diff options
| author | Josef Bacik <josef@toxicpanda.com> | 2021-03-12 23:25:32 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2021-04-19 18:25:22 +0300 |
| commit | 8717cf440db670ba87596d8f5f6660d2a94f4401 (patch) | |
| tree | e64a920d111adc17af8f9311e99af1cb2022aced /fs/btrfs | |
| parent | e0b085b0b03fa5c435b7240668f144199ed989c4 (diff) | |
| download | linux-8717cf440db670ba87596d8f5f6660d2a94f4401.tar.xz | |
btrfs: handle extent corruption with select_one_root properly
In corruption cases we could have paths from a block up to no root at
all, and thus we'll BUG_ON(!root) in select_one_root. Handle this by
adding an ASSERT() for developers, and returning an error for normal
users.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/relocation.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index 01c393757721..3b9c9a001d0d 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -2218,7 +2218,13 @@ struct btrfs_root *select_one_root(struct btrfs_backref_node *node) cond_resched(); next = walk_up_backref(next, edges, &index); root = next->root; - BUG_ON(!root); + + /* + * This can occur if we have incomplete extent refs leading all + * the way up a particular path, in this case return -EUCLEAN. + */ + if (!root) + return ERR_PTR(-EUCLEAN); /* No other choice for non-shareable tree */ if (!test_bit(BTRFS_ROOT_SHAREABLE, &root->state)) @@ -2608,8 +2614,15 @@ static int relocate_tree_block(struct btrfs_trans_handle *trans, BUG_ON(node->processed); root = select_one_root(node); - if (root == ERR_PTR(-ENOENT)) { - update_processed_blocks(rc, node); + if (IS_ERR(root)) { + ret = PTR_ERR(root); + + /* See explanation in select_one_root for the -EUCLEAN case. */ + ASSERT(ret == -ENOENT); + if (ret == -ENOENT) { + ret = 0; + update_processed_blocks(rc, node); + } goto out; } |