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41e6362183
When we call xfs_forced_shutdown(), the caller often expects the filesystem to be completely shut down when it returns. However, if we have racing xfs_forced_shutdown() calls, the first caller sets the mount shutdown flag then goes to shutdown the log. The second caller sees the mount shutdown flag and returns immediately - it does not wait for the log to be shut down. Unfortunately, xfs_forced_shutdown() is used in some places that expect it to completely shut down the filesystem before it returns (e.g. xfs_trans_log_inode()). As such, returning before the log has been shut down leaves us in a place where the transaction failed to complete correctly but we still call xfs_trans_commit(). This situation arises because xfs_trans_log_inode() does not return an error and instead calls xfs_force_shutdown() to ensure that the transaction being committed is aborted. Unfortunately, we have a race condition where xfs_trans_commit() needs to check xlog_is_shutdown() because it can't abort log items before the log is shut down, but it needs to use xfs_is_shutdown() because xfs_forced_shutdown() does not block waiting for the log to shut down. To fix this conundrum, first we make all calls to xfs_forced_shutdown() block until the log is also shut down. This means we can then safely use xfs_forced_shutdown() as a mechanism that ensures the currently running transaction will be aborted by xfs_trans_commit() regardless of the shutdown check it uses. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
606 lines
15 KiB
C
606 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_sb.h"
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#include "xfs_mount.h"
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#include "xfs_trans.h"
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#include "xfs_error.h"
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#include "xfs_alloc.h"
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#include "xfs_fsops.h"
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#include "xfs_trans_space.h"
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#include "xfs_log.h"
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#include "xfs_log_priv.h"
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#include "xfs_ag.h"
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#include "xfs_ag_resv.h"
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#include "xfs_trace.h"
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/*
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* Write new AG headers to disk. Non-transactional, but need to be
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* written and completed prior to the growfs transaction being logged.
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* To do this, we use a delayed write buffer list and wait for
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* submission and IO completion of the list as a whole. This allows the
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* IO subsystem to merge all the AG headers in a single AG into a single
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* IO and hide most of the latency of the IO from us.
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*
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* This also means that if we get an error whilst building the buffer
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* list to write, we can cancel the entire list without having written
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* anything.
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*/
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static int
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xfs_resizefs_init_new_ags(
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struct xfs_trans *tp,
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struct aghdr_init_data *id,
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xfs_agnumber_t oagcount,
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xfs_agnumber_t nagcount,
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xfs_rfsblock_t delta,
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bool *lastag_extended)
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{
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struct xfs_mount *mp = tp->t_mountp;
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xfs_rfsblock_t nb = mp->m_sb.sb_dblocks + delta;
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int error;
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*lastag_extended = false;
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INIT_LIST_HEAD(&id->buffer_list);
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for (id->agno = nagcount - 1;
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id->agno >= oagcount;
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id->agno--, delta -= id->agsize) {
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if (id->agno == nagcount - 1)
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id->agsize = nb - (id->agno *
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(xfs_rfsblock_t)mp->m_sb.sb_agblocks);
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else
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id->agsize = mp->m_sb.sb_agblocks;
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error = xfs_ag_init_headers(mp, id);
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if (error) {
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xfs_buf_delwri_cancel(&id->buffer_list);
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return error;
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}
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}
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error = xfs_buf_delwri_submit(&id->buffer_list);
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if (error)
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return error;
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if (delta) {
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*lastag_extended = true;
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error = xfs_ag_extend_space(mp, tp, id, delta);
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}
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return error;
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}
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/*
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* growfs operations
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*/
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static int
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xfs_growfs_data_private(
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struct xfs_mount *mp, /* mount point for filesystem */
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struct xfs_growfs_data *in) /* growfs data input struct */
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{
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struct xfs_buf *bp;
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int error;
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xfs_agnumber_t nagcount;
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xfs_agnumber_t nagimax = 0;
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xfs_rfsblock_t nb, nb_div, nb_mod;
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int64_t delta;
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bool lastag_extended;
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xfs_agnumber_t oagcount;
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struct xfs_trans *tp;
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struct aghdr_init_data id = {};
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nb = in->newblocks;
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error = xfs_sb_validate_fsb_count(&mp->m_sb, nb);
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if (error)
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return error;
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if (nb > mp->m_sb.sb_dblocks) {
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error = xfs_buf_read_uncached(mp->m_ddev_targp,
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XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
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XFS_FSS_TO_BB(mp, 1), 0, &bp, NULL);
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if (error)
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return error;
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xfs_buf_relse(bp);
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}
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nb_div = nb;
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nb_mod = do_div(nb_div, mp->m_sb.sb_agblocks);
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nagcount = nb_div + (nb_mod != 0);
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if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
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nagcount--;
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nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
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}
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delta = nb - mp->m_sb.sb_dblocks;
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/*
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* Reject filesystems with a single AG because they are not
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* supported, and reject a shrink operation that would cause a
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* filesystem to become unsupported.
