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From: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>
To: Al Viro <viro-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
Cc: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
	Miklos Szeredi <mszeredi-AlSwsSmVLrQ@public.gmane.org>,
	<linux-aio-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>,
	<linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Felipe Balbi <balbi-l0cyMroinI0@public.gmane.org>,
	<linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH 3/5] fs: remove ki_nbytes
Date: Thu, 5 Feb 2015 10:29:42 -0500 (EST)	[thread overview]
Message-ID: <Pine.LNX.4.44L0.1502051024240.1542-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <20150204230733.GK29656-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>

On Wed, 4 Feb 2015, Al Viro wrote:

> > > Um...  readv() is also going through ->aio_read().
> > 
> > Why does readv() do this but not read()?  Wouldn't it make more sense 
> > to have all the read* calls use the same internal interface?
> 
> Because there are two partially overlapping classes wrt vector IO semantics:
...

Thanks for the detailed explanation.  It appears to boil down to a 
series of historical accidents.

In any case, feel free to copy the non-isochronous behavior of the
synchronous routines in the async routines.  It certainly won't hurt 
anything.

Alan Stern

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  parent reply	other threads:[~2015-02-05 15:29 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-27 17:55 [RFC] split struct kiocb Christoph Hellwig
2015-01-27 17:55 ` [PATCH 1/5] fs: don't allow to complete sync iocbs through aio_complete Christoph Hellwig
2015-01-28 15:30   ` Miklos Szeredi
2015-01-28 16:57     ` Christoph Hellwig
2015-01-31  3:01       ` Maxim Patlasov
2015-01-27 17:55 ` [PATCH 2/5] fs: saner aio_complete prototype Christoph Hellwig
2015-01-31 10:04   ` Al Viro
2015-01-27 17:55 ` [PATCH 3/5] fs: remove ki_nbytes Christoph Hellwig
2015-01-31  6:08   ` Al Viro
2015-02-02  8:07     ` Christoph Hellwig
2015-02-02  8:11       ` Al Viro
2015-02-02  8:14         ` Al Viro
2015-02-02 14:26           ` Christoph Hellwig
2015-02-04  8:34             ` Al Viro
2015-02-04 18:17               ` Alan Stern
2015-02-04 19:06                 ` Al Viro
2015-02-04 20:30                   ` Alan Stern
2015-02-04 23:07                     ` Al Viro
2015-02-05  8:24                       ` Robert Baldyga
2015-02-05  8:47                         ` Al Viro
2015-02-05  9:03                           ` Al Viro
2015-02-05  9:15                             ` Robert Baldyga
     [not found]                       ` <20150204230733.GK29656-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
2015-02-05 15:29                         ` Alan Stern [this message]
2015-02-06  7:03                           ` Al Viro
     [not found]                             ` <20150206070350.GX29656-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
2015-02-06  8:44                               ` Robert Baldyga
2015-02-07  5:44                           ` Al Viro
2015-02-07  5:48                             ` [PATCH 1/6] new helper: dup_iter() Al Viro
2015-02-07  5:48                             ` [PATCH 2/6] gadget/function/f_fs.c: close leaks Al Viro
2015-02-07  5:48                             ` [PATCH 3/6] gadget/function/f_fs.c: use put iov_iter into io_data Al Viro
2015-02-07  5:48                             ` [PATCH 4/6] gadget/function/f_fs.c: switch to ->{read,write}_iter() Al Viro
2015-02-07  5:48                             ` [PATCH 5/6] gadgetfs: use-after-free in ->aio_read() Al Viro
2015-02-07  5:48                             ` [PATCH 6/6] gadget: switch ep_io_operations to ->read_iter/->write_iter Al Viro
2015-02-02 14:20         ` [PATCH 3/5] fs: remove ki_nbytes Christoph Hellwig
2015-01-27 17:55 ` [PATCH 4/5] fs: split generic and aio kiocb Christoph Hellwig
2015-01-27 17:55 ` [PATCH 5/5] fs: add async read/write interfaces Christoph Hellwig
2015-01-31  6:29   ` Al Viro

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