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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>
This commit is contained in:
Martin K. Petersen 2009-03-31 14:27:02 +11:00 committed by NeilBrown
parent 355a43e641
commit 3f9d99c12a
1 changed files with 39 additions and 0 deletions
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39
drivers/md/md.c
View File

@ -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: