[patch 002/108] fs: remove incorrect I_NEW warnings

Greg KH
2009-07-01T00:47:39Z

[-- Attachment #1: fs-remove-incorrect-i_new-warnings.patch --]
[-- Type: text/plain, Size: 1436 bytes --]

2.6.30-stable review patch. If anyone has any objections, please let us know.

------------------

From: Nick Piggin <npiggin@suse.de>

commit 545b9fd3d737afc0bb5203b1e79194a471605acd upstream.

Some filesystems can call in to sync an inode that is still in the
I_NEW state (eg. ext family, when mounted with -osync). This is OK
because the filesystem has sole access to the new inode, so it can
modify i_state without races (because no other thread should be
modifying it, by definition of I_NEW). Ie. a false positive, so
remove the warnings.

The races are described here 7ef0d7377cb287e08f3ae94cebc919448e1f5dff,
which is also where the warnings were introduced.

Reported-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
fs/fs-writeback.c | 2 --
1 file changed, 2 deletions(-)

--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -289,7 +289,6 @@ __sync_single_inode(struct inode *inode,
int ret;

BUG_ON(inode->i_state & I_SYNC);
- WARN_ON(inode->i_state & I_NEW);

/* Set I_SYNC, reset I_DIRTY */
dirty = inode->i_state & I_DIRTY;
@@ -314,7 +313,6 @@ __sync_single_inode(struct inode *inode,
}

spin_lock(&inode_lock);
- WARN_ON(inode->i_state & I_NEW);
inode->i_state &= ~I_SYNC;
if (!(inode->i_state & I_FREEING)) {
if (!(inode->i_state & I_DIRTY) &&