[PATCH 0/5] ZBC support clenaup and fixes

[PATCH 0/5] ZBC support clenaup and fixes

[Damien Le Moal]

Martin,

First part of the "scsi-mq support for ZBC disks" series that is only scsi
specific. These patches are just cleanups with only one bug fix (last pacth)
and do not functionally change anything.

The remaining rework of the zone locking including scsi-mq support is still
ongoing and will be sent later.

Please consider these for addition to 4.15.

Damien Le Moal (5):
  scsi: sd_zbc: Move ZBC declarations to scsi_proto.h
  scsi: sd_zbc: Fix comments and indentation
  scsi: sd_zbc: Rearrange code
  scsi: sd_zbc: Use well defined macros
  scsi: sd_zbc: Fix sd_zbc_read_zoned_characteristics()

 drivers/scsi/scsi_lib.c   |   5 +-
 drivers/scsi/sd_zbc.c     | 169 ++++++++++++++++++++++++++++++----------------
 include/scsi/scsi_proto.h |  45 +++++++++---
 3 files changed, 150 insertions(+), 69 deletions(-)

-- 
2.13.6

[PATCH 1/5] scsi: sd_zbc: Move ZBC declarations to scsi_proto.h

[Damien Le Moal]

Move standard macro definitions for the zone types and zone conditions
to scsi_proto.h together with the definitions related to the
REPORT ZONES command. While at it, define all values in the enums to
be clear.

Also remove unnecessary includes in sd_zbc.c.

No functional change is introduced by this patch.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/sd_zbc.c     | 24 ------------------------
 include/scsi/scsi_proto.h | 45 ++++++++++++++++++++++++++++++++++-----------
 2 files changed, 34 insertions(+), 35 deletions(-)

diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index 8aa54779aac1..692c8cbc7ed8 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -28,32 +28,8 @@
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_dbg.h>
-#include <scsi/scsi_device.h>
-#include <scsi/scsi_driver.h>
-#include <scsi/scsi_host.h>
-#include <scsi/scsi_eh.h>
 
 #include "sd.h"
-#include "scsi_priv.h"
-
-enum zbc_zone_type {
-	ZBC_ZONE_TYPE_CONV = 0x1,
-	ZBC_ZONE_TYPE_SEQWRITE_REQ,
-	ZBC_ZONE_TYPE_SEQWRITE_PREF,
-	ZBC_ZONE_TYPE_RESERVED,
-};
-
-enum zbc_zone_cond {
-	ZBC_ZONE_COND_NO_WP,
-	ZBC_ZONE_COND_EMPTY,
-	ZBC_ZONE_COND_IMP_OPEN,
-	ZBC_ZONE_COND_EXP_OPEN,
-	ZBC_ZONE_COND_CLOSED,
-	ZBC_ZONE_COND_READONLY = 0xd,
-	ZBC_ZONE_COND_FULL,
-	ZBC_ZONE_COND_OFFLINE,
-};
 
 /**
  * Convert a zone descriptor to a zone struct.
diff --git a/include/scsi/scsi_proto.h b/include/scsi/scsi_proto.h
index 8c285d9a06d8..39130a9c05bf 100644
--- a/include/scsi/scsi_proto.h
+++ b/include/scsi/scsi_proto.h
@@ -301,19 +301,42 @@ struct scsi_lun {
 
