| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_format.h" |
| #include "xfs_log_format.h" |
| #include "xfs_shared.h" |
| #include "xfs_trans_resv.h" |
| #include "xfs_bit.h" |
| #include "xfs_sb.h" |
| #include "xfs_mount.h" |
| #include "xfs_defer.h" |
| #include "xfs_inode.h" |
| #include "xfs_btree.h" |
| #include "xfs_rmap.h" |
| #include "xfs_alloc_btree.h" |
| #include "xfs_alloc.h" |
| #include "xfs_extent_busy.h" |
| #include "xfs_errortag.h" |
| #include "xfs_error.h" |
| #include "xfs_cksum.h" |
| #include "xfs_trace.h" |
| #include "xfs_trans.h" |
| #include "xfs_buf_item.h" |
| #include "xfs_log.h" |
| #include "xfs_ag_resv.h" |
| #include "xfs_bmap.h" |
| |
| extern kmem_zone_t *xfs_bmap_free_item_zone; |
| |
| struct workqueue_struct *xfs_alloc_wq; |
| |
| #define XFS_ABSDIFF(a,b) (((a) <= (b)) ? ((b) - (a)) : ((a) - (b))) |
| |
| #define XFSA_FIXUP_BNO_OK 1 |
| #define XFSA_FIXUP_CNT_OK 2 |
| |
| STATIC int xfs_alloc_ag_vextent_exact(xfs_alloc_arg_t *); |
| STATIC int xfs_alloc_ag_vextent_near(xfs_alloc_arg_t *); |
| STATIC int xfs_alloc_ag_vextent_size(xfs_alloc_arg_t *); |
| STATIC int xfs_alloc_ag_vextent_small(xfs_alloc_arg_t *, |
| xfs_btree_cur_t *, xfs_agblock_t *, xfs_extlen_t *, int *); |
| |
| /* |
| * Size of the AGFL. For CRC-enabled filesystes we steal a couple of slots in |
| * the beginning of the block for a proper header with the location information |
| * and CRC. |
| */ |
| unsigned int |
| xfs_agfl_size( |
| struct xfs_mount *mp) |
| { |
| unsigned int size = mp->m_sb.sb_sectsize; |
| |
| if (xfs_sb_version_hascrc(&mp->m_sb)) |
| size -= sizeof(struct xfs_agfl); |
| |
| return size / sizeof(xfs_agblock_t); |
| } |
| |
| unsigned int |
| xfs_refc_block( |
| struct xfs_mount *mp) |
| { |
| if (xfs_sb_version_hasrmapbt(&mp->m_sb)) |
| return XFS_RMAP_BLOCK(mp) + 1; |
| if (xfs_sb_version_hasfinobt(&mp->m_sb)) |
| return XFS_FIBT_BLOCK(mp) + 1; |
| return XFS_IBT_BLOCK(mp) + 1; |
| } |
| |
| xfs_extlen_t |
| xfs_prealloc_blocks( |
| struct xfs_mount *mp) |
| { |
| if (xfs_sb_version_hasreflink(&mp->m_sb)) |
| return xfs_refc_block(mp) + 1; |
| if (xfs_sb_version_hasrmapbt(&mp->m_sb)) |
| return XFS_RMAP_BLOCK(mp) + 1; |
| if (xfs_sb_version_hasfinobt(&mp->m_sb)) |
| return XFS_FIBT_BLOCK(mp) + 1; |
| return XFS_IBT_BLOCK(mp) + 1; |
| } |
| |
| /* |
| * In order to avoid ENOSPC-related deadlock caused by out-of-order locking of |
| * AGF buffer (PV 947395), we place constraints on the relationship among |
| * actual allocations for data blocks, freelist blocks, and potential file data |
| * bmap btree blocks. However, these restrictions may result in no actual space |
| * allocated for a delayed extent, for example, a data block in a certain AG is |
| * allocated but there is no additional block for the additional bmap btree |
| * block due to a split of the bmap btree of the file. The result of this may |
| * lead to an infinite loop when the file gets flushed to disk and all delayed |
| * extents need to be actually allocated. To get around this, we explicitly set |
| * aside a few blocks which will not be reserved in delayed allocation. |
| * |
| * We need to reserve 4 fsbs _per AG_ for the freelist and 4 more to handle a |
| * potential split of the file's bmap btree. |
| */ |
| unsigned int |
| xfs_alloc_set_aside( |
| struct xfs_mount *mp) |
| { |
| return mp->m_sb.sb_agcount * (XFS_ALLOC_AGFL_RESERVE + 4); |
| } |
| |
| /* |
| * When deciding how much space to allocate out of an AG, we limit the |
| * allocation maximum size to the size the AG. However, we cannot use all the |
| * blocks in the AG - some are permanently used by metadata. These |
| * blocks are generally: |
| * - the AG superblock, AGF, AGI and AGFL |
| * - the AGF (bno and cnt) and AGI btree root blocks, and optionally |
| * the AGI free inode and rmap btree root blocks. |
| * - blocks on the AGFL according to xfs_alloc_set_aside() limits |
| * - the rmapbt root block |
| * |
| * The AG headers are sector sized, so the amount of space they take up is |
| * dependent on filesystem geometry. The others are all single blocks. |
| */ |
| unsigned int |
| xfs_alloc_ag_max_usable( |
| struct xfs_mount *mp) |
| { |
| unsigned int blocks; |
| |
| blocks = XFS_BB_TO_FSB(mp, XFS_FSS_TO_BB(mp, 4)); /* ag headers */ |
| blocks += XFS_ALLOC_AGFL_RESERVE; |
| blocks += 3; /* AGF, AGI btree root blocks */ |
| if (xfs_sb_version_hasfinobt(&mp->m_sb)) |
| blocks++; /* finobt root block */ |
| if (xfs_sb_version_hasrmapbt(&mp->m_sb)) |
| blocks++; /* rmap root block */ |
| if (xfs_sb_version_hasreflink(&mp->m_sb)) |
| blocks++; /* refcount root block */ |
| |
| return mp->m_sb.sb_agblocks - blocks; |
| } |
| |
| /* |
| * Lookup the record equal to [bno, len] in the btree given by cur. |
| */ |
| STATIC int /* error */ |
| xfs_alloc_lookup_eq( |
| struct xfs_btree_cur *cur, /* btree cursor */ |
| xfs_agblock_t bno, /* starting block of extent */ |
| xfs_extlen_t len, /* length of extent */ |
| int *stat) /* success/failure */ |
| { |
| cur->bc_rec.a.ar_startblock = bno; |
| cur->bc_rec.a.ar_blockcount = len; |
| return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat); |
| } |
| |
| /* |
| * Lookup the first record greater than or equal to [bno, len] |
| * in the btree given by cur. |
| */ |
| int /* error */ |
| xfs_alloc_lookup_ge( |
| struct xfs_btree_cur *cur, /* btree cursor */ |
| xfs_agblock_t bno, /* starting block of extent */ |
| xfs_extlen_t len, /* length of extent */ |
| int *stat) /* success/failure */ |
| { |
| cur->bc_rec.a.ar_startblock = bno; |
| cur->bc_rec.a.ar_blockcount = len; |
| return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat); |
| } |
| |
| /* |
| * Lookup the first record less than or equal to [bno, len] |
| * in the btree given by cur. |
| */ |
| int /* error */ |
| xfs_alloc_lookup_le( |
| struct xfs_btree_cur *cur, /* btree cursor */ |
| xfs_agblock_t bno, /* starting block of extent */ |
| xfs_extlen_t len, /* length of extent */ |
| int *stat) /* success/failure */ |
| { |
| cur->bc_rec.a.ar_startblock = bno; |
| cur->bc_rec.a.ar_blockcount = len; |
| return xfs_btree_lookup(cur, XFS_LOOKUP_LE, stat); |
| } |
| |
| /* |
| * Update the record referred to by cur to the value given |
| * by [bno, len]. |
| * This either works (return 0) or gets an EFSCORRUPTED error. |
| */ |
| STATIC int /* error */ |
| xfs_alloc_update( |
| struct xfs_btree_cur *cur, /* btree cursor */ |
| xfs_agblock_t bno, /* starting block of extent */ |
| xfs_extlen_t len) /* length of extent */ |
| { |
| union xfs_btree_rec rec; |
| |
| rec.alloc.ar_startblock = cpu_to_be32(bno); |
| rec.alloc.ar_blockcount = cpu_to_be32(len); |
| return xfs_btree_update(cur, &rec); |
| } |
| |
| /* |
| * Get the data from the pointed-to record. |
| */ |
| int /* error */ |
| xfs_alloc_get_rec( |
| struct xfs_btree_cur *cur, /* btree cursor */ |
| xfs_agblock_t *bno, /* output: starting block of extent */ |
| xfs_extlen_t *len, /* output: length of extent */ |
| int *stat) /* output: success/failure */ |
| { |
| struct xfs_mount *mp = cur->bc_mp; |
| xfs_agnumber_t agno = cur->bc_private.a.agno; |
| union xfs_btree_rec *rec; |
| int error; |
| |
| error = xfs_btree_get_rec(cur, &rec, stat); |
| if (error || !(*stat)) |
| return error; |
| |
| *bno = be32_to_cpu(rec->alloc.ar_startblock); |
| *len = be32_to_cpu(rec->alloc.ar_blockcount); |
| |
| if (*len == 0) |
| goto out_bad_rec; |
| |
| /* check for valid extent range, including overflow */ |
| if (!xfs_verify_agbno(mp, agno, *bno)) |
| goto out_bad_rec; |
| if (*bno > *bno + *len) |
| goto out_bad_rec; |
| if (!xfs_verify_agbno(mp, agno, *bno + *len - 1)) |
| goto out_bad_rec; |
| |
| return 0; |
| |
| out_bad_rec: |
| xfs_warn(mp, |
| "%s Freespace BTree record corruption in AG %d detected!", |
| cur->bc_btnum == XFS_BTNUM_BNO ? "Block" : "Size", agno); |
| xfs_warn(mp, |
| "start block 0x%x block count 0x%x", *bno, *len); |
| return -EFSCORRUPTED; |
| } |
| |
| /* |
| * Compute aligned version of the found extent. |
| * Takes alignment and min length into account. |
| */ |
| STATIC bool |
| xfs_alloc_compute_aligned( |
| xfs_alloc_arg_t *args, /* allocation argument structure */ |
| xfs_agblock_t foundbno, /* starting block in found extent */ |
| xfs_extlen_t foundlen, /* length in found extent */ |
| xfs_agblock_t *resbno, /* result block number */ |
| xfs_extlen_t *reslen, /* result length */ |
| unsigned *busy_gen) |
| { |
| xfs_agblock_t bno = foundbno; |
| xfs_extlen_t len = foundlen; |
| xfs_extlen_t diff; |
| bool busy; |
| |
| /* Trim busy sections out of found extent */ |
| busy = xfs_extent_busy_trim(args, &bno, &len, busy_gen); |
| |
| /* |
| * If we have a largish extent that happens to start before min_agbno, |
| * see if we can shift it into range... |
| */ |
| if (bno < args->min_agbno && bno + len > args->min_agbno) { |
| diff = args->min_agbno - bno; |
| if (len > diff) { |
| bno += diff; |
| len -= diff; |
| } |
| } |
| |
| if (args->alignment > 1 && len >= args->minlen) { |
| xfs_agblock_t aligned_bno = roundup(bno, args->alignment); |
| |
| diff = aligned_bno - bno; |
| |
| *resbno = aligned_bno; |
| *reslen = diff >= len ? 0 : len - diff; |
| } else { |
| *resbno = bno; |
| *reslen = len; |
| } |
| |
| return busy; |
| } |
| |
| /* |
| * Compute best start block and diff for "near" allocations. |
| * freelen >= wantlen already checked by caller. |
| */ |
| STATIC xfs_extlen_t /* difference value (absolute) */ |
| xfs_alloc_compute_diff( |
| xfs_agblock_t wantbno, /* target starting block */ |
| xfs_extlen_t wantlen, /* target length */ |
| xfs_extlen_t alignment, /* target alignment */ |
| int datatype, /* are we allocating data? */ |
| xfs_agblock_t freebno, /* freespace's starting block */ |
| xfs_extlen_t freelen, /* freespace's length */ |
| xfs_agblock_t *newbnop) /* result: best start block from free */ |
| { |
| xfs_agblock_t freeend; /* end of freespace extent */ |
| xfs_agblock_t newbno1; /* return block number */ |
| xfs_agblock_t newbno2; /* other new block number */ |
| xfs_extlen_t newlen1=0; /* length with newbno1 */ |
| xfs_extlen_t newlen2=0; /* length with newbno2 */ |
| xfs_agblock_t wantend; /* end of target extent */ |
| bool userdata = xfs_alloc_is_userdata(datatype); |
| |
| ASSERT(freelen >= wantlen); |
| freeend = freebno + freelen; |
| wantend = wantbno + wantlen; |
| /* |
| * We want to allocate from the start of a free extent if it is past |
| * the desired block or if we are allocating user data and the free |
| * extent is before desired block. The second case is there to allow |
| * for contiguous allocation from the remaining free space if the file |
| * grows in the short term. |
| */ |
| if (freebno >= wantbno || (userdata && freeend < wantend)) { |
| if ((newbno1 = roundup(freebno, alignment)) >= freeend) |
| newbno1 = NULLAGBLOCK; |
| } else if (freeend >= wantend && alignment > 1) { |
| newbno1 = roundup(wantbno, alignment); |
| newbno2 = newbno1 - alignment; |
| if (newbno1 >= freeend) |
| newbno1 = NULLAGBLOCK; |
| else |
| newlen1 = XFS_EXTLEN_MIN(wantlen, freeend - newbno1); |
| if (newbno2 < freebno) |
| newbno2 = NULLAGBLOCK; |
| else |
| newlen2 = XFS_EXTLEN_MIN(wantlen, freeend - newbno2); |
| if (newbno1 != NULLAGBLOCK && newbno2 != NULLAGBLOCK) { |
| if (newlen1 < newlen2 || |
| (newlen1 == newlen2 && |
| XFS_ABSDIFF(newbno1, wantbno) > |
| XFS_ABSDIFF(newbno2, wantbno))) |
| newbno1 = newbno2; |
| } else if (newbno2 != NULLAGBLOCK) |
| newbno1 = newbno2; |
| } else if (freeend >= wantend) { |
| newbno1 = wantbno; |
| } else if (alignment > 1) { |
| newbno1 = roundup(freeend - wantlen, alignment); |
| if (newbno1 > freeend - wantlen && |
| newbno1 - alignment >= freebno) |
| newbno1 -= alignment; |
| else if (newbno1 >= freeend) |
| newbno1 = NULLAGBLOCK; |
| } else |
| newbno1 = freeend - wantlen; |
| *newbnop = newbno1; |
| return newbno1 == NULLAGBLOCK ? 0 : XFS_ABSDIFF(newbno1, wantbno); |
| } |
| |
| /* |
| * Fix up the length, based on mod and prod. |
