From: Nick Piggin <npiggin@suse.de>
To: Al Viro <viro@ZenIV.linux.org.uk>, stable@kernel.org
Cc: Stephen Hemminger <shemminger@vyatta.com>, linux-fsdevel@vger.kernel.org
Subject: [patch] fs: remove incorrect I_NEW warnings
Date: Tue, 2 Jun 2009 12:07:47 +0200 [thread overview]
Message-ID: <20090602100747.GA2900@wotan.suse.de> (raw)
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>
---
fs/fs-writeback.c | 2 --
1 file changed, 2 deletions(-)
Index: linux-2.6/fs/fs-writeback.c
===================================================================
--- linux-2.6.orig/fs/fs-writeback.c
+++ linux-2.6/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) &&
reply other threads:[~2009-06-02 10:07 UTC|newest]
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