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[PATCH] block: support larger block pc requests

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This patch modifies blk_rq_map/unmap_user() and the cdrom and scsi_ioctl.c
users so that it supports requests larger than bio by chaining them together.

Signed-off-by: Mike Christie <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Mike Christie 2006-12-01 10:40:55 +01:00 • committed by Jens Axboe
commit 0e75f9063f
5 changed files with 160 additions and 90 deletions
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6
drivers/cdrom/cdrom.c
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@ -2133,16 +2133,14 @@ static int cdrom_read_cdda_bpc(struct cdrom_device_info *cdi, __u8 __user *ubuf,
rq->timeout = 60 * HZ;
bio = rq->bio;
if (rq->bio)
blk_queue_bounce(q, &rq->bio);
if (blk_execute_rq(q, cdi->disk, rq, 0)) {
struct request_sense *s = rq->sense;
ret = -EIO;
cdi->last_sense = s->sense_key;
}
if (blk_rq_unmap_user(bio, len))
rq->bio = bio;
if (blk_rq_unmap_user(rq))
ret = -EFAULT;
if (ret)