; |
| struct xfs_mount *mp = tp->t_mountp; |
| xfs_agblock_t bno; |
| struct xfs_alloc_arg args; |
| int error; |
| |
| /* |
| * validate that the block number is legal - the enables us to detect |
| * and handle a silent filesystem corruption rather than crashing. |
| */ |
| memset(&args, 0, sizeof(struct xfs_alloc_arg)); |
| args.tp = ap->tp; |
| args.mp = ap->tp->t_mountp; |
| bno = *ap->firstblock; |
| args.agno = XFS_FSB_TO_AGNO(mp, bno); |
| args.agbno = XFS_FSB_TO_AGBNO(mp, bno); |
| if (args.agno >= mp->m_sb.sb_agcount || |
| args.agbno >= mp->m_sb.sb_agblocks) |
| return -EFSCORRUPTED; |
| |
| /* "Allocate" the extent from the range we passed in. */ |
| trace_xfs_bmap_remap_alloc(ap->ip, *ap->firstblock, ap->length); |
| ap->blkno = bno; |
| ap->ip->i_d.di_nblocks += ap->length; |
| xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE); |
| |
| /* Fix the freelist, like a real allocator does. */ |
| args.datatype = ap->datatype; |
| args.pag = xfs_perag_get(args.mp, args.agno); |
| ASSERT(args.pag); |
| |
| /* |
| * The freelist fixing code will decline the allocation if |
| * the size and shape of the free space doesn't allow for |
| * allocating the extent and updating all the metadata that |
| * happens during an allocation. We're remapping, not |
| * allocating, so skip that check by pretending to be freeing. |
| */ |
| error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING); |
| xfs_perag_put(args.pag); |
| if (error) |
| trace_xfs_bmap_remap_alloc_error(ap->ip, error, _RET_IP_); |
| return error; |
| } |
| |
| /* |
| * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file. |
| * It figures out where to ask the underlying allocator to put the new extent. |
| */ |
| STATIC int |
| xfs_bmap_alloc( |
| struct xfs_bmalloca *ap) /* bmap alloc argument struct */ |
| { |
| if (ap->flags & XFS_BMAPI_REMAP) |
| return xfs_bmap_remap_alloc(ap); |
| if (XFS_IS_REALTIME_INODE(ap->ip) && |
| xfs_alloc_is_userdata(ap->datatype)) |
| return xfs_bmap_rtalloc(ap); |
| return xfs_bmap_btalloc(ap); |
| } |
| |
| /* Trim extent to fit a logical block range. */ |
| void |
| xfs_trim_extent( |
| struct xfs_bmbt_irec *irec, |
| xfs_fileoff_t bno, |
| xfs_filblks_t len) |
| { |
| xfs_fileoff_t distance; |
| xfs_fileoff_t end = bno + len; |
| |
| if (irec->br_startoff + irec->br_blockcount <= bno || |
| irec->br_startoff >= end) { |
| irec->br_blockcount = 0; |
| return; |
| } |
| |
| if (irec->br_startoff < bno) { |
| distance = bno - irec->br_startoff; |
| if (isnullstartblock(irec->br_startblock)) |
| irec->br_startblock = DELAYSTARTBLOCK; |
| if (irec->br_startblock != DELAYSTARTBLOCK && |
| irec->br_startblock != HOLESTARTBLOCK) |
| irec->br_startblock += distance; |
| irec->br_startoff += distance; |
| irec->br_blockcount -= distance; |
| } |
| |
| if (end < irec->br_startoff + irec->br_blockcount) { |
| distance = irec->br_startoff + irec->br_blockcount - end; |
| irec->br_blockcount -= distance; |
| } |
| } |
| |
| /* |
| * Trim the returned map to the required bounds |
| */ |
| STATIC void |
| xfs_bmapi_trim_map( |
| struct xfs_bmbt_irec *mval, |
| struct xfs_bmbt_irec *got, |
| xfs_fileoff_t *bno, |
| xfs_filblks_t len, |
| xfs_fileoff_t obno, |
| xfs_fileoff_t end, |
| int n, |
| int flags) |
| { |
| if ((flags & XFS_BMAPI_ENTIRE) || |
| got->br_startoff + got->br_blockcount <= obno) { |
| *mval = *got; |
| if (isnullstartblock(got->br_startblock)) |
| mval->br_startblock = DELAYSTARTBLOCK; |
| return; |
| } |
| |
| if (obno > *bno) |
| *bno = obno; |
| ASSERT((*bno >= obno) || (n == 0)); |
| ASSERT(*bno < end); |
| mval->br_startoff = *bno; |
| if (isnullstartblock(got->br_startblock)) |
| mval->br_startblock = DELAYSTARTBLOCK; |
| else |
| mval->br_startblock = got->br_startblock + |
| (*bno - got->br_startoff); |
| /* |
| * Return the minimum of what we got and what we asked for for |
| * the length. We can use the len variable here because it is |
| * modified below and we could have been there before coming |
| * here if the first part of the allocation didn't overlap what |
| * was asked for. |
| */ |
| mval->br_blockcount = XFS_FILBLKS_MIN(end - *bno, |
| got->br_blockcount - (*bno - got->br_startoff)); |
| mval->br_state = got->br_state; |
| ASSERT(mval->br_blockcount <= len); |
| return; |
| } |
| |
| /* |
| * Update and validate the extent map to return |
| */ |
| STATIC void |
| xfs_bmapi_update_map( |
| struct xfs_bmbt_irec **map, |
| xfs_fileoff_t *bno, |
| xfs_filblks_t *len, |
| xfs_fileoff_t obno, |
| xfs_fileoff_t end, |
| int *n, |
| int flags) |
| { |
| xfs_bmbt_irec_t *mval = *map; |
| |
| ASSERT((flags & XFS_BMAPI_ENTIRE) || |
| ((mval->br_startoff + mval->br_blockcount) <= end)); |
| ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) || |
| (mval->br_startoff < obno)); |
| |
| *bno = mval->br_startoff + mval->br_blockcount; |
| *len = end - *bno; |
| if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) { |
| /* update previous map with new information */ |
| ASSERT(mval->br_startblock == mval[-1].br_startblock); |
| ASSERT(mval->br_blockcount > mval[-1].br_blockcount); |
| ASSERT(mval->br_state == mval[-1].br_state); |
| mval[-1].br_blockcount = mval->br_blockcount; |
| mval[-1].br_state = mval->br_state; |
| } else if (*n > 0 && mval->br_startblock != DELAYSTARTBLOCK && |
| mval[-1].br_startblock != DELAYSTARTBLOCK && |
| mval[-1].br_startblock != HOLESTARTBLOCK && |
| mval->br_startblock == mval[-1].br_startblock + |
| mval[-1].br_blockcount && |
| ((flags & XFS_BMAPI_IGSTATE) || |
| mval[-1].br_state == mval->br_state)) { |
| ASSERT(mval->br_startoff == |
| mval[-1].br_startoff + mval[-1].br_blockcount); |
| mval[-1].br_blockcount += mval->br_blockcount; |
| } else if (*n > 0 && |
| mval->br_startblock == DELAYSTARTBLOCK && |
| mval[-1].br_startblock == DELAYSTARTBLOCK && |
| mval->br_startoff == |
| mval[-1].br_startoff + mval[-1].br_blockcount) { |
| mval[-1].br_blockcount += mval->br_blockcount; |
| mval[-1].br_state = mval->br_state; |
| } else if (!((*n == 0) && |
| ((mval->br_startoff + mval->br_blockcount) <= |
| obno))) { |
| mval++; |
| (*n)++; |
| } |
| *map = mval; |
| } |
| |
| /* |
| * Map file blocks to filesystem blocks without allocation. |
| */ |
| int |
| xfs_bmapi_read( |
| struct xfs_inode *ip, |
| xfs_fileoff_t bno, |
| xfs_filblks_t len, |
| struct xfs_bmbt_irec *mval, |
| int *nmap, |
| int flags) |
| { |
| struct xfs_mount *mp = ip->i_mount; |
| struct xfs_ifork *ifp; |
| struct xfs_bmbt_irec got; |
| struct xfs_bmbt_irec prev; |
| xfs_fileoff_t obno; |
| xfs_fileoff_t end; |
| xfs_extnum_t lastx; |
| int error; |
| int eof; |
| int n = 0; |
| int whichfork = xfs_bmapi_whichfork(flags); |
| |
| ASSERT(*nmap >= 1); |
| ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK|XFS_BMAPI_ENTIRE| |
| XFS_BMAPI_IGSTATE|XFS_BMAPI_COWFORK))); |
| ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)); |
| |
| if (unlikely(XFS_TEST_ERROR( |
| (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE), |
| mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) { |
| XFS_ERROR_REPORT("xfs_bmapi_read", XFS_ERRLEVEL_LOW, mp); |
| return -EFSCORRUPTED; |
| } |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return -EIO; |
| |
| XFS_STATS_INC(mp, xs_blk_mapr); |
| |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| |
| /* No CoW fork? Return a hole. */ |
| if (whichfork == XFS_COW_FORK && !ifp) { |
| mval->br_startoff = bno; |
| mval->br_startblock = HOLESTARTBLOCK; |
| mval->br_blockcount = len; |
| mval->br_state = XFS_EXT_NORM; |
| *nmap = 1; |
| return 0; |
| } |
| |
| if (!(ifp->if_flags & XFS_IFEXTENTS)) { |
| error = xfs_iread_extents(NULL, ip, whichfork); |
| if (error) |
| return error; |
| } |
| |
| xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got, &prev); |
| end = bno + len; |
| obno = bno; |
| |
| while (bno < end && n < *nmap) { |
| /* Reading past eof, act as though there's a hole up to end. */ |
| if (eof) |
| got.br_startoff = end; |
| if (got.br_startoff > bno) { |
| /* Reading in a hole. */ |
| mval->br_startoff = bno; |
| mval->br_startblock = HOLESTARTBLOCK; |
| mval->br_blockcount = |
| XFS_FILBLKS_MIN(len, got.br_startoff - bno); |
| mval->br_state = XFS_EXT_NORM; |
| bno += mval->br_blockcount; |
| len -= mval->br_blockcount; |
| mval++; |
| n++; |
| continue; |
| } |
| |
| /* set up the extent map to return. */ |
| xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags); |
| xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags); |
| |
| /* If we're done, stop now. */ |
| if (bno >= end || n >= *nmap) |
| break; |
| |
| /* Else go on to the next record. */ |
| if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t)) |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got); |
| else |
| eof = 1; |
| } |
| *nmap = n; |
| return 0; |
| } |
| |
| int |
| xfs_bmapi_reserve_delalloc( |
| struct xfs_inode *ip, |
| int whichfork, |
| xfs_fileoff_t aoff, |
| xfs_filblks_t len, |
| struct xfs_bmbt_irec *got, |
| struct xfs_bmbt_irec *prev, |
| xfs_extnum_t *lastx, |
| int eof) |
| { |
| struct xfs_mount *mp = ip->i_mount; |
| struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); |
| xfs_extlen_t alen; |
| xfs_extlen_t indlen; |
| char rt = XFS_IS_REALTIME_INODE(ip); |
| xfs_extlen_t extsz; |
| int error; |
| |
| alen = XFS_FILBLKS_MIN(len, MAXEXTLEN); |
| if (!eof) |
| alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff); |
| |
| /* Figure out the extent size, adjust alen */ |
| if (whichfork == XFS_COW_FORK) |
| extsz = xfs_get_cowextsz_hint(ip); |
| else |
| extsz = xfs_get_extsz_hint(ip); |
| if (extsz) { |
| error = xfs_bmap_extsize_align(mp, got, prev, extsz, rt, eof, |
| 1, 0, &aoff, &alen); |
| ASSERT(!error); |
| } |
| |
| if (rt) |
| extsz = alen / mp->m_sb.sb_rextsize; |
| |
| /* |
| * Make a transaction-less quota reservation for delayed allocation |
