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Waiman Long 1812997720 dcache: get/release read lock in read_seqbegin_or_lock() & friend 
This patch modifies read_seqbegin_or_lock() and need_seqretry() to use
newly introduced read_seqlock_excl() and read_sequnlock_excl()
primitives so that they won't change the sequence number even if they
fall back to take the lock.  This is OK as no change to the protected
data structure is being made.

It will prevent one fallback to lock taking from cascading into a series
of lock taking reducing performance because of the sequence number
change.  It will also allow other sequence readers to go forward while
an exclusive reader lock is taken.

This patch also updates some of the inaccurate comments in the code.

Signed-off-by: Waiman Long <Waiman.Long@hp.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-12 09:25:23 -07:00
..
9p
fs/9p: avoid accessing utsname after namespace has been torn down
2013-08-26 10:28:46 -05:00
adfs
Don't pass inode to ->d_hash() and ->d_compare()
2013-06-29 12:57:36 +04:00
affs
affs: use loff_t in affs_truncate()
2013-09-11 15:59:29 -07:00
afs
afs: get rid of redundant ->d_name.len checks
2013-09-07 19:54:55 -04:00
autofs4
autofs4 - fix device ioctl mount lookup
2013-09-08 22:07:47 -04:00
befs
[readdir] convert befs
2013-06-29 12:56:55 +04:00
bfs
bfs: iget_locked() doesn't return an ERR_PTR
2013-08-24 12:10:22 -04:00
btrfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2013-09-06 09:36:28 -07:00
cachefiles
CacheFiles: Implement interface to check cache consistency
2013-09-06 09:17:30 +01:00
ceph
ceph: use d_invalidate() to invalidate aliases
2013-09-06 12:55:29 -07:00
cifs
CIFS: Respect epoch value from create lease context v2
2013-09-09 22:52:18 -05:00
coda
helper for reading ->d_count
2013-07-05 18:59:33 +04:00
configfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-07-14 11:42:26 -07:00
cramfs
[readdir] convert f2fs
2013-06-29 12:56:46 +04:00
debugfs
debugfs: debugfs_remove_recursive() must not rely on list_empty(d_subdirs)
2013-07-31 12:16:31 -04:00
devpts
fs: Limit sys_mount to only request filesystem modules (Part 2).
2013-03-07 01:08:55 -08:00
dlm
dlm: remove signal blocking
2013-08-12 15:22:43 -05:00
ecryptfs
ecryptfs: avoid ctx initialization race
2013-09-06 16:58:18 -07:00
efivarfs
efivarfs: we can use simple_lookup() now
2013-07-14 17:48:35 +04:00
efs
efs: iget_locked() doesn't return an ERR_PTR()
2013-08-24 12:10:22 -04:00
exofs
Lots of bug fixes, cleanups and optimizations. In the bug fixes
2013-07-02 09:39:34 -07:00
exportfs
exportfs: don't assume that ->iterate() won't feed us too long entries
2013-09-07 19:54:55 -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
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2013-09-06 09:06:02 -07:00
ext4
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2013-09-06 09:36:28 -07:00
f2fs
f2fs: optimize gc for better performance
2013-09-05 13:50:32 +09:00
fat
fatfs: add FAT_IOCTL_GET_VOLUME_ID
2013-07-09 10:33:25 -07:00
freevxfs
[readdir] convert freevxfs
2013-06-29 12:56:53 +04:00
fscache
lib/radix-tree.c: make radix_tree_node_alloc() work correctly within interrupt
2013-09-11 15:59:36 -07:00
fuse
mm/page-writeback.c: add strictlimit feature
2013-09-11 15:58:04 -07:00
gfs2
This is possibly the smallest ever set of GFS2 patches for a merge
2013-09-09 09:16:51 -07:00
hfs
Don't pass inode to ->d_hash() and ->d_compare()
2013-06-29 12:57:36 +04:00
hfsplus
hfsplus: integrate POSIX ACLs support into driver
2013-09-11 15:59:01 -07:00
hostfs
um: hostfs: Fix writeback
2013-09-07 10:38:29 +02:00
hpfs
Merge branch 'hpfs' from Mikulas Patocka
2013-07-04 11:22:55 -07:00
hppfs
clean up scary strncpy(dst, src, strlen(src)) uses
2013-07-03 16:07:41 -07:00
hugetlbfs
cope with potentially long ->d_dname() output for shmem/hugetlb
2013-08-24 12:10:17 -04:00
isofs
isofs: Refuse RW mount of the filesystem instead of making it RO
2013-07-31 22:14:50 +02:00
jbd
jbd: use a single printk for jbd_debug()
2013-08-09 10:49:00 +02:00
jbd2
jbd2: Fix endian mixing problems in the checksumming code
2013-08-28 14:59:58 -04:00
jffs2
[readdir] convert jffs2
2013-06-29 12:56:47 +04:00
jfs
jfs: fix readdir cookie incompatibility with NFSv4
2013-08-15 17:22:29 -05:00
lockd
LOCKD: Don't call utsname()->nodename from nlmclnt_setlockargs
2013-08-05 15:03:46 -04:00
logfs
Lots of bug fixes, cleanups and optimizations. In the bug fixes
2013-07-02 09:39:34 -07:00
minix
minix: bug widening a binary "not" operation
2013-06-29 12:57:35 +04:00
ncpfs
ncpfs: fix error return code in ncp_parse_options()
2013-07-09 10:33:25 -07:00
nfs
NFS client updates for Linux 3.12
2013-09-09 09:19:15 -07:00
nfs_common
nfs_common: Update the translation between nfsv3 acls linux posix acls
2013-02-13 06:15:14 -08:00
nfsd
Merge branch 'nfsd-next' of git://linux-nfs.org/~bfields/linux
2013-09-10 20:04:59 -07:00
