Tejun Heo 49731baa41 block: restore multiple bd_link_disk_holder() support ... Commit e09b457b (block: simplify holder symlink handling) incorrectly assumed that there is only one link at maximum. dm may use multiple links and expects block layer to track reference count for each link, which is different from and unrelated to the exclusive device holder identified by @holder when the device is opened. Remove the single holder assumption and automatic removal of the link and revive the per-link reference count tracking. The code essentially behaves the same as before commit e09b457b sans the unnecessary kobject reference count dancing. While at it, note that this facility should not be used by anyone else than the current ones. Sysfs symlinks shouldn't be abused like this and the whole thing doesn't belong in the block layer at all. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Milan Broz <mbroz@redhat.com> Cc: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Cc: Neil Brown <neilb@suse.de> Cc: linux-raid@vger.kernel.org Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>		2011-01-14 18:44:22 +01:00
..
9p	switch 9p	2011-01-12 20:03:43 -05:00
adfs	switch adfs	2011-01-12 20:02:45 -05:00
affs	switch affs	2011-01-12 20:03:42 -05:00
afs	switch afs	2011-01-12 20:04:20 -05:00
autofs4	fs: rcu-walk aware d_revalidate method	2011-01-07 17:50:29 +11:00
befs	befs: don't pass huge structs by value	2011-01-13 08:03:15 -08:00
bfs	fs: icache RCU free inodes	2011-01-07 17:50:26 +11:00
btrfs	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
cachefiles	llseek: automatically add .llseek fop	2010-10-15 15:53:27 +02:00
ceph	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client	2011-01-13 10:25:24 -08:00
cifs	switch cifs	2011-01-12 20:02:46 -05:00
coda	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6	2011-01-13 10:27:28 -08:00
configfs	switch configfs	2011-01-12 20:03:12 -05:00
cramfs	cramfs: generate unique inode number for better inode cache usage	2011-01-13 08:03:23 -08:00
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	ecryptfs: fix broken build	2011-01-13 17:19:38 -08:00
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	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
ext4	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
fat	switch fat to ->s_d_op, close exportfs races there	2011-01-12 20:02:43 -05:00
freevxfs	fs: icache RCU free inodes	2011-01-07 17:50:26 +11:00
fscache
fuse	switch fuse	2011-01-12 20:02:44 -05:00
gfs2	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
hfs	switch hfs	2011-01-12 20:02:45 -05:00
hfsplus	switch hfsplus	2011-01-12 20:02:45 -05:00
hostfs	switch hostfs	2011-01-12 20:03:42 -05:00
hpfs	switch hpfs	2011-01-12 20:02:47 -05:00
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	fix isofs d_op handling	2011-01-12 20:02:43 -05:00
jbd	fix comment typos concerning "consistent"	2010-12-10 16:04:28 +01:00
jbd2	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2011-01-13 10:05:56 -08:00
jffs2	fs: provide rcu-walk aware permission i_ops	2011-01-07 17:50:29 +11:00
jfs	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
lockd	lockd: double unlock in next_host_state()	2011-01-04 13:10:37 -05:00
logfs	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
minix	minixfs: kill dead code	2011-01-12 20:02:44 -05:00
ncpfs	move internal-only parts of ncpfs headers to fs/ncpfs	2011-01-12 20:03:43 -05:00
nfs	Merge branch 'vfs-scale-working' of git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin	2011-01-13 20:14:13 -08:00
nfs_common
nfsd	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
nilfs2	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
nls
notify	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2011-01-13 10:05:56 -08:00
ntfs	NTFS: writev() fix and maintenance/contact details update	2011-01-12 08:35:53 -08:00
ocfs2	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
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-2.6.38/event-handling' into for-2.6.38/core	2011-01-13 14:47:54 +01:00
proc	thp: remove PG_buddy	2011-01-13 17:32:43 -08:00
qnx4	fs: icache RCU free inodes	2011-01-07 17:50:26 +11:00
quota	quota: Use %pV and __attribute__((format (printf in __quota_error and fix fallout	2011-01-10 19:04:05 +01:00
ramfs	convert get_sb_nodev() users	2010-10-29 04:16:31 -04:00
reiserfs	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
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	switch sysv	2011-01-12 20:02:44 -05:00
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 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
aio.c	aio: remove unused aio_run_iocbs()	2011-01-13 08:03:22 -08:00
anon_inodes.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6	2011-01-13 10:27:28 -08:00
attr.c
bad_inode.c	fs: provide rcu-walk aware permission i_ops	2011-01-07 17:50:29 +11:00
binfmt_aout.c	Don't dump task struct in a.out core-dumps	2010-10-14 10:57:40 -07:00
binfmt_elf.c	binfmt_elf: cleanups	2011-01-13 08:03:12 -08:00
binfmt_elf_fdpic.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-integrity: mark kintegrityd_wq highpri and CPU intensive	2011-01-03 15:01:48 +01:00
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	block: restore multiple bd_link_disk_holder() support	2011-01-14 18:44:22 +01:00
buffer.c	fs: Use this_cpu_inc_return in buffer.c	2010-12-17 15:18:05 +01:00
char_dev.c	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
compat.c	exec: copy-and-paste the fixes into compat_do_execve() paths	2010-11-30 17:56:38 -08:00
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
dcache.c	fs: fix kernel-doc for dcache::prepend_path	2011-01-12 20:06:57 -05:00
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	llseek: automatically add .llseek fop	2010-10-15 15:53:27 +02:00
eventpoll.c	epoll: convert max_user_watches to long	2011-01-13 08:03:12 -08:00
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	llseek: automatically add .llseek fop	2010-10-15 15:53:27 +02:00
file.c
file_table.c	fs: allow for more than 2^31 files	2010-10-26 16:52:15 -07:00
filesystems.c	fs: rcu-walk for path lookup	2011-01-07 17:50:27 +11:00
fs-writeback.c	fs/fs-writeback.c: fix sync_inodes_sb() return value kernel-doc	2011-01-13 17:32:48 -08:00
fs_struct.c	fs: scale mntget/mntput	2011-01-07 17:50:33 +11:00
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	pass default dentry_operations to mount_pseudo()	2011-01-12 20:03:43 -05:00
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	fs/mpage.c: consolidate code	2011-01-13 17:32:32 -08:00
namei.c	Merge branch 'vfs-scale-working' of git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin	2011-01-13 20:14:13 -08:00
namespace.c	fs: scale mntget/mntput	2011-01-07 17:50:33 +11:00
nfsctl.c
no-block.c	llseek: automatically add .llseek fop	2010-10-15 15:53:27 +02:00
open.c	fs: add hole punching to fallocate	2011-01-12 20:16:43 -05:00
pipe.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6	2011-01-13 10:27:28 -08:00
pnode.c	fs: scale mntget/mntput	2011-01-07 17:50:33 +11:00
pnode.h
posix_acl.c
read_write.c	fix signedness mess in rw_verify_area() on 64bit architectures	2011-01-12 20:06:58 -05:00
read_write.h
readdir.c
select.c	fs/select.c: fix information leak to userspace	2011-01-13 08:03:12 -08:00
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	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
stack.c
stat.c
statfs.c
super.c	Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block	2011-01-13 10:45:01 -08:00
sync.c
timerfd.c	llseek: automatically add .llseek fop	2010-10-15 15:53:27 +02:00
utimes.c
xattr.c
xattr_acl.c