Josef Bacik cf74982385 Btrfs: fix deadlock between alloc_mutex/chunk_mutex ...

This fixes a deadlock that happens between the alloc_mutex and chunk_mutex.
Process A comes in, decides to do a do_chunk_alloc, which takes the
chunk_mutex, and is holding the alloc_mutex because the only way you get to
do_chunk_alloc is by holding the alloc_mutex.  btrfs_alloc_chunk does its thing
and goes to insert a new item, which results in a cow of the block.

We get into del_pending_extents from there, where if we need to be rescheduled
we drop the alloc_mutex and schedule.  At this point process B comes in to do
an allocation and gets the alloc_mutex, and because process A did not do the
chunk allocation completely it thinks its a good time to do a chunk allocation
as well, and hangs on the chunk_mutex.

Process A wakes up and tries to take the alloc_mutex and cannot.  The way to
fix this is do a mutex_trylock() on chunk_mutex.  If we return 0 we didn't get
the lock, and if this is just a "hey it may be a good time to allocate a chunk"
then we just exit.  If we are trying to force an allocation then we reschedule
and keep trying to acquire the chunk_mutex.  If once we acquire it the space is
already full then we can just exit, otherwise we can continue with the chunk
allocation.  Thank you,

Signed-off-by: Josef Bacik <jbacik@redhat.com>

2008-10-01 19:11:18 -04:00

..

9p

[PATCH] fix ->llseek() for a bunch of directories

2008-08-25 01:18:09 -04:00

adfs

[PATCH] fix ->llseek() for a bunch of directories

2008-08-25 01:18:09 -04:00

affs

[PATCH] fix ->llseek() for a bunch of directories

2008-08-25 01:18:09 -04:00

afs

mm: rename page trylock

2008-08-04 21:31:34 -07:00

autofs

mount options: fix autofs

2008-02-08 09:22:40 -08:00

autofs4

[PATCH] fix ->llseek() for a bunch of directories

2008-08-25 01:18:09 -04:00

befs

[PATCH] fix ->llseek() for a bunch of directories

2008-08-25 01:18:09 -04:00

bfs

bfs: fix Lockdep warning

2008-09-13 14:41:51 -07:00

btrfs

Btrfs: fix deadlock between alloc_mutex/chunk_mutex

2008-10-01 19:11:18 -04:00

cifs

[CIFS] Turn off Unicode during session establishment for plaintext authentication

2008-08-28 15:32:22 +00:00

coda

[PATCH] sanitize __user_walk_fd() et.al.

2008-07-26 20:53:34 -04:00

configfs

[PATCH] configfs: Consolidate locking around configfs_detach_prep() in configfs_rmdir()

2008-08-22 11:09:02 -07:00

cramfs

cramfs: fix named-pipe handling

2008-08-20 15:40:32 -07:00

debugfs

debugfs: Implement debugfs_remove_recursive()

2008-07-21 21:54:59 -07:00

devpts

[PATCH] devpts: switch to IDA

2008-08-01 11:25:29 -04:00

dlm

dlm: rename structs

2008-08-13 12:47:36 -05:00

ecryptfs

eCryptfs: use page_alloc not kmalloc to get a page of memory

2008-07-28 16:30:21 -07:00

efs

[PATCH] fix efs_lookup()

2008-08-25 01:18:04 -04:00

exportfs

fs: replace remaining __FUNCTION__ occurrences

2008-04-30 08:29:54 -07:00

ext2

vfs: pagecache usage optimization for pagesize!=blocksize

2008-07-28 16:30:21 -07:00

ext3

[PATCH] fix races and leaks in vfs_quota_on() users

2008-08-01 11:25:25 -04:00

ext4

ext4: Initialize writeback_index to 0 when allocating a new inode

2008-08-19 21:14:52 -04:00

fat

vfat: fix 'sync' mount deadlock due to BKL->lock_super conversion

2008-08-20 08:31:19 -07:00

freevxfs

fs/freevxfs/: proper externs

2008-04-29 08:06:00 -07:00

fuse

[PATCH] fix MAY_CHDIR/MAY_ACCESS/LOOKUP_ACCESS mess

2008-07-26 20:53:21 -04:00

gfs2

[PATCH] don't pass nameidata to gfs2_lookupi()

