[PATCH 6/6] imsm: block changing slots during creation

[Coly Li <colyli@suse.de>]

From: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>

If user specifies drives for array creation, then slot order across
volumes is not preserved.
Ideally, it should be checked in validate_geometry() but it is not
possible in current implementation (order is determined later).
Add verification in add_to_super_imsm_volume() and throw error if
mismatch is detected.
IMSM allows to use only same members within container.
This is not hardware dependency but metadata limitation.
Therefore, 09-imsm-overlap test is removed. Testing it is pointless.
After this patch, creation in this scenario is blocked. Offset
verification is covered in other tests.

Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
Acked-by: Coly Li <colyli@suse.de>
---
 super-intel.c        | 33 ++++++++++++++++++++++-----------
 tests/09imsm-overlap | 28 ----------------------------
 2 files changed, 22 insertions(+), 39 deletions(-)
 delete mode 100644 tests/09imsm-overlap

diff --git a/super-intel.c b/super-intel.c
index deef7c87..8ffe485c 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -5789,6 +5789,10 @@ static int add_to_super_imsm_volume(struct supertype *st, mdu_disk_info_t *dk,
 	struct imsm_map *map;
 	struct dl *dl, *df;
 	int slot;
+	int autolayout = 0;
+
+	if (!is_fd_valid(fd))
+		autolayout = 1;
 
 	dev = get_imsm_dev(super, super->current_vol);
 	map = get_imsm_map(dev, MAP_0);
@@ -5799,25 +5803,32 @@ static int add_to_super_imsm_volume(struct supertype *st, mdu_disk_info_t *dk,
 		return 1;
 	}
 
-	if (!is_fd_valid(fd)) {
-		/* we're doing autolayout so grab the pre-marked (in
-		 * validate_geometry) raid_disk
-		 */
-		for (dl = super->disks; dl; dl = dl->next)
+	for (dl = super->disks; dl ; dl = dl->next) {
+		if (autolayout) {
 			if (dl->raiddisk == dk->raid_disk)
 				break;
-	} else {
-		for (dl = super->disks; dl ; dl = dl->next)
-			if (dl->major == dk->major &&
-			    dl->minor == dk->minor)
-				break;
+		} else if (dl->major == dk->major && dl->minor == dk->minor)
+			break;
 	}
 
 	if (!dl) {
-		pr_err("%s is not a member of the same container\n", devname);
+		if (!autolayout)
+			pr_err("%s is not a member of the same container.\n",
+			       devname);
 		return 1;
 	}
 
+	if (!autolayout && super->current_vol > 0) {
+		int _slot = get_disk_slot_in_dev(super, 0, dl->index);
+
+		if (_slot != dk->raid_disk) {
+			pr_err("Member %s is in %d slot for the first volume, but is in %d slot for a new volume.\n",
+			       dl->devname, _slot, dk->raid_disk);
+			pr_err("Raid members are in different order than for the first volume, aborting.\n");
+			return 1;
+		}
+	}
+
 	if (mpb->num_disks == 0)
 		if (!get_dev_sector_size(dl->fd, dl->devname,
 					 &super->sector_size))
diff --git a/tests/09imsm-overlap b/tests/09imsm-overlap
deleted file mode 100644
index ff5d2093..00000000
--- a/tests/09imsm-overlap
+++ /dev/null
@@ -1,28 +0,0 @@
-
-. tests/env-imsm-template
-
-# create raid arrays with varying degress of overlap
-mdadm -CR $container -e imsm -n 6 $dev0 $dev1 $dev2 $dev3 $dev4 $dev5
-imsm_check container 6
-
-size=1024
-level=1
-num_disks=2
-mdadm -CR $member0 $dev0 $dev1 -n $num_disks -l $level -z $size
-mdadm -CR $member1 $dev1 $dev2 -n $num_disks -l $level -z $size
-mdadm -CR $member2 $dev2 $dev3 -n $num_disks -l $level -z $size
-mdadm -CR $member3 $dev3 $dev4 -n $num_disks -l $level -z $size
-mdadm -CR $member4 $dev4 $dev5 -n $num_disks -l $level -z $size
-
-udevadm settle
-
-offset=0
-imsm_check member $member0 $num_disks $level $size 1024 $offset
-offset=$((offset+size+4096))
-imsm_check member $member1 $num_disks $level $size 1024 $offset
-offset=$((offset+size+4096))
-imsm_check member $member2 $num_disks $level $size 1024 $offset
-offset=$((offset+size+4096))
-imsm_check member $member3 $num_disks $level $size 1024 $offset
-offset=$((offset+size+4096))
-imsm_check member $member4 $num_disks $level $size 1024 $offset
-- 
2.35.3