When a raid1 array is reshaped (number of drives changed),
the list of devices is compacted, so that slots for missing
devices are filled with working devices from later slots.
This requires the "rd%d" symlinks in sysfs to be updated.
Signed-off-by: Neil Brown <[email protected]>
### Diffstat output
./drivers/md/raid1.c | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)
diff .prev/drivers/md/raid1.c ./drivers/md/raid1.c
--- .prev/drivers/md/raid1.c 2007-08-16 10:27:57.000000000 +1000
+++ ./drivers/md/raid1.c 2007-08-16 10:29:58.000000000 +1000
@@ -2154,11 +2154,25 @@ static int raid1_reshape(mddev_t *mddev)
oldpool = conf->r1bio_pool;
conf->r1bio_pool = newpool;
- for (d=d2=0; d < conf->raid_disks; d++)
- if (conf->mirrors[d].rdev) {
- conf->mirrors[d].rdev->raid_disk = d2;
- newmirrors[d2++].rdev = conf->mirrors[d].rdev;
+ for (d = d2 = 0; d < conf->raid_disks; d++) {
+ mdk_rdev_t *rdev = conf->mirrors[d].rdev;
+ if (rdev && rdev->raid_disk != d2) {
+ char nm[20];
+ sprintf(nm, "rd%d", rdev->raid_disk);
+ sysfs_remove_link(&mddev->kobj, nm);
+ rdev->raid_disk = d2;
+ sprintf(nm, "rd%d", rdev->raid_disk);
+ sysfs_remove_link(&mddev->kobj, nm);
+ if (sysfs_create_link(&mddev->kobj,
+ &rdev->kobj, nm))
+ printk(KERN_WARNING
+ "md/raid1: cannot register "
+ "%s for %s\n",
+ nm, mdname(mddev));
}
+ if (rdev)
+ newmirrors[d2++].rdev = rdev;
+ }
kfree(conf->mirrors);
conf->mirrors = newmirrors;
kfree(conf->poolinfo);
-
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