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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2014-09-26 19:20:03 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-09-27 09:14:51 -0600 |
| commit | 3aec2f41a8baeb70aa77556a4e4dcec7d9d70b4d (patch) | |
| tree | 2725a81cae556798bd3f363c4e8e5595c1ce1aaf | |
| parent | 8288f496eb1b1905c425e92eaf1abbb29119217b (diff) | |
| download | op-kernel-dev-3aec2f41a8baeb70aa77556a4e4dcec7d9d70b4d.zip op-kernel-dev-3aec2f41a8baeb70aa77556a4e4dcec7d9d70b4d.tar.gz | |
block: Add a disk flag to block integrity profile
So far we have relied on the app tag size to determine whether a disk
has been formatted with T10 protection information or not. However, not
all target devices provide application tag storage.
Add a flag to the block integrity profile that indicates whether the
disk has been formatted with protection information.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@dev.mellanox.co.il>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block | 8 | ||||
| -rw-r--r-- | block/blk-integrity.c | 12 | ||||
| -rw-r--r-- | drivers/scsi/sd_dif.c | 8 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 1 |
4 files changed, 28 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block index 279da08..8df0039 100644 --- a/Documentation/ABI/testing/sysfs-block +++ b/Documentation/ABI/testing/sysfs-block @@ -53,6 +53,14 @@ Description: 512 bytes of data. +What: /sys/block/<disk>/integrity/device_is_integrity_capable +Date: July 2014 +Contact: Martin K. Petersen <martin.petersen@oracle.com> +Description: + Indicates whether a storage device is capable of storing + integrity metadata. Set if the device is T10 PI-capable. + + What: /sys/block/<disk>/integrity/write_generate Date: June 2008 Contact: Martin K. Petersen <martin.petersen@oracle.com> diff --git a/block/blk-integrity.c b/block/blk-integrity.c index a7436cc..1c6ba44 100644 --- a/block/blk-integrity.c +++ b/block/blk-integrity.c @@ -307,6 +307,12 @@ static ssize_t integrity_generate_show(struct blk_integrity *bi, char *page) return sprintf(page, "%d\n", (bi->flags & BLK_INTEGRITY_GENERATE) != 0); } +static ssize_t integrity_device_show(struct blk_integrity *bi, char *page) +{ + return sprintf(page, "%u\n", + (bi->flags & BLK_INTEGRITY_DEVICE_CAPABLE) != 0); +} + static struct integrity_sysfs_entry integrity_format_entry = { .attr = { .name = "format", .mode = S_IRUGO }, .show = integrity_format_show, @@ -329,11 +335,17 @@ static struct integrity_sysfs_entry integrity_generate_entry = { .store = integrity_generate_store, }; +static struct integrity_sysfs_entry integrity_device_entry = { + .attr = { .name = "device_is_integrity_capable", .mode = S_IRUGO }, + .show = integrity_device_show, +}; + static struct attribute *integrity_attrs[] = { &integrity_format_entry.attr, &integrity_tag_size_entry.attr, &integrity_verify_entry.attr, &integrity_generate_entry.attr, + &integrity_device_entry.attr, NULL, }; diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c index 801c418..1e971c6 100644 --- a/drivers/scsi/sd_dif.c +++ b/drivers/scsi/sd_dif.c @@ -270,7 +270,13 @@ void sd_dif_config_host(struct scsi_disk *sdkp) "Enabling DIX %s protection\n", disk->integrity->name); /* Signal to block layer that we support sector tagging */ - if (dif && type && sdkp->ATO) { + if (dif && type) { + + disk->integrity->flags |= BLK_INTEGRITY_DEVICE_CAPABLE; + + if (!sdkp) + return; + if (type == SD_DIF_TYPE3_PROTECTION) disk->integrity->tag_size = sizeof(u16) + sizeof(u32); else diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index cf92eb0..4600fc6 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1461,6 +1461,7 @@ static inline uint64_t rq_io_start_time_ns(struct request *req) enum blk_integrity_flags { BLK_INTEGRITY_VERIFY = 1 << 0, BLK_INTEGRITY_GENERATE = 1 << 1, + BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, }; struct blk_integrity_iter { |
