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btrfs: handle errors in reference count manipulation in replace_path 

If any of the reference count manipulation stuff fails in replace_path
we need to abort the transaction, as we've modified the blocks already.
We can simply break at this point and everything will be cleaned up.

Reviewed-by: Qu Wenruo <wqu@suse.com>
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 15:25:24 -05:00 committed by David Sterba
parent 0e9873e2fe
commit 253e258c34
1 changed files with 16 additions and 4 deletions
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20
fs/btrfs/relocation.c
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@ -1367,27 +1367,39 @@ int replace_path(struct btrfs_trans_handle *trans, struct reloc_control *rc,
ref.skip_qgroup = true;
btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid);
ret = btrfs_inc_extent_ref(trans, &ref);
BUG_ON(ret);
if (ret) {
btrfs_abort_transaction(trans, ret);
break;
}
btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr,
blocksize, 0);
ref.skip_qgroup = true;
btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid);
ret = btrfs_inc_extent_ref(trans, &ref);
BUG_ON(ret);
if (ret) {
btrfs_abort_transaction(trans, ret);
break;
}
btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, new_bytenr,
blocksize, path->nodes[level]->start);
btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid);
ref.skip_qgroup = true;
ret = btrfs_free_extent(trans, &ref);
BUG_ON(ret);
if (ret) {
btrfs_abort_transaction(trans, ret);
break;
}
btrfs_init_generic_ref(&ref, BTRFS_DROP_DELAYED_REF, old_bytenr,
blocksize, 0);
btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid);
ref.skip_qgroup = true;
ret = btrfs_free_extent(trans, &ref);
BUG_ON(ret);
if (ret) {
btrfs_abort_transaction(trans, ret);
break;
}
btrfs_unlock_up_safe(path, 0);