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Jens Axboe abf137dd77 aio: make the lookup_ioctx() lockless 
The mm->ioctx_list is currently protected by a reader-writer lock,
so we always grab that lock on the read side for doing ioctx
lookups. As the workload is extremely reader biased, turn this into
an rcu hlist so we can make lookup_ioctx() lockless. Get rid of
the rwlock and use a spinlock for providing update side exclusion.

There's usually only 1 entry on this list, so it doesn't make sense
to look into fancier data structures.

Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
 		2008-12-29 08:29:50 +01:00
..
9p Merge branch 'next' into for-linus 2008-12-25 11:40:09 +11:00
adfs vfs: Use const for kernel parser table 2008-10-13 10:10:37 -07:00
affs CRED: Wrap task credential accesses in the AFFS filesystem 2008-11-14 10:38:45 +11:00
afs fs: replace NIPQUAD() 2008-10-31 00:56:28 -07:00
autofs CRED: Wrap task credential accesses in the autofs filesystem 2008-11-14 10:38:45 +11:00
autofs4 Merge branch 'master' into next 2008-11-14 11:29:12 +11:00
befs befs: annotate fs32 on tests for superblock endianness 2008-10-16 11:21:46 -07:00
bfs CRED: Wrap task credential accesses in the BFS filesystem 2008-11-14 10:38:47 +11:00
cifs cifs: update for new IP4/6 address printing 2008-12-28 16:29:58 -08:00
coda coda: fix creds reference 2008-11-20 08:11:52 +11:00
configfs [PATCH] assorted path_lookup() -> kern_path() conversions 2008-10-23 05:12:52 -04:00
cramfs cramfs: fix named-pipe handling 2008-08-20 15:40:32 -07:00
debugfs integrity: special fs magic 2008-10-13 09:47:43 +11:00
devpts CRED: Wrap task credential accesses in the devpts filesystem 2008-11-14 10:38:49 +11:00
dlm fix warning in fs/dlm/netlink.c 2008-11-25 16:51:45 -08:00
ecryptfs Merge branch 'master' into next 2008-12-04 17:16:36 +11:00
efs [PATCH] switch all filesystems over to d_obtain_alias 2008-10-23 05:13:01 -04:00
exportfs Merge branch 'next' into for-linus 2008-12-25 11:40:09 +11:00
ext2 CRED: Wrap task credential accesses in the Ext2 filesystem 2008-11-14 10:38:50 +11:00
ext3 Merge branch 'master' into next 2008-11-14 11:29:12 +11:00
ext4 Merge branch 'next' into for-linus 2008-12-25 11:40:09 +11:00
fat Merge branch 'master' into next 2008-11-14 11:29:12 +11:00
freevxfs fs/freevxfs/: proper externs 2008-04-29 08:06:00 -07:00
fuse CRED: Use RCU to access another task's creds and to release a task's own creds 2008-11-14 10:39:19 +11:00
gfs2 CRED: Wrap task credential accesses in the GFS2 filesystem 2008-11-14 10:38:53 +11:00
hfs CRED: Wrap task credential accesses in the HFS filesystem 2008-11-14 10:38:54 +11:00
hfsplus CRED: Wrap task credential accesses in the HFSplus filesystem 2008-11-14 10:38:54 +11:00
hostfs hostfs: fix a duplicated global function name 2008-11-19 18:50:00 -08:00
hpfs CRED: Wrap task credential accesses in the HPFS filesystem 2008-11-14 10:38:55 +11:00
hppfs CRED: Use creds in file structs 2008-11-14 10:39:25 +11:00
hugetlbfs CRED: Wrap current->cred and a few other accessors 2008-11-14 10:39:18 +11:00
isofs [PATCH] switch all filesystems over to d_obtain_alias 2008-10-23 05:13:01 -04:00
jbd jbd: don't give up looking for space so easily in __log_wait_for_space 2008-11-06 22:37:59 -05:00
jbd2 jbd2: don't give up looking for space so easily in __jbd2_log_wait_for_space 2008-11-06 22:38:07 -05:00
jffs2 Merge git://git.infradead.org/mtd-2.6 2008-11-06 15:43:13 -08:00
jfs CRED: Wrap task credential accesses in the JFS filesystem 2008-11-14 10:38:56 +11:00
lockd Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-12-15 20:03:50 -08:00
minix CRED: Wrap task credential accesses in the Minix filesystem 2008-11-14 10:38:57 +11:00
ncpfs CRED: Wrap task credential accesses in the NCPFS filesystem 2008-11-14 10:38:58 +11:00
nfs fs: replace NIPQUAD() 2008-10-31 00:56:28 -07:00
