diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block | 16 | ||||
| -rw-r--r-- | block/blk-settings.c | 1 | ||||
| -rw-r--r-- | block/blk-sysfs.c | 18 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 47 |
4 files changed, 82 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block index 71d184dbb70d2..75a5055a722b7 100644 --- a/Documentation/ABI/testing/sysfs-block +++ b/Documentation/ABI/testing/sysfs-block @@ -235,3 +235,19 @@ Description: write_same_max_bytes is 0, write same is not supported by the device. +What: /sys/block/<disk>/queue/zoned +Date: September 2016 +Contact: Damien Le Moal <damien.lemoal@hgst.com> +Description: + zoned indicates if the device is a zoned block device + and the zone model of the device if it is indeed zoned. + The possible values indicated by zoned are "none" for + regular block devices and "host-aware" or "host-managed" + for zoned block devices. The characteristics of + host-aware and host-managed zoned block devices are + described in the ZBC (Zoned Block Commands) and ZAC + (Zoned Device ATA Command Set) standards. These standards + also define the "drive-managed" zone model. However, + since drive-managed zoned block devices do not support + zone commands, they will be treated as regular block + devices and zoned will report "none". diff --git a/block/blk-settings.c b/block/blk-settings.c index f679ae1228435..b1d5b7fa4d076 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -107,6 +107,7 @@ void blk_set_default_limits(struct queue_limits *lim) lim->io_opt = 0; lim->misaligned = 0; lim->cluster = 1; + lim->zoned = BLK_ZONED_NONE; } EXPORT_SYMBOL(blk_set_default_limits); diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 9cc8d7c5439a9..ff9cd9cd35a35 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -257,6 +257,18 @@ QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); #undef QUEUE_SYSFS_BIT_FNS +static ssize_t queue_zoned_show(struct request_queue *q, char *page) +{ + switch (blk_queue_zoned_model(q)) { + case BLK_ZONED_HA: + return sprintf(page, "host-aware\n"); + case BLK_ZONED_HM: + return sprintf(page, "host-managed\n"); + default: + return sprintf(page, "none\n"); + } +} + static ssize_t queue_nomerges_show(struct request_queue *q, char *page) { return queue_var_show((blk_queue_nomerges(q) << 1) | @@ -485,6 +497,11 @@ static struct queue_sysfs_entry queue_nonrot_entry = { .store = queue_store_nonrot, }; +static struct queue_sysfs_entry queue_zoned_entry = { + .attr = {.name = "zoned", .mode = S_IRUGO }, + .show = queue_zoned_show, +}; + static struct queue_sysfs_entry queue_nomerges_entry = { .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR }, .show = queue_nomerges_show, @@ -546,6 +563,7 @@ static struct attribute *default_attrs[] = { &queue_discard_zeroes_data_entry.attr, &queue_write_same_max_entry.attr, &queue_nonrot_entry.attr, + &queue_zoned_entry.attr, &queue_nomerges_entry.attr, &queue_rq_affinity_entry.attr, &queue_iostats_entry.attr, diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index c47c358ba0529..f19e16bb43d1c 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -261,6 +261,15 @@ struct blk_queue_tag { #define BLK_SCSI_MAX_CMDS (256) #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) +/* + * Zoned block device models (zoned limit). + */ +enum blk_zoned_model { + BLK_ZONED_NONE, /* Regular block device */ + BLK_ZONED_HA, /* Host-aware zoned block device */ + BLK_ZONED_HM, /* Host-managed zoned block device */ +}; + struct queue_limits { unsigned long bounce_pfn; unsigned long seg_boundary_mask; @@ -290,6 +299,7 @@ struct queue_limits { unsigned char cluster; unsigned char discard_zeroes_data; unsigned char raid_partial_stripes_expensive; + enum blk_zoned_model zoned; }; struct request_queue { @@ -627,6 +637,23 @@ static inline unsigned int blk_queue_cluster(struct request_queue *q) return q->limits.cluster; } +static inline enum blk_zoned_model +blk_queue_zoned_model(struct request_queue *q) +{ + return q->limits.zoned; +} + +static inline bool blk_queue_is_zoned(struct request_queue *q) +{ + switch (blk_queue_zoned_model(q)) { + case BLK_ZONED_HA: + case BLK_ZONED_HM: + return true; + default: + return false; + } +} + /* * We regard a request as sync, if either a read or a sync write */ @@ -1354,6 +1381,26 @@ static inline unsigned int bdev_write_same(struct block_device *bdev) return 0; } +static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) +{ + struct request_queue *q = bdev_get_queue(bdev); + + if (q) + return blk_queue_zoned_model(q); + + return BLK_ZONED_NONE; +} + +static inline bool bdev_is_zoned(struct block_device *bdev) +{ + struct request_queue *q = bdev_get_queue(bdev); + + if (q) + return blk_queue_is_zoned(q); + + return false; +} + static inline int queue_dma_alignment(struct request_queue *q) { return q ? q->dma_alignment : 511; |