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Btrfs: don't do async reclaim during log replay

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Trying to reproduce a log enospc bug I hit a panic in the async reclaim code
during log replay.  This is because we use fs_info->fs_root as our root for
shrinking and such.  Technically we can use whatever root we want, but let's
just not allow async reclaim while we're doing log replay.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Josef Bacik 2014-09-18 11:27:17 -04:00 committed by Chris Mason
parent 47ab2a6c68
commit f6acfd5011
1 changed files with 7 additions and 1 deletions
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8
fs/btrfs/extent-tree.c
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@ -4513,7 +4513,13 @@ static int reserve_metadata_bytes(struct btrfs_root *root,
space_info->flush = 1;
} else if (!ret && space_info->flags & BTRFS_BLOCK_GROUP_METADATA) {
used += orig_bytes;
if (need_do_async_reclaim(space_info, root->fs_info, used) &&
/*
* We will do the space reservation dance during log replay,
* which means we won't have fs_info->fs_root set, so don't do
* the async reclaim as we will panic.
*/
if (!root->fs_info->log_root_recovering &&
need_do_async_reclaim(space_info, root->fs_info, used) &&
!work_busy(&root->fs_info->async_reclaim_work))
queue_work(system_unbound_wq,
&root->fs_info->async_reclaim_work);