btrfs: tree-checker: check for overlapping extent items

We're seeing a weird problem in production where we have overlapping
extent items in the extent tree.  It's unclear where these are coming
from, and in debugging we realized there's no check in the tree checker
for this sort of problem.  Add a check to the tree-checker to make sure
that the extents do not overlap each other.

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>

diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index 9e0e0ae2288cd4c89d298d45b04f417a4da77a50..43f905ab0a18d97cdec6d1255536b043891949f0 100644 (file)
--- a/fs/btrfs/tree-checker.c
+++ b/fs/btrfs/tree-checker.c
@@ -1233,7 +1233,8 @@ static void extent_err(const struct extent_buffer *eb, int slot,
 }
 
 static int check_extent_item(struct extent_buffer *leaf,
-                            struct btrfs_key *key, int slot)
+                            struct btrfs_key *key, int slot,
+                            struct btrfs_key *prev_key)
 {
        struct btrfs_fs_info *fs_info = leaf->fs_info;
        struct btrfs_extent_item *ei;
@@ -1453,6 +1454,26 @@ static int check_extent_item(struct extent_buffer *leaf,
                           total_refs, inline_refs);
                return -EUCLEAN;
        }
+
+       if ((prev_key->type == BTRFS_EXTENT_ITEM_KEY) ||
+           (prev_key->type == BTRFS_METADATA_ITEM_KEY)) {
+               u64 prev_end = prev_key->objectid;
+
+               if (prev_key->type == BTRFS_METADATA_ITEM_KEY)
+                       prev_end += fs_info->nodesize;
+               else
+                       prev_end += prev_key->offset;
+
+               if (unlikely(prev_end > key->objectid)) {
+                       extent_err(leaf, slot,
+       "previous extent [%llu %u %llu] overlaps current extent [%llu %u %llu]",
+                                  prev_key->objectid, prev_key->type,
+                                  prev_key->offset, key->objectid, key->type,
+                                  key->offset);
+                       return -EUCLEAN;
+               }
+       }
+
        return 0;
 }
 
@@ -1621,7 +1642,7 @@ static int check_leaf_item(struct extent_buffer *leaf,
                break;
        case BTRFS_EXTENT_ITEM_KEY:
        case BTRFS_METADATA_ITEM_KEY:
-               ret = check_extent_item(leaf, key, slot);
+               ret = check_extent_item(leaf, key, slot, prev_key);
                break;
        case BTRFS_TREE_BLOCK_REF_KEY:
        case BTRFS_SHARED_DATA_REF_KEY: