linux-kernel - Re: [PATCH 0/7] overlay filesystem: request for inclusion

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Message-ID: <13585.1310736814@jrobl>
Date:	Fri, 15 Jul 2011 22:33:34 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	NeilBrown <neilb@...e.de>, viro@...IV.linux.org.uk,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, apw@...onical.com, nbd@...nwrt.org,
	hramrach@...trum.cz, jordipujolp@...il.com, ezk@....cs.sunysb.edu
Subject: Re: [PATCH 0/7] overlay filesystem: request for inclusion

Miklos Szeredi:
> Overlayfs will create a private clone of both the lower and upper
> mounts.  The mnt_flags are only modified on the private clone, whose
> sole user is overlayfs itself.

Yes, I've found overlayfs creates private clone mounts. Sorry noise
again.
By cloning privately, users cannot change mount flags. But it will not
be a big problem.

By the way, you might remember that I have asked about overriding
creditials and signals.
When a process issues chmod, rename or something, then the internal
copyup happens. If RLIMIT_FSIZE is set to the process, then it may
fire SIGXFSZ and return EFBIG. It looks strange. But I don't know how
important is it since setting RLIMIT_FSIZE is less popular I am afraid.

J. R. Okajima
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