| * len should be k * prod + mod for some k. |
| * If len is too small it is returned unchanged. |
| * If len hits maxlen it is left alone. |
| */ |
| STATIC void |
| xfs_alloc_fix_len( |
| xfs_alloc_arg_t *args) /* allocation argument structure */ |
| { |
| xfs_extlen_t k; |
| xfs_extlen_t rlen; |
| |
| ASSERT(args->mod < args->prod); |
| rlen = args->len; |
| ASSERT(rlen >= args->minlen); |
| ASSERT(rlen <= args->maxlen); |
| if (args->prod <= 1 || rlen < args->mod || rlen == args->maxlen || |
| (args->mod == 0 && rlen < args->prod)) |
| return; |
| k = rlen % args->prod; |
| if (k == args->mod) |
| return; |
| if (k > args->mod) |
| rlen = rlen - (k - args->mod); |
| else |
| rlen = rlen - args->prod + (args->mod - k); |
| /* casts to (int) catch length underflows */ |
| if ((int)rlen < (int)args->minlen) |
| return; |
| ASSERT(rlen >= args->minlen && rlen <= args->maxlen); |
| ASSERT(rlen % args->prod == args->mod); |
| ASSERT(args->pag->pagf_freeblks + args->pag->pagf_flcount >= |
| rlen + args->minleft); |
| args->len = rlen; |
| } |
| |
| /* |
| * Update the two btrees, logically removing from freespace the extent |
| * starting at rbno, rlen blocks. The extent is contained within the |
| * actual (current) free extent fbno for flen blocks. |
| * Flags are passed in indicating whether the cursors are set to the |
| * relevant records. |
| */ |
| STATIC int /* error code */ |
| xfs_alloc_fixup_trees( |
| xfs_btree_cur_t *cnt_cur, /* cursor for by-size btree */ |
| xfs_btree_cur_t *bno_cur, /* cursor for by-block btree */ |
| xfs_agblock_t fbno, /* starting block of free extent */ |
| xfs_extlen_t flen, /* length of free extent */ |
| xfs_agblock_t rbno, /* starting block of returned extent */ |
| xfs_extlen_t rlen, /* length of returned extent */ |
| int flags) /* flags, XFSA_FIXUP_... */ |
| { |
| int error; /* error code */ |
| int i; /* operation results */ |
| xfs_agblock_t nfbno1; /* first new free startblock */ |
| xfs_agblock_t nfbno2; /* second new free startblock */ |
| xfs_extlen_t nflen1=0; /* first new free length */ |
| xfs_extlen_t nflen2=0; /* second new free length */ |
| struct xfs_mount *mp; |
| |
| mp = cnt_cur->bc_mp; |
| |
| /* |
| * Look up the record in the by-size tree if necessary. |
| */ |
| if (flags & XFSA_FIXUP_CNT_OK) { |
| #ifdef DEBUG |
| if ((error = xfs_alloc_get_rec(cnt_cur, &nfbno1, &nflen1, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, |
| i == 1 && nfbno1 == fbno && nflen1 == flen); |
| #endif |
| } else { |
| if ((error = xfs_alloc_lookup_eq(cnt_cur, fbno, flen, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
| } |
| /* |
| * Look up the record in the by-block tree if necessary. |
| */ |
| if (flags & XFSA_FIXUP_BNO_OK) { |
| #ifdef DEBUG |
| if ((error = xfs_alloc_get_rec(bno_cur, &nfbno1, &nflen1, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, |
| i == 1 && nfbno1 == fbno && nflen1 == flen); |
| #endif |
| } else { |
| if ((error = xfs_alloc_lookup_eq(bno_cur, fbno, flen, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
| } |
| |
| #ifdef DEBUG |
| if (bno_cur->bc_nlevels == 1 && cnt_cur->bc_nlevels == 1) { |
| struct xfs_btree_block *bnoblock; |
| struct xfs_btree_block *cntblock; |
| |
| bnoblock = XFS_BUF_TO_BLOCK(bno_cur->bc_bufs[0]); |
| cntblock = XFS_BUF_TO_BLOCK(cnt_cur->bc_bufs[0]); |
| |
| XFS_WANT_CORRUPTED_RETURN(mp, |
| bnoblock->bb_numrecs == cntblock->bb_numrecs); |
| } |
| #endif |
| |
| /* |
| * Deal with all four cases: the allocated record is contained |
| * within the freespace record, so we can have new freespace |
| * at either (or both) end, or no freespace remaining. |
| */ |
| if (rbno == fbno && rlen == flen) |
| nfbno1 = nfbno2 = NULLAGBLOCK; |
| else if (rbno == fbno) { |
| nfbno1 = rbno + rlen; |
| nflen1 = flen - rlen; |
| nfbno2 = NULLAGBLOCK; |
| } else if (rbno + rlen == fbno + flen) { |
| nfbno1 = fbno; |
| nflen1 = flen - rlen; |
| nfbno2 = NULLAGBLOCK; |
| } else { |
| nfbno1 = fbno; |
| nflen1 = rbno - fbno; |
| nfbno2 = rbno + rlen; |
| nflen2 = (fbno + flen) - nfbno2; |
| } |
| /* |
| * Delete the entry from the by-size btree. |
| */ |
| if ((error = xfs_btree_delete(cnt_cur, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
| /* |
| * Add new by-size btree entry(s). |
| */ |
| if (nfbno1 != NULLAGBLOCK) { |
| if ((error = xfs_alloc_lookup_eq(cnt_cur, nfbno1, nflen1, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 0); |
| if ((error = xfs_btree_insert(cnt_cur, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
| } |
| if (nfbno2 != NULLAGBLOCK) { |
| if ((error = xfs_alloc_lookup_eq(cnt_cur, nfbno2, nflen2, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 0); |
| if ((error = xfs_btree_insert(cnt_cur, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
| } |
| /* |
| * Fix up the by-block btree entry(s). |
| */ |
| if (nfbno1 == NULLAGBLOCK) { |
| /* |
| * No remaining freespace, just delete the by-block tree entry. |
| */ |
| if ((error = xfs_btree_delete(bno_cur, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
| } else { |
| /* |
| * Update the by-block entry to start later|be shorter. |
| */ |
| if ((error = xfs_alloc_update(bno_cur, nfbno1, nflen1))) |
| return error; |
| } |
| if (nfbno2 != NULLAGBLOCK) { |
| /* |
| * 2 resulting free entries, need to add one. |
| */ |
| if ((error = xfs_alloc_lookup_eq(bno_cur, nfbno2, nflen2, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 0); |
| if ((error = xfs_btree_insert(bno_cur, &i))) |
| return error; |
| XFS_WANT_CORRUPTED_RETURN(mp, i == 1); |
| } |
| return 0; |
| } |
| |
| static xfs_failaddr_t |
| xfs_agfl_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp); |
| int i; |
| |
| /* |
| * There is no verification of non-crc AGFLs because mkfs does not |
| * initialise the AGFL to zero or NULL. Hence the only valid part of the |
| * AGFL is what the AGF says is active. We can't get to the AGF, so we |
| * can't verify just those entries are valid. |
| */ |
| if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| return NULL; |
| |
| if (!xfs_verify_magic(bp, agfl->agfl_magicnum)) |
| return __this_address; |
| if (!uuid_equal(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid)) |
| return __this_address; |
| /* |
| * during growfs operations, the perag is not fully initialised, |
| * so we can't use it for any useful checking. growfs ensures we can't |
| * use it by using uncached buffers that don't have the perag attached |
| * so we can detect and avoid this problem. |
| */ |
| if (bp->b_pag && be32_to_cpu(agfl->agfl_seqno) != bp->b_pag->pag_agno) |
| return __this_address; |
| |
| for (i = 0; i < xfs_agfl_size(mp); i++) { |
| if (be32_to_cpu(agfl->agfl_bno[i]) != NULLAGBLOCK && |
| be32_to_cpu(agfl->agfl_bno[i]) >= mp->m_sb.sb_agblocks) |
| return __this_address; |
| } |
| |
| if (!xfs_log_check_lsn(mp, be64_to_cpu(XFS_BUF_TO_AGFL(bp)->agfl_lsn))) |
| return __this_address; |
| return NULL; |
| } |
| |
| static void |
| xfs_agfl_read_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| xfs_failaddr_t fa; |
| |
| /* |
| * There is no verification of non-crc AGFLs because mkfs does not |
| * initialise the AGFL to zero or NULL. Hence the only valid part of the |
| * AGFL is what the AGF says is active. We can't get to the AGF, so we |
| * can't verify just those entries are valid. |
| */ |
| if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| return; |
| |
| if (!xfs_buf_verify_cksum(bp, XFS_AGFL_CRC_OFF)) |
| xfs_verifier_error(bp, -EFSBADCRC, __this_address); |
| else { |
| fa = xfs_agfl_verify(bp); |
| if (fa) |
| xfs_verifier_error(bp, -EFSCORRUPTED, fa); |
| } |
| } |
| |
| static void |
| xfs_agfl_write_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| struct xfs_buf_log_item *bip = bp->b_log_item; |
| xfs_failaddr_t fa; |
| |
| /* no verification of non-crc AGFLs */ |
| if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| return; |
| |
| fa = xfs_agfl_verify(bp); |
| if (fa) { |
| xfs_verifier_error(bp, -EFSCORRUPTED, fa); |
| return; |
| } |
| |
| if (bip) |
| XFS_BUF_TO_AGFL(bp)->agfl_lsn = cpu_to_be64(bip->bli_item.li_lsn); |
| |
| xfs_buf_update_cksum(bp, XFS_AGFL_CRC_OFF); |
| } |
| |
| const struct xfs_buf_ops xfs_agfl_buf_ops = { |
| .name = "xfs_agfl", |
| .magic = { cpu_to_be32(XFS_AGFL_MAGIC), cpu_to_be32(XFS_AGFL_MAGIC) }, |
| .verify_read = xfs_agfl_read_verify, |
| .verify_write = xfs_agfl_write_verify, |
| .verify_struct = xfs_agfl_verify, |
| }; |
| |
| /* |
| * Read in the allocation group free block array. |
| */ |
| int /* error */ |
| xfs_alloc_read_agfl( |
| xfs_mount_t *mp, /* mount point structure */ |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_agnumber_t agno, /* allocation group number */ |
| xfs_buf_t **bpp) /* buffer for the ag free block array */ |
| { |
| xfs_buf_t *bp; /* return value */ |
| int error; |
| |
| ASSERT(agno != NULLAGNUMBER); |
| error = xfs_trans_read_buf( |
| mp, tp, mp->m_ddev_targp, |
| XFS_AG_DADDR(mp, agno, XFS_AGFL_DADDR(mp)), |
| XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_agfl_buf_ops); |
| if (error) |
| return error; |
| xfs_buf_set_ref(bp, XFS_AGFL_REF); |
| *bpp = bp; |
| return 0; |
| } |
| |
| STATIC int |
| xfs_alloc_update_counters( |
| struct xfs_trans *tp, |
| struct xfs_perag *pag, |
| struct xfs_buf *agbp, |
| long len) |
| { |
| struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); |
| |
| pag->pagf_freeblks += len; |
| be32_add_cpu(&agf->agf_freeblks, len); |
| |
| xfs_trans_agblocks_delta(tp, len); |
| if (unlikely(be32_to_cpu(agf->agf_freeblks) > |
| be32_to_cpu(agf->agf_length))) |
| return -EFSCORRUPTED; |
| |
| xfs_alloc_log_agf(tp, agbp, XFS_AGF_FREEBLKS); |
| return 0; |
| } |
| |
| /* |
| * Allocation group level functions. |
| */ |
| |
| /* |
| * Allocate a variable extent in the allocation group agno. |
| * Type and bno are used to determine where in the allocation group the |
| * extent will start. |
| * Extent's length (returned in *len) will be between minlen and maxlen, |
| * and of the form k * prod + mod unless there's nothing that large. |
| * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. |
| */ |
| STATIC int /* error */ |
| xfs_alloc_ag_vextent( |
| xfs_alloc_arg_t *args) /* argument structure for allocation */ |
| { |
| int error=0; |
| |
| ASSERT(args->minlen > 0); |
| ASSERT(args->maxlen > 0); |
| ASSERT(args->minlen <= args->maxlen); |
| ASSERT(args->mod < args->prod); |
| ASSERT(args->alignment > 0); |
| |
| /* |
| * Branch to correct routine based on the type. |
| */ |
| args->wasfromfl = 0; |
| switch (args->type) { |
| case XFS_ALLOCTYPE_THIS_AG: |
| error = xfs_alloc_ag_vextent_size(args); |
| break; |
| case XFS_ALLOCTYPE_NEAR_BNO: |
| error = xfs_alloc_ag_vextent_near(args); |
| break; |
| case XFS_ALLOCTYPE_THIS_BNO: |
| error = xfs_alloc_ag_vextent_exact(args); |
| break; |
| default: |
| ASSERT(0); |
| /* NOTREACHED */ |
| } |
| |
| if (error || args->agbno == NULLAGBLOCK) |
| return error; |
| |
| ASSERT(args->len >= args->minlen); |
| ASSERT(args->len <= args->maxlen); |
| ASSERT(!args->wasfromfl || args->resv != XFS_AG_RESV_AGFL); |
| ASSERT(args->agbno % args->alignment == 0); |
| |
| /* if not file data, insert new block into the reverse map btree */ |
| if (!xfs_rmap_should_skip_owner_update(&args->oinfo)) { |
| error = xfs_rmap_alloc(args->tp, args->agbp, args->agno, |
| args->agbno, args->len, &args->oinfo); |
| if (error) |
| return error; |
| } |
| |
| if (!args->wasfromfl) { |
| error = xfs_alloc_update_counters(args->tp, args->pag, |
| args->agbp, |
| -((long)(args->len))); |
| if (error) |
| return error; |
| |
| ASSERT(!xfs_extent_busy_search(args->mp, args->agno, |
| args->agbno, args->len)); |
| } |
| |
| xfs_ag_resv_alloc_extent(args->pag, args->resv, args); |
| |
| XFS_STATS_INC(args->mp, xs_allocx); |
| XFS_STATS_ADD(args->mp, xs_allocb, args->len); |
| return error; |
| } |
| |
| /* |
| * Allocate a variable extent at exactly agno/bno. |
