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Btrfs: fix deadlock caused by the race between relocation

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We can not do flushable reservation for the relocation when we create snapshot,
because it may make the transaction commit task and the flush task wait for
each other and the deadlock happens.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Miao Xie 2011-11-10 20:45:05 -05:00 committed by Chris Mason
parent 2f120c05e6
commit 62f30c5462
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/transaction.c
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@ -882,8 +882,8 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
btrfs_reloc_pre_snapshot(trans, pending, &to_reserve);
if (to_reserve > 0) {
ret = btrfs_block_rsv_add(root, &pending->block_rsv,
to_reserve);
ret = btrfs_block_rsv_add_noflush(root, &pending->block_rsv,
to_reserve);
if (ret) {
pending->error = ret;
goto fail;