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From: Paolo Bonzini <pbonzini@redhat.com>
To: Zach Brown <zab@redhat.com>
Cc: "Myklebust, Trond" <Trond.Myklebust@netapp.com>,
	Ric Wheeler <rwheeler@redhat.com>,
	Linux FS Devel <linux-fsdevel@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Chris L. Mason" <clmason@fusionio.com>,
	Christoph Hellwig <hch@infradead.org>,
	Alexander Viro <aviro@redhat.com>,
	"Martin K. Petersen" <mkp@mkp.net>,
	Hannes Reinecke <hare@suse.de>, Joel Becker <jlbec@evilplan.org>
Subject: Re: New copyfile system call - discuss before LSF?
Date: Fri, 22 Feb 2013 10:47:39 +0100	[thread overview]
Message-ID: <51273EBB.1010305@redhat.com> (raw)
In-Reply-To: <20130221222449.GY22221@lenny.home.zabbo.net>

Il 21/02/2013 23:24, Zach Brown ha scritto:
> You could make it work with some locking and out_fd seeking to set the
> write offset before calling sendfile64()+flags, but ugh.
> 
>  ssize_t sendfile(int out_fd, int in_fd, off_t in_offset, off_t
>                   out_offset, size_t count, int flags);
> 
> That seems closer.
> 
> We might also want to pre-emptively offer iovs instead of offsets,
> because that's the very first thing that's going to be requested after
> people prototype having to iterate calling sendfile() for each
> contiguous copy region. 

Indeed, I was about to propose that exactly.  So that would be
psendfilev.  I don't think psendfile is useful, and can be easily
provided at the libc level.

Paolo

  parent reply	other threads:[~2013-02-22  9:48 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-21 11:37 New copyfile system call - discuss before LSF? Ric Wheeler
2013-02-21 13:37 ` Hannes Reinecke
2013-02-21 13:51 ` Myklebust, Trond
2013-02-21 14:57   ` Ric Wheeler
2013-02-21 16:36     ` Andreas Dilger
2013-02-21 20:00     ` Paolo Bonzini
2013-02-21 20:50       ` Myklebust, Trond
2013-02-21 22:24         ` Zach Brown
2013-02-22  1:29           ` Myklebust, Trond
2013-02-23  0:32             ` Eric Wong
2013-03-30 19:45               ` Pavel Machek
2013-03-31 21:23                 ` Eric Wong
2013-02-22  9:47           ` Paolo Bonzini [this message]
2013-02-22  9:52             ` Ric Wheeler
2013-02-22 18:22               ` Zach Brown
2013-02-22 22:48                 ` Myklebust, Trond
2013-02-25 21:14           ` Andy Lutomirski
2013-02-25 21:49             ` Ric Wheeler
2013-02-25 21:59               ` Myklebust, Trond
2013-02-25 22:16                 ` Andy Lutomirski
2013-02-25 23:28                   ` Myklebust, Trond
2013-02-25 23:35                     ` Andy Lutomirski
2013-02-25 23:45                       ` Myklebust, Trond
2013-02-26  0:03                         ` Zach Brown
2013-03-11  9:31                           ` Joel Becker
2013-02-26 21:02             ` Jörn Engel
2013-02-26 22:35               ` Andy Lutomirski
2013-03-30 19:49               ` Pavel Machek
2013-03-30 20:08                 ` Andreas Dilger
2013-03-30 21:45                   ` Pavel Machek
2013-03-30 21:57                     ` Myklebust, Trond
2013-03-30 23:21                       ` Ric Wheeler
2013-03-31  2:53                         ` Andreas Dilger
2013-03-31  3:52                           ` Myklebust, Trond
2013-03-31  4:18                             ` Andy Lutomirski
2013-03-31  4:36                               ` Myklebust, Trond
2013-03-31  4:45                                 ` Myklebust, Trond
2013-04-01 15:49                                 ` J. Bruce Fields
2013-03-31  7:36                       ` Pavel Machek
2013-03-31 18:27                         ` Myklebust, Trond
2013-03-31 18:32                           ` openat(..., AT_UNLINKED) was " Pavel Machek
2013-03-31 18:44                             ` Myklebust, Trond
2013-03-31 22:50                               ` Pavel Machek
2013-03-31 23:14                                 ` Ric Wheeler
2013-03-31 23:18                                   ` Pavel Machek
2013-03-31 23:28                                     ` Ric Wheeler
2013-03-31 23:41                                       ` Pavel Machek
2013-03-31  5:38                     ` AEDilger Gmail
2013-03-31  8:25                       ` Pavel Machek
2013-03-31 11:48                   ` Pádraig Brady
2013-03-30 22:40                 ` Andy Lutomirski
2013-02-21 22:05       ` Ric Wheeler
2013-02-21 22:13         ` Myklebust, Trond
2013-02-22  8:47           ` Ric Wheeler
2013-02-21 18:29   ` Jeremy Allison
2013-02-22  0:29     ` Eric Wong

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