Re: [PATCH v3] f2fs: do not support mmap write for large folio

[Jaegeuk Kim]

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

Reviewed-by: Daeho Jeong <daehojeong@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---

 - log v2:
  : add comments 

 fs/f2fs/file.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 2c4880f24b54..c0220cd7b332 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -82,7 +82,12 @@ 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))
 		return VM_FAULT_SIGBUS;
 
 	if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED)) {
-- 
2.53.0.1213.gd9a14994de-goog