Forbid user to change file flags on quota files
authorJan Kara <jack@suse.cz>
Thu, 15 Nov 2007 00:58:56 +0000 (16:58 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Thu, 15 Nov 2007 02:45:38 +0000 (18:45 -0800)
commite47776a0a41a14a5634633c96e590827f552c4b5
tree44d5168b83fb1d8d72668728c690116d34f6711f
parent28822f22e18fc3c422f64b5bf0bb1e6c306af634
Forbid user to change file flags on quota files

Forbid user from changing file flags on quota files.  User has no bussiness
in playing with these flags when quota is on.  Furthermore there is a
remote possibility of deadlock due to a lock inversion between quota file's
i_mutex and transaction's start (i_mutex for quota file is locked only when
trasaction is started in quota operations) in ext3 and ext4.

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: LIOU Payphone <lioupayphone@gmail.com>
Cc: <linux-ext4@vger.kernel.org>
Acked-by: Dave Kleikamp <shaggy@austin.ibm.com>
Cc: <reiserfs-dev@namesys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/ext2/ioctl.c
fs/ext3/ioctl.c
fs/ext4/ioctl.c
fs/jfs/ioctl.c
fs/reiserfs/ioctl.c