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btrfs: handle errors from select_reloc_root()

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Currently select_reloc_root() doesn't return an error, but followup
patches will make it possible for it to return an error.  We do have
proper error recovery in do_relocation however, so handle the
possibility of select_reloc_root() having an error properly instead of
BUG_ON(!root).

I've also adjusted select_reloc_root() to return ERR_PTR(-ENOENT) if we
don't find a root, instead of NULL, to make the error case easier to
deal with.  I've replaced the BUG_ON(!root) with an ASSERT(0) for this
case as it indicates we messed up the backref walking code, but it could
also indicate corruption.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2021-03-12 15:24:58 -05:00 committed by David Sterba
parent 1c7bfa159f
commit cbdc2ebc7c
1 changed files with 12 additions and 3 deletions
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15
fs/btrfs/relocation.c
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@ -2024,8 +2024,14 @@ struct btrfs_root *select_reloc_root(struct btrfs_trans_handle *trans,
if (!next || next->level <= node->level)
break;
}
if (!root)
return NULL;
if (!root) {
/*
* This can happen if there's fs corruption or if there's a bug
* in the backref lookup code.
*/
ASSERT(0);
return ERR_PTR(-ENOENT);
}
next = node;
/* setup backref node path for btrfs_reloc_cow_block */
@ -2196,7 +2202,10 @@ static int do_relocation(struct btrfs_trans_handle *trans,
upper = edge->node[UPPER];
root = select_reloc_root(trans, rc, upper, edges);
BUG_ON(!root);
if (IS_ERR(root)) {
ret = PTR_ERR(root);
goto next;
}
if (upper->eb && !upper->locked) {
if (!lowest) {