| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_shared.h" |
| #include "xfs_format.h" |
| #include "xfs_log_format.h" |
| #include "xfs_trans_resv.h" |
| #include "xfs_sb.h" |
| #include "xfs_mount.h" |
| #include "xfs_trans.h" |
| #include "xfs_error.h" |
| #include "xfs_alloc.h" |
| #include "xfs_fsops.h" |
| #include "xfs_trans_space.h" |
| #include "xfs_log.h" |
| #include "xfs_log_priv.h" |
| #include "xfs_ag.h" |
| #include "xfs_ag_resv.h" |
| #include "xfs_trace.h" |
| |
| /* |
| * Write new AG headers to disk. Non-transactional, but need to be |
| * written and completed prior to the growfs transaction being logged. |
| * To do this, we use a delayed write buffer list and wait for |
| * submission and IO completion of the list as a whole. This allows the |
| * IO subsystem to merge all the AG headers in a single AG into a single |
| * IO and hide most of the latency of the IO from us. |
| * |
| * This also means that if we get an error whilst building the buffer |
| * list to write, we can cancel the entire list without having written |
| * anything. |
| */ |
| static int |
| xfs_resizefs_init_new_ags( |
| struct xfs_trans *tp, |
| struct aghdr_init_data *id, |
| xfs_agnumber_t oagcount, |
| xfs_agnumber_t nagcount, |
| xfs_rfsblock_t delta, |
| struct xfs_perag *last_pag, |
| bool *lastag_extended) |
| { |
| struct xfs_mount *mp = tp->t_mountp; |
| xfs_rfsblock_t nb = mp->m_sb.sb_dblocks + delta; |
| int error; |
| |
| *lastag_extended = false; |
| |
| INIT_LIST_HEAD(&id->buffer_list); |
| for (id->agno = nagcount - 1; |
| id->agno >= oagcount; |
| id->agno--, delta -= id->agsize) { |
| |
| if (id->agno == nagcount - 1) |
| id->agsize = nb - (id->agno * |
| (xfs_rfsblock_t)mp->m_sb.sb_agblocks); |
| else |
| id->agsize = mp->m_sb.sb_agblocks; |
| |
| error = xfs_ag_init_headers(mp, id); |
| if (error) { |
| xfs_buf_delwri_cancel(&id->buffer_list); |
| return error; |
| } |
| } |
| |
| error = xfs_buf_delwri_submit(&id->buffer_list); |
| if (error) |
| return error; |
| |
| if (delta) { |
| *lastag_extended = true; |
| error = xfs_ag_extend_space(last_pag, tp, delta); |
| } |
| return error; |
| } |
| |
| /* |
| * growfs operations |
| */ |
| static int |
| xfs_growfs_data_private( |
| struct xfs_mount *mp, /* mount point for filesystem */ |
| struct xfs_growfs_data *in) /* growfs data input struct */ |
| { |
| struct xfs_buf *bp; |
| int error; |
| xfs_agnumber_t nagcount; |
| xfs_agnumber_t nagimax = 0; |
| xfs_rfsblock_t nb, nb_div, nb_mod; |
| int64_t delta; |
| bool lastag_extended = false; |
| xfs_agnumber_t oagcount; |
| struct xfs_trans *tp; |
| struct aghdr_init_data id = {}; |
| struct xfs_perag *last_pag; |
| |
| nb = in->newblocks; |
| error = xfs_sb_validate_fsb_count(&mp->m_sb, nb); |
| if (error) |
| return error; |
| |
| if (nb > mp->m_sb.sb_dblocks) { |
| error = xfs_buf_read_uncached(mp->m_ddev_targp, |
| XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1), |
| XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL); |
| if (error) |
| return error; |
| xfs_buf_relse(bp); |
| } |
| |
| nb_div = nb; |
| nb_mod = do_div(nb_div, mp->m_sb.sb_agblocks); |
| if (nb_mod && nb_mod >= XFS_MIN_AG_BLOCKS) |
| nb_div++; |
| else if (nb_mod) |
| nb = nb_div * mp->m_sb.sb_agblocks; |
| |
| if (nb_div > XFS_MAX_AGNUMBER + 1) { |
| nb_div = XFS_MAX_AGNUMBER + 1; |
| nb = nb_div * mp->m_sb.sb_agblocks; |
| } |
| nagcount = nb_div; |
| delta = nb - mp->m_sb.sb_dblocks; |
| /* |
| * Reject filesystems with a single AG because they are not |
| * supported, and reject a shrink operation that would cause a |
| * filesystem to become unsupported. |
| */ |
| if (delta < 0 && nagcount < 2) |
| return -EINVAL; |
| |
| /* No work to do */ |
| if (delta == 0) |
| return 0; |
| |
| oagcount = mp->m_sb.sb_agcount; |
| /* allocate the new per-ag structures */ |
| if (nagcount > oagcount) { |
| error = xfs_initialize_perag(mp, nagcount, nb, &nagimax); |
| if (error) |
| return error; |
| } else if (nagcount < oagcount) { |
