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c018daecea
linux/fs/btrfs
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Miao Xie c018daecea Btrfs: protect fs_info->alloc_start 
fs_info->alloc_start is a 64bits variant, can be accessed by
multi-task, but it is not protected strictly, it can be changed
while we are accessing it. On 32bit machine, we will get wrong
value because we access it by two instructions.(In fact, it is
also possible that the same problem happens on the 64bit machine,
because the compiler may split the 64bit operation into two 32bit
operation.)

For example:
Assuming -> alloc_start is 0x0000 0000 0001 0000 at the beginning,
then we remount and set ->alloc_start to 0x0000 0100 0000 0000.
	Task0 			Task1
				load high 32 bits
	set high 32 bits
	set low 32 bits
				load low 32 bits

Task1 will get 0.

This patch fixes this problem by using two locks to protect it
	fs_info->chunk_mutex
	sb->s_umount
On the read side, we just need get one of these two locks, and on
the write side, we must lock all of them.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-02-20 12:59:02 -05:00
..
acl.c Btrfs: skip adding an acl attribute if we don't have to 2012-12-16 20:46:15 -05:00
async-thread.c Btrfs: call the ordered free operation without any locks held 2012-07-25 16:15:07 -04:00
async-thread.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
backref.c Btrfs: merge inode_list in __merge_refs 2012-12-12 17:15:27 -05:00
backref.h Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.h 2013-02-20 09:37:28 -05:00
btrfs_inode.h Btrfs: inline csums if we're fsyncing 2012-12-16 20:46:22 -05:00
check-integrity.c Btrfs: fix race in check-integrity caused by usage of bitfield 2012-12-16 20:46:13 -05:00
check-integrity.h Btrfs: add optional integrity check code 2011-12-21 19:14:09 +01:00
compat.h
compression.c Btrfs: handle errors from btrfs_map_bio() everywhere 2012-12-12 17:15:40 -05:00
compression.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
ctree.c Btrfs: fix crash in log replay with qgroups enabled 2013-02-14 20:47:41 -05:00
ctree.h Btrfs: protect fs_info->alloc_start 2013-02-20 12:59:02 -05:00
delayed-inode.c Btrfs: fix lots of orphan inodes when the space is not enough 2013-02-20 09:36:39 -05:00
delayed-inode.h Btrfs: fix lots of orphan inodes when the space is not enough 2013-02-20 09:36:39 -05:00
delayed-ref.c Btrfs: make delayed ref lock logic more readable 2013-02-20 09:36:41 -05:00
delayed-ref.h Btrfs: make delayed ref lock logic more readable 2013-02-20 09:36:41 -05:00
dev-replace.c Btrfs: check the return value of btrfs_start_delalloc_inodes() 2013-02-20 09:37:21 -05:00
dev-replace.h Btrfs: add new sources for device replace code 2012-12-12 17:15:41 -05:00
dir-item.c Btrfs: fix hash overflow handling 2012-12-17 14:48:21 -05:00
disk-io.c Btrfs: record first logical byte in memory 2013-02-20 09:37:18 -05:00
disk-io.h Btrfs: cleanup for btrfs_btree_balance_dirty 2012-12-12 17:15:28 -05:00
export.c ->encode_fh() API change 2012-05-29 23:28:33 -04:00
export.h
extent_io.c Btrfs: use wrapper page_offset 2013-02-20 09:36:43 -05:00
extent_io.h Btrfs: pass fs_info to btrfs_map_block() instead of mapping_tree 2012-12-12 17:15:34 -05:00
extent_map.c Btrfs: do not merge logged extents if we've removed them from the tree 2013-02-05 16:09:03 -05:00
extent_map.h Btrfs: do not allow logged extents to be merged or removed 2013-01-24 12:49:48 -05:00
extent-tree.c Btrfs: make raid attr array more readable 2013-02-20 09:37:19 -05:00
file-item.c Btrfs: put csums on the right ordered extent 2013-01-24 12:51:22 -05:00
file.c Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.h 2013-02-20 09:37:28 -05:00
free-space-cache.c Btrfs: fix panic when recovering tree log 2013-01-24 12:49:49 -05:00
free-space-cache.h btrfs: remove all unused functions 2011-05-06 12:34:03 +02:00
hash.h btrfs: extended inode refs 2012-10-09 09:14:45 -04:00
inode-item.c btrfs: extended inode refs 2012-10-09 09:14:45 -04:00
inode-map.c Btrfs: improve the noflush reservation 2012-12-11 13:31:31 -05:00
inode-map.h Btrfs: Support reading/writing on disk free ino cache 2011-04-25 16:46:11 +08:00
inode.c Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.h 2013-02-20 09:37:28 -05:00
ioctl.c Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.h 2013-02-20 09:37:28 -05:00
Kconfig Btrfs: add config option to enable btrfs integrity check 2011-12-21 19:14:16 +01:00
locking.c Btrfs: save us a read_lock 2013-02-20 09:37:17 -05:00
locking.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
lzo.c btrfs: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:21 +08:00
Makefile Btrfs: add new sources for device replace code 2012-12-12 17:15:41 -05:00
math.h Btrfs: cleanup duplicated division functions 2012-12-11 13:31:30 -05:00
ordered-data.c Btrfs: don't traverse the ordered operation list repeatedly 2013-02-20 09:37:24 -05:00
ordered-data.h Btrfs: wait on ordered extents at the last possible moment 2013-02-20 09:37:04 -05:00
orphan.c btrfs: replace many BUG_ONs with proper error handling 2012-03-22 11:52:54 +01:00
print-tree.c Btrfs: introduce a btrfs_dev_replace_item type 2012-12-12 17:15:38 -05:00
print-tree.h
qgroup.c Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.h 2013-02-20 09:37:28 -05:00
rcu-string.h Btrfs: use rcu to protect device->name 2012-06-14 21:29:16 -04:00
reada.c Btrfs: introduce GET_READ_MIRRORS functionality for btrfs_map_block() 2012-12-12 17:15:43 -05:00
relocation.c Btrfs: use wrapper page_offset 2013-02-20 09:36:43 -05:00
root-tree.c Btrfs: rename root_times_lock to root_item_lock 2012-12-16 20:46:21 -05:00
scrub.c Btrfs: fix race between snapshot deletion and getting inode 2013-02-05 16:09:13 -05:00
send.c Btrfs: fix memory leak in name_cache_insert() 2013-01-14 13:52:30 -05:00
send.h Btrfs: write_buf is now callable outside send.c 2012-10-04 09:39:55 -04:00
struct-funcs.c Btrfs: rewrite BTRFS_SETGET_FUNCS 2012-07-23 16:28:06 -04:00
super.c Btrfs: protect fs_info->alloc_start 2013-02-20 12:59:02 -05:00
sysfs.c btrfs: Remove unused sysfs code 2011-06-17 14:54:18 -04:00
transaction.c Btrfs: check the return value of btrfs_run_ordered_operations() 2013-02-20 09:37:22 -05:00
transaction.h Btrfs: don't re-enter when allocating a chunk 2013-02-20 09:37:09 -05:00
tree-defrag.c btrfs: drop unused parameter from btrfs_release_path 2011-05-02 13:57:22 +02:00
tree-log.c Btrfs: kill unused argument of btrfs_pin_extent_for_log_replay 2013-02-20 09:37:14 -05:00
tree-log.h btrfs: return void in functions without error conditions 2012-03-22 01:45:34 +01:00
ulist.c Btrfs: make aux field of ulist 64 bit 2012-10-01 15:18:53 -04:00
ulist.h Btrfs: make aux field of ulist 64 bit 2012-10-01 15:18:53 -04:00
version.h
volumes.c Btrfs: make raid attr array more readable 2013-02-20 09:37:19 -05:00
volumes.h Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.h 2013-02-20 09:37:28 -05:00
xattr.c Btrfs: only log the inode item if we can get away with it 2012-12-16 20:46:21 -05:00
xattr.h
zlib.c btrfs: fix message printing 2012-10-09 09:19:57 -04:00