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Tejun Heo 2aad2a86f6 percpu_ref: add PERCPU_REF_INIT_* flags 
With the recent addition of percpu_ref_reinit(), percpu_ref now can be
used as a persistent switch which can be turned on and off repeatedly
where turning off maps to killing the ref and waiting for it to drain;
however, there currently isn't a way to initialize a percpu_ref in its
off (killed and drained) state, which can be inconvenient for certain
persistent switch use cases.

Similarly, percpu_ref_switch_to_atomic/percpu() allow dynamic
selection of operation mode; however, currently a newly initialized
percpu_ref is always in percpu mode making it impossible to avoid the
latency overhead of switching to atomic mode.

This patch adds @flags to percpu_ref_init() and implements the
following flags.

* PERCPU_REF_INIT_ATOMIC	: start ref in atomic mode
* PERCPU_REF_INIT_DEAD		: start ref killed and drained

These flags should be able to serve the above two use cases.

v2: target_core_tpg.c conversion was missing.  Fixed.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
 		2014-09-24 13:31:50 -04:00
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9p
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adfs adfs: add __printf verification, fix format/argument mismatches 2014-08-08 15:57:24 -07:00
affs
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afs
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autofs4 autofs4: comment typo: remove a a doubled word 2014-08-08 15:57:19 -07:00
befs fs/befs/linuxvfs.c: check superblock before dump operation 2014-08-08 15:57:20 -07:00
bfs fs/bfs: use bfs prefix for dump_imap 2014-08-08 15:57:24 -07:00
btrfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block into for-3.18 2014-09-24 13:00:21 -04:00
cachefiles CacheFiles: Handle rename2 2014-09-17 23:29:53 +01:00
ceph Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2014-08-13 17:43:29 -06:00
cifs Fix mfsymlinks file size check 2014-09-16 06:48:20 -05:00
coda fs/coda: use linux/uaccess.h 2014-08-08 15:57:20 -07:00
configfs
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cramfs fs/cramfs/inode.c: use linux/uaccess.h 2014-08-08 15:57:25 -07:00
debugfs
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devpts
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dlm fs/dlm/debug_fs.c: remove unnecessary null test before debugfs_remove 2014-08-08 15:57:27 -07:00
ecryptfs
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efivarfs
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efs fs/efs/namei.c: return is not a function 2014-08-08 15:57:18 -07:00
exofs fs/exofs/ore_raid.c: replace count*size kzalloc by kcalloc 2014-08-08 15:57:24 -07:00
exportfs
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ext2 percpu_counter: add @gfp to percpu_counter_init() 2014-09-08 09:51:29 +09:00
ext3 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block into for-3.18 2014-09-24 13:00:21 -04:00
ext4 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block into for-3.18 2014-09-24 13:00:21 -04:00
f2fs f2fs: reposition unlock_new_inode to prevent accessing invalid inode 2014-09-02 00:22:24 -07:00
fat
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freevxfs
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fscache FS-Cache: refcount becomes corrupt under vma pressure. 2014-09-17 22:41:40 +01:00
fuse switch iov_iter_get_pages() to passing maximal number of pages 2014-08-07 14:40:11 -04:00
gfs2 GFS2: fix d_splice_alias() misuses 2014-09-12 20:58:55 +01:00
hfs
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hfsplus
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hostfs hostfs: support rename flags 2014-08-07 14:40:09 -04:00
hpfs fs/hpfs/dnode.c: fix suspect code indent 2014-08-08 15:57:22 -07:00
hppfs
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hugetlbfs
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isofs isofs: Fix unbounded recursion when processing relocated directories 2014-08-19 18:29:30 +02:00
jbd
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jbd2 jbd2: fix descriptor block size handling errors with journal_csum 2014-08-28 22:22:29 -04:00
jffs2 MTD updates for 3.17-rc1 2014-08-08 18:13:21 -07:00
jfs
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kernfs
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lockd lockd: fix rpcbind crash on lockd startup failure 2014-09-08 12:03:32 -04:00
logfs fs/logfs/readwrite.c: kernel-doc warning fixes 2014-08-06 18:01:12 -07:00
minix minix zmap block counts calculation fix 2014-08-08 15:57:20 -07:00
ncpfs
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nfs NFSv4: Fix another bug in the close/open_downgrade code 2014-09-18 13:04:22 -04:00
nfs_common
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nfsd nfsd4: fix rd_dircount enforcement 2014-09-08 12:02:03 -04:00
nilfs2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-08-11 11:44:11 -07:00
nls
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notify fs/notify: don't show f_handle if exportfs_encode_inode_fh failed 2014-09-10 15:42:12 -07:00
ntfs ntfs: kernel-doc warning fixes 2014-08-06 18:01:12 -07:00
ocfs2 ocfs2: quorum: add a log for node not fenced 2014-08-29 16:28:17 -07:00
omfs fs/omfs/inode.c: replace count*size kzalloc by kcalloc 2014-08-08 15:57:25 -07:00
openpromfs
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proc Revert "proc: Point /proc/{mounts,net} at /proc/thread-self/{mounts,net} instead of /proc/self/{mounts,net}" 2014-08-10 21:24:59 -07:00
pstore fs/pstore/ram_core.c: replace count*size kmalloc by kmalloc_array 2014-08-08 15:57:25 -07:00
qnx4
