v4.19.13 snapshot.
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
new file mode 100644
index 0000000..912b42f
--- /dev/null
+++ b/fs/xfs/xfs_trans.c
@@ -0,0 +1,1113 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * Copyright (C) 2010 Red Hat, 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_mount.h"
+#include "xfs_inode.h"
+#include "xfs_extent_busy.h"
+#include "xfs_quota.h"
+#include "xfs_trans.h"
+#include "xfs_trans_priv.h"
+#include "xfs_log.h"
+#include "xfs_trace.h"
+#include "xfs_error.h"
+#include "xfs_defer.h"
+
+kmem_zone_t *xfs_trans_zone;
+
+#if defined(CONFIG_TRACEPOINTS)
+static void
+xfs_trans_trace_reservations(
+ struct xfs_mount *mp)
+{
+ struct xfs_trans_res resv;
+ struct xfs_trans_res *res;
+ struct xfs_trans_res *end_res;
+ int i;
+
+ res = (struct xfs_trans_res *)M_RES(mp);
+ end_res = (struct xfs_trans_res *)(M_RES(mp) + 1);
+ for (i = 0; res < end_res; i++, res++)
+ trace_xfs_trans_resv_calc(mp, i, res);
+ xfs_log_get_max_trans_res(mp, &resv);
+ trace_xfs_trans_resv_calc(mp, -1, &resv);
+}
+#else
+# define xfs_trans_trace_reservations(mp)
+#endif
+
+/*
+ * Initialize the precomputed transaction reservation values
+ * in the mount structure.
+ */
+void
+xfs_trans_init(
+ struct xfs_mount *mp)
+{
+ xfs_trans_resv_calc(mp, M_RES(mp));
+ xfs_trans_trace_reservations(mp);
+}
+
+/*
+ * Free the transaction structure. If there is more clean up
+ * to do when the structure is freed, add it here.
+ */
+STATIC void
+xfs_trans_free(
+ struct xfs_trans *tp)
+{
+ xfs_extent_busy_sort(&tp->t_busy);
+ xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
+
+ trace_xfs_trans_free(tp, _RET_IP_);
+ atomic_dec(&tp->t_mountp->m_active_trans);
+ if (!(tp->t_flags & XFS_TRANS_NO_WRITECOUNT))
+ sb_end_intwrite(tp->t_mountp->m_super);
+ xfs_trans_free_dqinfo(tp);
+ kmem_zone_free(xfs_trans_zone, tp);
+}
+
+/*
+ * This is called to create a new transaction which will share the
+ * permanent log reservation of the given transaction. The remaining
+ * unused block and rt extent reservations are also inherited. This
+ * implies that the original transaction is no longer allowed to allocate
+ * blocks. Locks and log items, however, are no inherited. They must
+ * be added to the new transaction explicitly.
+ */
+STATIC struct xfs_trans *
+xfs_trans_dup(
+ struct xfs_trans *tp)
+{
+ struct xfs_trans *ntp;
+
+ trace_xfs_trans_dup(tp, _RET_IP_);
+
+ ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
+
+ /*
+ * Initialize the new transaction structure.
+ */
+ ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
+ ntp->t_mountp = tp->t_mountp;
+ INIT_LIST_HEAD(&ntp->t_items);
+ INIT_LIST_HEAD(&ntp->t_busy);
+ INIT_LIST_HEAD(&ntp->t_dfops);
+ ntp->t_firstblock = NULLFSBLOCK;
+
+ ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
+ ASSERT(tp->t_ticket != NULL);
+
+ ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
+ (tp->t_flags & XFS_TRANS_RESERVE) |
+ (tp->t_flags & XFS_TRANS_NO_WRITECOUNT);
+ /* We gave our writer reference to the new transaction */
+ tp->t_flags |= XFS_TRANS_NO_WRITECOUNT;
+ ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
+
+ ASSERT(tp->t_blk_res >= tp->t_blk_res_used);
+ ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
+ tp->t_blk_res = tp->t_blk_res_used;
+
+ ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
+ tp->t_rtx_res = tp->t_rtx_res_used;
+ ntp->t_pflags = tp->t_pflags;
+
+ /* move deferred ops over to the new tp */
+ xfs_defer_move(ntp, tp);
+
+ xfs_trans_dup_dqinfo(tp, ntp);
+
+ atomic_inc(&tp->t_mountp->m_active_trans);
+ return ntp;
+}
+
+/*
+ * This is called to reserve free disk blocks and log space for the
+ * given transaction. This must be done before allocating any resources
+ * within the transaction.
+ *
+ * This will return ENOSPC if there are not enough blocks available.
+ * It will sleep waiting for available log space.
+ * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
+ * is used by long running transactions. If any one of the reservations
+ * fails then they will all be backed out.
+ *
+ * This does not do quota reservations. That typically is done by the
+ * caller afterwards.
+ */
+static int
+xfs_trans_reserve(
+ struct xfs_trans *tp,
+ struct xfs_trans_res *resp,
+ uint blocks,
+ uint rtextents)
+{
+ int error = 0;
+ bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
+
+ /* Mark this thread as being in a transaction */
+ current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
+
+ /*
+ * Attempt to reserve the needed disk blocks by decrementing
+ * the number needed from the number available. This will
+ * fail if the count would go below zero.
+ */
+ if (blocks > 0) {
+ error = xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
+ if (error != 0) {
+ current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
+ return -ENOSPC;
+ }
+ tp->t_blk_res += blocks;
+ }
+
+ /*
+ * Reserve the log space needed for this transaction.
+ */
+ if (resp->tr_logres > 0) {
+ bool permanent = false;
+
+ ASSERT(tp->t_log_res == 0 ||
+ tp->t_log_res == resp->tr_logres);
+ ASSERT(tp->t_log_count == 0 ||
+ tp->t_log_count == resp->tr_logcount);
+
+ if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
+ tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
+ permanent = true;
+ } else {
+ ASSERT(tp->t_ticket == NULL);
+ ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
+ }
+
+ if (tp->t_ticket != NULL) {
+ ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
+ error = xfs_log_regrant(tp->t_mountp, tp->t_ticket);
+ } else {
+ error = xfs_log_reserve(tp->t_mountp,
+ resp->tr_logres,
+ resp->tr_logcount,
+ &tp->t_ticket, XFS_TRANSACTION,
+ permanent);
+ }
+
+ if (error)
+ goto undo_blocks;
+
+ tp->t_log_res = resp->tr_logres;
+ tp->t_log_count = resp->tr_logcount;
+ }
+
+ /*
+ * Attempt to reserve the needed realtime extents by decrementing
+ * the number needed from the number available. This will
+ * fail if the count would go below zero.
+ */
+ if (rtextents > 0) {
+ error = xfs_mod_frextents(tp->t_mountp, -((int64_t)rtextents));
+ if (error) {
+ error = -ENOSPC;
+ goto undo_log;
+ }
+ tp->t_rtx_res += rtextents;
+ }
+
+ return 0;
+
+ /*
+ * Error cases jump to one of these labels to undo any
+ * reservations which have already been performed.
+ */
+undo_log:
+ if (resp->tr_logres > 0) {
+ xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, false);
+ tp->t_ticket = NULL;
+ tp->t_log_res = 0;
+ tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
+ }
+
+undo_blocks:
+ if (blocks > 0) {
+ xfs_mod_fdblocks(tp->t_mountp, (int64_t)blocks, rsvd);
+ tp->t_blk_res = 0;
+ }
+
+ current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
+
+ return error;
+}
+
+int
+xfs_trans_alloc(
+ struct xfs_mount *mp,
+ struct xfs_trans_res *resp,
+ uint blocks,
+ uint rtextents,
+ uint flags,
+ struct xfs_trans **tpp)
+{
+ struct xfs_trans *tp;
+ int error;
+
+ /*
+ * Allocate the handle before we do our freeze accounting and setting up
+ * GFP_NOFS allocation context so that we avoid lockdep false positives
+ * by doing GFP_KERNEL allocations inside sb_start_intwrite().
+ */
+ tp = kmem_zone_zalloc(xfs_trans_zone,
+ (flags & XFS_TRANS_NOFS) ? KM_NOFS : KM_SLEEP);
+
+ if (!(flags & XFS_TRANS_NO_WRITECOUNT))
+ sb_start_intwrite(mp->m_super);
+
+ /*
+ * Zero-reservation ("empty") transactions can't modify anything, so
+ * they're allowed to run while we're frozen.
+ */
+ WARN_ON(resp->tr_logres > 0 &&
+ mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
+ atomic_inc(&mp->m_active_trans);
+
+ tp->t_magic = XFS_TRANS_HEADER_MAGIC;
+ tp->t_flags = flags;
+ tp->t_mountp = mp;
+ INIT_LIST_HEAD(&tp->t_items);
+ INIT_LIST_HEAD(&tp->t_busy);
+ INIT_LIST_HEAD(&tp->t_dfops);
+ tp->t_firstblock = NULLFSBLOCK;
+
+ error = xfs_trans_reserve(tp, resp, blocks, rtextents);
+ if (error) {
+ xfs_trans_cancel(tp);
+ return error;
+ }
+
+ trace_xfs_trans_alloc(tp, _RET_IP_);
+
+ *tpp = tp;
+ return 0;
+}
+
+/*
+ * Create an empty transaction with no reservation. This is a defensive
+ * mechanism for routines that query metadata without actually modifying
+ * them -- if the metadata being queried is somehow cross-linked (think a
+ * btree block pointer that points higher in the tree), we risk deadlock.