 /* Reporting options for REPORT ZONES */
 enum zbc_zone_reporting_options {
-	ZBC_ZONE_REPORTING_OPTION_ALL = 0,
-	ZBC_ZONE_REPORTING_OPTION_EMPTY,
-	ZBC_ZONE_REPORTING_OPTION_IMPLICIT_OPEN,
-	ZBC_ZONE_REPORTING_OPTION_EXPLICIT_OPEN,
-	ZBC_ZONE_REPORTING_OPTION_CLOSED,
-	ZBC_ZONE_REPORTING_OPTION_FULL,
-	ZBC_ZONE_REPORTING_OPTION_READONLY,
-	ZBC_ZONE_REPORTING_OPTION_OFFLINE,
-	ZBC_ZONE_REPORTING_OPTION_NEED_RESET_WP = 0x10,
-	ZBC_ZONE_REPORTING_OPTION_NON_SEQWRITE,
-	ZBC_ZONE_REPORTING_OPTION_NON_WP = 0x3f,
+	ZBC_ZONE_REPORTING_OPTION_ALL		= 0x00,
+	ZBC_ZONE_REPORTING_OPTION_EMPTY		= 0x01,
+	ZBC_ZONE_REPORTING_OPTION_IMPLICIT_OPEN	= 0x02,
+	ZBC_ZONE_REPORTING_OPTION_EXPLICIT_OPEN	= 0x03,
+	ZBC_ZONE_REPORTING_OPTION_CLOSED	= 0x04,
+	ZBC_ZONE_REPORTING_OPTION_FULL		= 0x05,
+	ZBC_ZONE_REPORTING_OPTION_READONLY	= 0x06,
+	ZBC_ZONE_REPORTING_OPTION_OFFLINE	= 0x07,
+	/* 0x08 to 0x0f are reserved */
+	ZBC_ZONE_REPORTING_OPTION_NEED_RESET_WP	= 0x10,
+	ZBC_ZONE_REPORTING_OPTION_NON_SEQWRITE	= 0x11,
+	/* 0x12 to 0x3e are reserved */
+	ZBC_ZONE_REPORTING_OPTION_NON_WP	= 0x3f,
 };
 
 #define ZBC_REPORT_ZONE_PARTIAL 0x80
 
+/* Zone types of REPORT ZONES zone descriptors */
+enum zbc_zone_type {
+	ZBC_ZONE_TYPE_CONV		= 0x1,
+	ZBC_ZONE_TYPE_SEQWRITE_REQ	= 0x2,
+	ZBC_ZONE_TYPE_SEQWRITE_PREF	= 0x3,
+	/* 0x4 to 0xf are reserved */
+};
+
+/* Zone conditions of REPORT ZONES zone descriptors */
+enum zbc_zone_cond {
+	ZBC_ZONE_COND_NO_WP		= 0x0,
+	ZBC_ZONE_COND_EMPTY		= 0x1,
+	ZBC_ZONE_COND_IMP_OPEN		= 0x2,
+	ZBC_ZONE_COND_EXP_OPEN		= 0x3,
+	ZBC_ZONE_COND_CLOSED		= 0x4,
+	/* 0x5 to 0xc are reserved */
+	ZBC_ZONE_COND_READONLY		= 0xd,
+	ZBC_ZONE_COND_FULL		= 0xe,
+	ZBC_ZONE_COND_OFFLINE		= 0xf,
+};
+
 #endif /* _SCSI_PROTO_H_ */
-- 
2.13.6

[PATCH 2/5] scsi: sd_zbc: Fix comments and indentation

[Damien Le Moal]

Fix comments style (use kernel-doc style) and content to clarify some
functions. Also fix some functions signature indentation and remove a
useless blank line in sd_zbc_read_zones().

No functional change is introduced by this patch.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/scsi_lib.c |   5 ++-
 drivers/scsi/sd_zbc.c   | 117 +++++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 104 insertions(+), 18 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 9cf6a80fe297..c72b97a74906 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1752,7 +1752,10 @@ static void scsi_done(struct scsi_cmnd *cmd)
  *
  * Returns:     Nothing
  *
- * Lock status: IO request lock assumed to be held when called.
+ * Lock status: request queue lock assumed to be held when called.
+ *
+ * Note: See sd_zbc.c sd_zbc_write_lock_zone() for write order
+ * protection for ZBC disks.
  */
 static void scsi_request_fn(struct request_queue *q)
 	__releases(q->queue_lock)
diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index 692c8cbc7ed8..023f705ae235 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -32,10 +32,14 @@
 #include "sd.h"
 
 /**
- * Convert a zone descriptor to a zone struct.
+ * sd_zbc_parse_report - Convert a zone descriptor to a struct blk_zone,
+ * @sdkp: The disk the report originated from
+ * @buf: Address of the report zone descriptor
+ * @zone: the destination zone structure
+ *
+ * All LBA sized values are converted to 512B sectors unit.
  */
-static void sd_zbc_parse_report(struct scsi_disk *sdkp,
-				u8 *buf,
+static void sd_zbc_parse_report(struct scsi_disk *sdkp, u8 *buf,
 				struct blk_zone *zone)
 {
 	struct scsi_device *sdp = sdkp->device;
@@ -58,7 +62,13 @@ static void sd_zbc_parse_report(struct scsi_disk *sdkp,
 }
 
