[PATCH 2/2] btrfs-progs: check: fixup_extent_flags needs to deal with non-skinny metadata

[jeffm@suse.com]

From: Jeff Mahoney <jeffm@suse.com>

When repairing a file system created by a very old kernel, I ran into
issues fixing up the extent flags since fixup_extent_flags assumed
that a METADATA_ITEM would be present if the record was for metadata.

Since METADATA_ITEMs don't exist without skinny metadata, we need to
fall back to EXTENT_ITEMs.  This also falls back to EXTENT_ITEMs even
with skinny metadata enabled as other parts of the tools do.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
 check/main.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/check/main.c b/check/main.c
index 7547209c..4a27a443 100644
--- a/check/main.c
+++ b/check/main.c
@@ -7540,9 +7540,13 @@ static int fixup_extent_flags(struct btrfs_fs_info *fs_info,
 	struct btrfs_key key;
 	u64 flags;
 	int ret = 0;
+	bool metadata_item = rec->metadata;
 
+	if (!btrfs_fs_incompat(root->fs_info, SKINNY_METADATA))
+		metadata_item = false;
+retry:
 	key.objectid = rec->start;
-	if (rec->metadata) {
+	if (metadata_item) {
 		key.type = BTRFS_METADATA_ITEM_KEY;
 		key.offset = rec->info_level;
 	} else {
@@ -7561,6 +7565,10 @@ static int fixup_extent_flags(struct btrfs_fs_info *fs_info,
 		btrfs_commit_transaction(trans, root);
 		return ret;
 	} else if (ret) {
+		if (key.type == BTRFS_METADATA_ITEM_KEY) {
+			metadata_item = false;
+			goto retry;
+		}
 		fprintf(stderr, "Didn't find extent for %llu\n",
 			(unsigned long long)rec->start);
 		btrfs_release_path(&path);
-- 
2.16.4