Miklos Szeredi 8110e16d42 vfs: dcache: fix deadlock in tree traversal ... IBM reported a deadlock in select_parent(). This was found to be caused by taking rename_lock when already locked when restarting the tree traversal. There are two cases when the traversal needs to be restarted: 1) concurrent d_move(); this can only happen when not already locked, since taking rename_lock protects against concurrent d_move(). 2) racing with final d_put() on child just at the moment of ascending to parent; rename_lock doesn't protect against this rare race, so it can happen when already locked. Because of case 2, we need to be able to handle restarting the traversal when rename_lock is already held. This patch fixes all three callers of try_to_ascend(). IBM reported that the deadlock is gone with this patch. [ I rewrote the patch to be smaller and just do the "goto again" if the lock was already held, but credit goes to Miklos for the real work. - Linus ] Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-09-29 17:41:40 -07:00
..
9p	9p: Push file_update_time() into v9fs_vm_page_mkwrite()	2012-07-31 01:02:46 +04:00
adfs
affs	affs: use memweight()	2012-07-30 17:25:16 -07:00
afs
autofs4	autofs4 - fix expire check	2012-08-17 06:56:39 -07:00
befs
bfs
btrfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2012-09-16 12:58:44 -07:00
cachefiles	fs: cachefiles: add support for large files in filesystem caching	2012-07-30 17:25:21 -07:00
ceph	ceph: avoid divide by zero in __validate_layout()	2012-08-21 15:55:28 -07:00
cifs	cifs: fix return value in cifsConvertToUTF16	2012-09-18 15:35:25 -05:00
coda
configfs
cramfs
debugfs	debugfs: fix u32_array race in format_array_alloc	2012-09-21 11:48:05 -07:00
devpts
dlm
ecryptfs	eCryptfs: Copy up attributes of the lower target inode after rename	2012-09-14 09:36:03 -07:00
efs
exofs	Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd	2012-08-03 13:24:07 -07:00
exportfs	switch dentry_open() to struct path, make it grab references itself	2012-07-23 00:01:29 +04:00
ext2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-08-01 10:26:23 -07:00
ext3	ext3: Fix fdatasync() for files with only i_size changes	2012-09-04 00:04:43 +02:00
ext4	The following are all bug fixes and regressions. The most notable are	2012-08-17 08:04:47 -07:00
fat	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-08-01 10:26:23 -07:00
freevxfs
fscache
fuse	fuse: fix retrieve length	2012-09-04 18:45:54 +02:00
gfs2	Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes	2012-09-14 18:05:14 -07:00
hfs	hfs: nuke write_super from comments	2012-08-04 12:15:38 +04:00
hfsplus	hfsplus: use -ENOMEM when kzalloc() fails	2012-07-30 17:25:19 -07:00
hostfs
hpfs
hppfs	switch dentry_open() to struct path, make it grab references itself	2012-07-23 00:01:29 +04:00
hugetlbfs	hugetlb: use mmu_gather instead of a temporary linked list for accumulating pages	2012-07-31 18:42:40 -07:00
isofs	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs	2012-07-24 17:40:44 -07:00
jbd	jbd: don't write superblock when unmounting an ro filesystem	2012-08-15 13:53:30 +02:00
jbd2	The following are all bug fixes and regressions. The most notable are	2012-08-17 08:04:47 -07:00
jffs2	don't expose I_NEW inodes via dentry->d_inode	2012-07-23 00:00:58 +04:00
jfs	don't expose I_NEW inodes via dentry->d_inode	2012-07-23 00:00:58 +04:00
lockd	close the race in nlmsvc_free_block()	2012-09-22 20:48:20 -04:00
logfs	Pull request from git://github.com/prasad-joshi/logfs_upstream.git	2012-08-26 10:14:11 -07:00
minix	minixfs: fix block limit check	2012-07-30 17:25:19 -07:00
ncpfs
nfs	NFS: fsync() must exit with an error if page writeback failed	2012-09-11 15:38:32 -04:00
nfs_common
nfsd	nfsd4: fix security flavor of NFSv4.0 callback	2012-08-20 18:38:36 -04:00
nilfs2	nilfs2: nuke write_super from comments	2012-08-04 12:15:38 +04:00
nls
