From 84f3c683c4d3f36d3c3ed320babd960a332ac458 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Fri, 3 Dec 2010 22:11:29 +1100 Subject: xfs: convert l_last_sync_lsn to an atomic variable log->l_last_sync_lsn is updated in only one critical spot - log buffer Io completion - and is protected by the grant lock here. This requires the grant lock to be taken for every log buffer IO completion. Converting the l_last_sync_lsn variable to an atomic64_t means that we do not need to take the grant lock in log buffer IO completion to update it. This also removes the need for explicitly holding a spinlock to read the l_last_sync_lsn on 32 bit platforms. Signed-off-by: Dave Chinner Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_log_recover.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'fs/xfs/xfs_log_recover.c') diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c index 1550404a8aeb..18e1e18d7147 100644 --- a/fs/xfs/xfs_log_recover.c +++ b/fs/xfs/xfs_log_recover.c @@ -937,7 +937,7 @@ xlog_find_tail( if (found == 2) log->l_curr_cycle++; log->l_tail_lsn = be64_to_cpu(rhead->h_tail_lsn); - log->l_last_sync_lsn = be64_to_cpu(rhead->h_lsn); + atomic64_set(&log->l_last_sync_lsn, be64_to_cpu(rhead->h_lsn)); xlog_assign_grant_head(&log->l_grant_reserve_head, log->l_curr_cycle, BBTOB(log->l_curr_block)); xlog_assign_grant_head(&log->l_grant_write_head, log->l_curr_cycle, @@ -989,9 +989,9 @@ xlog_find_tail( log->l_tail_lsn = xlog_assign_lsn(log->l_curr_cycle, after_umount_blk); - log->l_last_sync_lsn = + atomic64_set(&log->l_last_sync_lsn, xlog_assign_lsn(log->l_curr_cycle, - after_umount_blk); + after_umount_blk)); *tail_blk = after_umount_blk; /* -- cgit v1.2.2