Re: [PATCH v4] f2fs: do not support mmap write for large folio
From: Jaegeuk Kim
Date: Mon Apr 13 2026 - 18:46:37 EST
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>
---
- add f2fs_err to catch any issue
fs/f2fs/file.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
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;
--
2.54.0.rc0.605.g598a273b03-goog