linux-kernel - [PATCH] btrfs: Accept and ignore compression level for lzo

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Message-ID: <a5e0515b8c558f03ba2a9613c736d65f2b36b5fe.1755848139.git.calvin@wbinvd.org>
Date: Fri, 22 Aug 2025 00:45:31 -0700
From: Calvin Owens <calvin@...nvd.org>
To: linux-kernel@...r.kernel.org
Cc: linux-btrfs@...r.kernel.org,
	Daniel Vacek <neelx@...e.com>,
	David Sterba <dsterba@...e.com>,
	Josef Bacik <josef@...icpanda.com>,
	Chris Mason <clm@...com>
Subject: [PATCH] btrfs: Accept and ignore compression level for lzo

The compression level is meaningless for lzo, but before commit
3f093ccb95f30 ("btrfs: harden parsing of compression mount options"),
it was silently ignored if passed.

After that commit, passing a level with lzo fails to mount:

    BTRFS error: unrecognized compression value lzo:1

Restore the old behavior, in case any users were relying on it.

Fixes: 3f093ccb95f30 ("btrfs: harden parsing of compression mount options")
Signed-off-by: Calvin Owens <calvin@...nvd.org>
---
 fs/btrfs/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index a262b494a89f..7ee35038c7fb 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -299,7 +299,7 @@ static int btrfs_parse_compress(struct btrfs_fs_context *ctx,
 		btrfs_set_opt(ctx->mount_opt, COMPRESS);
 		btrfs_clear_opt(ctx->mount_opt, NODATACOW);
 		btrfs_clear_opt(ctx->mount_opt, NODATASUM);
-	} else if (btrfs_match_compress_type(string, "lzo", false)) {
+	} else if (btrfs_match_compress_type(string, "lzo", true)) {
 		ctx->compress_type = BTRFS_COMPRESS_LZO;
 		ctx->compress_level = 0;
 		btrfs_set_opt(ctx->mount_opt, COMPRESS);
-- 
2.47.2