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alistair23-linux/fs
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Krzysztof Opasiak d79d75b5c5 fs: configfs: Add unlocked version of configfs_depend_item() 
This change is necessary for the SCSI target usb gadget composed with
configfs. In this case configfs will be used for two different purposes:
to compose a usb gadget and to configure the target part. If an instance
of tcm function is created in $CONFIGFS_ROOT/usb_gadget/<gadget>/functions
a tpg can be created in $CONFIGFS_ROOT/target/usb_gadget/<wwn>/, but after
a tpg is created the tcm function must not be removed until its
corresponding tpg is gone. While the configfs_depend/undepend_item() are
meant exactly for creating this kind of dependencies, they are not suitable
if the other kernel subsystem happens to be another subsystem in configfs,
so this patch adds unlocked versions meant for configfs callbacks.

Above description has been provided by:
Andrzej Pietrasiewicz <andrzej.p@samsung.com>

In configfs_depend_item() we have to consider two possible cases:

1) When we are called to depend another item in the same subsystem
   as caller
	In this case we should skip locking configfs root as we know
	that configfs is in valid state and our subsystem will not
	be unregistered during this call.

2) When we are called to depend item in different subsystem than
   our caller
	In this case we are also sure that configfs is in valid state
	but we have to lock root of configfs to avoid unregistration
	of target's subsystem. As it is other than caller's subsystem,
	there may be nothing what protects us against unregistration
	of that subsystem.

Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2015-12-20 18:04:03 -08:00
..
9p Merge branch 'for-linus-3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-11-13 18:02:30 -08:00
adfs
affs fs/affs: make root lookup from blkdev logical size 2015-09-10 13:29:01 -07:00
afs
autofs4
befs
bfs
btrfs Merge branch 'for-linus-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2015-11-13 16:30:29 -08:00
cachefiles FS-Cache: Add missing initialization of ret in cachefiles_write_page() 2015-11-16 20:38:43 -05:00
ceph Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2015-11-13 09:24:40 -08:00
cifs Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6 2015-11-13 16:40:36 -08:00
coda fs/coda: fix readlink buffer overflow 2015-09-10 13:29:01 -07:00
configfs fs: configfs: Add unlocked version of configfs_depend_item() 2015-12-20 18:04:03 -08:00
cramfs
debugfs debugfs: fix refcount imbalance in start_creating 2015-11-11 02:04:44 -05:00
devpts
dlm Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-11-13 20:04:17 -08:00
ecryptfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-11-07 13:05:44 -08:00
efivarfs
efs
exofs fs/exofs/namei.c: remove unnecessary new_valid_dev() check 2015-11-09 15:11:24 -08:00
exportfs
ext2 ext2, ext4: warn when mounting with dax enabled 2015-11-16 09:43:54 -08:00
ext4 ext2, ext4: warn when mounting with dax enabled 2015-11-16 09:43:54 -08:00
f2fs Merge branch 'for-linus-3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-11-13 18:02:30 -08:00
fat fat: fix fake_offset handling on error path 2015-11-20 16:17:32 -08:00
freevxfs
fscache FS-Cache: Handle a write to the page immediately beyond the EOF marker 2015-11-11 02:11:02 -05:00
fuse Move locks API users to locks_lock_inode_wait() 2015-10-22 14:57:36 -04:00
gfs2 Merge branch 'for-linus-3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-11-13 18:02:30 -08:00
hfs hfs: fix B-tree corruption after insertion at position 0 2015-09-10 13:29:01 -07:00
hfsplus xattr handlers: Pass handler to operations instead of flags 2015-11-13 20:34:32 -05:00
hostfs fs: create and use seq_show_option for escaping 2015-09-04 16:54:41 -07:00
hpfs fs/hpfs/namei.c: remove unnecessary new_valid_dev() check 2015-11-09 15:11:24 -08:00
hugetlbfs mm/hugetlbfs: fix bugs in fallocate hole punch of areas with holes 2015-11-20 16:17:32 -08:00
isofs
jbd2 Merge branch 'akpm' (patches from Andrew) 2015-11-07 14:32:45 -08:00
jffs2 xattr handlers: Pass handler to operations instead of flags 2015-11-13 20:34:32 -05:00
jfs fs/jfs: remove unnecessary new_valid_dev() checks 2015-11-09 15:11:24 -08:00
kernfs
lockd Mainly smaller bugfixes and cleanup. We're still finding some bugs from 2015-11-11 20:11:28 -08:00
logfs mm, fs: introduce mapping_gfp_constraint() 2015-11-06 17:50:42 -08:00
minix
ncpfs ncpfs: don't allow negative timeouts 2015-11-20 16:17:32 -08:00
nfs Merge branch 'for-linus-3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-11-13 18:02:30 -08:00
nfs_common
nfsd nfsd: fix race with open / open upgrade stateids 2015-11-10 09:29:45 -05:00
nilfs2 Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-11-11 09:45:24 -08:00
nls
notify inotify: actually check for invalid bits in sys_inotify_add_watch() 2015-11-05 19:34:48 -08:00
ntfs mm, fs: introduce mapping_gfp_constraint() 2015-11-06 17:50:42 -08:00
ocfs2 fs: configfs: Drop unused parameter from configfs_undepend_item() 2015-12-20 18:03:57 -08:00
omfs
openpromfs
overlayfs Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 2015-10-31 14:49:19 -07:00
proc Merge branch 'akpm' (patches from Andrew) 2015-11-07 14:32:45 -08:00
pstore pstore: fix code comment to match code 2015-11-02 13:41:52 -08:00
qnx4
qnx6
quota Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-09-05 20:34:28 -07:00
ramfs mm, fs: obey gfp_mapping for add_to_page_cache() 2015-10-16 11:42:28 -07:00
reiserfs Merge branch 'for-linus-3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-11-13 18:02:30 -08:00
romfs
squashfs squashfs: xattr simplifications 2015-11-13 20:34:33 -05:00
sysfs platform/chrome: Branch for v4.4 2015-11-13 21:53:18 -08:00
sysv
tracefs tracefs: Fix refcount imbalance in start_creating() 2015-11-04 22:13:45 -05:00
ubifs Merge branch 'for-linus-3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-11-13 18:02:30 -08:00
udf
ufs fix ufs write vs readpage race when writing into a hole 2015-09-09 10:43:12 -07:00
xfs Merge branch 'for-linus-3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-11-13 18:02:30 -08:00
aio.c mm: move ->mremap() from file_operations to vm_operations_struct 2015-09-04 16:54:41 -07:00
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf.c Merge branch 'for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-11-11 09:45:24 -08:00
binfmt_elf_fdpic.c libnvdimm for 4.4: 2015-11-10 12:07:22 -08:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
block_dev.c block: protect rw_page against device teardown 2015-11-19 13:47:10 -08:00
buffer.c vfs: remove unused wrapper block_page_mkwrite() 2015-11-11 02:19:33 -05:00
char_dev.c
compat.c
compat_binfmt_elf.c
compat_ioctl.c i2c-dev: Fix typo in ioctl name reference 2015-10-23 23:26:43 +02:00
coredump.c coredump: change zap_threads() and zap_process() to use for_each_thread() 2015-11-06 17:50:42 -08:00
dax.c dax: disable pmd mappings 2015-11-16 23:54:45 -08:00
dcache.c
dcookies.c
direct-io.c Merge branch 'for-4.4/io-poll' of git://git.kernel.dk/linux-block 2015-11-10 17:23:49 -08:00
drop_caches.c
eventfd.c
eventpoll.c
exec.c
fcntl.c
fhandle.c
file.c vfs: clear remainder of 'full_fds_bits' in dup_fd() 2015-11-05 23:05:32 -08:00
file_table.c
filesystems.c
fs-writeback.c fs: fix writeback.c kernel-doc warnings 2015-11-11 02:18:27 -05:00
fs_pin.c
fs_struct.c
inode.c fs: fix inode.c kernel-doc warning 2015-11-11 02:18:27 -05:00
internal.h
ioctl.c
Kconfig dax: disable pmd mappings 2015-11-16 23:54:45 -08:00
Kconfig.binfmt
libfs.c
locks.c locks: cleanup posix_lock_inode_wait and flock_lock_inode_wait 2015-10-22 14:57:42 -04:00
Makefile ext4: promote ext4 over ext2 in the default probe order 2015-10-15 10:33:21 -04:00
mbcache.c
mount.h
mpage.c mm, fs: introduce mapping_gfp_constraint() 2015-11-06 17:50:42 -08:00
namei.c Merge branch 'akpm' (patches from Andrew) 2015-11-07 14:32:45 -08:00
namespace.c
no-block.c
nsfs.c fs/seq_file: convert int seq_vprint/seq_printf/etc... returns to void 2015-09-11 15:21:34 -07:00
open.c
pipe.c fs/pipe.c: return error code rather than 0 in pipe_write() 2015-11-11 02:18:26 -05:00
pnode.c
pnode.h
posix_acl.c xattr handlers: Pass handler to operations instead of flags 2015-11-13 20:34:32 -05:00
proc_namespace.c
read_write.c
readdir.c
select.c
seq_file.c fs, seqfile: always allow oom killer 2015-11-06 17:50:42 -08:00
signalfd.c
splice.c mm, fs: introduce mapping_gfp_constraint() 2015-11-06 17:50:42 -08:00
stack.c
stat.c fs/stat.c: remove unnecessary new_valid_dev() check 2015-11-09 15:11:24 -08:00
statfs.c
super.c
sync.c fs/sync.c: make sync_file_range(2) use WB_SYNC_NONE writeback 2015-11-06 17:50:42 -08:00
timerfd.c
userfaultfd.c userfaultfd: revert "userfaultfd: waitqueue: add nr wake parameter to __wake_up_locked_key" 2015-09-22 15:09:53 -07:00
utimes.c
xattr.c 9p: xattr simplifications 2015-11-13 20:34:33 -05:00