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btrfs: raid56: properly handle the error when unable to find the missing stripe

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In raid56_alloc_missing_rbio(), if we can not determine where the
missing device is inside the full stripe, we just BUG_ON().

This is not necessary especially the only caller inside scrub.c is
already properly checking the return value, and will treat it as a
memory allocation failure.

Fix the error handling by:

- Add an extra warning for the reason
  Although personally speaking it may be better to be an ASSERT().

- Properly free the allocated rbio

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo
2022-10-10 18:36:06 +08:00
committed by David Sterba
parent 4efb365a3f
commit f15fb2cd97
1 changed files with 4 additions and 2 deletions
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6
fs/btrfs/raid56.c
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@@ -2742,8 +2742,10 @@ raid56_alloc_missing_rbio(struct bio *bio, struct btrfs_io_context *bioc)
rbio->faila = find_logical_bio_stripe(rbio, bio);
if (rbio->faila == -1) {
BUG();
kfree(rbio);
btrfs_warn_rl(fs_info,
"can not determine the failed stripe number for full stripe %llu",
bioc->raid_map[0]);
__free_raid_bio(rbio);
return NULL;
}