notify	switch dentry_open() to struct path, make it grab references itself	2012-07-23 00:01:29 +04:00
ntfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-08-01 10:26:23 -07:00
ocfs2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-08-01 10:26:23 -07:00
omfs
openpromfs
proc	fs/proc: fix potential unregister_sysctl_table hang	2012-09-17 10:32:03 -07:00
pstore
qnx4	qnx4fs: use memweight()	2012-07-30 17:25:16 -07:00
qnx6
quota	quota: Move down dqptr_sem read after initializing default warn[] type at __dquot_alloc_space().	2012-08-15 00:22:57 +02:00
ramfs
reiserfs	reiserfs: fix deadlocks with quotas	2012-08-15 00:22:57 +02:00
romfs
squashfs
sysfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-08-01 10:26:23 -07:00
sysv	fs/sysv: stop using write_super and s_dirt	2012-07-22 23:58:12 +04:00
ubifs	UBIFS: fix error messages spelling	2012-08-22 17:41:09 +03:00
udf	udf: Fix data corruption for files in ICB	2012-09-05 16:06:03 +02:00
ufs	fs/ufs: get rid of write_super	2012-07-22 23:58:16 +04:00
xfs	xfs: stop the sync worker before xfs_unmountfs	2012-09-18 16:51:26 -05:00
aio.c	aio: now fput() is OK from interrupt context; get rid of manual delayed __fput()	2012-07-22 23:57:59 +04:00
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c
binfmt_elf.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c
bio.c	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2012-08-25 11:36:43 -07:00
block_dev.c	fs/block-dev.c:fix performance regression in O_DIRECT writes to md block devices	2012-08-02 09:50:39 +02:00
buffer.c	block: replace __getblk_slow misfix by grow_dev_page fix	2012-08-23 12:17:36 +02:00
char_dev.c
compat_binfmt_elf.c
compat_ioctl.c
compat.c	vfs: missed source of ->f_pos races	2012-08-20 10:11:47 -07:00
dcache.c	vfs: dcache: fix deadlock in tree traversal	2012-09-29 17:41:40 -07:00
dcookies.c
direct-io.c	block: move down direct IO plugging	2012-08-09 15:23:09 +02:00
drop_caches.c
eventfd.c
eventpoll.c	eventpoll: use-after-possible-free in epoll_create1()	2012-08-22 10:26:55 -04:00
exec.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-08-01 10:26:23 -07:00
fcntl.c	c/r: fcntl: add F_GETOWNER_UIDS option	2012-07-30 17:25:21 -07:00
fhandle.c
fifo.c
file_table.c	fs: Add freezing handling to mnt_want_write() / mnt_drop_write()	2012-07-31 09:40:38 +04:00
file.c
filesystems.c
fs_struct.c
fs-writeback.c	mm: prepare for removal of obsolete /proc/sys/vm/nr_pdflush_threads	2012-07-31 18:42:40 -07:00
generic_acl.c
inode.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-08-01 10:26:23 -07:00
internal.h	fs: Add freezing handling to mnt_want_write() / mnt_drop_write()	2012-07-31 09:40:38 +04:00
ioctl.c
ioprio.c
Kconfig
Kconfig.binfmt
libfs.c
locks.c	locks: remove unused lm_release_private	2012-08-01 09:01:46 -07:00
Makefile
mbcache.c
mount.h
mpage.c
namei.c	fs: fix fs/namei.c kernel-doc warnings	2012-08-22 10:30:10 -04:00
namespace.c	do_add_mount()/umount -l races	2012-09-22 20:48:18 -04:00
no-block.c
open.c	vfs: canonicalize create mode in build_open_flags()	2012-08-15 13:01:24 +02:00
pipe.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-08-01 10:26:23 -07:00
pnode.c
pnode.h
posix_acl.c
proc_namespace.c
read_write.c	vfs: allow custom EOF in generic_file_llseek code	2012-07-23 00:00:15 +04:00
read_write.h
readdir.c
select.c	posix_types.h: Cleanup stale __NFDBITS and related definitions	2012-07-26 13:36:43 -07:00
seq_file.c
signalfd.c
splice.c	fs: Protect write paths by sb_start_write - sb_end_write	2012-07-31 09:45:47 +04:00
stack.c
stat.c	vfs: make O_PATH file descriptors usable for 'fstat()'	2012-09-14 14:48:21 -07:00
statfs.c
super.c	vfs: kill write_super and sync_supers	2012-08-04 01:24:44 +04:00
sync.c	vfs: Avoid unnecessary WB_SYNC_NONE writeback during sys_sync and reorder sync passes	2012-07-22 23:59:01 +04:00
timerfd.c
utimes.c
xattr_acl.c
xattr.c	fs/xattr.c:getxattr(): improve handling of allocation failures	2012-07-30 17:25:11 -07:00