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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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