linux-kernel - Re: [patch 01/10] vfs: add path_create() and path

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Message-ID: <20080402234758.GS9785@ZenIV.linux.org.uk>
Date:	Thu, 3 Apr 2008 00:47:58 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	Miklos Szeredi <miklos@...redi.hu>, akpm@...ux-foundation.org,
	dave@...ux.vnet.ibm.com, ezk@...sunysb.edu,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 01/10] vfs: add path_create() and path_mknod()

On Thu, Apr 03, 2008 at 12:40:43AM +0100, Al Viro wrote:
> Anyway, what the hell for?  It's more complex and buys you nothing
> useful.

BTW, what it gives you is an extra headache for scenarios like

task A:
	write(fd, ...)
task B:	/* shares descriptor table with A */
	close(fd)
task C: umount(<mountpoint of tree where fd is>)
...
task A: still writing

At the very least, you want "that thing is still busy" on normal umount -
we are still in the middle of write(2) and hell knows how long it's going
to last.  So you need to play with refcount of vfsmount in a very nasty
way, for all your pains.  Again, what for?
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