Re: [PATCH] fuse: show io_uring mount option in /proc/mounts

[Long Li <leo.lilong@huawei.com>]

On Wed, Jul 09, 2025 at 01:00:05PM +0200, Bernd Schubert wrote:
> 
> 
> On 7/9/25 04:02, leo.lilong@huaweicloud.com wrote:
> > From: Long Li <leo.lilong@huawei.com>
> > 
> > When mounting a FUSE filesystem with io_uring option and using io_uring
> > for communication, this option was not shown in /proc/mounts or mount
> > command output. This made it difficult for users to verify whether
> > io_uring was being used for communication in their FUSE mounts.
> > 
> > Add io_uring to the list of mount options displayed in fuse_show_options()
> > when the fuse-over-io_uring feature is enabled and being used.
> > 
> > Signed-off-by: Long Li <leo.lilong@huawei.com>
> > ---
> >  fs/fuse/inode.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
> > index ecb869e895ab..a6a8cd84fdde 100644
> > --- a/fs/fuse/inode.c
> > +++ b/fs/fuse/inode.c
> > @@ -913,6 +913,8 @@ static int fuse_show_options(struct seq_file *m, struct dentry *root)
> >  			seq_puts(m, ",default_permissions");
> >  		if (fc->allow_other)
> >  			seq_puts(m, ",allow_other");
> > +		if (fc->io_uring)
> > +			seq_puts(m, ",io_uring");
> >  		if (fc->max_read != ~0)
> >  			seq_printf(m, ",max_read=%u", fc->max_read);
> >  		if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
> 
> I agree with you that is impossible to see, but issue is that io_uring
> is not a mount option. Maybe we should add a sysfs file?
> 

Yes, this is not a mount option. Thank you for your suggestion.

Thanks,
Long Li