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authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>2008-04-29 00:59:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:06 -0700
commit762873c251b056c6c1b29e83a4dabafb064e5421 (patch)
tree0b1f4f7c2e7ea46cf536fbdf227cb7734bc78b07
parent8f0cfa52a1d4ffacd8e7de906d19662f5da58d58 (diff)
downloadlinux-linaro-stable-762873c251b056c6c1b29e83a4dabafb064e5421.tar.gz
vfs: fix unconditional write_super() call in file_fsync()
We need to check ->s_dirt before calling write_super(). It became the cause of an unneeded write. This bug was noticed by Sudhanshu Saxena. Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/sync.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/sync.c b/fs/sync.c
index 7cd005ea7639..228e17b5e9ee 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -64,7 +64,7 @@ int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
/* sync the superblock to buffers */
sb = inode->i_sb;
lock_super(sb);
- if (sb->s_op->write_super)
+ if (sb->s_dirt && sb->s_op->write_super)
sb->s_op->write_super(sb);
unlock_super(sb);