scsi: return blk_status_t from scsi_init_io and ->init_command

Replace the old BLKPREP_* values with the BLK_STS_ ones that they are
converted to later anyway.

Reviewed-by: Johannes Thumshirn <[e-mail]>
Reviewed-by: Bart Van Assche <[e-mail]>
Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

drivers/scsi/scsi_lib.c

···
 		scsi_io_completion_action(cmd, result);
 }
 
-static int scsi_init_sgtable(struct request *req, struct scsi_data_buffer *sdb)
+static blk_status_t scsi_init_sgtable(struct request *req,
+		struct scsi_data_buffer *sdb)
 {
 	int count;
 
···
 	 */
 	if (unlikely(sg_alloc_table_chained(&sdb->table,
 			blk_rq_nr_phys_segments(req), sdb->table.sgl)))
-		return BLKPREP_DEFER;
+		return BLK_STS_RESOURCE;
 
 	/* 
 	 * Next, walk the list, and fill in the addresses and sizes of
···
 	BUG_ON(count > sdb->table.nents);
 	sdb->table.nents = count;
 	sdb->length = blk_rq_payload_bytes(req);
-	return BLKPREP_OK;
+	return BLK_STS_OK;
 }
 
 /*
···
  *
  * Arguments:   cmd   - Command descriptor we wish to initialize
  *
- * Returns:     0 on success
- *		BLKPREP_DEFER if the failure is retryable
- *		BLKPREP_KILL if the failure is fatal
+ * Returns:     BLK_STS_OK on success
+ *		BLK_STS_RESOURCE if the failure is retryable
+ *		BLK_STS_IOERR if the failure is fatal
  */
-int scsi_init_io(struct scsi_cmnd *cmd)
+blk_status_t scsi_init_io(struct scsi_cmnd *cmd)
 {
 	struct request *rq = cmd->request;
-	int error = BLKPREP_KILL;
+	blk_status_t ret;
 
 	if (WARN_ON_ONCE(!blk_rq_nr_phys_segments(rq)))
-		return BLKPREP_KILL;
+		return BLK_STS_IOERR;
 
-	error = scsi_init_sgtable(rq, &cmd->sdb);
-	if (error)
-		return error;
+	ret = scsi_init_sgtable(rq, &cmd->sdb);
+	if (ret)
+		return ret;
 
 	if (blk_bidi_rq(rq)) {
-		error = scsi_init_sgtable(rq->next_rq, rq->next_rq->special);
-		if (error)
+		ret = scsi_init_sgtable(rq->next_rq, rq->next_rq->special);
+		if (ret)
 			goto out_free_sgtables;
 	}
 
···
 			 * queues a command to a device on an adapter
 			 * that does not support DIX.
 			 */
-			error = BLKPREP_KILL;
+			ret = BLK_STS_IOERR;
 			goto out_free_sgtables;
 		}
 
···
 
 		if (sg_alloc_table_chained(&prot_sdb->table, ivecs,
 				prot_sdb->table.sgl)) {
-			error = BLKPREP_DEFER;
+			ret = BLK_STS_RESOURCE;
 			goto out_free_sgtables;
 		}
 
···
 		cmd->prot_sdb->table.nents = count;
 	}
 
-	return BLKPREP_OK;
+	return BLK_STS_OK;
 out_free_sgtables:
 	scsi_mq_free_sgtables(cmd);
-	return error;
+	return ret;
 }
 EXPORT_SYMBOL(scsi_init_io);
 
···
 	 * submit a request without an attached bio.
 	 */
 	if (req->bio) {
-		int ret = scsi_init_io(cmd);
-		if (unlikely(ret))
-			return prep_to_mq(ret);
+		blk_status_t ret = scsi_init_io(cmd);
+		if (unlikely(ret != BLK_STS_OK))
+			return ret;
 	} else {
 		BUG_ON(blk_rq_bytes(req));
 
···
 
 	cmd->cmnd = scsi_req(req)->cmd = scsi_req(req)->__cmd;
 	memset(cmd->cmnd, 0, BLK_MAX_CDB);
-	return prep_to_mq(scsi_cmd_to_driver(cmd)->init_command(cmd));
+	return scsi_cmd_to_driver(cmd)->init_command(cmd);
 }
 
 static blk_status_t scsi_setup_cmnd(struct scsi_device *sdev,

drivers/scsi/sd.c

···
 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 blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 static int sd_done(struct scsi_cmnd *);
 static void sd_eh_reset(struct scsi_cmnd *);
···
 	blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 }
 
-static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
+static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 {
 	struct scsi_device *sdp = cmd->device;
 	struct request *rq = cmd->request;
···
 
 	rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 	if (!rq->special_vec.bv_page)
-		return BLKPREP_DEFER;
+		return BLK_STS_RESOURCE;
 	rq->special_vec.bv_offset = 0;
 	rq->special_vec.bv_len = data_len;
 	rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
···
 	return scsi_init_io(cmd);
 }
 
-static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, bool unmap)
+static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
+		bool unmap)
 {
 	struct scsi_device *sdp = cmd->device;
 	struct request *rq = cmd->request;
···
 
 	rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 	if (!rq->special_vec.bv_page)
-		return BLKPREP_DEFER;
+		return BLK_STS_RESOURCE;
 	rq->special_vec.bv_offset = 0;
 	rq->special_vec.bv_len = data_len;
 	rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
···
 	return scsi_init_io(cmd);
 }
 
-static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap)
+static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
+		bool unmap)
 {
 	struct scsi_device *sdp = cmd->device;
 	struct request *rq = cmd->request;
···
 
 	rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 	if (!rq->special_vec.bv_page)
-		return BLKPREP_DEFER;
+		return BLK_STS_RESOURCE;
 	rq->special_vec.bv_offset = 0;
 	rq->special_vec.bv_len = data_len;
 	rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
···
 	return scsi_init_io(cmd);
 }
 
-static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
+static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 {
 	struct request *rq = cmd->request;
 	struct scsi_device *sdp = cmd->device;
···
 	}
 
 	if (sdp->no_write_same)
-		return BLKPREP_INVALID;
+		return BLK_STS_TARGET;
 
 	if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
 		return sd_setup_write_same16_cmnd(cmd, false);
···
  * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
  * the preference indicated by the target device.
  **/
-static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
+static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
 {
 	struct request *rq = cmd->request;
 	struct scsi_device *sdp = cmd->device;
···
 	sector_t sector = blk_rq_pos(rq);
 	unsigned int nr_sectors = blk_rq_sectors(rq);
 	unsigned int nr_bytes = blk_rq_bytes(rq);
-	int ret;
+	blk_status_t ret;
 
 	if (sdkp->device->no_write_same)
-		return BLKPREP_INVALID;
+		return BLK_STS_TARGET;
 
 	BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
 
···
 	return ret;
 }
 
-static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
+static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
 {
 	struct request *rq = cmd->request;
 
···
 	cmd->allowed = SD_MAX_RETRIES;
 
 	rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
-	return BLKPREP_OK;
+	return BLK_STS_OK;
 }
 
-static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
+static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
 {
 	struct request *rq = SCpnt->request;
 	struct scsi_device *sdp = SCpnt->device;
···
 	sector_t threshold;
 	unsigned int this_count = blk_rq_sectors(rq);
 	unsigned int dif, dix;
-	int ret;
 	unsigned char protect;
+	blk_status_t ret;
 
 	ret = scsi_init_io(SCpnt);
-	if (ret != BLKPREP_OK)
+	if (ret != BLK_STS_OK)
 		return ret;
 	WARN_ON_ONCE(SCpnt != rq->special);
-
-	/* from here on until we're complete, any goto out
-	 * is used for a killable error condition */
-	ret = BLKPREP_KILL;
 
 	SCSI_LOG_HLQUEUE(1,
 		scmd_printk(KERN_INFO, SCpnt,
···
 						blk_rq_sectors(rq)));
 		SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 						"Retry with 0x%p\n", SCpnt));
-		goto out;
+		return BLK_STS_IOERR;
 	}
 
 	if (sdp->changed) {
···
 		 * the changed bit has been reset
 		 */
 		/* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
-		goto out;
+		return BLK_STS_IOERR;
 	}
 
 	/*
···
 		if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
 			scmd_printk(KERN_ERR, SCpnt,
 				    "Bad block number requested\n");
-			goto out;
-		} else {
-			block = block >> 1;
-			this_count = this_count >> 1;
+			return BLK_STS_IOERR;
 		}
+		block = block >> 1;
+		this_count = this_count >> 1;
 	}
 	if (sdp->sector_size == 2048) {
 		if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
 			scmd_printk(KERN_ERR, SCpnt,
 				    "Bad block number requested\n");
-			goto out;
-		} else {
-			block = block >> 2;
-			this_count = this_count >> 2;
+			return BLK_STS_IOERR;
 		}
+		block = block >> 2;
+		this_count = this_count >> 2;
 	}
 	if (sdp->sector_size == 4096) {
 		if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
 			scmd_printk(KERN_ERR, SCpnt,
 				    "Bad block number requested\n");
-			goto out;
-		} else {
-			block = block >> 3;
-			this_count = this_count >> 3;
+			return BLK_STS_IOERR;
 		}
+		block = block >> 3;
+		this_count = this_count >> 3;
 	}
 	if (rq_data_dir(rq) == WRITE) {
 		SCpnt->cmnd[0] = WRITE_6;
···
 		SCpnt->cmnd[0] = READ_6;
 	} else {
 		scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
-		goto out;
+		return BLK_STS_IOERR;
 	}
 
 	SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
···
 	if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
 		SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
 
-		if (unlikely(SCpnt->cmnd == NULL)) {
-			ret = BLKPREP_DEFER;
-			goto out;
-		}
+		if (unlikely(!SCpnt->cmnd))
+			return BLK_STS_RESOURCE;
 
 		SCpnt->cmd_len = SD_EXT_CDB_SIZE;
 		memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
···
 			 */
 			scmd_printk(KERN_ERR, SCpnt,
 				    "FUA write on READ/WRITE(6) drive\n");
-			goto out;
+			return BLK_STS_IOERR;
 		}
 
 		SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
···
 	 * This indicates that the command is ready from our end to be
 	 * queued.
 	 */
-	ret = BLKPREP_OK;
- out:
-	return ret;
+	return BLK_STS_OK;
 }
 
-static int sd_init_command(struct scsi_cmnd *cmd)
+static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
 {
 	struct request *rq = cmd->request;
 
···
 		case SD_LBP_ZERO:
 			return sd_setup_write_same10_cmnd(cmd, false);
 		default:
-			return BLKPREP_INVALID;
+			return BLK_STS_TARGET;
 		}
 	case REQ_OP_WRITE_ZEROES:
 		return sd_setup_write_zeroes_cmnd(cmd);
···
 		return sd_zbc_setup_reset_cmnd(cmd);
 	default:
 		WARN_ON_ONCE(1);
-		return BLKPREP_KILL;
+		return BLK_STS_NOTSUPP;
 	}
 }
 

drivers/scsi/sd.h

···
 
 extern int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buffer);
 extern void sd_zbc_print_zones(struct scsi_disk *sdkp);
-extern int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd);
+extern blk_status_t sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd);
 extern void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
 			    struct scsi_sense_hdr *sshdr);
 extern int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
···
 
 static inline void sd_zbc_print_zones(struct scsi_disk *sdkp) {}
 
-static inline int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
+static inline blk_status_t sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
 {
-	return BLKPREP_INVALID;
+	return BLK_STS_TARGET;
 }
 
 static inline void sd_zbc_complete(struct scsi_cmnd *cmd,

drivers/scsi/sd_zbc.c

···
  *
  * Called from sd_init_command() for a REQ_OP_ZONE_RESET request.
  */
-int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
+blk_status_t sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
 {
 	struct request *rq = cmd->request;
 	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
···
 
 	if (!sd_is_zoned(sdkp))
 		/* Not a zoned device */
-		return BLKPREP_KILL;
+		return BLK_STS_IOERR;
 
 	if (sdkp->device->changed)
-		return BLKPREP_KILL;
+		return BLK_STS_IOERR;
 
 	if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
 		/* Unaligned request */
-		return BLKPREP_KILL;
+		return BLK_STS_IOERR;
 
 	cmd->cmd_len = 16;
 	memset(cmd->cmnd, 0, cmd->cmd_len);
···
 	cmd->transfersize = 0;
 	cmd->allowed = 0;
 
-	return BLKPREP_OK;
+	return BLK_STS_OK;
 }
 
 /**

drivers/scsi/sr.c

···
 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 blk_status_t sr_init_command(struct scsi_cmnd *SCpnt);
 static int sr_done(struct scsi_cmnd *);
 static int sr_runtime_suspend(struct device *dev);
 
···
 	return good_bytes;
 }
 
-static int sr_init_command(struct scsi_cmnd *SCpnt)
+static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt)
 {
 	int block = 0, this_count, s_size;
 	struct scsi_cd *cd;
 	struct request *rq = SCpnt->request;
-	int ret;
+	blk_status_t ret;
 
 	ret = scsi_init_io(SCpnt);
-	if (ret != BLKPREP_OK)
+	if (ret != BLK_STS_OK)
 		goto out;
 	WARN_ON_ONCE(SCpnt != rq->special);
 	cd = scsi_cd(rq->rq_disk);
 
 	/* from here on until we're complete, any goto out
 	 * is used for a killable error condition */
-	ret = BLKPREP_KILL;
+	ret = BLK_STS_IOERR;
 
 	SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
 		"Doing sr request, block = %d\n", block));
···
 	 * This indicates that the command is ready from our end to be
 	 * queued.
 	 */
-	ret = BLKPREP_OK;
+	ret = BLK_STS_OK;
  out:
 	return ret;
 }

include/scsi/scsi_cmnd.h

···
 				 size_t *offset, size_t *len);
 extern void scsi_kunmap_atomic_sg(void *virt);
 
-extern int scsi_init_io(struct scsi_cmnd *cmd);
+extern blk_status_t scsi_init_io(struct scsi_cmnd *cmd);
 
 #ifdef CONFIG_SCSI_DMA
 extern int scsi_dma_map(struct scsi_cmnd *cmd);

include/scsi/scsi_driver.h

···
 #ifndef _SCSI_SCSI_DRIVER_H
 #define _SCSI_SCSI_DRIVER_H
 
+#include <linux/blk_types.h>
 #include <linux/device.h>
 
 struct module;
···
 	struct device_driver	gendrv;
 
 	void (*rescan)(struct device *);
-	int (*init_command)(struct scsi_cmnd *);
+	blk_status_t (*init_command)(struct scsi_cmnd *);
 	void (*uninit_command)(struct scsi_cmnd *);
 	int (*done)(struct scsi_cmnd *);
 	int (*eh_action)(struct scsi_cmnd *, int);