+ * However, blocks grabbed as part of a transaction can be re-grabbed.
+ * The verifiers will notice the corrupt block and the operation will fail
+ * back to userspace without deadlocking.
+ *
+ * Note the zero-length reservation; this transaction MUST be cancelled
+ * without any dirty data.
+ */
+int
+xfs_trans_alloc_empty(
+ struct xfs_mount *mp,
+ struct xfs_trans **tpp)
+{
+ struct xfs_trans_res resv = {0};
+
+ return xfs_trans_alloc(mp, &resv, 0, 0, XFS_TRANS_NO_WRITECOUNT, tpp);
+}
+
+/*
+ * Record the indicated change to the given field for application
+ * to the file system's superblock when the transaction commits.
+ * For now, just store the change in the transaction structure.
+ *
+ * Mark the transaction structure to indicate that the superblock
+ * needs to be updated before committing.
+ *
+ * Because we may not be keeping track of allocated/free inodes and
+ * used filesystem blocks in the superblock, we do not mark the
+ * superblock dirty in this transaction if we modify these fields.
+ * We still need to update the transaction deltas so that they get
+ * applied to the incore superblock, but we don't want them to
+ * cause the superblock to get locked and logged if these are the
+ * only fields in the superblock that the transaction modifies.
+ */
+void
+xfs_trans_mod_sb(
+ xfs_trans_t *tp,
+ uint field,
+ int64_t delta)
+{
+ uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
+ xfs_mount_t *mp = tp->t_mountp;
+
+ switch (field) {
+ case XFS_TRANS_SB_ICOUNT:
+ tp->t_icount_delta += delta;
+ if (xfs_sb_version_haslazysbcount(&mp->m_sb))
+ flags &= ~XFS_TRANS_SB_DIRTY;
+ break;
+ case XFS_TRANS_SB_IFREE:
+ tp->t_ifree_delta += delta;
+ if (xfs_sb_version_haslazysbcount(&mp->m_sb))
+ flags &= ~XFS_TRANS_SB_DIRTY;
+ break;
+ case XFS_TRANS_SB_FDBLOCKS:
+ /*
+ * Track the number of blocks allocated in the transaction.
+ * Make sure it does not exceed the number reserved. If so,
+ * shutdown as this can lead to accounting inconsistency.
+ */
+ if (delta < 0) {
+ tp->t_blk_res_used += (uint)-delta;
+ if (tp->t_blk_res_used > tp->t_blk_res)
+ xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
+ }
+ tp->t_fdblocks_delta += delta;
+ if (xfs_sb_version_haslazysbcount(&mp->m_sb))
+ flags &= ~XFS_TRANS_SB_DIRTY;
+ break;
+ case XFS_TRANS_SB_RES_FDBLOCKS:
+ /*
+ * The allocation has already been applied to the
+ * in-core superblock's counter. This should only
+ * be applied to the on-disk superblock.
+ */
+ tp->t_res_fdblocks_delta += delta;
+ if (xfs_sb_version_haslazysbcount(&mp->m_sb))
+ flags &= ~XFS_TRANS_SB_DIRTY;
+ break;
+ case XFS_TRANS_SB_FREXTENTS:
+ /*
+ * Track the number of blocks allocated in the
+ * transaction. Make sure it does not exceed the
+ * number reserved.
+ */
+ if (delta < 0) {
+ tp->t_rtx_res_used += (uint)-delta;
+ ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
+ }
+ tp->t_frextents_delta += delta;
+ break;
+ case XFS_TRANS_SB_RES_FREXTENTS:
+ /*
+ * The allocation has already been applied to the
+ * in-core superblock's counter. This should only
+ * be applied to the on-disk superblock.
