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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 12-11-2007, 09:50 PM
Kiyoshi Ueda
 
Default blk_end_request: changing ide normal caller (take 4)

This patch converts "normal" parts of ide to use blk_end_request
interfaces. Related 'uptodate' arguments are converted to 'error'.

The conversion of 'uptodate' to 'error' is done only for the internal
function, __ide_end_request().
ide_end_request() was not changed since it's exported and used
by many ide drivers.


With this patch, blkdev_dequeue_request() in __ide_end_request() is
moved to blk_end_request, since blk_end_request takes care of
dequeueing request like below:

if (!list_empty(&rq->queuelist))
blkdev_dequeue_request(rq);

In the case of ide,
o 'dequeue' variable of __ide_end_request() is 1 only when the request
is still linked to the queue (i.e. rq->queuelist is not empty)
o 'dequeue' variable of __ide_end_request() is 0 only when the request
has already been removed from the queue (i.e. rq->queuelist is empty)
So blk_end_request can handle it correctly although ide always run
thought the code above.

Cc: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
---
drivers/ide/ide-cd.c | 6 +++---
drivers/ide/ide-io.c | 25 ++++++++++++-------------
2 files changed, 15 insertions(+), 16 deletions(-)

Index: 2.6.24-rc4/drivers/ide/ide-cd.c
================================================== =================
--- 2.6.24-rc4.orig/drivers/ide/ide-cd.c
+++ 2.6.24-rc4/drivers/ide/ide-cd.c
@@ -655,9 +655,9 @@ static void cdrom_end_request (ide_drive
BUG();
} else {
spin_lock_irqsave(&ide_lock, flags);
- end_that_request_chunk(failed, 0,
- failed->data_len);
- end_that_request_last(failed, 0);
+ if (__blk_end_request(failed, -EIO,
+ failed->data_len))
+ BUG();
spin_unlock_irqrestore(&ide_lock, flags);
}
} else
Index: 2.6.24-rc4/drivers/ide/ide-io.c
================================================== =================
--- 2.6.24-rc4.orig/drivers/ide/ide-io.c
+++ 2.6.24-rc4/drivers/ide/ide-io.c
@@ -58,15 +58,19 @@ static int __ide_end_request(ide_drive_t
int uptodate, unsigned int nr_bytes, int dequeue)
{
int ret = 1;
+ int error = 0;
+
+ if (uptodate <= 0)
+ error = uptodate ? uptodate : -EIO;

/*
* if failfast is set on a request, override number of sectors and
* complete the whole request right now
*/
- if (blk_noretry_request(rq) && end_io_error(uptodate))
+ if (blk_noretry_request(rq) && error)
nr_bytes = rq->hard_nr_sectors << 9;

- if (!blk_fs_request(rq) && end_io_error(uptodate) && !rq->errors)
+ if (!blk_fs_request(rq) && error && !rq->errors)
rq->errors = -EIO;

/*
@@ -78,14 +82,9 @@ static int __ide_end_request(ide_drive_t
HWGROUP(drive)->hwif->ide_dma_on(drive);
}

- if (!end_that_request_chunk(rq, uptodate, nr_bytes)) {
- add_disk_randomness(rq->rq_disk);
- if (dequeue) {
- if (!list_empty(&rq->queuelist))
- blkdev_dequeue_request(rq);
+ if (!__blk_end_request(rq, error, nr_bytes)) {
+ if (dequeue)
HWGROUP(drive)->rq = NULL;
- }
- end_that_request_last(rq, uptodate);
ret = 0;
}

@@ -292,9 +291,9 @@ static void ide_complete_pm_request (ide
drive->blocked = 0;
blk_start_queue(drive->queue);
}
- blkdev_dequeue_request(rq);
HWGROUP(drive)->rq = NULL;
- end_that_request_last(rq, 1);
+ if (__blk_end_request(rq, 0, 0))
+ BUG();
spin_unlock_irqrestore(&ide_lock, flags);
}

@@ -391,10 +390,10 @@ void ide_end_drive_cmd (ide_drive_t *dri
}

spin_lock_irqsave(&ide_lock, flags);
- blkdev_dequeue_request(rq);
HWGROUP(drive)->rq = NULL;
rq->errors = err;
- end_that_request_last(rq, !rq->errors);
+ if (__blk_end_request(rq, (rq->errors ? -EIO : 0), 0))
+ BUG();
spin_unlock_irqrestore(&ide_lock, flags);
}


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