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Open Source and information security mailing list archives
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Date: Sat, 16 May 2015 02:55:40 +0100 From: Al Viro <viro@...IV.linux.org.uk> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: NeilBrown <neilb@...e.de>, Andreas Dilger <adilger@...ger.ca>, Dave Chinner <david@...morbit.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Christoph Hellwig <hch@...radead.org> Subject: Re: [RFC][PATCHSET v3] non-recursive pathname resolution & RCU symlinks On Fri, May 15, 2015 at 06:47:04PM -0700, Linus Torvalds wrote: > Now, maybe we could solve it with a new sleeping lock in the dentry > itself. Maybe we could allocate the new dentry early, add it to the > directory the usual way, but mark it as being "not ready" (so that > d_lookup() wouldn't use it). And have the sleeping lock be a new > sleeping lock in the dentry. See upthread. It might be doable (provided that we turn ->i_mutex into rwsem, to keep the exclusion with directory _modifiers_), but it'll need a really non-trivial code review of a bunch of filesystems, especially ones that want to play with the list of children like ceph does. And things like sillyrename and dcache-populating readdir instances, albeit not as scary as ceph. And then there's lustre... -- 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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