| /* TODO: shrinking the entire AGs hasn't yet completed */ |
| return -EINVAL; |
| } |
| |
| if (delta > 0) |
| error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, |
| XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, |
| &tp); |
| else |
| error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, -delta, 0, |
| 0, &tp); |
| if (error) |
| goto out_free_unused_perag; |
| |
| last_pag = xfs_perag_get(mp, oagcount - 1); |
| if (delta > 0) { |
| error = xfs_resizefs_init_new_ags(tp, &id, oagcount, nagcount, |
| delta, last_pag, &lastag_extended); |
| } else { |
| xfs_warn_mount(mp, XFS_OPSTATE_WARNED_SHRINK, |
| "EXPERIMENTAL online shrink feature in use. Use at your own risk!"); |
| |
| error = xfs_ag_shrink_space(last_pag, &tp, -delta); |
| } |
| xfs_perag_put(last_pag); |
| if (error) |
| goto out_trans_cancel; |
| |
| /* |
| * Update changed superblock fields transactionally. These are not |
| * seen by the rest of the world until the transaction commit applies |
| * them atomically to the superblock. |
| */ |
| if (nagcount > oagcount) |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount); |
| if (delta) |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, delta); |
| if (id.nfree) |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree); |
| |
| /* |
| * Sync sb counters now to reflect the updated values. This is |
| * particularly important for shrink because the write verifier |
| * will fail if sb_fdblocks is ever larger than sb_dblocks. |
| */ |
| if (xfs_has_lazysbcount(mp)) |
| xfs_log_sb(tp); |
| |
| xfs_trans_set_sync(tp); |
| error = xfs_trans_commit(tp); |
| if (error) |
| return error; |
| |
| /* New allocation groups fully initialized, so update mount struct */ |
| if (nagimax) |
| mp->m_maxagi = nagimax; |
| xfs_set_low_space_thresholds(mp); |
| mp->m_alloc_set_aside = xfs_alloc_set_aside(mp); |
| |
| if (delta > 0) { |
| /* |
| * If we expanded the last AG, free the per-AG reservation |
| * so we can reinitialize it with the new size. |
| */ |
| if (lastag_extended) { |
| struct xfs_perag *pag; |
| |
| pag = xfs_perag_get(mp, id.agno); |
| xfs_ag_resv_free(pag); |
| xfs_perag_put(pag); |
| } |
| /* |
| * Reserve AG metadata blocks. ENOSPC here does not mean there |
| * was a growfs failure, just that there still isn't space for |
| * new user data after the grow has been run. |
| */ |
| error = xfs_fs_reserve_ag_blocks(mp); |
| if (error == -ENOSPC) |
| error = 0; |
| } |
| return error; |
| |
| out_trans_cancel: |
| xfs_trans_cancel(tp); |
| out_free_unused_perag: |
| if (nagcount > oagcount) |
| xfs_free_unused_perag_range(mp, oagcount, nagcount); |
| return error; |
| } |
| |
| static int |
| xfs_growfs_log_private( |
| struct xfs_mount *mp, /* mount point for filesystem */ |
| struct xfs_growfs_log *in) /* growfs log input struct */ |
| { |
| xfs_extlen_t nb; |
| |
| nb = in->newblocks; |
| if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES)) |
| return -EINVAL; |
| if (nb == mp->m_sb.sb_logblocks && |
| in->isint == (mp->m_sb.sb_logstart != 0)) |
| return -EINVAL; |
| /* |
| * Moving the log is hard, need new interfaces to sync |
| * the log first, hold off all activity while moving it. |
| * Can have shorter or longer log in the same space, |
| * or transform internal to external log or vice versa. |
| */ |
| return -ENOSYS; |
| } |
| |
| static int |
| xfs_growfs_imaxpct( |
| struct xfs_mount *mp, |
| __u32 imaxpct) |
| { |
| struct xfs_trans *tp; |
| int dpct; |
| int error; |
| |
| if (imaxpct > 100) |
| return -EINVAL; |
| |
| error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata, |
| XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp); |
| if (error) |
| return error; |
| |
| dpct = imaxpct - mp->m_sb.sb_imax_pct; |
| xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct); |
| xfs_trans_set_sync(tp); |
| return xfs_trans_commit(tp); |
| } |
| |
| /* |
| * protected versions of growfs function acquire and release locks on the mount |
| * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG, |
