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Vladimir Davydov 3f97b16320 list_lru: add helpers to isolate items 
Currently, the isolate callback passed to the list_lru_walk family of
functions is supposed to just delete an item from the list upon returning
LRU_REMOVED or LRU_REMOVED_RETRY, while nr_items counter is fixed by
__list_lru_walk_one after the callback returns.  Since the callback is
allowed to drop the lock after removing an item (it has to return
LRU_REMOVED_RETRY then), the nr_items can be less than the actual number
of elements on the list even if we check them under the lock.  This makes
it difficult to move items from one list_lru_one to another, which is
required for per-memcg list_lru reparenting - we can't just splice the
lists, we have to move entries one by one.

This patch therefore introduces helpers that must be used by callback
functions to isolate items instead of raw list_del/list_move.  These are
list_lru_isolate and list_lru_isolate_move.  They not only remove the
entry from the list, but also fix the nr_items counter, making sure
nr_items always reflects the actual number of elements on the list if
checked under the appropriate lock.

Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2015-02-12 18:54:10 -08:00
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9p mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub 2015-02-10 14:30:30 -08:00
adfs
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affs fs/affs/file.c: remove obsolete pagesize check 2014-12-13 12:42:52 -08:00
afs rxrpc: make the users of rxrpc_kernel_send_data() set kvec-backed msg_iter properly 2015-02-04 01:34:14 -05:00
autofs4 assorted conversions to %p[dD] 2014-11-19 13:01:20 -05:00
befs befs: remove dead code 2014-12-13 12:42:51 -08:00
bfs
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btrfs page_writeback: put account_page_redirty() after set_page_dirty() 2015-02-11 17:06:04 -08:00
cachefiles assorted conversions to %p[dD] 2014-11-19 13:01:20 -05:00
ceph Merge branch 'akpm' (patches from Andrew) 2015-02-10 16:45:56 -08:00
cifs Merge branch 'akpm' (patches from Andrew) 2015-02-10 16:45:56 -08:00
coda coda_venus_readdir(): use file_inode() 2014-12-11 16:28:12 -05:00
configfs assorted conversions to %p[dD] 2014-11-19 13:01:20 -05:00
cramfs
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debugfs Driver core patches for 3.19-rc1 2014-12-14 16:10:09 -08:00
devpts
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dlm netlink: make nlmsg_end() and genlmsg_end() void 2015-01-18 01:03:45 -05:00
ecryptfs Fixes for filename decryption and encrypted view plus a cleanup 2014-12-19 18:15:12 -08:00
efivarfs * Move efivarfs from the misc filesystem section to pseudo filesystem, 2015-01-29 19:16:40 +01:00
efs
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exofs Boaz Harrosh - Fix broken email address 2014-10-19 20:22:32 +03:00
exportfs move d_rcu from overlapping d_child to overlapping d_alias 2014-11-03 15:20:29 -05:00
ext2 ext2: Convert to private i_dquot field 2014-11-10 10:06:10 +01:00
ext3 ext3: destroy sbi mutexes in put_super 2015-01-05 11:13:55 +01:00
ext4 Merge branch 'akpm' (patches from Andrew) 2015-02-10 16:45:56 -08:00
f2fs mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub 2015-02-10 14:30:30 -08:00
fat fat: fix data past EOF resulting from fsx testsuite 2014-12-13 12:42:51 -08:00
freevxfs
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fscache
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fuse mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub 2015-02-10 14:30:30 -08:00
gfs2 list_lru: add helpers to isolate items 2015-02-12 18:54:10 -08:00
hfs fs/hfs/catalog.c: fix comparison bug in hfs_cat_keycmp 2014-12-10 17:41:16 -08:00
hfsplus hfsplus: fix longname handling 2014-12-18 19:08:10 -08:00
hostfs
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hpfs
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hppfs vfs: make first argument of dir_context.actor typed 2014-10-31 17:48:54 -04:00
