Messages in this thread Patch in this message | | | Date | Tue, 22 Apr 2008 22:53:55 +0900 (JST) | Subject | [RFC][PATCH 3/10] I/O context inheritance | From | Hirokazu Takahashi <> |
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Make every bio points the iocontext of the process which originally generated an I/O request. (part 2)
- Assign the iocontext which the source bio has to a bio when it is allocated as a bounce buffer. - Assign the iocontext which the source bio has to bios when the source bio is split into several ones, which some device mapper modules require.
Signed-off-by: Hirokazu Takahashi <taka@valinux.co.jp>
--- linux-2.6.25.bio0/mm/bounce.c 2008-04-22 15:48:32.000000000 +0900 +++ linux-2.6.25/mm/bounce.c 2008-04-22 15:51:33.000000000 +0900 @@ -195,8 +195,11 @@ static void __blk_queue_bounce(struct re /* * irk, bounce it */ - if (!bio) + if (!bio) { bio = bio_alloc(GFP_NOIO, (*bio_orig)->bi_vcnt); + put_io_context(bio->bi_io_context); + bio->bi_io_context = ioc_object_link((*bio_orig)->bi_io_context); + } to = bio->bi_io_vec + i; --- linux-2.6.25.bio0/drivers/md/dm.c 2008-04-22 15:48:33.000000000 +0900 +++ linux-2.6.25/drivers/md/dm.c 2008-04-22 17:16:49.000000000 +0900 @@ -665,6 +665,7 @@ static struct bio *split_bvec(struct bio clone->bi_size = to_bytes(len); clone->bi_io_vec->bv_offset = offset; clone->bi_io_vec->bv_len = clone->bi_size; + clone->bi_io_context = ioc_object_link(bio->bi_io_context); return clone; }
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