imsm does not support raid10 array larger then 4-drives
so takeover to raid10 is allowed only from 2-drive raid0.
Signed-off-by: Krzysztof Wojcik <krzysztof.wojcik@xxxxxxxxx>
---
Grow.c | 1 +
super-intel.c | 24 +++++++++++++++++++++++-
2 files changed, 24 insertions(+), 1 deletions(-)
diff --git a/Grow.c b/Grow.c
index 3d74db1..a01051f 100644
--- a/Grow.c
+++ b/Grow.c
@@ -1305,6 +1305,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
rv = 1;/* not possible */
goto release;
}
+
if (level > 0) {
err = sysfs_set_str(sra, NULL, "level", c);
if (err) {
diff --git a/super-intel.c b/super-intel.c
index 0488c1c..395e7b9 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -6342,8 +6342,30 @@ static int update_level_imsm(struct supertype *st, struct mdinfo *info,
((info->array.level != 0) && (geo->level != 10)))
return 1;
- dev = __get_imsm_dev(super->anchor, 0);
+ /* imsm does not support raid0 to raid10 takeover for 2-drive raid0 */
+ if ((geo->level == 10) &&
+ (info->array.level == 0) &&
+ (info->array.raid_disks > 2)) {
+ fprintf(stderr, "imsm: Cannot set level to %i for array %s "\
+ "(number of drives > 2)\n",
+ geo->level,
+ geo->dev_name);
+ /* return to raid0 */
+ char fname[PATH_MAX];
+ int fd;
+ sprintf(fname, "/sys/block/md%i/md/level", geo->dev_id);
+ fd = open(fname, O_WRONLY);
+ if (fd < 0)
+ return 1;
+ if (write(fd, "raid0", 5) != 5)
+ dprintf(Name ": failed to write raid0 to '%s' (%s)\n",
+ fname,
+ strerror(errno));
+ close(fd);
+ return 1;
+ }
+ dev = __get_imsm_dev(super->anchor, 0);
map = get_imsm_map(dev, 0);
geo->raid_disks = (geo->level == 10) ? 4 : map->num_members;
--
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