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authorDavid Woodhouse <dwmw2@infradead.org>2007-07-23 10:20:10 +0100
committerDavid Woodhouse <dwmw2@infradead.org>2007-07-23 10:20:10 +0100
commit39fe5434cb9de5da40510028b17b96bc4eb312b3 (patch)
tree7a02a317b9ad57da51ca99887c119e779ccf3f13 /fs/xfs/xfs_trans.c
parent0fc72b81d3111d114ab378935b1cf07680ca1289 (diff)
parentf695baf2df9e0413d3521661070103711545207a (diff)
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'fs/xfs/xfs_trans.c')
-rw-r--r--fs/xfs/xfs_trans.c125
1 files changed, 81 insertions, 44 deletions
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index cc2d60951e2..356d6627f58 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -427,6 +427,14 @@ undo_blocks:
*
* 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(
@@ -434,13 +442,19 @@ xfs_trans_mod_sb(
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:
/*
@@ -453,6 +467,8 @@ xfs_trans_mod_sb(
ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
}
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:
/*
@@ -462,6 +478,8 @@ xfs_trans_mod_sb(
*/
ASSERT(delta < 0);
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:
/*
@@ -515,7 +533,7 @@ xfs_trans_mod_sb(
return;
}
- tp->t_flags |= (XFS_TRANS_SB_DIRTY | XFS_TRANS_DIRTY);
+ tp->t_flags |= flags;
}
/*
@@ -544,18 +562,23 @@ xfs_trans_apply_sb_deltas(
(tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
tp->t_ag_btree_delta));
- if (tp->t_icount_delta != 0) {
- INT_MOD(sbp->sb_icount, ARCH_CONVERT, tp->t_icount_delta);
- }
- if (tp->t_ifree_delta != 0) {
- INT_MOD(sbp->sb_ifree, ARCH_CONVERT, tp->t_ifree_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 != 0) {
+ INT_MOD(sbp->sb_icount, ARCH_CONVERT, tp->t_icount_delta);
+ }
+ if (tp->t_ifree_delta != 0) {
+ INT_MOD(sbp->sb_ifree, ARCH_CONVERT, tp->t_ifree_delta);
+ }
- if (tp->t_fdblocks_delta != 0) {
- INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_fdblocks_delta);
- }
- if (tp->t_res_fdblocks_delta != 0) {
- INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_res_fdblocks_delta);
+ if (tp->t_fdblocks_delta != 0) {
+ INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_fdblocks_delta);
+ }
+ if (tp->t_res_fdblocks_delta != 0) {
+ INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_res_fdblocks_delta);
+ }
}
if (tp->t_frextents_delta != 0) {
@@ -615,11 +638,23 @@ xfs_trans_apply_sb_deltas(
}
/*
- * xfs_trans_unreserve_and_mod_sb() is called to release unused
- * reservations and apply superblock counter changes to the in-core
- * superblock.
+ * 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.
*
* This is done efficiently with a single call to xfs_mod_incore_sb_batch().
+ * However, we have to ensure that we only modify each superblock field only
+ * once because the application of the delta values may not be atomic. That can
+ * lead to ENOSPC races occurring if we have two separate modifcations of the
+ * free space counter to put back the entire reservation and then take away
+ * what we used.
+ *
+ * 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.
*/
STATIC void
xfs_trans_unreserve_and_mod_sb(
@@ -627,40 +662,49 @@ xfs_trans_unreserve_and_mod_sb(
{
xfs_mod_sb_t msb[14]; /* If you add cases, add entries */
xfs_mod_sb_t *msbp;
+ xfs_mount_t *mp = tp->t_mountp;
/* REFERENCED */
int error;
int rsvd;
+ int64_t blkdelta = 0;
+ int64_t rtxdelta = 0;
msbp = msb;
rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
- /*
- * Release any reserved blocks. Any that were allocated
- * will be taken back again by fdblocks_delta below.
- */
- if (tp->t_blk_res > 0) {
+ /* calculate free blocks delta */
+ 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 (blkdelta != 0) {
msbp->msb_field = XFS_SBS_FDBLOCKS;
- msbp->msb_delta = tp->t_blk_res;
+ msbp->msb_delta = blkdelta;
msbp++;
}
- /*
- * Release any reserved real time extents . Any that were
- * allocated will be taken back again by frextents_delta below.
- */
- if (tp->t_rtx_res > 0) {
+ /* calculate free realtime extents 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 (rtxdelta != 0) {
msbp->msb_field = XFS_SBS_FREXTENTS;
- msbp->msb_delta = tp->t_rtx_res;
+ msbp->msb_delta = rtxdelta;
msbp++;
}
- /*
- * Apply any superblock modifications to the in-core version.
- * 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 (tp->t_flags & XFS_TRANS_SB_DIRTY) {
+ /* apply remaining deltas */
+
+ if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
+ (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
if (tp->t_icount_delta != 0) {
msbp->msb_field = XFS_SBS_ICOUNT;
msbp->msb_delta = tp->t_icount_delta;
@@ -671,16 +715,9 @@ xfs_trans_unreserve_and_mod_sb(
msbp->msb_delta = tp->t_ifree_delta;
msbp++;
}
- if (tp->t_fdblocks_delta != 0) {
- msbp->msb_field = XFS_SBS_FDBLOCKS;
- msbp->msb_delta = tp->t_fdblocks_delta;
- msbp++;
- }
- if (tp->t_frextents_delta != 0) {
- msbp->msb_field = XFS_SBS_FREXTENTS;
- msbp->msb_delta = tp->t_frextents_delta;
- msbp++;
- }
+ }
+
+ if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
if (tp->t_dblocks_delta != 0) {
msbp->msb_field = XFS_SBS_DBLOCKS;
msbp->msb_delta = tp->t_dblocks_delta;