This is a note to let you know that I've just added the patch titled
fs: Fix imbalance in freeze protection in mark_files_ro()
to the 3.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fs-fix-imbalance-in-freeze-protection-in-mark_files_ro.patch
and it can be found in the queue-3.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 72651cac884b1e285fa8e8314b10e9f1b8458802 Mon Sep 17 00:00:00 2001
From: Jan Kara <[email protected]>
Date: Wed, 5 Dec 2012 14:40:14 +0100
Subject: fs: Fix imbalance in freeze protection in mark_files_ro()
From: Jan Kara <[email protected]>
commit 72651cac884b1e285fa8e8314b10e9f1b8458802 upstream.
File descriptors (even those for writing) do not hold freeze protection.
Thus mark_files_ro() must call __mnt_drop_write() to only drop protection
against remount read-only. Calling mnt_drop_write_file() as we do now
results in:
[ BUG: bad unlock balance detected! ]
3.7.0-rc6-00028-g88e75b6 #101 Not tainted
-------------------------------------
kworker/1:2/79 is trying to release lock (sb_writers) at:
[<ffffffff811b33b4>] mnt_drop_write+0x24/0x30
but there are no more locks to release!
Reported-by: Zdenek Kabelac <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Al Viro <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/file_table.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -458,8 +458,8 @@ void mark_files_ro(struct super_block *s
spin_unlock(&f->f_lock);
if (file_check_writeable(f) != 0)
continue;
+ __mnt_drop_write(f->f_path.mnt);
file_release_write(f);
- mnt_drop_write_file(f);
} while_file_list_for_each_entry;
lg_global_unlock(&files_lglock);
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.7/fs-fix-imbalance-in-freeze-protection-in-mark_files_ro.patch
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