| * Extent's length (returned in *len) will be between minlen and maxlen, |
| * and of the form k * prod + mod unless there's nothing that large. |
| * Return the starting a.g. block (bno), or NULLAGBLOCK if we can't do it. |
| */ |
| STATIC int /* error */ |
| xfs_alloc_ag_vextent_exact( |
| xfs_alloc_arg_t *args) /* allocation argument structure */ |
| { |
| xfs_btree_cur_t *bno_cur;/* by block-number btree cursor */ |
| xfs_btree_cur_t *cnt_cur;/* by count btree cursor */ |
| int error; |
| xfs_agblock_t fbno; /* start block of found extent */ |
| xfs_extlen_t flen; /* length of found extent */ |
| xfs_agblock_t tbno; /* start block of busy extent */ |
| xfs_extlen_t tlen; /* length of busy extent */ |
| xfs_agblock_t tend; /* end block of busy extent */ |
| int i; /* success/failure of operation */ |
| unsigned busy_gen; |
| |
| ASSERT(args->alignment == 1); |
| |
| /* |
| * Allocate/initialize a cursor for the by-number freespace btree. |
| */ |
| bno_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
| args->agno, XFS_BTNUM_BNO); |
| |
| /* |
| * Lookup bno and minlen in the btree (minlen is irrelevant, really). |
| * Look for the closest free block <= bno, it must contain bno |
| * if any free block does. |
| */ |
| error = xfs_alloc_lookup_le(bno_cur, args->agbno, args->minlen, &i); |
| if (error) |
| goto error0; |
| if (!i) |
| goto not_found; |
| |
| /* |
| * Grab the freespace record. |
| */ |
| error = xfs_alloc_get_rec(bno_cur, &fbno, &flen, &i); |
| if (error) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
| ASSERT(fbno <= args->agbno); |
| |
| /* |
| * Check for overlapping busy extents. |
| */ |
| tbno = fbno; |
| tlen = flen; |
| xfs_extent_busy_trim(args, &tbno, &tlen, &busy_gen); |
| |
| /* |
| * Give up if the start of the extent is busy, or the freespace isn't |
| * long enough for the minimum request. |
| */ |
| if (tbno > args->agbno) |
| goto not_found; |
| if (tlen < args->minlen) |
| goto not_found; |
| tend = tbno + tlen; |
| if (tend < args->agbno + args->minlen) |
| goto not_found; |
| |
| /* |
| * End of extent will be smaller of the freespace end and the |
| * maximal requested end. |
| * |
| * Fix the length according to mod and prod if given. |
| */ |
| args->len = XFS_AGBLOCK_MIN(tend, args->agbno + args->maxlen) |
| - args->agbno; |
| xfs_alloc_fix_len(args); |
| ASSERT(args->agbno + args->len <= tend); |
| |
| /* |
| * We are allocating agbno for args->len |
| * Allocate/initialize a cursor for the by-size btree. |
| */ |
| cnt_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
| args->agno, XFS_BTNUM_CNT); |
| ASSERT(args->agbno + args->len <= |
| be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length)); |
| error = xfs_alloc_fixup_trees(cnt_cur, bno_cur, fbno, flen, args->agbno, |
| args->len, XFSA_FIXUP_BNO_OK); |
| if (error) { |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); |
| goto error0; |
| } |
| |
| xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
| |
| args->wasfromfl = 0; |
| trace_xfs_alloc_exact_done(args); |
| return 0; |
| |
| not_found: |
| /* Didn't find it, return null. */ |
| xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); |
| args->agbno = NULLAGBLOCK; |
| trace_xfs_alloc_exact_notfound(args); |
| return 0; |
| |
| error0: |
| xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); |
| trace_xfs_alloc_exact_error(args); |
| return error; |
| } |
| |
| /* |
| * Search the btree in a given direction via the search cursor and compare |
| * the records found against the good extent we've already found. |
| */ |
| STATIC int |
| xfs_alloc_find_best_extent( |
| struct xfs_alloc_arg *args, /* allocation argument structure */ |
| struct xfs_btree_cur **gcur, /* good cursor */ |
| struct xfs_btree_cur **scur, /* searching cursor */ |
| xfs_agblock_t gdiff, /* difference for search comparison */ |
| xfs_agblock_t *sbno, /* extent found by search */ |
| xfs_extlen_t *slen, /* extent length */ |
| xfs_agblock_t *sbnoa, /* aligned extent found by search */ |
| xfs_extlen_t *slena, /* aligned extent length */ |
| int dir) /* 0 = search right, 1 = search left */ |
| { |
| xfs_agblock_t new; |
| xfs_agblock_t sdiff; |
| int error; |
| int i; |
| unsigned busy_gen; |
| |
| /* The good extent is perfect, no need to search. */ |
| if (!gdiff) |
| goto out_use_good; |
| |
| /* |
| * Look until we find a better one, run out of space or run off the end. |
| */ |
| do { |
| error = xfs_alloc_get_rec(*scur, sbno, slen, &i); |
| if (error) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
| xfs_alloc_compute_aligned(args, *sbno, *slen, |
| sbnoa, slena, &busy_gen); |
| |
| /* |
| * The good extent is closer than this one. |
| */ |
| if (!dir) { |
| if (*sbnoa > args->max_agbno) |
| goto out_use_good; |
| if (*sbnoa >= args->agbno + gdiff) |
| goto out_use_good; |
| } else { |
| if (*sbnoa < args->min_agbno) |
| goto out_use_good; |
| if (*sbnoa <= args->agbno - gdiff) |
| goto out_use_good; |
| } |
| |
| /* |
| * Same distance, compare length and pick the best. |
| */ |
| if (*slena >= args->minlen) { |
| args->len = XFS_EXTLEN_MIN(*slena, args->maxlen); |
| xfs_alloc_fix_len(args); |
| |
| sdiff = xfs_alloc_compute_diff(args->agbno, args->len, |
| args->alignment, |
| args->datatype, *sbnoa, |
| *slena, &new); |
| |
| /* |
| * Choose closer size and invalidate other cursor. |
| */ |
| if (sdiff < gdiff) |
| goto out_use_search; |
| goto out_use_good; |
| } |
| |
| if (!dir) |
| error = xfs_btree_increment(*scur, 0, &i); |
| else |
| error = xfs_btree_decrement(*scur, 0, &i); |
| if (error) |
| goto error0; |
| } while (i); |
| |
| out_use_good: |
| xfs_btree_del_cursor(*scur, XFS_BTREE_NOERROR); |
| *scur = NULL; |
| return 0; |
| |
| out_use_search: |
| xfs_btree_del_cursor(*gcur, XFS_BTREE_NOERROR); |
| *gcur = NULL; |
| return 0; |
| |
| error0: |
| /* caller invalidates cursors */ |
| return error; |
| } |
| |
| /* |
| * Allocate a variable extent near bno in the allocation group agno. |
| * Extent's length (returned in len) will be between minlen and maxlen, |
| * and of the form k * prod + mod unless there's nothing that large. |
| * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. |
| */ |
| STATIC int /* error */ |
| xfs_alloc_ag_vextent_near( |
| xfs_alloc_arg_t *args) /* allocation argument structure */ |
| { |
| xfs_btree_cur_t *bno_cur_gt; /* cursor for bno btree, right side */ |
| xfs_btree_cur_t *bno_cur_lt; /* cursor for bno btree, left side */ |
| xfs_btree_cur_t *cnt_cur; /* cursor for count btree */ |
| xfs_agblock_t gtbno; /* start bno of right side entry */ |
| xfs_agblock_t gtbnoa; /* aligned ... */ |
| xfs_extlen_t gtdiff; /* difference to right side entry */ |
| xfs_extlen_t gtlen; /* length of right side entry */ |
| xfs_extlen_t gtlena; /* aligned ... */ |
| xfs_agblock_t gtnew; /* useful start bno of right side */ |
| int error; /* error code */ |
| int i; /* result code, temporary */ |
| int j; /* result code, temporary */ |
| xfs_agblock_t ltbno; /* start bno of left side entry */ |
| xfs_agblock_t ltbnoa; /* aligned ... */ |
| xfs_extlen_t ltdiff; /* difference to left side entry */ |
| xfs_extlen_t ltlen; /* length of left side entry */ |
| xfs_extlen_t ltlena; /* aligned ... */ |
| xfs_agblock_t ltnew; /* useful start bno of left side */ |
| xfs_extlen_t rlen; /* length of returned extent */ |
| bool busy; |
| unsigned busy_gen; |
| #ifdef DEBUG |
| /* |
| * Randomly don't execute the first algorithm. |
| */ |
| int dofirst; /* set to do first algorithm */ |
| |
| dofirst = prandom_u32() & 1; |
| #endif |
| |
| /* handle unitialized agbno range so caller doesn't have to */ |
| if (!args->min_agbno && !args->max_agbno) |
| args->max_agbno = args->mp->m_sb.sb_agblocks - 1; |
| ASSERT(args->min_agbno <= args->max_agbno); |
| |
| /* clamp agbno to the range if it's outside */ |
| if (args->agbno < args->min_agbno) |
| args->agbno = args->min_agbno; |
| if (args->agbno > args->max_agbno) |
| args->agbno = args->max_agbno; |
| |
| restart: |
| bno_cur_lt = NULL; |
| bno_cur_gt = NULL; |
| ltlen = 0; |
| gtlena = 0; |
| ltlena = 0; |
| busy = false; |
| |
| /* |
| * Get a cursor for the by-size btree. |
| */ |
| cnt_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
| args->agno, XFS_BTNUM_CNT); |
| |
| /* |
| * See if there are any free extents as big as maxlen. |
| */ |
| if ((error = xfs_alloc_lookup_ge(cnt_cur, 0, args->maxlen, &i))) |
| goto error0; |
| /* |
| * If none, then pick up the last entry in the tree unless the |
| * tree is empty. |
| */ |
| if (!i) { |
| if ((error = xfs_alloc_ag_vextent_small(args, cnt_cur, <bno, |
| <len, &i))) |
| goto error0; |
| if (i == 0 || ltlen == 0) { |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
| trace_xfs_alloc_near_noentry(args); |
| return 0; |
| } |
| ASSERT(i == 1); |
| } |
| args->wasfromfl = 0; |
| |
| /* |
| * First algorithm. |
| * If the requested extent is large wrt the freespaces available |
| * in this a.g., then the cursor will be pointing to a btree entry |
| * near the right edge of the tree. If it's in the last btree leaf |
| * block, then we just examine all the entries in that block |
| * that are big enough, and pick the best one. |
| * This is written as a while loop so we can break out of it, |
| * but we never loop back to the top. |
| */ |
| while (xfs_btree_islastblock(cnt_cur, 0)) { |
| xfs_extlen_t bdiff; |
| int besti=0; |
| xfs_extlen_t blen=0; |
| xfs_agblock_t bnew=0; |
| |
| #ifdef DEBUG |
| if (dofirst) |
| break; |
| #endif |
| /* |
| * Start from the entry that lookup found, sequence through |
| * all larger free blocks. If we're actually pointing at a |
| * record smaller than maxlen, go to the start of this block, |
| * and skip all those smaller than minlen. |
| */ |
| if (ltlen || args->alignment > 1) { |
| cnt_cur->bc_ptrs[0] = 1; |
| do { |
| if ((error = xfs_alloc_get_rec(cnt_cur, <bno, |
| <len, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
| if (ltlen >= args->minlen) |
| break; |
| if ((error = xfs_btree_increment(cnt_cur, 0, &i))) |
| goto error0; |
| } while (i); |
| ASSERT(ltlen >= args->minlen); |
| if (!i) |
| break; |
| } |
| i = cnt_cur->bc_ptrs[0]; |
| for (j = 1, blen = 0, bdiff = 0; |
| !error && j && (blen < args->maxlen || bdiff > 0); |
| error = xfs_btree_increment(cnt_cur, 0, &j)) { |
| /* |
| * For each entry, decide if it's better than |
| * the previous best entry. |
| */ |
| if ((error = xfs_alloc_get_rec(cnt_cur, <bno, <len, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
| busy = xfs_alloc_compute_aligned(args, ltbno, ltlen, |
| <bnoa, <lena, &busy_gen); |
| if (ltlena < args->minlen) |
| continue; |
| if (ltbnoa < args->min_agbno || ltbnoa > args->max_agbno) |
| continue; |
| args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); |
| xfs_alloc_fix_len(args); |
| ASSERT(args->len >= args->minlen); |
| if (args->len < blen) |
| continue; |
| ltdiff = xfs_alloc_compute_diff(args->agbno, args->len, |
| args->alignment, args->datatype, ltbnoa, |
| ltlena, <new); |
| if (ltnew != NULLAGBLOCK && |
| (args->len > blen || ltdiff < bdiff)) { |
| bdiff = ltdiff; |
| bnew = ltnew; |
| blen = args->len; |
| besti = cnt_cur->bc_ptrs[0]; |
| } |
| } |
| /* |
| * It didn't work. We COULD be in a case where |
| * there's a good record somewhere, so try again. |
| */ |
| if (blen == 0) |
| break; |
| /* |
| * Point at the best entry, and retrieve it again. |
| */ |
| cnt_cur->bc_ptrs[0] = besti; |
| if ((error = xfs_alloc_get_rec(cnt_cur, <bno, <len, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
| ASSERT(ltbno + ltlen <= be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length)); |
| args->len = blen; |
| |
| /* |
| * We are allocating starting at bnew for blen blocks. |
| */ |
| args->agbno = bnew; |
| ASSERT(bnew >= ltbno); |
| ASSERT(bnew + blen <= ltbno + ltlen); |
| /* |
| * Set up a cursor for the by-bno tree. |
| */ |
| bno_cur_lt = xfs_allocbt_init_cursor(args->mp, args->tp, |
| args->agbp, args->agno, XFS_BTNUM_BNO); |
| /* |
| * Fix up the btree entries. |
| */ |
| if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur_lt, ltbno, |
| ltlen, bnew, blen, XFSA_FIXUP_CNT_OK))) |
| goto error0; |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
| xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_NOERROR); |
| |
| trace_xfs_alloc_near_first(args); |
| return 0; |
| } |
| /* |
| * Second algorithm. |
| * Search in the by-bno tree to the left and to the right |
| * simultaneously, until in each case we find a space big enough, |
| * or run into the edge of the tree. When we run into the edge, |
| * we deallocate that cursor. |
| * If both searches succeed, we compare the two spaces and pick |
| * the better one. |
| * With alignment, it's possible for both to fail; the upper |
| * level algorithm that picks allocation groups for allocations |
| * is not supposed to do this. |
| */ |
| /* |
| * Allocate and initialize the cursor for the leftward search. |
| */ |
| bno_cur_lt = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
| args->agno, XFS_BTNUM_BNO); |
| /* |
| * Lookup <= bno to find the leftward search's starting point. |
| */ |
| if ((error = xfs_alloc_lookup_le(bno_cur_lt, args->agbno, args->maxlen, &i))) |
| goto error0; |
| if (!i) { |
| /* |
| * Didn't find anything; use this cursor for the rightward |
| * search. |
| */ |
| bno_cur_gt = bno_cur_lt; |
| bno_cur_lt = NULL; |
| } |
| /* |
| * Found something. Duplicate the cursor for the rightward search. |
| */ |
| else if ((error = xfs_btree_dup_cursor(bno_cur_lt, &bno_cur_gt))) |
| goto error0; |
| /* |
| * Increment the cursor, so we will point at the entry just right |
| * of the leftward entry if any, or to the leftmost entry. |
| */ |
| if ((error = xfs_btree_increment(bno_cur_gt, 0, &i))) |
| goto error0; |
| if (!i) { |
| /* |
| * It failed, there are no rightward entries. |
| */ |
| xfs_btree_del_cursor(bno_cur_gt, XFS_BTREE_NOERROR); |
| bno_cur_gt = NULL; |
| } |
| /* |
| * Loop going left with the leftward cursor, right with the |
| * rightward cursor, until either both directions give up or |
| * we find an entry at least as big as minlen. |
| */ |
| do { |
| if (bno_cur_lt) { |
| if ((error = xfs_alloc_get_rec(bno_cur_lt, <bno, <len, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
| busy |= xfs_alloc_compute_aligned(args, ltbno, ltlen, |
| <bnoa, <lena, &busy_gen); |
| if (ltlena >= args->minlen && ltbnoa >= args->min_agbno) |
| break; |
| if ((error = xfs_btree_decrement(bno_cur_lt, 0, &i))) |
| goto error0; |
| if (!i || ltbnoa < args->min_agbno) { |
| xfs_btree_del_cursor(bno_cur_lt, |
| XFS_BTREE_NOERROR); |
| bno_cur_lt = NULL; |
| } |
| } |
| if (bno_cur_gt) { |
| if ((error = xfs_alloc_get_rec(bno_cur_gt, >bno, >len, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
| busy |= xfs_alloc_compute_aligned(args, gtbno, gtlen, |
| >bnoa, >lena, &busy_gen); |
| if (gtlena >= args->minlen && gtbnoa <= args->max_agbno) |
| break; |
| if ((error = xfs_btree_increment(bno_cur_gt, 0, &i))) |
| goto error0; |
| if (!i || gtbnoa > args->max_agbno) { |
| xfs_btree_del_cursor(bno_cur_gt, |
| XFS_BTREE_NOERROR); |
| bno_cur_gt = NULL; |
| } |
| } |
| } while (bno_cur_lt || bno_cur_gt); |
| |
| /* |
| * Got both cursors still active, need to find better entry. |
| */ |
| if (bno_cur_lt && bno_cur_gt) { |
| if (ltlena >= args->minlen) { |
| /* |
| * Left side is good, look for a right side entry. |
| */ |
| args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); |
| xfs_alloc_fix_len(args); |
| ltdiff = xfs_alloc_compute_diff(args->agbno, args->len, |
| args->alignment, args->datatype, ltbnoa, |
| ltlena, <new); |
| |
| error = xfs_alloc_find_best_extent(args, |
| &bno_cur_lt, &bno_cur_gt, |
| ltdiff, >bno, >len, |
| >bnoa, >lena, |
| 0 /* search right */); |
| } else { |
| ASSERT(gtlena >= args->minlen); |
| |
| /* |
| * Right side is good, look for a left side entry. |
| */ |
| args->len = XFS_EXTLEN_MIN(gtlena, args->maxlen); |
| xfs_alloc_fix_len(args); |
| gtdiff = xfs_alloc_compute_diff(args->agbno, args->len, |
| args->alignment, args->datatype, gtbnoa, |
| gtlena, >new); |
| |
| error = xfs_alloc_find_best_extent(args, |
| &bno_cur_gt, &bno_cur_lt, |
| gtdiff, <bno, <len, |
| <bnoa, <lena, |
| 1 /* search left */); |
| } |
| |
| if (error) |
| goto error0; |
| } |
| |
| /* |
| * If we couldn't get anything, give up. |
| */ |
| if (bno_cur_lt == NULL && bno_cur_gt == NULL) { |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
| |
| if (busy) { |
| trace_xfs_alloc_near_busy(args); |
| xfs_extent_busy_flush(args->mp, args->pag, busy_gen); |
| goto restart; |
| } |
| trace_xfs_alloc_size_neither(args); |
| args->agbno = NULLAGBLOCK; |
| return 0; |
| } |
| |
| /* |
| * At this point we have selected a freespace entry, either to the |
| * left or to the right. If it's on the right, copy all the |
| * useful variables to the "left" set so we only have one |
| * copy of this code. |
| */ |
| if (bno_cur_gt) { |
| bno_cur_lt = bno_cur_gt; |
| bno_cur_gt = NULL; |
| ltbno = gtbno; |
| ltbnoa = gtbnoa; |
| ltlen = gtlen; |
| ltlena = gtlena; |
| j = 1; |
| } else |
| j = 0; |
| |
| /* |
| * Fix up the length and compute the useful address. |
| */ |
| args->len = XFS_EXTLEN_MIN(ltlena, args->maxlen); |
| xfs_alloc_fix_len(args); |
| rlen = args->len; |
| (void)xfs_alloc_compute_diff(args->agbno, rlen, args->alignment, |
| args->datatype, ltbnoa, ltlena, <new); |
| ASSERT(ltnew >= ltbno); |
| ASSERT(ltnew + rlen <= ltbnoa + ltlena); |
| ASSERT(ltnew + rlen <= be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length)); |
| ASSERT(ltnew >= args->min_agbno && ltnew <= args->max_agbno); |
| args->agbno = ltnew; |
| |
| if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur_lt, ltbno, ltlen, |
| ltnew, rlen, XFSA_FIXUP_BNO_OK))) |
| goto error0; |
| |
| if (j) |
| trace_xfs_alloc_near_greater(args); |
| else |
| trace_xfs_alloc_near_lesser(args); |
| |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
| xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_NOERROR); |
| return 0; |
| |
| error0: |
| trace_xfs_alloc_near_error(args); |
| if (cnt_cur != NULL) |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); |
| if (bno_cur_lt != NULL) |
| xfs_btree_del_cursor(bno_cur_lt, XFS_BTREE_ERROR); |
| if (bno_cur_gt != NULL) |
| xfs_btree_del_cursor(bno_cur_gt, XFS_BTREE_ERROR); |
| return error; |
| } |
| |
| /* |
| * Allocate a variable extent anywhere in the allocation group agno. |
| * Extent's length (returned in len) will be between minlen and maxlen, |
| * and of the form k * prod + mod unless there's nothing that large. |
| * Return the starting a.g. block, or NULLAGBLOCK if we can't do it. |
| */ |
| STATIC int /* error */ |
| xfs_alloc_ag_vextent_size( |
| xfs_alloc_arg_t *args) /* allocation argument structure */ |
| { |
| xfs_btree_cur_t *bno_cur; /* cursor for bno btree */ |
| xfs_btree_cur_t *cnt_cur; /* cursor for cnt btree */ |
| int error; /* error result */ |
| xfs_agblock_t fbno; /* start of found freespace */ |
| xfs_extlen_t flen; /* length of found freespace */ |
| int i; /* temp status variable */ |
| xfs_agblock_t rbno; /* returned block number */ |
| xfs_extlen_t rlen; /* length of returned extent */ |
| bool busy; |
| unsigned busy_gen; |
| |
| restart: |
| /* |
| * Allocate and initialize a cursor for the by-size btree. |
| */ |
| cnt_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
| args->agno, XFS_BTNUM_CNT); |
| bno_cur = NULL; |
| busy = false; |
| |
| /* |
| * Look for an entry >= maxlen+alignment-1 blocks. |
| */ |
| if ((error = xfs_alloc_lookup_ge(cnt_cur, 0, |
| args->maxlen + args->alignment - 1, &i))) |
| goto error0; |
| |
| /* |
| * If none then we have to settle for a smaller extent. In the case that |
| * there are no large extents, this will return the last entry in the |
| * tree unless the tree is empty. In the case that there are only busy |
| * large extents, this will return the largest small extent unless there |
| * are no smaller extents available. |
| */ |
| if (!i) { |
| error = xfs_alloc_ag_vextent_small(args, cnt_cur, |
| &fbno, &flen, &i); |
| if (error) |
| goto error0; |
| if (i == 0 || flen == 0) { |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
| trace_xfs_alloc_size_noentry(args); |
| return 0; |
| } |
| ASSERT(i == 1); |
| busy = xfs_alloc_compute_aligned(args, fbno, flen, &rbno, |
| &rlen, &busy_gen); |
| } else { |
| /* |
| * Search for a non-busy extent that is large enough. |
| */ |
| for (;;) { |
| error = xfs_alloc_get_rec(cnt_cur, &fbno, &flen, &i); |
| if (error) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
| |
| busy = xfs_alloc_compute_aligned(args, fbno, flen, |
| &rbno, &rlen, &busy_gen); |
| |
| if (rlen >= args->maxlen) |
| break; |
| |
| error = xfs_btree_increment(cnt_cur, 0, &i); |
| if (error) |
| goto error0; |
| if (i == 0) { |
| /* |
| * Our only valid extents must have been busy. |
| * Make it unbusy by forcing the log out and |
| * retrying. |
| */ |
| xfs_btree_del_cursor(cnt_cur, |
| XFS_BTREE_NOERROR); |
| trace_xfs_alloc_size_busy(args); |
| xfs_extent_busy_flush(args->mp, |
| args->pag, busy_gen); |
| goto restart; |
| } |
| } |
| } |
| |
| /* |
| * In the first case above, we got the last entry in the |
| * by-size btree. Now we check to see if the space hits maxlen |
| * once aligned; if not, we search left for something better. |
| * This can't happen in the second case above. |
| */ |
| rlen = XFS_EXTLEN_MIN(args->maxlen, rlen); |
| XFS_WANT_CORRUPTED_GOTO(args->mp, rlen == 0 || |
| (rlen <= flen && rbno + rlen <= fbno + flen), error0); |
| if (rlen < args->maxlen) { |
| xfs_agblock_t bestfbno; |
| xfs_extlen_t bestflen; |
| xfs_agblock_t bestrbno; |
| xfs_extlen_t bestrlen; |
| |
| bestrlen = rlen; |
| bestrbno = rbno; |
| bestflen = flen; |
| bestfbno = fbno; |
| for (;;) { |
| if ((error = xfs_btree_decrement(cnt_cur, 0, &i))) |
| goto error0; |
| if (i == 0) |
| break; |
| if ((error = xfs_alloc_get_rec(cnt_cur, &fbno, &flen, |
| &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
| if (flen < bestrlen) |
| break; |
| busy = xfs_alloc_compute_aligned(args, fbno, flen, |
| &rbno, &rlen, &busy_gen); |
| rlen = XFS_EXTLEN_MIN(args->maxlen, rlen); |
| XFS_WANT_CORRUPTED_GOTO(args->mp, rlen == 0 || |
| (rlen <= flen && rbno + rlen <= fbno + flen), |
| error0); |
| if (rlen > bestrlen) { |
| bestrlen = rlen; |
| bestrbno = rbno; |
| bestflen = flen; |
| bestfbno = fbno; |
| if (rlen == args->maxlen) |
| break; |
| } |
| } |
| if ((error = xfs_alloc_lookup_eq(cnt_cur, bestfbno, bestflen, |
| &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
| rlen = bestrlen; |
| rbno = bestrbno; |
| flen = bestflen; |
| fbno = bestfbno; |
| } |
| args->wasfromfl = 0; |
| /* |
| * Fix up the length. |
| */ |
| args->len = rlen; |
| if (rlen < args->minlen) { |
| if (busy) { |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
| trace_xfs_alloc_size_busy(args); |
| xfs_extent_busy_flush(args->mp, args->pag, busy_gen); |
| goto restart; |
| } |
| goto out_nominleft; |
| } |
| xfs_alloc_fix_len(args); |
| |
| rlen = args->len; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, rlen <= flen, error0); |
| /* |
| * Allocate and initialize a cursor for the by-block tree. |
| */ |
| bno_cur = xfs_allocbt_init_cursor(args->mp, args->tp, args->agbp, |
| args->agno, XFS_BTNUM_BNO); |
| if ((error = xfs_alloc_fixup_trees(cnt_cur, bno_cur, fbno, flen, |
| rbno, rlen, XFSA_FIXUP_CNT_OK))) |
| goto error0; |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
| xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); |
| cnt_cur = bno_cur = NULL; |
| args->len = rlen; |
| args->agbno = rbno; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, |
| args->agbno + args->len <= |
| be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length), |
| error0); |
| trace_xfs_alloc_size_done(args); |
| return 0; |
| |
| error0: |
| trace_xfs_alloc_size_error(args); |
| if (cnt_cur) |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); |