| * blocks. This number gets adjusted later. We return if we haven't |
| * allocated blocks already inside this loop. |
| */ |
| error = xfs_trans_reserve_quota_nblks(NULL, ip, (long)alen, 0, |
| rt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS); |
| if (error) |
| return error; |
| |
| /* |
| * Split changing sb for alen and indlen since they could be coming |
| * from different places. |
| */ |
| indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen); |
| ASSERT(indlen > 0); |
| |
| if (rt) { |
| error = xfs_mod_frextents(mp, -((int64_t)extsz)); |
| } else { |
| error = xfs_mod_fdblocks(mp, -((int64_t)alen), false); |
| } |
| |
| if (error) |
| goto out_unreserve_quota; |
| |
| error = xfs_mod_fdblocks(mp, -((int64_t)indlen), false); |
| if (error) |
| goto out_unreserve_blocks; |
| |
| |
| ip->i_delayed_blks += alen; |
| |
| got->br_startoff = aoff; |
| got->br_startblock = nullstartblock(indlen); |
| got->br_blockcount = alen; |
| got->br_state = XFS_EXT_NORM; |
| xfs_bmap_add_extent_hole_delay(ip, whichfork, lastx, got); |
| |
| /* |
| * Update our extent pointer, given that xfs_bmap_add_extent_hole_delay |
| * might have merged it into one of the neighbouring ones. |
| */ |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *lastx), got); |
| |
| ASSERT(got->br_startoff <= aoff); |
| ASSERT(got->br_startoff + got->br_blockcount >= aoff + alen); |
| ASSERT(isnullstartblock(got->br_startblock)); |
| ASSERT(got->br_state == XFS_EXT_NORM); |
| return 0; |
| |
| out_unreserve_blocks: |
| if (rt) |
| xfs_mod_frextents(mp, extsz); |
| else |
| xfs_mod_fdblocks(mp, alen, false); |
| out_unreserve_quota: |
| if (XFS_IS_QUOTA_ON(mp)) |
| xfs_trans_unreserve_quota_nblks(NULL, ip, (long)alen, 0, rt ? |
| XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS); |
| return error; |
| } |
| |
| static int |
| xfs_bmapi_allocate( |
| struct xfs_bmalloca *bma) |
| { |
| struct xfs_mount *mp = bma->ip->i_mount; |
| int whichfork = xfs_bmapi_whichfork(bma->flags); |
| struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork); |
| int tmp_logflags = 0; |
| int error; |
| |
| ASSERT(bma->length > 0); |
| |
| /* |
| * For the wasdelay case, we could also just allocate the stuff asked |
| * for in this bmap call but that wouldn't be as good. |
| */ |
| if (bma->wasdel) { |
| bma->length = (xfs_extlen_t)bma->got.br_blockcount; |
| bma->offset = bma->got.br_startoff; |
| if (bma->idx != NULLEXTNUM && bma->idx) { |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx - 1), |
| &bma->prev); |
| } |
| } else { |
| bma->length = XFS_FILBLKS_MIN(bma->length, MAXEXTLEN); |
| if (!bma->eof) |
| bma->length = XFS_FILBLKS_MIN(bma->length, |
| bma->got.br_startoff - bma->offset); |
| } |
| |
| /* |
| * Set the data type being allocated. For the data fork, the first data |
| * in the file is treated differently to all other allocations. For the |
| * attribute fork, we only need to ensure the allocated range is not on |
| * the busy list. |
| */ |
| if (!(bma->flags & XFS_BMAPI_METADATA)) { |
| bma->datatype = XFS_ALLOC_NOBUSY; |
| if (whichfork == XFS_DATA_FORK) { |
| if (bma->offset == 0) |
| bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA; |
| else |
| bma->datatype |= XFS_ALLOC_USERDATA; |
| } |
| if (bma->flags & XFS_BMAPI_ZERO) |
| bma->datatype |= XFS_ALLOC_USERDATA_ZERO; |
| } |
| |
| bma->minlen = (bma->flags & XFS_BMAPI_CONTIG) ? bma->length : 1; |
| |
| /* |
| * Only want to do the alignment at the eof if it is userdata and |
| * allocation length is larger than a stripe unit. |
| */ |
| if (mp->m_dalign && bma->length >= mp->m_dalign && |
| !(bma->flags & XFS_BMAPI_METADATA) && whichfork == XFS_DATA_FORK) { |
| error = xfs_bmap_isaeof(bma, whichfork); |
| if (error) |
| return error; |
| } |
| |
| error = xfs_bmap_alloc(bma); |
| if (error) |
| return error; |
| |
| if (bma->dfops->dop_low) |
| bma->minleft = 0; |
| if (bma->cur) |
| bma->cur->bc_private.b.firstblock = *bma->firstblock; |
| if (bma->blkno == NULLFSBLOCK) |
| return 0; |
| if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) { |
| bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork); |
| bma->cur->bc_private.b.firstblock = *bma->firstblock; |
| bma->cur->bc_private.b.dfops = bma->dfops; |
| } |
| /* |
| * Bump the number of extents we've allocated |
| * in this call. |
| */ |
| bma->nallocs++; |
| |
| if (bma->cur) |
| bma->cur->bc_private.b.flags = |
| bma->wasdel ? XFS_BTCUR_BPRV_WASDEL : 0; |
| |
| bma->got.br_startoff = bma->offset; |
| bma->got.br_startblock = bma->blkno; |
| bma->got.br_blockcount = bma->length; |
| bma->got.br_state = XFS_EXT_NORM; |
| |
| /* |
| * A wasdelay extent has been initialized, so shouldn't be flagged |
| * as unwritten. |
| */ |
| if (!bma->wasdel && (bma->flags & XFS_BMAPI_PREALLOC) && |
| xfs_sb_version_hasextflgbit(&mp->m_sb)) |
| bma->got.br_state = XFS_EXT_UNWRITTEN; |
| |
| if (bma->wasdel) |
| error = xfs_bmap_add_extent_delay_real(bma, whichfork); |
| else |
| error = xfs_bmap_add_extent_hole_real(bma, whichfork); |
| |
| bma->logflags |= tmp_logflags; |
| if (error) |
| return error; |
| |
| /* |
| * Update our extent pointer, given that xfs_bmap_add_extent_delay_real |
| * or xfs_bmap_add_extent_hole_real might have merged it into one of |
| * the neighbouring ones. |
| */ |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got); |
| |
| ASSERT(bma->got.br_startoff <= bma->offset); |
| ASSERT(bma->got.br_startoff + bma->got.br_blockcount >= |
| bma->offset + bma->length); |
| ASSERT(bma->got.br_state == XFS_EXT_NORM || |
| bma->got.br_state == XFS_EXT_UNWRITTEN); |
| return 0; |
| } |
| |
| STATIC int |
| xfs_bmapi_convert_unwritten( |
| struct xfs_bmalloca *bma, |
| struct xfs_bmbt_irec *mval, |
| xfs_filblks_t len, |
| int flags) |
| { |
| int whichfork = xfs_bmapi_whichfork(flags); |
| struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork); |
| int tmp_logflags = 0; |
| int error; |
| |
| /* check if we need to do unwritten->real conversion */ |
| if (mval->br_state == XFS_EXT_UNWRITTEN && |
| (flags & XFS_BMAPI_PREALLOC)) |
| return 0; |
| |
| /* check if we need to do real->unwritten conversion */ |
| if (mval->br_state == XFS_EXT_NORM && |
| (flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) != |
| (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) |
| return 0; |
| |
| ASSERT(whichfork != XFS_COW_FORK); |
| |
| /* |
| * Modify (by adding) the state flag, if writing. |
| */ |
| ASSERT(mval->br_blockcount <= len); |
| if ((ifp->if_flags & XFS_IFBROOT) && !bma->cur) { |
| bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp, |
| bma->ip, whichfork); |
| bma->cur->bc_private.b.firstblock = *bma->firstblock; |
| bma->cur->bc_private.b.dfops = bma->dfops; |
| } |
| mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN) |
| ? XFS_EXT_NORM : XFS_EXT_UNWRITTEN; |
| |
| /* |
| * Before insertion into the bmbt, zero the range being converted |
| * if required. |
| */ |
| if (flags & XFS_BMAPI_ZERO) { |
| error = xfs_zero_extent(bma->ip, mval->br_startblock, |
| mval->br_blockcount); |
| if (error) |
| return error; |
| } |
| |
| error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, &bma->idx, |
| &bma->cur, mval, bma->firstblock, bma->dfops, |
| &tmp_logflags); |
| /* |
| * Log the inode core unconditionally in the unwritten extent conversion |
| * path because the conversion might not have done so (e.g., if the |
| * extent count hasn't changed). We need to make sure the inode is dirty |
| * in the transaction for the sake of fsync(), even if nothing has |
| * changed, because fsync() will not force the log for this transaction |
| * unless it sees the inode pinned. |
| */ |
| bma->logflags |= tmp_logflags | XFS_ILOG_CORE; |
| if (error) |
| return error; |
| |
| /* |
| * Update our extent pointer, given that |
| * xfs_bmap_add_extent_unwritten_real might have merged it into one |
| * of the neighbouring ones. |
| */ |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma->idx), &bma->got); |
| |
| /* |
| * We may have combined previously unwritten space with written space, |
| * so generate another request. |
| */ |
| if (mval->br_blockcount < len) |
| return -EAGAIN; |
| return 0; |
| } |
| |
| /* |
| * Map file blocks to filesystem blocks, and allocate blocks or convert the |
| * extent state if necessary. Details behaviour is controlled by the flags |
| * parameter. Only allocates blocks from a single allocation group, to avoid |
| * locking problems. |
| * |
| * The returned value in "firstblock" from the first call in a transaction |
| * must be remembered and presented to subsequent calls in "firstblock". |
| * An upper bound for the number of blocks to be allocated is supplied to |
| * the first call in "total"; if no allocation group has that many free |
| * blocks then the call will fail (return NULLFSBLOCK in "firstblock"). |
| */ |
| int |
| xfs_bmapi_write( |
| struct xfs_trans *tp, /* transaction pointer */ |
| struct xfs_inode *ip, /* incore inode */ |
| xfs_fileoff_t bno, /* starting file offs. mapped */ |
| xfs_filblks_t len, /* length to map in file */ |
| int flags, /* XFS_BMAPI_... */ |
| xfs_fsblock_t *firstblock, /* first allocated block |
| controls a.g. for allocs */ |
| xfs_extlen_t total, /* total blocks needed */ |
| struct xfs_bmbt_irec *mval, /* output: map values */ |
| int *nmap, /* i/o: mval size/count */ |
| struct xfs_defer_ops *dfops) /* i/o: list extents to free */ |
| { |
| struct xfs_mount *mp = ip->i_mount; |
| struct xfs_ifork *ifp; |
| struct xfs_bmalloca bma = { NULL }; /* args for xfs_bmap_alloc */ |
| xfs_fileoff_t end; /* end of mapped file region */ |
| int eof; /* after the end of extents */ |
| int error; /* error return */ |
| int n; /* current extent index */ |
| xfs_fileoff_t obno; /* old block number (offset) */ |
| int whichfork; /* data or attr fork */ |
| char inhole; /* current location is hole in file */ |
| char wasdelay; /* old extent was delayed */ |
| |
| #ifdef DEBUG |
| xfs_fileoff_t orig_bno; /* original block number value */ |
| int orig_flags; /* original flags arg value */ |
| xfs_filblks_t orig_len; /* original value of len arg */ |
| struct xfs_bmbt_irec *orig_mval; /* original value of mval */ |
| int orig_nmap; /* original value of *nmap */ |
| |
| orig_bno = bno; |
| orig_len = len; |
| orig_flags = flags; |
| orig_mval = mval; |
| orig_nmap = *nmap; |
| #endif |
| whichfork = xfs_bmapi_whichfork(flags); |
| |
| ASSERT(*nmap >= 1); |
| ASSERT(*nmap <= XFS_BMAP_MAX_NMAP); |
| ASSERT(!(flags & XFS_BMAPI_IGSTATE)); |
| ASSERT(tp != NULL); |
| ASSERT(len > 0); |
| ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL); |
| ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
| ASSERT(!(flags & XFS_BMAPI_REMAP) || whichfork == XFS_DATA_FORK); |
| ASSERT(!(flags & XFS_BMAPI_PREALLOC) || !(flags & XFS_BMAPI_REMAP)); |
| ASSERT(!(flags & XFS_BMAPI_CONVERT) || !(flags & XFS_BMAPI_REMAP)); |
| ASSERT(!(flags & XFS_BMAPI_PREALLOC) || whichfork != XFS_COW_FORK); |
| ASSERT(!(flags & XFS_BMAPI_CONVERT) || whichfork != XFS_COW_FORK); |
| |
| /* zeroing is for currently only for data extents, not metadata */ |
| ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) != |
| (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)); |
| /* |
| * we can allocate unwritten extents or pre-zero allocated blocks, |
| * but it makes no sense to do both at once. This would result in |
| * zeroing the unwritten extent twice, but it still being an |
| * unwritten extent.... |
| */ |
| ASSERT((flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO)) != |
| (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO)); |
| |
| if (unlikely(XFS_TEST_ERROR( |
| (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE), |
| mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) { |
| XFS_ERROR_REPORT("xfs_bmapi_write", XFS_ERRLEVEL_LOW, mp); |
| return -EFSCORRUPTED; |
| } |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return -EIO; |
| |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| |
| XFS_STATS_INC(mp, xs_blk_mapw); |
| |
| if (*firstblock == NULLFSBLOCK) { |
| if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE) |
| bma.minleft = be16_to_cpu(ifp->if_broot->bb_level) + 1; |
| else |
| bma.minleft = 1; |
| } else { |
| bma.minleft = 0; |
| } |
| |
| if (!(ifp->if_flags & XFS_IFEXTENTS)) { |
| error = xfs_iread_extents(tp, ip, whichfork); |
| if (error) |
| goto error0; |
| } |
| |
| xfs_bmap_search_extents(ip, bno, whichfork, &eof, &bma.idx, &bma.got, |
| &bma.prev); |
| n = 0; |
| end = bno + len; |
| obno = bno; |
| |
| bma.tp = tp; |
| bma.ip = ip; |
| bma.total = total; |
| bma.datatype = 0; |
| bma.dfops = dfops; |
| bma.firstblock = firstblock; |
| |
| while (bno < end && n < *nmap) { |
| inhole = eof || bma.got.br_startoff > bno; |
| wasdelay = !inhole && isnullstartblock(bma.got.br_startblock); |
| |
| /* |
| * Make sure we only reflink into a hole. |
| */ |
| if (flags & XFS_BMAPI_REMAP) |
| ASSERT(inhole); |
| if (flags & XFS_BMAPI_COWFORK) |
| ASSERT(!inhole); |
| |
| /* |
| * First, deal with the hole before the allocated space |
| * that we found, if any. |
| */ |
| if (inhole || wasdelay) { |
| bma.eof = eof; |
| bma.conv = !!(flags & XFS_BMAPI_CONVERT); |
| bma.wasdel = wasdelay; |
| bma.offset = bno; |
| bma.flags = flags; |
| |
| /* |
| * There's a 32/64 bit type mismatch between the |
| * allocation length request (which can be 64 bits in |
| * length) and the bma length request, which is |
| * xfs_extlen_t and therefore 32 bits. Hence we have to |
| * check for 32-bit overflows and handle them here. |
| */ |
| if (len > (xfs_filblks_t)MAXEXTLEN) |
| bma.length = MAXEXTLEN; |
| else |
| bma.length = len; |
| |
| ASSERT(len > 0); |
| ASSERT(bma.length > 0); |
| error = xfs_bmapi_allocate(&bma); |
| if (error) |
| goto error0; |
| if (bma.blkno == NULLFSBLOCK) |
| break; |
| |
| /* |
| * If this is a CoW allocation, record the data in |
| * the refcount btree for orphan recovery. |
| */ |
| if (whichfork == XFS_COW_FORK) { |
| error = xfs_refcount_alloc_cow_extent(mp, dfops, |
| bma.blkno, bma.length); |
| if (error) |
| goto error0; |
| } |
| } |
| |
| /* Deal with the allocated space we found. */ |
| xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno, |
| end, n, flags); |
| |
| /* Execute unwritten extent conversion if necessary */ |
| error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags); |
| if (error == -EAGAIN) |
| continue; |
| if (error) |
| goto error0; |
| |
| /* update the extent map to return */ |
| xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags); |
| |
| /* |
| * If we're done, stop now. Stop when we've allocated |
| * XFS_BMAP_MAX_NMAP extents no matter what. Otherwise |
| * the transaction may get too big. |
| */ |
| if (bno >= end || n >= *nmap || bma.nallocs >= *nmap) |
| break; |
| |
| /* Else go on to the next record. */ |
| bma.prev = bma.got; |
| if (++bma.idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t)) { |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, bma.idx), |
| &bma.got); |
| } else |
| eof = 1; |
| } |
| *nmap = n; |
| |
| /* |
| * Transform from btree to extents, give it cur. |
| */ |
| if (xfs_bmap_wants_extents(ip, whichfork)) { |
| int tmp_logflags = 0; |
| |
| ASSERT(bma.cur); |
| error = xfs_bmap_btree_to_extents(tp, ip, bma.cur, |
| &tmp_logflags, whichfork); |
| bma.logflags |= tmp_logflags; |
| if (error) |
| goto error0; |
| } |
| |
| ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE || |
| XFS_IFORK_NEXTENTS(ip, whichfork) > |
| XFS_IFORK_MAXEXT(ip, whichfork)); |
| error = 0; |
| error0: |
| /* |
| * Log everything. Do this after conversion, there's no point in |
| * logging the extent records if we've converted to btree format. |
| */ |
| if ((bma.logflags & xfs_ilog_fext(whichfork)) && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS) |
| bma.logflags &= ~xfs_ilog_fext(whichfork); |
| else if ((bma.logflags & xfs_ilog_fbroot(whichfork)) && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) |
| bma.logflags &= ~xfs_ilog_fbroot(whichfork); |
| /* |
| * Log whatever the flags say, even if error. Otherwise we might miss |
| * detecting a case where the data is changed, there's an error, |
| * and it's not logged so we don't shutdown when we should. |
| */ |
| if (bma.logflags) |
| xfs_trans_log_inode(tp, ip, bma.logflags); |
| |
| if (bma.cur) { |
| if (!error) { |
| ASSERT(*firstblock == NULLFSBLOCK || |
| XFS_FSB_TO_AGNO(mp, *firstblock) == |
| XFS_FSB_TO_AGNO(mp, |
| bma.cur->bc_private.b.firstblock) || |
| (dfops->dop_low && |
| XFS_FSB_TO_AGNO(mp, *firstblock) < |
| XFS_FSB_TO_AGNO(mp, |
| bma.cur->bc_private.b.firstblock))); |
| *firstblock = bma.cur->bc_private.b.firstblock; |
| } |
| xfs_btree_del_cursor(bma.cur, |
| error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); |
| } |
| if (!error) |
| xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval, |
| orig_nmap, *nmap); |
| return error; |
| } |
| |
| /* |
| * When a delalloc extent is split (e.g., due to a hole punch), the original |
| * indlen reservation must be shared across the two new extents that are left |
| * behind. |
| * |
| * Given the original reservation and the worst case indlen for the two new |
| * extents (as calculated by xfs_bmap_worst_indlen()), split the original |
| * reservation fairly across the two new extents. If necessary, steal available |
| * blocks from a deleted extent to make up a reservation deficiency (e.g., if |
| * ores == 1). The number of stolen blocks is returned. The availability and |
| * subsequent accounting of stolen blocks is the responsibility of the caller. |
| */ |
| static xfs_filblks_t |
| xfs_bmap_split_indlen( |
| xfs_filblks_t ores, /* original res. */ |
| xfs_filblks_t *indlen1, /* ext1 worst indlen */ |
| xfs_filblks_t *indlen2, /* ext2 worst indlen */ |
| xfs_filblks_t avail) /* stealable blocks */ |
| { |
| xfs_filblks_t len1 = *indlen1; |
| xfs_filblks_t len2 = *indlen2; |
| xfs_filblks_t nres = len1 + len2; /* new total res. */ |
| xfs_filblks_t stolen = 0; |
| |
| /* |
| * Steal as many blocks as we can to try and satisfy the worst case |
| * indlen for both new extents. |
| */ |
| while (nres > ores && avail) { |
| nres--; |
| avail--; |
| stolen++; |
| } |
| |
| /* |
| * The only blocks available are those reserved for the original |
| * extent and what we can steal from the extent being removed. |
| * If this still isn't enough to satisfy the combined |
| * requirements for the two new extents, skim blocks off of each |
| * of the new reservations until they match what is available. |
| */ |
| while (nres > ores) { |
| if (len1) { |
| len1--; |
| nres--; |
| } |
| if (nres == ores) |
| break; |
| if (len2) { |
| len2--; |
| nres--; |
| } |
| } |
| |
| *indlen1 = len1; |
| *indlen2 = len2; |
| |
| return stolen; |
| } |
| |
| int |
| xfs_bmap_del_extent_delay( |
| struct xfs_inode *ip, |
| int whichfork, |
| xfs_extnum_t *idx, |
| struct xfs_bmbt_irec *got, |
| struct xfs_bmbt_irec *del) |
| { |
| struct xfs_mount *mp = ip->i_mount; |
| struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); |
| struct xfs_bmbt_irec new; |
| int64_t da_old, da_new, da_diff = 0; |
| xfs_fileoff_t del_endoff, got_endoff; |
| xfs_filblks_t got_indlen, new_indlen, stolen; |
| int error = 0, state = 0; |
| bool isrt; |
| |
| XFS_STATS_INC(mp, xs_del_exlist); |
| |
| isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip); |
| del_endoff = del->br_startoff + del->br_blockcount; |
| got_endoff = got->br_startoff + got->br_blockcount; |
| da_old = startblockval(got->br_startblock); |
| da_new = 0; |
| |
| ASSERT(*idx >= 0); |
| ASSERT(*idx < ifp->if_bytes / sizeof(struct xfs_bmbt_rec)); |
| ASSERT(del->br_blockcount > 0); |
