Jeff Layton 1c8c601a8c locks: protect most of the file_lock handling with i_lock ... Having a global lock that protects all of this code is a clear scalability problem. Instead of doing that, move most of the code to be protected by the i_lock instead. The exceptions are the global lists that the ->fl_link sits on, and the ->fl_block list. ->fl_link is what connects these structures to the global lists, so we must ensure that we hold those locks when iterating over or updating these lists. Furthermore, sound deadlock detection requires that we hold the blocked_list state steady while checking for loops. We also must ensure that the search and update to the list are atomic. For the checking and insertion side of the blocked_list, push the acquisition of the global lock into __posix_lock_file and ensure that checking and update of the blocked_list is done without dropping the lock in between. On the removal side, when waking up blocked lock waiters, take the global lock before walking the blocked list and dequeue the waiters from the global list prior to removal from the fl_block list. With this, deadlock detection should be race free while we minimize excessive file_lock_lock thrashing. Finally, in order to avoid a lock inversion problem when handling /proc/locks output we must ensure that manipulations of the fl_block list are also protected by the file_lock_lock. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>		2013-06-29 12:57:42 +04:00
..
9p	[readdir] convert 9p	2013-06-29 12:56:45 +04:00
adfs	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
affs	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
afs	locks: protect most of the file_lock handling with i_lock	2013-06-29 12:57:42 +04:00
autofs4	[readdir] switch dcache_readdir() users to ->iterate()	2013-06-29 12:46:48 +04:00
befs	[readdir] convert befs	2013-06-29 12:56:55 +04:00
bfs	[readdir] convert bfs	2013-06-29 12:56:33 +04:00
btrfs	btrfs: more open-coded file_inode()	2013-06-29 12:57:24 +04:00
cachefiles	lift sb_start_write() out of ->write()	2013-04-09 14:12:56 -04:00
ceph	locks: protect most of the file_lock handling with i_lock	2013-06-29 12:57:42 +04:00
cifs	locks: protect most of the file_lock handling with i_lock	2013-06-29 12:57:42 +04:00
coda	coda: don't bother with find_inode_number()	2013-06-29 12:57:20 +04:00
configfs	[readdir] convert configfs	2013-06-29 12:56:30 +04:00
cramfs	[readdir] convert f2fs	2013-06-29 12:56:46 +04:00
debugfs	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
devpts	fs: Limit sys_mount to only request filesystem modules (Part 2).	2013-03-07 01:08:55 -08:00
dlm	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2013-05-01 14:08:52 -07:00
ecryptfs	ecryptfs: switch ecryptfs_decode_and_decrypt_filename() from dentry to sb	2013-06-29 12:57:25 +04:00
efivarfs	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
efs	[readdir] convert efs	2013-06-29 12:56:31 +04:00
exofs	[readdir] convert exofs	2013-06-29 12:56:34 +04:00
exportfs	[readdir] constify ->actor	2013-06-29 12:57:05 +04:00
ext2	[O_TMPFILE] it's still short a few helpers, but infrastructure should be OK now...	2013-06-29 12:57:10 +04:00
ext3	ext3 ->tmpfile() support	2013-06-29 12:57:12 +04:00
ext4	[readdir] convert ext4	2013-06-29 12:56:40 +04:00
f2fs	[readdir] convert f2fs	2013-06-29 12:56:46 +04:00
fat	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
freevxfs	[readdir] convert freevxfs	2013-06-29 12:56:53 +04:00
fscache	fs/fscache/stats.c: fix memory leak	2013-04-29 15:54:27 -07:00
fuse	fuse: another open-coded file_inode()	2013-06-29 12:57:24 +04:00