 /**
- * Issue a REPORT ZONES scsi command.
+ * sd_zbc_report_zones - Issue a REPORT ZONES scsi command.
+ * @sdkp: The target disk
+ * @buf: Buffer to use for the reply
+ * @buflen: the buffer size
+ * @lba: Start LBA of the report
+ *
+ * For internal use during device validation.
  */
 static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
 			       unsigned int buflen, sector_t lba)
@@ -99,6 +109,12 @@ static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
 	return 0;
 }
 
+/**
+ * sd_zbc_setup_report_cmnd - Prepare a REPORT ZONES scsi command
+ * @cmd: The command to setup
+ *
+ * Call in sd_init_command() for a REQ_OP_ZONE_REPORT request.
+ */
 int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
 {
 	struct request *rq = cmd->request;
@@ -141,6 +157,14 @@ int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
 	return BLKPREP_OK;
 }
 
+/**
+ * sd_zbc_report_zones_complete - Process a REPORT ZONES scsi command reply.
+ * @scmd: The completed report zones command
+ * @good_bytes: reply size in bytes
+ *
+ * Convert all reported zone descriptors to struct blk_zone. The conversion
+ * is done in-place, directly in the request specified sg buffer.
+ */
 static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd,
 					 unsigned int good_bytes)
 {
@@ -196,17 +220,32 @@ static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd,
 	local_irq_restore(flags);
 }
 
+/**
+ * sd_zbc_zone_sectors - Get the device zone size in number of 512B sectors.
+ * @sdkp: The target disk
+ */
 static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
 {
 	return logical_to_sectors(sdkp->device, sdkp->zone_blocks);
 }
 
+/**
+ * sd_zbc_zone_no - Get the number of the zone conataining a sector.
+ * @sdkp: The target disk
+ * @sector: 512B sector address contained in the zone
+ */
 static inline unsigned int sd_zbc_zone_no(struct scsi_disk *sdkp,
 					  sector_t sector)
 {
 	return sectors_to_logical(sdkp->device, sector) >> sdkp->zone_shift;
 }
 
+/**
+ * sd_zbc_setup_reset_cmnd - Prepare a RESET WRITE POINTER scsi command.
+ * @cmd: the command to setup
+ *
+ * Called from sd_init_command() for a REQ_OP_ZONE_RESET request.
+ */
 int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
 {
 	struct request *rq = cmd->request;
@@ -239,6 +278,23 @@ int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
 	return BLKPREP_OK;
 }
 
+/**
+ * sd_zbc_write_lock_zone - Write lock a sequential zone.
+ * @cmd: write command
+ *
+ * Called from sd_init_cmd() for write requests (standard write, write same or
+ * write zeroes operations). If the request target zone is not already locked,
+ * the zone is locked and BLKPREP_OK returned, allowing the request to proceed
+ * through dispatch in scsi_request_fn(). Otherwise, BLKPREP_DEFER is returned,
+ * forcing the request to wait for the zone to be unlocked, that is, for the
+ * previously issued write request targeting the same zone to complete.
+ *
+ * This is called from blk_peek_request() context with the queue lock held and
+ * before the request is removed from the scheduler. As a result, multiple
+ * contexts executing concurrently scsi_request_fn() cannot result in write
+ * sequence reordering as only a single write request per zone is allowed to
+ * proceed.
+ */
 int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
 {
 	struct request *rq = cmd->request;
@@ -261,10 +317,7 @@ int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
 	 * Do not issue more than one write at a time per
 	 * zone. This solves write ordering problems due to
 	 * the unlocking of the request queue in the dispatch
-	 * path in the non scsi-mq case. For scsi-mq, this
-	 * also avoids potential write reordering when multiple
-	 * threads running on different CPUs write to the same
-	 * zone (with a synchronized sequential pattern).
+	 * path in the non scsi-mq case.
 	 */
 	if (sdkp->zones_wlock &&
 	    test_and_set_bit(zno, sdkp->zones_wlock))
@@ -276,6 +329,13 @@ int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
 	return BLKPREP_OK;
 }
 
+/**
+ * sd_zbc_write_unlock_zone - Write unlock a sequential zone.
+ * @cmd: write command
+ *
+ * Called from sd_uninit_cmd(). Unlocking the request target zone will allow
+ * dispatching the next write request for the zone.
+ */
 void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd)
 {
 	struct request *rq = cmd->request;
@@ -290,8 +350,16 @@ void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd)
 	}
 }
 
