Al Viro 84e710da2a parallel lookups machinery, part 2 ... We'll need to verify that there's neither a hashed nor in-lookup dentry with desired parent/name before adding to in-lookup set. One possible solution would be to hold the parent's ->d_lock through both checks, but while the in-lookup set is relatively small at any time, dcache is not. And holding the parent's ->d_lock through something like __d_lookup_rcu() would suck too badly. So we leave the parent's ->d_lock alone, which means that we watch out for the following scenario: * we verify that there's no hashed match * existing in-lookup match gets hashed by another process * we verify that there's no in-lookup matches and decide that everything's fine. Solution: per-directory kinda-sorta seqlock, bumped around the times we hash something that used to be in-lookup or move (and hash) something in place of in-lookup. Then the above would turn into * read the counter * do dcache lookup * if no matches found, check for in-lookup matches * if there had been none of those either, check if the counter has changed; repeat if it has. The "kinda-sorta" part is due to the fact that we don't have much spare space in inode. There is a spare word (shared with i_bdev/i_cdev/i_pipe), so the counter part is not a problem, but spinlock is a different story. We could use the parent's ->d_lock, and it would be less painful in terms of contention, for __d_add() it would be rather inconvenient to grab; we could do that (using lock_parent()), but... Fortunately, we can get serialization on the counter itself, and it might be a good idea in general; we can use cmpxchg() in a loop to get from even to odd and smp_store_release() from odd to even. This commit adds the counter and updating logics; the readers will be added in the next commit. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>		2016-05-02 19:49:26 -04:00
..
9p	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
adfs	fs/adfs/adfs.h: tidy up comments	2016-01-20 17:09:18 -08:00
affs	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
afs	make ext2_get_page() and friends work without external serialization	2016-05-02 19:47:25 -04:00
autofs4	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-03-19 18:52:29 -07:00
befs
bfs
btrfs	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
cachefiles	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
ceph	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
cifs	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
coda	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-01-23 12:24:56 -08:00
configfs	configfs_detach_prep(): make sure that wait_mutex won't go away	2016-05-02 19:47:22 -04:00
cramfs	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
crypto	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
debugfs	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
devpts	pty: make sure super_block is still valid in final /dev/tty close	2016-02-06 23:45:46 -08:00
dlm	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
ecryptfs	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
efivarfs	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
efs	don't bother with ->d_inode->i_sb - it's always equal to ->d_sb	2016-04-10 17:11:51 -04:00
exofs	make ext2_get_page() and friends work without external serialization	2016-05-02 19:47:25 -04:00
exportfs	reconnect_one(): use lookup_one_len_unlocked()	2016-05-02 19:47:24 -04:00
ext2	make ext2_get_page() and friends work without external serialization	2016-05-02 19:47:25 -04:00
ext4	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
f2fs	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
fat	fat: add config option to set UTF-8 mount option by default	2016-03-22 15:36:02 -07:00
freevxfs	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
fscache	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
fuse	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
gfs2	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
hfs	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
hfsplus	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
hostfs	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
hpfs	hpfs: don't truncate the file when delete fails	2016-02-27 19:15:51 -05:00
hugetlbfs	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
isofs	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
jbd2	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
jffs2	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
jfs	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
kernfs	kernfs: use lookup_one_len_unlocked()	2016-05-02 19:47:21 -04:00
lockd	lockd: constify nlmsvc_binding structure	2016-01-07 10:10:50 -05:00
logfs	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
minix	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
ncpfs	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
nfs	nfs: missing wakeup in nfs_unblock_sillyrename()	2016-05-02 19:47:25 -04:00
nfs_common
nfsd	don't bother with ->d_inode->i_sb - it's always equal to ->d_sb	2016-04-10 17:11:51 -04:00
nilfs2	make ext2_get_page() and friends work without external serialization	2016-05-02 19:47:25 -04:00
nls
notify	fsnotify: turn fsnotify reaper thread into a workqueue job	2016-02-18 16:23:24 -08:00
