block: Export integrity data interval size in sysfs

The size of the data interval was not exported in the sysfs integrity
directory. Export it so that userland apps can tell whether the interval
is different from the device's logical block size.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index c7508654faff..7a96f57ed195 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -289,6 +289,14 @@ static ssize_t integrity_tag_size_show(struct blk_integrity *bi, char *page)
                 return sprintf(page, "0\n");
 }
 
+static ssize_t integrity_interval_show(struct blk_integrity *bi, char *page)
+{
+        if (bi != NULL)
+                return sprintf(page, "%u\n", 1 << bi->interval_exp);
+        else
+                return sprintf(page, "0\n");
+}
+
 static ssize_t integrity_verify_store(struct blk_integrity *bi,
                                       const char *page, size_t count)
 {
@@ -343,6 +351,11 @@ static struct integrity_sysfs_entry integrity_tag_size_entry = {
         .show = integrity_tag_size_show,
 };
 
+static struct integrity_sysfs_entry integrity_interval_entry = {
+        .attr = { .name = "protection_interval_bytes", .mode = S_IRUGO },
+        .show = integrity_interval_show,
+};
+
 static struct integrity_sysfs_entry integrity_verify_entry = {
         .attr = { .name = "read_verify", .mode = S_IRUGO | S_IWUSR },
         .show = integrity_verify_show,
@@ -363,6 +376,7 @@ static struct integrity_sysfs_entry integrity_device_entry = {
 static struct attribute *integrity_attrs[] = {
         &integrity_format_entry.attr,
         &integrity_tag_size_entry.attr,
+        &integrity_interval_entry.attr,
         &integrity_verify_entry.attr,
         &integrity_generate_entry.attr,
         &integrity_device_entry.attr,