lkml.org 
[lkml]   [2013]   [Jan]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH V5 00/30] loop: Issue O_DIRECT aio using bio_vec
From
On Wed, Jan 16, 2013 at 5:32 PM, James Bottomley
<jbottomley@parallels.com> wrote:
> On Wed, 2013-01-09 at 13:58 -0600, Dave Kleikamp wrote:
>> This patchset was begun by Zach Brown and was originally submitted for
>> review in October, 2009. Feedback was positive, and I have picked up
>> where he left off, porting his patches to the latest mainline kernel
>> and adding support more file systems.
>>
>> This patch series adds a kernel interface to fs/aio.c so that kernel code can
>> issue concurrent asynchronous IO to file systems. It adds an aio command and
>> file system methods which specify io memory with pages instead of userspace
>> addresses.
>>
>> This series was written to reduce the current overhead loop imposes by
>> performing synchronus buffered file system IO from a kernel thread. These
>> patches turn loop into a light weight layer that translates bios into iocbs.
>>
>> It introduces new file ops, read_iter() and write_iter(), that replace the
>> aio_read() and aio_write() operations. The iov_iter structure can now contain
>> either a user-space iovec or a kernel-space bio_vec. Since it would be
>> overly complicated to replace every instance of aio_read() and aio_write(),
>> the old operations are not removed, but file systems implementing the new
>> ones need not keep the old ones.
>>
>> Changes from V4 include:
>> * moved iov-iter.c from mm/ to fs/
>> * removed dio_aligned helper
>> * insured that FUA write to loop device is committed to media
>> * removed no-longer-used REQ_KERNEL define
>>
>> These patches apply to 3.8-rc2 and are also available at:
>> git://github.com/kleikamp/linux-shaggy.git loop_2013_01_04
>>
>> My hopes are that this patchset is finally ready for linux-next.
>
> Just a note that we at parallels are anxiously awaiting this too. Our
> rewrite of the linux loop device to be more efficient (and not double
> cache) depends on this work. I should also note that we've been testing
> these patches (albeit backported to a RHEL kernel as a current work
> base) with no problems reported so far.
>

Hi James,

do you have a location for me for testing this patchset from parallels?

Regards,
- Sedat -

> James
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html


\
 
 \ /
  Last update: 2013-01-16 20:02    [W:0.530 / U:0.304 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site