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044b9414c7
linux/fs
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Steven Whitehouse 044b9414c7 GFS2: Fix inode deallocation race 
This area of the code has always been a bit delicate due to the
subtleties of lock ordering. The problem is that for "normal"
alloc/dealloc, we always grab the inode locks first and the rgrp lock
later.

In order to ensure no races in looking up the unlinked, but still
allocated inodes, we need to hold the rgrp lock when we do the lookup,
which means that we can't take the inode glock.

The solution is to borrow the technique already used by NFS to solve
what is essentially the same problem (given an inode number, look up
the inode carefully, checking that it really is in the expected
state).

We cannot do that directly from the allocation code (lock ordering
again) so we give the job to the pre-existing delete workqueue and
carry on with the allocation as normal.

If we find there is no space, we do a journal flush (required anyway
if space from a deallocation is to be released) which should block
against the pending deallocations, so we should always get the space
back.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
2010-11-15 12:44:42 +00:00
..
9p convert v9fs 2010-10-29 04:16:38 -04:00
adfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
affs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
afs convert afs 2010-10-29 04:17:13 -04:00
autofs4 convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
befs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
bfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
btrfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable 2010-10-30 09:05:48 -07:00
cachefiles
ceph convert ceph 2010-10-29 04:17:18 -04:00
cifs cifs: fix a memleak in cifs_setattr_nounix() 2010-11-09 15:17:53 +00:00
coda convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
configfs convert get_sb_single() users 2010-10-29 04:16:28 -04:00
cramfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
debugfs convert get_sb_single() users 2010-10-29 04:16:28 -04:00
devpts convert get_sb_single() users 2010-10-29 04:16:28 -04:00
dlm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm 2010-10-22 17:33:16 -07:00
ecryptfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6 2010-10-29 14:15:12 -07:00
efs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
exofs convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
exportfs exportfs: use dget_parent 2010-10-25 21:26:13 -04:00
ext2 new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
ext3 new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
ext4 Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 2010-11-08 11:54:53 -08:00
fat new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
freevxfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
fscache
fuse convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
gfs2 GFS2: Fix inode deallocation race 2010-11-15 12:44:42 +00:00
hfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
hfsplus new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
hostfs convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
hpfs Merge branches 'irq-core-for-linus' and 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-10-31 20:40:24 -04:00
hppfs convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
hugetlbfs hugetlbfs: lessen the impact of a deprecation warning 2010-11-12 07:55:32 -08:00
isofs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
jbd Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6 2010-10-27 20:13:18 -07:00
jbd2 jbd2: Convert jbd2_slab_create_sem to mutex 2010-10-30 12:12:50 +02:00
jffs2 Merge git://git.infradead.org/mtd-2.6 2010-10-30 08:31:35 -07:00
jfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
lockd lockd: fix nlmsvc_notify_blocked locking 2010-10-27 21:39:50 +02:00
logfs fs: logfs: Fix up MTD=y build. 2010-11-01 16:34:56 -04:00
minix new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
ncpfs convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
nfs locks: let the caller free file_lock on ->setlease failure 2010-10-31 06:35:15 -07:00
nfs_common
nfsd nfsd4: fix 4.1 connection registration race 2010-11-02 17:13:52 -04:00
nilfs2 convert nilfs 2010-10-29 04:16:53 -04:00
nls
notify make fanotify_read() restartable across signals 2010-10-30 14:07:35 -04:00
ntfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
ocfs2 convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
omfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
openpromfs sparc: fix openpromfs compile 2010-11-08 14:29:39 -08:00
partitions Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2010-10-25 07:45:10 -07:00
proc switch procfs to ->mount() 2010-10-29 04:17:01 -04:00
qnx4 new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
quota quota: Fix possible oops in __dquot_initialize() 2010-10-28 01:30:06 +02:00
ramfs convert get_sb_nodev() users 2010-10-29 04:16:31 -04:00
reiserfs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
romfs convert get_sb_mtd() users to ->mount() 2010-10-29 04:16:26 -04:00
squashfs Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus 2010-10-29 08:48:58 -07:00
sysfs convert sysfs 2010-10-29 04:17:08 -04:00
sysv new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
ubifs convert ubifs 2010-10-29 04:16:36 -04:00
udf new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
ufs new helper: mount_bdev() 2010-10-29 04:16:13 -04:00
xfs xfs: remove incorrect assert in xfs_vm_writepage 2010-11-10 15:51:10 -06:00
aio.c new helper: ihold() 2010-10-25 21:26:11 -04:00
anon_inodes.c convert get_sb_pseudo() users 2010-10-29 04:16:33 -04:00
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c
binfmt_elf.c
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c convert get_sb_single() users 2010-10-29 04:16:28 -04:00
binfmt_script.c
binfmt_som.c
bio-integrity.c
bio.c bio: take care not overflow page count when mapping/copying user data 2010-11-10 14:40:43 +01:00
block_dev.c convert get_sb_pseudo() users 2010-10-29 04:16:33 -04:00
buffer.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-10-26 17:58:44 -07:00
char_dev.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
compat_binfmt_elf.c
compat_ioctl.c Merge 'staging-next' to Linus's tree 2010-10-28 09:44:56 -07:00
compat.c fs/compat.c: fix build on MIPS/s390 2010-10-30 08:19:35 -07:00
dcache.c fs: use RCU read side protection in d_validate 2010-10-25 21:26:13 -04:00
dcookies.c
direct-io.c fs/direct-io.c: fix truncation error in dio_complete() return 2010-10-26 16:52:13 -07:00
drop_caches.c
eventfd.c
eventpoll.c epoll: make epoll_wait() use the hrtimer range feature 2010-10-27 18:03:18 -07:00
exec.c exec: don't turn PF_KTHREAD off when a target command was not found 2010-10-27 18:03:13 -07:00
fcntl.c fasync: Fix placement of FASYNC flag comment 2010-10-27 18:17:02 -07:00
fifo.c
file_table.c fs: allow for more than 2^31 files 2010-10-26 16:52:15 -07:00
file.c
filesystems.c
fs_struct.c
fs-writeback.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable 2010-10-30 09:05:48 -07:00
generic_acl.c
inode.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-10-26 17:58:44 -07:00
internal.h braino in internal.h 2010-10-29 05:49:13 -04:00
ioctl.c fs: Add FITRIM ioctl 2010-10-27 21:30:11 -04:00
ioprio.c ioprio: rcu_read_lock/unlock protect find_task_by_vpid call (V2) 2010-11-10 14:40:53 +01:00
Kconfig Merge 'staging-next' to Linus's tree 2010-10-28 09:44:56 -07:00
Kconfig.binfmt coredump: default CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=y 2010-10-27 18:03:12 -07:00
libfs.c convert get_sb_pseudo() users 2010-10-29 04:16:33 -04:00
locks.c locks: remove dead lease error-handling code 2010-11-10 14:31:29 -05:00
Makefile Merge 'staging-next' to Linus's tree 2010-10-28 09:44:56 -07:00
mbcache.c
mpage.c
namei.c fix open/umount race 2010-10-29 04:14:56 -04:00
namespace.c vfs: fix infinite loop caused by clone_mnt race 2010-10-25 21:24:16 -04:00
nfsctl.c
no-block.c
open.c fix open/umount race 2010-10-29 04:14:56 -04:00
pipe.c convert get_sb_pseudo() users 2010-10-29 04:16:33 -04:00
pnode.c
pnode.h
posix_acl.c
read_write.c readv/writev: do the same MAX_RW_COUNT truncation that read/write does 2010-10-29 10:36:49 -07:00
read_write.h
readdir.c
select.c epoll: make epoll_wait() use the hrtimer range feature 2010-10-27 18:03:18 -07:00
seq_file.c fs: take dcache_lock inside __d_path 2010-10-25 21:26:12 -04:00
signalfd.c Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6 2010-10-26 10:13:10 -07:00
splice.c
stack.c
stat.c
statfs.c
super.c switch get_sb_ns() users 2010-10-29 04:17:03 -04:00
sync.c
timerfd.c
utimes.c
xattr_acl.c
xattr.c