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*/
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if (delta < 0 && nagcount < 2)
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return -EINVAL;
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oagcount = mp->m_sb.sb_agcount;
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/* allocate the new per-ag structures */
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if (nagcount > oagcount) {
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error = xfs_initialize_perag(mp, nagcount, &nagimax);
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if (error)
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return error;
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} else if (nagcount < oagcount) {
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/* TODO: shrinking the entire AGs hasn't yet completed */
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return -EINVAL;
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}
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
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(delta > 0 ? XFS_GROWFS_SPACE_RES(mp) : -delta), 0,
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XFS_TRANS_RESERVE, &tp);
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if (error)
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return error;
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if (delta > 0) {
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error = xfs_resizefs_init_new_ags(tp, &id, oagcount, nagcount,
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delta, &lastag_extended);
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} else {
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static struct ratelimit_state shrink_warning = \
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RATELIMIT_STATE_INIT("shrink_warning", 86400 * HZ, 1);
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ratelimit_set_flags(&shrink_warning, RATELIMIT_MSG_ON_RELEASE);
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if (__ratelimit(&shrink_warning))
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xfs_alert(mp,
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"EXPERIMENTAL online shrink feature in use. Use at your own risk!");
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error = xfs_ag_shrink_space(mp, &tp, nagcount - 1, -delta);
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}
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if (error)
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goto out_trans_cancel;
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/*
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* Update changed superblock fields transactionally. These are not
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* seen by the rest of the world until the transaction commit applies
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* them atomically to the superblock.
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*/
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if (nagcount > oagcount)
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xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
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if (delta)
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xfs_trans_mod_sb(tp, XFS_TRANS_SB_DBLOCKS, delta);
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if (id.nfree)
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xfs_trans_mod_sb(tp, XFS_TRANS_SB_FDBLOCKS, id.nfree);
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/*
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* Sync sb counters now to reflect the updated values. This is
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* particularly important for shrink because the write verifier
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* will fail if sb_fdblocks is ever larger than sb_dblocks.
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*/
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if (xfs_has_lazysbcount(mp))
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xfs_log_sb(tp);
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xfs_trans_set_sync(tp);
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error = xfs_trans_commit(tp);
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if (error)
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return error;
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/* New allocation groups fully initialized, so update mount struct */
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if (nagimax)
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mp->m_maxagi = nagimax;
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xfs_set_low_space_thresholds(mp);
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mp->m_alloc_set_aside = xfs_alloc_set_aside(mp);
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if (delta > 0) {
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/*
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* If we expanded the last AG, free the per-AG reservation
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* so we can reinitialize it with the new size.
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*/
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if (lastag_extended) {
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struct xfs_perag *pag;
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pag = xfs_perag_get(mp, id.agno);
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error = xfs_ag_resv_free(pag);
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xfs_perag_put(pag);
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if (error)
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return error;
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}
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/*
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* Reserve AG metadata blocks. ENOSPC here does not mean there
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* was a growfs failure, just that there still isn't space for
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* new user data after the grow has been run.