| * XFS_IOC_FSGROWFSRT |
| */ |
| int |
| xfs_growfs_data( |
| struct xfs_mount *mp, |
| struct xfs_growfs_data *in) |
| { |
| int error = 0; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| if (!mutex_trylock(&mp->m_growlock)) |
| return -EWOULDBLOCK; |
| |
| /* update imaxpct separately to the physical grow of the filesystem */ |
| if (in->imaxpct != mp->m_sb.sb_imax_pct) { |
| error = xfs_growfs_imaxpct(mp, in->imaxpct); |
| if (error) |
| goto out_error; |
| } |
| |
| if (in->newblocks != mp->m_sb.sb_dblocks) { |
| error = xfs_growfs_data_private(mp, in); |
| if (error) |
| goto out_error; |
| } |
| |
| /* Post growfs calculations needed to reflect new state in operations */ |
| if (mp->m_sb.sb_imax_pct) { |
| uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct; |
| do_div(icount, 100); |
| M_IGEO(mp)->maxicount = XFS_FSB_TO_INO(mp, icount); |
| } else |
| M_IGEO(mp)->maxicount = 0; |
| |
| /* Update secondary superblocks now the physical grow has completed */ |
| error = xfs_update_secondary_sbs(mp); |
| |
| out_error: |
| /* |
| * Increment the generation unconditionally, the error could be from |
| * updating the secondary superblocks, in which case the new size |
| * is live already. |
| */ |
| mp->m_generation++; |
| mutex_unlock(&mp->m_growlock); |
| return error; |
| } |
| |
| int |
| xfs_growfs_log( |
| xfs_mount_t *mp, |
| struct xfs_growfs_log *in) |
| { |
| int error; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| if (!mutex_trylock(&mp->m_growlock)) |
| return -EWOULDBLOCK; |
| error = xfs_growfs_log_private(mp, in); |
| mutex_unlock(&mp->m_growlock); |
| return error; |
| } |
| |
| /* |
| * Reserve the requested number of blocks if available. Otherwise return |
| * as many as possible to satisfy the request. The actual number |
| * reserved are returned in outval. |
| */ |
| int |
| xfs_reserve_blocks( |
| struct xfs_mount *mp, |
| uint64_t request) |
| { |
| int64_t lcounter, delta; |
| int64_t fdblks_delta = 0; |
| int64_t free; |
| int error = 0; |
| |
| /* |
| * With per-cpu counters, this becomes an interesting problem. we need |
| * to work out if we are freeing or allocation blocks first, then we can |
| * do the modification as necessary. |
| * |
| * We do this under the m_sb_lock so that if we are near ENOSPC, we will |
| * hold out any changes while we work out what to do. This means that |
| * the amount of free space can change while we do this, so we need to |
| * retry if we end up trying to reserve more space than is available. |
| */ |
| spin_lock(&mp->m_sb_lock); |
| |
| /* |
| * If our previous reservation was larger than the current value, |
| * then move any unused blocks back to the free pool. Modify the resblks |
| * counters directly since we shouldn't have any problems unreserving |
| * space. |
| */ |
| if (mp->m_resblks > request) { |
| lcounter = mp->m_resblks_avail - request; |
| if (lcounter > 0) { /* release unused blocks */ |
| fdblks_delta = lcounter; |
| mp->m_resblks_avail -= lcounter; |
| } |
| mp->m_resblks = request; |
| if (fdblks_delta) { |
| spin_unlock(&mp->m_sb_lock); |
| xfs_add_fdblocks(mp, fdblks_delta); |
| spin_lock(&mp->m_sb_lock); |
| } |
| |
| goto out; |
| } |
| |
| /* |
| * If the request is larger than the current reservation, reserve the |
| * blocks before we update the reserve counters. Sample m_fdblocks and |
| * perform a partial reservation if the request exceeds free space. |
| * |
| * The code below estimates how many blocks it can request from |
| * fdblocks to stash in the reserve pool. This is a classic TOCTOU |
| * race since fdblocks updates are not always coordinated via |
| * m_sb_lock. Set the reserve size even if there's not enough free |
| * space to fill it because mod_fdblocks will refill an undersized |
| * reserve when it can. |
| */ |
| free = percpu_counter_sum(&mp->m_fdblocks) - |
| xfs_fdblocks_unavailable(mp); |
| delta = request - mp->m_resblks; |
| mp->m_resblks = request; |
| if (delta > 0 && free > 0) { |
| /* |
| * We'll either succeed in getting space from the free block |
| * count or we'll get an ENOSPC. Don't set the reserved flag |
| * here - we don't want to reserve the extra reserve blocks |
| * from the reserve. |
| * |
| * The desired reserve size can change after we drop the lock. |
| * Use mod_fdblocks to put the space into the reserve or into |
| * fdblocks as appropriate. |
| */ |
| fdblks_delta = min(free, delta); |
| spin_unlock(&mp->m_sb_lock); |
| error = xfs_dec_fdblocks(mp, fdblks_delta, 0); |
| if (!error) |
| xfs_add_fdblocks(mp, fdblks_delta); |
| spin_lock(&mp->m_sb_lock); |
| } |
| out: |
| spin_unlock(&mp->m_sb_lock); |
| return error; |
| } |
| |
| int |
| xfs_fs_goingdown( |
| xfs_mount_t *mp, |
| uint32_t inflags) |
| { |
| switch (inflags) { |
| case XFS_FSOP_GOING_FLAGS_DEFAULT: { |
| if (!bdev_freeze(mp->m_super->s_bdev)) { |
| xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); |
| bdev_thaw(mp->m_super->s_bdev); |
| } |
| break; |
| } |
| case XFS_FSOP_GOING_FLAGS_LOGFLUSH: |
| xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); |
| break; |
| case XFS_FSOP_GOING_FLAGS_NOLOGFLUSH: |
| xfs_force_shutdown(mp, |
| SHUTDOWN_FORCE_UMOUNT | SHUTDOWN_LOG_IO_ERROR); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Force a shutdown of the filesystem instantly while keeping the filesystem |
| * consistent. We don't do an unmount here; just shutdown the shop, make sure |
| * that absolutely nothing persistent happens to this filesystem after this |
| * point. |
| * |
| * The shutdown state change is atomic, resulting in the first and only the |
| * first shutdown call processing the shutdown. This means we only shutdown the |
| * log once as it requires, and we don't spam the logs when multiple concurrent |
| * shutdowns race to set the shutdown flags. |
| */ |
| void |
| xfs_do_force_shutdown( |
| struct xfs_mount *mp, |
| uint32_t flags, |
| char *fname, |
| int lnnum) |
| { |
| int tag; |
| const char *why; |
| |
| |
| if (test_and_set_bit(XFS_OPSTATE_SHUTDOWN, &mp->m_opstate)) { |
| xlog_shutdown_wait(mp->m_log); |
| return; |
| } |
| if (mp->m_sb_bp) |
| mp->m_sb_bp->b_flags |= XBF_DONE; |
| |
| if (flags & SHUTDOWN_FORCE_UMOUNT) |
| xfs_alert(mp, "User initiated shutdown received."); |
| |
| if (xlog_force_shutdown(mp->m_log, flags)) { |
| tag = XFS_PTAG_SHUTDOWN_LOGERROR; |
| why = "Log I/O Error"; |
| } else if (flags & SHUTDOWN_CORRUPT_INCORE) { |
| tag = XFS_PTAG_SHUTDOWN_CORRUPT; |
| why = "Corruption of in-memory data"; |
| } else if (flags & SHUTDOWN_CORRUPT_ONDISK) { |
| tag = XFS_PTAG_SHUTDOWN_CORRUPT; |
| why = "Corruption of on-disk metadata"; |
| } else if (flags & SHUTDOWN_DEVICE_REMOVED) { |
| tag = XFS_PTAG_SHUTDOWN_IOERROR; |
| why = "Block device removal"; |
| } else { |
| tag = XFS_PTAG_SHUTDOWN_IOERROR; |
| why = "Metadata I/O Error"; |
| } |
| |
| trace_xfs_force_shutdown(mp, tag, flags, fname, lnnum); |
| |
| xfs_alert_tag(mp, tag, |
| "%s (0x%x) detected at %pS (%s:%d). Shutting down filesystem.", |
| why, flags, __return_address, fname, lnnum); |
| xfs_alert(mp, |
| "Please unmount the filesystem and rectify the problem(s)"); |
| if (xfs_error_level >= XFS_ERRLEVEL_HIGH) |
| xfs_stack_trace(); |
| } |
| |
| /* |
| * Reserve free space for per-AG metadata. |
| */ |
| int |
| xfs_fs_reserve_ag_blocks( |
| struct xfs_mount *mp) |
| { |
| xfs_agnumber_t agno; |
| struct xfs_perag *pag; |
| int error = 0; |
| int err2; |
| |
| mp->m_finobt_nores = false; |
| for_each_perag(mp, agno, pag) { |
| err2 = xfs_ag_resv_init(pag, NULL); |
| if (err2 && !error) |
| error = err2; |
| } |
| |
| if (error && error != -ENOSPC) { |
| xfs_warn(mp, |
| "Error %d reserving per-AG metadata reserve pool.", error); |
| xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); |
| } |
| |
| return error; |
| } |
| |
| /* |
| * Free space reserved for per-AG metadata. |
| */ |
| void |
| xfs_fs_unreserve_ag_blocks( |
| struct xfs_mount *mp) |
| { |
| xfs_agnumber_t agno; |
| struct xfs_perag *pag; |
| |
| for_each_perag(mp, agno, pag) |
| xfs_ag_resv_free(pag); |
| } |