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

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Message-ID: <87sjq7bmm4.fsf@tucsk.pomaz.szeredi.hu>
Date:	Fri, 15 Jul 2011 17:16:19 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	"J. R. Okajima" <hooanon05@...oo.co.jp>
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

"J. R. Okajima" <hooanon05@...oo.co.jp> writes:

> 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.

Yeah, good observation.  Copy-up shouldn't fail on RLIMIT_FSIZE and it
doesn't because splice ignores RLIMIT_FSIZE.

So overlayfs works correctly because of a bug in splice.  Not very
satisfactory situation.

Thanks,
Miklos
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