[03/11] scsi: Move sd_pr_type to header to share.

Commit Message

Mike Christie June 3, 2022, 6:55 a.m. UTC

LIO is going to want to do the same block to/from SCSI pr types as sd.c
so this moves the sd_pr_type helper to a new file and adds a helper to
go from the SCSI value to the block one.

Signed-off-by: Mike Christie <[e-mail]>
---
 drivers/scsi/sd.c            | 29 +++++-----------------
 include/scsi/scsi_block_pr.h | 47 ++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 23 deletions(-)
 create mode 100644 include/scsi/scsi_block_pr.h

Comments

Bart Van Assche June 5, 2022, 3:58 a.m. UTC | #1

On 6/2/22 23:55, Mike Christie wrote:
> +static inline char block_pr_type_to_scsi(enum pr_type type)
> +{
> +	switch (type) {
> +	case PR_WRITE_EXCLUSIVE:
> +		return 0x01;
> +	case PR_EXCLUSIVE_ACCESS:
> +		return 0x03;
> +	case PR_WRITE_EXCLUSIVE_REG_ONLY:
> +		return 0x05;
> +	case PR_EXCLUSIVE_ACCESS_REG_ONLY:
> +		return 0x06;
> +	case PR_WRITE_EXCLUSIVE_ALL_REGS:
> +		return 0x07;
> +	case PR_EXCLUSIVE_ACCESS_ALL_REGS:
> +		return 0x08;
> +	default:
> +		return 0;
> +	}
> +};
> +
> +static inline enum pr_type scsi_pr_type_to_block(char type)
> +{
> +	switch (type) {
> +	case 0x01:
> +		return PR_WRITE_EXCLUSIVE;
> +	case 0x03:
> +		return PR_EXCLUSIVE_ACCESS;
> +	case 0x05:
> +		return PR_WRITE_EXCLUSIVE_REG_ONLY;
> +	case 0x06:
> +		return PR_EXCLUSIVE_ACCESS_REG_ONLY;
> +	case 0x07:
> +		return PR_WRITE_EXCLUSIVE_ALL_REGS;
> +	case 0x08:
> +		return PR_EXCLUSIVE_ACCESS_ALL_REGS;
> +	default:
> +		return 0;
> +	}
> +}

Since 'char' is used above to represent a single byte, please use u8 or 
uint8_t instead.

Thanks,

Bart.

Christoph Hellwig June 20, 2022, 7:13 a.m. UTC | #2

Looks good modulo the u8 cleanup suggestion:

Reviewed-by: Christoph Hellwig <[e-mail]>

Patch

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 24e61647064c..765fca0f38c7 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -67,6 +67,7 @@ 
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_ioctl.h>
 #include <scsi/scsicam.h>
+#include <scsi/scsi_block_pr.h>
 
 #include "sd.h"
 #include "scsi_priv.h"
@@ -1683,26 +1684,6 @@  static int sd_get_unique_id(struct gendisk *disk, u8 id[16],
 	return ret;
 }
 
-static char sd_pr_type(enum pr_type type)
-{
-	switch (type) {
-	case PR_WRITE_EXCLUSIVE:
-		return 0x01;
-	case PR_EXCLUSIVE_ACCESS:
-		return 0x03;
-	case PR_WRITE_EXCLUSIVE_REG_ONLY:
-		return 0x05;
-	case PR_EXCLUSIVE_ACCESS_REG_ONLY:
-		return 0x06;
-	case PR_WRITE_EXCLUSIVE_ALL_REGS:
-		return 0x07;
-	case PR_EXCLUSIVE_ACCESS_ALL_REGS:
-		return 0x08;
-	default:
-		return 0;
-	}
-};
-
 static int sd_pr_out_command(struct block_device *bdev, u8 sa,
 		u64 key, u64 sa_key, u8 type, u8 flags)
 {
@@ -1749,19 +1730,21 @@  static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
 {
 	if (flags)
 		return -EOPNOTSUPP;
-	return sd_pr_out_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
+	return sd_pr_out_command(bdev, 0x01, key, 0,
+				 block_pr_type_to_scsi(type), 0);
 }
 
 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
 {
-	return sd_pr_out_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
+	return sd_pr_out_command(bdev, 0x02, key, 0,
+				 block_pr_type_to_scsi(type), 0);
 }
 
 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
 		enum pr_type type, bool abort)
 {
 	return sd_pr_out_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
-			     sd_pr_type(type), 0);
+				 block_pr_type_to_scsi(type), 0);
 }
 
 static int sd_pr_clear(struct block_device *bdev, u64 key)
diff --git a/include/scsi/scsi_block_pr.h b/include/scsi/scsi_block_pr.h
new file mode 100644
index 000000000000..7d137c067331
--- /dev/null
+++ b/include/scsi/scsi_block_pr.h
@@ -0,0 +1,47 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SCSI_BLOCK_PR_H
+#define _SCSI_BLOCK_PR_H
+
+#include <uapi/linux/pr.h>
+
+static inline char block_pr_type_to_scsi(enum pr_type type)
+{
+	switch (type) {
+	case PR_WRITE_EXCLUSIVE:
+		return 0x01;
+	case PR_EXCLUSIVE_ACCESS:
+		return 0x03;
+	case PR_WRITE_EXCLUSIVE_REG_ONLY:
+		return 0x05;
+	case PR_EXCLUSIVE_ACCESS_REG_ONLY:
+		return 0x06;
+	case PR_WRITE_EXCLUSIVE_ALL_REGS:
+		return 0x07;
+	case PR_EXCLUSIVE_ACCESS_ALL_REGS:
+		return 0x08;
+	default:
+		return 0;
+	}
+};
+
+static inline enum pr_type scsi_pr_type_to_block(char type)
+{
+	switch (type) {
+	case 0x01:
+		return PR_WRITE_EXCLUSIVE;
+	case 0x03:
+		return PR_EXCLUSIVE_ACCESS;
+	case 0x05:
+		return PR_WRITE_EXCLUSIVE_REG_ONLY;
+	case 0x06:
+		return PR_EXCLUSIVE_ACCESS_REG_ONLY;
+	case 0x07:
+		return PR_WRITE_EXCLUSIVE_ALL_REGS;
+	case 0x08:
+		return PR_EXCLUSIVE_ACCESS_ALL_REGS;
+	default:
+		return 0;
+	}
+}
+
+#endif