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*/
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error = xfs_fs_reserve_ag_blocks(mp);
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if (error == -ENOSPC)
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error = 0;
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}
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return error;
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out_trans_cancel:
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xfs_trans_cancel(tp);
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return error;
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}
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static int
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xfs_growfs_log_private(
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struct xfs_mount *mp, /* mount point for filesystem */
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struct xfs_growfs_log *in) /* growfs log input struct */
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{
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xfs_extlen_t nb;
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nb = in->newblocks;
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if (nb < XFS_MIN_LOG_BLOCKS || nb < XFS_B_TO_FSB(mp, XFS_MIN_LOG_BYTES))
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return -EINVAL;
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if (nb == mp->m_sb.sb_logblocks &&
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in->isint == (mp->m_sb.sb_logstart != 0))
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return -EINVAL;
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/*
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* Moving the log is hard, need new interfaces to sync
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* the log first, hold off all activity while moving it.
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* Can have shorter or longer log in the same space,
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* or transform internal to external log or vice versa.
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*/
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return -ENOSYS;
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}
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static int
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xfs_growfs_imaxpct(
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struct xfs_mount *mp,
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__u32 imaxpct)
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{
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struct xfs_trans *tp;
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int dpct;
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int error;
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if (imaxpct > 100)
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return -EINVAL;
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
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XFS_GROWFS_SPACE_RES(mp), 0, XFS_TRANS_RESERVE, &tp);
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if (error)
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return error;
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dpct = imaxpct - mp->m_sb.sb_imax_pct;
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xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
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xfs_trans_set_sync(tp);
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return xfs_trans_commit(tp);
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}
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/*
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* protected versions of growfs function acquire and release locks on the mount
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* point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
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* XFS_IOC_FSGROWFSRT
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*/
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int
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xfs_growfs_data(
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struct xfs_mount *mp,
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struct xfs_growfs_data *in)
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{
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int error = 0;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!mutex_trylock(&mp->m_growlock))
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return -EWOULDBLOCK;
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/* update imaxpct separately to the physical grow of the filesystem */
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if (in->imaxpct != mp->m_sb.sb_imax_pct) {
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error = xfs_growfs_imaxpct(mp, in->imaxpct);
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if (error)
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goto out_error;
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}
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if (in->newblocks != mp->m_sb.sb_dblocks) {
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error = xfs_growfs_data_private(mp, in);
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if (error)
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goto out_error;
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}
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/* Post growfs calculations needed to reflect new state in operations */
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if (mp->m_sb.sb_imax_pct) {
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uint64_t icount = mp->m_sb.sb_dblocks * mp->m_sb.sb_imax_pct;
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do_div(icount, 100);
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M_IGEO(mp)->maxicount = XFS_FSB_TO_INO(mp, icount);
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} else
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M_IGEO(mp)->maxicount = 0;
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/* Update secondary superblocks now the physical grow has completed */
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error = xfs_update_secondary_sbs(mp);
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out_error:
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/*
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* Increment the generation unconditionally, the error could be from
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* updating the secondary superblocks, in which case the new size
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* is live already.
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*/
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mp->m_generation++;
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mutex_unlock(&mp->m_growlock);
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return error;
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}
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int
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xfs_growfs_log(
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xfs_mount_t *mp,
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struct xfs_growfs_log *in)
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{
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int error;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (!mutex_trylock(&mp->m_growlock))
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return -EWOULDBLOCK;
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error = xfs_growfs_log_private(mp, in);
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mutex_unlock(&mp->m_growlock);
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return error;
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}
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/*
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* exported through ioctl XFS_IOC_FSCOUNTS
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*/
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void
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xfs_fs_counts(
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xfs_mount_t *mp,
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xfs_fsop_counts_t *cnt)
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{
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cnt->allocino = percpu_counter_read_positive(&mp->m_icount);
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cnt->freeino = percpu_counter_read_positive(&mp->m_ifree);
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cnt->freedata = percpu_counter_read_positive(&mp->m_fdblocks) -
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xfs_fdblocks_unavailable(mp);
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spin_lock(&mp->m_sb_lock);
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cnt->freertx = mp->m_sb.sb_frextents;
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spin_unlock(&mp->m_sb_lock);
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}
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/*
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* exported through ioctl XFS_IOC_SET_RESBLKS & XFS_IOC_GET_RESBLKS
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*
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* xfs_reserve_blocks is called to set m_resblks
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* in the in-core mount table. The number of unused reserved blocks
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* is kept in m_resblks_avail.
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*
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* Reserve the requested number of blocks if available. Otherwise return
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* as many as possible to satisfy the request. The actual number
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* reserved are returned in outval
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*
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* A null inval pointer indicates that only the current reserved blocks
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* available should be returned no settings are changed.
