linux-kernel - Re: [PATCH 0/9] overlay filesystem: request for inclusion (v17)

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Message-ID: <29608.1363373838@jrobl>
Date:	Sat, 16 Mar 2013 03:57:18 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, hch@...radead.org, apw@...onical.com,
	nbd@...nwrt.org, neilb@...e.de, jordipujolp@...il.com,
	ezk@....cs.sunysb.edu, dhowells@...hat.com,
	sedat.dilek@...glemail.com, mszeredi@...e.cz
Subject: Re: [PATCH 0/9] overlay filesystem: request for inclusion (v17)


Al Viro:
> The trouble with such mechanisms is that they tend to end up depending on
> fairly non-trivial properties of underlying fs.  Try aufs one on btrfs,
> see how soon you spot the problem.  It's nice when a method turns out
> to be really redundant and implementable in uniform way via other methods
> present; see fh_to_dentry history for example of situation where it hadn't...

Hmm, I could not see problem around aufs using btrfs as the upper RW
branch, tested on linux-3.9-rc2.
Would you describe more specifically?
Some of my local tests didn't pass due to an error return from
btrfs. For example, repeat "ln fileA $very_loooong_filename", then btrfs
returns EMLINK so soon.

And aufs refers the common set of inode attribute. I mean attrs declared
in VFS. Also I know some filesystems don't maintain attrs on each
operation. For such fs, aufs calls vfs_getattr() internally.


J. R. Okajima
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