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f00c9e44ad
linux/fs
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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
..
9p fs/9p: Don't set dentry->d_op in create routines 2011-01-11 09:58:08 -06:00
adfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
affs fs: dcache per-inode inode alias locking 2011-01-07 17:50:31 +11:00
afs fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
autofs4 fs: rcu-walk aware d_revalidate method 2011-01-07 17:50:29 +11:00
befs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
bfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
btrfs btrfs: provide simple rcu-walk ACL implementation 2011-01-07 17:50:30 +11:00
cachefiles
ceph fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
cifs cifs: use CreationTime like an i_generation field 2011-01-09 23:43:00 +00:00
coda fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
configfs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
cramfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
debugfs convert get_sb_single() users 2010-10-29 04:16:28 -04:00
devpts convert get_sb_single() users 2010-10-29 04:16:28 -04:00
dlm dlm: sanitize work_start() in lowcomms.c 2010-12-13 13:42:24 -06:00
ecryptfs fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
efs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
exofs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
exportfs fs: dcache per-inode inode alias locking 2011-01-07 17:50:31 +11:00
ext2 Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 2011-01-11 14:37:31 -08:00
ext3 quota: Fix deadlock during path resolution 2011-01-12 19:14:55 +01:00
ext4 quota: Fix deadlock during path resolution 2011-01-12 19:14:55 +01:00
fat fs: rcu-walk aware d_revalidate method 2011-01-07 17:50:29 +11:00
freevxfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
fscache
fuse Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 2011-01-10 07:43:54 -08:00
gfs2 headers: kobject.h redux 2011-01-10 08:51:44 -08:00
hfs fs: rcu-walk aware d_revalidate method 2011-01-07 17:50:29 +11:00
hfsplus Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/hch/hfsplus 2011-01-07 17:16:27 -08:00
hostfs fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
hpfs fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
hppfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
hugetlbfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
isofs fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
jbd Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-10-27 20:13:18 -07:00
jbd2 ext4: dynamically allocate the jbd2_inode in ext4_inode_info as necessary 2011-01-10 12:29:43 -05:00
jffs2 fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
jfs fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
lockd lockd: double unlock in next_host_state() 2011-01-04 13:10:37 -05:00
logfs fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
minix fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
ncpfs Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq 2011-01-07 16:58:04 -08:00
nfs Merge branch 'nfs-for-2.6.38' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6 2011-01-11 15:11:56 -08:00
nfs_common
nfsd Merge branch 'nfs-for-2.6.38' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6 2011-01-11 15:11:56 -08:00
nilfs2 headers: kobject.h redux 2011-01-10 08:51:44 -08:00
nls
notify fs: dcache per-inode inode alias locking 2011-01-07 17:50:31 +11:00
ntfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
ocfs2 quota: Fix deadlock during path resolution 2011-01-12 19:14:55 +01:00
omfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
openpromfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
partitions Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2010-10-25 07:45:10 -07:00
proc Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6 2011-01-07 14:39:20 -08:00
qnx4 fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
quota quota: Fix deadlock during path resolution 2011-01-12 19:14:55 +01:00
ramfs convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
reiserfs quota: Fix deadlock during path resolution 2011-01-12 19:14:55 +01:00
romfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
squashfs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
sysfs Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2011-01-10 16:10:33 -08:00
sysv fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
ubifs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
udf Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-udf-2.6 2011-01-11 14:45:52 -08:00
ufs fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
xfs Merge branch 'master' into for-linus-merged 2011-01-10 21:35:55 -06:00
aio.c new helper: ihold() 2010-10-25 21:26:11 -04:00
anon_inodes.c fs: scale mntget/mntput 2011-01-07 17:50:33 +11:00
attr.c
bad_inode.c fs: provide rcu-walk aware permission i_ops 2011-01-07 17:50:29 +11:00
binfmt_aout.c
binfmt_elf_fdpic.c
binfmt_elf.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c convert get_sb_single() users 2010-10-29 04:16:28 -04:00
binfmt_script.c
binfmt_som.c
bio-integrity.c
bio.c bio: take care not overflow page count when mapping/copying user data 2010-11-10 14:40:43 +01:00
block_dev.c fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
buffer.c fs: Use this_cpu_inc_return in buffer.c 2010-12-17 15:18:05 +01:00
char_dev.c
compat_binfmt_elf.c
compat_ioctl.c Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6 2011-01-07 14:39:20 -08:00
compat.c exec: copy-and-paste the fixes into compat_do_execve() paths 2010-11-30 17:56:38 -08:00
dcache.c fs: implement faster dentry memcmp 2011-01-07 17:50:32 +11:00
dcookies.c
direct-io.c fs/direct-io.c: fix truncation error in dio_complete() return 2010-10-26 16:52:13 -07:00
drop_caches.c
eventfd.c
eventpoll.c epoll: make epoll_wait() use the hrtimer range feature 2010-10-27 18:03:18 -07:00
exec.c install_special_mapping skips security_file_mmap check. 2010-12-15 12:30:36 -08:00
fcntl.c fasync: Fix placement of FASYNC flag comment 2010-10-27 18:17:02 -07:00
fifo.c
file_table.c fs: allow for more than 2^31 files 2010-10-26 16:52:15 -07:00
file.c
filesystems.c fs: rcu-walk for path lookup 2011-01-07 17:50:27 +11:00
fs_struct.c fs: scale mntget/mntput 2011-01-07 17:50:33 +11:00
fs-writeback.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable 2010-10-30 09:05:48 -07:00
generic_acl.c fs: provide simple rcu-walk generic_check_acl implementation 2011-01-07 17:50:29 +11:00
inode.c fs: avoid inode RCU freeing for pseudo fs 2011-01-07 17:50:26 +11:00
internal.h fs: scale mntget/mntput 2011-01-07 17:50:33 +11:00
ioctl.c Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 2010-11-19 19:46:45 -08:00
ioprio.c ioprio: grab rcu_read_lock in sys_ioprio_{set,get}() 2010-11-15 10:23:31 +01:00
Kconfig Merge 'staging-next' to Linus's tree 2010-10-28 09:44:56 -07:00
Kconfig.binfmt coredump: default CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y 2010-10-27 18:03:12 -07:00
libfs.c fs: dcache reduce branches in lookup path 2011-01-07 17:50:28 +11:00
locks.c fs: dcache scale dentry refcount 2011-01-07 17:50:21 +11:00
Makefile Merge 'staging-next' to Linus's tree 2010-10-28 09:44:56 -07:00
mbcache.c ext2: Resolve 'dereferencing pointer to incomplete type' when enabling EXT2_XATTR_DEBUG 2011-01-10 19:04:08 +01:00
mpage.c
namei.c fs: fix namei.c kernel-doc notation 2011-01-10 07:38:53 -08:00
namespace.c fs: scale mntget/mntput 2011-01-07 17:50:33 +11:00
nfsctl.c
no-block.c
open.c fix open/umount race 2010-10-29 04:14:56 -04:00
pipe.c fs: scale mntget/mntput 2011-01-07 17:50:33 +11:00
pnode.c fs: scale mntget/mntput 2011-01-07 17:50:33 +11:00
pnode.h
posix_acl.c
read_write.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
read_write.h
readdir.c
select.c epoll: make epoll_wait() use the hrtimer range feature 2010-10-27 18:03:18 -07:00
seq_file.c fs: take dcache_lock inside __d_path 2010-10-25 21:26:12 -04:00
signalfd.c Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6 2010-10-26 10:13:10 -07:00
splice.c Export 'get_pipe_info()' to other users 2010-11-28 14:09:57 -08:00
stack.c
stat.c
statfs.c
super.c fs: scale mntget/mntput 2011-01-07 17:50:33 +11:00
sync.c
timerfd.c
utimes.c
xattr_acl.c
xattr.c