| if (bno_cur) |
| xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); |
| return error; |
| |
| out_nominleft: |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
| trace_xfs_alloc_size_nominleft(args); |
| args->agbno = NULLAGBLOCK; |
| return 0; |
| } |
| |
| /* |
| * Deal with the case where only small freespaces remain. |
| * Either return the contents of the last freespace record, |
| * or allocate space from the freelist if there is nothing in the tree. |
| */ |
| STATIC int /* error */ |
| xfs_alloc_ag_vextent_small( |
| xfs_alloc_arg_t *args, /* allocation argument structure */ |
| xfs_btree_cur_t *ccur, /* by-size cursor */ |
| xfs_agblock_t *fbnop, /* result block number */ |
| xfs_extlen_t *flenp, /* result length */ |
| int *stat) /* status: 0-freelist, 1-normal/none */ |
| { |
| int error; |
| xfs_agblock_t fbno; |
| xfs_extlen_t flen; |
| int i; |
| |
| if ((error = xfs_btree_decrement(ccur, 0, &i))) |
| goto error0; |
| if (i) { |
| if ((error = xfs_alloc_get_rec(ccur, &fbno, &flen, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, error0); |
| } |
| /* |
| * Nothing in the btree, try the freelist. Make sure |
| * to respect minleft even when pulling from the |
| * freelist. |
| */ |
| else if (args->minlen == 1 && args->alignment == 1 && |
| args->resv != XFS_AG_RESV_AGFL && |
| (be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_flcount) |
| > args->minleft)) { |
| error = xfs_alloc_get_freelist(args->tp, args->agbp, &fbno, 0); |
| if (error) |
| goto error0; |
| if (fbno != NULLAGBLOCK) { |
| xfs_extent_busy_reuse(args->mp, args->agno, fbno, 1, |
| xfs_alloc_allow_busy_reuse(args->datatype)); |
| |
| if (xfs_alloc_is_userdata(args->datatype)) { |
| xfs_buf_t *bp; |
| |
| bp = xfs_btree_get_bufs(args->mp, args->tp, |
| args->agno, fbno, 0); |
| if (!bp) { |
| error = -EFSCORRUPTED; |
| goto error0; |
| } |
| xfs_trans_binval(args->tp, bp); |
| } |
| args->len = 1; |
| args->agbno = fbno; |
| XFS_WANT_CORRUPTED_GOTO(args->mp, |
| args->agbno + args->len <= |
| be32_to_cpu(XFS_BUF_TO_AGF(args->agbp)->agf_length), |
| error0); |
| args->wasfromfl = 1; |
| trace_xfs_alloc_small_freelist(args); |
| |
| /* |
| * If we're feeding an AGFL block to something that |
| * doesn't live in the free space, we need to clear |
| * out the OWN_AG rmap. |
| */ |
| error = xfs_rmap_free(args->tp, args->agbp, args->agno, |
| fbno, 1, &XFS_RMAP_OINFO_AG); |
| if (error) |
| goto error0; |
| |
| *stat = 0; |
| return 0; |
| } |
| /* |
| * Nothing in the freelist. |
| */ |
| else |
| flen = 0; |
| } |
| /* |
| * Can't allocate from the freelist for some reason. |
| */ |
| else { |
| fbno = NULLAGBLOCK; |
| flen = 0; |
| } |
| /* |
| * Can't do the allocation, give up. |
| */ |
| if (flen < args->minlen) { |
| args->agbno = NULLAGBLOCK; |
| trace_xfs_alloc_small_notenough(args); |
| flen = 0; |
| } |
| *fbnop = fbno; |
| *flenp = flen; |
| *stat = 1; |
| trace_xfs_alloc_small_done(args); |
| return 0; |
| |
| error0: |
| trace_xfs_alloc_small_error(args); |
| return error; |
| } |
| |
| /* |
| * Free the extent starting at agno/bno for length. |
| */ |
| STATIC int |
| xfs_free_ag_extent( |
| struct xfs_trans *tp, |
| struct xfs_buf *agbp, |
| xfs_agnumber_t agno, |
| xfs_agblock_t bno, |
| xfs_extlen_t len, |
| const struct xfs_owner_info *oinfo, |
| enum xfs_ag_resv_type type) |
| { |
| struct xfs_mount *mp; |
| struct xfs_perag *pag; |
| struct xfs_btree_cur *bno_cur; |
| struct xfs_btree_cur *cnt_cur; |
| xfs_agblock_t gtbno; /* start of right neighbor */ |
| xfs_extlen_t gtlen; /* length of right neighbor */ |
| xfs_agblock_t ltbno; /* start of left neighbor */ |
| xfs_extlen_t ltlen; /* length of left neighbor */ |
| xfs_agblock_t nbno; /* new starting block of freesp */ |
| xfs_extlen_t nlen; /* new length of freespace */ |
| int haveleft; /* have a left neighbor */ |
| int haveright; /* have a right neighbor */ |
| int i; |
| int error; |
| |
| bno_cur = cnt_cur = NULL; |
| mp = tp->t_mountp; |
| |
| if (!xfs_rmap_should_skip_owner_update(oinfo)) { |
| error = xfs_rmap_free(tp, agbp, agno, bno, len, oinfo); |
| if (error) |
| goto error0; |
| } |
| |
| /* |
| * Allocate and initialize a cursor for the by-block btree. |
| */ |
| bno_cur = xfs_allocbt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_BNO); |
| /* |
| * Look for a neighboring block on the left (lower block numbers) |
| * that is contiguous with this space. |
| */ |
| if ((error = xfs_alloc_lookup_le(bno_cur, bno, len, &haveleft))) |
| goto error0; |
| if (haveleft) { |
| /* |
| * There is a block to our left. |
| */ |
| if ((error = xfs_alloc_get_rec(bno_cur, <bno, <len, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| /* |
| * It's not contiguous, though. |
| */ |
| if (ltbno + ltlen < bno) |
| haveleft = 0; |
| else { |
| /* |
| * If this failure happens the request to free this |
| * space was invalid, it's (partly) already free. |
| * Very bad. |
| */ |
| XFS_WANT_CORRUPTED_GOTO(mp, |
| ltbno + ltlen <= bno, error0); |
| } |
| } |
| /* |
| * Look for a neighboring block on the right (higher block numbers) |
| * that is contiguous with this space. |
| */ |
| if ((error = xfs_btree_increment(bno_cur, 0, &haveright))) |
| goto error0; |
| if (haveright) { |
| /* |
| * There is a block to our right. |
| */ |
| if ((error = xfs_alloc_get_rec(bno_cur, >bno, >len, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| /* |
| * It's not contiguous, though. |
| */ |
| if (bno + len < gtbno) |
| haveright = 0; |
| else { |
| /* |
| * If this failure happens the request to free this |
| * space was invalid, it's (partly) already free. |
| * Very bad. |
| */ |
| XFS_WANT_CORRUPTED_GOTO(mp, gtbno >= bno + len, error0); |
| } |
| } |
| /* |
| * Now allocate and initialize a cursor for the by-size tree. |
| */ |
| cnt_cur = xfs_allocbt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_CNT); |
| /* |
| * Have both left and right contiguous neighbors. |
| * Merge all three into a single free block. |
| */ |
| if (haveleft && haveright) { |
| /* |
| * Delete the old by-size entry on the left. |
| */ |
| if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| if ((error = xfs_btree_delete(cnt_cur, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| /* |
| * Delete the old by-size entry on the right. |
| */ |
| if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| if ((error = xfs_btree_delete(cnt_cur, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| /* |
| * Delete the old by-block entry for the right block. |
| */ |
| if ((error = xfs_btree_delete(bno_cur, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| /* |
| * Move the by-block cursor back to the left neighbor. |
| */ |
| if ((error = xfs_btree_decrement(bno_cur, 0, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| #ifdef DEBUG |
| /* |
| * Check that this is the right record: delete didn't |
| * mangle the cursor. |
| */ |
| { |
| xfs_agblock_t xxbno; |
| xfs_extlen_t xxlen; |
| |
| if ((error = xfs_alloc_get_rec(bno_cur, &xxbno, &xxlen, |
| &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, |
| i == 1 && xxbno == ltbno && xxlen == ltlen, |
| error0); |
| } |
| #endif |
| /* |
| * Update remaining by-block entry to the new, joined block. |
| */ |
| nbno = ltbno; |
| nlen = len + ltlen + gtlen; |
| if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) |
| goto error0; |
| } |
| /* |
| * Have only a left contiguous neighbor. |
| * Merge it together with the new freespace. |
| */ |
| else if (haveleft) { |
| /* |
| * Delete the old by-size entry on the left. |
| */ |
| if ((error = xfs_alloc_lookup_eq(cnt_cur, ltbno, ltlen, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| if ((error = xfs_btree_delete(cnt_cur, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| /* |
| * Back up the by-block cursor to the left neighbor, and |
| * update its length. |
| */ |
| if ((error = xfs_btree_decrement(bno_cur, 0, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| nbno = ltbno; |
| nlen = len + ltlen; |
| if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) |
| goto error0; |
| } |
| /* |
| * Have only a right contiguous neighbor. |
| * Merge it together with the new freespace. |
| */ |
| else if (haveright) { |
| /* |
| * Delete the old by-size entry on the right. |
| */ |
| if ((error = xfs_alloc_lookup_eq(cnt_cur, gtbno, gtlen, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| if ((error = xfs_btree_delete(cnt_cur, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| /* |
| * Update the starting block and length of the right |
| * neighbor in the by-block tree. |
| */ |
| nbno = bno; |
| nlen = len + gtlen; |
| if ((error = xfs_alloc_update(bno_cur, nbno, nlen))) |
| goto error0; |
| } |
| /* |
| * No contiguous neighbors. |
| * Insert the new freespace into the by-block tree. |
| */ |
| else { |
| nbno = bno; |
| nlen = len; |
| if ((error = xfs_btree_insert(bno_cur, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| } |
| xfs_btree_del_cursor(bno_cur, XFS_BTREE_NOERROR); |
| bno_cur = NULL; |
| /* |
| * In all cases we need to insert the new freespace in the by-size tree. |
| */ |
| if ((error = xfs_alloc_lookup_eq(cnt_cur, nbno, nlen, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 0, error0); |
| if ((error = xfs_btree_insert(cnt_cur, &i))) |
| goto error0; |
| XFS_WANT_CORRUPTED_GOTO(mp, i == 1, error0); |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR); |
| cnt_cur = NULL; |
| |
| /* |
| * Update the freespace totals in the ag and superblock. |
| */ |
| pag = xfs_perag_get(mp, agno); |
| error = xfs_alloc_update_counters(tp, pag, agbp, len); |
| xfs_ag_resv_free_extent(pag, type, tp, len); |
| xfs_perag_put(pag); |
| if (error) |
| goto error0; |
| |
| XFS_STATS_INC(mp, xs_freex); |
| XFS_STATS_ADD(mp, xs_freeb, len); |
| |
| trace_xfs_free_extent(mp, agno, bno, len, type, haveleft, haveright); |
| |
| return 0; |
| |
| error0: |
| trace_xfs_free_extent(mp, agno, bno, len, type, -1, -1); |
| if (bno_cur) |
| xfs_btree_del_cursor(bno_cur, XFS_BTREE_ERROR); |
| if (cnt_cur) |
| xfs_btree_del_cursor(cnt_cur, XFS_BTREE_ERROR); |
| return error; |
| } |
| |
| /* |
| * Visible (exported) allocation/free functions. |
| * Some of these are used just by xfs_alloc_btree.c and this file. |
| */ |
| |
| /* |
| * Compute and fill in value of m_ag_maxlevels. |
| */ |
| void |
| xfs_alloc_compute_maxlevels( |
| xfs_mount_t *mp) /* file system mount structure */ |
| { |
| mp->m_ag_maxlevels = xfs_btree_compute_maxlevels(mp->m_alloc_mnr, |
| (mp->m_sb.sb_agblocks + 1) / 2); |
| } |
| |
| /* |
| * Find the length of the longest extent in an AG. The 'need' parameter |
| * specifies how much space we're going to need for the AGFL and the |
| * 'reserved' parameter tells us how many blocks in this AG are reserved for |
| * other callers. |
| */ |
| xfs_extlen_t |
| xfs_alloc_longest_free_extent( |
| struct xfs_perag *pag, |
| xfs_extlen_t need, |
| xfs_extlen_t reserved) |
| { |
| xfs_extlen_t delta = 0; |
| |
| /* |
| * If the AGFL needs a recharge, we'll have to subtract that from the |
| * longest extent. |
| */ |
| if (need > pag->pagf_flcount) |
| delta = need - pag->pagf_flcount; |
| |
| /* |
| * If we cannot maintain others' reservations with space from the |
| * not-longest freesp extents, we'll have to subtract /that/ from |
| * the longest extent too. |
| */ |
| if (pag->pagf_freeblks - pag->pagf_longest < reserved) |
| delta += reserved - (pag->pagf_freeblks - pag->pagf_longest); |
| |
| /* |
| * If the longest extent is long enough to satisfy all the |
| * reservations and AGFL rules in place, we can return this extent. |
| */ |
| if (pag->pagf_longest > delta) |
| return pag->pagf_longest - delta; |
| |
| /* Otherwise, let the caller try for 1 block if there's space. */ |
| return pag->pagf_flcount > 0 || pag->pagf_longest > 0; |
| } |
| |
| unsigned int |
| xfs_alloc_min_freelist( |
| struct xfs_mount *mp, |
| struct xfs_perag *pag) |
| { |
