| Message ID | 1475052339-10202-2-git-send-email-damien.lemoal@hgst.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Sep 28, 2016 at 3:45 AM, Damien Le Moal <damien.lemoal@hgst.com> wrote: > Add the zoned queue limit to indicate the zoning model of a block device. > Defined values are 0 (BLK_ZONED_NONE) for regular block devices, > 1 (BLK_ZONED_HA) for host-aware zone block devices and 2 (BLK_ZONED_HM) > for host-managed zone block devices. The standards defined drive managed > model is not defined here since these block devices do not provide any > command for accessing zone information. Drive managed model devices will > be reported as BLK_ZONED_NONE. > > The helper functions blk_queue_zoned_model and bdev_zoned_model return > the zoned limit and the functions blk_queue_is_zoned and bdev_is_zoned > return a boolean for callers to test if a block device is zoned. > > The zoned attribute is also exported as a string to applications via > sysfs. BLK_ZONED_NONE shows as "none", BLK_ZONED_HA as "host-aware" and > BLK_ZONED_HM as "host-managed". > > Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com> > --- > Documentation/ABI/testing/sysfs-block | 16 ++++++++++++ > block/blk-settings.c | 1 + > block/blk-sysfs.c | 18 ++++++++++++++ > include/linux/blkdev.h | 47 +++++++++++++++++++++++++++++++++++ > 4 files changed, 82 insertions(+) > > diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block > index 71d184d..75a5055 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 f679ae1..b1d5b7f 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 9cc8d7c..ff9cd9c 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 c47c358..f19e16b 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; > -- > 2.7.4 Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com> Tested-by: Shaun Tancheff <shaun.tancheff@seagate.com> > -- > To unsubscribe from this list: send the line "unsubscribe linux-block" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at https://urldefense.proofpoint.com/v2/url?u=http-3A__vger.kernel.org_majordomo-2Dinfo.html&d=DQIBAg&c=IGDlg0lD0b-nebmJJ0Kp8A&r=Wg5NqlNlVTT7Ugl8V50qIHLe856QW0qfG3WVYGOrWzA&m=OrJGmhxktFJiu0t9zZDWOTM1h0hle-YsGIdgS8egsv4&s=iBLL4ue7jd5w6PMQqeLF8l-1CVvqmRuI_aQgJJV6Cp0&e=
>>>>> "Damien" == Damien Le Moal <damien.lemoal@hgst.com> writes: Damien> Add the zoned queue limit to indicate the zoning model of a Damien> block device. Defined values are 0 (BLK_ZONED_NONE) for regular Damien> block devices, 1 (BLK_ZONED_HA) for host-aware zone block Damien> devices and 2 (BLK_ZONED_HM) for host-managed zone block Damien> devices. The standards defined drive managed model is not Damien> defined here since these block devices do not provide any Damien> command for accessing zone information. Drive managed model Damien> devices will be reported as BLK_ZONED_NONE. Damien> The helper functions blk_queue_zoned_model and bdev_zoned_model Damien> return the zoned limit and the functions blk_queue_is_zoned and Damien> bdev_is_zoned return a boolean for callers to test if a block Damien> device is zoned. Damien> The zoned attribute is also exported as a string to applications Damien> via sysfs. BLK_ZONED_NONE shows as "none", BLK_ZONED_HA as Damien> "host-aware" and BLK_ZONED_HM as "host-managed". Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block index 71d184d..75a5055 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 f679ae1..b1d5b7f 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 9cc8d7c..ff9cd9c 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 c47c358..f19e16b 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;
Add the zoned queue limit to indicate the zoning model of a block device. Defined values are 0 (BLK_ZONED_NONE) for regular block devices, 1 (BLK_ZONED_HA) for host-aware zone block devices and 2 (BLK_ZONED_HM) for host-managed zone block devices. The standards defined drive managed model is not defined here since these block devices do not provide any command for accessing zone information. Drive managed model devices will be reported as BLK_ZONED_NONE. The helper functions blk_queue_zoned_model and bdev_zoned_model return the zoned limit and the functions blk_queue_is_zoned and bdev_is_zoned return a boolean for callers to test if a block device is zoned. The zoned attribute is also exported as a string to applications via sysfs. BLK_ZONED_NONE shows as "none", BLK_ZONED_HA as "host-aware" and BLK_ZONED_HM as "host-managed". Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com> --- Documentation/ABI/testing/sysfs-block | 16 ++++++++++++ block/blk-settings.c | 1 + block/blk-sysfs.c | 18 ++++++++++++++ include/linux/blkdev.h | 47 +++++++++++++++++++++++++++++++++++ 4 files changed, 82 insertions(+)