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

[Jaegeuk Kim <jaegeuk@kernel.org>]

On 04/06, Christoph Hellwig wrote:
> On Mon, Apr 06, 2026 at 03:49:40PM +0000, Jaegeuk Kim wrote:
> > Let's check mmmap writes onto the large folio.
> 
> Why?  And how is this not breaking applications?

Since we only support the large folio on the read case.

> 
> > 
> > Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> > ---
> >  fs/f2fs/file.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > index 2c4880f24b54..edfc3a374c40 100644
> > --- a/fs/f2fs/file.c
> > +++ b/fs/f2fs/file.c
> > @@ -82,7 +82,7 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
> >  	int err = 0;
> >  	vm_fault_t ret;
> >  
> > -	if (unlikely(IS_IMMUTABLE(inode)))
> > +	if (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
> > 
> > 
> ---end quoted text---