Until now Raid10->Raid0 takeover was possible only if all the mirrors where removed before md starts the takeover.
Now mdadm, when performing Raid10->raid0 takeover, will remove all unwanted mirrors from the array before actual md takeover is called.
Signed-off-by: Maciej Trela <maciej.trela@xxxxxxxxx>
Signed-off-by: Adam Kwolek <adam.kwolek@xxxxxxxxx>
---
Grow.c | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 106 insertions(+), 1 deletions(-)
diff --git a/Grow.c b/Grow.c
index e977ce2..347f07b 100644
--- a/Grow.c
+++ b/Grow.c
@@ -746,6 +746,92 @@ static void revert_container_raid_disks(struct supertype *st, int fd, char *cont
free_mdstat(ent);
}
+int remove_disks_on_raid10_to_raid0_takeover(struct supertype *st,
+ struct mdinfo *sra,
+ int layout)
+{
+ int max_disks;
+ int nr_of_copies, in_sync, copies;
+ struct mdinfo info;
+ struct mdinfo *sd_temp;
+ struct mdinfo *sd;
+ int d;
+
+ st->ss->getinfo_super(st, &info);
+ max_disks = info.array.raid_disks;
+
+ nr_of_copies = layout & 0xff;
+ in_sync = nr_of_copies;
+ copies = nr_of_copies;
+
+ /* sort list by slot numbers
+ */
+ sd_temp = sra->devs;
+ for (sd = sra->devs; sd; sd = sd->next) {
+ struct mdinfo *sd1 = sd;
+ struct mdinfo *sd1_next = sd1->next;
+ struct mdinfo *sd1_prev = NULL;
+ for (sd1 = sd; sd1; sd1 = sd1->next) {
+ if (sd1_next) {
+ if (sd1_next->disk.raid_disk < sd1->disk.raid_disk) {
+ if (sd == sd1)
+ sd = sd1_next;
+ if (sd1_prev)
+ sd1_prev->next = sd1_next;
+ sd1->next = sd1_next->next;
+ sd1_next->next = sd1;
+ }
+ }
+ }
+ }
+ /* Find devices that will be removed from the array */
+ d = 0;
+ sd_temp = sra->devs;
+ for (sd = sra->devs; sd; sd = sd->next, d++) {
+ int i, remove_all = 0;
+
+ if (sd->disk.state & (1<<MD_DISK_REMOVED))
+ continue;
+ if (!(sd->disk.state & (1<<MD_DISK_SYNC)))
+ in_sync--;
+
+ copies--;
+ if (!copies) {
+ /* We reached end of "mirrored" set of devices */
+ if (!in_sync) {
+ /* The array is failed and cannot be reshaped */
+ return 1;
+ }
+ /* Now mark all disks to be removed as faulty
+ * (leave only one in_sync disk) */
+ for (i = (d-nr_of_copies+1); i <= d; i++, sd_temp = sd_temp->next) {
+ if (sd_temp == NULL) {
+ /* error, array is wrong built
+ */
+ return 1;
+ }
+ if ((sd_temp->disk.state & (1<<MD_DISK_SYNC)) &&
+ (remove_all == 0)) {
+ /* this will be the candidate for Raid 0,
+ * leave it */
+ remove_all = 1;
+ continue;
+ } else {
+ /* this one will be removed */
+ sysfs_set_str(sra, sd_temp, "state", "faulty");
+ sysfs_set_str(sra, sd_temp, "slot", "none");
+ sysfs_set_str(sra, sd_temp, "state", "remove");
+ }
+ }
+ /* update in_sync and copies for the next set of devices */
+ in_sync = nr_of_copies;
+ copies = nr_of_copies;
+ sd_temp = sd->next;
+ }
+ }
+ return 0;
+}
+
int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
long long size,
int level, char *layout_str, int chunksize, int raid_disks)
@@ -872,7 +958,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
st->update_tail = &st->updates;
}
- sra = sysfs_read(fd, 0, GET_LEVEL);
+ sra = sysfs_read(fd, 0, GET_LEVEL | GET_DEVS | GET_STATE);
if (sra) {
if (st->ss->external && st->subarray[0] == 0) {
array.level = LEVEL_CONTAINER;
@@ -955,6 +1041,25 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
size = array.size;
}
+ /* ========= check for Raid10 -> Raid0 conversion ===============
+ * current implemenation assumes that following conditions must be met:
+ * - far_copies == 1
+ * - near_copies == 2
+ */
+ if (level == 0 && array.level == 10 &&
+ array.layout == ((1 << 8) + 2) && !(array.raid_disks & 1)) {
+ int err;
+ err = remove_disks_on_raid10_to_raid0_takeover(st, sra, array.layout);
+ if (err) {
+ dprintf(Name": Array cannot be reshaped\n");
+ if (container)
+ free(container);
+ if (cfd > -1)
+ close(cfd);
+ return 1;
+ }
+ }
+
/* ======= set level =========== */
if (level != UnSet && level != array.level) {
/* Trying to change the level.
--
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