From: Tejun Heo <tj@kernel.org>
To: Kent Overstreet <koverstreet@google.com>
Cc: linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org,
dm-devel@redhat.com, axboe@kernel.dk, neilb@suse.de
Subject: Re: [PATCH v2 15/26] block: Add bio_copy_data()
Date: Thu, 20 Sep 2012 17:09:47 -0700 [thread overview]
Message-ID: <20120921000947.GT7264@google.com> (raw)
In-Reply-To: <20120921000632.GS7264@google.com>
On Thu, Sep 20, 2012 at 05:06:32PM -0700, Tejun Heo wrote:
> Hello,
>
> On Mon, Sep 10, 2012 at 05:22:26PM -0700, Kent Overstreet wrote:
> > +void bio_copy_data(struct bio *dst, struct bio *src)
> > +{
> ...
> > + src_p = kmap_atomic(src_bv->bv_page);
> > + dst_p = kmap_atomic(dst_bv->bv_page);
> > +
> > + memcpy(dst_p + dst_bv->bv_offset,
> > + src_p + src_bv->bv_offset,
> > + bytes);
> > +
> > + kunmap_atomic(dst_p);
> > + kunmap_atomic(src_p);
>
> Wrap these in preempt_disable/enable() to allow the function to be
> called from any context?
Ooh, and maybe return the amount of copied data?
--
tejun
next prev parent reply other threads:[~2012-09-21 0:09 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-11 0:22 [PATCH v2 00/26] Prep work for immutable bio vecs Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 01/26] block: Convert integrity to bvec_alloc_bs(), and a bugfix Kent Overstreet
[not found] ` <1347322957-25260-2-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-11 20:36 ` [dm-devel] " Vivek Goyal
2012-09-11 20:48 ` Kent Overstreet
2012-09-11 22:07 ` Kent Overstreet
[not found] ` <20120911220750.GM19739-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-12 19:39 ` Martin K. Petersen
[not found] ` <yq1wqzzrpy1.fsf-+q57XtR/GgMb6DWv4sQWN6xOck334EZe@public.gmane.org>
2012-09-17 21:08 ` Kent Overstreet
2012-09-20 21:53 ` Tejun Heo
2012-09-11 0:22 ` [PATCH v2 02/26] block: Add bio_advance() Kent Overstreet
[not found] ` <1347322957-25260-3-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 21:58 ` Tejun Heo
2012-09-20 23:13 ` Kent Overstreet
[not found] ` <20120920231308.GB5519-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:25 ` Tejun Heo
[not found] ` <20120920232506.GI7264-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:38 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 03/26] block: Refactor blk_update_request() Kent Overstreet
[not found] ` <1347322957-25260-4-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:20 ` Tejun Heo
2012-09-20 23:36 ` Kent Overstreet
[not found] ` <20120920233632.GC5519-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:41 ` Tejun Heo
[not found] ` <20120920234133.GM7264-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:50 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 04/26] md: Convert md_trim_bio() to use bio_advance() Kent Overstreet
[not found] ` <1347322957-25260-5-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:27 ` Tejun Heo
2012-09-11 0:22 ` [PATCH v2 05/26] block: Add bio_end() Kent Overstreet
[not found] ` <1347322957-25260-6-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-17 9:17 ` Steven Whitehouse
2012-09-20 23:32 ` Tejun Heo
[not found] ` <20120920233225.GK7264-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:44 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 06/26] block: Use bio_sectors() more consistently Kent Overstreet
[not found] ` <1347322957-25260-7-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:36 ` Tejun Heo
[not found] ` <20120920233618.GL7264-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:47 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 07/26] block: Don't use bi_idx in bio_split() or require it to be 0 Kent Overstreet
[not found] ` <1347322957-25260-8-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:45 ` Tejun Heo
[not found] ` <20120920234544.GN7264-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 0:00 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 09/26] block: Remove some unnecessary bi_vcnt usage Kent Overstreet
[not found] ` <1347322957-25260-10-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:51 ` Tejun Heo
2012-09-11 0:22 ` [PATCH v2 10/26] block: Add submit_bio_wait(), remove from md Kent Overstreet
[not found] ` <1347322957-25260-11-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:56 ` Tejun Heo