+ */
+ ASSERT(delta < 0);
+ tp->t_res_frextents_delta += delta;
+ break;
+ case XFS_TRANS_SB_DBLOCKS:
+ ASSERT(delta > 0);
+ tp->t_dblocks_delta += delta;
+ break;
+ case XFS_TRANS_SB_AGCOUNT:
+ ASSERT(delta > 0);
+ tp->t_agcount_delta += delta;
+ break;
+ case XFS_TRANS_SB_IMAXPCT:
+ tp->t_imaxpct_delta += delta;
+ break;
+ case XFS_TRANS_SB_REXTSIZE:
+ tp->t_rextsize_delta += delta;
+ break;
+ case XFS_TRANS_SB_RBMBLOCKS:
+ tp->t_rbmblocks_delta += delta;
+ break;
+ case XFS_TRANS_SB_RBLOCKS:
+ tp->t_rblocks_delta += delta;
+ break;
+ case XFS_TRANS_SB_REXTENTS:
+ tp->t_rextents_delta += delta;
+ break;
+ case XFS_TRANS_SB_REXTSLOG:
+ tp->t_rextslog_delta += delta;
+ break;
+ default:
+ ASSERT(0);
+ return;
+ }
+
+ tp->t_flags |= flags;
+}
+
+/*
+ * xfs_trans_apply_sb_deltas() is called from the commit code
+ * to bring the superblock buffer into the current transaction
+ * and modify it as requested by earlier calls to xfs_trans_mod_sb().
+ *
+ * For now we just look at each field allowed to change and change
+ * it if necessary.
+ */
+STATIC void
+xfs_trans_apply_sb_deltas(
+ xfs_trans_t *tp)
+{
+ xfs_dsb_t *sbp;
+ xfs_buf_t *bp;
+ int whole = 0;
+
+ bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
+ sbp = XFS_BUF_TO_SBP(bp);
+
+ /*
+ * Check that superblock mods match the mods made to AGF counters.
+ */
+ ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
+ (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
+ tp->t_ag_btree_delta));
+
+ /*
+ * Only update the superblock counters if we are logging them
+ */
+ if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
+ if (tp->t_icount_delta)
+ be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
+ if (tp->t_ifree_delta)
+ be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
+ if (tp->t_fdblocks_delta)
+ be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
+ if (tp->t_res_fdblocks_delta)
+ be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
+ }
+
+ if (tp->t_frextents_delta)
+ be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
+ if (tp->t_res_frextents_delta)
+ be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
+
+ if (tp->t_dblocks_delta) {
+ be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
+ whole = 1;
+ }
+ if (tp->t_agcount_delta) {
+ be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
+ whole = 1;
+ }
+ if (tp->t_imaxpct_delta) {
+ sbp->sb_imax_pct += tp->t_imaxpct_delta;
+ whole = 1;
+ }
+ if (tp->t_rextsize_delta) {
+ be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
+ whole = 1;
+ }
+ if (tp->t_rbmblocks_delta) {
+ be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
+ whole = 1;
+ }
+ if (tp->t_rblocks_delta) {
+ be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
+ whole = 1;
+ }
+ if (tp->t_rextents_delta) {
+ be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
+ whole = 1;
+ }
+ if (tp->t_rextslog_delta) {
+ sbp->sb_rextslog += tp->t_rextslog_delta;
+ whole = 1;
+ }
+
+ xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
+ if (whole)
+ /*
+ * Log the whole thing, the fields are noncontiguous.
+ */
+ xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
+ else
+ /*
+ * Since all the modifiable fields are contiguous, we
+ * can get away with this.
+ */
+ xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
+ offsetof(xfs_dsb_t, sb_frextents) +
+ sizeof(sbp->sb_frextents) - 1);
+}
+
+STATIC int
+xfs_sb_mod8(
+ uint8_t *field,
+ int8_t delta)
+{
+ int8_t counter = *field;
+
+ counter += delta;
+ if (counter < 0) {
+ ASSERT(0);
+ return -EINVAL;
+ }
+ *field = counter;
+ return 0;
+}
+
+STATIC int
+xfs_sb_mod32(
+ uint32_t *field,
+ int32_t delta)
+{
+ int32_t counter = *field;
+
+ counter += delta;
+ if (counter < 0) {
+ ASSERT(0);
+ return -EINVAL;
+ }
+ *field = counter;
+ return 0;
+}
+
+STATIC int
+xfs_sb_mod64(
+ uint64_t *field,
+ int64_t delta)
+{
+ int64_t counter = *field;
+
+ counter += delta;
+ if (counter < 0) {
+ ASSERT(0);
+ return -EINVAL;
+ }
+ *field = counter;
+ return 0;
+}
+
+/*
+ * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
+ * and apply superblock counter changes to the in-core superblock. The
+ * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
+ * applied to the in-core superblock. The idea is that that has already been
+ * done.
+ *
+ * If we are not logging superblock counters, then the inode allocated/free and
+ * used block counts are not updated in the on disk superblock. In this case,
+ * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
+ * still need to update the incore superblock with the changes.
