[PATCH] btrfs: send: propagate errors from is_inode_existent()

[Avi Weiss <thnkslprpt@gmail.com>]

The direct-return refactor in commit b3047a42f55d ("btrfs: send:
directly return from will_overwrite_ref() and simplify it") changed
will_overwrite_ref() to return directly instead of going through the
common out label.

That resulted in a negative return value from is_inode_existent()
to start being converted to 0, making lookup errors unable to be
distinguished from the inode not existing.

process_recorded_refs() expects negative errors from
will_overwrite_ref() and aborts processing when it receives one.

Return the value from is_inode_existent() to restore the previous error
propagation behavior as it was before the refactor.

Fixes: b3047a42f55d ("btrfs: send: directly return from will_overwrite_ref() and simplify it")
Signed-off-by: Avi Weiss <thnkslprpt@gmail.com>
---
 fs/btrfs/send.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 3ae480c7474b..a888202397ed 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -2066,7 +2066,7 @@ static int will_overwrite_ref(struct send_ctx *sctx, u64 dir, u64 dir_gen,
 
 	ret = is_inode_existent(sctx, dir, dir_gen, NULL, &parent_root_dir_gen);
 	if (ret <= 0)
-		return 0;
+		return ret;
 
 	/*
 	 * If we have a parent root we need to verify that the parent dir was

base-commit: af5534fe2fbc006e83d75d6283dfc5ec75d5d780
-- 
2.43.0