| unsigned int min_free; |
| |
| /* space needed by-bno freespace btree */ |
| min_free = min_t(unsigned int, pag->pagf_levels[XFS_BTNUM_BNOi] + 1, |
| mp->m_ag_maxlevels); |
| /* space needed by-size freespace btree */ |
| min_free += min_t(unsigned int, pag->pagf_levels[XFS_BTNUM_CNTi] + 1, |
| mp->m_ag_maxlevels); |
| /* space needed reverse mapping used space btree */ |
| if (xfs_sb_version_hasrmapbt(&mp->m_sb)) |
| min_free += min_t(unsigned int, |
| pag->pagf_levels[XFS_BTNUM_RMAPi] + 1, |
| mp->m_rmap_maxlevels); |
| |
| return min_free; |
| } |
| |
| /* |
| * Check if the operation we are fixing up the freelist for should go ahead or |
| * not. If we are freeing blocks, we always allow it, otherwise the allocation |
| * is dependent on whether the size and shape of free space available will |
| * permit the requested allocation to take place. |
| */ |
| static bool |
| xfs_alloc_space_available( |
| struct xfs_alloc_arg *args, |
| xfs_extlen_t min_free, |
| int flags) |
| { |
| struct xfs_perag *pag = args->pag; |
| xfs_extlen_t alloc_len, longest; |
| xfs_extlen_t reservation; /* blocks that are still reserved */ |
| int available; |
| xfs_extlen_t agflcount; |
| |
| if (flags & XFS_ALLOC_FLAG_FREEING) |
| return true; |
| |
| reservation = xfs_ag_resv_needed(pag, args->resv); |
| |
| /* do we have enough contiguous free space for the allocation? */ |
| alloc_len = args->minlen + (args->alignment - 1) + args->minalignslop; |
| longest = xfs_alloc_longest_free_extent(pag, min_free, reservation); |
| if (longest < alloc_len) |
| return false; |
| |
| /* |
| * Do we have enough free space remaining for the allocation? Don't |
| * account extra agfl blocks because we are about to defer free them, |
| * making them unavailable until the current transaction commits. |
| */ |
| agflcount = min_t(xfs_extlen_t, pag->pagf_flcount, min_free); |
| available = (int)(pag->pagf_freeblks + agflcount - |
| reservation - min_free - args->minleft); |
| if (available < (int)max(args->total, alloc_len)) |
| return false; |
| |
| /* |
| * Clamp maxlen to the amount of free space available for the actual |
| * extent allocation. |
| */ |
| if (available < (int)args->maxlen && !(flags & XFS_ALLOC_FLAG_CHECK)) { |
| args->maxlen = available; |
| ASSERT(args->maxlen > 0); |
| ASSERT(args->maxlen >= args->minlen); |
| } |
| |
| return true; |
| } |
| |
| int |
| xfs_free_agfl_block( |
| struct xfs_trans *tp, |
| xfs_agnumber_t agno, |
| xfs_agblock_t agbno, |
| struct xfs_buf *agbp, |
| struct xfs_owner_info *oinfo) |
| { |
| int error; |
| struct xfs_buf *bp; |
| |
| error = xfs_free_ag_extent(tp, agbp, agno, agbno, 1, oinfo, |
| XFS_AG_RESV_AGFL); |
| if (error) |
| return error; |
| |
| bp = xfs_btree_get_bufs(tp->t_mountp, tp, agno, agbno, 0); |
| if (!bp) |
| return -EFSCORRUPTED; |
| xfs_trans_binval(tp, bp); |
| |
| return 0; |
| } |
| |
| /* |
| * Check the agfl fields of the agf for inconsistency or corruption. The purpose |
| * is to detect an agfl header padding mismatch between current and early v5 |
| * kernels. This problem manifests as a 1-slot size difference between the |
| * on-disk flcount and the active [first, last] range of a wrapped agfl. This |
| * may also catch variants of agfl count corruption unrelated to padding. Either |
| * way, we'll reset the agfl and warn the user. |
| * |
| * Return true if a reset is required before the agfl can be used, false |
| * otherwise. |
| */ |
| static bool |
| xfs_agfl_needs_reset( |
| struct xfs_mount *mp, |
| struct xfs_agf *agf) |
| { |
| uint32_t f = be32_to_cpu(agf->agf_flfirst); |
| uint32_t l = be32_to_cpu(agf->agf_fllast); |
| uint32_t c = be32_to_cpu(agf->agf_flcount); |
| int agfl_size = xfs_agfl_size(mp); |
| int active; |
| |
| /* no agfl header on v4 supers */ |
| if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| return false; |
| |
| /* |
| * The agf read verifier catches severe corruption of these fields. |
| * Repeat some sanity checks to cover a packed -> unpacked mismatch if |
| * the verifier allows it. |
| */ |
| if (f >= agfl_size || l >= agfl_size) |
| return true; |
| if (c > agfl_size) |
| return true; |
| |
| /* |
| * Check consistency between the on-disk count and the active range. An |
| * agfl padding mismatch manifests as an inconsistent flcount. |
| */ |
| if (c && l >= f) |
| active = l - f + 1; |
| else if (c) |
| active = agfl_size - f + l + 1; |
| else |
| active = 0; |
| |
| return active != c; |
| } |
| |
| /* |
| * Reset the agfl to an empty state. Ignore/drop any existing blocks since the |
| * agfl content cannot be trusted. Warn the user that a repair is required to |
| * recover leaked blocks. |
| * |
| * The purpose of this mechanism is to handle filesystems affected by the agfl |
| * header padding mismatch problem. A reset keeps the filesystem online with a |
| * relatively minor free space accounting inconsistency rather than suffer the |
| * inevitable crash from use of an invalid agfl block. |
| */ |
| static void |
| xfs_agfl_reset( |
| struct xfs_trans *tp, |
| struct xfs_buf *agbp, |
| struct xfs_perag *pag) |
| { |
| struct xfs_mount *mp = tp->t_mountp; |
| struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); |
| |
| ASSERT(pag->pagf_agflreset); |
| trace_xfs_agfl_reset(mp, agf, 0, _RET_IP_); |
| |
| xfs_warn(mp, |
| "WARNING: Reset corrupted AGFL on AG %u. %d blocks leaked. " |
| "Please unmount and run xfs_repair.", |
| pag->pag_agno, pag->pagf_flcount); |
| |
| agf->agf_flfirst = 0; |
| agf->agf_fllast = cpu_to_be32(xfs_agfl_size(mp) - 1); |
| agf->agf_flcount = 0; |
| xfs_alloc_log_agf(tp, agbp, XFS_AGF_FLFIRST | XFS_AGF_FLLAST | |
| XFS_AGF_FLCOUNT); |
| |
| pag->pagf_flcount = 0; |
| pag->pagf_agflreset = false; |
| } |
| |
| /* |
| * Defer an AGFL block free. This is effectively equivalent to |
| * xfs_bmap_add_free() with some special handling particular to AGFL blocks. |
| * |
| * Deferring AGFL frees helps prevent log reservation overruns due to too many |
| * allocation operations in a transaction. AGFL frees are prone to this problem |
| * because for one they are always freed one at a time. Further, an immediate |
| * AGFL block free can cause a btree join and require another block free before |
| * the real allocation can proceed. Deferring the free disconnects freeing up |
| * the AGFL slot from freeing the block. |
| */ |
| STATIC void |
| xfs_defer_agfl_block( |
| struct xfs_trans *tp, |
| xfs_agnumber_t agno, |
| xfs_fsblock_t agbno, |
| struct xfs_owner_info *oinfo) |
| { |
| struct xfs_mount *mp = tp->t_mountp; |
| struct xfs_extent_free_item *new; /* new element */ |
| |
| ASSERT(xfs_bmap_free_item_zone != NULL); |
| ASSERT(oinfo != NULL); |
| |
| new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP); |
| new->xefi_startblock = XFS_AGB_TO_FSB(mp, agno, agbno); |
| new->xefi_blockcount = 1; |
| new->xefi_oinfo = *oinfo; |
| |
| trace_xfs_agfl_free_defer(mp, agno, 0, agbno, 1); |
| |
| xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_AGFL_FREE, &new->xefi_list); |
| } |
| |
| /* |
| * Decide whether to use this allocation group for this allocation. |
| * If so, fix up the btree freelist's size. |
| */ |
| int /* error */ |
| xfs_alloc_fix_freelist( |
| struct xfs_alloc_arg *args, /* allocation argument structure */ |
| int flags) /* XFS_ALLOC_FLAG_... */ |
| { |
| struct xfs_mount *mp = args->mp; |
| struct xfs_perag *pag = args->pag; |
| struct xfs_trans *tp = args->tp; |
| struct xfs_buf *agbp = NULL; |
| struct xfs_buf *agflbp = NULL; |
| struct xfs_alloc_arg targs; /* local allocation arguments */ |
| xfs_agblock_t bno; /* freelist block */ |
| xfs_extlen_t need; /* total blocks needed in freelist */ |
| int error = 0; |
| |
| /* deferred ops (AGFL block frees) require permanent transactions */ |
| ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); |
| |
| if (!pag->pagf_init) { |
| error = xfs_alloc_read_agf(mp, tp, args->agno, flags, &agbp); |
| if (error) |
| goto out_no_agbp; |
| if (!pag->pagf_init) { |
| ASSERT(flags & XFS_ALLOC_FLAG_TRYLOCK); |
| ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); |
| goto out_agbp_relse; |
| } |
| } |
| |
| /* |
| * If this is a metadata preferred pag and we are user data then try |
| * somewhere else if we are not being asked to try harder at this |
| * point |
| */ |
| if (pag->pagf_metadata && xfs_alloc_is_userdata(args->datatype) && |
| (flags & XFS_ALLOC_FLAG_TRYLOCK)) { |
| ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); |
| goto out_agbp_relse; |
| } |
| |
| need = xfs_alloc_min_freelist(mp, pag); |
| if (!xfs_alloc_space_available(args, need, flags | |
| XFS_ALLOC_FLAG_CHECK)) |
| goto out_agbp_relse; |
| |
| /* |
| * Get the a.g. freespace buffer. |
| * Can fail if we're not blocking on locks, and it's held. |
| */ |
| if (!agbp) { |
| error = xfs_alloc_read_agf(mp, tp, args->agno, flags, &agbp); |
| if (error) |
| goto out_no_agbp; |
| if (!agbp) { |
| ASSERT(flags & XFS_ALLOC_FLAG_TRYLOCK); |
| ASSERT(!(flags & XFS_ALLOC_FLAG_FREEING)); |
| goto out_no_agbp; |
| } |
| } |
| |
| /* reset a padding mismatched agfl before final free space check */ |
| if (pag->pagf_agflreset) |
| xfs_agfl_reset(tp, agbp, pag); |
| |
| /* If there isn't enough total space or single-extent, reject it. */ |
| need = xfs_alloc_min_freelist(mp, pag); |
| if (!xfs_alloc_space_available(args, need, flags)) |
| goto out_agbp_relse; |
| |
| /* |
| * Make the freelist shorter if it's too long. |
| * |
| * Note that from this point onwards, we will always release the agf and |
| * agfl buffers on error. This handles the case where we error out and |
| * the buffers are clean or may not have been joined to the transaction |
| * and hence need to be released manually. If they have been joined to |
| * the transaction, then xfs_trans_brelse() will handle them |
| * appropriately based on the recursion count and dirty state of the |
| * buffer. |
| * |
| * XXX (dgc): When we have lots of free space, does this buy us |
| * anything other than extra overhead when we need to put more blocks |
| * back on the free list? Maybe we should only do this when space is |
| * getting low or the AGFL is more than half full? |
| * |
| * The NOSHRINK flag prevents the AGFL from being shrunk if it's too |
| * big; the NORMAP flag prevents AGFL expand/shrink operations from |
| * updating the rmapbt. Both flags are used in xfs_repair while we're |
| * rebuilding the rmapbt, and neither are used by the kernel. They're |
| * both required to ensure that rmaps are correctly recorded for the |
| * regenerated AGFL, bnobt, and cntbt. See repair/phase5.c and |
| * repair/rmap.c in xfsprogs for details. |
| */ |
| memset(&targs, 0, sizeof(targs)); |
| /* struct copy below */ |
| if (flags & XFS_ALLOC_FLAG_NORMAP) |
| targs.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE; |
| else |
| targs.oinfo = XFS_RMAP_OINFO_AG; |
| while (!(flags & XFS_ALLOC_FLAG_NOSHRINK) && pag->pagf_flcount > need) { |
| error = xfs_alloc_get_freelist(tp, agbp, &bno, 0); |
| if (error) |
| goto out_agbp_relse; |
| |
| /* defer agfl frees */ |
| xfs_defer_agfl_block(tp, args->agno, bno, &targs.oinfo); |
| } |
| |
| targs.tp = tp; |
| targs.mp = mp; |
| targs.agbp = agbp; |
| targs.agno = args->agno; |
| targs.alignment = targs.minlen = targs.prod = 1; |
| targs.type = XFS_ALLOCTYPE_THIS_AG; |
| targs.pag = pag; |
| error = xfs_alloc_read_agfl(mp, tp, targs.agno, &agflbp); |
| if (error) |
| goto out_agbp_relse; |
| |
| /* Make the freelist longer if it's too short. */ |
| while (pag->pagf_flcount < need) { |
| targs.agbno = 0; |
| targs.maxlen = need - pag->pagf_flcount; |
| targs.resv = XFS_AG_RESV_AGFL; |
| |
| /* Allocate as many blocks as possible at once. */ |
| error = xfs_alloc_ag_vextent(&targs); |
| if (error) |
| goto out_agflbp_relse; |
| |
| /* |
| * Stop if we run out. Won't happen if callers are obeying |
| * the restrictions correctly. Can happen for free calls |
| * on a completely full ag. |
| */ |
