Tejun Heo 852c788f83 block: implement bio_associate_current() ... IO scheduling and cgroup are tied to the issuing task via io_context and cgroup of %current. Unfortunately, there are cases where IOs need to be routed via a different task which makes scheduling and cgroup limit enforcement applied completely incorrectly. For example, all bios delayed by blk-throttle end up being issued by a delayed work item and get assigned the io_context of the worker task which happens to serve the work item and dumped to the default block cgroup. This is double confusing as bios which aren't delayed end up in the correct cgroup and makes using blk-throttle and cfq propio together impossible. Any code which punts IO issuing to another task is affected which is getting more and more common (e.g. btrfs). As both io_context and cgroup are firmly tied to task including userland visible APIs to manipulate them, it makes a lot of sense to match up tasks to bios. This patch implements bio_associate_current() which associates the specified bio with %current. The bio will record the associated ioc and blkcg at that point and block layer will use the recorded ones regardless of which task actually ends up issuing the bio. bio release puts the associated ioc and blkcg. It grabs and remembers ioc and blkcg instead of the task itself because task may already be dead by the time the bio is issued making ioc and blkcg inaccessible and those are all block layer cares about. elevator_set_req_fn() is updated such that the bio elvdata is being allocated for is available to the elevator. This doesn't update block cgroup policies yet. Further patches will implement the support. -v2: #ifdef CONFIG_BLK_CGROUP added around bio->bi_ioc dereference in rq_ioc() to fix build breakage. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Kent Overstreet <koverstreet@google.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2012-03-06 21:27:24 +01:00
..
9p	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs	2012-01-10 15:09:01 -08:00
adfs	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
affs	affs: propagate umode_t	2012-01-03 22:55:04 -05:00
afs	switch ->create() to umode_t	2012-01-03 22:54:53 -05:00
autofs4	autofs4 - fix deal with autofs4_write races	2012-01-13 08:30:49 -08:00
befs	vfs: fix the stupidity with i_dentry in inode destructors	2012-01-03 22:52:40 -05:00
bfs	switch ->create() to umode_t	2012-01-03 22:54:53 -05:00
btrfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2012-01-28 17:00:19 -08:00
cachefiles	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
ceph	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client	2012-02-02 15:47:33 -08:00
cifs	cifs: don't return error from standard_receive3 after marking response malformed	2012-02-07 22:25:31 -06:00
coda	coda: switch coda_cnode_make() to sane API as well, clean coda_lookup()	2012-01-10 11:13:16 -05:00
configfs	configfs: convert to umode_t	2012-01-03 22:54:57 -05:00
cramfs	Merge branches 'vfsmount-guts', 'umode_t' and 'partitions' into Z	2012-01-06 23:15:54 -05:00
debugfs	kernel-doc: fix new warnings in debugfs	2012-01-24 10:47:41 -08:00
devpts	devpts: fix double-free on mount failure	2012-01-08 20:19:03 -05:00
dlm	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm	2012-01-10 14:55:55 -08:00
ecryptfs	eCryptfs: move misleading function comments	2012-01-25 15:10:53 -08:00
efs	vfs: fix the stupidity with i_dentry in inode destructors	2012-01-03 22:52:40 -05:00
exofs	Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd	2012-01-09 12:51:01 -08:00
exportfs	…
ext2	ext2: protect inode changes in the SETVERSION and SETFLAGS ioctls	2012-01-11 13:39:02 +01:00
ext3	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs	2012-01-09 12:51:21 -08:00
ext4	Merge branch 'for_linus' into for_linus_merged	2012-01-10 11:54:07 -05:00
