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authorChristoph Hellwig <hch@infradead.org>2011-12-19 00:00:09 +0400
committerBen Myers <bpm@sgi.com>2012-01-18 01:06:45 +0400
commit474fce067521a40dbacc722e8ba119e81c2d31bf (patch)
treefd923aa42a5304182e8a8c64ca5d130f9afef286 /fs/xfs/xfs_inode.c
parent49e4c70e52a2bc2090e5a4e003e2888af21d6a2b (diff)
downloadlinux-474fce067521a40dbacc722e8ba119e81c2d31bf.tar.xz
xfs: replace i_flock with a sleeping bitlock
We almost never block on i_flock, the exception is synchronous inode flushing. Instead of bloating the inode with a 16/24-byte completion that we abuse as a semaphore just implement it as a bitlock that uses a bit waitqueue for the rare sleeping path. This primarily is a tradeoff between a much smaller inode and a faster non-blocking path vs faster wakeups, and we are much better off with the former. A small downside is that we will lose lockdep checking for i_flock, but given that it's always taken inside the ilock that should be acceptable. Note that for example the inode writeback locking is implemented in a very similar way. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Alex Elder <aelder@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_inode.c')
-rw-r--r--fs/xfs/xfs_inode.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 96b29e3286db..eeb60d31b086 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2396,7 +2396,7 @@ xfs_iflush(
XFS_STATS_INC(xs_iflush_count);
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
- ASSERT(!completion_done(&ip->i_flush));
+ ASSERT(xfs_isiflocked(ip));
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
@@ -2512,7 +2512,7 @@ xfs_iflush_int(
#endif
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
- ASSERT(!completion_done(&ip->i_flush));
+ ASSERT(xfs_isiflocked(ip));
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));