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rbd: a little more cleanup of rbd_rq_fn()

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Now that a big hunk in the middle of rbd_rq_fn() has been moved
into its own routine we can simplify it a little more.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2012-11-08 08:01:39 -06:00 committed by Alex Elder
parent cd323ac0eb
commit b395e8b5b8
1 changed files with 27 additions and 29 deletions
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56
drivers/block/rbd.c
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@ -1644,53 +1644,51 @@ static int rbd_dev_do_request(struct request *rq,
static void rbd_rq_fn(struct request_queue *q)
{
struct rbd_device *rbd_dev = q->queuedata;
bool read_only = rbd_dev->mapping.read_only;
struct request *rq;
while ((rq = blk_fetch_request(q))) {
struct bio *bio;
bool do_write;
unsigned int size;
u64 ofs;
struct ceph_snap_context *snapc;
struct ceph_snap_context *snapc = NULL;
unsigned int size = 0;
int result;
dout("fetched request\n");
/* filter out block requests we don't understand */
/* Filter out block requests we don't understand */
if ((rq->cmd_type != REQ_TYPE_FS)) {
__blk_end_request_all(rq, 0);
continue;
}
/* deduce our operation (read, write) */
do_write = (rq_data_dir(rq) == WRITE);
if (do_write && rbd_dev->mapping.read_only) {
__blk_end_request_all(rq, -EROFS);
continue;
}
spin_unlock_irq(q->queue_lock);
/* Stop writes to a read-only device */
result = -EROFS;
if (read_only && rq_data_dir(rq) == WRITE)
goto out_end_request;
/* Grab a reference to the snapshot context */
down_read(&rbd_dev->header_rwsem);
if (!rbd_dev->exists) {
rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP);
up_read(&rbd_dev->header_rwsem);
dout("request for non-existent snapshot");
spin_lock_irq(q->queue_lock);
__blk_end_request_all(rq, -ENXIO);
continue;
if (rbd_dev->exists) {
snapc = ceph_get_snap_context(rbd_dev->header.snapc);
rbd_assert(snapc != NULL);
}
snapc = ceph_get_snap_context(rbd_dev->header.snapc);
up_read(&rbd_dev->header_rwsem);
size = blk_rq_bytes(rq);
ofs = blk_rq_pos(rq) * SECTOR_SIZE;
bio = rq->bio;
if (!snapc) {
rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP);
dout("request for non-existent snapshot");
result = -ENXIO;
goto out_end_request;
}
result = rbd_dev_do_request(rq, rbd_dev, snapc, ofs, size, bio);
size = blk_rq_bytes(rq);
result = rbd_dev_do_request(rq, rbd_dev, snapc,
blk_rq_pos(rq) * SECTOR_SIZE,
size, rq->bio);
out_end_request:
ceph_put_snap_context(snapc);
spin_lock_irq(q->queue_lock);
if (!size || result < 0)