| if (targs.agbno == NULLAGBLOCK) { |
| if (flags & XFS_ALLOC_FLAG_FREEING) |
| break; |
| goto out_agflbp_relse; |
| } |
| /* |
| * Put each allocated block on the list. |
| */ |
| for (bno = targs.agbno; bno < targs.agbno + targs.len; bno++) { |
| error = xfs_alloc_put_freelist(tp, agbp, |
| agflbp, bno, 0); |
| if (error) |
| goto out_agflbp_relse; |
| } |
| } |
| xfs_trans_brelse(tp, agflbp); |
| args->agbp = agbp; |
| return 0; |
| |
| out_agflbp_relse: |
| xfs_trans_brelse(tp, agflbp); |
| out_agbp_relse: |
| if (agbp) |
| xfs_trans_brelse(tp, agbp); |
| out_no_agbp: |
| args->agbp = NULL; |
| return error; |
| } |
| |
| /* |
| * Get a block from the freelist. |
| * Returns with the buffer for the block gotten. |
| */ |
| int /* error */ |
| xfs_alloc_get_freelist( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_buf_t *agbp, /* buffer containing the agf structure */ |
| xfs_agblock_t *bnop, /* block address retrieved from freelist */ |
| int btreeblk) /* destination is a AGF btree */ |
| { |
| xfs_agf_t *agf; /* a.g. freespace structure */ |
| xfs_buf_t *agflbp;/* buffer for a.g. freelist structure */ |
| xfs_agblock_t bno; /* block number returned */ |
| __be32 *agfl_bno; |
| int error; |
| int logflags; |
| xfs_mount_t *mp = tp->t_mountp; |
| xfs_perag_t *pag; /* per allocation group data */ |
| |
| /* |
| * Freelist is empty, give up. |
| */ |
| agf = XFS_BUF_TO_AGF(agbp); |
| if (!agf->agf_flcount) { |
| *bnop = NULLAGBLOCK; |
| return 0; |
| } |
| /* |
| * Read the array of free blocks. |
| */ |
| error = xfs_alloc_read_agfl(mp, tp, be32_to_cpu(agf->agf_seqno), |
| &agflbp); |
| if (error) |
| return error; |
| |
| |
| /* |
| * Get the block number and update the data structures. |
| */ |
| agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp); |
| bno = be32_to_cpu(agfl_bno[be32_to_cpu(agf->agf_flfirst)]); |
| be32_add_cpu(&agf->agf_flfirst, 1); |
| xfs_trans_brelse(tp, agflbp); |
| if (be32_to_cpu(agf->agf_flfirst) == xfs_agfl_size(mp)) |
| agf->agf_flfirst = 0; |
| |
| pag = xfs_perag_get(mp, be32_to_cpu(agf->agf_seqno)); |
| ASSERT(!pag->pagf_agflreset); |
| be32_add_cpu(&agf->agf_flcount, -1); |
| xfs_trans_agflist_delta(tp, -1); |
| pag->pagf_flcount--; |
| |
| logflags = XFS_AGF_FLFIRST | XFS_AGF_FLCOUNT; |
| if (btreeblk) { |
| be32_add_cpu(&agf->agf_btreeblks, 1); |
| pag->pagf_btreeblks++; |
| logflags |= XFS_AGF_BTREEBLKS; |
| } |
| xfs_perag_put(pag); |
| |
| xfs_alloc_log_agf(tp, agbp, logflags); |
| *bnop = bno; |
| |
| return 0; |
| } |
| |
| /* |
| * Log the given fields from the agf structure. |
| */ |
| void |
| xfs_alloc_log_agf( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_buf_t *bp, /* buffer for a.g. freelist header */ |
| int fields) /* mask of fields to be logged (XFS_AGF_...) */ |
| { |
| int first; /* first byte offset */ |
| int last; /* last byte offset */ |
| static const short offsets[] = { |
| offsetof(xfs_agf_t, agf_magicnum), |
| offsetof(xfs_agf_t, agf_versionnum), |
| offsetof(xfs_agf_t, agf_seqno), |
| offsetof(xfs_agf_t, agf_length), |
| offsetof(xfs_agf_t, agf_roots[0]), |
| offsetof(xfs_agf_t, agf_levels[0]), |
| offsetof(xfs_agf_t, agf_flfirst), |
| offsetof(xfs_agf_t, agf_fllast), |
| offsetof(xfs_agf_t, agf_flcount), |
| offsetof(xfs_agf_t, agf_freeblks), |
| offsetof(xfs_agf_t, agf_longest), |
| offsetof(xfs_agf_t, agf_btreeblks), |
| offsetof(xfs_agf_t, agf_uuid), |
| offsetof(xfs_agf_t, agf_rmap_blocks), |
| offsetof(xfs_agf_t, agf_refcount_blocks), |
| offsetof(xfs_agf_t, agf_refcount_root), |
| offsetof(xfs_agf_t, agf_refcount_level), |
| /* needed so that we don't log the whole rest of the structure: */ |
| offsetof(xfs_agf_t, agf_spare64), |
| sizeof(xfs_agf_t) |
| }; |
| |
| trace_xfs_agf(tp->t_mountp, XFS_BUF_TO_AGF(bp), fields, _RET_IP_); |
| |
| xfs_trans_buf_set_type(tp, bp, XFS_BLFT_AGF_BUF); |
| |
| xfs_btree_offsets(fields, offsets, XFS_AGF_NUM_BITS, &first, &last); |
| xfs_trans_log_buf(tp, bp, (uint)first, (uint)last); |
| } |
| |
| /* |
| * Interface for inode allocation to force the pag data to be initialized. |
| */ |
| int /* error */ |
| xfs_alloc_pagf_init( |
| xfs_mount_t *mp, /* file system mount structure */ |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_agnumber_t agno, /* allocation group number */ |
| int flags) /* XFS_ALLOC_FLAGS_... */ |
| { |
| xfs_buf_t *bp; |
| int error; |
| |
| if ((error = xfs_alloc_read_agf(mp, tp, agno, flags, &bp))) |
| return error; |
| if (bp) |
| xfs_trans_brelse(tp, bp); |
| return 0; |
| } |
| |
| /* |
| * Put the block on the freelist for the allocation group. |
| */ |
| int /* error */ |
| xfs_alloc_put_freelist( |
| xfs_trans_t *tp, /* transaction pointer */ |
| xfs_buf_t *agbp, /* buffer for a.g. freelist header */ |
| xfs_buf_t *agflbp,/* buffer for a.g. free block array */ |
| xfs_agblock_t bno, /* block being freed */ |
| int btreeblk) /* block came from a AGF btree */ |
| { |
| xfs_agf_t *agf; /* a.g. freespace structure */ |
| __be32 *blockp;/* pointer to array entry */ |
| int error; |
| int logflags; |
| xfs_mount_t *mp; /* mount structure */ |
| xfs_perag_t *pag; /* per allocation group data */ |
| __be32 *agfl_bno; |
| int startoff; |
| |
| agf = XFS_BUF_TO_AGF(agbp); |
| mp = tp->t_mountp; |
| |
| if (!agflbp && (error = xfs_alloc_read_agfl(mp, tp, |
| be32_to_cpu(agf->agf_seqno), &agflbp))) |
| return error; |
| be32_add_cpu(&agf->agf_fllast, 1); |
| if (be32_to_cpu(agf->agf_fllast) == xfs_agfl_size(mp)) |
| agf->agf_fllast = 0; |
| |
| pag = xfs_perag_get(mp, be32_to_cpu(agf->agf_seqno)); |
| ASSERT(!pag->pagf_agflreset); |
| be32_add_cpu(&agf->agf_flcount, 1); |
| xfs_trans_agflist_delta(tp, 1); |
| pag->pagf_flcount++; |
| |
| logflags = XFS_AGF_FLLAST | XFS_AGF_FLCOUNT; |
| if (btreeblk) { |
| be32_add_cpu(&agf->agf_btreeblks, -1); |
| pag->pagf_btreeblks--; |
| logflags |= XFS_AGF_BTREEBLKS; |
| } |
| xfs_perag_put(pag); |
| |
| xfs_alloc_log_agf(tp, agbp, logflags); |
| |
| ASSERT(be32_to_cpu(agf->agf_flcount) <= xfs_agfl_size(mp)); |
| |
| agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp); |
| blockp = &agfl_bno[be32_to_cpu(agf->agf_fllast)]; |
| *blockp = cpu_to_be32(bno); |
| startoff = (char *)blockp - (char *)agflbp->b_addr; |
| |
| xfs_alloc_log_agf(tp, agbp, logflags); |
| |
| xfs_trans_buf_set_type(tp, agflbp, XFS_BLFT_AGFL_BUF); |
| xfs_trans_log_buf(tp, agflbp, startoff, |
| startoff + sizeof(xfs_agblock_t) - 1); |
| return 0; |
| } |
| |
| static xfs_failaddr_t |
| xfs_agf_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| struct xfs_agf *agf = XFS_BUF_TO_AGF(bp); |
| |
| if (xfs_sb_version_hascrc(&mp->m_sb)) { |
| if (!uuid_equal(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid)) |
| return __this_address; |
| if (!xfs_log_check_lsn(mp, |
| be64_to_cpu(XFS_BUF_TO_AGF(bp)->agf_lsn))) |
| return __this_address; |
| } |
| |
| if (!xfs_verify_magic(bp, agf->agf_magicnum)) |
| return __this_address; |
| |
| if (!(XFS_AGF_GOOD_VERSION(be32_to_cpu(agf->agf_versionnum)) && |
| be32_to_cpu(agf->agf_freeblks) <= be32_to_cpu(agf->agf_length) && |
| be32_to_cpu(agf->agf_flfirst) < xfs_agfl_size(mp) && |
| be32_to_cpu(agf->agf_fllast) < xfs_agfl_size(mp) && |
| be32_to_cpu(agf->agf_flcount) <= xfs_agfl_size(mp))) |
| return __this_address; |
| |
| if (be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) < 1 || |
| be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]) < 1 || |
| be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]) > XFS_BTREE_MAXLEVELS || |
| be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]) > XFS_BTREE_MAXLEVELS) |
| return __this_address; |
| |
| if (xfs_sb_version_hasrmapbt(&mp->m_sb) && |
| (be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]) < 1 || |
| be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]) > XFS_BTREE_MAXLEVELS)) |
| return __this_address; |
| |
| /* |
| * during growfs operations, the perag is not fully initialised, |
| * so we can't use it for any useful checking. growfs ensures we can't |
| * use it by using uncached buffers that don't have the perag attached |
| * so we can detect and avoid this problem. |
| */ |
| if (bp->b_pag && be32_to_cpu(agf->agf_seqno) != bp->b_pag->pag_agno) |
| return __this_address; |
| |
| if (xfs_sb_version_haslazysbcount(&mp->m_sb) && |
| be32_to_cpu(agf->agf_btreeblks) > be32_to_cpu(agf->agf_length)) |
| return __this_address; |
| |
| if (xfs_sb_version_hasreflink(&mp->m_sb) && |
| (be32_to_cpu(agf->agf_refcount_level) < 1 || |
| be32_to_cpu(agf->agf_refcount_level) > XFS_BTREE_MAXLEVELS)) |
| return __this_address; |
| |
| return NULL; |
| |
| } |
| |
| static void |
| xfs_agf_read_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| xfs_failaddr_t fa; |
| |
| if (xfs_sb_version_hascrc(&mp->m_sb) && |
| !xfs_buf_verify_cksum(bp, XFS_AGF_CRC_OFF)) |
| xfs_verifier_error(bp, -EFSBADCRC, __this_address); |
| else { |
| fa = xfs_agf_verify(bp); |
| if (XFS_TEST_ERROR(fa, mp, XFS_ERRTAG_ALLOC_READ_AGF)) |
| xfs_verifier_error(bp, -EFSCORRUPTED, fa); |
| } |
| } |
| |
| static void |
| xfs_agf_write_verify( |
| struct xfs_buf *bp) |
| { |
| struct xfs_mount *mp = bp->b_target->bt_mount; |
| struct xfs_buf_log_item *bip = bp->b_log_item; |
| xfs_failaddr_t fa; |
| |
| fa = xfs_agf_verify(bp); |
| if (fa) { |
| xfs_verifier_error(bp, -EFSCORRUPTED, fa); |
| return; |
| } |
| |
| if (!xfs_sb_version_hascrc(&mp->m_sb)) |
| return; |
| |
| if (bip) |
| XFS_BUF_TO_AGF(bp)->agf_lsn = cpu_to_be64(bip->bli_item.li_lsn); |
| |
| xfs_buf_update_cksum(bp, XFS_AGF_CRC_OFF); |
| } |
| |
| const struct xfs_buf_ops xfs_agf_buf_ops = { |
| .name = "xfs_agf", |
| .magic = { cpu_to_be32(XFS_AGF_MAGIC), cpu_to_be32(XFS_AGF_MAGIC) }, |
| .verify_read = xfs_agf_read_verify, |
| .verify_write = xfs_agf_write_verify, |
| .verify_struct = xfs_agf_verify, |
| }; |
| |
| /* |
| * Read in the allocation group header (free/alloc section). |
| */ |
| int /* error */ |
| xfs_read_agf( |
| struct xfs_mount *mp, /* mount point structure */ |
| struct xfs_trans *tp, /* transaction pointer */ |
| xfs_agnumber_t agno, /* allocation group number */ |
| int flags, /* XFS_BUF_ */ |
| struct xfs_buf **bpp) /* buffer for the ag freelist header */ |
| { |
| int error; |
| |
| trace_xfs_read_agf(mp, agno); |
| |
| ASSERT(agno != NULLAGNUMBER); |
| error = xfs_trans_read_buf( |
| mp, tp, mp->m_ddev_targp, |
| XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)), |
| XFS_FSS_TO_BB(mp, 1), flags, bpp, &xfs_agf_buf_ops); |
| if (error) |
| return error; |
| if (!*bpp) |
| return 0; |
| |
| ASSERT(!(*bpp)->b_error); |
| xfs_buf_set_ref(*bpp, XFS_AGF_REF); |
| return 0; |
| } |
| |
| /* |
| * Read in the allocation group header (free/alloc section). |
| */ |
| int /* error */ |
| xfs_alloc_read_agf( |
| struct xfs_mount *mp, /* mount point structure */ |
| struct xfs_trans *tp, /* transaction pointer */ |
| xfs_agnumber_t agno, /* allocation group number */ |
| int flags, /* XFS_ALLOC_FLAG_... */ |
| struct xfs_buf **bpp) /* buffer for the ag freelist header */ |
| { |
| struct xfs_agf *agf; /* ag freelist header */ |
| struct xfs_perag *pag; /* per allocation group data */ |
| int error; |
| |
| trace_xfs_alloc_read_agf(mp, agno); |
| |
| ASSERT(agno != NULLAGNUMBER); |
| error = xfs_read_agf(mp, tp, agno, |
| (flags & XFS_ALLOC_FLAG_TRYLOCK) ? XBF_TRYLOCK : 0, |
| bpp); |
| if (error) |
| return error; |
| if (!*bpp) |
| return 0; |
| ASSERT(!(*bpp)->b_error); |
| |
| agf = XFS_BUF_TO_AGF(*bpp); |
| pag = xfs_perag_get(mp, agno); |
| if (!pag->pagf_init) { |
| pag->pagf_freeblks = be32_to_cpu(agf->agf_freeblks); |
| pag->pagf_btreeblks = be32_to_cpu(agf->agf_btreeblks); |
| pag->pagf_flcount = be32_to_cpu(agf->agf_flcount); |
| pag->pagf_longest = be32_to_cpu(agf->agf_longest); |
| pag->pagf_levels[XFS_BTNUM_BNOi] = |
| be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNOi]); |
| pag->pagf_levels[XFS_BTNUM_CNTi] = |
| be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi]); |
| pag->pagf_levels[XFS_BTNUM_RMAPi] = |
