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scsi: sd: sd_zbc: Introduce struct zoned_disk_info

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Deriving the meaning of the nr_zones, rev_nr_zones, zone_blocks and
rev_zone_blocks member variables requires careful analysis of the source
code. Make the meaning of these member variables easier to understand by
introducing struct zoned_disk_info.

Link: https://lore.kernel.org/r/20220421183023.3462291-5-bvanassche@acm.org
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2022-04-21 11:30:18 -07:00 committed by Martin K. Petersen
parent 43af5da09e
commit 628617be89
2 changed files with 41 additions and 30 deletions
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22
drivers/scsi/sd.h
View file

@ -67,6 +67,20 @@ enum {
SD_ZERO_WS10_UNMAP, /* Use WRITE SAME(10) with UNMAP */
};
/**
* struct zoned_disk_info - Specific properties of a ZBC SCSI device.
* @nr_zones: number of zones.
* @zone_blocks: number of logical blocks per zone.
*
* This data structure holds the ZBC SCSI device properties that are retrieved
* twice: a first time before the gendisk capacity is known and a second time
* after the gendisk capacity is known.
*/
struct zoned_disk_info {
u32 nr_zones;
u32 zone_blocks;
};
struct scsi_disk {
struct scsi_device *device;
@ -78,10 +92,10 @@ struct scsi_disk {
struct gendisk *disk;
struct opal_dev *opal_dev;
#ifdef CONFIG_BLK_DEV_ZONED
u32 nr_zones;
u32 rev_nr_zones;
u32 zone_blocks;
u32 rev_zone_blocks;
/* Updated during revalidation before the gendisk capacity is known. */
struct zoned_disk_info early_zone_info;
/* Updated during revalidation after the gendisk capacity is known. */
struct zoned_disk_info zone_info;
u32 zones_optimal_open;
u32 zones_optimal_nonseq;
u32 zones_max_open;

