linux-hardened/fs/quota
Jan Kara f00c9e44ad quota: Fix deadlock during path resolution
As Al Viro pointed out path resolution during Q_QUOTAON calls to quotactl
is prone to deadlocks. We hold s_umount semaphore for reading during the
path resolution and resolution itself may need to acquire the semaphore
for writing when e. g. autofs mountpoint is passed.

Solve the problem by performing the resolution before we get hold of the
superblock (and thus s_umount semaphore). The whole thing is complicated
by the fact that some filesystems (OCFS2) ignore the path argument. So to
distinguish between filesystem which want the path and which do not we
introduce new .quota_on_meta callback which does not get the path. OCFS2
then uses this callback instead of old .quota_on.

CC: Al Viro <viro@ZenIV.linux.org.uk>
CC: Christoph Hellwig <hch@lst.de>
CC: Ted Ts'o <tytso@mit.edu>
CC: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Jan Kara <jack@suse.cz>
2011-01-12 19:14:55 +01:00
..
compat.c quota: split out compat_sys_quotactl support from quota.c 2010-03-05 00:20:25 +01:00
dquot.c quota: Fix deadlock during path resolution 2011-01-12 19:14:55 +01:00
Kconfig quota: Make QUOTACTL config be selected by its users 2010-10-05 12:16:37 +02:00
Makefile quota: split out compat_sys_quotactl support from quota.c 2010-03-05 00:20:25 +01:00
netlink.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
quota.c quota: Fix deadlock during path resolution 2011-01-12 19:14:55 +01:00
quota_tree.c quota: Use %pV and __attribute__((format (printf in __quota_error and fix fallout 2011-01-10 19:04:05 +01:00
quota_tree.h quota: Change quota error message to print out disk and function name 2010-07-21 16:05:58 +02:00
quota_v1.c quota: Change quota error message to print out disk and function name 2010-07-21 16:05:58 +02:00
quota_v2.c quota: Change quota error message to print out disk and function name 2010-07-21 16:05:58 +02:00
quotaio_v1.h quota: Move quota files into separate directory 2009-03-26 02:18:35 +01:00
quotaio_v2.h quota: Implement quota format with 64-bit space and inode limits 2009-12-10 15:02:54 +01:00