Gitweb: http://git.kernel.org/linus/3f9d99c12a533809342b475c95452e82761bcc1c
Commit: 3f9d99c12a533809342b475c95452e82761bcc1c
Parent: 355a43e641b948a7b755cb4c2466ec548d5b495f
Author: Martin K. Petersen <martin.petersen@oracle.com>
AuthorDate: Tue Mar 31 14:27:02 2009 +1100
Committer: NeilBrown <neilb@suse.de>
CommitDate: Tue Mar 31 14:27:02 2009 +1100
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>
---
drivers/md/md.c | 39 +++++++++++++++++++++++++++++++++++++++
1 files changed, 39 insertions(+), 0 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index a99c50e..f30b461 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:
--
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