2008-07-26 20:53:36 -04:00

hfs

[PATCH] f_count may wrap around

2008-07-26 20:53:40 -04:00

hfsplus

[PATCH] f_count may wrap around

2008-07-26 20:53:40 -04:00

hostfs

[PATCH] sanitize ->permission() prototype

2008-07-26 20:53:14 -04:00

hpfs

[patch 05/14] hpfs: dont call permission()

2008-07-26 20:53:13 -04:00

hppfs

[patch] hppfs: remove hppfs_permission

2008-07-26 20:53:07 -04:00

hugetlbfs

SL*B: drop kmem cache argument from constructor

2008-07-26 12:00:07 -07:00

isofs

SL*B: drop kmem cache argument from constructor

2008-07-26 12:00:07 -07:00

jbd

Merge branch 'core/locking' into core/urgent

2008-08-12 00:11:49 +02:00

jbd2

Merge branch 'core/locking' into core/urgent

2008-08-12 00:11:49 +02:00

jffs2

removed unused #include <linux/version.h>'s

2008-08-23 12:14:12 -07:00

jfs

[PATCH] sanitize ->permission() prototype

2008-07-26 20:53:14 -04:00

lockd

Merge branch 'for-2.6.27' of git://linux-nfs.org/~bfields/linux

2008-08-12 16:39:22 -07:00

minix

SL*B: drop kmem cache argument from constructor

2008-07-26 12:00:07 -07:00

msdos

fatfs: add UTC timestamp option

2008-07-25 10:53:34 -07:00

ncpfs

[PATCH] don't pass nameidata to __ncp_lookup_validate()

2008-07-26 20:53:37 -04:00

nfs

NFS: Restore missing hunk in NFS mount option parser

2008-09-08 15:35:19 -07:00

nfs_common

[PATCH] nfs_common endianness annotations

2006-10-20 10:26:41 -07:00

nfsd

nfsd: fix buffer overrun decoding NFSv4 acl

2008-09-01 14:24:24 -04:00

nls

sparse pointer use of zero as null

2007-10-18 14:37:31 -07:00

ntfs

NTFS: update homepage

2008-09-02 19:21:37 -07:00

ocfs2

ocfs2: Fix a bug in direct IO read.

2008-09-10 01:44:08 -07:00

omfs

omfs: fix oops when file metadata is corrupted

2008-08-15 08:35:44 -07:00

openpromfs

SL*B: drop kmem cache argument from constructor

2008-07-26 12:00:07 -07:00

partitions

rescan_partitions(): make device capacity errors non-fatal

2008-09-13 14:41:52 -07:00

proc

mm: ifdef Quicklists in /proc/meminfo

2008-09-13 14:41:51 -07:00

qnx4

SL*B: drop kmem cache argument from constructor

2008-07-26 12:00:07 -07:00

ramfs

ramfs: enable splice write

2008-07-04 09:52:14 +02:00

reiserfs

reiserfs: removed duplicated #include

2008-08-12 16:07:30 -07:00

romfs

romfs_readpage: don't report errors for pages beyond i_size

2008-07-30 14:30:34 -07:00

smbfs

[PATCH] sanitize ->permission() prototype

2008-07-26 20:53:14 -04:00

sysfs

Use WARN() in fs/sysfs

2008-07-26 12:00:07 -07:00

sysv

SL*B: drop kmem cache argument from constructor

2008-07-26 12:00:07 -07:00

ubifs

UBIFS: make minimum fanout 3

2008-09-05 20:02:35 +03:00

udf

udf: add llseek method

2008-09-08 20:31:04 +02:00

ufs

Revert "UFS: add const to parser token table"

2008-08-04 16:50:38 -07:00

vfat

fatfs: add UTC timestamp option

2008-07-25 10:53:34 -07:00

xfs

[XFS] Don't do I/O beyond eof when unreserving space

2008-09-17 16:52:50 +10:00

aio.c

[PATCH] f_count may wrap around

2008-07-26 20:53:40 -04:00

anon_inodes.c

flag parameters: NONBLOCK in anon_inode_getfd

2008-07-24 10:47:28 -07:00

attr.c

[patch 4/4] vfs: immutable inode checking cleanup

2008-07-26 20:53:28 -04:00

bad_inode.c

[PATCH] sanitize ->permission() prototype

2008-07-26 20:53:14 -04:00

binfmt_aout.c

tracehook: exec

2008-07-26 12:00:08 -07:00

binfmt_elf_fdpic.c

binfmt_elf_fdpic: Magical stack pointer index, for NEW_AUX_ENT compat.