hugetlbfs mm: convert i_mmap_mutex to rwsem 2014-12-13 12:42:45 -08:00
isofs isofs: Fix bug in the way to check if the year is a leap year 2015-01-07 09:51:49 +01:00
jbd jbd: Deletion of an unnecessary check before the function call "iput" 2014-11-18 10:15:29 +01:00
jbd2 Lots of bugs fixes, including Zheng and Jan's extent status shrinker 2014-12-12 09:28:03 -08:00
jffs2 jffs2: Drop bogus if in comment 2014-11-28 18:23:44 -08:00
jfs jfs: Deletion of an unnecessary check before the function call "unload_nls" 2015-02-02 15:02:34 -06:00
kernfs kernfs: Fix kernfs_name_compare 2015-01-09 15:51:08 -08:00
lockd Merge branch 'for-3.20' of git://linux-nfs.org/~bfields/linux 2015-02-12 10:39:41 -08:00
logfs
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minix
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ncpfs Merge branch 'akpm' (patchbomb from Andrew) 2014-12-10 18:34:42 -08:00
nfs NFS client updates for Linux 3.20 2015-02-11 17:14:54 -08:00
nfs_common
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nfsd nfsd: default NFSv4.2 to on 2015-02-09 14:58:50 -05:00
nilfs2 mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub 2015-02-10 14:30:30 -08:00
nls
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notify fanotify: don't set FAN_ONDIR implicitly on a marks ignored mask 2015-02-10 14:30:28 -08:00
ntfs assorted conversions to %p[dD] 2014-11-19 13:01:20 -05:00
ocfs2 Merge branch 'akpm' (patches from Andrew) 2015-02-10 16:45:56 -08:00
omfs
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openpromfs
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overlayfs Merge branch 'iov_iter' into for-next 2014-12-08 20:39:29 -05:00
proc mm: /proc/pid/clear_refs: avoid split_huge_page() 2015-02-11 17:06:06 -08:00
pstore pstore: Fix sprintf format specifier in pstore_dump() 2015-01-16 16:01:29 -08:00
qnx4
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qnx6
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quota Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2015-02-10 15:52:38 -08:00
ramfs
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reiserfs Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2014-12-16 15:46:01 -08:00
romfs
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squashfs Squashfs: Add LZ4 compression configuration option 2014-11-27 18:48:44 +00:00
sysfs sysfs/kernfs: make read requests on pre-alloc files use the buffer. 2014-11-07 10:54:38 -08:00
sysv
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ubifs mm: drop vm_ops->remap_pages and generic_file_remap_pages() stub 2015-02-10 14:30:30 -08:00
udf udf: remove bool assignment to 0/1 2015-02-05 16:34:25 +01:00
ufs
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xfs list_lru: add helpers to isolate items 2015-02-12 18:54:10 -08:00
Kconfig fs: Make efivarfs a pseudo filesystem, built by default with EFI 2015-01-05 14:15:58 +00:00
Kconfig.binfmt binfmt_elf: allow arch code to examine PT_LOPROC ... PT_HIPROC headers 2014-11-24 07:45:02 +01:00
Makefile Merge branch 'nsfs' into for-next 2014-12-10 21:31:59 -05:00
aio.c aio: annotate aio_read_event_ring for sleep patterns 2015-02-03 19:29:05 -05:00
anon_inodes.c
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attr.c
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bad_inode.c
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binfmt_aout.c assorted conversions to %p[dD] 2014-11-19 13:01:20 -05:00
binfmt_elf.c Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-12-11 17:56:37 -08:00
binfmt_elf_fdpic.c
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binfmt_em86.c syscalls: implement execveat() system call 2014-12-13 12:42:51 -08:00
binfmt_flat.c
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binfmt_misc.c unfuck binfmt_misc.c (broken by commit e6084d4) 2014-12-17 08:27:14 -05:00
binfmt_script.c syscalls: implement execveat() system call 2014-12-13 12:42:51 -08:00
binfmt_som.c
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block_dev.c fs: add freeze_super/thaw_super fs hooks 2014-11-17 10:35:17 +00:00
buffer.c fs: clarify rate limit suppressed buffer I/O errors 2014-10-21 13:55:11 -06:00
char_dev.c fs/char_dev.c: remove pointless assignment from __register_chrdev_region() 2014-12-10 17:41:04 -08:00
compat.c vfs: make first argument of dir_context.actor typed 2014-10-31 17:48:54 -04:00
compat_binfmt_elf.c
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compat_ioctl.c
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coredump.c
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dcache.c list_lru: add helpers to isolate items 2015-02-12 18:54:10 -08:00
dcookies.c
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direct-io.c
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drop_caches.c vmscan: per memory cgroup slab shrinkers 2015-02-12 18:54:09 -08:00
eventfd.c fs: Convert show_fdinfo functions to void 2014-11-05 14:13:23 -05:00
eventpoll.c fs: Convert show_fdinfo functions to void 2014-11-05 14:13:23 -05:00
exec.c syscalls: implement execveat() system call 2014-12-13 12:42:51 -08:00
fcntl.c vfs: renumber FMODE_NONOTIFY and add to uniqueness check 2015-01-08 15:10:52 -08:00
fhandle.c
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file.c fs/file.c: replace get_unused_fd() with get_unused_fd_flags(0) 2014-12-10 17:41:10 -08:00
file_table.c
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filesystems.c
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fs-writeback.c writeback: fix a subtle race condition in I_DIRTY clearing 2014-11-04 10:42:23 -07:00
fs_pin.c
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fs_struct.c
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inode.c list_lru: add helpers to isolate items 2015-02-12 18:54:10 -08:00
internal.h list_lru: introduce list_lru_shrink_{count,walk} 2015-02-12 18:54:08 -08:00
ioctl.c fsioctl.c: make generic_block_fiemap() signal-tolerant 2015-02-10 14:30:30 -08:00
libfs.c move d_rcu from overlapping d_child to overlapping d_alias 2014-11-03 15:20:29 -05:00
locks.c fs: add FL_LAYOUT lease type 2015-02-02 18:09:38 +01:00
mbcache.c
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mount.h common object embedded into various struct ....ns 2014-12-04 14:31:00 -05:00
mpage.c
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namei.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-12-16 15:53:03 -08:00
namespace.c mnt: Fix a memory stomp in umount 2014-12-18 11:22:02 -08:00
no-block.c
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nsfs.c take the targets of /proc/*/ns/* symlinks to separate fs 2014-12-10 21:30:20 -05:00
open.c Merge branch 'for-3.19' of git://linux-nfs.org/~bfields/linux 2014-12-16 15:25:31 -08:00
pipe.c
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pnode.c mnt: Move the clear of MNT_LOCKED from copy_tree to it's callers. 2014-12-02 10:46:50 -06:00
pnode.h
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posix_acl.c
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proc_namespace.c vfs: make mounts and mountstats honor root dir like mountinfo does 2014-12-17 08:27:15 -05:00
read_write.c locks: convert posix locks to file_lock_context 2015-01-16 16:08:16 -05:00
readdir.c vfs: make first argument of dir_context.actor typed 2014-10-31 17:48:54 -04:00
select.c
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seq_file.c fs, seq_file: fallback to vmalloc instead of oom kill processes 2014-12-13 12:42:49 -08:00
signalfd.c fs: Convert show_fdinfo functions to void 2014-11-05 14:13:23 -05:00
splice.c vfs: export do_splice_direct() to modules 2014-10-24 00:14:35 +02:00
stack.c
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stat.c
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statfs.c
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super.c fs: shrinker: always scan at least one object of each type 2015-02-12 18:54:09 -08:00
sync.c kill f_dentry uses 2014-11-19 13:01:25 -05:00
timerfd.c fs: Convert show_fdinfo functions to void 2014-11-05 14:13:23 -05:00
utimes.c
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xattr.c new helper: audit_file() 2014-11-19 13:01:26 -05:00