Re: Some way of telling which block devices are in use (and how)

[Ted Ts'o <tytso@mit.edu>]

I've been looking more closely at this, and I think we can make things
better by having the file system create a symlink from partition's
holders directory to the file system's kobject (assuming the file
system has a kobject, which most do not have).  i.e., I'd add to
ext4_fill_super() something like this:

	ret = add_symlink(bdev->bd_part->holder_dir, &ext4_kset->kobj);

Currently, the holders directory will show links for md and
devicemapper users of the block device.  This would add a link if ext4
has the block device mounted.

It's not a complete solution, but I think it would help, and as far as
I can tell, it's in the spirit of how the holders directory was
(partially) implemented.

					- Ted