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block: implement and use [__]blk_end_request_all()

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There are many [__]blk_end_request() call sites which call it with
full request length and expect full completion.  Many of them ensure
that the request actually completes by doing BUG_ON() the return
value, which is awkward and error-prone.

This patch adds [__]blk_end_request_all() which takes @rq and @error
and fully completes the request.  BUG_ON() is added to to ensure that
this actually happens.

Most conversions are simple but there are a few noteworthy ones.

* cdrom/viocd: viocd_end_request() replaced with direct calls to
  __blk_end_request_all().

* s390/block/dasd: dasd_end_request() replaced with direct calls to
  __blk_end_request_all().

* s390/char/tape_block: tapeblock_end_request() replaced with direct
  calls to blk_end_request_all().

[ Impact: cleanup ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Mike Miller <mike.miller@hp.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Jeff Garzik <jgarzik@pobox.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Tejun Heo
2009-04-23 11:05:19 +09:00
committed by Jens Axboe
parent b243ddcbe9
commit 40cbbb781d
15 changed files with 58 additions and 73 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/cdrom/viocd.c
View File

@@ -291,23 +291,6 @@ static int send_request(struct request *req)
return 0;
}
static void viocd_end_request(struct request *req, int error)
{
int nsectors = req->hard_nr_sectors;
/*
* Make sure it's fully ended, and ensure that we process
* at least one sector.
*/
if (blk_pc_request(req))
nsectors = (req->data_len + 511) >> 9;
if (!nsectors)
nsectors = 1;
if (__blk_end_request(req, error, nsectors << 9))
BUG();
}
static int rwreq;
static void do_viocd_request(struct request_queue *q)
@@ -316,11 +299,11 @@ static void do_viocd_request(struct request_queue *q)
while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
if (!blk_fs_request(req))
viocd_end_request(req, -EIO);
__blk_end_request_all(req, -EIO);
else if (send_request(req) < 0) {
printk(VIOCD_KERN_WARNING
"unable to send message to OS/400!");
viocd_end_request(req, -EIO);
__blk_end_request_all(req, -EIO);
} else
rwreq++;
}
@@ -531,9 +514,9 @@ return_complete:
"with rc %d:0x%04X: %s\n",
req, event->xRc,
bevent->sub_result, err->msg);
viocd_end_request(req, -EIO);
__blk_end_request_all(req, -EIO);
} else
viocd_end_request(req, 0);
__blk_end_request_all(req, 0);
/* restart handling of incoming requests */
spin_unlock_irqrestore(&viocd_reqlock, flags);