From: Christoph Hellwig <hch@lst.de>
Date: Mon, 11 May 2026 07:16:48 +0000 (+0200)
Subject: qnx4: handle set_blocksize failures
X-Git-Url: http://git.ipfire.org/gitweb/index.cgi?a=commitdiff_plain;h=c7d911ea1cc9a63b07e52f5e75b263be0615b289;p=thirdparty%2Fkernel%2Flinux.git

qnx4: handle set_blocksize failures

qnx4 uses buffer_heads, which don't handle block size > PAGE_SIZE well.
Without this, mounting 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/20260511071701.2456211-4-hch@lst.de
Acked-by: Anders Larsen <al@alarsen.net>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
---

diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c
index 4deb0eeadbdef..42fcd500fad21 100644
--- a/fs/qnx4/inode.c
+++ b/fs/qnx4/inode.c
@@ -202,7 +202,8 @@ static int qnx4_fill_super(struct super_block *s, struct fs_context *fc)
 		return -ENOMEM;
 	s->s_fs_info = qs;
 
-	sb_set_blocksize(s, QNX4_BLOCK_SIZE);
+	if (!sb_set_blocksize(s, QNX4_BLOCK_SIZE))
+		return -EINVAL;
 
 	s->s_op = &qnx4_sops;
 	s->s_magic = QNX4_SUPER_MAGIC;