btrfs: replace many BUG_ONs with proper error handling
btrfs currently handles most errors with BUG_ON. This patch is a work-in-
progress but aims to handle most errors other than internal logic
errors and ENOMEM more gracefully.
This iteration prevents most crashes but can run into lockups with
the page lock on occasion when the timing "works out."
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index ecbcc87..054707e 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -230,11 +230,13 @@
if (ret) {
trans->block_rsv = rsv;
- WARN_ON(1);
+ btrfs_abort_transaction(trans, root, ret);
return ret;
}
ret = btrfs_update_inode(trans, root, inode);
+ if (ret)
+ btrfs_abort_transaction(trans, root, ret);
trans->block_rsv = rsv;
return ret;
@@ -1948,14 +1950,14 @@
*/
ret = btrfs_add_free_space(block_group, old_start,
offset - old_start);
- WARN_ON(ret);
+ WARN_ON(ret); /* -ENOMEM */
goto out;
}
ret = remove_from_bitmap(ctl, info, &offset, &bytes);
if (ret == -EAGAIN)
goto again;
- BUG_ON(ret);
+ BUG_ON(ret); /* logic error */
out_lock:
spin_unlock(&ctl->tree_lock);
out:
@@ -2346,7 +2348,7 @@
rb_erase(&entry->offset_index, &ctl->free_space_offset);
ret = tree_insert_offset(&cluster->root, entry->offset,
&entry->offset_index, 1);
- BUG_ON(ret);
+ BUG_ON(ret); /* -EEXIST; Logic error */
trace_btrfs_setup_cluster(block_group, cluster,
total_found * block_group->sectorsize, 1);
@@ -2439,7 +2441,7 @@
ret = tree_insert_offset(&cluster->root, entry->offset,
&entry->offset_index, 0);
total_size += entry->bytes;
- BUG_ON(ret);
+ BUG_ON(ret); /* -EEXIST; Logic error */
} while (node && entry != last);
cluster->max_size = max_extent;
@@ -2830,6 +2832,7 @@
int ret;
ret = search_bitmap(ctl, entry, &offset, &count);
+ /* Logic error; Should be empty if it can't find anything */
BUG_ON(ret);
ino = offset;