ntfs	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
ocfs2	ocfs2: don't open-code inode_lock/inode_unlock	2016-05-02 19:47:22 -04:00
omfs	omfs: fix potential integer overflow in allocator	2015-05-28 18:25:19 -07:00
openpromfs
orangefs	orangefs: don't open-code inode_lock/inode_unlock	2016-05-02 19:47:23 -04:00
overlayfs	ovl_lookup_real(): use lookup_one_len_unlocked()	2016-05-02 19:47:24 -04:00
proc	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
pstore	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
qnx4
qnx6	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
quota	quota: Handle Q_GETNEXTQUOTA when quota is disabled	2016-03-29 17:20:10 +02:00
ramfs	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
reiserfs	reiserfs: open-code reiserfs_mutex_lock_safe() in reiserfs_unpack()	2016-05-02 19:47:23 -04:00
romfs	kmemcg: account certain kmem allocations to memcg	2016-01-14 16:00:49 -08:00
squashfs	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
sysfs
sysv	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
tracefs	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
ubifs	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
udf	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
ufs	make ext2_get_page() and friends work without external serialization	2016-05-02 19:47:25 -04:00
xfs	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
aio.c
anon_inodes.c
attr.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
bad_inode.c	->getxattr(): pass dentry and inode as separate arguments	2016-04-11 00:48:00 -04:00
binfmt_aout.c
binfmt_elf.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
binfmt_elf_fdpic.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
binfmt_script.c
block_dev.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
buffer.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
char_dev.c
compat.c
compat_binfmt_elf.c	binfmt_elf: add ELF_HWCAP2 to compat auxv entries	2014-03-04 08:05:21 +00:00
compat_ioctl.c	Merge 4.5-rc4 into char-misc-next	2016-02-14 14:25:59 -08:00
coredump.c	fs/coredump: prevent fsuid=0 dumps into user-controlled directories	2016-03-22 15:36:02 -07:00
dax.c	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
dcache.c	parallel lookups machinery, part 2	2016-05-02 19:49:26 -04:00
dcookies.c
direct-io.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
drop_caches.c
eventfd.c	eventfd: document lockless access in eventfd_poll	2016-03-22 15:36:02 -07:00
eventpoll.c	timer: convert timer_slack_ns from unsigned long to u64	2016-03-17 15:09:34 -07:00
exec.c	Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2016-03-20 19:08:56 -07:00
fcntl.c	fcntl: allow to set O_DIRECT flag on pipe	2016-01-09 02:55:37 -05:00
fhandle.c	fs/coredump: prevent fsuid=0 dumps into user-controlled directories	2016-03-22 15:36:02 -07:00
file.c
file_table.c
filesystems.c	find_filesystem(): simplify comparison	2016-01-19 12:02:23 -05:00
fs-writeback.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
fs_pin.c
fs_struct.c
inode.c	parallel lookups machinery, part 2	2016-05-02 19:49:26 -04:00
internal.h
ioctl.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
Kconfig	Merge tag 'ofs-pull-tag-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux	2016-03-26 12:59:04 -07:00
Kconfig.binfmt	mm: split ET_DYN ASLR from mmap ASLR	2015-04-14 16:49:05 -07:00
libfs.c	Merge getxattr prototype change into work.lookups	2016-05-02 19:45:47 -04:00
locks.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
Makefile	Merge tag 'ofs-pull-tag-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux	2016-03-26 12:59:04 -07:00
mbcache.c	mbcache: add reusable flag to cache entries	2016-02-22 22:44:04 -05:00
mount.h
mpage.c	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
namei.c	beginning of transition to parallel lookups - marking in-lookup dentries	2016-05-02 19:47:51 -04:00
namespace.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
no-block.c
nsfs.c
open.c	fs/coredump: prevent fsuid=0 dumps into user-controlled directories	2016-03-22 15:36:02 -07:00
pipe.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
pnode.c	fs/pnode.c: treat zero mnt_group_id-s as unequal	2016-02-20 00:15:52 -05:00
pnode.h
posix_acl.c	xattr_handler: pass dentry and inode as separate arguments of ->get()	2016-04-10 20:48:24 -04:00
proc_namespace.c	vfs: show_vfsstat: do not ignore errors from show_devname method	2016-03-16 13:09:08 -04:00
read_write.c	Merge branches 'work.lookups', 'work.misc' and 'work.preadv2' into for-next	2016-03-18 16:07:38 -04:00
readdir.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
select.c	timer: convert timer_slack_ns from unsigned long to u64	2016-03-17 15:09:34 -07:00
seq_file.c
signalfd.c
splice.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
stack.c
stat.c
statfs.c	vfs: allow O_PATH file descriptors for fstatfs()	2013-10-12 13:12:31 -07:00
super.c	writeback: flush inode cgroup wb switches instead of pinning super_block	2016-03-03 14:42:50 -07:00
sync.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
timerfd.c
userfaultfd.c	userfaultfd: don't block on the last VM updates at exit time	2016-03-02 09:03:18 -08:00
utimes.c	wrappers for ->i_mutex access	2016-01-22 18:04:28 -05:00
xattr.c	->getxattr(): pass dentry and inode as separate arguments	2016-04-11 00:48:00 -04:00