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Date: Sun, 2 Feb 2014 19:23:06 +0000
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [RFC] unifying write variants for filesystems
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To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jens Axboe <axboe@kernel.dk>, Steve French <sfrench@samba.org>, Sage Weil <sage@inktank.com>, Dave Kleikamp <shaggy@kernel.org>, Mark Fasheh <mfasheh@suse.com>, Miklos Szeredi <miklos@szeredi.hu>, xfs@oss.sgi.com, Christoph Hellwig <hch@infradead.org>, Joel Becker <jlbec@evilplan.org>, linux-fsdevel <linux-fsdevel@vger.kernel.org>, Anton Altaparmakov <anton@tuxera.com>

On Sun, Feb 02, 2014 at 07:21:04PM +0000, Al Viro wrote:
> BTW, is there any reason why fuse/dev.c doesn't use atomic kmaps for
> everything?  After all, as soon as we'd done kmap() in there, we
> grab a spinlock and don't drop it until just before kunmap().  With
> nothing by memcpy() done in between...  Miklos?  AFAICS, we only win

s/by/but/ - sorry...

> from switching to kmap_atomic there - we can't block anyway, we don't
> need it to be visible on other CPUs and nesting isn't a problem.
> Looks like it'll be cheaper in highmem cases and do exactly the same
> thing as now for non-highmem...  Comments?
> --
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