| ASSERT(got->br_startoff <= del->br_startoff); |
| ASSERT(got_endoff >= del_endoff); |
| |
| if (isrt) { |
| int64_t rtexts = XFS_FSB_TO_B(mp, del->br_blockcount); |
| |
| do_div(rtexts, mp->m_sb.sb_rextsize); |
| xfs_mod_frextents(mp, rtexts); |
| } |
| |
| /* |
| * Update the inode delalloc counter now and wait to update the |
| * sb counters as we might have to borrow some blocks for the |
| * indirect block accounting. |
| */ |
| xfs_trans_reserve_quota_nblks(NULL, ip, -((long)del->br_blockcount), 0, |
| isrt ? XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS); |
| ip->i_delayed_blks -= del->br_blockcount; |
| |
| if (whichfork == XFS_COW_FORK) |
| state |= BMAP_COWFORK; |
| |
| if (got->br_startoff == del->br_startoff) |
| state |= BMAP_LEFT_CONTIG; |
| if (got_endoff == del_endoff) |
| state |= BMAP_RIGHT_CONTIG; |
| |
| switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) { |
| case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: |
| /* |
| * Matches the whole extent. Delete the entry. |
| */ |
| xfs_iext_remove(ip, *idx, 1, state); |
| --*idx; |
| break; |
| case BMAP_LEFT_CONTIG: |
| /* |
| * Deleting the first part of the extent. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| got->br_startoff = del_endoff; |
| got->br_blockcount -= del->br_blockcount; |
| da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, |
| got->br_blockcount), da_old); |
| got->br_startblock = nullstartblock((int)da_new); |
| xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| break; |
| case BMAP_RIGHT_CONTIG: |
| /* |
| * Deleting the last part of the extent. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| got->br_blockcount = got->br_blockcount - del->br_blockcount; |
| da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, |
| got->br_blockcount), da_old); |
| got->br_startblock = nullstartblock((int)da_new); |
| xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| break; |
| case 0: |
| /* |
| * Deleting the middle of the extent. |
| * |
| * Distribute the original indlen reservation across the two new |
| * extents. Steal blocks from the deleted extent if necessary. |
| * Stealing blocks simply fudges the fdblocks accounting below. |
| * Warn if either of the new indlen reservations is zero as this |
| * can lead to delalloc problems. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| |
| got->br_blockcount = del->br_startoff - got->br_startoff; |
| got_indlen = xfs_bmap_worst_indlen(ip, got->br_blockcount); |
| |
| new.br_blockcount = got_endoff - del_endoff; |
| new_indlen = xfs_bmap_worst_indlen(ip, new.br_blockcount); |
| |
| WARN_ON_ONCE(!got_indlen || !new_indlen); |
| stolen = xfs_bmap_split_indlen(da_old, &got_indlen, &new_indlen, |
| del->br_blockcount); |
| |
| got->br_startblock = nullstartblock((int)got_indlen); |
| xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got); |
| trace_xfs_bmap_post_update(ip, *idx, 0, _THIS_IP_); |
| |
| new.br_startoff = del_endoff; |
| new.br_state = got->br_state; |
| new.br_startblock = nullstartblock((int)new_indlen); |
| |
| ++*idx; |
| xfs_iext_insert(ip, *idx, 1, &new, state); |
| |
| da_new = got_indlen + new_indlen - stolen; |
| del->br_blockcount -= stolen; |
| break; |
| } |
| |
| ASSERT(da_old >= da_new); |
| da_diff = da_old - da_new; |
| if (!isrt) |
| da_diff += del->br_blockcount; |
| if (da_diff) |
| xfs_mod_fdblocks(mp, da_diff, false); |
| return error; |
| } |
| |
| void |
| xfs_bmap_del_extent_cow( |
| struct xfs_inode *ip, |
| xfs_extnum_t *idx, |
| struct xfs_bmbt_irec *got, |
| struct xfs_bmbt_irec *del) |
| { |
| struct xfs_mount *mp = ip->i_mount; |
| struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK); |
| struct xfs_bmbt_irec new; |
| xfs_fileoff_t del_endoff, got_endoff; |
| int state = BMAP_COWFORK; |
| |
| XFS_STATS_INC(mp, xs_del_exlist); |
| |
| del_endoff = del->br_startoff + del->br_blockcount; |
| got_endoff = got->br_startoff + got->br_blockcount; |
| |
| ASSERT(*idx >= 0); |
| ASSERT(*idx < ifp->if_bytes / sizeof(struct xfs_bmbt_rec)); |
| ASSERT(del->br_blockcount > 0); |
| ASSERT(got->br_startoff <= del->br_startoff); |
| ASSERT(got_endoff >= del_endoff); |
| ASSERT(!isnullstartblock(got->br_startblock)); |
| |
| if (got->br_startoff == del->br_startoff) |
| state |= BMAP_LEFT_CONTIG; |
| if (got_endoff == del_endoff) |
| state |= BMAP_RIGHT_CONTIG; |
| |
| switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) { |
| case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG: |
| /* |
| * Matches the whole extent. Delete the entry. |
| */ |
| xfs_iext_remove(ip, *idx, 1, state); |
| --*idx; |
| break; |
| case BMAP_LEFT_CONTIG: |
| /* |
| * Deleting the first part of the extent. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| got->br_startoff = del_endoff; |
| got->br_blockcount -= del->br_blockcount; |
| got->br_startblock = del->br_startblock + del->br_blockcount; |
| xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| break; |
| case BMAP_RIGHT_CONTIG: |
| /* |
| * Deleting the last part of the extent. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| got->br_blockcount -= del->br_blockcount; |
| xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| break; |
| case 0: |
| /* |
| * Deleting the middle of the extent. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| got->br_blockcount = del->br_startoff - got->br_startoff; |
| xfs_bmbt_set_all(xfs_iext_get_ext(ifp, *idx), got); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| |
| new.br_startoff = del_endoff; |
| new.br_blockcount = got_endoff - del_endoff; |
| new.br_state = got->br_state; |
| new.br_startblock = del->br_startblock + del->br_blockcount; |
| |
| ++*idx; |
| xfs_iext_insert(ip, *idx, 1, &new, state); |
| break; |
| } |
| } |
| |
| /* |
| * Called by xfs_bmapi to update file extent records and the btree |
| * after removing space (or undoing a delayed allocation). |
| */ |
| STATIC int /* error */ |
| xfs_bmap_del_extent( |
| xfs_inode_t *ip, /* incore inode pointer */ |
| xfs_trans_t *tp, /* current transaction pointer */ |
| xfs_extnum_t *idx, /* extent number to update/delete */ |
| struct xfs_defer_ops *dfops, /* list of extents to be freed */ |
| xfs_btree_cur_t *cur, /* if null, not a btree */ |
| xfs_bmbt_irec_t *del, /* data to remove from extents */ |
| int *logflagsp, /* inode logging flags */ |
| int whichfork, /* data or attr fork */ |
| int bflags) /* bmapi flags */ |
| { |
| xfs_filblks_t da_new; /* new delay-alloc indirect blocks */ |
| xfs_filblks_t da_old; /* old delay-alloc indirect blocks */ |
| xfs_fsblock_t del_endblock=0; /* first block past del */ |
| xfs_fileoff_t del_endoff; /* first offset past del */ |
| int delay; /* current block is delayed allocated */ |
| int do_fx; /* free extent at end of routine */ |
| xfs_bmbt_rec_host_t *ep; /* current extent entry pointer */ |
| int error; /* error return value */ |
| int flags; /* inode logging flags */ |
| xfs_bmbt_irec_t got; /* current extent entry */ |
| xfs_fileoff_t got_endoff; /* first offset past got */ |
| int i; /* temp state */ |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| xfs_mount_t *mp; /* mount structure */ |
| xfs_filblks_t nblks; /* quota/sb block count */ |
| xfs_bmbt_irec_t new; /* new record to be inserted */ |
| /* REFERENCED */ |
| uint qfield; /* quota field to update */ |
| xfs_filblks_t temp; /* for indirect length calculations */ |
| xfs_filblks_t temp2; /* for indirect length calculations */ |
| int state = 0; |
| |
| mp = ip->i_mount; |
| XFS_STATS_INC(mp, xs_del_exlist); |
| |
| if (whichfork == XFS_ATTR_FORK) |
| state |= BMAP_ATTRFORK; |
| else if (whichfork == XFS_COW_FORK) |
| state |= BMAP_COWFORK; |
| |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| ASSERT((*idx >= 0) && (*idx < ifp->if_bytes / |
| (uint)sizeof(xfs_bmbt_rec_t))); |
| ASSERT(del->br_blockcount > 0); |
| ep = xfs_iext_get_ext(ifp, *idx); |
| xfs_bmbt_get_all(ep, &got); |
| ASSERT(got.br_startoff <= del->br_startoff); |
| del_endoff = del->br_startoff + del->br_blockcount; |
| got_endoff = got.br_startoff + got.br_blockcount; |
| ASSERT(got_endoff >= del_endoff); |
| delay = isnullstartblock(got.br_startblock); |
| ASSERT(isnullstartblock(del->br_startblock) == delay); |
| flags = 0; |
| qfield = 0; |
| error = 0; |
| /* |
| * If deleting a real allocation, must free up the disk space. |
| */ |
| if (!delay) { |
| flags = XFS_ILOG_CORE; |
| /* |
| * Realtime allocation. Free it and record di_nblocks update. |
| */ |
| if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) { |
| xfs_fsblock_t bno; |
| xfs_filblks_t len; |
| |
| ASSERT(do_mod(del->br_blockcount, |
| mp->m_sb.sb_rextsize) == 0); |
| ASSERT(do_mod(del->br_startblock, |
| mp->m_sb.sb_rextsize) == 0); |
| bno = del->br_startblock; |
| len = del->br_blockcount; |
| do_div(bno, mp->m_sb.sb_rextsize); |
| do_div(len, mp->m_sb.sb_rextsize); |
| error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len); |
| if (error) |
| goto done; |
| do_fx = 0; |
| nblks = len * mp->m_sb.sb_rextsize; |
| qfield = XFS_TRANS_DQ_RTBCOUNT; |
| } |
| /* |
| * Ordinary allocation. |
| */ |
| else { |
| do_fx = 1; |
| nblks = del->br_blockcount; |
| qfield = XFS_TRANS_DQ_BCOUNT; |
| } |
| /* |
| * Set up del_endblock and cur for later. |
| */ |
| del_endblock = del->br_startblock + del->br_blockcount; |
| if (cur) { |
| if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff, |
| got.br_startblock, got.br_blockcount, |
| &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| } |
| da_old = da_new = 0; |
| } else { |
| da_old = startblockval(got.br_startblock); |
| da_new = 0; |
| nblks = 0; |
| do_fx = 0; |
| } |
| |
| /* |
| * Set flag value to use in switch statement. |
| * Left-contig is 2, right-contig is 1. |
| */ |
| switch (((got.br_startoff == del->br_startoff) << 1) | |
| (got_endoff == del_endoff)) { |
| case 3: |
| /* |
| * Matches the whole extent. Delete the entry. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_iext_remove(ip, *idx, 1, |
| whichfork == XFS_ATTR_FORK ? BMAP_ATTRFORK : 0); |
| --*idx; |
| if (delay) |
| break; |
| |
| XFS_IFORK_NEXT_SET(ip, whichfork, |
| XFS_IFORK_NEXTENTS(ip, whichfork) - 1); |
| flags |= XFS_ILOG_CORE; |
| if (!cur) { |
| flags |= xfs_ilog_fext(whichfork); |
| break; |
| } |
| if ((error = xfs_btree_delete(cur, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| break; |
| |
| case 2: |
| /* |
| * Deleting the first part of the extent. |
| */ |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_startoff(ep, del_endoff); |
| temp = got.br_blockcount - del->br_blockcount; |
| xfs_bmbt_set_blockcount(ep, temp); |
| if (delay) { |
| temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp), |
| da_old); |
| xfs_bmbt_set_startblock(ep, nullstartblock((int)temp)); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| da_new = temp; |
| break; |
| } |
| xfs_bmbt_set_startblock(ep, del_endblock); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| if (!cur) { |
| flags |= xfs_ilog_fext(whichfork); |
| break; |
| } |
| if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock, |
| got.br_blockcount - del->br_blockcount, |
| got.br_state))) |
| goto done; |
| break; |
| |
| case 1: |
| /* |
| * Deleting the last part of the extent. |
| */ |
| temp = got.br_blockcount - del->br_blockcount; |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(ep, temp); |
| if (delay) { |
| temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp), |
| da_old); |
| xfs_bmbt_set_startblock(ep, nullstartblock((int)temp)); |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| da_new = temp; |
| break; |
| } |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| if (!cur) { |
| flags |= xfs_ilog_fext(whichfork); |
| break; |
| } |
| if ((error = xfs_bmbt_update(cur, got.br_startoff, |
| got.br_startblock, |
| got.br_blockcount - del->br_blockcount, |
| got.br_state))) |
| goto done; |
| break; |
| |
| case 0: |
| /* |
| * Deleting the middle of the extent. |
| */ |
| temp = del->br_startoff - got.br_startoff; |
| trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_); |
| xfs_bmbt_set_blockcount(ep, temp); |
| new.br_startoff = del_endoff; |
| temp2 = got_endoff - del_endoff; |
| new.br_blockcount = temp2; |
| new.br_state = got.br_state; |
| if (!delay) { |
| new.br_startblock = del_endblock; |
| flags |= XFS_ILOG_CORE; |
| if (cur) { |
| if ((error = xfs_bmbt_update(cur, |
| got.br_startoff, |
| got.br_startblock, temp, |
| got.br_state))) |
| goto done; |
| if ((error = xfs_btree_increment(cur, 0, &i))) |
| goto done; |
| cur->bc_rec.b = new; |
| error = xfs_btree_insert(cur, &i); |
| if (error && error != -ENOSPC) |
| goto done; |
| /* |
| * If get no-space back from btree insert, |
| * it tried a split, and we have a zero |
| * block reservation. |
| * Fix up our state and return the error. |
| */ |
| if (error == -ENOSPC) { |
| /* |
| * Reset the cursor, don't trust |
| * it after any insert operation. |
| */ |
| if ((error = xfs_bmbt_lookup_eq(cur, |
| got.br_startoff, |
| got.br_startblock, |
| temp, &i))) |
| goto done; |
| XFS_WANT_CORRUPTED_GOTO(mp, |
| i == 1, done); |
| /* |
| * Update the btree record back |
| * to the original value. |
| */ |
| if ((error = xfs_bmbt_update(cur, |
| got.br_startoff, |
| got.br_startblock, |
| got.br_blockcount, |
| got.br_state))) |
| goto done; |
| /* |
| * Reset the extent record back |
| * to the original value. |
| */ |
| xfs_bmbt_set_blockcount(ep, |
| got.br_blockcount); |
| flags = 0; |
| error = -ENOSPC; |
| goto done; |
| } |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done); |
| } else |
| flags |= xfs_ilog_fext(whichfork); |
| XFS_IFORK_NEXT_SET(ip, whichfork, |
| XFS_IFORK_NEXTENTS(ip, whichfork) + 1); |
| } else { |
| xfs_filblks_t stolen; |
| ASSERT(whichfork == XFS_DATA_FORK); |
| |
| /* |
| * Distribute the original indlen reservation across the |
| * two new extents. Steal blocks from the deleted extent |
| * if necessary. Stealing blocks simply fudges the |
| * fdblocks accounting in xfs_bunmapi(). |
| */ |
| temp = xfs_bmap_worst_indlen(ip, got.br_blockcount); |
| temp2 = xfs_bmap_worst_indlen(ip, new.br_blockcount); |
| stolen = xfs_bmap_split_indlen(da_old, &temp, &temp2, |
| del->br_blockcount); |
| da_new = temp + temp2 - stolen; |
| del->br_blockcount -= stolen; |
| |
| /* |
| * Set the reservation for each extent. Warn if either |
| * is zero as this can lead to delalloc problems. |
| */ |
| WARN_ON_ONCE(!temp || !temp2); |
| xfs_bmbt_set_startblock(ep, nullstartblock((int)temp)); |
| new.br_startblock = nullstartblock((int)temp2); |
| } |
| trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_); |
| xfs_iext_insert(ip, *idx + 1, 1, &new, state); |
| ++*idx; |
| break; |
| } |
| |
| /* remove reverse mapping */ |
| if (!delay) { |
| error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, del); |
| if (error) |
| goto done; |
| } |
| |
| /* |
| * If we need to, add to list of extents to delete. |
| */ |
| if (do_fx && !(bflags & XFS_BMAPI_REMAP)) { |
| if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) { |
| error = xfs_refcount_decrease_extent(mp, dfops, del); |
| if (error) |
| goto done; |
| } else |
| xfs_bmap_add_free(mp, dfops, del->br_startblock, |
| del->br_blockcount, NULL); |
| } |
| |
| /* |
| * Adjust inode # blocks in the file. |
| */ |
| if (nblks) |
| ip->i_d.di_nblocks -= nblks; |
| /* |
| * Adjust quota data. |
| */ |
| if (qfield && !(bflags & XFS_BMAPI_REMAP)) |
| xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks); |
| |
| /* |
| * Account for change in delayed indirect blocks. |
| * Nothing to do for disk quota accounting here. |
| */ |
| ASSERT(da_old >= da_new); |
| if (da_old > da_new) |
| xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new), false); |
| done: |
| *logflagsp = flags; |
| return error; |
| } |
| |
| /* |
| * Unmap (remove) blocks from a file. |
| * If nexts is nonzero then the number of extents to remove is limited to |
| * that value. If not all extents in the block range can be removed then |
| * *done is set. |
| */ |
| int /* error */ |
| __xfs_bunmapi( |
| xfs_trans_t *tp, /* transaction pointer */ |
| struct xfs_inode *ip, /* incore inode */ |
| xfs_fileoff_t bno, /* starting offset to unmap */ |
| xfs_filblks_t *rlen, /* i/o: amount remaining */ |
| int flags, /* misc flags */ |
| xfs_extnum_t nexts, /* number of extents max */ |
| xfs_fsblock_t *firstblock, /* first allocated block |
| controls a.g. for allocs */ |
| struct xfs_defer_ops *dfops) /* i/o: deferred updates */ |
| { |
| xfs_btree_cur_t *cur; /* bmap btree cursor */ |
| xfs_bmbt_irec_t del; /* extent being deleted */ |
| int eof; /* is deleting at eof */ |
| xfs_bmbt_rec_host_t *ep; /* extent record pointer */ |
| int error; /* error return value */ |
| xfs_extnum_t extno; /* extent number in list */ |
| xfs_bmbt_irec_t got; /* current extent record */ |
| xfs_ifork_t *ifp; /* inode fork pointer */ |
| int isrt; /* freeing in rt area */ |
| xfs_extnum_t lastx; /* last extent index used */ |
| int logflags; /* transaction logging flags */ |
| xfs_extlen_t mod; /* rt extent offset */ |
| xfs_mount_t *mp; /* mount structure */ |
| xfs_extnum_t nextents; /* number of file extents */ |
| xfs_bmbt_irec_t prev; /* previous extent record */ |
| xfs_fileoff_t start; /* first file offset deleted */ |
| int tmp_logflags; /* partial logging flags */ |
| int wasdel; /* was a delayed alloc extent */ |
| int whichfork; /* data or attribute fork */ |
| xfs_fsblock_t sum; |
| xfs_filblks_t len = *rlen; /* length to unmap in file */ |
| |
| trace_xfs_bunmap(ip, bno, len, flags, _RET_IP_); |
| |
| whichfork = xfs_bmapi_whichfork(flags); |
| ASSERT(whichfork != XFS_COW_FORK); |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| if (unlikely( |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) { |
| XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW, |
| ip->i_mount); |
| return -EFSCORRUPTED; |
| } |
| mp = ip->i_mount; |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return -EIO; |
| |
| ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
| ASSERT(len > 0); |
| ASSERT(nexts >= 0); |
| |
| if (!(ifp->if_flags & XFS_IFEXTENTS) && |
| (error = xfs_iread_extents(tp, ip, whichfork))) |
| return error; |
| nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| if (nextents == 0) { |
| *rlen = 0; |
| return 0; |
| } |
| XFS_STATS_INC(mp, xs_blk_unmap); |
| isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip); |
| start = bno; |
| bno = start + len - 1; |
| ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got, |
| &prev); |
| |
| /* |
| * Check to see if the given block number is past the end of the |
| * file, back up to the last block if so... |
| */ |
| if (eof) { |
| ep = xfs_iext_get_ext(ifp, --lastx); |
| xfs_bmbt_get_all(ep, &got); |
| bno = got.br_startoff + got.br_blockcount - 1; |
| } |
| logflags = 0; |
| if (ifp->if_flags & XFS_IFBROOT) { |
| ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE); |
| cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); |
| cur->bc_private.b.firstblock = *firstblock; |
| cur->bc_private.b.dfops = dfops; |
| cur->bc_private.b.flags = 0; |
| } else |
| cur = NULL; |
| |
| if (isrt) { |
| /* |
| * Synchronize by locking the bitmap inode. |
| */ |
| xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP); |
| xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL); |
| xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM); |
| xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL); |
| } |
| |
| extno = 0; |
| while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 && |
| (nexts == 0 || extno < nexts)) { |
| /* |
| * Is the found extent after a hole in which bno lives? |
| * Just back up to the previous extent, if so. |
| */ |
| if (got.br_startoff > bno) { |
| if (--lastx < 0) |
| break; |
| ep = xfs_iext_get_ext(ifp, lastx); |
| xfs_bmbt_get_all(ep, &got); |
| } |
| /* |
| * Is the last block of this extent before the range |
| * we're supposed to delete? If so, we're done. |
| */ |
| bno = XFS_FILEOFF_MIN(bno, |
| got.br_startoff + got.br_blockcount - 1); |
| if (bno < start) |
| break; |
| /* |
| * Then deal with the (possibly delayed) allocated space |
| * we found. |
| */ |
| ASSERT(ep != NULL); |
| del = got; |
| wasdel = isnullstartblock(del.br_startblock); |
| if (got.br_startoff < start) { |
| del.br_startoff = start; |
| del.br_blockcount -= start - got.br_startoff; |
| if (!wasdel) |
| del.br_startblock += start - got.br_startoff; |
| } |
| if (del.br_startoff + del.br_blockcount > bno + 1) |
| del.br_blockcount = bno + 1 - del.br_startoff; |
| sum = del.br_startblock + del.br_blockcount; |
| if (isrt && |
| (mod = do_mod(sum, mp->m_sb.sb_rextsize))) { |
| /* |
| * Realtime extent not lined up at the end. |
| * The extent could have been split into written |
| * and unwritten pieces, or we could just be |
| * unmapping part of it. But we can't really |
| * get rid of part of a realtime extent. |
| */ |
| if (del.br_state == XFS_EXT_UNWRITTEN || |
| !xfs_sb_version_hasextflgbit(&mp->m_sb)) { |
| /* |
| * This piece is unwritten, or we're not |
| * using unwritten extents. Skip over it. |
| */ |
| ASSERT(bno >= mod); |
| bno -= mod > del.br_blockcount ? |
| del.br_blockcount : mod; |
| if (bno < got.br_startoff) { |
| if (--lastx >= 0) |
| xfs_bmbt_get_all(xfs_iext_get_ext( |
| ifp, lastx), &got); |
| } |
| continue; |
| } |
| /* |
| * It's written, turn it unwritten. |
| * This is better than zeroing it. |
| */ |
| ASSERT(del.br_state == XFS_EXT_NORM); |
| ASSERT(tp->t_blk_res > 0); |
| /* |
| * If this spans a realtime extent boundary, |
| * chop it back to the start of the one we end at. |
| */ |
| if (del.br_blockcount > mod) { |
| del.br_startoff += del.br_blockcount - mod; |
| del.br_startblock += del.br_blockcount - mod; |
| del.br_blockcount = mod; |
| } |
| del.br_state = XFS_EXT_UNWRITTEN; |
| error = xfs_bmap_add_extent_unwritten_real(tp, ip, |
| &lastx, &cur, &del, firstblock, dfops, |
| &logflags); |
| if (error) |
| goto error0; |
| goto nodelete; |
| } |
| if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) { |
| /* |
| * Realtime extent is lined up at the end but not |
| * at the front. We'll get rid of full extents if |
| * we can. |
| */ |
| mod = mp->m_sb.sb_rextsize - mod; |
| if (del.br_blockcount > mod) { |
| del.br_blockcount -= mod; |
| del.br_startoff += mod; |
| del.br_startblock += mod; |
| } else if ((del.br_startoff == start && |
| (del.br_state == XFS_EXT_UNWRITTEN || |
| tp->t_blk_res == 0)) || |
| !xfs_sb_version_hasextflgbit(&mp->m_sb)) { |
| /* |
| * Can't make it unwritten. There isn't |
| * a full extent here so just skip it. |
| */ |
| ASSERT(bno >= del.br_blockcount); |
| bno -= del.br_blockcount; |
| if (got.br_startoff > bno) { |
| if (--lastx >= 0) { |
| ep = xfs_iext_get_ext(ifp, |
| lastx); |
| xfs_bmbt_get_all(ep, &got); |
| } |
| } |
| continue; |
| } else if (del.br_state == XFS_EXT_UNWRITTEN) { |
| /* |
| * This one is already unwritten. |
| * It must have a written left neighbor. |
| * Unwrite the killed part of that one and |
| * try again. |
| */ |
| ASSERT(lastx > 0); |
| xfs_bmbt_get_all(xfs_iext_get_ext(ifp, |
| lastx - 1), &prev); |
| ASSERT(prev.br_state == XFS_EXT_NORM); |
| ASSERT(!isnullstartblock(prev.br_startblock)); |
| ASSERT(del.br_startblock == |
| prev.br_startblock + prev.br_blockcount); |
| if (prev.br_startoff < start) { |
| mod = start - prev.br_startoff; |
| prev.br_blockcount -= mod; |
| prev.br_startblock += mod; |
| prev.br_startoff = start; |
| } |
| prev.br_state = XFS_EXT_UNWRITTEN; |
| lastx--; |
| error = xfs_bmap_add_extent_unwritten_real(tp, |
| ip, &lastx, &cur, &prev, |
| firstblock, dfops, &logflags); |
| if (error) |
| goto error0; |
| goto nodelete; |
| } else { |
| ASSERT(del.br_state == XFS_EXT_NORM); |
| del.br_state = XFS_EXT_UNWRITTEN; |
| error = xfs_bmap_add_extent_unwritten_real(tp, |
| ip, &lastx, &cur, &del, |
| firstblock, dfops, &logflags); |
| if (error) |
| goto error0; |
| goto nodelete; |
| } |
| } |
| |
| /* |
| * If it's the case where the directory code is running |
| * with no block reservation, and the deleted block is in |
| * the middle of its extent, and the resulting insert |
| * of an extent would cause transformation to btree format, |
| * then reject it. The calling code will then swap |
| * blocks around instead. |
| * We have to do this now, rather than waiting for the |
| * conversion to btree format, since the transaction |
| * will be dirty. |
| */ |
| if (!wasdel && tp->t_blk_res == 0 && |
| XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS && |
| XFS_IFORK_NEXTENTS(ip, whichfork) >= /* Note the >= */ |
| XFS_IFORK_MAXEXT(ip, whichfork) && |
| del.br_startoff > got.br_startoff && |
| del.br_startoff + del.br_blockcount < |
| got.br_startoff + got.br_blockcount) { |
| error = -ENOSPC; |
| goto error0; |
| } |
| |
| /* |
| * Unreserve quota and update realtime free space, if |
| * appropriate. If delayed allocation, update the inode delalloc |
| * counter now and wait to update the sb counters as |
| * xfs_bmap_del_extent() might need to borrow some blocks. |
| */ |
| if (wasdel) { |
| ASSERT(startblockval(del.br_startblock) > 0); |
| if (isrt) { |
| xfs_filblks_t rtexts; |
| |
| rtexts = XFS_FSB_TO_B(mp, del.br_blockcount); |
| do_div(rtexts, mp->m_sb.sb_rextsize); |
| xfs_mod_frextents(mp, (int64_t)rtexts); |
| (void)xfs_trans_reserve_quota_nblks(NULL, |
| ip, -((long)del.br_blockcount), 0, |
| XFS_QMOPT_RES_RTBLKS); |
| } else { |
| (void)xfs_trans_reserve_quota_nblks(NULL, |
| ip, -((long)del.br_blockcount), 0, |
| XFS_QMOPT_RES_REGBLKS); |
| } |
| ip->i_delayed_blks -= del.br_blockcount; |
| if (cur) |
| cur->bc_private.b.flags |= |
| XFS_BTCUR_BPRV_WASDEL; |
| } else if (cur) |
| cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL; |
| |
| error = xfs_bmap_del_extent(ip, tp, &lastx, dfops, cur, &del, |
| &tmp_logflags, whichfork, flags); |
| logflags |= tmp_logflags; |
| if (error) |
| goto error0; |
| |
| if (!isrt && wasdel) |
| xfs_mod_fdblocks(mp, (int64_t)del.br_blockcount, false); |
| |
| bno = del.br_startoff - 1; |
| nodelete: |
| /* |
| * If not done go on to the next (previous) record. |
| */ |
| if (bno != (xfs_fileoff_t)-1 && bno >= start) { |
| if (lastx >= 0) { |
| ep = xfs_iext_get_ext(ifp, lastx); |
| if (xfs_bmbt_get_startoff(ep) > bno) { |
| if (--lastx >= 0) |
| ep = xfs_iext_get_ext(ifp, |
| lastx); |
| } |
| xfs_bmbt_get_all(ep, &got); |
| } |
| extno++; |
| } |
| } |
| if (bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0) |
| *rlen = 0; |
| else |
| *rlen = bno - start + 1; |
| |
| /* |
| * Convert to a btree if necessary. |
| */ |
| if (xfs_bmap_needs_btree(ip, whichfork)) { |
| ASSERT(cur == NULL); |
| error = xfs_bmap_extents_to_btree(tp, ip, firstblock, dfops, |
| &cur, 0, &tmp_logflags, whichfork); |
| logflags |= tmp_logflags; |
| if (error) |
| goto error0; |
| } |
| /* |
| * transform from btree to extents, give it cur |
| */ |
| else if (xfs_bmap_wants_extents(ip, whichfork)) { |
| ASSERT(cur != NULL); |
| error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags, |
| whichfork); |
| logflags |= tmp_logflags; |
| if (error) |
| goto error0; |
| } |
| /* |
| * transform from extents to local? |
| */ |
| error = 0; |
| error0: |
| /* |
| * Log everything. Do this after conversion, there's no point in |
| * logging the extent records if we've converted to btree format. |
| */ |
| if ((logflags & xfs_ilog_fext(whichfork)) && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS) |
| logflags &= ~xfs_ilog_fext(whichfork); |
| else if ((logflags & xfs_ilog_fbroot(whichfork)) && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) |
| logflags &= ~xfs_ilog_fbroot(whichfork); |
| /* |
| * Log inode even in the error case, if the transaction |
| * is dirty we'll need to shut down the filesystem. |
| */ |
| if (logflags) |
| xfs_trans_log_inode(tp, ip, logflags); |
| if (cur) { |
| if (!error) { |
| *firstblock = cur->bc_private.b.firstblock; |
| cur->bc_private.b.allocated = 0; |
| } |
| xfs_btree_del_cursor(cur, |
| error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); |
| } |
| return error; |
| } |
| |
| /* Unmap a range of a file. */ |
| int |
| xfs_bunmapi( |
| xfs_trans_t *tp, |
| struct xfs_inode *ip, |
| xfs_fileoff_t bno, |
| xfs_filblks_t len, |
| int flags, |
| xfs_extnum_t nexts, |
| xfs_fsblock_t *firstblock, |
| struct xfs_defer_ops *dfops, |
| int *done) |
| { |
| int error; |
| |
| error = __xfs_bunmapi(tp, ip, bno, &len, flags, nexts, firstblock, |
| dfops); |
| *done = (len == 0); |
| return error; |
| } |
| |
| /* |
| * Determine whether an extent shift can be accomplished by a merge with the |
| * extent that precedes the target hole of the shift. |
| */ |
| STATIC bool |
| xfs_bmse_can_merge( |
| struct xfs_bmbt_irec *left, /* preceding extent */ |
| struct xfs_bmbt_irec *got, /* current extent to shift */ |
| xfs_fileoff_t shift) /* shift fsb */ |
| { |
| xfs_fileoff_t startoff; |
| |
| startoff = got->br_startoff - shift; |
| |
| /* |
| * The extent, once shifted, must be adjacent in-file and on-disk with |
| * the preceding extent. |
| */ |
| if ((left->br_startoff + left->br_blockcount != startoff) || |
| (left->br_startblock + left->br_blockcount != got->br_startblock) || |
| (left->br_state != got->br_state) || |
| (left->br_blockcount + got->br_blockcount > MAXEXTLEN)) |
| return false; |
| |
| return true; |
| } |
| |
| /* |
| * A bmap extent shift adjusts the file offset of an extent to fill a preceding |
| * hole in the file. If an extent shift would result in the extent being fully |
| * adjacent to the extent that currently precedes the hole, we can merge with |
| * the preceding extent rather than do the shift. |
| * |
| * This function assumes the caller has verified a shift-by-merge is possible |
| * with the provided extents via xfs_bmse_can_merge(). |
| */ |
| STATIC int |
| xfs_bmse_merge( |
| struct xfs_inode *ip, |
| int whichfork, |
| xfs_fileoff_t shift, /* shift fsb */ |
| int current_ext, /* idx of gotp */ |
| struct xfs_bmbt_rec_host *gotp, /* extent to shift */ |
| struct xfs_bmbt_rec_host *leftp, /* preceding extent */ |
| struct xfs_btree_cur *cur, |
| int *logflags) /* output */ |
| { |
| struct xfs_bmbt_irec got; |
| struct xfs_bmbt_irec left; |
| xfs_filblks_t blockcount; |
| int error, i; |
| struct xfs_mount *mp = ip->i_mount; |
| |
| xfs_bmbt_get_all(gotp, &got); |
| xfs_bmbt_get_all(leftp, &left); |
| blockcount = left.br_blockcount + got.br_blockcount; |
| |
| ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); |
| ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
| ASSERT(xfs_bmse_can_merge(&left, &got, shift)); |
| |
| /* |
| * Merge the in-core extents. Note that the host record pointers and |
| * current_ext index are invalid once the extent has been removed via |
| * xfs_iext_remove(). |
| */ |
| xfs_bmbt_set_blockcount(leftp, blockcount); |
| xfs_iext_remove(ip, current_ext, 1, 0); |
| |
| /* |
| * Update the on-disk extent count, the btree if necessary and log the |
| * inode. |
| */ |
| XFS_IFORK_NEXT_SET(ip, whichfork, |
| XFS_IFORK_NEXTENTS(ip, whichfork) - 1); |
| *logflags |= XFS_ILOG_CORE; |
| if (!cur) { |
| *logflags |= XFS_ILOG_DEXT; |
| return 0; |
| } |
| |
| /* lookup and remove the extent to merge */ |
| error = xfs_bmbt_lookup_eq(cur, got.br_startoff, got.br_startblock, |
| got.br_blockcount, &i); |
| if (error) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
| |
| error = xfs_btree_delete(cur, &i); |
| if (error) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
| |
| /* lookup and update size of the previous extent */ |
| error = xfs_bmbt_lookup_eq(cur, left.br_startoff, left.br_startblock, |
| left.br_blockcount, &i); |
| if (error) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
| |
| left.br_blockcount = blockcount; |
| |
| return xfs_bmbt_update(cur, left.br_startoff, left.br_startblock, |
| left.br_blockcount, left.br_state); |
| } |
| |
| /* |
| * Shift a single extent. |
| */ |
| STATIC int |
| xfs_bmse_shift_one( |
| struct xfs_inode *ip, |
| int whichfork, |
| xfs_fileoff_t offset_shift_fsb, |
| int *current_ext, |
| struct xfs_bmbt_rec_host *gotp, |
| struct xfs_btree_cur *cur, |
| int *logflags, |
| enum shift_direction direction, |
| struct xfs_defer_ops *dfops) |
| { |
| struct xfs_ifork *ifp; |
| struct xfs_mount *mp; |
| xfs_fileoff_t startoff; |
| struct xfs_bmbt_rec_host *adj_irecp; |
| struct xfs_bmbt_irec got; |
| struct xfs_bmbt_irec adj_irec; |
| int error; |
| int i; |
| int total_extents; |
| |
| mp = ip->i_mount; |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t); |
| |
| xfs_bmbt_get_all(gotp, &got); |
| |
| /* delalloc extents should be prevented by caller */ |
| XFS_WANT_CORRUPTED_RETURN(mp, !isnullstartblock(got.br_startblock)); |
| |
| if (direction == SHIFT_LEFT) { |
| startoff = got.br_startoff - offset_shift_fsb; |
| |
| /* |
| * Check for merge if we've got an extent to the left, |
| * otherwise make sure there's enough room at the start |
| * of the file for the shift. |
| */ |
| if (!*current_ext) { |
| if (got.br_startoff < offset_shift_fsb) |
| return -EINVAL; |
| goto update_current_ext; |
| } |
| /* |
| * grab the left extent and check for a large |
| * enough hole. |
| */ |
| adj_irecp = xfs_iext_get_ext(ifp, *current_ext - 1); |
| xfs_bmbt_get_all(adj_irecp, &adj_irec); |
| |
| if (startoff < |
| adj_irec.br_startoff + adj_irec.br_blockcount) |
| return -EINVAL; |
| |
| /* check whether to merge the extent or shift it down */ |
| if (xfs_bmse_can_merge(&adj_irec, &got, |
| offset_shift_fsb)) { |
| error = xfs_bmse_merge(ip, whichfork, offset_shift_fsb, |
| *current_ext, gotp, adj_irecp, |
| cur, logflags); |
| if (error) |
| return error; |
| adj_irec = got; |
| goto update_rmap; |
| } |
| } else { |
| startoff = got.br_startoff + offset_shift_fsb; |
| /* nothing to move if this is the last extent */ |
| if (*current_ext >= (total_extents - 1)) |
| goto update_current_ext; |
| /* |
| * If this is not the last extent in the file, make sure there |
| * is enough room between current extent and next extent for |
| * accommodating the shift. |
| */ |
| adj_irecp = xfs_iext_get_ext(ifp, *current_ext + 1); |
| xfs_bmbt_get_all(adj_irecp, &adj_irec); |
| if (startoff + got.br_blockcount > adj_irec.br_startoff) |
| return -EINVAL; |
| /* |
| * Unlike a left shift (which involves a hole punch), |
| * a right shift does not modify extent neighbors |
| * in any way. We should never find mergeable extents |
| * in this scenario. Check anyways and warn if we |
| * encounter two extents that could be one. |
| */ |
| if (xfs_bmse_can_merge(&got, &adj_irec, offset_shift_fsb)) |
| WARN_ON_ONCE(1); |
| } |
| /* |
| * Increment the extent index for the next iteration, update the start |
| * offset of the in-core extent and update the btree if applicable. |
| */ |
| update_current_ext: |
| if (direction == SHIFT_LEFT) |
| (*current_ext)++; |
| else |
| (*current_ext)--; |
| xfs_bmbt_set_startoff(gotp, startoff); |
| *logflags |= XFS_ILOG_CORE; |
| adj_irec = got; |
| if (!cur) { |
| *logflags |= XFS_ILOG_DEXT; |
| goto update_rmap; |
| } |
| |
| error = xfs_bmbt_lookup_eq(cur, got.br_startoff, got.br_startblock, |
| got.br_blockcount, &i); |
| if (error) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
| |
| got.br_startoff = startoff; |
| error = xfs_bmbt_update(cur, got.br_startoff, got.br_startblock, |
| got.br_blockcount, got.br_state); |
| if (error) |
| return error; |
| |
| update_rmap: |
| /* update reverse mapping */ |
| error = xfs_rmap_unmap_extent(mp, dfops, ip, whichfork, &adj_irec); |
| if (error) |
| return error; |
| adj_irec.br_startoff = startoff; |
| return xfs_rmap_map_extent(mp, dfops, ip, whichfork, &adj_irec); |
| } |
| |
| /* |
| * Shift extent records to the left/right to cover/create a hole. |
| * |
| * The maximum number of extents to be shifted in a single operation is |
| * @num_exts. @stop_fsb specifies the file offset at which to stop shift and the |
| * file offset where we've left off is returned in @next_fsb. @offset_shift_fsb |
| * is the length by which each extent is shifted. If there is no hole to shift |
| * the extents into, this will be considered invalid operation and we abort |
| * immediately. |
| */ |
| int |
| xfs_bmap_shift_extents( |
| struct xfs_trans *tp, |
| struct xfs_inode *ip, |
| xfs_fileoff_t *next_fsb, |
| xfs_fileoff_t offset_shift_fsb, |
| int *done, |
| xfs_fileoff_t stop_fsb, |
| xfs_fsblock_t *firstblock, |
| struct xfs_defer_ops *dfops, |
| enum shift_direction direction, |
| int num_exts) |
| { |
| struct xfs_btree_cur *cur = NULL; |
| struct xfs_bmbt_rec_host *gotp; |
| struct xfs_bmbt_irec got; |
| struct xfs_mount *mp = ip->i_mount; |
| struct xfs_ifork *ifp; |
| xfs_extnum_t nexts = 0; |
| xfs_extnum_t current_ext; |
| xfs_extnum_t total_extents; |
| xfs_extnum_t stop_extent; |
| int error = 0; |
| int whichfork = XFS_DATA_FORK; |
| int logflags = 0; |
| |
| if (unlikely(XFS_TEST_ERROR( |
| (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE), |
| mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) { |
| XFS_ERROR_REPORT("xfs_bmap_shift_extents", |
| XFS_ERRLEVEL_LOW, mp); |
| return -EFSCORRUPTED; |
| } |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return -EIO; |
| |
| ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); |
| ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
| ASSERT(direction == SHIFT_LEFT || direction == SHIFT_RIGHT); |
| ASSERT(*next_fsb != NULLFSBLOCK || direction == SHIFT_RIGHT); |
| |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| if (!(ifp->if_flags & XFS_IFEXTENTS)) { |
| /* Read in all the extents */ |
| error = xfs_iread_extents(tp, ip, whichfork); |
| if (error) |
| return error; |
| } |
| |
| if (ifp->if_flags & XFS_IFBROOT) { |
| cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); |
| cur->bc_private.b.firstblock = *firstblock; |
| cur->bc_private.b.dfops = dfops; |
| cur->bc_private.b.flags = 0; |
| } |
| |
| /* |
| * There may be delalloc extents in the data fork before the range we |
| * are collapsing out, so we cannot use the count of real extents here. |
| * Instead we have to calculate it from the incore fork. |
| */ |
| total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t); |
| if (total_extents == 0) { |
| *done = 1; |
| goto del_cursor; |
| } |
| |
| /* |
| * In case of first right shift, we need to initialize next_fsb |
| */ |
| if (*next_fsb == NULLFSBLOCK) { |
| gotp = xfs_iext_get_ext(ifp, total_extents - 1); |
| xfs_bmbt_get_all(gotp, &got); |
| *next_fsb = got.br_startoff; |
| if (stop_fsb > *next_fsb) { |
| *done = 1; |
| goto del_cursor; |
| } |
| } |
| |
| /* Lookup the extent index at which we have to stop */ |
| if (direction == SHIFT_RIGHT) { |
| gotp = xfs_iext_bno_to_ext(ifp, stop_fsb, &stop_extent); |
| /* Make stop_extent exclusive of shift range */ |
| stop_extent--; |
| } else |
| stop_extent = total_extents; |
| |
| /* |
| * Look up the extent index for the fsb where we start shifting. We can |
| * henceforth iterate with current_ext as extent list changes are locked |
| * out via ilock. |
| * |
| * gotp can be null in 2 cases: 1) if there are no extents or 2) |
| * *next_fsb lies in a hole beyond which there are no extents. Either |
| * way, we are done. |
| */ |
| gotp = xfs_iext_bno_to_ext(ifp, *next_fsb, ¤t_ext); |
| if (!gotp) { |
| *done = 1; |
| goto del_cursor; |
| } |
| |
