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authorJosef Bacik <josef@toxicpanda.com>2022-08-03 21:28:47 +0300
committerDavid Sterba <dsterba@suse.com>2022-08-17 17:20:25 +0300
commit899b7f69f244e539ea5df1b4d756046337de44a5 (patch)
tree015ce4660196b8caad61036c09b22293d443578b /fs
parent769030e11847c5412270c0726ff21d3a1f0a3131 (diff)
downloadlinux-899b7f69f244e539ea5df1b4d756046337de44a5.tar.xz
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/tree-checker.c25
1 files changed, 23 insertions, 2 deletions
diff --git a/fs/btrfs/tree-checker.c b/fs/btrfs/tree-checker.c
index 9e0e0ae2288c..43f905ab0a18 100644
--- 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: