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>

1 files changed, 12 insertions, 0 deletions

diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index a7436ccc936b..1c6ba442cd91 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,
 };