+ */
+void
+xfs_trans_unreserve_and_mod_sb(
+ struct xfs_trans *tp)
+{
+ struct xfs_mount *mp = tp->t_mountp;
+ bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
+ int64_t blkdelta = 0;
+ int64_t rtxdelta = 0;
+ int64_t idelta = 0;
+ int64_t ifreedelta = 0;
+ int error;
+
+ /* calculate deltas */
+ if (tp->t_blk_res > 0)
+ blkdelta = tp->t_blk_res;
+ if ((tp->t_fdblocks_delta != 0) &&
+ (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
+ (tp->t_flags & XFS_TRANS_SB_DIRTY)))
+ blkdelta += tp->t_fdblocks_delta;
+
+ if (tp->t_rtx_res > 0)
+ rtxdelta = tp->t_rtx_res;
+ if ((tp->t_frextents_delta != 0) &&
+ (tp->t_flags & XFS_TRANS_SB_DIRTY))
+ rtxdelta += tp->t_frextents_delta;
+
+ if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
+ (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
+ idelta = tp->t_icount_delta;
+ ifreedelta = tp->t_ifree_delta;
+ }
+
+ /* apply the per-cpu counters */
+ if (blkdelta) {
+ error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
+ if (error)
+ goto out;
+ }
+
+ if (idelta) {
+ error = xfs_mod_icount(mp, idelta);
+ if (error)
+ goto out_undo_fdblocks;
+ }
+
+ if (ifreedelta) {
+ error = xfs_mod_ifree(mp, ifreedelta);
+ if (error)
+ goto out_undo_icount;
+ }
+
+ if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
+ return;
+
+ /* apply remaining deltas */
+ spin_lock(&mp->m_sb_lock);
+ if (rtxdelta) {
+ error = xfs_sb_mod64(&mp->m_sb.sb_frextents, rtxdelta);
+ if (error)
+ goto out_undo_ifree;
+ }
+
+ if (tp->t_dblocks_delta != 0) {
+ error = xfs_sb_mod64(&mp->m_sb.sb_dblocks, tp->t_dblocks_delta);
+ if (error)
+ goto out_undo_frextents;
+ }
+ if (tp->t_agcount_delta != 0) {
+ error = xfs_sb_mod32(&mp->m_sb.sb_agcount, tp->t_agcount_delta);
+ if (error)
+ goto out_undo_dblocks;
+ }
+ if (tp->t_imaxpct_delta != 0) {
+ error = xfs_sb_mod8(&mp->m_sb.sb_imax_pct, tp->t_imaxpct_delta);
+ if (error)
+ goto out_undo_agcount;
+ }
+ if (tp->t_rextsize_delta != 0) {
+ error = xfs_sb_mod32(&mp->m_sb.sb_rextsize,
+ tp->t_rextsize_delta);
+ if (error)
+ goto out_undo_imaxpct;
+ }
+ if (tp->t_rbmblocks_delta != 0) {
+ error = xfs_sb_mod32(&mp->m_sb.sb_rbmblocks,
+ tp->t_rbmblocks_delta);
+ if (error)
+ goto out_undo_rextsize;
+ }
+ if (tp->t_rblocks_delta != 0) {
+ error = xfs_sb_mod64(&mp->m_sb.sb_rblocks, tp->t_rblocks_delta);
+ if (error)
+ goto out_undo_rbmblocks;
+ }
+ if (tp->t_rextents_delta != 0) {
+ error = xfs_sb_mod64(&mp->m_sb.sb_rextents,
+ tp->t_rextents_delta);
+ if (error)
+ goto out_undo_rblocks;
+ }
+ if (tp->t_rextslog_delta != 0) {
+ error = xfs_sb_mod8(&mp->m_sb.sb_rextslog,
+ tp->t_rextslog_delta);
+ if (error)
+ goto out_undo_rextents;
+ }
+ spin_unlock(&mp->m_sb_lock);
+ return;
+
+out_undo_rextents:
+ if (tp->t_rextents_delta)
+ xfs_sb_mod64(&mp->m_sb.sb_rextents, -tp->t_rextents_delta);
+out_undo_rblocks:
+ if (tp->t_rblocks_delta)
+ xfs_sb_mod64(&mp->m_sb.sb_rblocks, -tp->t_rblocks_delta);
+out_undo_rbmblocks:
+ if (tp->t_rbmblocks_delta)
+ xfs_sb_mod32(&mp->m_sb.sb_rbmblocks, -tp->t_rbmblocks_delta);
+out_undo_rextsize:
+ if (tp->t_rextsize_delta)
+ xfs_sb_mod32(&mp->m_sb.sb_rextsize, -tp->t_rextsize_delta);
+out_undo_imaxpct:
+ if (tp->t_rextsize_delta)
+ xfs_sb_mod8(&mp->m_sb.sb_imax_pct, -tp->t_imaxpct_delta);
+out_undo_agcount:
+ if (tp->t_agcount_delta)
+ xfs_sb_mod32(&mp->m_sb.sb_agcount, -tp->t_agcount_delta);
