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361c093d7f
linux/fs/btrfs
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Stefan Behrens 361c093d7f Btrfs: Wait for uuid-tree rebuild task on remount read-only 
If the user remounts the filesystem read-only while the uuid-tree
scan and rebuild task is still running (this happens once after the
filesystem was mounted with an old kernel, or when forced with the
mount options), the remount should wait on the tasks completion
before setting the filesystem read-only. Otherwise the background
task continues to write to the filesystem which is apparently not
what users expect.

The reproducer:

TEST_DEV=/dev/sdzzzzz1
TEST_MNT=/mnt
mkfs.btrfs -f $TEST_DEV
mount $TEST_DEV $TEST_MNT
for i in `seq 50000`; do btrfs subvolume create ${TEST_MNT}/$i; done
umount $TEST_MNT
mount $TEST_DEV $TEST_MNT -o rescan_uuid_tree
sleep 1
ps -elf | fgrep '[btrfs-uuid]' | grep -v grep
mount $TEST_DEV $TEST_MNT -o ro,remount
ps -elf | fgrep '[btrfs-uuid]' | grep -v grep
sleep 1
umount $TEST_MNT

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-11-11 22:01:18 -05:00
..
tests Btrfs: add a sanity test for a vacant extent at the front of a file 2013-11-11 21:58:19 -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: eliminate races in worker stopping code 2013-10-04 16:02:13 -04:00
async-thread.h Btrfs: eliminate races in worker stopping code 2013-10-04 16:02:13 -04:00
backref.c btrfs: drop unused parameter from btrfs_item_nr 2013-11-11 21:50:48 -05:00
backref.h Btrfs: allocate prelim_ref with a slab allocater 2013-09-01 08:16:27 -04:00
btrfs_inode.h Btrfs: improve inode hash function/inode lookup 2013-11-11 21:55:19 -05:00
check-integrity.c Btrfs: Use %z to format size_t 2013-09-01 08:16:19 -04:00
check-integrity.h
compat.h
compression.c Btrfs: Remove superfluous casts from u64 to unsigned long long 2013-09-01 08:16:08 -04:00
compression.h btrfs: make static code static & remove dead code 2013-05-06 15:55:23 -04:00
ctree.c Btrfs: kill unused code in btrfs_search_forward 2013-11-11 21:59:56 -05:00
ctree.h Btrfs: add tests for btrfs_get_extent 2013-11-11 21:57:30 -05:00
delayed-inode.c Btrfs: fix printing of non NULL terminated string 2013-09-01 08:16:20 -04:00
delayed-inode.h [readdir] convert btrfs 2013-06-29 12:57:00 +04:00
delayed-ref.c Btrfs: get rid of sparse warnings 2013-09-01 08:15:50 -04:00
delayed-ref.h Btrfs: handle running extent ops with skinny metadata 2013-05-17 21:40:15 -04:00
dev-replace.c Btrfs: disallow 'btrfs {balance,replace} cancel' on ro mounts 2013-11-11 22:00:50 -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: drop unused parameter from btrfs_item_nr 2013-11-11 21:50:48 -05:00
disk-io.c Btrfs: Simplify the logic in alloc_extent_buffer() for existing extent buffer case 2013-11-11 21:59:11 -05:00
disk-io.h Btrfs: add a sanity test for btrfs_split_item 2013-11-11 21:51:02 -05:00
export.c Btrfs: cleanup: don't check the same thing twice 2013-06-14 11:29:30 -04:00
export.h
extent_io.c Btrfs: Simplify the logic in alloc_extent_buffer() for existing extent buffer case 2013-11-11 21:59:11 -05:00
extent_io.h Btrfs: Simplify the logic in alloc_extent_buffer() for existing extent buffer case 2013-11-11 21:59:11 -05:00
extent_map.c btrfs: make static code static & remove dead code 2013-05-06 15:55:23 -04:00
extent_map.h Btrfs: fix bad extent logging 2013-05-06 15:54:34 -04:00
extent-tree.c Btrfs: fixup error path in __btrfs_inc_extent_ref 2013-11-11 22:01:00 -05:00
file-item.c Btrfs: add an assert to btrfs_lookup_csums_range for alignment 2013-11-11 21:58:45 -05:00
file.c Btrfs: fix up seek_hole/seek_data handling 2013-11-11 21:58:56 -05:00
free-space-cache.c Btrfs: remove path arg from btrfs_truncate_free_space_cache 2013-11-11 21:51:33 -05:00
free-space-cache.h Btrfs: remove path arg from btrfs_truncate_free_space_cache 2013-11-11 21:51:33 -05:00
hash.h
inode-item.c btrfs: drop unused parameter from btrfs_item_nr 2013-11-11 21:50:48 -05:00
inode-map.c Btrfs: remove path arg from btrfs_truncate_free_space_cache 2013-11-11 21:51:33 -05:00
inode-map.h
inode.c Btrfs: handle a missing extent for the first file extent 2013-11-11 21:58:05 -05:00
ioctl.c Btrfs: don't leak ioctl args in btrfs_ioctl_dev_replace 2013-11-11 22:00:37 -05:00
Kconfig Btrfs: add support for asserts 2013-09-01 08:16:32 -04:00
locking.c btrfs: make static code static & remove dead code 2013-05-06 15:55:23 -04:00
locking.h Btrfs: remove btrfs_try_spin_lock 2013-03-14 14:57:10 -04:00
lzo.c Btrfs: return -1 when lzo compression makes data bigger 2013-09-01 07:57:19 -04:00
Makefile Btrfs: add tests for btrfs_get_extent 2013-11-11 21:57:30 -05:00
math.h Btrfs: cleanup duplicated division functions 2012-12-11 13:31:30 -05:00
ordered-data.c Btrfs: kill delay_iput arg to the wait_ordered functions 2013-09-21 11:05:27 -04:00
ordered-data.h Btrfs: kill delay_iput arg to the wait_ordered functions 2013-09-21 11:05:27 -04:00
orphan.c
print-tree.c btrfs: drop unused parameter from btrfs_item_nr 2013-11-11 21:50:48 -05:00
print-tree.h btrfs: make static code static & remove dead code 2013-05-06 15:55:23 -04:00
qgroup.c Btrfs: Remove superfluous casts from u64 to unsigned long long 2013-09-01 08:16:08 -04:00
raid56.c Btrfs, raid56: fix memory leak when allocating pages for p/q stripes failed 2013-09-01 08:04:27 -04:00
raid56.h Btrfs: RAID5 and RAID6 2013-02-01 14:24:23 -05:00
rcu-string.h
reada.c Btrfs: fix reada debug code compilation 2013-05-06 15:54:55 -04:00
relocation.c Btrfs: fix BUG_ON() casued by the reserved space migration 2013-11-11 21:54:28 -05:00
root-tree.c Btrfs: insert orphan roots into fs radix tree 2013-10-10 21:30:53 -04:00
scrub.c Btrfs: fix the dev-replace suspend sequence 2013-11-11 21:55:36 -05:00
send.c btrfs: drop unused parameter from btrfs_item_nr 2013-11-11 21:50:48 -05:00
send.h btrfs: make static code static & remove dead code 2013-05-06 15:55:23 -04:00
struct-funcs.c
super.c Btrfs: Wait for uuid-tree rebuild task on remount read-only 2013-11-11 22:01:18 -05:00
sysfs.c btrfs: fixup/remove module.h usage as required 2013-03-01 15:01:01 -05:00
transaction.c Btrfs: fix memory leaks on transaction commit failure 2013-11-11 21:55:46 -05:00
transaction.h Btrfs: fix BUG_ON() casued by the reserved space migration 2013-11-11 21:54:28 -05:00
tree-defrag.c Btrfs: cleanup dead code of defragment 2013-11-11 21:59:45 -05:00
tree-log.c btrfs: Fix memory leakage in the tree-log.c 2013-11-11 22:00:11 -05:00
tree-log.h btrfs: make static code static & remove dead code 2013-05-06 15:55:23 -04:00
ulist.c Btrfs: fix crash regarding to ulist_add_merge 2013-07-02 11:50:59 -04:00
ulist.h Btrfs: add a rb_tree to improve performance of ulist search 2013-05-06 15:54:44 -04:00
uuid-tree.c Btrfs: remove unused max_key arg from btrfs_search_forward 2013-11-11 21:54:57 -05:00
volumes.c Btrfs: init device stats for new devices 2013-11-11 22:01:09 -05:00
volumes.h Btrfs: add btrfs_alloc_device and switch to it 2013-09-01 08:16:04 -04:00
xattr.c btrfs: make static code static & remove dead code 2013-05-06 15:55:23 -04:00
xattr.h
zlib.c btrfs: fix message printing 2012-10-09 09:19:57 -04:00