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qnx6 fs/qnx6: update debugging to current functions 2014-08-08 15:57:26 -07:00
quota percpu_counter: add @gfp to percpu_counter_init() 2014-09-08 09:51:29 +09:00
ramfs fs/ramfs/file-nommu.c: replace count*size kzalloc by kcalloc 2014-08-08 15:57:18 -07:00
reiserfs Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2014-08-13 17:45:40 -06:00
romfs fs/romfs/super.c: add blank line after declarations 2014-08-08 15:57:25 -07:00
squashfs fs/squashfs/super.c: logging cleanup 2014-08-06 18:01:13 -07:00
sysfs
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sysv
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ubifs
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udf udf: saner calling conventions for udf_new_inode() 2014-09-04 21:37:41 +02:00
ufs ufs: fix deadlocks introduced by sb mutex merge 2014-09-07 13:26:39 -04:00
xfs xfs: trim eofblocks before collapse range 2014-09-02 12:12:53 +10:00
Kconfig
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Kconfig.binfmt
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Makefile take fs_pin stuff to fs/* 2014-08-07 14:40:08 -04:00
aio.c percpu_ref: add PERCPU_REF_INIT_* flags 2014-09-24 13:31:50 -04:00
anon_inodes.c
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attr.c
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bad_inode.c bad_inode: add ->rename2() 2014-08-07 14:40:09 -04:00
binfmt_aout.c
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binfmt_elf.c
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binfmt_elf_fdpic.c
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binfmt_em86.c
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binfmt_flat.c
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binfmt_misc.c
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binfmt_script.c
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binfmt_som.c
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block_dev.c
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buffer.c Fix nasty 32-bit overflow bug in buffer i/o code. 2014-09-22 08:41:16 -07:00
char_dev.c
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compat.c
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compat_binfmt_elf.c
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compat_ioctl.c
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coredump.c
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dcache.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-09-14 17:37:36 -07:00
dcookies.c
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direct-io.c switch iov_iter_get_pages() to passing maximal number of pages 2014-08-07 14:40:11 -04:00
drop_caches.c
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eventfd.c
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eventpoll.c eventpoll: fix uninitialized variable in epoll_ctl 2014-09-10 15:42:12 -07:00
exec.c fork/exec: cleanup mm initialization 2014-08-08 15:57:23 -07:00
fcntl.c shm: add sealing API 2014-08-08 15:57:31 -07:00
fhandle.c
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file.c
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file_table.c percpu_counter: add @gfp to percpu_counter_init() 2014-09-08 09:51:29 +09:00
filesystems.c
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fs-writeback.c
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fs_pin.c make fs/{namespace,super}.c forget about acct.h 2014-08-07 14:40:09 -04:00
fs_struct.c
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inode.c mm: allow drivers to prevent new writable mappings 2014-08-08 15:57:31 -07:00
internal.h make fs/{namespace,super}.c forget about acct.h 2014-08-07 14:40:09 -04:00
ioctl.c
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libfs.c
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locks.c locks: pass correct "before" pointer to locks_unlink_lock in generic_add_lease 2014-08-22 09:58:22 -04:00
mbcache.c
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mount.h death to mnt_pinned 2014-08-07 14:40:09 -04:00
mpage.c
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namei.c vfs: workaround gcc <4.6 build error in link_path_walk() 2014-09-16 07:44:54 -07:00
namespace.c fix EBUSY on umount() from MNT_SHRINKABLE 2014-08-30 18:32:05 -04:00
no-block.c
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open.c
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pipe.c
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pnode.c get rid of propagate_umount() mistakenly treating slaves as busy. 2014-08-30 18:31:41 -04:00
pnode.h
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posix_acl.c
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proc_namespace.c
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read_write.c
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readdir.c
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select.c
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seq_file.c
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signalfd.c
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splice.c
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stack.c
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stat.c
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statfs.c
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super.c percpu_counter: add @gfp to percpu_counter_init() 2014-09-08 09:51:29 +09:00
sync.c Export sync_filesystem() for modular ->remount_fs() use 2014-09-05 08:16:21 -07:00
timerfd.c
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utimes.c
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xattr.c
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