Btrfs: Wait for uuid-tree rebuild task on remount read-only
authorStefan Behrens <sbehrens@giantdisaster.de>
Fri, 11 Oct 2013 15:14:58 +0000 (17:14 +0200)
committerChris Mason <chris.mason@fusionio.com>
Tue, 12 Nov 2013 03:01:18 +0000 (22:01 -0500)
commit361c093d7f99c3f6cbb07d5c580ce778ab418c42
treed98d188e9350117d7dcc0a5d08cab65bec0fca08
parent27087f370174ebb298cdf6dcb36b1e4dcbe34e93
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>
fs/btrfs/super.c