-void sd_zbc_complete(struct scsi_cmnd *cmd,
-		     unsigned int good_bytes,
+/**
+ * sd_zbc_complete - ZBC command post processing.
+ * @cmd: Completed command
+ * @good_bytes: Command reply bytes
+ * @sshdr: command sense header
+ *
+ * Called from sd_done(). Process report zones reply and handle reset zone
+ * and write commands errors.
+ */
+void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
 		     struct scsi_sense_hdr *sshdr)
 {
 	int result = cmd->result;
@@ -336,7 +404,11 @@ void sd_zbc_complete(struct scsi_cmnd *cmd,
 }
 
 /**
- * Read zoned block device characteristics (VPD page B6).
+ * sd_zbc_read_zoned_characteristics - Read zoned block device characteristics
+ * @sdkp: Target disk
+ * @buf: Buffer where to store the VPD page data
+ *
+ * Read VPD page B6.
  */
 static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp,
 					     unsigned char *buf)
@@ -366,10 +438,16 @@ static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp,
 }
 
 /**
- * Check reported capacity.
+ * sd_zbc_check_capacity - Check reported capacity.
+ * @sdkp: Target disk
+ * @buf: Buffer to use for commands
+ *
+ * ZBC drive may report only the capacity of the first conventional zones at
+ * LBA 0. This is indicated by the RC_BASIS field of the read capacity reply.
+ * Check this here. If the disk reported only its conventional zones capacity,
+ * get the total capacity by doing a report zones.
  */
-static int sd_zbc_check_capacity(struct scsi_disk *sdkp,
-				 unsigned char *buf)
+static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf)
 {
 	sector_t lba;
 	int ret;
@@ -399,6 +477,13 @@ static int sd_zbc_check_capacity(struct scsi_disk *sdkp,
 
 #define SD_ZBC_BUF_SIZE 131072
 
+/**
+ * sd_zbc_check_zone_size - Check the device zone sizes
+ * @sdkp: Target disk
+ *
+ * Check that all zones of the device are equal. The last zone can however
+ * be smaller. The zone size must also be a power of two number of LBAs.
+ */
 static int sd_zbc_check_zone_size(struct scsi_disk *sdkp)
 {
 	u64 zone_blocks;
@@ -525,8 +610,7 @@ static int sd_zbc_setup(struct scsi_disk *sdkp)
 	return 0;
 }
 
-int sd_zbc_read_zones(struct scsi_disk *sdkp,
-		      unsigned char *buf)
+int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
 {
 	int ret;
 
@@ -537,7 +621,6 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp,
 		 */
 		return 0;
 
-
 	/* Get zoned block device characteristics */
 	ret = sd_zbc_read_zoned_characteristics(sdkp, buf);
 	if (ret)
-- 
2.13.6

[PATCH 3/5] scsi: sd_zbc: Rearrange code

[Damien Le Moal]

Rearrange sd_zbc_setup() to include use_16_for_rw and use_10_for_rw
assignments and move the calculation of sdkp->zone_shift together
with the assignment of the verified zone_blocks value in
sd_zbc_check_zone_size().

No functional change is introduced by this patch.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
---
 drivers/scsi/sd_zbc.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index 023f705ae235..7dbaf920679e 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -584,6 +584,7 @@ static int sd_zbc_check_zone_size(struct scsi_disk *sdkp)
 	}
 
 	sdkp->zone_blocks = zone_blocks;
+	sdkp->zone_shift = ilog2(zone_blocks);
 
 	return 0;
 }
@@ -591,10 +592,13 @@ static int sd_zbc_check_zone_size(struct scsi_disk *sdkp)
 static int sd_zbc_setup(struct scsi_disk *sdkp)
 {
 
+	/* READ16/WRITE16 is mandatory for ZBC disks */
+	sdkp->device->use_16_for_rw = 1;
+	sdkp->device->use_10_for_rw = 0;
+
 	/* chunk_sectors indicates the zone size */
 	blk_queue_chunk_sectors(sdkp->disk->queue,
 			logical_to_sectors(sdkp->device, sdkp->zone_blocks));
-	sdkp->zone_shift = ilog2(sdkp->zone_blocks);
 	sdkp->nr_zones = sdkp->capacity >> sdkp->zone_shift;
 	if (sdkp->capacity & (sdkp->zone_blocks - 1))
 		sdkp->nr_zones++;
@@ -657,10 +661,6 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buf)
 	if (ret)
 		goto err;
 
-	/* READ16/WRITE16 is mandatory for ZBC disks */
-	sdkp->device->use_16_for_rw = 1;
-	sdkp->device->use_10_for_rw = 0;
-
 	return 0;
 
 err:
-- 
2.13.6

[PATCH 4/5] scsi: sd_zbc: Use well defined macros

[Damien Le Moal]

instead of open coding, use the min() macro to calculate a report zones
reply buffer length in sd_zbc_check_zone_size() and the round_up()
macro for calculating the number of zones in sd_zbc_setup().

No functional change is introduced by this patch.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/sd_zbc.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index 7dbaf920679e..bbad851c1789 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -475,7 +475,7 @@ static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf)
 	return 0;
 }
 
-#define SD_ZBC_BUF_SIZE 131072
+#define SD_ZBC_BUF_SIZE 131072U
 
 /**
  * sd_zbc_check_zone_size - Check the device zone sizes
@@ -526,10 +526,7 @@ static int sd_zbc_check_zone_size(struct scsi_disk *sdkp)
 		/* Parse REPORT ZONES header */
 		list_length = get_unaligned_be32(&buf[0]) + 64;
 		rec = buf + 64;
-		if (list_length < SD_ZBC_BUF_SIZE)
-			buf_len = list_length;
-		else
-			buf_len = SD_ZBC_BUF_SIZE;
+		buf_len = min(list_length, SD_ZBC_BUF_SIZE);
 
 		/* Parse zone descriptors */
 		while (rec < buf + buf_len) {
@@ -599,9 +596,8 @@ static int sd_zbc_setup(struct scsi_disk *sdkp)
 	/* chunk_sectors indicates the zone size */
 	blk_queue_chunk_sectors(sdkp->disk->queue,
 			logical_to_sectors(sdkp->device, sdkp->zone_blocks));
-	sdkp->nr_zones = sdkp->capacity >> sdkp->zone_shift;
-	if (sdkp->capacity & (sdkp->zone_blocks - 1))
-		sdkp->nr_zones++;
+	sdkp->nr_zones =
+		round_up(sdkp->capacity, sdkp->zone_blocks) >> sdkp->zone_shift;
 
 	if (!sdkp->zones_wlock) {
 		sdkp->zones_wlock = kcalloc(BITS_TO_LONGS(sdkp->nr_zones),
-- 
2.13.6

[PATCH 5/5] scsi: sd_zbc: Fix sd_zbc_read_zoned_characteristics()

[Damien Le Moal]

The three values starting at byte 8 of the Zoned Block Device
Characteristics VPD page B6h are 32 bits values, not 64bits. So use
get_unaligned_be32() to retrieve the values and not get_unaligned_be64()

Fixes: 89d947561077 ("sd: Implement support for ZBC devices")
Cc: <stable@vger.kernel.org>

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/sd_zbc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index bbad851c1789..27793b9f54c0 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -423,15 +423,15 @@ static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp,
 	if (sdkp->device->type != TYPE_ZBC) {
 		/* Host-aware */
 		sdkp->urswrz = 1;
-		sdkp->zones_optimal_open = get_unaligned_be64(&buf[8]);
-		sdkp->zones_optimal_nonseq = get_unaligned_be64(&buf[12]);
+		sdkp->zones_optimal_open = get_unaligned_be32(&buf[8]);
+		sdkp->zones_optimal_nonseq = get_unaligned_be32(&buf[12]);
 		sdkp->zones_max_open = 0;
 	} else {
 		/* Host-managed */
 		sdkp->urswrz = buf[4] & 1;
 		sdkp->zones_optimal_open = 0;
 		sdkp->zones_optimal_nonseq = 0;
-		sdkp->zones_max_open = get_unaligned_be64(&buf[16]);
+		sdkp->zones_max_open = get_unaligned_be32(&buf[16]);
 	}
 
 	return 0;
-- 
2.13.6

Re: [PATCH 0/5] ZBC support clenaup and fixes

[Martin K. Petersen]

Damien,

> First part of the "scsi-mq support for ZBC disks" series that is only
> scsi specific. These patches are just cleanups with only one bug fix
> (last pacth) and do not functionally change anything.
>
> The remaining rework of the zone locking including scsi-mq support is
> still ongoing and will be sent later.

Applied to 4.15/scsi-queue. Thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering