From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Wed, 1 Apr 2026 04:05:56 +0000 (+0000)
Subject: f2fs: do not support mmap write for large folio
X-Git-Tag: v7.1-rc1~54^2~1
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1583a7ded0d3d67fd6e7e4336600bc191d068a20;p=thirdparty%2Flinux.git

f2fs: do not support mmap write for large folio

Let's check mmap writes onto the large folio, since we don't support writing
large folios.

Reviewed-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 2c4880f24b54..e917342cb828 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -82,8 +82,17 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
 	int err = 0;
 	vm_fault_t ret;
 
-	if (unlikely(IS_IMMUTABLE(inode)))
+	/*
+	 * We only support large folio on the read case.
+	 * Don't make any dirty pages.
+	 */
+	if (unlikely(IS_IMMUTABLE(inode)) ||
+	    mapping_large_folio_support(inode->i_mapping)) {
+		f2fs_err(sbi, "Not expected: immutable: %d large_folio: %d",
+				IS_IMMUTABLE(inode),
+				mapping_large_folio_support(inode->i_mapping));
 		return VM_FAULT_SIGBUS;
+	}
 
 	if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED)) {
 		err = -EIO;