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*/
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int
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xfs_reserve_blocks(
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xfs_mount_t *mp,
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uint64_t *inval,
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xfs_fsop_resblks_t *outval)
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{
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int64_t lcounter, delta;
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int64_t fdblks_delta = 0;
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uint64_t request;
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int64_t free;
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int error = 0;
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/* If inval is null, report current values and return */
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if (inval == (uint64_t *)NULL) {
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if (!outval)
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return -EINVAL;
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outval->resblks = mp->m_resblks;
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outval->resblks_avail = mp->m_resblks_avail;
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return 0;
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}
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request = *inval;
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/*
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* With per-cpu counters, this becomes an interesting problem. we need
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* to work out if we are freeing or allocation blocks first, then we can
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* do the modification as necessary.
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*
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* We do this under the m_sb_lock so that if we are near ENOSPC, we will
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* hold out any changes while we work out what to do. This means that
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* the amount of free space can change while we do this, so we need to
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* retry if we end up trying to reserve more space than is available.
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*/
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spin_lock(&mp->m_sb_lock);
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/*
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* If our previous reservation was larger than the current value,
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* then move any unused blocks back to the free pool. Modify the resblks
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* counters directly since we shouldn't have any problems unreserving
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* space.
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*/
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if (mp->m_resblks > request) {
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lcounter = mp->m_resblks_avail - request;
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if (lcounter > 0) { /* release unused blocks */
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fdblks_delta = lcounter;
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mp->m_resblks_avail -= lcounter;
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}
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mp->m_resblks = request;
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if (fdblks_delta) {
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spin_unlock(&mp->m_sb_lock);
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error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
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spin_lock(&mp->m_sb_lock);
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}
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goto out;
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}
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/*
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* If the request is larger than the current reservation, reserve the
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* blocks before we update the reserve counters. Sample m_fdblocks and
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* perform a partial reservation if the request exceeds free space.
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*
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* The code below estimates how many blocks it can request from
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* fdblocks to stash in the reserve pool. This is a classic TOCTOU
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* race since fdblocks updates are not always coordinated via
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* m_sb_lock. Set the reserve size even if there's not enough free
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* space to fill it because mod_fdblocks will refill an undersized
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* reserve when it can.
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*/
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free = percpu_counter_sum(&mp->m_fdblocks) -
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xfs_fdblocks_unavailable(mp);
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delta = request - mp->m_resblks;
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mp->m_resblks = request;
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if (delta > 0 && free > 0) {
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/*
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* We'll either succeed in getting space from the free block
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* count or we'll get an ENOSPC. Don't set the reserved flag
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* here - we don't want to reserve the extra reserve blocks
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* from the reserve.
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*
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* The desired reserve size can change after we drop the lock.
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* Use mod_fdblocks to put the space into the reserve or into
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* fdblocks as appropriate.
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*/
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fdblks_delta = min(free, delta);
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spin_unlock(&mp->m_sb_lock);
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error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
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if (!error)
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xfs_mod_fdblocks(mp, fdblks_delta, 0);
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spin_lock(&mp->m_sb_lock);
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}
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out:
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if (outval) {
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outval->resblks = mp->m_resblks;
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outval->resblks_avail = mp->m_resblks_avail;
|
|
}
|
|
|
|
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 (!freeze_bdev(mp->m_super->s_bdev)) {
|
|
xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);
|
|
thaw_bdev(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,
|
|
int 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 {
|
|
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.
|
|
*/
|
|
int
|
|
xfs_fs_unreserve_ag_blocks(
|
|
struct xfs_mount *mp)
|
|
{
|
|
xfs_agnumber_t agno;
|
|
struct xfs_perag *pag;
|
|
int error = 0;
|
|
int err2;
|
|
|
|
for_each_perag(mp, agno, pag) {
|
|
err2 = xfs_ag_resv_free(pag);
|
|
if (err2 && !error)
|
|
error = err2;
|
|
}
|
|
|
|
if (error)
|
|
xfs_warn(mp,
|
|
"Error %d freeing per-AG metadata reserve pool.", error);
|
|
|
|
return error;
|
|
}
|