Vladimir Davydov 3cb29d1117 cleancache: remove limit on the number of cleancache enabled filesystems ... The limit equals 32 and is imposed by the number of entries in the fs_poolid_map and shared_fs_poolid_map. Nowadays it is insufficient, because with containers on board a Linux host can have hundreds of active fs mounts. These maps were introduced by commit 49a9ab815a ("mm: cleancache: lazy initialization to allow tmem backends to build/run as modules") in order to allow compiling cleancache drivers as modules. Real pool ids are stored in these maps while super_block->cleancache_poolid points to an entry in the map, so that on cleancache registration we can walk over all (if there are <= 32 of them, of course) cleancache-enabled super blocks and assign real pool ids. Actually, there is absolutely no need in these maps, because we can iterate over all super blocks immediately using iterate_supers. This is not racy, because cleancache_init_ops is called from mount_fs with super_block->s_umount held for writing, while iterate_supers takes this semaphore for reading, so if we call iterate_supers after setting cleancache_ops, all super blocks that had been created before cleancache_register_ops was called will be assigned pool ids by the action function of iterate_supers while all newer super blocks will receive it in cleancache_init_fs. This patch therefore removes the maps and hence the artificial limit on the number of cleancache enabled filesystems. Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Stefan Hengelein <ilendir@googlemail.com> Cc: Florian Schmaus <fschmaus@gmail.com> Cc: Andor Daam <andor.daam@googlemail.com> Cc: Dan Magenheimer <dan.magenheimer@oracle.com> Cc: Bob Liu <lliubbo@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2015-04-14 16:49:03 -07:00
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9p
adfs
affs
afs
autofs4
befs
bfs
btrfs
cachefiles
ceph
cifs
coda
configfs
cramfs
debugfs	debugfs: allow bad parent pointers to be passed in	2015-04-03 16:30:12 +02:00
devpts
dlm
ecryptfs
efivarfs
efs
exofs
exportfs
ext2
ext3
ext4
f2fs
fat
freevxfs
fscache
fuse
gfs2
hfs
hfsplus
hostfs
hpfs
hppfs
hugetlbfs	page_writeback: clean up mess around cancel_dirty_page()	2015-04-14 16:49:01 -07:00
isofs
jbd
jbd2
jffs2
jfs
kernfs
lockd
logfs
minix
ncpfs
nfs	page_writeback: clean up mess around cancel_dirty_page()	2015-04-14 16:49:01 -07:00
nfs_common
nfsd
nilfs2
nls
notify
ntfs
ocfs2	cleancache: zap uuid arg of cleancache_init_shared_fs	2015-04-14 16:49:03 -07:00
omfs
openpromfs
overlayfs
proc
pstore
qnx4
qnx6
quota
ramfs
reiserfs
romfs
squashfs
sysfs
sysv
ubifs
udf
ufs
xfs
aio.c	ioctx_alloc(): fix vma (and file) leak on failure	2015-04-06 17:57:44 -04:00
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c
binfmt_elf.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
block_dev.c
buffer.c	page_writeback: clean up mess around cancel_dirty_page()	2015-04-14 16:49:01 -07:00
char_dev.c
compat_binfmt_elf.c
compat_ioctl.c
compat.c
coredump.c
dax.c
dcache.c
dcookies.c
direct-io.c
drop_caches.c
eventfd.c
eventpoll.c
exec.c
fcntl.c
fhandle.c
file_table.c
file.c
filesystems.c
fs_pin.c
fs_struct.c
fs-writeback.c
inode.c
internal.h
ioctl.c
Kconfig
Kconfig.binfmt
libfs.c
locks.c
Makefile
mbcache.c
mount.h
mpage.c
namei.c
namespace.c
no-block.c
nsfs.c
open.c
pipe.c
pnode.c
pnode.h
posix_acl.c
proc_namespace.c
read_write.c
readdir.c
select.c
seq_file.c
signalfd.c
splice.c
stack.c
stat.c
statfs.c
super.c	cleancache: remove limit on the number of cleancache enabled filesystems	2015-04-14 16:49:03 -07:00
sync.c
timerfd.c
utimes.c
xattr.c