gfs2	locks: protect most of the file_lock handling with i_lock	2013-06-29 12:57:42 +04:00
hfs	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
hfsplus	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
hostfs	[readdir] convert hostfs	2013-06-29 12:56:59 +04:00
hpfs	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
hppfs	[readdir] convert procfs	2013-06-29 12:56:32 +04:00
hugetlbfs	hugetlbfs: fix mmap failure in unaligned size request	2013-05-07 18:38:27 -07:00
isofs	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
jbd	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs	2013-05-03 09:56:25 -07:00
jbd2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-05-01 17:51:54 -07:00
jffs2	[readdir] convert jffs2	2013-06-29 12:56:47 +04:00
jfs	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
lockd	locks: protect most of the file_lock handling with i_lock	2013-06-29 12:57:42 +04:00
logfs	[readdir] convert logfs	2013-06-29 12:56:43 +04:00
minix	minix: bug widening a binary "not" operation	2013-06-29 12:57:35 +04:00
ncpfs	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
nfs	locks: protect most of the file_lock handling with i_lock	2013-06-29 12:57:42 +04:00
nfs_common	nfs_common: Update the translation between nfsv3 acls linux posix acls	2013-02-13 06:15:14 -08:00
nfsd	locks: protect most of the file_lock handling with i_lock	2013-06-29 12:57:42 +04:00
nilfs2	[readdir] convert nilfs2	2013-06-29 12:56:36 +04:00
nls
notify	fanotify: quit wanking with FASYNC in ->release()	2013-06-29 12:57:23 +04:00
ntfs	[readdir] convert ntfs	2013-06-29 12:56:48 +04:00
ocfs2	[readdir] convert ocfs2	2013-06-29 12:57:02 +04:00
omfs	[readdir] convert omfs	2013-06-29 12:56:37 +04:00
openpromfs	[readdir] convert openpromfs	2013-06-29 12:56:32 +04:00
proc	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
pstore	Couple of pstore cleanups	2013-05-09 16:42:10 -07:00
qnx4	[readdir] convert qnx4	2013-06-29 12:56:38 +04:00
qnx6	[readdir] convert qnx6	2013-06-29 12:56:39 +04:00
quota	quota: add missing use of dq_data_lock in __dquot_initialize	2013-03-11 22:05:56 +01:00
ramfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-02-26 20:16:07 -08:00
reiserfs	reiserfs: switch reiserfs_readdir_dentry to inode	2013-06-29 12:56:51 +04:00
romfs	[readdir] convert romfs	2013-06-29 12:56:29 +04:00
squashfs	[readdir] convert squashfs	2013-06-29 12:56:28 +04:00
sysfs	[readdir] convert sysfs	2013-06-29 12:56:36 +04:00
sysv	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
ubifs	[readdir] convert ubifs	2013-06-29 12:56:25 +04:00
udf	udf: provide ->tmpfile()	2013-06-29 12:57:12 +04:00
ufs	[readdir] simple local unixlike: switch to ->iterate()	2013-06-29 12:46:47 +04:00
xfs	[readdir] convert xfs	2013-06-29 12:57:00 +04:00
aio.c	constify rw_verify_area()	2013-06-29 12:57:34 +04:00
anon_inodes.c	get_empty_filp()/alloc_file() leave both ->f_pos and ->f_version zero	2013-02-26 02:46:11 -05:00
attr.c
bad_inode.c	[readdir] ->readdir() is gone	2013-06-29 12:57:04 +04:00
binfmt_aout.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-05-01 17:51:54 -07:00
binfmt_elf_fdpic.c	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2013-05-02 10:16:16 -07:00
binfmt_elf.c	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2013-05-02 10:16:16 -07:00
binfmt_em86.c
binfmt_flat.c	new helper: read_code()	2013-04-29 15:40:23 -04:00
binfmt_misc.c	binfmt_misc: reuse string_unescape_inplace()	2013-04-30 17:04:03 -07:00
binfmt_script.c
binfmt_som.c
bio-integrity.c	bio-integrity: Add explicit field for owner of bip_buf	2013-03-23 14:26:34 -07:00
bio.c	Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block	2013-05-08 10:13:35 -07:00
