Re: [patch 4/8] fs, exportfs: Add export_encode_inode_fh helper

[Cyrill Gorcunov <gorcunov@openvz.org>]

On Thu, Aug 23, 2012 at 10:54:44AM +0200, Marco Stornelli wrote:
> >>For brtfs
> >>
> >>	objectid = fid->objectid;
> >>	root_objectid = fid->root_objectid;
> >>	generation = fid->gen;
> >>
> >>	return btrfs_get_dentry(sb, objectid, root_objectid, generation, 1);
> >
> >For btrfs it become more complex. But still the last version I'm about
> >to send for review today (once everything get tested) will provide
> >fhandle carried with inotify mark _and_ inode number and device. This
> >information should be enough for us. After all having inode and device
> >should allow us to figure out the fs used on inotify target.
> 
> Sorry if it's a really stupid question but I didn't follow deeply
> the thread. How can you provide a device if the fs is mounted on
> "none" (ex tmpfs)? In this case you can't associate device <=> fs,
> because you haven't got a /dev/something.

That's ::s_dev from superblock, together with parsing /proc/$pid/mountinfo
and /proc/mounts you can figure out anything you need.

	Cyrill