Subject:[PATCH 009:013]: raid0:add hot add and hot remove
From: raz ben yehuda <hidden>
Date: 2009-06-16 21:57:51
Subsystem:
software raid (multiple disks) support, the rest · Maintainers:
Song Liu, Yu Kuai, Linus Torvalds
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 <redacted> ---
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)