linux-kernel - [RFC][PATCH 10/10] I/O context inheritance

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Date:	Tue, 22 Apr 2008 23:00:17 +0900 (JST)
From:	Hirokazu Takahashi <taka@...inux.co.jp>
To:	jens.axboe@...cle.com, agk@...rceware.org
Cc:	dm-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: [RFC][PATCH 10/10] I/O context inheritance


The floppy driver will allocate a bio on its stack, so its iocontext
should be set here.

This code hasn't been tested yet.

Signed-off-by: Hirokazu Takahashi <taka@...inux.co.jp>


--- linux-2.6.25.bio0/drivers/block/floppy.c	2008-04-22 15:48:36.000000000 +0900
+++ linux-2.6.25/drivers/block/floppy.c	2008-04-22 21:33:40.000000000 +0900
@@ -3845,12 +3845,14 @@ static int __floppy_read_block_0(struct 
 	init_completion(&complete);
 	bio.bi_private = &complete;
 	bio.bi_end_io = floppy_rb0_complete;
+	bio.bi_io_context = get_io_context(GFP_NOIO, -1);
 
 	submit_bio(READ, &bio);
 	generic_unplug_device(bdev_get_queue(bdev));
 	process_fd_request();
 	wait_for_completion(&complete);
 
+	put_io_context(bio.bi_io_context);
 	__free_page(page);
 
 	return 0;
--
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