[PATCH 6/6] btrfs: check return value of btrfs_partially_delete_raid_extent()

[robbieko <robbieko@synology.com>]

btrfs_partially_delete_raid_extent() returns an error code (e.g.
-ENOMEM from kzalloc, or errors from btrfs_del_item/btrfs_insert_item),
but all three call sites in btrfs_delete_raid_extent() discard the
return value, silently losing errors and potentially leaving the stripe
tree in an inconsistent state.

Fix by capturing the return value into ret at all three call sites and
breaking out of the loop on error where appropriate.

Signed-off-by: robbieko <robbieko@synology.com>
---
 fs/btrfs/raid-stripe-tree.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/fs/btrfs/raid-stripe-tree.c b/fs/btrfs/raid-stripe-tree.c
index 1e8392a6c5a4..22327f483311 100644
--- a/fs/btrfs/raid-stripe-tree.c
+++ b/fs/btrfs/raid-stripe-tree.c
@@ -223,8 +223,9 @@ int btrfs_delete_raid_extent(struct btrfs_trans_handle *trans, u64 start, u64 le
 			/* The "left" item. */
 			path->slots[0]--;
 			btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
-			btrfs_partially_delete_raid_extent(trans, path, &key,
-							   diff_start, 0);
+			ret = btrfs_partially_delete_raid_extent(trans, path,
+								 &key,
+								 diff_start, 0);
 			break;
 		}
 
@@ -240,8 +241,11 @@ int btrfs_delete_raid_extent(struct btrfs_trans_handle *trans, u64 start, u64 le
 		if (found_start < start) {
 			u64 diff_start = start - found_start;
 
-			btrfs_partially_delete_raid_extent(trans, path, &key,
-							   diff_start, 0);
+			ret = btrfs_partially_delete_raid_extent(trans, path,
+								 &key,
+								 diff_start, 0);
+			if (ret)
+				break;
 
 			start += (key.offset - diff_start);
 			length -= (key.offset - diff_start);
@@ -264,9 +268,10 @@ int btrfs_delete_raid_extent(struct btrfs_trans_handle *trans, u64 start, u64 le
 		if (found_end > end) {
 			u64 diff_end = found_end - end;
 
-			btrfs_partially_delete_raid_extent(trans, path, &key,
-							   key.offset - length,
-							   length);
+			ret = btrfs_partially_delete_raid_extent(trans, path,
+								 &key,
+								 key.offset - length,
+								 length);
 			ASSERT(key.offset - diff_end == length);
 			break;
 		}
-- 
2.43.0


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