/*
* Common read path running under the zvol taskq context. This function
* is responsible for copying the requested data out of the DMU and in to
* a linux request structure. It then must signal the request queue with
* an error code describing the result of the copy.
*/
static void
zvol_read(void *arg)
{
struct request *req = (struct request *)arg;
struct request_queue *q = req->q;
zvol_state_t *zv = q->queuedata;
uint64_t offset = blk_rq_pos(req) << 9;
uint64_t size = blk_rq_bytes(req);
int error;
rl_t *rl;
if (size == 0) {
blk_end_request(req, 0, size);
return;
}
rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER);
error = dmu_read_req(zv->zv_objset, ZVOL_OBJ, req);
zfs_range_unlock(rl);
/* convert checksum errors into IO errors */
if (error == ECKSUM)
error = EIO;
blk_end_request(req, -error, size);
}
/*
* Common read path running under the zvol taskq context. This function
* is responsible for copying the requested data out of the DMU and in to
* a linux request structure. It then must signal the request queue with
* an error code describing the result of the copy.
*/
static void
zvol_read(void *arg)
{
struct request *req = (struct request *)arg;
struct request_queue *q = req->q;
zvol_state_t *zv = q->queuedata;
fstrans_cookie_t cookie = spl_fstrans_mark();
uint64_t offset = blk_rq_pos(req) << 9;
uint64_t size = blk_rq_bytes(req);
int error;
rl_t *rl;
if (size == 0) {
error = 0;
goto out;
}
rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER);
error = dmu_read_req(zv->zv_objset, ZVOL_OBJ, req);
zfs_range_unlock(rl);
/* convert checksum errors into IO errors */
if (error == ECKSUM)
error = SET_ERROR(EIO);
out:
blk_end_request(req, -error, size);
spl_fstrans_unmark(cookie);
}