[not found] ` <20120920235643.GQ7264-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 0:06 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 11/26] raid10: Use bio_reset() Kent Overstreet
2012-09-20 23:59 ` Tejun Heo
2012-09-11 0:22 ` [PATCH v2 13/26] raid5: use bio_reset() Kent Overstreet
[not found] ` <1347322957-25260-14-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-11 5:03 ` NeilBrown
[not found] ` <20120911150326.79f066c0-wvvUuzkyo1EYVZTmpyfIwg@public.gmane.org>
2012-09-11 19:26 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 14/26] raid1: Refactor narrow_write_error() to not use bi_idx Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 15/26] block: Add bio_copy_data() Kent Overstreet
[not found] ` <1347322957-25260-16-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 0:06 ` Tejun Heo
2012-09-21 0:09 ` Kent Overstreet
[not found] ` <20120921000945.GK5519-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 0:15 ` Tejun Heo
2012-09-21 0:09 ` Tejun Heo [this message]
[not found] ` <20120921000947.GT7264-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 0:13 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 16/26] pktcdvd: use bio_copy_data() Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 17/26] pktcdvd: Use bio_reset() in disabled code to kill bi_idx usage Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 18/26] raid1: use bio_copy_data() Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 20/26] block: Add bio_for_each_segment_all() Kent Overstreet
[not found] ` <1347322957-25260-21-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 0:35 ` Tejun Heo
2012-09-11 0:22 ` [PATCH v2 22/26] block: Add bio_alloc_pages() Kent Overstreet
[not found] ` <1347322957-25260-23-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 0:47 ` Tejun Heo
[not found] ` <20120921004711.GZ7264-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 4:50 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 24/26] block: Add an explicit bio flag for bios that own their bvec Kent Overstreet
[not found] ` <1347322957-25260-1-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-11 0:22 ` [PATCH v2 08/26] block: Remove bi_idx references Kent Overstreet
[not found] ` <1347322957-25260-9-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-20 23:49 ` Tejun Heo
2012-09-21 0:04 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 12/26] raid1: use bio_reset() Kent Overstreet
[not found] ` <1347322957-25260-13-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-11 4:59 ` NeilBrown
2012-09-11 18:28 ` Kent Overstreet
[not found] ` <20120911182825.GG19739-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-11 21:17 ` NeilBrown
2012-09-11 0:22 ` [PATCH v2 19/26] bounce: Refactor __blk_queue_bounce to not use bi_io_vec Kent Overstreet
[not found] ` <1347322957-25260-20-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 0:25 ` Tejun Heo
2012-09-21 0:29 ` Kent Overstreet
2012-09-21 0:27 ` Tejun Heo
2012-09-21 0:34 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 21/26] block: Convert some code to bio_for_each_segment_all() Kent Overstreet
[not found] ` <1347322957-25260-22-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 0:38 ` Tejun Heo
[not found] ` <20120921003832.GY7264-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 0:50 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 23/26] raid1: use bio_alloc_pages() Kent Overstreet
[not found] ` <1347322957-25260-24-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 0:48 ` Tejun Heo
[not found] ` <20120921004827.GA7264-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-21 4:51 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 25/26] bio-integrity: Add explicit field for owner of bip_buf Kent Overstreet
[not found] ` <1347322957-25260-26-git-send-email-koverstreet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-09-12 19:41 ` Martin K. Petersen
[not found] ` <yq1sjanrpu7.fsf-+q57XtR/GgMb6DWv4sQWN6xOck334EZe@public.gmane.org>
2012-09-17 21:09 ` Kent Overstreet
2012-09-11 0:22 ` [PATCH v2 26/26] block: Add BIO_SUBMITTED flag, kill BIO_CLONED Kent Overstreet
2012-09-11 5:22 ` [PATCH v2 00/26] Prep work for immutable bio vecs NeilBrown
2012-09-20 23:22 ` Tejun Heo
2012-10-15 20:08 [PATCH v4 00/24] " Kent Overstreet
2012-10-15 20:09 ` [PATCH v2 15/26] block: Add bio_copy_data() Kent Overstreet
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