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Dave Chinner 1f3c785c3a xfs: move allocation stack switch up to xfs_bmapi_allocate 
Switching stacks are xfs_alloc_vextent can cause deadlocks when we
run out of worker threads on the allocation workqueue. This can
occur because xfs_bmap_btalloc can make multiple calls to
xfs_alloc_vextent() and even if xfs_alloc_vextent() fails it can
return with the AGF locked in the current allocation transaction.

If we then need to make another allocation, and all the allocation
worker contexts are exhausted because the are blocked waiting for
the AGF lock, holder of the AGF cannot get it's xfs-alloc_vextent
work completed to release the AGF.  Hence allocation effectively
deadlocks.

To avoid this, move the stack switch one layer up to
xfs_bmapi_allocate() so that all of the allocation attempts in a
single switched stack transaction occur in a single worker context.
This avoids the problem of an allocation being blocked waiting for
a worker thread whilst holding the AGF.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-11-08 11:08:46 -06:00
..
9p The following changes since commit 4cbe5a555f: 2012-10-12 09:59:23 +09:00
adfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
affs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
afs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
autofs4 autofs4 - fix reset pending flag on mount fail 2012-10-11 10:21:16 +09:00
befs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
bfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
btrfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2012-10-13 13:23:39 -07:00
cachefiles fs: cachefiles: add support for large files in filesystem caching 2012-07-30 17:25:21 -07:00
ceph tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking 2012-10-09 23:33:55 -04:00
cifs Merge branch 'modules-next' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux 2012-10-14 13:39:34 -07:00
coda fs: push rcu_barrier() from deactivate_locked_super() to filesystems 2012-10-02 21:35:55 -04:00
configfs userns: Convert configfs to use kuid and kgid where appropriate 2012-09-18 01:01:37 -07:00
cramfs userns: Convert cramfs to use kuid/kgid where appropriate 2012-09-21 03:13:08 -07:00
debugfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2012-10-02 11:11:09 -07:00
devpts VFS: Pass mount flags to sget() 2012-07-14 16:38:34 +04:00
dlm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-10-02 13:38:27 -07:00
ecryptfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
efs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
exofs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-12 10:52:03 +09:00
exportfs switch dentry_open() to struct path, make it grab references itself 2012-07-23 00:01:29 +04:00
ext2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
ext3 ext3: drop lock/unlock super 2012-10-09 23:33:38 -04:00
ext4 mm: kill vma flag VM_CAN_NONLINEAR 2012-10-09 16:22:17 +09:00
fat fat: drop lock/unlock super 2012-10-09 23:33:38 -04:00
freevxfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
fscache
fuse mm: kill vma flag VM_CAN_NONLINEAR 2012-10-09 16:22:17 +09:00
gfs2 tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking 2012-10-09 23:33:55 -04:00
hfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
hfsplus Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
hostfs Merge branch 'for-linus-37rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml 2012-10-10 11:15:20 +09:00
hpfs hpfs: drop lock/unlock super 2012-10-09 23:33:38 -04:00
hppfs hppfs: fix the return value of get_inode() 2012-10-09 22:34:52 +02:00
hugetlbfs mm: replace vma prio_tree with an interval tree 2012-10-09 16:22:39 +09:00
isofs tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking 2012-10-09 23:33:55 -04:00
jbd jbd: Fix assertion failure in commit code due to lacking transaction credits 2012-09-12 15:52:03 +02:00
jbd2 The big new feature added this time is supporting online resizing 2012-10-08 06:36:39 +09:00
jffs2 UAPI Disintegration 2012-10-09 2012-10-09 15:04:25 +01:00
jfs JFS TRIM support and some minor fixes 2012-10-03 08:48:21 -07:00
lockd Merge branch 'for-3.7' of git://linux-nfs.org/~bfields/linux 2012-10-13 10:53:54 +09:00
logfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
minix Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
ncpfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
nfs Merge branch 'for-3.7' of git://linux-nfs.org/~bfields/linux 2012-10-13 10:53:54 +09:00
nfs_common
nfsd UAPI Disintegration 2012-10-09 2012-10-09 18:35:22 -04:00
nilfs2 mm: kill vma flag VM_CAN_NONLINEAR 2012-10-09 16:22:17 +09:00
nls
notify switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
ntfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
ocfs2 mm: kill vma flag VM_CAN_NONLINEAR 2012-10-09 16:22:17 +09:00
omfs omfs: convert to use beXX_add_cpu() 2012-10-06 03:05:31 +09:00
openpromfs fs: push rcu_barrier() from deactivate_locked_super() to filesystems 2012-10-02 21:35:55 -04:00
proc procfs: don't need a PATH_MAX allocation to hold a string representation of an int 2012-10-12 20:15:10 -04:00
pstore pstore: Avoid recursive spinlocks in the oops_in_progress case 2012-09-20 17:04:50 -07:00
qnx4 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
qnx6 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
quota vfs: define struct filename and have getname() return it 2012-10-12 20:14:55 -04:00
ramfs don't pass nameidata to ->create() 2012-07-14 16:34:47 +04:00
reiserfs tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking 2012-10-09 23:33:55 -04:00
romfs fs: push rcu_barrier() from deactivate_locked_super() to filesystems 2012-10-02 21:35:55 -04:00
squashfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
sysfs sysfs: Fix comment typo "sysf_create_link". 2012-09-04 16:11:31 -07:00
sysv sysv: drop lock/unlock super 2012-10-09 23:33:39 -04:00
ubifs mm: kill vma flag VM_CAN_NONLINEAR 2012-10-09 16:22:17 +09:00
udf Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2012-10-04 09:14:01 -07:00
ufs ufs: drop lock/unlock super 2012-10-09 23:33:39 -04:00
xfs xfs: move allocation stack switch up to xfs_bmapi_allocate 2012-11-08 11:08:46 -06:00
aio.c aio: now fput() is OK from interrupt context; get rid of manual delayed __fput() 2012-07-22 23:57:59 +04:00
anon_inodes.c
attr.c ima: add inode_post_setattr call 2012-09-07 14:57:46 -04:00
bad_inode.c don't pass nameidata to ->create() 2012-07-14 16:34:47 +04:00
binfmt_aout.c coredump: pass siginfo_t* to do_coredump() and below, not merely signr 2012-10-06 03:05:16 +09:00
binfmt_elf.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-10-10 12:02:25 +09:00
binfmt_elf_fdpic.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-10-10 12:02:25 +09:00
binfmt_em86.c
binfmt_flat.c coredump: pass siginfo_t* to do_coredump() and below, not merely signr 2012-10-06 03:05:16 +09:00
binfmt_misc.c
binfmt_script.c
binfmt_som.c
bio-integrity.c block: Ues bi_pool for bio_integrity_alloc() 2012-09-09 10:35:38 +02:00
bio.c block: makes bio_split support bio without data 2012-09-28 10:38:48 +02:00
block_dev.c Merge branch 'for-3.7/core' of git://git.kernel.dk/linux-block 2012-10-11 09:04:23 +09:00
buffer.c The big new feature added this time is supporting online resizing 2012-10-08 06:36:39 +09:00
char_dev.c
compat.c vfs: define struct filename and have getname() return it 2012-10-12 20:14:55 -04:00
compat_binfmt_elf.c coredump: extend core dump note section to contain file names of mapped files 2012-10-06 03:05:17 +09:00
compat_ioctl.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
coredump.c coredump: pass siginfo_t* to do_coredump() and below, not merely signr 2012-10-06 03:05:16 +09:00
coredump.h coredump: update coredump-related headers 2012-10-06 03:05:15 +09:00
dcache.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
dcookies.c
direct-io.c block: move down direct IO plugging 2012-08-09 15:23:09 +02:00
drop_caches.c
eventfd.c
eventpoll.c epoll: support for disabling items, and a self-test app 2012-10-06 03:05:00 +09:00
exec.c vfs: make path_openat take a struct filename pointer 2012-10-12 20:15:09 -04:00
fcntl.c Fix F_DUPFD_CLOEXEC breakage 2012-10-09 15:52:31 +09:00
fhandle.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
fifo.c fifo: Do not restart open() if it already found a partner 2012-07-16 08:33:14 -07:00
file.c dup3: Return an error when oldfd == newfd. 2012-10-09 23:33:38 -04:00
file_table.c lglock: add DEFINE_STATIC_LGLOCK() 2012-10-10 01:15:44 -04:00
filesystems.c vfs: define struct filename and have getname() return it 2012-10-12 20:14:55 -04:00
fs-writeback.c Merge branch 'writeback-for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux 2012-10-12 10:46:03 +09:00
fs_struct.c get rid of ->mnt_longterm 2012-07-14 16:32:47 +04:00
generic_acl.c userns: Pass a userns parameter into posix_acl_to_xattr and posix_acl_from_xattr 2012-09-18 01:01:35 -07:00
inode.c mm: replace vma prio_tree with an interval tree 2012-10-09 16:22:39 +09:00
internal.h vfs: make path_openat take a struct filename pointer 2012-10-12 20:15:09 -04:00
ioctl.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
ioprio.c
Kconfig
Kconfig.binfmt coredump: make core dump functionality optional 2012-10-06 03:05:15 +09:00
libfs.c vfs: fix kerneldoc for generic_fh_to_parent() 2012-09-05 10:59:30 +02:00
locks.c UAPI Disintegration 2012-10-09 2012-10-09 18:35:22 -04:00
Makefile coredump: make core dump functionality optional 2012-10-06 03:05:15 +09:00
mbcache.c
mount.h get rid of magic in proc_namespace.c 2012-07-14 16:32:48 +04:00
mpage.c
namei.c vfs: embed struct filename inside of names_cache allocation if possible 2012-10-12 20:15:10 -04:00
namespace.c vfs: define struct filename and have getname() return it 2012-10-12 20:14:55 -04:00
no-block.c
open.c vfs: make path_openat take a struct filename pointer 2012-10-12 20:15:09 -04:00
pipe.c pipe(2) - race-free error recovery 2012-09-26 21:08:52 -04:00
pnode.c VFS: Make clone_mnt()/copy_tree()/collect_mounts() return errors 2012-07-14 16:37:27 +04:00
pnode.h
posix_acl.c userns: Convert vfs posix_acl support to use kuids and kgids 2012-09-18 01:01:35 -07:00
proc_namespace.c get rid of magic in proc_namespace.c 2012-07-14 16:32:48 +04:00
read_write.c compat: fs: Generic compat_sys_sendfile implementation 2012-10-02 21:35:55 -04:00
read_write.h compat: fs: Generic compat_sys_sendfile implementation 2012-10-02 21:35:55 -04:00
readdir.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
select.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
seq_file.c userns: Make seq_file's user namespace accessible 2012-08-14 21:47:55 -07:00
signalfd.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
splice.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
stack.c
stat.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
statfs.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
super.c vfs: drop lock/unlock super 2012-10-09 23:33:39 -04:00
sync.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
timerfd.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
utimes.c switch simple cases of fget_light to fdget 2012-09-26 22:20:08 -04:00
xattr.c audit: set the name_len in audit_inode for parent lookups 2012-10-12 00:32:01 -04:00
xattr_acl.c userns: Fix posix_acl_file_xattr_userns gid conversion 2012-10-12 13:16:48 -07:00