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

Jaegeuk Kim via Linux-f2fs-devel
2026-04-08T18:13:26Z

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

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

- 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