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authorJan Kara <jack@suse.cz>2012-12-05 17:40:14 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-12-20 22:57:36 +0400
commit72651cac884b1e285fa8e8314b10e9f1b8458802 (patch)
tree8872407cd5c36f52054c18f11b7b8470dccb1d6e /fs/file_table.c
parent39e3c9553f34381a1b664c27b0c696a266a5735e (diff)
downloadlinux-72651cac884b1e285fa8e8314b10e9f1b8458802.tar.xz
fs: Fix imbalance in freeze protection in mark_files_ro()
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 <zkabelac@redhat.com> CC: stable@vger.kernel.org Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/file_table.c')
-rw-r--r--fs/file_table.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/file_table.c b/fs/file_table.c
index a72bf9ddd0d2..de9e9653d611 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -458,8 +458,8 @@ void mark_files_ro(struct super_block *sb)
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);
}