+out_undo_dblocks:
+ if (tp->t_dblocks_delta)
+ xfs_sb_mod64(&mp->m_sb.sb_dblocks, -tp->t_dblocks_delta);
+out_undo_frextents:
+ if (rtxdelta)
+ xfs_sb_mod64(&mp->m_sb.sb_frextents, -rtxdelta);
+out_undo_ifree:
+ spin_unlock(&mp->m_sb_lock);
+ if (ifreedelta)
+ xfs_mod_ifree(mp, -ifreedelta);
+out_undo_icount:
+ if (idelta)
+ xfs_mod_icount(mp, -idelta);
+out_undo_fdblocks:
+ if (blkdelta)
+ xfs_mod_fdblocks(mp, -blkdelta, rsvd);
+out:
+ ASSERT(error == 0);
+ return;
+}
+
+/* Add the given log item to the transaction's list of log items. */
+void
+xfs_trans_add_item(
+ struct xfs_trans *tp,
+ struct xfs_log_item *lip)
+{
+ ASSERT(lip->li_mountp == tp->t_mountp);
+ ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
+ ASSERT(list_empty(&lip->li_trans));
+ ASSERT(!test_bit(XFS_LI_DIRTY, &lip->li_flags));
+
+ list_add_tail(&lip->li_trans, &tp->t_items);
+ trace_xfs_trans_add_item(tp, _RET_IP_);
+}
+
+/*
+ * Unlink the log item from the transaction. the log item is no longer
+ * considered dirty in this transaction, as the linked transaction has
+ * finished, either by abort or commit completion.
+ */
+void
+xfs_trans_del_item(
+ struct xfs_log_item *lip)
+{
+ clear_bit(XFS_LI_DIRTY, &lip->li_flags);
+ list_del_init(&lip->li_trans);
+}
+
+/* Detach and unlock all of the items in a transaction */
+void
+xfs_trans_free_items(
+ struct xfs_trans *tp,
+ xfs_lsn_t commit_lsn,
+ bool abort)
+{
+ struct xfs_log_item *lip, *next;
+
+ trace_xfs_trans_free_items(tp, _RET_IP_);
+
+ list_for_each_entry_safe(lip, next, &tp->t_items, li_trans) {
+ xfs_trans_del_item(lip);
+ if (commit_lsn != NULLCOMMITLSN)
+ lip->li_ops->iop_committing(lip, commit_lsn);
+ if (abort)
+ set_bit(XFS_LI_ABORTED, &lip->li_flags);
+ lip->li_ops->iop_unlock(lip);
+ }
+}
+
+static inline void
+xfs_log_item_batch_insert(
+ struct xfs_ail *ailp,
+ struct xfs_ail_cursor *cur,
+ struct xfs_log_item **log_items,
+ int nr_items,
+ xfs_lsn_t commit_lsn)
+{
+ int i;
+
+ spin_lock(&ailp->ail_lock);
+ /* xfs_trans_ail_update_bulk drops ailp->ail_lock */
+ xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
+
+ for (i = 0; i < nr_items; i++) {
+ struct xfs_log_item *lip = log_items[i];
+
+ lip->li_ops->iop_unpin(lip, 0);
+ }
+}
+
+/*
+ * Bulk operation version of xfs_trans_committed that takes a log vector of
+ * items to insert into the AIL. This uses bulk AIL insertion techniques to
+ * minimise lock traffic.
+ *
+ * If we are called with the aborted flag set, it is because a log write during
+ * a CIL checkpoint commit has failed. In this case, all the items in the
+ * checkpoint have already gone through iop_commited and iop_unlock, which
+ * means that checkpoint commit abort handling is treated exactly the same
+ * as an iclog write error even though we haven't started any IO yet. Hence in
+ * this case all we need to do is iop_committed processing, followed by an
+ * iop_unpin(aborted) call.
+ *
+ * The AIL cursor is used to optimise the insert process. If commit_lsn is not
+ * at the end of the AIL, the insert cursor avoids the need to walk
+ * the AIL to find the insertion point on every xfs_log_item_batch_insert()
+ * call. This saves a lot of needless list walking and is a net win, even
+ * though it slightly increases that amount of AIL lock traffic to set it up
+ * and tear it down.
