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authorMartin K. Petersen <martin.petersen@oracle.com>2014-09-26 19:20:03 -0400
committerJens Axboe <axboe@fb.com>2014-09-27 09:14:51 -0600
commit3aec2f41a8baeb70aa77556a4e4dcec7d9d70b4d (patch)
tree2725a81cae556798bd3f363c4e8e5595c1ce1aaf
parent8288f496eb1b1905c425e92eaf1abbb29119217b (diff)
downloadop-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-block8
-rw-r--r--block/blk-integrity.c12
-rw-r--r--drivers/scsi/sd_dif.c8
-rw-r--r--include/linux/blkdev.h1
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 {
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