nilfs2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-09-05 08:50:26 -07:00
nls
…
notify
fsnotify: update comments concerning locking scheme
2013-07-09 10:33:20 -07:00
ntfs
Lots of bug fixes, cleanups and optimizations. In the bug fixes
2013-07-02 09:39:34 -07:00
ocfs2
ocfs2: fix the end cluster offset of FIEMAP
2013-09-11 15:56:53 -07:00
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
vmcore: enable /proc/vmcore mmap for s390
2013-09-11 15:59:14 -07:00
pstore
pstore/ram: (really) fix undefined usage of rounddown_pow_of_two
2013-08-30 15:57:01 -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
xfs: update for v3.12-rc1
2013-09-09 11:19:09 -07:00
ramfs
initmpfs: move rootfs code from fs/ramfs/ to init/
2013-09-11 15:59:37 -07:00
reiserfs
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
2013-09-06 09:06:02 -07:00
romfs
[readdir] convert romfs
2013-06-29 12:56:29 +04:00
squashfs
Squashfs: add corruption check for type in squashfs_readdir()
2013-09-06 04:57:54 +01:00
sysfs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-09-07 14:36:57 -07:00
sysv
Don't pass inode to ->d_hash() and ->d_compare()
2013-06-29 12:57:36 +04:00
ubifs
Only a single patch which fixes a message.
2013-07-05 12:08:47 -07:00
udf
udf: Refuse RW mount of the filesystem instead of making it RO
2013-07-31 22:14:51 +02:00
ufs
[readdir] simple local unixlike: switch to ->iterate()
2013-06-29 12:46:47 +04:00
xfs
xfs: update for v3.12-rc1
2013-09-09 11:19:09 -07:00
aio.c
aio: fix wrong comment in aio_complete()
2013-07-03 16:08:06 -07:00
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
mm: remove free_area_cache
2013-07-10 18:11:34 -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
mm: remove free_area_cache
2013-07-10 18:11:34 -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
fs/bio-integrity: fix a potential mem leak
2013-09-11 15:58:21 -07:00
bio.c
Merge branch 'for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2013-09-03 18:25:03 -07:00
block_dev.c
direct-io: Handle O_(D)SYNC AIO
2013-09-04 09:23:46 -04:00
buffer.c
mm: vmscan: take page buffers dirty and locked state into account
2013-07-03 16:07:29 -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
coredump: add new %P variable in core_pattern
2013-09-11 15:59:01 -07:00
coredump.h
…
dcache.c
dcache: get/release read lock in read_seqbegin_or_lock() & friend
2013-09-12 09:25:23 -07:00
dcookies.c
consolidate compat lookup_dcookie()
2013-03-03 23:00:23 -05:00
direct-io.c
direct-io: Use return from cmpxchg to decide of assignment happened
2013-09-09 10:47:42 -07:00
drop_caches.c
…
eventfd.c
…
eventpoll.c
epoll: add a reschedule point in ep_free()
2013-09-11 15:58:50 -07:00
exec.c
exec: cleanup the error handling in search_binary_handler()
2013-09-11 15:59:09 -07:00
fcntl.c
vfs: add missing check for __O_TMPFILE in fcntl_init()
2013-08-05 18:25:32 +04:00
fhandle.c
…
file_table.c
fs/file_table.c:fput(): make comment more truthful
2013-09-11 15:59:01 -07:00
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
writeback: fix race that cause writeback hung
2013-09-11 15:58:13 -07:00
generic_acl.c
…
inode.c
constify touch_atime()
2013-09-03 22:52:45 -04:00
internal.h
rename user_path_umountat() to user_path_mountpoint_at()
2013-09-08 20:20:21 -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
make simple_lookup() usable for filesystems that set ->s_d_op
2013-07-14 17:43:25 +04:00
locks.c
locks: move file_lock_list to a set of percpu hlist_heads and convert file_lock_lock to an lglock
2013-07-08 13:36:42 +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
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-09-10 12:44:24 -07:00
namespace.c
initmpfs: move rootfs code from fs/ramfs/ to init/
2013-09-11 15:59:37 -07:00
no-block.c
…
open.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2013-09-07 14:35:32 -07:00
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
vfs: Don't copy mount bind mounts of /proc/<pid>/ns/mnt between namespaces
2013-08-26 18:42:15 -07:00
posix_acl.c
…
proc_namespace.c
…
read_write.c
vfs: export lseek_execute() to modules
2013-07-03 16:23:27 +04:00
readdir.c
[readdir] constify ->actor
2013-06-29 12:57:05 +04:00
select.c
net: rename include/net/ll_poll.h to include/net/busy_poll.h
2013-07-10 17:08:27 -07:00
seq_file.c
seq_file: add seq_list_*_percpu helpers
2013-07-08 13:36:41 +04:00
signalfd.c
switch signalfd{,4}() to COMPAT_SYSCALL_DEFINE
2013-03-03 22:58:46 -05:00
splice.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-07-03 09:10:19 -07:00
stack.c
…
stat.c
quota: provide interface for readding allocated space into reserved space
2013-08-17 09:32:32 -04:00
statfs.c
…
super.c
prune_super(): sb->s_op is never NULL
2013-09-07 19:54:56 -04:00
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
timerfd: Add alarm timers
2013-05-29 12:57:34 -07:00
utimes.c
…
xattr_acl.c
…
xattr.c
…