From: Christoph Hellwig <hch@lst.de>
Date: Mon, 11 May 2026 07:16:49 +0000 (+0200)
Subject: jfs: handle set_blocksize failures
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=05107f5602751fcfd3d108c1f579eb45aabead52;p=thirdparty%2Fkernel%2Flinux.git

jfs: handle set_blocksize failures

jfs uses buffer_heads, which don't handle block size > PAGE_SIZE well.
Without this, mounting we will hit the

        BUG_ON(offset >= folio_size(folio));

in folio_set_bh on the first __bread_gfp call.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260511071701.2456211-5-hch@lst.de
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
---

diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 61575f7397aea..8180d83d33fed 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -491,7 +491,8 @@ static int jfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	/*
 	 * Initialize blocksize to 4K.
 	 */
-	sb_set_blocksize(sb, PSIZE);
+	if (!sb_set_blocksize(sb, PSIZE))
+		goto out_unload;
 
 	/*
 	 * Set method vectors.