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Btrfs: reclaim delalloc metadata more aggressively

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generic/074 in xfstests failed sometimes because of the enospc error,
the reason of this problem is that we just reclaimed the space we need
from the reserved space for delalloc, and then tried to reserve the space,
but if some task did no-flush reservation between the above reclamation
and reservation,
	Task1			Task2
	shrink_delalloc()
	reclaim 1 block
	(The space that can
	 be reserved now is 1
	 block)
				do no-flush reservation
				reserve 1 block
				(The space that can
				 be reserved now is 0
				 block)
	reserving 1 block failed
the reservation of Task1 failed, but in fact, there was enough space to
reserve if we could reclaim more space before.

Fix this problem by the aggressive reclamation of the reserved delalloc
metadata space.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
This commit is contained in:
Miao Xie 2014-03-06 13:55:00 +08:00 committed by Josef Bacik
parent 0424c54897
commit 24af7dd188
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/extent-tree.c
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@ -4174,7 +4174,7 @@ static int flush_space(struct btrfs_root *root,
break;
case FLUSH_DELALLOC:
case FLUSH_DELALLOC_WAIT:
shrink_delalloc(root, num_bytes, orig_bytes,
shrink_delalloc(root, num_bytes * 2, orig_bytes,
state == FLUSH_DELALLOC_WAIT);
break;
case ALLOC_CHUNK: