mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-04 02:06:43 +07:00
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>
This commit is contained in:
Christoph Hellwig
parent
bc85dc500f
commit
a1b73fc194
@ -1073,15 +1073,7 @@ static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev,
|
||||
|
||||
int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
|
||||
{
|
||||
struct scsi_cmnd *cmd;
|
||||
int ret = scsi_prep_state_check(sdev, req);
|
||||
|
||||
if (ret != BLKPREP_OK)
|
||||
return ret;
|
||||
|
||||
cmd = scsi_get_cmd_from_req(sdev, req);
|
||||
if (unlikely(!cmd))
|
||||
return BLKPREP_DEFER;
|
||||
struct scsi_cmnd *cmd = req->special;
|
||||
|
||||
/*
|
||||
* BLOCK_PC requests may transfer data, in which case they must
|
||||
@ -1125,15 +1117,11 @@ EXPORT_SYMBOL(scsi_setup_blk_pc_cmnd);
|
||||
*/
|
||||
int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
|
||||
{
|
||||
struct scsi_cmnd *cmd;
|
||||
int ret = scsi_prep_state_check(sdev, req);
|
||||
|
||||
if (ret != BLKPREP_OK)
|
||||
return ret;
|
||||
struct scsi_cmnd *cmd = req->special;
|
||||
|
||||
if (unlikely(sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh
|
||||
&& sdev->scsi_dh_data->scsi_dh->prep_fn)) {
|
||||
ret = sdev->scsi_dh_data->scsi_dh->prep_fn(sdev, req);
|
||||
int ret = sdev->scsi_dh_data->scsi_dh->prep_fn(sdev, req);
|
||||
if (ret != BLKPREP_OK)
|
||||
return ret;
|
||||
}
|
||||
@ -1143,16 +1131,13 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
|
||||
*/
|
||||
BUG_ON(!req->nr_phys_segments);
|
||||
|
||||
cmd = scsi_get_cmd_from_req(sdev, req);
|
||||
if (unlikely(!cmd))
|
||||
return BLKPREP_DEFER;
|
||||
|
||||
memset(cmd->cmnd, 0, BLK_MAX_CDB);
|
||||
return scsi_init_io(cmd, GFP_ATOMIC);
|
||||
}
|
||||
EXPORT_SYMBOL(scsi_setup_fs_cmnd);
|
||||
|
||||
int scsi_prep_state_check(struct scsi_device *sdev, struct request *req)
|
||||
static int
|
||||
scsi_prep_state_check(struct scsi_device *sdev, struct request *req)
|
||||
{
|
||||
int ret = BLKPREP_OK;
|
||||
|
||||
@ -1204,9 +1189,9 @@ int scsi_prep_state_check(struct scsi_device *sdev, struct request *req)
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(scsi_prep_state_check);
|
||||
|
||||
int scsi_prep_return(struct request_queue *q, struct request *req, int ret)
|
||||
static int
|
||||
scsi_prep_return(struct request_queue *q, struct request *req, int ret)
|
||||
{
|
||||
struct scsi_device *sdev = q->queuedata;
|
||||
|
||||
@ -1237,18 +1222,44 @@ int scsi_prep_return(struct request_queue *q, struct request *req, int ret)
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(scsi_prep_return);
|
||||
|
||||
int scsi_prep_fn(struct request_queue *q, struct request *req)
|
||||
static int scsi_prep_fn(struct request_queue *q, struct request *req)
|
||||
{
|
||||
struct scsi_device *sdev = q->queuedata;
|
||||
int ret = BLKPREP_KILL;
|
||||
struct scsi_cmnd *cmd;
|
||||
int ret;
|
||||
|
||||
if (req->cmd_type == REQ_TYPE_BLOCK_PC)
|
||||
ret = scsi_prep_state_check(sdev, req);
|
||||
if (ret != BLKPREP_OK)
|
||||
goto out;
|
||||
|
||||
cmd = scsi_get_cmd_from_req(sdev, req);
|
||||
if (unlikely(!cmd)) {
|
||||
ret = BLKPREP_DEFER;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (req->cmd_type == REQ_TYPE_FS)
|
||||
ret = scsi_cmd_to_driver(cmd)->init_command(cmd);
|
||||
else if (req->cmd_type == REQ_TYPE_BLOCK_PC)
|
||||
ret = scsi_setup_blk_pc_cmnd(sdev, req);
|
||||
else
|
||||
ret = BLKPREP_KILL;
|
||||
|
||||
out:
|
||||
return scsi_prep_return(q, req, ret);
|
||||
}
|
||||
EXPORT_SYMBOL(scsi_prep_fn);
|
||||
|
||||
static void scsi_unprep_fn(struct request_queue *q, struct request *req)
|
||||
{
|
||||
if (req->cmd_type == REQ_TYPE_FS) {
|
||||
struct scsi_cmnd *cmd = req->special;
|
||||
struct scsi_driver *drv = scsi_cmd_to_driver(cmd);
|
||||
|
||||
if (drv->uninit_command)
|
||||
drv->uninit_command(cmd);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* scsi_dev_queue_ready: if we can send requests to sdev, return 1 else
|
||||
@ -1669,6 +1680,7 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev)
|
||||
return NULL;
|
||||
|
||||
blk_queue_prep_rq(q, scsi_prep_fn);
|
||||
blk_queue_unprep_rq(q, scsi_unprep_fn);
|
||||
blk_queue_softirq_done(q, scsi_softirq_done);
|
||||
blk_queue_rq_timed_out(q, scsi_times_out);
|
||||
blk_queue_lld_busy(q, scsi_lld_busy);
|
||||
|
||||
@ -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);
|
||||
|
||||
@ -79,6 +79,7 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
|
||||
static DEFINE_MUTEX(sr_mutex);
|
||||
static int sr_probe(struct device *);
|
||||
static int sr_remove(struct device *);
|
||||
static int sr_init_command(struct scsi_cmnd *SCpnt);
|
||||
static int sr_done(struct scsi_cmnd *);
|
||||
static int sr_runtime_suspend(struct device *dev);
|
||||
|
||||
@ -94,6 +95,7 @@ static struct scsi_driver sr_template = {
|
||||
.remove = sr_remove,
|
||||
.pm = &sr_pm_ops,
|
||||
},
|
||||
.init_command = sr_init_command,
|
||||
.done = sr_done,
|
||||
};
|
||||
|
||||
@ -378,21 +380,14 @@ static int sr_done(struct scsi_cmnd *SCpnt)
|
||||
return good_bytes;
|
||||
}
|
||||
|
||||
static int sr_prep_fn(struct request_queue *q, struct request *rq)
|
||||
static int sr_init_command(struct scsi_cmnd *SCpnt)
|
||||
{
|
||||
int block = 0, this_count, s_size;
|
||||
struct scsi_cd *cd;
|
||||
struct scsi_cmnd *SCpnt;
|
||||
struct scsi_device *sdp = q->queuedata;
|
||||
struct request *rq = SCpnt->request;
|
||||
struct scsi_device *sdp = SCpnt->device;
|
||||
int ret;
|
||||
|
||||
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)
|
||||
goto out;
|
||||
@ -517,7 +512,7 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
|
||||
*/
|
||||
ret = BLKPREP_OK;
|
||||
out:
|
||||
return scsi_prep_return(q, rq, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int sr_block_open(struct block_device *bdev, fmode_t mode)
|
||||
@ -718,7 +713,6 @@ static int sr_probe(struct device *dev)
|
||||
|
||||
/* FIXME: need to handle a get_capabilities failure properly ?? */
|
||||
get_capabilities(cd);
|
||||
blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
|
||||
sr_vendor_init(cd);
|
||||
|
||||
disk->driverfs_dev = &sdev->sdev_gendev;
|
||||
@ -993,7 +987,6 @@ static int sr_remove(struct device *dev)
|
||||
|
||||
scsi_autopm_get_device(cd->device);
|
||||
|
||||
blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
|
||||
del_gendisk(cd->disk);
|
||||
|
||||
mutex_lock(&sr_ref_mutex);
|
||||
|
||||
@ -4,17 +4,17 @@
|
||||
#include <linux/device.h>
|
||||
|
||||
struct module;
|
||||
struct request;
|
||||
struct scsi_cmnd;
|
||||
struct scsi_device;
|
||||
struct request;
|
||||
struct request_queue;
|
||||
|
||||
|
||||
struct scsi_driver {
|
||||
struct module *owner;
|
||||
struct device_driver gendrv;
|
||||
|
||||
void (*rescan)(struct device *);
|
||||
int (*init_command)(struct scsi_cmnd *);
|
||||
void (*uninit_command)(struct scsi_cmnd *);
|
||||
int (*done)(struct scsi_cmnd *);
|
||||
int (*eh_action)(struct scsi_cmnd *, int);
|
||||
};
|
||||
@ -31,8 +31,5 @@ extern int scsi_register_interface(struct class_interface *);
|
||||
|
||||
int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req);
|
||||
int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req);
|
||||
int scsi_prep_state_check(struct scsi_device *sdev, struct request *req);
|
||||
int scsi_prep_return(struct request_queue *q, struct request *req, int ret);
|
||||
int scsi_prep_fn(struct request_queue *, struct request *);
|
||||
|
||||
#endif /* _SCSI_SCSI_DRIVER_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user