49
drivers/scsi/sd_zbc.c
View file

@ -181,7 +181,7 @@ static void *sd_zbc_alloc_report_buffer(struct scsi_disk *sdkp,
* sure that the allocated buffer can always be mapped by limiting the
* number of pages allocated to the HBA max segments limit.
*/
nr_zones = min(nr_zones, sdkp->nr_zones);
nr_zones = min(nr_zones, sdkp->zone_info.nr_zones);
bufsize = roundup((nr_zones + 1) * 64, SECTOR_SIZE);
bufsize = min_t(size_t, bufsize,
queue_max_hw_sectors(q) << SECTOR_SHIFT);
@ -206,7 +206,7 @@ static void *sd_zbc_alloc_report_buffer(struct scsi_disk *sdkp,
*/
static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
{
return logical_to_sectors(sdkp->device, sdkp->zone_blocks);
return logical_to_sectors(sdkp->device, sdkp->zone_info.zone_blocks);
}
/**
@ -262,7 +262,7 @@ int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
zone_idx++;
}
lba += sdkp->zone_blocks * i;
lba += sdkp->zone_info.zone_blocks * i;
}
ret = zone_idx;
@ -320,14 +320,14 @@ static void sd_zbc_update_wp_offset_workfn(struct work_struct *work)
sdkp = container_of(work, struct scsi_disk, zone_wp_offset_work);
spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
for (zno = 0; zno < sdkp->nr_zones; zno++) {
for (zno = 0; zno < sdkp->zone_info.nr_zones; zno++) {
if (sdkp->zones_wp_offset[zno] != SD_ZBC_UPDATING_WP_OFST)
continue;
spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
ret = sd_zbc_do_report_zones(sdkp, sdkp->zone_wp_update_buf,
SD_BUF_SIZE,
zno * sdkp->zone_blocks, true);
zno * sdkp->zone_info.zone_blocks, true);
spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
if (!ret)
sd_zbc_parse_report(sdkp, sdkp->zone_wp_update_buf + 64,
@ -394,7 +394,7 @@ blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
break;
default:
wp_offset = sectors_to_logical(sdkp->device, wp_offset);
if (wp_offset + nr_blocks > sdkp->zone_blocks) {
if (wp_offset + nr_blocks > sdkp->zone_info.zone_blocks) {
ret = BLK_STS_IOERR;
break;
}
@ -523,7 +523,7 @@ static unsigned int sd_zbc_zone_wp_update(struct scsi_cmnd *cmd,
break;
case REQ_OP_ZONE_RESET_ALL:
memset(sdkp->zones_wp_offset, 0,
sdkp->nr_zones * sizeof(unsigned int));
sdkp->zone_info.nr_zones * sizeof(unsigned int));
break;
default:
break;
@ -680,16 +680,16 @@ static void sd_zbc_print_zones(struct scsi_disk *sdkp)
if (!sd_is_zoned(sdkp) || !sdkp->capacity)
return;
if (sdkp->capacity & (sdkp->zone_blocks - 1))
if (sdkp->capacity & (sdkp->zone_info.zone_blocks - 1))
sd_printk(KERN_NOTICE, sdkp,
"%u zones of %u logical blocks + 1 runt zone\n",
sdkp->nr_zones - 1,
sdkp->zone_blocks);
sdkp->zone_info.nr_zones - 1,
sdkp->zone_info.zone_blocks);
else
sd_printk(KERN_NOTICE, sdkp,
"%u zones of %u logical blocks\n",
sdkp->nr_zones,
sdkp->zone_blocks);
sdkp->zone_info.nr_zones,
sdkp->zone_info.zone_blocks);
}
static int sd_zbc_init_disk(struct scsi_disk *sdkp)
@ -716,10 +716,8 @@ static void sd_zbc_clear_zone_info(struct scsi_disk *sdkp)
kfree(sdkp->zone_wp_update_buf);
sdkp->zone_wp_update_buf = NULL;
sdkp->nr_zones = 0;
sdkp->rev_nr_zones = 0;
sdkp->zone_blocks = 0;
sdkp->rev_zone_blocks = 0;
sdkp->early_zone_info = (struct zoned_disk_info){ };
sdkp->zone_info = (struct zoned_disk_info){ };
mutex_unlock(&sdkp->rev_mutex);
}
@ -746,8 +744,8 @@ int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
{
struct gendisk *disk = sdkp->disk;
struct request_queue *q = disk->queue;
u32 zone_blocks = sdkp->rev_zone_blocks;
unsigned int nr_zones = sdkp->rev_nr_zones;
u32 zone_blocks = sdkp->early_zone_info.zone_blocks;
unsigned int nr_zones = sdkp->early_zone_info.nr_zones;
u32 max_append;
int ret = 0;
unsigned int flags;
@ -778,14 +776,14 @@ int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
*/
mutex_lock(&sdkp->rev_mutex);
if (sdkp->zone_blocks == zone_blocks &&
sdkp->nr_zones == nr_zones &&
if (sdkp->zone_info.zone_blocks == zone_blocks &&
sdkp->zone_info.nr_zones == nr_zones &&
disk->queue->nr_zones == nr_zones)
goto unlock;
flags = memalloc_noio_save();
sdkp->zone_blocks = zone_blocks;
sdkp->nr_zones = nr_zones;
sdkp->zone_info.zone_blocks = zone_blocks;
sdkp->zone_info.nr_zones = nr_zones;
sdkp->rev_wp_offset = kvcalloc(nr_zones, sizeof(u32), GFP_KERNEL);
if (!sdkp->rev_wp_offset) {
ret = -ENOMEM;
@ -800,8 +798,7 @@ int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
sdkp->rev_wp_offset = NULL;
if (ret) {
sdkp->zone_blocks = 0;
sdkp->nr_zones = 0;
sdkp->zone_info = (struct zoned_disk_info){ };
sdkp->capacity = 0;
goto unlock;
}
@ -887,8 +884,8 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE])
if (blk_queue_zoned_model(q) == BLK_ZONED_HM)
blk_queue_zone_write_granularity(q, sdkp->physical_block_size);
sdkp->rev_nr_zones = nr_zones;
sdkp->rev_zone_blocks = zone_blocks;
sdkp->early_zone_info.nr_zones = nr_zones;
sdkp->early_zone_info.zone_blocks = zone_blocks;
return 0;