MD data integrity support

md: Add support for data integrity to MD

If all subdevices support the same protection format the MD device is
flagged as integrity capable.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 39 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index a99c50e217c0..f30b4618c02c 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1438,6 +1438,38 @@ static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
 
 static LIST_HEAD(pending_raid_disks);
 
+static void md_integrity_check(mdk_rdev_t *rdev, mddev_t *mddev)
+{
+        struct mdk_personality *pers = mddev->pers;
+        struct gendisk *disk = mddev->gendisk;
+        struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
+        struct blk_integrity *bi_mddev = blk_get_integrity(disk);
+
+        /* Data integrity passthrough not supported on RAID 4, 5 and 6 */
+        if (pers && pers->level >= 4 && pers->level <= 6)
+                return;
+
+        /* If rdev is integrity capable, register profile for mddev */
+        if (!bi_mddev && bi_rdev) {
+                if (blk_integrity_register(disk, bi_rdev))
+                        printk(KERN_ERR "%s: %s Could not register integrity!\n",
+                               __func__, disk->disk_name);
+                else
+                        printk(KERN_NOTICE "Enabling data integrity on %s\n",
+                               disk->disk_name);
+                return;
+        }
+
+        /* Check that mddev and rdev have matching profiles */
+        if (blk_integrity_compare(disk, rdev->bdev->bd_disk) < 0) {
+                printk(KERN_ERR "%s: %s/%s integrity mismatch!\n", __func__,
+                       disk->disk_name, rdev->bdev->bd_disk->disk_name);
+                printk(KERN_NOTICE "Disabling data integrity on %s\n",
+                       disk->disk_name);
+                blk_integrity_unregister(disk);
+        }
+}
+
 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
 {
         char b[BDEVNAME_SIZE];
@@ -1508,6 +1540,8 @@ static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
 
         /* May as well allow recovery to be retried once */
         mddev->recovery_disabled = 0;
+
+        md_integrity_check(rdev, mddev);
         return 0;
 
  fail:
@@ -3794,6 +3828,10 @@ static int do_md_run(mddev_t * mddev)
         mddev->level = pers->level;
         strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
 
+        if (pers->level >= 4 && pers->level <= 6)
+                /* Cannot support integrity (yet) */
+                blk_integrity_unregister(mddev->gendisk);
+
         if (mddev->reshape_position != MaxSector &&
             pers->start_reshape == NULL) {
                 /* This personality cannot handle reshaping... */
@@ -4129,6 +4167,7 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
                 printk(KERN_INFO "md: %s switched to read-only mode.\n",
                         mdname(mddev));
         err = 0;
+        blk_integrity_unregister(disk);
         md_new_event(mddev);
         sysfs_notify_dirent(mddev->sysfs_state);
 out: