Commit 27ba3e8f authored by Damien Le Moal's avatar Damien Le Moal Committed by Martin K. Petersen

scsi: sd: sd_zbc: Fix handling of host-aware ZBC disks

When CONFIG_BLK_DEV_ZONED is disabled, allow using host-aware ZBC disks as
regular disks. In this case, ensure that command completion is correctly
executed by changing sd_zbc_complete() to return good_bytes instead of 0
and causing a hang during device probe (endless retries).

When CONFIG_BLK_DEV_ZONED is enabled and a host-aware disk is detected to
have partitions, it will be used as a regular disk. In this case, make sure
to not do anything in sd_zbc_revalidate_zones() as that triggers warnings.

Since all these different cases result in subtle settings of the disk queue
zoned model, introduce the block layer helper function
blk_queue_set_zoned() to generically implement setting up the effective
zoned model according to the disk type, the presence of partitions on the
disk and CONFIG_BLK_DEV_ZONED configuration.

Link: https://lore.kernel.org/r/20200915073347.832424-2-damien.lemoal@wdc.com
Fixes: b7205307 ("block: allow partitions on host aware zone devices")
Cc: <stable@vger.kernel.org>
Reported-by: default avatarBorislav Petkov <bp@alien8.de>
Suggested-by: default avatarChristoph Hellwig <hch@infradead.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 7f04839e
......@@ -801,6 +801,52 @@ bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
}
EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging);
/**
* blk_queue_set_zoned - configure a disk queue zoned model.
* @disk: the gendisk of the queue to configure
* @model: the zoned model to set
*
* Set the zoned model of the request queue of @disk according to @model.
* When @model is BLK_ZONED_HM (host managed), this should be called only
* if zoned block device support is enabled (CONFIG_BLK_DEV_ZONED option).
* If @model specifies BLK_ZONED_HA (host aware), the effective model used
* depends on CONFIG_BLK_DEV_ZONED settings and on the existence of partitions
* on the disk.
*/
void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model)
{
switch (model) {
case BLK_ZONED_HM:
/*
* Host managed devices are supported only if
* CONFIG_BLK_DEV_ZONED is enabled.
*/
WARN_ON_ONCE(!IS_ENABLED(CONFIG_BLK_DEV_ZONED));
break;
case BLK_ZONED_HA:
/*
* Host aware devices can be treated either as regular block
* devices (similar to drive managed devices) or as zoned block
* devices to take advantage of the zone command set, similarly
* to host managed devices. We try the latter if there are no
* partitions and zoned block device support is enabled, else
* we do nothing special as far as the block layer is concerned.
*/
if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) ||
disk_has_partitions(disk))
model = BLK_ZONED_NONE;
break;
case BLK_ZONED_NONE:
default:
if (WARN_ON_ONCE(model != BLK_ZONED_NONE))
model = BLK_ZONED_NONE;
break;
}
disk->queue->limits.zoned = model;
}
EXPORT_SYMBOL_GPL(blk_queue_set_zoned);
static int __init blk_settings_init(void)
{
blk_max_low_pfn = max_low_pfn - 1;
......
......@@ -2964,26 +2964,32 @@ static void sd_read_block_characteristics(struct scsi_disk *sdkp)
if (sdkp->device->type == TYPE_ZBC) {
/* Host-managed */
q->limits.zoned = BLK_ZONED_HM;
blk_queue_set_zoned(sdkp->disk, BLK_ZONED_HM);
} else {
sdkp->zoned = (buffer[8] >> 4) & 3;
if (sdkp->zoned == 1 && !disk_has_partitions(sdkp->disk)) {
if (sdkp->zoned == 1) {
/* Host-aware */
q->limits.zoned = BLK_ZONED_HA;
blk_queue_set_zoned(sdkp->disk, BLK_ZONED_HA);
} else {
/*
* Treat drive-managed devices and host-aware devices
* with partitions as regular block devices.
*/
q->limits.zoned = BLK_ZONED_NONE;
if (sdkp->zoned == 2 && sdkp->first_scan)
sd_printk(KERN_NOTICE, sdkp,
"Drive-managed SMR disk\n");
/* Regular disk or drive managed disk */
blk_queue_set_zoned(sdkp->disk, BLK_ZONED_NONE);
}
}
if (blk_queue_is_zoned(q) && sdkp->first_scan)
if (!sdkp->first_scan)
goto out;
if (blk_queue_is_zoned(q)) {
sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
} else {
if (sdkp->zoned == 1)
sd_printk(KERN_NOTICE, sdkp,
"Host-aware SMR disk used as regular disk\n");
else if (sdkp->zoned == 2)
sd_printk(KERN_NOTICE, sdkp,
"Drive-managed SMR disk\n");
}
out:
kfree(buffer);
......
......@@ -259,7 +259,7 @@ static inline blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
static inline unsigned int sd_zbc_complete(struct scsi_cmnd *cmd,
unsigned int good_bytes, struct scsi_sense_hdr *sshdr)
{
return 0;
return good_bytes;
}
static inline blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd,
......
......@@ -667,7 +667,11 @@ int sd_zbc_revalidate_zones(struct scsi_disk *sdkp)
u32 max_append;
int ret = 0;
if (!sd_is_zoned(sdkp))
/*
* There is nothing to do for regular disks, including host-aware disks
* that have partitions.
*/
if (!blk_queue_is_zoned(q))
return 0;
/*
......
......@@ -352,6 +352,8 @@ struct queue_limits {
typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
void *data);
void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model);
#ifdef CONFIG_BLK_DEV_ZONED
#define BLK_ALL_ZONES ((unsigned int)-1)
......
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