+ */
+void
+xfs_trans_committed_bulk(
+ struct xfs_ail *ailp,
+ struct xfs_log_vec *log_vector,
+ xfs_lsn_t commit_lsn,
+ int aborted)
+{
+#define LOG_ITEM_BATCH_SIZE 32
+ struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
+ struct xfs_log_vec *lv;
+ struct xfs_ail_cursor cur;
+ int i = 0;
+
+ spin_lock(&ailp->ail_lock);
+ xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
+ spin_unlock(&ailp->ail_lock);
+
+ /* unpin all the log items */
+ for (lv = log_vector; lv; lv = lv->lv_next ) {
+ struct xfs_log_item *lip = lv->lv_item;
+ xfs_lsn_t item_lsn;
+
+ if (aborted)
+ set_bit(XFS_LI_ABORTED, &lip->li_flags);
+ item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
+
+ /* item_lsn of -1 means the item needs no further processing */
+ if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
+ continue;
+
+ /*
+ * if we are aborting the operation, no point in inserting the
+ * object into the AIL as we are in a shutdown situation.
+ */
+ if (aborted) {
+ ASSERT(XFS_FORCED_SHUTDOWN(ailp->ail_mount));
+ lip->li_ops->iop_unpin(lip, 1);
+ continue;
+ }
+
+ if (item_lsn != commit_lsn) {
+
+ /*
+ * Not a bulk update option due to unusual item_lsn.
+ * Push into AIL immediately, rechecking the lsn once
+ * we have the ail lock. Then unpin the item. This does
+ * not affect the AIL cursor the bulk insert path is
+ * using.
+ */
+ spin_lock(&ailp->ail_lock);
+ if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
+ xfs_trans_ail_update(ailp, lip, item_lsn);
+ else
+ spin_unlock(&ailp->ail_lock);
+ lip->li_ops->iop_unpin(lip, 0);
+ continue;
+ }
+
+ /* Item is a candidate for bulk AIL insert. */
+ log_items[i++] = lv->lv_item;
+ if (i >= LOG_ITEM_BATCH_SIZE) {
+ xfs_log_item_batch_insert(ailp, &cur, log_items,
+ LOG_ITEM_BATCH_SIZE, commit_lsn);
+ i = 0;
+ }
+ }
+
+ /* make sure we insert the remainder! */
+ if (i)
+ xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
+
+ spin_lock(&ailp->ail_lock);
+ xfs_trans_ail_cursor_done(&cur);
+ spin_unlock(&ailp->ail_lock);
+}
+
+/*
+ * Commit the given transaction to the log.
+ *
+ * XFS disk error handling mechanism is not based on a typical
+ * transaction abort mechanism. Logically after the filesystem
+ * gets marked 'SHUTDOWN', we can't let any new transactions
+ * be durable - ie. committed to disk - because some metadata might
+ * be inconsistent. In such cases, this returns an error, and the
+ * caller may assume that all locked objects joined to the transaction
+ * have already been unlocked as if the commit had succeeded.
+ * Do not reference the transaction structure after this call.
+ */
+static int
+__xfs_trans_commit(
+ struct xfs_trans *tp,
+ bool regrant)
+{
+ struct xfs_mount *mp = tp->t_mountp;
+ xfs_lsn_t commit_lsn = -1;
+ int error = 0;
+ int sync = tp->t_flags & XFS_TRANS_SYNC;
+
+ trace_xfs_trans_commit(tp, _RET_IP_);
+
+ /*
+ * Finish deferred items on final commit. Only permanent transactions
+ * should ever have deferred ops.
+ */
+ WARN_ON_ONCE(!list_empty(&tp->t_dfops) &&
+ !(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
+ if (!regrant && (tp->t_flags & XFS_TRANS_PERM_LOG_RES)) {
+ error = xfs_defer_finish_noroll(&tp);
+ if (error)
+ goto out_unreserve;
+ }
+
+ /*
+ * If there is nothing to be logged by the transaction,
+ * then unlock all of the items associated with the
+ * transaction and free the transaction structure.
+ * Also make sure to return any reserved blocks to
+ * the free pool.
+ */
+ if (!(tp->t_flags & XFS_TRANS_DIRTY))
+ goto out_unreserve;
+
+ if (XFS_FORCED_SHUTDOWN(mp)) {
+ error = -EIO;
+ goto out_unreserve;
+ }
+
+ ASSERT(tp->t_ticket != NULL);
+
+ /*
+ * If we need to update the superblock, then do it now.
+ */
+ if (tp->t_flags & XFS_TRANS_SB_DIRTY)
+ xfs_trans_apply_sb_deltas(tp);
+ xfs_trans_apply_dquot_deltas(tp);
+
+ xfs_log_commit_cil(mp, tp, &commit_lsn, regrant);
+
+ current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
+ xfs_trans_free(tp);
+
+ /*
+ * If the transaction needs to be synchronous, then force the
+ * log out now and wait for it.
+ */
+ if (sync) {
+ error = xfs_log_force_lsn(mp, commit_lsn, XFS_LOG_SYNC, NULL);
+ XFS_STATS_INC(mp, xs_trans_sync);
+ } else {
+ XFS_STATS_INC(mp, xs_trans_async);
+ }
+
+ return error;
+
+out_unreserve:
+ xfs_trans_unreserve_and_mod_sb(tp);
+
+ /*
+ * It is indeed possible for the transaction to be not dirty but
+ * the dqinfo portion to be. All that means is that we have some
+ * (non-persistent) quota reservations that need to be unreserved.
+ */
+ xfs_trans_unreserve_and_mod_dquots(tp);
+ if (tp->t_ticket) {
+ commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, regrant);
+ if (commit_lsn == -1 && !error)
+ error = -EIO;
+ tp->t_ticket = NULL;
+ }
+ current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
+ xfs_trans_free_items(tp, NULLCOMMITLSN, !!error);
+ xfs_trans_free(tp);
+
+ XFS_STATS_INC(mp, xs_trans_empty);
+ return error;
+}
+
+int
+xfs_trans_commit(
+ struct xfs_trans *tp)
+{
+ return __xfs_trans_commit(tp, false);
+}
+
+/*
+ * Unlock all of the transaction's items and free the transaction.
+ * The transaction must not have modified any of its items, because
+ * there is no way to restore them to their previous state.
+ *
+ * If the transaction has made a log reservation, make sure to release
+ * it as well.
+ */
+void
+xfs_trans_cancel(
+ struct xfs_trans *tp)
+{
+ struct xfs_mount *mp = tp->t_mountp;
+ bool dirty = (tp->t_flags & XFS_TRANS_DIRTY);
+
+ trace_xfs_trans_cancel(tp, _RET_IP_);
+
+ if (tp->t_flags & XFS_TRANS_PERM_LOG_RES)
+ xfs_defer_cancel(tp);
+
+ /*
+ * See if the caller is relying on us to shut down the
+ * filesystem. This happens in paths where we detect
+ * corruption and decide to give up.
+ */
+ if (dirty && !XFS_FORCED_SHUTDOWN(mp)) {
+ XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
+ xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
+ }
+#ifdef DEBUG
+ if (!dirty && !XFS_FORCED_SHUTDOWN(mp)) {
+ struct xfs_log_item *lip;
+
+ list_for_each_entry(lip, &tp->t_items, li_trans)
+ ASSERT(!(lip->li_type == XFS_LI_EFD));
+ }
+#endif
+ xfs_trans_unreserve_and_mod_sb(tp);
+ xfs_trans_unreserve_and_mod_dquots(tp);
+
+ if (tp->t_ticket) {
+ xfs_log_done(mp, tp->t_ticket, NULL, false);
+ tp->t_ticket = NULL;
+ }
+
+ /* mark this thread as no longer being in a transaction */
+ current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
+
+ xfs_trans_free_items(tp, NULLCOMMITLSN, dirty);
+ xfs_trans_free(tp);
+}
+
+/*
+ * Roll from one trans in the sequence of PERMANENT transactions to
+ * the next: permanent transactions are only flushed out when
+ * committed with xfs_trans_commit(), but we still want as soon
+ * as possible to let chunks of it go to the log. So we commit the
+ * chunk we've been working on and get a new transaction to continue.
+ */
+int
+xfs_trans_roll(
+ struct xfs_trans **tpp)
+{
+ struct xfs_trans *trans = *tpp;
+ struct xfs_trans_res tres;
+ int error;
+
+ trace_xfs_trans_roll(trans, _RET_IP_);
+
+ /*
+ * Copy the critical parameters from one trans to the next.
+ */
+ tres.tr_logres = trans->t_log_res;
+ tres.tr_logcount = trans->t_log_count;
+
+ *tpp = xfs_trans_dup(trans);
+
+ /*
+ * Commit the current transaction.
+ * If this commit failed, then it'd just unlock those items that
+ * are not marked ihold. That also means that a filesystem shutdown
+ * is in progress. The caller takes the responsibility to cancel
+ * the duplicate transaction that gets returned.
+ */
+ error = __xfs_trans_commit(trans, true);
+ if (error)
+ return error;
+
+ /*
+ * Reserve space in the log for the next transaction.
+ * This also pushes items in the "AIL", the list of logged items,
+ * out to disk if they are taking up space at the tail of the log
+ * that we want to use. This requires that either nothing be locked
+ * across this call, or that anything that is locked be logged in
+ * the prior and the next transactions.
+ */
+ tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
+ return xfs_trans_reserve(*tpp, &tres, 0, 0);
+}