| /* some sanity checking before we finally start shifting extents */ |
| if ((direction == SHIFT_LEFT && current_ext >= stop_extent) || |
| (direction == SHIFT_RIGHT && current_ext <= stop_extent)) { |
| error = -EIO; |
| goto del_cursor; |
| } |
| |
| while (nexts++ < num_exts) { |
| error = xfs_bmse_shift_one(ip, whichfork, offset_shift_fsb, |
| ¤t_ext, gotp, cur, &logflags, |
| direction, dfops); |
| if (error) |
| goto del_cursor; |
| /* |
| * If there was an extent merge during the shift, the extent |
| * count can change. Update the total and grade the next record. |
| */ |
| if (direction == SHIFT_LEFT) { |
| total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t); |
| stop_extent = total_extents; |
| } |
| |
| if (current_ext == stop_extent) { |
| *done = 1; |
| *next_fsb = NULLFSBLOCK; |
| break; |
| } |
| gotp = xfs_iext_get_ext(ifp, current_ext); |
| } |
| |
| if (!*done) { |
| xfs_bmbt_get_all(gotp, &got); |
| *next_fsb = got.br_startoff; |
| } |
| |
| del_cursor: |
| if (cur) |
| xfs_btree_del_cursor(cur, |
| error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); |
| |
| if (logflags) |
| xfs_trans_log_inode(tp, ip, logflags); |
| |
| return error; |
| } |
| |
| /* |
| * Splits an extent into two extents at split_fsb block such that it is |
| * the first block of the current_ext. @current_ext is a target extent |
| * to be split. @split_fsb is a block where the extents is split. |
| * If split_fsb lies in a hole or the first block of extents, just return 0. |
| */ |
| STATIC int |
| xfs_bmap_split_extent_at( |
| struct xfs_trans *tp, |
| struct xfs_inode *ip, |
| xfs_fileoff_t split_fsb, |
| xfs_fsblock_t *firstfsb, |
| struct xfs_defer_ops *dfops) |
| { |
| int whichfork = XFS_DATA_FORK; |
| struct xfs_btree_cur *cur = NULL; |
| struct xfs_bmbt_rec_host *gotp; |
| struct xfs_bmbt_irec got; |
| struct xfs_bmbt_irec new; /* split extent */ |
| struct xfs_mount *mp = ip->i_mount; |
| struct xfs_ifork *ifp; |
| xfs_fsblock_t gotblkcnt; /* new block count for got */ |
| xfs_extnum_t current_ext; |
| int error = 0; |
| int logflags = 0; |
| int i = 0; |
| |
| if (unlikely(XFS_TEST_ERROR( |
| (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS && |
| XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE), |
| mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) { |
| XFS_ERROR_REPORT("xfs_bmap_split_extent_at", |
| XFS_ERRLEVEL_LOW, mp); |
| return -EFSCORRUPTED; |
| } |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return -EIO; |
| |
| ifp = XFS_IFORK_PTR(ip, whichfork); |
| if (!(ifp->if_flags & XFS_IFEXTENTS)) { |
| /* Read in all the extents */ |
| error = xfs_iread_extents(tp, ip, whichfork); |
| if (error) |
| return error; |
| } |
| |
| /* |
| * gotp can be null in 2 cases: 1) if there are no extents |
| * or 2) split_fsb lies in a hole beyond which there are |
| * no extents. Either way, we are done. |
| */ |
| gotp = xfs_iext_bno_to_ext(ifp, split_fsb, ¤t_ext); |
| if (!gotp) |
| return 0; |
| |
| xfs_bmbt_get_all(gotp, &got); |
| |
| /* |
| * Check split_fsb lies in a hole or the start boundary offset |
| * of the extent. |
| */ |
| if (got.br_startoff >= split_fsb) |
| return 0; |
| |
| gotblkcnt = split_fsb - got.br_startoff; |
| new.br_startoff = split_fsb; |
| new.br_startblock = got.br_startblock + gotblkcnt; |
| new.br_blockcount = got.br_blockcount - gotblkcnt; |
| new.br_state = got.br_state; |
| |
| if (ifp->if_flags & XFS_IFBROOT) { |
| cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork); |
| cur->bc_private.b.firstblock = *firstfsb; |
| cur->bc_private.b.dfops = dfops; |
| cur->bc_private.b.flags = 0; |
| error = xfs_bmbt_lookup_eq(cur, got.br_startoff, |
| got.br_startblock, |
| got.br_blockcount, |
| &i); |
| if (error) |
| goto del_cursor; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor); |
| } |
| |
| xfs_bmbt_set_blockcount(gotp, gotblkcnt); |
| got.br_blockcount = gotblkcnt; |
| |
| logflags = XFS_ILOG_CORE; |
| if (cur) { |
| error = xfs_bmbt_update(cur, got.br_startoff, |
| got.br_startblock, |
| got.br_blockcount, |
| got.br_state); |
| if (error) |
| goto del_cursor; |
| } else |
| logflags |= XFS_ILOG_DEXT; |
| |
| /* Add new extent */ |
| current_ext++; |
| xfs_iext_insert(ip, current_ext, 1, &new, 0); |
| XFS_IFORK_NEXT_SET(ip, whichfork, |
| XFS_IFORK_NEXTENTS(ip, whichfork) + 1); |
| |
| if (cur) { |
| error = xfs_bmbt_lookup_eq(cur, new.br_startoff, |
| new.br_startblock, new.br_blockcount, |
| &i); |
| if (error) |
| goto del_cursor; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 0, del_cursor); |
| cur->bc_rec.b.br_state = new.br_state; |
| |
| error = xfs_btree_insert(cur, &i); |
| if (error) |
| goto del_cursor; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor); |
| } |
| |
| /* |
| * Convert to a btree if necessary. |
| */ |
| if (xfs_bmap_needs_btree(ip, whichfork)) { |
| int tmp_logflags; /* partial log flag return val */ |
| |
| ASSERT(cur == NULL); |
| error = xfs_bmap_extents_to_btree(tp, ip, firstfsb, dfops, |
| &cur, 0, &tmp_logflags, whichfork); |
| logflags |= tmp_logflags; |
| } |
| |
| del_cursor: |
| if (cur) { |
| cur->bc_private.b.allocated = 0; |
| xfs_btree_del_cursor(cur, |
| error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); |
| } |
| |
| if (logflags) |
| xfs_trans_log_inode(tp, ip, logflags); |
| return error; |
| } |
| |
| int |
| xfs_bmap_split_extent( |
| struct xfs_inode *ip, |
| xfs_fileoff_t split_fsb) |
| { |
| struct xfs_mount *mp = ip->i_mount; |
| struct xfs_trans *tp; |
| struct xfs_defer_ops dfops; |
| xfs_fsblock_t firstfsb; |
| int error; |
| |
| error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, |
| XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, 0, &tp); |
| if (error) |
| return error; |
| |
| xfs_ilock(ip, XFS_ILOCK_EXCL); |
| xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
| |
| xfs_defer_init(&dfops, &firstfsb); |
| |
| error = xfs_bmap_split_extent_at(tp, ip, split_fsb, |
| &firstfsb, &dfops); |
| if (error) |
| goto out; |
| |
| error = xfs_defer_finish(&tp, &dfops, NULL); |
| if (error) |
| goto out; |
| |
| return xfs_trans_commit(tp); |
| |
| out: |
| xfs_defer_cancel(&dfops); |
| xfs_trans_cancel(tp); |
| return error; |
| } |
| |
| /* Deferred mapping is only for real extents in the data fork. */ |
| static bool |
| xfs_bmap_is_update_needed( |
| struct xfs_bmbt_irec *bmap) |
| { |
| return bmap->br_startblock != HOLESTARTBLOCK && |
| bmap->br_startblock != DELAYSTARTBLOCK; |
| } |
| |
| /* Record a bmap intent. */ |
| static int |
| __xfs_bmap_add( |
| struct xfs_mount *mp, |
| struct xfs_defer_ops *dfops, |
| enum xfs_bmap_intent_type type, |
| struct xfs_inode *ip, |
| int whichfork, |
| struct xfs_bmbt_irec *bmap) |
| { |
| int error; |
| struct xfs_bmap_intent *bi; |
| |
| trace_xfs_bmap_defer(mp, |
| XFS_FSB_TO_AGNO(mp, bmap->br_startblock), |
| type, |
| XFS_FSB_TO_AGBNO(mp, bmap->br_startblock), |
| ip->i_ino, whichfork, |
| bmap->br_startoff, |
| bmap->br_blockcount, |
| bmap->br_state); |
| |
| bi = kmem_alloc(sizeof(struct xfs_bmap_intent), KM_SLEEP | KM_NOFS); |
| INIT_LIST_HEAD(&bi->bi_list); |
| bi->bi_type = type; |
| bi->bi_owner = ip; |
| bi->bi_whichfork = whichfork; |
| bi->bi_bmap = *bmap; |
| |
| error = xfs_defer_join(dfops, bi->bi_owner); |
| if (error) { |
| kmem_free(bi); |
| return error; |
| } |
| |
| xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_BMAP, &bi->bi_list); |
| return 0; |
| } |
| |
| /* Map an extent into a file. */ |
| int |
| xfs_bmap_map_extent( |
| struct xfs_mount *mp, |
| struct xfs_defer_ops *dfops, |
| struct xfs_inode *ip, |
| struct xfs_bmbt_irec *PREV) |
| { |
| if (!xfs_bmap_is_update_needed(PREV)) |
| return 0; |
| |
| return __xfs_bmap_add(mp, dfops, XFS_BMAP_MAP, ip, |
| XFS_DATA_FORK, PREV); |
| } |
| |
| /* Unmap an extent out of a file. */ |
| int |
| xfs_bmap_unmap_extent( |
| struct xfs_mount *mp, |
| struct xfs_defer_ops *dfops, |
| struct xfs_inode *ip, |
| struct xfs_bmbt_irec *PREV) |
| { |
| if (!xfs_bmap_is_update_needed(PREV)) |
| return 0; |
| |
| return __xfs_bmap_add(mp, dfops, XFS_BMAP_UNMAP, ip, |
| XFS_DATA_FORK, PREV); |
| } |
| |
| /* |
| * Process one of the deferred bmap operations. We pass back the |
| * btree cursor to maintain our lock on the bmapbt between calls. |
| */ |
| int |
| xfs_bmap_finish_one( |
| struct xfs_trans *tp, |
| struct xfs_defer_ops *dfops, |
| struct xfs_inode *ip, |
| enum xfs_bmap_intent_type type, |
| int whichfork, |
| xfs_fileoff_t startoff, |
| xfs_fsblock_t startblock, |
| xfs_filblks_t blockcount, |
| xfs_exntst_t state) |
| { |
| struct xfs_bmbt_irec bmap; |
| int nimaps = 1; |
| xfs_fsblock_t firstfsb; |
| int flags = XFS_BMAPI_REMAP; |
| int done; |
| int error = 0; |
| |
| bmap.br_startblock = startblock; |
| bmap.br_startoff = startoff; |
| bmap.br_blockcount = blockcount; |
| bmap.br_state = state; |
| |
| trace_xfs_bmap_deferred(tp->t_mountp, |
| XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type, |
| XFS_FSB_TO_AGBNO(tp->t_mountp, startblock), |
| ip->i_ino, whichfork, startoff, blockcount, state); |
| |
| if (whichfork != XFS_DATA_FORK && whichfork != XFS_ATTR_FORK) |
| return -EFSCORRUPTED; |
| if (whichfork == XFS_ATTR_FORK) |
| flags |= XFS_BMAPI_ATTRFORK; |
| |
| if (XFS_TEST_ERROR(false, tp->t_mountp, |
| XFS_ERRTAG_BMAP_FINISH_ONE, |
| XFS_RANDOM_BMAP_FINISH_ONE)) |
| return -EIO; |
| |
| switch (type) { |
| case XFS_BMAP_MAP: |
| firstfsb = bmap.br_startblock; |
| error = xfs_bmapi_write(tp, ip, bmap.br_startoff, |
| bmap.br_blockcount, flags, &firstfsb, |
| bmap.br_blockcount, &bmap, &nimaps, |
| dfops); |
| break; |
| case XFS_BMAP_UNMAP: |
| error = xfs_bunmapi(tp, ip, bmap.br_startoff, |
| bmap.br_blockcount, flags, 1, &firstfsb, |
| dfops, &done); |
| ASSERT(done); |
| break; |
| default: |
| ASSERT(0); |
| error = -EFSCORRUPTED; |
| } |
| |
| return error; |
| } |
