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authorRichard Kennedy <richard@rsk.demon.co.uk>2010-05-24 14:32:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-25 08:07:00 -0700
commit58a9d3d8db06ca2ec31f64ec49ab0aeb89971b85 (patch)
tree70c695b6473d4d25b32a2946e053742f6c49755e
parentec95f53aa6ed62ba68660cb19c8474ebe9025cce (diff)
downloadop-kernel-dev-58a9d3d8db06ca2ec31f64ec49ab0aeb89971b85.zip
op-kernel-dev-58a9d3d8db06ca2ec31f64ec49ab0aeb89971b85.tar.gz
fs-writeback: check sync bit earlier in inode_wait_for_writeback
When wb_writeback() hasn't written anything it will re-acquire the inode lock before calling inode_wait_for_writeback. This change tests the sync bit first so that is doesn't need to drop & re-acquire the lock if the inode became available while wb_writeback() was waiting to get the lock. Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/fs-writeback.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 5c4161f..ea8592b 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -409,11 +409,11 @@ static void inode_wait_for_writeback(struct inode *inode)
wait_queue_head_t *wqh;
wqh = bit_waitqueue(&inode->i_state, __I_SYNC);
- do {
+ while (inode->i_state & I_SYNC) {
spin_unlock(&inode_lock);
__wait_on_bit(wqh, &wq, inode_wait, TASK_UNINTERRUPTIBLE);
spin_lock(&inode_lock);
- } while (inode->i_state & I_SYNC);
+ }
}
/*
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