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authorChristoph Hellwig <hch@infradead.org>2012-04-23 15:58:33 +1000
committerBen Myers <bpm@sgi.com>2012-05-14 16:20:26 -0500
commit1c30462542bac8abffb4823638b6b1659c1cfcf5 (patch)
treeb86f1fc14eb0f41e224833128ecc81163227d044 /fs/xfs/xfs_trans_ail.c
parent32ce90a4b79155a155de2b284d8b69023e5e8fea (diff)
downloadlinux-1c30462542bac8abffb4823638b6b1659c1cfcf5.tar.gz
xfs: allow assigning the tail lsn with the AIL lock held
Provide a variant of xlog_assign_tail_lsn that has the AIL lock already held. By doing so we do an additional atomic_read + atomic_set under the lock, which comes down to two instructions. Switch xfs_trans_ail_update_bulk and xfs_trans_ail_delete_bulk to the new version to reduce the number of lock roundtrips, and prepare for a new addition that would require a third lock roundtrip in xfs_trans_ail_delete_bulk. This addition is also the reason for slightly rearranging the conditionals and relying on xfs_log_space_wake for checking that the filesystem has been shut down internally. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_trans_ail.c')
-rw-r--r--fs/xfs/xfs_trans_ail.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c
index 1dead07f092c..77acc53f2f31 100644
--- a/fs/xfs/xfs_trans_ail.c
+++ b/fs/xfs/xfs_trans_ail.c
@@ -79,7 +79,7 @@ xfs_ail_check(
* Return a pointer to the first item in the AIL. If the AIL is empty, then
* return NULL.
*/
-static xfs_log_item_t *
+xfs_log_item_t *
xfs_ail_min(
struct xfs_ail *ailp)
{
@@ -667,11 +667,15 @@ xfs_trans_ail_update_bulk(
if (!list_empty(&tmp))
xfs_ail_splice(ailp, cur, &tmp, lsn);
- spin_unlock(&ailp->xa_lock);
- if (mlip_changed && !XFS_FORCED_SHUTDOWN(ailp->xa_mount)) {
- xlog_assign_tail_lsn(ailp->xa_mount);
+ if (mlip_changed) {
+ if (!XFS_FORCED_SHUTDOWN(ailp->xa_mount))
+ xlog_assign_tail_lsn_locked(ailp->xa_mount);
+ spin_unlock(&ailp->xa_lock);
+
xfs_log_space_wake(ailp->xa_mount);
+ } else {
+ spin_unlock(&ailp->xa_lock);
}
}
@@ -729,11 +733,15 @@ xfs_trans_ail_delete_bulk(
if (mlip == lip)
mlip_changed = 1;
}
- spin_unlock(&ailp->xa_lock);
- if (mlip_changed && !XFS_FORCED_SHUTDOWN(ailp->xa_mount)) {
- xlog_assign_tail_lsn(ailp->xa_mount);
+ if (mlip_changed) {
+ if (!XFS_FORCED_SHUTDOWN(ailp->xa_mount))
+ xlog_assign_tail_lsn_locked(ailp->xa_mount);
+ spin_unlock(&ailp->xa_lock);
+
xfs_log_space_wake(ailp->xa_mount);
+ } else {
+ spin_unlock(&ailp->xa_lock);
}
}