From: Steve French <smfrench@gmail.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Milosz Tanski <milosz@adfin.com>
Subject: Re: pread2/ pwrite2
Date: Fri, 9 Jan 2015 13:30:31 -0600 [thread overview]
Message-ID: <CAH2r5mtwQEJ1q=a_4TSQyY=Qt7TZ7Dtj9oVGfCHJ+Enrj8v5qQ@mail.gmail.com> (raw)
In-Reply-To: <20150108114950.GB3351@infradead.org>
On Thu, Jan 8, 2015 at 5:49 AM, Christoph Hellwig <hch@infradead.org> wrote:
> On Tue, Jan 06, 2015 at 12:47:14AM -0800, Andrew Morton wrote:
>> > progress, which is a bit frustrating.
>>
>> I took a look at pread2() as well and I have two main issues:
>>
>> - The patchset includes a pwrite2() syscall which has nothing to do
>> with nonblocking reads and which was poorly described and had little
>> justification for inclusion.
>
> It allows to do O_SYNC writes on a per-I/O basis. This is very useful
> for file servers (smb, cifs) as well as storage target devices.
This would be particularly useful for SMB3 as the protocol now allows
write-through vs. no-write-through flag on every write request (not just
on an open, it can be changed on a particular i/o to write-through).
There is also a cache/no-cache hint that can be sent on reads/writes in
the newest SMB3 dialect well (but it is less clear to me how we would
ever decide to set that on the Linux client).
--
Thanks,
Steve
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next prev parent reply other threads:[~2015-01-09 19:30 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-24 21:20 [PATCH v12 00/20] DAX: Page cache bypass for filesystems on memory storage Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 01/20] axonram: Fix bug in direct_access Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 02/20] block: Change direct_access calling convention Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 03/20] mm: Fix XIP fault vs truncate race Matthew Wilcox
2015-01-12 23:09 ` Andrew Morton
2015-01-13 18:50 ` Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 04/20] mm: Allow page fault handlers to perform the COW Matthew Wilcox
2015-01-12 23:09 ` Andrew Morton
2015-01-13 18:58 ` Matthew Wilcox
2015-02-05 9:16 ` Yigal Korman
2015-02-05 21:39 ` Matthew Wilcox
2015-02-08 11:48 ` Yigal Korman
2014-10-24 21:20 ` [PATCH v12 05/20] vfs,ext2: Introduce IS_DAX(inode) Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 06/20] dax,ext2: Replace XIP read and write with DAX I/O Matthew Wilcox
2015-01-12 23:09 ` Andrew Morton
2015-01-13 20:59 ` Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 07/20] dax,ext2: Replace ext2_clear_xip_target with dax_clear_blocks Matthew Wilcox
2015-01-12 23:09 ` Andrew Morton
2015-01-13 21:39 ` Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 08/20] dax,ext2: Replace the XIP page fault handler with the DAX page fault handler Matthew Wilcox
2015-01-12 23:09 ` Andrew Morton
2015-01-13 21:53 ` Matthew Wilcox
2015-01-13 22:47 ` Andrew Morton
2014-10-24 21:20 ` [PATCH v12 09/20] dax,ext2: Replace xip_truncate_page with dax_truncate_page Matthew Wilcox
2015-01-12 23:09 ` Andrew Morton
2015-01-13 21:55 ` Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 10/20] dax: Replace XIP documentation with DAX documentation Matthew Wilcox
2015-01-12 23:10 ` Andrew Morton
2016-01-21 18:38 ` Jared Hulbert
2016-01-22 13:07 ` Wilcox, Matthew R
2016-01-22 13:48 ` Chris Brandt
2016-01-22 14:39 ` Matthew Wilcox
2016-01-24 9:03 ` Jared Hulbert
2016-01-25 16:52 ` Matthew Wilcox
2016-01-25 21:18 ` Jared Hulbert
2016-01-27 19:51 ` Jared Hulbert
2014-10-24 21:20 ` [PATCH v12 11/20] vfs: Remove get_xip_mem Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 12/20] ext2: Remove ext2_xip_verify_sb() Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 13/20] ext2: Remove ext2_use_xip Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 14/20] ext2: Remove xip.c and xip.h Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 15/20] vfs,ext2: Remove CONFIG_EXT2_FS_XIP and rename CONFIG_FS_XIP to CONFIG_FS_DAX Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 16/20] ext2: Remove ext2_aops_xip Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 17/20] ext2: Get rid of most mentions of XIP in ext2 Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 18/20] dax: Add dax_zero_page_range Matthew Wilcox
2015-01-12 23:10 ` Andrew Morton
2015-01-12 23:20 ` Ross Zwisler
2014-10-24 21:20 ` [PATCH v12 19/20] ext4: Add DAX functionality Matthew Wilcox
2014-10-24 21:20 ` [PATCH v12 20/20] brd: Rename XIP to DAX Matthew Wilcox
2014-12-10 14:03 ` [PATCH v12 00/20] DAX: Page cache bypass for filesystems on memory storage Christoph Hellwig
2014-12-10 14:12 ` Matthew Wilcox
2014-12-10 14:28 ` Jeff Moyer
2014-12-10 20:53 ` Dave Chinner
2015-01-05 18:41 ` Christoph Hellwig
2015-01-06 8:47 ` Andrew Morton
2015-01-08 11:49 ` pread2/ pwrite2 Christoph Hellwig
2015-01-09 19:30 ` Steve French [this message]
2015-01-08 16:27 ` [PATCH v12 00/20] DAX: Page cache bypass for filesystems on memory storage Milosz Tanski
2015-01-08 16:28 ` Milosz Tanski
2015-01-08 17:36 ` Jeremy Allison
2015-01-12 14:47 ` Matthew Wilcox
2015-01-12 23:09 ` Andrew Morton
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