| be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAPi]); |
| pag->pagf_refcount_level = be32_to_cpu(agf->agf_refcount_level); |
| pag->pagf_init = 1; |
| pag->pagf_agflreset = xfs_agfl_needs_reset(mp, agf); |
| } |
| #ifdef DEBUG |
| else if (!XFS_FORCED_SHUTDOWN(mp)) { |
| ASSERT(pag->pagf_freeblks == be32_to_cpu(agf->agf_freeblks)); |
| ASSERT(pag->pagf_btreeblks == be32_to_cpu(agf->agf_btreeblks)); |
| ASSERT(pag->pagf_flcount == be32_to_cpu(agf->agf_flcount)); |
| ASSERT(pag->pagf_longest == be32_to_cpu(agf->agf_longest)); |
| ASSERT(pag->pagf_levels[XFS_BTNUM_BNOi] == |
| be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNOi])); |
| ASSERT(pag->pagf_levels[XFS_BTNUM_CNTi] == |
| be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi])); |
| } |
| #endif |
| xfs_perag_put(pag); |
| return 0; |
| } |
| |
| /* |
| * Allocate an extent (variable-size). |
| * Depending on the allocation type, we either look in a single allocation |
| * group or loop over the allocation groups to find the result. |
| */ |
| int /* error */ |
| xfs_alloc_vextent( |
| struct xfs_alloc_arg *args) /* allocation argument structure */ |
| { |
| xfs_agblock_t agsize; /* allocation group size */ |
| int error; |
| int flags; /* XFS_ALLOC_FLAG_... locking flags */ |
| struct xfs_mount *mp; /* mount structure pointer */ |
| xfs_agnumber_t sagno; /* starting allocation group number */ |
| xfs_alloctype_t type; /* input allocation type */ |
| int bump_rotor = 0; |
| xfs_agnumber_t rotorstep = xfs_rotorstep; /* inode32 agf stepper */ |
| |
| mp = args->mp; |
| type = args->otype = args->type; |
| args->agbno = NULLAGBLOCK; |
| /* |
| * Just fix this up, for the case where the last a.g. is shorter |
| * (or there's only one a.g.) and the caller couldn't easily figure |
| * that out (xfs_bmap_alloc). |
| */ |
| agsize = mp->m_sb.sb_agblocks; |
| if (args->maxlen > agsize) |
| args->maxlen = agsize; |
| if (args->alignment == 0) |
| args->alignment = 1; |
| ASSERT(XFS_FSB_TO_AGNO(mp, args->fsbno) < mp->m_sb.sb_agcount); |
| ASSERT(XFS_FSB_TO_AGBNO(mp, args->fsbno) < agsize); |
| ASSERT(args->minlen <= args->maxlen); |
| ASSERT(args->minlen <= agsize); |
| ASSERT(args->mod < args->prod); |
| if (XFS_FSB_TO_AGNO(mp, args->fsbno) >= mp->m_sb.sb_agcount || |
| XFS_FSB_TO_AGBNO(mp, args->fsbno) >= agsize || |
| args->minlen > args->maxlen || args->minlen > agsize || |
| args->mod >= args->prod) { |
| args->fsbno = NULLFSBLOCK; |
| trace_xfs_alloc_vextent_badargs(args); |
| return 0; |
| } |
| |
| switch (type) { |
| case XFS_ALLOCTYPE_THIS_AG: |
| case XFS_ALLOCTYPE_NEAR_BNO: |
| case XFS_ALLOCTYPE_THIS_BNO: |
| /* |
| * These three force us into a single a.g. |
| */ |
| args->agno = XFS_FSB_TO_AGNO(mp, args->fsbno); |
| args->pag = xfs_perag_get(mp, args->agno); |
| error = xfs_alloc_fix_freelist(args, 0); |
| if (error) { |
| trace_xfs_alloc_vextent_nofix(args); |
| goto error0; |
| } |
| if (!args->agbp) { |
| trace_xfs_alloc_vextent_noagbp(args); |
| break; |
| } |
| args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno); |
| if ((error = xfs_alloc_ag_vextent(args))) |
| goto error0; |
| break; |
| case XFS_ALLOCTYPE_START_BNO: |
| /* |
| * Try near allocation first, then anywhere-in-ag after |
| * the first a.g. fails. |
| */ |
| if ((args->datatype & XFS_ALLOC_INITIAL_USER_DATA) && |
| (mp->m_flags & XFS_MOUNT_32BITINODES)) { |
| args->fsbno = XFS_AGB_TO_FSB(mp, |
| ((mp->m_agfrotor / rotorstep) % |
| mp->m_sb.sb_agcount), 0); |
| bump_rotor = 1; |
| } |
| args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno); |
| args->type = XFS_ALLOCTYPE_NEAR_BNO; |
| /* FALLTHROUGH */ |
| case XFS_ALLOCTYPE_FIRST_AG: |
| /* |
| * Rotate through the allocation groups looking for a winner. |
| */ |
| if (type == XFS_ALLOCTYPE_FIRST_AG) { |
| /* |
| * Start with allocation group given by bno. |
| */ |
| args->agno = XFS_FSB_TO_AGNO(mp, args->fsbno); |
| args->type = XFS_ALLOCTYPE_THIS_AG; |
| sagno = 0; |
| flags = 0; |
| } else { |
| /* |
| * Start with the given allocation group. |
| */ |
| args->agno = sagno = XFS_FSB_TO_AGNO(mp, args->fsbno); |
| flags = XFS_ALLOC_FLAG_TRYLOCK; |
| } |
| /* |
| * Loop over allocation groups twice; first time with |
| * trylock set, second time without. |
| */ |
| for (;;) { |
| args->pag = xfs_perag_get(mp, args->agno); |
| error = xfs_alloc_fix_freelist(args, flags); |
| if (error) { |
| trace_xfs_alloc_vextent_nofix(args); |
| goto error0; |
| } |
| /* |
| * If we get a buffer back then the allocation will fly. |
| */ |
| if (args->agbp) { |
| if ((error = xfs_alloc_ag_vextent(args))) |
| goto error0; |
| break; |
| } |
| |
| trace_xfs_alloc_vextent_loopfailed(args); |
| |
| /* |
| * Didn't work, figure out the next iteration. |
| */ |
| if (args->agno == sagno && |
| type == XFS_ALLOCTYPE_START_BNO) |
| args->type = XFS_ALLOCTYPE_THIS_AG; |
| /* |
| * For the first allocation, we can try any AG to get |
| * space. However, if we already have allocated a |
| * block, we don't want to try AGs whose number is below |
| * sagno. Otherwise, we may end up with out-of-order |
| * locking of AGF, which might cause deadlock. |
| */ |
| if (++(args->agno) == mp->m_sb.sb_agcount) { |
| if (args->tp->t_firstblock != NULLFSBLOCK) |
| args->agno = sagno; |
| else |
| args->agno = 0; |
| } |
| /* |
| * Reached the starting a.g., must either be done |
| * or switch to non-trylock mode. |
| */ |
| if (args->agno == sagno) { |
| if (flags == 0) { |
| args->agbno = NULLAGBLOCK; |
| trace_xfs_alloc_vextent_allfailed(args); |
| break; |
| } |
| |
| flags = 0; |
| if (type == XFS_ALLOCTYPE_START_BNO) { |
| args->agbno = XFS_FSB_TO_AGBNO(mp, |
| args->fsbno); |
| args->type = XFS_ALLOCTYPE_NEAR_BNO; |
| } |
| } |
| xfs_perag_put(args->pag); |
| } |
| if (bump_rotor) { |
| if (args->agno == sagno) |
| mp->m_agfrotor = (mp->m_agfrotor + 1) % |
| (mp->m_sb.sb_agcount * rotorstep); |
| else |
| mp->m_agfrotor = (args->agno * rotorstep + 1) % |
| (mp->m_sb.sb_agcount * rotorstep); |
| } |
| break; |
| default: |
| ASSERT(0); |
| /* NOTREACHED */ |
| } |
| if (args->agbno == NULLAGBLOCK) |
| args->fsbno = NULLFSBLOCK; |
| else { |
| args->fsbno = XFS_AGB_TO_FSB(mp, args->agno, args->agbno); |
| #ifdef DEBUG |
| ASSERT(args->len >= args->minlen); |
| ASSERT(args->len <= args->maxlen); |
| ASSERT(args->agbno % args->alignment == 0); |
| XFS_AG_CHECK_DADDR(mp, XFS_FSB_TO_DADDR(mp, args->fsbno), |
| args->len); |
| #endif |
| |
| /* Zero the extent if we were asked to do so */ |
| if (args->datatype & XFS_ALLOC_USERDATA_ZERO) { |
| error = xfs_zero_extent(args->ip, args->fsbno, args->len); |
| if (error) |
| goto error0; |
| } |
| |
| } |
| xfs_perag_put(args->pag); |
| return 0; |
| error0: |
| xfs_perag_put(args->pag); |
| return error; |
| } |
| |
| /* Ensure that the freelist is at full capacity. */ |
| int |
| xfs_free_extent_fix_freelist( |
| struct xfs_trans *tp, |
| xfs_agnumber_t agno, |
| struct xfs_buf **agbp) |
| { |
| struct xfs_alloc_arg args; |
| int error; |
| |
| memset(&args, 0, sizeof(struct xfs_alloc_arg)); |
| args.tp = tp; |
| args.mp = tp->t_mountp; |
| args.agno = agno; |
| |
| /* |
| * validate that the block number is legal - the enables us to detect |
| * and handle a silent filesystem corruption rather than crashing. |
| */ |
| if (args.agno >= args.mp->m_sb.sb_agcount) |
| return -EFSCORRUPTED; |
| |
| args.pag = xfs_perag_get(args.mp, args.agno); |
| ASSERT(args.pag); |
| |
| error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING); |
| if (error) |
| goto out; |
| |
| *agbp = args.agbp; |
| out: |
| xfs_perag_put(args.pag); |
| return error; |
| } |
| |
| /* |
| * Free an extent. |
| * Just break up the extent address and hand off to xfs_free_ag_extent |
| * after fixing up the freelist. |
| */ |
| int |
| __xfs_free_extent( |
| struct xfs_trans *tp, |
| xfs_fsblock_t bno, |
| xfs_extlen_t len, |
| const struct xfs_owner_info *oinfo, |
| enum xfs_ag_resv_type type, |
| bool skip_discard) |
| { |
| struct xfs_mount *mp = tp->t_mountp; |
| struct xfs_buf *agbp; |
| xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, bno); |
| xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(mp, bno); |
| int error; |
| unsigned int busy_flags = 0; |
| |
| ASSERT(len != 0); |
| ASSERT(type != XFS_AG_RESV_AGFL); |
| |
| if (XFS_TEST_ERROR(false, mp, |
| XFS_ERRTAG_FREE_EXTENT)) |
| return -EIO; |
| |
| error = xfs_free_extent_fix_freelist(tp, agno, &agbp); |
| if (error) |
| return error; |
| |
| XFS_WANT_CORRUPTED_GOTO(mp, agbno < mp->m_sb.sb_agblocks, err); |
| |
| /* validate the extent size is legal now we have the agf locked */ |
| XFS_WANT_CORRUPTED_GOTO(mp, |
| agbno + len <= be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_length), |
| err); |
| |
| error = xfs_free_ag_extent(tp, agbp, agno, agbno, len, oinfo, type); |
| if (error) |
| goto err; |
| |
| if (skip_discard) |
| busy_flags |= XFS_EXTENT_BUSY_SKIP_DISCARD; |
| xfs_extent_busy_insert(tp, agno, agbno, len, busy_flags); |
| return 0; |
| |
| err: |
| xfs_trans_brelse(tp, agbp); |
| return error; |
| } |
| |
| struct xfs_alloc_query_range_info { |
| xfs_alloc_query_range_fn fn; |
| void *priv; |
| }; |
| |
| /* Format btree record and pass to our callback. */ |
| STATIC int |
| xfs_alloc_query_range_helper( |
| struct xfs_btree_cur *cur, |
| union xfs_btree_rec *rec, |
| void *priv) |
| { |
| struct xfs_alloc_query_range_info *query = priv; |
| struct xfs_alloc_rec_incore irec; |
| |
| irec.ar_startblock = be32_to_cpu(rec->alloc.ar_startblock); |
| irec.ar_blockcount = be32_to_cpu(rec->alloc.ar_blockcount); |
| return query->fn(cur, &irec, query->priv); |
| } |
| |
| /* Find all free space within a given range of blocks. */ |
| int |
| xfs_alloc_query_range( |
| struct xfs_btree_cur *cur, |
| struct xfs_alloc_rec_incore *low_rec, |
| struct xfs_alloc_rec_incore *high_rec, |
| xfs_alloc_query_range_fn fn, |
| void *priv) |
| { |
| union xfs_btree_irec low_brec; |
| union xfs_btree_irec high_brec; |
| struct xfs_alloc_query_range_info query; |
| |
| ASSERT(cur->bc_btnum == XFS_BTNUM_BNO); |
| low_brec.a = *low_rec; |
| high_brec.a = *high_rec; |
| query.priv = priv; |
| query.fn = fn; |
| return xfs_btree_query_range(cur, &low_brec, &high_brec, |
| xfs_alloc_query_range_helper, &query); |
| } |
| |
| /* Find all free space records. */ |
| int |
| xfs_alloc_query_all( |
| struct xfs_btree_cur *cur, |
| xfs_alloc_query_range_fn fn, |
| void *priv) |
| { |
| struct xfs_alloc_query_range_info query; |
| |
| ASSERT(cur->bc_btnum == XFS_BTNUM_BNO); |
| query.priv = priv; |
| query.fn = fn; |
| return xfs_btree_query_all(cur, xfs_alloc_query_range_helper, &query); |
| } |
| |
| /* Is there a record covering a given extent? */ |
| int |
| xfs_alloc_has_record( |
| struct xfs_btree_cur *cur, |
| xfs_agblock_t bno, |
| xfs_extlen_t len, |
| bool *exists) |
| { |
| union xfs_btree_irec low; |
| union xfs_btree_irec high; |
| |
| memset(&low, 0, sizeof(low)); |
| low.a.ar_startblock = bno; |
| memset(&high, 0xFF, sizeof(high)); |
| high.a.ar_startblock = bno + len - 1; |
| |
| return xfs_btree_has_record(cur, &low, &high, exists); |
| } |
| |
| /* |
| * Walk all the blocks in the AGFL. The @walk_fn can return any negative |
| * error code or XFS_BTREE_QUERY_RANGE_ABORT. |
| */ |
| int |
| xfs_agfl_walk( |
| struct xfs_mount *mp, |
| struct xfs_agf *agf, |
| struct xfs_buf *agflbp, |
| xfs_agfl_walk_fn walk_fn, |
| void *priv) |
| { |
| __be32 *agfl_bno; |
| unsigned int i; |
| int error; |
| |
| agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, agflbp); |
| i = be32_to_cpu(agf->agf_flfirst); |
| |
| /* Nothing to walk in an empty AGFL. */ |
| if (agf->agf_flcount == cpu_to_be32(0)) |
| return 0; |
| |
| /* Otherwise, walk from first to last, wrapping as needed. */ |
| for (;;) { |
| error = walk_fn(mp, be32_to_cpu(agfl_bno[i]), priv); |
| if (error) |
| return error; |
| if (i == be32_to_cpu(agf->agf_fllast)) |
| break; |
| if (++i == xfs_agfl_size(mp)) |
| i = 0; |
| } |
| |
| return 0; |
| } |