fat	Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb	2012-01-09 12:09:47 -08:00
freevxfs	fs: propagate umode_t, misc bits	2012-01-03 22:55:10 -05:00
fscache	…
fuse	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse	2012-01-12 12:39:21 -08:00
gfs2	GFS2: Fix nlink setting on inode creation	2012-01-11 12:35:05 +00:00
hfs	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
hfsplus	hfsplus: creation of hidden dir on mount can fail	2012-01-10 17:48:52 -05:00
hostfs	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
hpfs	switch ->mknod() to umode_t	2012-01-03 22:54:54 -05:00
hppfs	vfs: for usbfs, etc. internal vfsmounts ->mnt_sb->s_root == ->mnt_root	2012-01-03 22:52:41 -05:00
hugetlbfs	mm: compaction: introduce sync-light migration for use by compaction	2012-01-12 20:13:09 -08:00
isofs	isofs: inode leak on mount failure	2012-01-09 10:48:11 -05:00
jbd	jbd: Issue cache flush after checkpointing	2012-01-11 13:36:57 +01:00
jbd2	Merge branch 'for_linus' into for_linus_merged	2012-01-10 11:54:07 -05:00
jffs2	jffs2: do not initialize variable unnecessarily	2012-01-11 09:53:51 +00:00
jfs	Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm	2012-01-08 13:10:57 -08:00
lockd	module_param: make bool parameters really bool (drivers & misc)	2012-01-13 09:32:20 +10:30
logfs	mtd: fix merge conflict resolution breakage	2012-02-01 11:10:24 -08:00
minix	Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-01-08 12:19:57 -08:00
ncpfs	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
nfs	NFS client bugfixes and cleanups for Linux 3.3 (pull 2)	2012-01-16 15:08:13 -08:00
nfs_common	…
nfsd	Merge branch 'for-3.3' of git://linux-nfs.org/~bfields/linux	2012-01-14 12:26:41 -08:00
nilfs2	nilfs2: avoid overflowing segment numbers in nilfs_ioctl_clean_segments()	2012-02-08 19:03:51 -08:00
nls	NLS: raname "maxlen" to "maxout" in UTF conversion routines	2011-11-26 19:58:47 -08:00
notify	fsnotify: don't BUG in fsnotify_destroy_mark()	2012-01-14 18:01:42 -08:00
ntfs	module_param: avoid bool abuse, add bint for special cases.	2012-01-13 09:32:17 +10:30
ocfs2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm	2012-01-10 14:55:55 -08:00
omfs	omfs: propagate umode_t	2012-01-03 22:55:01 -05:00
openpromfs	vfs: fix the stupidity with i_dentry in inode destructors	2012-01-03 22:52:40 -05:00
proc	Fix race in process_vm_rw_core	2012-02-02 12:55:17 -08:00
pstore	pstore: gracefully handle NULL pstore_info functions	2011-11-18 13:49:00 -08:00
qnx4	qnx4: don't leak ->BitMap on late failure exits	2012-01-19 13:54:36 -05:00
quota	quota: Pass information that quota is stored in system file to userspace	2012-01-12 13:09:09 +01:00
ramfs	pohmelfs: propagate umode_t	2012-01-03 22:55:07 -05:00
reiserfs	reiserfs: don't lock root inode searching	2012-01-10 16:30:54 -08:00
romfs	MTD pull for 3.3	2012-01-10 13:45:22 -08:00
squashfs	Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-next	2012-01-13 10:34:57 -08:00
sysfs	sysfs: Complain bitterly about attempts to remove files from nonexistent directories.	2012-01-24 12:12:32 -08:00
sysv	vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb	2012-01-06 23:16:53 -05:00
ubifs	UBIFS: fix non-debug configuration build	2012-01-15 13:46:02 +02:00
udf	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs	2012-01-09 12:51:21 -08:00
ufs	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
xfs	xfs: use a normal shrinker for the dquot freelist	2012-02-10 12:02:05 -06:00
Kconfig	Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd	2012-01-09 12:51:01 -08:00
Kconfig.binfmt	fs: binfmt_elf: create Kconfig variable for PIE randomization	2012-01-10 16:30:51 -08:00
Makefile	Merge branches 'vfsmount-guts', 'umode_t' and 'partitions' into Z	2012-01-06 23:15:54 -05:00
aio.c	Unused iocbs in a batch should not be accounted as active.	2012-01-13 20:39:44 -08:00
anon_inodes.c	…
attr.c	switch is_sxid() to umode_t	2012-01-03 22:55:11 -05:00
bad_inode.c	switch ->mknod() to umode_t	2012-01-03 22:54:54 -05:00
binfmt_aout.c	…
binfmt_elf.c	fs: binfmt_elf: create Kconfig variable for PIE randomization	2012-01-10 16:30:51 -08:00
binfmt_elf_fdpic.c	…
binfmt_em86.c	…
binfmt_flat.c	…
binfmt_misc.c	vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb	2012-01-06 23:16:53 -05:00
binfmt_script.c	…
binfmt_som.c	…
bio-integrity.c	fs: add export.h to files using EXPORT_SYMBOL/THIS_MODULE macros	2011-10-31 19:30:31 -04:00
bio.c	block: implement bio_associate_current()	2012-03-06 21:27:24 +01:00
block_dev.c	block: Fix NULL pointer dereference in sd_revalidate_disk	2012-03-02 10:38:33 +01:00
buffer.c	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
char_dev.c	char_dev.c: fix up some whitespace errors	2011-12-13 11:18:17 -08:00
compat.c	switch open and mkdir syscalls to umode_t	2012-01-03 22:55:19 -05:00
compat_binfmt_elf.c	…
compat_ioctl.c	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-01-15 12:49:56 -08:00
dcache.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client	2012-01-13 10:29:21 -08:00
dcookies.c	…
direct-io.c	dio: optimize cache misses in the submission path	2012-01-12 20:13:12 -08:00
drop_caches.c	…
eventfd.c	…
eventpoll.c	epoll: limit paths	2012-01-12 20:13:04 -08:00
exec.c	exec: fix use-after-free bug in setup_new_exec()	2012-02-06 15:15:20 -08:00
fcntl.c	…
fhandle.c	vfs: prefer ->dentry->d_sb to ->mnt->mnt_sb	2012-01-06 23:16:53 -05:00
fifo.c	…
file.c	…
file_table.c	vfs: prevent remount read-only if pending removes	2012-01-06 23:20:13 -05:00
filesystems.c	vfs: convert fs_supers to hlist	2012-01-03 22:52:39 -05:00
fs-writeback.c	writeback: fix NULL bdi->dev in trace writeback_single_inode	2012-02-01 16:53:40 +08:00
fs_struct.c	…
generic_acl.c	…
inode.c	vfs: remove printk from set_nlink()	2012-01-17 16:39:47 -05:00
internal.h	vfs: protect remounting superblock read-only	2012-01-06 23:20:12 -05:00
ioctl.c	vfs: fix up ENOIOCTLCMD error handling	2012-01-05 15:40:12 -08:00
ioprio.c	block: strip out locking optimization in put_io_context()	2012-02-07 07:51:30 +01:00
libfs.c	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
locks.c	vfs: fix handling of lock allocation failure in lease-break case	2011-12-26 10:25:26 -08:00
mbcache.c	…
mount.h	vfs: keep list of mounts for each superblock	2012-01-06 23:20:12 -05:00
mpage.c	fs: remove unneeded plug in mpage_readpages()	2012-01-12 09:19:54 +01:00
namei.c	audit: do not call audit_getname on error	2012-01-17 16:17:01 -05:00
namespace.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-01-08 13:21:22 -08:00
no-block.c	…
open.c	switch security_path_chmod() to struct path *	2012-01-06 23:16:53 -05:00
pipe.c	pipe: fail cleanly when root tries F_SETPIPE_SZ with big size	2012-01-12 20:13:04 -08:00
pnode.c	vfs: switch pnode.h macros to struct mount *	2012-01-03 22:57:11 -05:00
pnode.h	vfs: switch pnode.h macros to struct mount *	2012-01-03 22:57:11 -05:00
posix_acl.c	vfs: pass all mask flags check_acl and posix_acl_permission	2011-10-28 14:58:54 +02:00
proc_namespace.c	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
read_write.c	Cross Memory Attach	2011-10-31 17:30:44 -07:00
read_write.h	…
readdir.c	…
select.c	…
seq_file.c	constify seq_file stuff	2012-01-03 22:52:40 -05:00
signalfd.c	…
splice.c	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
stack.c	filesystems: add set_nlink()	2011-11-02 12:53:43 +01:00
stat.c	readlinkat: ensure we return ENOENT for the empty pathname for normal lookups	2011-11-02 12:53:42 +01:00
statfs.c	vfs: new helper - vfs_ustat()	2012-01-03 22:53:07 -05:00
super.c	wake up s_wait_unfrozen when ->freeze_fs fails	2012-01-17 16:38:47 -05:00
sync.c	fs: move code out of buffer.c	2012-01-03 22:54:07 -05:00
timerfd.c	…
utimes.c	…
xattr.c	vfs: mnt_drop_write_file()	2012-01-03 22:52:40 -05:00
xattr_acl.c	…