[PATCH 1/2] btrfs: fix the incorrect freeing of a compression folio in btrfs_submit_compressed_read()

[Qu Wenruo <wqu@suse.com>]

[BUG]
Commit dafcfa1c8e37 ("btrfs: get rid of compressed_folios[] usage for
compressed read") changed how we allocate folios for a compressed read.

Previously we allocate an array of folios for the compressed read.
But now we require all folios to be allocated and freed by
btrfs_alloc_compr_folios() and btrfs_free_compr_folios() to use the
cached folio pool.

Unfortunately we only use btrfs_alloc_compr_folio() but not pairing it
with btrfs_free_compr_folio().

This can lead to problems as a compr folio has maintained its own RCU
list, not releasing it from the RCU list can lead to various problems.

[FIX]
Use btrfs_free_compr_folio() to replace the regular folio_put() call.

Fixes: dafcfa1c8e37 ("btrfs: get rid of compressed_folios[] usage for compressed read")
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 fs/btrfs/compression.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 192f133d9eb5..dd004b1cc4ef 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -576,7 +576,7 @@ void btrfs_submit_compressed_read(struct btrfs_bio *bbio)
 
 		ret = bio_add_folio(&cb->bbio.bio, folio, cur_len, 0);
 		if (unlikely(!ret)) {
-			folio_put(folio);
+			btrfs_free_compr_folio(folio);
 			ret = -EINVAL;
 			goto out_free_bio;
 		}
-- 
2.53.0