Introduce sd_zbc.h for zbc related declarations (avoid cluttering sd.h).
Fix comments style in sd_zbc.c (do not use documentation format) and
add/fix comments to enhance explanations. Also remove a useless blank
line in sd_zbc_read_zones().
Rearrange sd_zbc_setup() to include use_16_for_rw and use_10_for_rw
assignment and simplify nr_zones calculation.
Finally, use the min() macro sd_zbc_check_zone_size() to get a report
zone reply size instead of the open coded version.
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx>
---
drivers/scsi/sd.c | 1 +
drivers/scsi/sd.h | 53 --------------------------------
drivers/scsi/sd_zbc.c | 85 +++++++++++++++++++++++++--------------------------
drivers/scsi/sd_zbc.h | 75 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 117 insertions(+), 97 deletions(-)
create mode 100644 drivers/scsi/sd_zbc.h
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 962cef13d406..6711d49fde79 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -68,6 +68,7 @@
#include <scsi/scsicam.h>
#include "sd.h"
+#include "sd_zbc.h"
#include "scsi_priv.h"
#include "scsi_logging.h"
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 99c4dde9b6bf..5940390d30f3 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -272,57 +272,4 @@ static inline void sd_dif_complete(struct scsi_cmnd *cmd, unsigned int a)
#endif /* CONFIG_BLK_DEV_INTEGRITY */
-static inline int sd_is_zoned(struct scsi_disk *sdkp)
-{
- return sdkp->zoned == 1 || sdkp->device->type == TYPE_ZBC;
-}
-
-#ifdef CONFIG_BLK_DEV_ZONED
-
-extern int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buffer);
-extern void sd_zbc_remove(struct scsi_disk *sdkp);
-extern void sd_zbc_print_zones(struct scsi_disk *sdkp);
-extern int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd);
-extern void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd);
-extern int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd);
-extern int 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);
-
-#else /* CONFIG_BLK_DEV_ZONED */
-
-static inline int sd_zbc_read_zones(struct scsi_disk *sdkp,
- unsigned char *buf)
-{
- return 0;
-}
-
-static inline void sd_zbc_remove(struct scsi_disk *sdkp) {}
-
-static inline void sd_zbc_print_zones(struct scsi_disk *sdkp) {}
-
-static inline int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
-{
- /* Let the drive fail requests */
- return BLKPREP_OK;
-}
-
-static inline void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd) {}
-
-static inline int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
-{
- return BLKPREP_INVALID;
-}
-
-static inline int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
-{
- return BLKPREP_INVALID;
-}
-
-static inline void sd_zbc_complete(struct scsi_cmnd *cmd,
- unsigned int good_bytes,
- struct scsi_sense_hdr *sshdr) {}
-
-#endif /* CONFIG_BLK_DEV_ZONED */
-
#endif /* _SCSI_DISK_H */
diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index d445a57f99bd..810377007665 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -26,22 +26,12 @@
#include <asm/unaligned.h>
-#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"
-
-/**
+#include "sd_zbc.h"
+
+/*
* Convert a zone descriptor to a zone struct.
*/
-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;
@@ -63,8 +53,9 @@ static void sd_zbc_parse_report(struct scsi_disk *sdkp,
zone->wp = zone->start + zone->len;
}
-/**
+/*
* Issue a REPORT ZONES scsi command.
+ * For internal use.
*/
static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
unsigned int buflen, sector_t lba)
@@ -105,6 +96,9 @@ static int sd_zbc_report_zones(struct scsi_disk *sdkp, unsigned char *buf,
return 0;
}
+/*
+ * Prepare a REPORT ZONES scsi command for a REQ_OP_ZONE_REPORT request.
+ */
int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
{
struct request *rq = cmd->request;
@@ -147,6 +141,10 @@ int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
return BLKPREP_OK;
}
+/*
+ * Process a REPORT ZONES scsi command reply, converting all reported
+ * zone descriptors to blk_zone structures.
+ */
static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd,
unsigned int good_bytes)
{
@@ -202,17 +200,9 @@ static void sd_zbc_report_zones_complete(struct scsi_cmnd *scmd,
local_irq_restore(flags);
}
-static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
-{
- return logical_to_sectors(sdkp->device, sdkp->zone_blocks);
-}
-
-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;
-}
-
+/*
+ * Prepare a RESET WRITE POINTER scsi command for a REQ_OP_ZONE_RESET request.
+ */
int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
{
struct request *rq = cmd->request;
@@ -245,6 +235,11 @@ int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
return BLKPREP_OK;
}
+/*
+ * Write lock a sequential zone.
+ * Called from sd_init_cmd() for write requests
+ * (standard write, write same or write zeroes operations).
+ */
int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
{
struct request *rq = cmd->request;
@@ -282,6 +277,10 @@ int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
return BLKPREP_OK;
}
+/*
+ * Write unlock a sequential zone.
+ * Called from sd_uninit_cmd().
+ */
void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd)
{
struct request *rq = cmd->request;
@@ -341,7 +340,7 @@ void sd_zbc_complete(struct scsi_cmnd *cmd,
}
}
-/**
+/*
* Read zoned block device characteristics (VPD page B6).
*/
static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp,
@@ -371,7 +370,7 @@ static int sd_zbc_read_zoned_characteristics(struct scsi_disk *sdkp,
return 0;
}
-/**
+/*
* Check reported capacity.
*/
static int sd_zbc_check_capacity(struct scsi_disk *sdkp,
@@ -403,8 +402,12 @@ static int sd_zbc_check_capacity(struct scsi_disk *sdkp,
return 0;
}
-#define SD_ZBC_BUF_SIZE 131072
+#define SD_ZBC_BUF_SIZE 131072U
+/*
+ * Check that all zones of the device have the same size, with eventually
+ * the exception of the last zone which is allowed to have a smaller size.
+ */
static int sd_zbc_check_zone_size(struct scsi_disk *sdkp)
{
u64 zone_blocks;
@@ -447,10 +450,7 @@ 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) {
@@ -505,6 +505,7 @@ static int sd_zbc_check_zone_size(struct scsi_disk *sdkp)
}
sdkp->zone_blocks = zone_blocks;
+ sdkp->zone_shift = ilog2(zone_blocks);
return 0;
}
@@ -512,13 +513,15 @@ 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++;
+ 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),
@@ -531,8 +534,7 @@ 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;
@@ -543,7 +545,6 @@ 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)
@@ -580,10 +581,6 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp,
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:
diff --git a/drivers/scsi/sd_zbc.h b/drivers/scsi/sd_zbc.h
new file mode 100644
index 000000000000..c120672d56d6
--- /dev/null
+++ b/drivers/scsi/sd_zbc.h
@@ -0,0 +1,75 @@
+#ifndef _SCSI_DISK_ZBC_H
+#define _SCSI_DISK_ZBC_H
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include "sd.h"
+
+static inline int sd_is_zoned(struct scsi_disk *sdkp)
+{
+ return sdkp->zoned == 1 || sdkp->device->type == TYPE_ZBC;
+}
+
+#ifdef CONFIG_BLK_DEV_ZONED
+
+static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
+{
+ return logical_to_sectors(sdkp->device, sdkp->zone_blocks);
+}
+
+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;
+}
+
+extern int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buffer);
+extern void sd_zbc_remove(struct scsi_disk *sdkp);
+extern void sd_zbc_print_zones(struct scsi_disk *sdkp);
+
+extern int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd);
+extern void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd);
+
+extern int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd);
+extern int 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);
+
+#else /* CONFIG_BLK_DEV_ZONED */
+
+static inline int sd_zbc_read_zones(struct scsi_disk *sdkp,
+ unsigned char *buf)
+{
+ return 0;
+}
+
+static inline void sd_zbc_remove(struct scsi_disk *sdkp) {}
+
+static inline void sd_zbc_print_zones(struct scsi_disk *sdkp) {}
+
+static inline int sd_zbc_write_lock_zone(struct scsi_cmnd *cmd)
+{
+ /* Let the drive fail requests */
+ return BLKPREP_OK;
+}
+
+static inline void sd_zbc_write_unlock_zone(struct scsi_cmnd *cmd) {}
+
+static inline int sd_zbc_setup_report_cmnd(struct scsi_cmnd *cmd)
+{
+ return BLKPREP_INVALID;
+}
+
+static inline int sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd)
+{
+ return BLKPREP_INVALID;
+}
+
+static inline void sd_zbc_complete(struct scsi_cmnd *cmd,
+ unsigned int good_bytes,
+ struct scsi_sense_hdr *sshdr) {}
+
+#endif /* CONFIG_BLK_DEV_ZONED */
+
+#endif /* _SCSI_DISK_ZBC_H */
--
2.13.5
