Re: [f2fs-dev] [PATCH] f2fs: expose resizable_tail feature via sysfs

[Chao Yu]

On 10/14/26 23:21, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@xxxxxxxxxx>
> 
> Userspace has no way to know whether the kernel supports the
> resizable_tail_secno mount option before mounting. Passing it to a
> kernel without the support fails the mount with -EINVAL, and checking
> /sys/fs/f2fs/<disk>/pinned_area_max_secno requires an f2fs instance
> to be mounted already.
> 
> Export /sys/fs/f2fs/features/resizable_tail so that userspace can check
> the support before formatting or mounting a filesystem that relies on
> resizable_tail_secno, e.g. a filesystem whose tail is going to be shrunk
> online later.
> 
> Fixes: c966d29e01bb ("f2fs: support resizable tail section and unify pinned allocation")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Daeho Jeong <daehojeong@xxxxxxxxxx>
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>

Thanks,