Re: [f2fs-dev] [PATCH v2] f2fs: another way to set large folio by remembering inode number

[Chao Yu <chao@kernel.org>]

On 4/10/2026 9:16 AM, Jaegeuk Kim via Linux-f2fs-devel wrote:
> enum {
>         F2FS_XATTR_FADV_LARGEFOLIO,
> };
> 
> unsigned int value = BIT(F2FS_XATTR_FADV_LARGEFOLIO);
> 
> 1. setxattr(file, "user.fadvise", &value, sizeof(unsigned int), 0)
>   -> register the inode number for large folio
> 2. chmod(0400, file)
>   -> make Read-Only
> 3. fsync() && close() && open(READ)
>   -> f2fs_iget() with large folio
> 4. open(WRITE), mkwrite on mmap, chmod(WRITE)
>   -> return error
> 5. close() and open()
>   -> goto #3
> 6. unlink
>   -> deregister the inode number
> 
> Suggested-by: Akilesh Kailash <akailash@google.com>
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Reviewed-by: Chao Yu <chao@kernel.org>

Thanks,