block_dev.c	Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block	2013-05-08 10:13:35 -07:00
buffer.c	Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block	2013-05-08 10:13:35 -07:00
char_dev.c
compat_binfmt_elf.c
compat_ioctl.c	compat.c: LOOP_CLR_FD is taken care of in loop.c itself...	2013-06-29 12:46:44 +04:00
compat.c	[readdir] constify ->actor	2013-06-29 12:57:05 +04:00
coredump.c	do_coredump(): don't wait for thaw if coredump has already been interrupted	2013-05-04 14:45:54 -04:00
coredump.h
dcache.c	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
dcookies.c	consolidate compat lookup_dcookie()	2013-03-03 23:00:23 -05:00
direct-io.c	Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block	2013-05-08 10:13:35 -07:00
drop_caches.c
eventfd.c
eventpoll.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal	2013-05-01 07:21:43 -07:00
exec.c	allow build_open_flags() to return an error	2013-06-29 12:57:09 +04:00
fcntl.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
fhandle.c
file_table.c	Replace a bunch of file->dentry->d_inode refs with file_inode()	2013-06-29 12:57:13 +04:00
file.c	don't bother with deferred freeing of fdtables	2013-05-01 17:31:42 -04:00
filesystems.c	fs: Limit sys_mount to only request filesystem modules.	2013-03-03 19:36:31 -08:00
fs_struct.c	constify path_get/path_put and fs_struct.c stuff	2013-03-01 23:51:07 -05:00
fs-writeback.c	Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block	2013-05-08 10:13:35 -07:00
generic_acl.c
inode.c	allow the temp files created by open() to be linked to	2013-06-29 12:57:11 +04:00
internal.h	constify rw_verify_area()	2013-06-29 12:57:34 +04:00
ioctl.c	new helper: file_inode(file)	2013-02-22 23:31:31 -05:00
ioprio.c
Kconfig	efivarfs: Move to fs/efivarfs	2013-04-17 13:25:09 +01:00
Kconfig.binfmt	fs: make binfmt support for #! scripts modular and removable	2013-04-30 17:04:04 -07:00
libfs.c	[readdir] switch dcache_readdir() users to ->iterate()	2013-06-29 12:46:48 +04:00
locks.c	locks: protect most of the file_lock handling with i_lock	2013-06-29 12:57:42 +04:00
Makefile	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-05-01 17:51:54 -07:00
mbcache.c
mount.h	get rid of full-hash scan on detaching vfsmounts	2013-04-09 14:12:52 -04:00
mpage.c
namei.c	Don't pass inode to ->d_hash() and ->d_compare()	2013-06-29 12:57:36 +04:00
namespace.c	create_mnt_ns: unidiomatic use of list_add()	2013-05-04 15:18:53 -04:00
no-block.c
open.c	[O_TMPFILE] it's still short a few helpers, but infrastructure should be OK now...	2013-06-29 12:57:10 +04:00
pipe.c	aio: don't include aio.h in sched.h	2013-05-07 20:16:25 -07:00
pnode.c	vfs: Fix invalid ida_remove() call	2013-05-31 15:16:33 -04:00
pnode.h	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-05-01 17:51:54 -07:00
posix_acl.c
proc_namespace.c
read_write.c	constify rw_verify_area()	2013-06-29 12:57:34 +04:00
readdir.c	[readdir] constify ->actor	2013-06-29 12:57:05 +04:00
select.c	sched/rt: Move rt specific bits into new header file	2013-02-07 20:51:08 +01:00
seq_file.c	new helper: single_open_size()	2013-04-09 14:13:29 -04:00
signalfd.c	switch signalfd{,4}() to COMPAT_SYSCALL_DEFINE	2013-03-03 22:58:46 -05:00
splice.c	splice: lift checks from do_splice_from() into callers	2013-06-29 12:57:35 +04:00
stack.c
stat.c	switch vfs_getattr() to struct path	2013-02-26 02:46:08 -05:00
statfs.c
super.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
sync.c	teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long	2013-03-03 22:46:22 -05:00
timerfd.c	compat: restore timerfd settime and gettime compat syscalls	2013-03-02 09:35:13 -05:00
utimes.c
xattr_acl.c
xattr.c