Il 23/08/2012 10:06, Cyrill Gorcunov ha scritto:

On Wed, Aug 22, 2012 at 11:19:07AM +0530, Aneesh Kumar K.V wrote:

quoted

Pavel Emelyanov [off-list ref] writes:

quoted

Why? For e.g. ext4 you can construct a handle in userspace and open by
it.

open_by_handle use exportfs_decode_fh which use file system specific
fh_to_dentry

foe ext4 we require a generation number

		inode = get_inode(sb, fid->i32.ino, fid->i32.gen);

Hi Aneesh, yes we need i_generation but for ext3/4 it could be
fetched with ioctl as far as i see.

quoted

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.

	Cyrill
--

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.

Marco