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authorChristoph Hellwig <hch@lst.de>2014-05-01 18:51:04 +0400
committerChristoph Hellwig <hch@lst.de>2014-05-19 14:35:09 +0400
commita1b73fc194e73ed33c8b77bf09374cb05b58151b (patch)
tree6487feb93c538ca97313408dabdb1f957d6246fe /drivers/scsi/sd.c
parentbc85dc500f9df9b2eec15077e5046672c46adeaa (diff)
downloadlinux-a1b73fc194e73ed33c8b77bf09374cb05b58151b.tar.xz
scsi: reintroduce scsi_driver.init_command
Instead of letting the ULD play games with the prep_fn move back to the model of a central prep_fn with a callback to the ULD. This already cleans up and shortens the code by itself, and will be required to properly support blk-mq in the SCSI midlayer. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Reviewed-by: Hannes Reinecke <hare@suse.de>
Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c44
1 files changed, 14 insertions, 30 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index efcbcd182863..aa028d8ae774 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -109,6 +109,8 @@ static int sd_suspend_system(struct device *);
static int sd_suspend_runtime(struct device *);
static int sd_resume(struct device *);
static void sd_rescan(struct device *);
+static int sd_init_command(struct scsi_cmnd *SCpnt);
+static void sd_uninit_command(struct scsi_cmnd *SCpnt);
static int sd_done(struct scsi_cmnd *);
static int sd_eh_action(struct scsi_cmnd *, int);
static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
@@ -503,6 +505,8 @@ static struct scsi_driver sd_template = {
.pm = &sd_pm_ops,
},
.rescan = sd_rescan,
+ .init_command = sd_init_command,
+ .uninit_command = sd_uninit_command,
.done = sd_done,
.eh_action = sd_eh_action,
};
@@ -838,9 +842,9 @@ static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
return scsi_setup_blk_pc_cmnd(sdp, rq);
}
-static void sd_unprep_fn(struct request_queue *q, struct request *rq)
+static void sd_uninit_command(struct scsi_cmnd *SCpnt)
{
- struct scsi_cmnd *SCpnt = rq->special;
+ struct request *rq = SCpnt->request;
if (rq->cmd_flags & REQ_DISCARD) {
free_page((unsigned long)rq->buffer);
@@ -853,18 +857,10 @@ static void sd_unprep_fn(struct request_queue *q, struct request *rq)
}
}
-/**
- * sd_prep_fn - build a scsi (read or write) command from
- * information in the request structure.
- * @SCpnt: pointer to mid-level's per scsi command structure that
- * contains request and into which the scsi command is written
- *
- * Returns 1 if successful and 0 if error (or cannot be done now).
- **/
-static int sd_prep_fn(struct request_queue *q, struct request *rq)
+static int sd_init_command(struct scsi_cmnd *SCpnt)
{
- struct scsi_cmnd *SCpnt;
- struct scsi_device *sdp = q->queuedata;
+ struct request *rq = SCpnt->request;
+ struct scsi_device *sdp = SCpnt->device;
struct gendisk *disk = rq->rq_disk;
struct scsi_disk *sdkp;
sector_t block = blk_rq_pos(rq);
@@ -886,12 +882,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
} else if (rq->cmd_flags & REQ_FLUSH) {
ret = scsi_setup_flush_cmnd(sdp, rq);
goto out;
- } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
- ret = scsi_setup_blk_pc_cmnd(sdp, rq);
- goto out;
- } else if (rq->cmd_type != REQ_TYPE_FS) {
- ret = BLKPREP_KILL;
- goto out;
}
ret = scsi_setup_fs_cmnd(sdp, rq);
if (ret != BLKPREP_OK)
@@ -903,11 +893,10 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
* is used for a killable error condition */
ret = BLKPREP_KILL;
- SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
- "sd_prep_fn: block=%llu, "
- "count=%d\n",
- (unsigned long long)block,
- this_count));
+ SCSI_LOG_HLQUEUE(1,
+ scmd_printk(KERN_INFO, SCpnt,
+ "%s: block=%llu, count=%d\n",
+ __func__, (unsigned long long)block, this_count));
if (!sdp || !scsi_device_online(sdp) ||
block + blk_rq_sectors(rq) > get_capacity(disk)) {
@@ -1127,7 +1116,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
*/
ret = BLKPREP_OK;
out:
- return scsi_prep_return(q, rq, ret);
+ return ret;
}
/**
@@ -2878,9 +2867,6 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
sd_revalidate_disk(gd);
- blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
- blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
-
gd->driverfs_dev = &sdp->sdev_gendev;
gd->flags = GENHD_FL_EXT_DEVT;
if (sdp->removable) {
@@ -3028,8 +3014,6 @@ static int sd_remove(struct device *dev)
async_synchronize_full_domain(&scsi_sd_pm_domain);
async_synchronize_full_domain(&scsi_sd_probe_domain);
- blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
- blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
device_del(&sdkp->dev);
del_gendisk(sdkp->disk);
sd_shutdown(dev);