added : raid0_hot_add and raid0_hot_remove.fix alignment of device size to chunk size.
raid0.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
Signed-off-by: razb <raziebe@xxxxxxxxx>
---
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 1e01c61..984d603 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -619,6 +619,69 @@ static void raid0_status(struct seq_file *seq, mddev_t *mddev)
return;
}
+
+static int raid0_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
+{
+ char b[BDEVNAME_SIZE];
+ sector_t sectors;
+
+ if (rdev->sectors < mddev->chunk_sectors) {
+ printk(KERN_INFO "raid0: device smaller than "
+ "chunk size %llusectors < %llusectors\n",
+ (unsigned long long)rdev->sectors,
+ ((unsigned long long)mddev->chunk_sectors));
+ return -1;
+ }
+ if (queue_max_hw_sectors(rdev->bdev->bd_disk->queue) <
+ queue_max_hw_sectors(mddev->queue)) {
+ printk(KERN_INFO "raid0: device trasnfer"
+ " size %usectors is smaller than other"
+ "raid's components %usectors, rejecting ",
+ queue_max_hw_sectors(rdev->bdev->bd_disk->queue),
+ queue_max_hw_sectors(mddev->queue));
+ /*
+ * todo. accept the device. and only generate an error
+ */
+ return -1;
+ }
+ /*
+ * never allow adding new disks while reshape takes place
+ */
+ if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
+ printk(KERN_ERR "raid0: %s is in reshape\n",
+ mdname(mddev));
+ return -EBUSY;
+ }
+ sectors = rdev->sectors;
+ sector_div(sectors, mddev->chunk_sectors);
+ sectors = sectors * mddev->chunk_sectors;
+ rdev->sectors = sectors;
+ printk(KERN_INFO "raid0: hot add:reduce device "
+ " %s size: %lld --> %lld\n",
+ bdevname(rdev->bdev, b),
+ (unsigned long long)rdev->sectors,
+ (unsigned long long)sectors);
+ return 0;
+}
+
+/*
+ * we allow removal of a disk only if it is a spare.
+*/
+static int raid0_remove_disk(mddev_t *mddev, int number)
+{
+ raid0_conf_t *conf = mddev->private;
+ mdk_rdev_t *rdev = conf->devlist[number];
+ if (!rdev) {
+ printk(KERN_ERR "%s: error try to"
+ " remove disk number %d\n",
+ mdname(mddev), number);
+ return -1;
+ }
+ if (rdev->raid_disk != -1)
+ return -1;
+ return 0;
+}
+
static struct mdk_personality raid0_personality=
{
.name = "raid0",
@@ -629,6 +692,8 @@ static struct mdk_personality raid0_personality=
.stop = raid0_stop,
.status = raid0_status,
.size = raid0_size,
+ .hot_add_disk = raid0_add_disk,
+ .hot_remove_disk = raid0_remove_disk,
};
static int __init raid0_init (void)
--
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