2008-07-28 18:10:28 +09:00

binfmt_elf.c

tracehook: exec

2008-07-26 12:00:08 -07:00

binfmt_em86.c

binfmt_misc.c: avoid potential kernel stack overflow

2008-04-29 08:06:04 -07:00

binfmt_flat.c

binfmt_flat: Stub in a FLAT_PLAT_INIT().

2008-08-11 20:17:55 +09:00

binfmt_misc.c

binfmt_misc: fix false -ENOEXEC when coupled with other binary handlers

2008-08-20 15:40:31 -07:00

binfmt_script.c

binfmt_misc.c: avoid potential kernel stack overflow

2008-04-29 08:06:04 -07:00

binfmt_som.c

tracehook: exec

2008-07-26 12:00:08 -07:00

bio-integrity.c

bio-integrity: remove EXPORT_SYMBOL for bio_integrity_init_slab()

2008-07-28 16:30:21 -07:00

bio.c

bio: fix __bio_copy_iov() handling of bio->bv_len

2008-08-27 09:50:19 +02:00

block_dev.c

[PATCH] switch mtd and dm-table to lookup_bdev()

2008-08-01 11:25:31 -04:00

buffer.c

block: submit_bh() inadvertently discards barrier flag on a sync write

2008-08-27 09:50:19 +02:00

char_dev.c

Remove the lock_kernel() call from chrdev_open()

2008-06-20 14:05:53 -06:00

compat_binfmt_elf.c

x86: compat_binfmt_elf

2008-01-30 13:31:46 +01:00

compat_ioctl.c

remove unused #include <linux/dirent.h>'s

2008-07-25 10:53:34 -07:00

compat.c

[PATCH] fix regular readdir() and friends

2008-08-25 01:18:08 -04:00

dcache.c

[PATCH] change d_add_ci argument ordering

2008-08-25 01:18:05 -04:00

dcookies.c

d_path: Make d_path() use a struct path

2008-02-14 21:17:09 -08:00

direct-io.c

dio: use get_user_pages_fast

2008-07-26 12:00:06 -07:00

dnotify.c

[PATCH] split linux/file.h

2008-05-01 13:08:16 -04:00

dquot.c

[PATCH] fix races and leaks in vfs_quota_on() users

2008-08-01 11:25:25 -04:00

drop_caches.c

vfs: skip inodes without pages to free in drop_pagecache_sb()

2008-04-29 08:06:05 -07:00

eventfd.c

flag parameters: check magic constants

2008-07-24 10:47:29 -07:00

eventpoll.c

fs/eventpoll.c: fix sys_epoll_create1() comment

2008-08-12 16:07:30 -07:00

exec.c

exec: include pagemap.h again to fix build

2008-07-28 16:30:20 -07:00

fcntl.c

[PATCH] clean dup2() up a bit

2008-08-01 11:25:24 -04:00

fifo.c

[PATCH] reuse xxx_fifo_fops for xxx_pipe_fops

2008-07-26 20:53:06 -04:00

file_table.c

[PATCH] f_count may wrap around

2008-07-26 20:53:40 -04:00

file.c

[PATCH] merge locate_fd() and get_unused_fd()

2008-08-01 11:25:23 -04:00

filesystems.c

add filesystem subtype support

2007-05-08 11:15:01 -07:00

fs-writeback.c

VFS: export sync_sb_inodes

2008-07-14 19:10:52 +03:00

generic_acl.c

Introduce is_owner_or_cap() to wrap CAP_FOWNER use with fsuid check

2007-07-17 12:00:03 -07:00

inode.c

fs/inode.c: properly init address_space->writeback_index

2008-08-15 08:35:44 -07:00

inotify_user.c

[PATCH] sanitize __user_walk_fd() et.al.

2008-07-26 20:53:34 -04:00

inotify.c

inotify: remove debug code

2008-02-06 10:41:07 -08:00

internal.h

[PATCH] move a bunch of declarations to fs/internal.h

2008-04-21 23:11:01 -04:00

ioctl.c

make vfs_ioctl() static

2008-04-29 08:06:00 -07:00

ioprio.c

fix setpriority(PRIO_PGRP) thread iterator breakage

2008-08-20 15:40:32 -07:00

Kconfig

Add Btrfs to fs/Kconfig and fs/Makefile

2008-09-25 15:41:59 -04:00

Kconfig.binfmt

sh: Initial ELF FDPIC support.

2008-07-28 18:10:28 +09:00

libfs.c

VFS: increase pseudo-filesystem block size to PAGE_SIZE

2008-07-30 09:41:44 -07:00

locks.c

SL*B: drop kmem cache argument from constructor

2008-07-26 12:00:07 -07:00

Makefile

Add Btrfs to fs/Kconfig and fs/Makefile

2008-09-25 15:41:59 -04:00

mbcache.c

vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs

2008-04-15 19:35:41 -07:00

mpage.c

vfs: add hooks for ext4's delayed allocation support

2008-07-11 19:27:31 -04:00

namei.c

[patch 3/4] vfs: remove unused nameidata argument of may_create()

2008-08-01 11:25:30 -04:00

namespace.c

[PATCH] pass struct path * to do_add_mount()

2008-08-01 11:25:32 -04:00

nfsctl.c

Introduce path_put()

2008-02-14 21:13:33 -08:00

no-block.c

[PATCH] BLOCK: Make it possible to disable the block layer [try #6]

2006-09-30 20:52:31 +02:00

open.c

[PATCH] merge locate_fd() and get_unused_fd()

2008-08-01 11:25:23 -04:00

pipe.c

[PATCH] reuse xxx_fifo_fops for xxx_pipe_fops

2008-07-26 20:53:06 -04:00

pnode.c

[patch 7/7] vfs: mountinfo: show dominating group id

2008-04-23 00:05:09 -04:00

pnode.h

[patch 7/7] vfs: mountinfo: show dominating group id

2008-04-23 00:05:09 -04:00

posix_acl.c

[PATCH] kmemdup: some users

2006-10-01 00:39:19 -07:00

quota_v1.c

quota: move function-macros from quota.h to quotaops.h

2008-07-25 10:53:35 -07:00

quota_v2.c

quota: move function-macros from quota.h to quotaops.h

2008-07-25 10:53:35 -07:00

quota.c

quota: cleanup loop in sync_dquots()

2008-07-25 10:53:35 -07:00

read_write.c

Remove BKL from remote_llseek v2

2008-07-02 15:06:27 -06:00

read_write.h

[PATCH] Remove readv/writev methods and use aio_read/aio_write instead

2006-10-01 00:39:28 -07:00

readdir.c

[PATCH] fix regular readdir() and friends

2008-08-25 01:18:08 -04:00

select.c

Fix performance regression on lmbench select benchmark

2008-06-22 12:23:15 -07:00

seq_file.c

[PATCH] deal with the first call of ->show() generating no output

2008-08-25 01:18:10 -04:00

signalfd.c

flag parameters: check magic constants

2008-07-24 10:47:29 -07:00

splice.c

mm: rename page trylock

2008-08-04 21:31:34 -07:00

stack.c

[PATCH] fs/stack.c: Copy i_nlink after all other attributes are copied

2007-02-19 14:21:50 -08:00

stat.c

[PATCH] sanitize __user_walk_fd() et.al.

2008-07-26 20:53:34 -04:00

super.c

fix soft lock up at NFS mount via per-SB LRU-list of unused dentries

2008-07-24 10:47:15 -07:00

sync.c

SYNC_FILE_RANGE_WRITE may and will block. Document that.

2008-07-24 10:47:17 -07:00

timerfd.c

flag parameters: check magic constants

2008-07-24 10:47:29 -07:00

utimes.c

[PATCH] sanitize __user_walk_fd() et.al.

2008-07-26 20:53:34 -04:00

xattr_acl.c

[PATCH] remove many unneeded #includes of sched.h

2007-02-14 08:09:54 -08:00

xattr.c

[PATCH] sanitize __user_walk_fd() et.al.

2008-07-26 20:53:34 -04:00