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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>
This commit is contained in:
Martin K. Petersen 2014-09-26 19:20:03 -04:00 committed by Jens Axboe
parent 8288f496eb
commit 3aec2f41a8
4 changed files with 28 additions and 1 deletions
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8
Documentation/ABI/testing/sysfs-block
View File

@ -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>

12
block/blk-integrity.c
View File

@ -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,
};

8
drivers/scsi/sd_dif.c
View File

@ -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

1
include/linux/blkdev.h
View File

@ -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 {