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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_log.h
parent32ce90a4b79155a155de2b284d8b69023e5e8fea (diff)
downloadlinux-1c30462542bac8abffb4823638b6b1659c1cfcf5.tar.bz2
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_log.h')
-rw-r--r--fs/xfs/xfs_log.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h
index 2c622bedb302..748d312850e2 100644
--- a/fs/xfs/xfs_log.h
+++ b/fs/xfs/xfs_log.h
@@ -152,6 +152,7 @@ int xfs_log_mount(struct xfs_mount *mp,
int num_bblocks);
int xfs_log_mount_finish(struct xfs_mount *mp);
xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
+xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
void xfs_log_space_wake(struct xfs_mount *mp);
int xfs_log_notify(struct xfs_mount *mp,
struct xlog_in_core *iclog,