nfs_common
…
nfsd Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
nls remove CONFIG_KMOD from fs 2008-10-17 02:38:36 +11:00
ntfs ntfs: don't fool kernel-doc 2008-12-01 19:55:25 -08:00
ocfs2 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
omfs CRED: Wrap task credential accesses in the OMFS filesystem 2008-11-14 10:38:59 +11:00
openpromfs [PATCH] fix ->llseek for more directories 2008-10-23 05:13:21 -04:00
partitions block/md: fix md autodetection 2008-11-18 15:08:56 +01:00
proc Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-12-28 16:54:33 -08:00
qnx4 SL*B: drop kmem cache argument from constructor 2008-07-26 12:00:07 -07:00
ramfs CRED: Wrap task credential accesses in the RAMFS filesystem 2008-11-14 10:39:00 +11:00
reiserfs CRED: Wrap task credential accesses in the ReiserFS filesystem 2008-11-14 10:39:01 +11:00
romfs romfs_readpage: don't report errors for pages beyond i_size 2008-07-30 14:30:34 -07:00
smbfs CRED: Wrap current->cred and a few other accessors 2008-11-14 10:39:18 +11:00
sysfs [PATCH] fix ->llseek for more directories 2008-10-23 05:13:21 -04:00
sysv CRED: Wrap task credential accesses in the SYSV filesystem 2008-11-14 10:39:02 +11:00
ubifs Merge branch 'master' into next 2008-12-04 17:16:36 +11:00
udf Merge branch 'master' into next 2008-12-04 17:16:36 +11:00
ufs CRED: Wrap task credential accesses in the UFS filesystem 2008-11-14 10:39:04 +11:00
xfs Merge branch 'next' into for-linus 2008-12-25 11:40:09 +11:00
Kconfig [patch 1/3] FS_MBCACHE: don't needlessly make it built-in 2008-10-23 05:13:26 -04:00
Kconfig.binfmt add CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 2008-10-20 08:52:39 -07:00
Makefile fat: move fs/vfat/* and fs/msdos/* to fs/fat 2008-11-06 15:41:20 -08:00
aio.c aio: make the lookup_ioctx() lockless 2008-12-29 08:29:50 +01:00
anon_inodes.c CRED: Wrap task credential accesses in the filesystem subsystem 2008-11-14 10:39:05 +11:00
attr.c CRED: Wrap task credential accesses in the filesystem subsystem 2008-11-14 10:39:05 +11:00
bad_inode.c [PATCH] sanitize ->permission() prototype 2008-07-26 20:53:14 -04:00
binfmt_aout.c CRED: Make execve() take advantage of copy-on-write credentials 2008-11-14 10:39:24 +11:00
binfmt_elf.c Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6 2008-12-28 12:33:21 -08:00
binfmt_elf_fdpic.c CRED: Make execve() take advantage of copy-on-write credentials 2008-11-14 10:39:24 +11:00
binfmt_em86.c Allow recursion in binfmt_script and binfmt_misc 2008-10-16 11:21:38 -07:00
binfmt_flat.c CRED: Make execve() take advantage of copy-on-write credentials 2008-11-14 10:39:24 +11:00
binfmt_misc.c Allow recursion in binfmt_script and binfmt_misc 2008-10-16 11:21:38 -07:00
binfmt_script.c Allow recursion in binfmt_script and binfmt_misc 2008-10-16 11:21:38 -07:00
binfmt_som.c CRED: Make execve() take advantage of copy-on-write credentials 2008-11-14 10:39:24 +11:00
bio-integrity.c bio: allow individual slabs in the bio_set 2008-12-29 08:29:23 +01:00
bio.c bio: add support for inlining a number of bio_vecs inside the bio 2008-12-29 08:29:50 +01:00
block_dev.c [PATCH 1/2] kill FMODE_NDELAY_NOW 2008-12-04 04:22:57 -05:00
buffer.c block: Supress Buffer I/O errors when SCSI REQ_QUIET flag set 2008-12-29 08:28:44 +01:00
char_dev.c [PATCH] tidy up chrdev_open 2008-10-23 05:12:59 -04:00
compat.c CRED: Make execve() take advantage of copy-on-write credentials 2008-11-14 10:39:24 +11:00
compat_binfmt_elf.c
…
compat_ioctl.c remove unused #include <linux/dirent.h>'s 2008-07-25 10:53:34 -07:00
dcache.c [PATCH] fs: add a sanity check in d_free 2008-10-23 05:17:12 -04:00
dcookies.c d_path: Make d_path() use a struct path 2008-02-14 21:17:09 -08:00
direct-io.c Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00
dnotify.c [PATCH] split linux/file.h 2008-05-01 13:08:16 -04:00
dquot.c CRED: Wrap task credential accesses in the filesystem subsystem 2008-11-14 10:39:05 +11:00
drop_caches.c vfs: skip inodes without pages to free in drop_pagecache_sb() 2008-04-29 08:06:05 -07:00
eventfd.c flag parameters: check magic constants 2008-07-24 10:47:29 -07:00
eventpoll.c epoll: introduce resource usage limits 2008-12-01 19:55:24 -08:00
exec.c Merge branch 'next' into for-linus 2008-12-25 11:40:09 +11:00
fcntl.c Merge branch 'next' into for-linus 2008-12-25 11:40:09 +11:00
fifo.c [PATCH] introduce fmode_t, do annotations 2008-10-21 07:47:06 -04:00
file.c [PATCH] merge locate_fd() and get_unused_fd() 2008-08-01 11:25:23 -04:00
file_table.c CRED: Use creds in file structs 2008-11-14 10:39:25 +11:00
filesystems.c proc: move /proc/filesystems to fs/filesystems.c 2008-10-23 14:27:09 +04:00
fs-writeback.c Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00
generic_acl.c
…
inode.c fs/inode.c: properly init address_space->writeback_index 2008-08-15 08:35:44 -07:00
inotify.c inotify: fix IN_ONESHOT unmount event watcher 2008-12-10 08:01:53 -08:00
inotify_user.c CRED: Wrap task credential accesses in the filesystem subsystem 2008-11-14 10:39:05 +11:00
internal.h CRED: Make execve() take advantage of copy-on-write credentials 2008-11-14 10:39:24 +11:00
ioctl.c Fix a race condition in FASYNC handling 2008-12-05 15:35:10 -08:00
ioprio.c CRED: Use RCU to access another task's creds and to release a task's own creds 2008-11-14 10:39:19 +11:00
libfs.c fs: remove prepare_write/commit_write 2008-10-30 11:38:45 -07:00
locks.c CRED: Wrap task credential accesses in the filesystem subsystem 2008-11-14 10:39:05 +11:00
mbcache.c vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs 2008-04-15 19:35:41 -07:00
mpage.c Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00
namei.c Merge branch 'master' into next 2008-12-04 17:16:36 +11:00
namespace.c Merge branch 'master' into next 2008-11-14 11:29:12 +11:00
nfsctl.c nfsctl: add headers for credentials 2008-11-20 08:11:55 +11:00
no-block.c
…
open.c CRED: Inaugurate COW credentials 2008-11-14 10:39:23 +11:00
pipe.c CRED: Wrap task credential accesses in the filesystem subsystem 2008-11-14 10:39:05 +11:00
pnode.c [patch 7/7] vfs: mountinfo: show dominating group id 2008-04-23 00:05:09 -04:00
pnode.h [patch 7/7] vfs: mountinfo: show dominating group id 2008-04-23 00:05:09 -04:00
posix_acl.c CRED: Wrap task credential accesses in the filesystem subsystem 2008-11-14 10:39:05 +11:00
quota.c CRED: Wrap task credential accesses in the filesystem subsystem 2008-11-14 10:39:05 +11:00
quota_v1.c quota: move function-macros from quota.h to quotaops.h 2008-07-25 10:53:35 -07:00
quota_v2.c quota: move function-macros from quota.h to quotaops.h 2008-07-25 10:53:35 -07:00
read_write.c [PATCH] generic_file_llseek tidyups 2008-10-23 05:12:59 -04:00
read_write.h
…
readdir.c [PATCH] prepare vfs_readdir() callers to returning filldir result 2008-10-23 05:13:10 -04:00
select.c select: deal with math overflow from borderline valid userland data 2008-10-26 11:22:08 -07:00
seq_file.c vfs, seqfile: export mangle_path() generally 2008-11-28 18:07:10 +01:00
signalfd.c flag parameters: check magic constants 2008-07-24 10:47:29 -07:00
splice.c fs: remove prepare_write/commit_write 2008-10-30 11:38:45 -07:00
stack.c
…
stat.c [PATCH] sanitize __user_walk_fd() et.al. 2008-07-26 20:53:34 -04:00
super.c security: pass mount flags to security_sb_kern_mount() 2008-12-20 09:02:39 +11:00
sync.c SYNC_FILE_RANGE_WRITE may and will block. Document that. 2008-07-24 10:47:17 -07:00
timerfd.c hrtimer: convert timerfd to the new hrtimer apis 2008-09-05 21:35:09 -07:00
utimes.c [PATCH] sanitize __user_walk_fd() et.al. 2008-07-26 20:53:34 -04:00
xattr.c [PATCH] sanitize __user_walk_fd() et.al. 2008-07-26 20:53:34 -04:00
xattr_acl.c
…