mdadm/0119-Don-t-associate-spares-with-other-arrays-during-RAID.patch

From 601ffa784f03cea843b9b732e561ffea0b8c036f Mon Sep 17 00:00:00 2001
From: Oleksandr Shchirskyi <oleksandr.shchirskyi@linux.intel.com>
Date: Fri, 18 Jun 2021 15:53:32 +0200
Subject: [PATCH] Don't associate spares with other arrays during RAID Examine
Git-commit: 601ffa784f03cea843b9b732e561ffea0b8c036f
Patch-mainline: mdadm-4.1+
References: bsc#1180661, bsc#1182642

Spares in imsm belong to containers, not volumes, and must go into
a separate container when assembling the RAID.
Remove association spares with other arrays and make Examine print
separate containers for spares.
Auto assemble without config file already works like this. So make
creating a config file and assembling from it consistent with auto
assemble.
With this change, mdadm -Es will add this line to output if spares
are found:
ARRAY metadata=imsm UUID=00000000:00000000:00000000:00000000

Signed-off-by: Oleksandr Shchirskyi <oleksandr.shchirskyi@linux.intel.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>
Acked-by: Coly Li <colyli@suse.de>
---
 Examine.c     |  2 +-
 super-intel.c | 74 +++++++++++++--------------------------------------
 2 files changed, 20 insertions(+), 56 deletions(-)

Index: mdadm-4.1/Examine.c
===================================================================
--- mdadm-4.1.orig/Examine.c
+++ mdadm-4.1/Examine.c
@@ -166,7 +166,7 @@ int Examine(struct mddev_dev *devlist,
 			int newline = 0;
 
 			ap->st->ss->brief_examine_super(ap->st, c->verbose > 0);
-			if (ap->spares)
+			if (ap->spares && !ap->st->ss->external)
 				newline += printf("   spares=%d", ap->spares);
 			if (c->verbose > 0) {
 				newline += printf("   devices");
Index: mdadm-4.1/super-intel.c
===================================================================
--- mdadm-4.1.orig/super-intel.c
+++ mdadm-4.1/super-intel.c
@@ -2084,12 +2084,6 @@ static void brief_examine_super_imsm(str
 	/* We just write a generic IMSM ARRAY entry */
 	struct mdinfo info;
 	char nbuf[64];
-	struct intel_super *super = st->sb;
-
-	if (!super->anchor->num_raid_devs) {
-		printf("ARRAY metadata=imsm\n");
-		return;
-	}
 
 	getinfo_super_imsm(st, &info, NULL);
 	fname_from_uuid(st, &info, nbuf, ':');
@@ -3835,12 +3829,9 @@ static void imsm_copy_dev(struct imsm_de
 
 static int compare_super_imsm(struct supertype *st, struct supertype *tst)
 {
-	/*
-	 * return:
+	/*  return:
 	 *  0 same, or first was empty, and second was copied
-	 *  1 second had wrong number
-	 *  2 wrong uuid
-	 *  3 wrong other info
+	 *  1 sb are different
 	 */
 	struct intel_super *first = st->sb;
 	struct intel_super *sec = tst->sb;
@@ -3852,27 +3843,27 @@ static int compare_super_imsm(struct sup
 	}
 	/* in platform dependent environment test if the disks
 	 * use the same Intel hba
-	 * If not on Intel hba at all, allow anything.
+	 * if not on Intel hba at all, allow anything.
+	 * doesn't check HBAs if num_raid_devs is not set, as it means
+	 * it is a free floating spare, and all spares regardless of HBA type
+	 * will fall into separate container during the assembly
 	 */
-	if (!check_env("IMSM_NO_PLATFORM") && first->hba && sec->hba) {
+	if (first->hba && sec->hba && first->anchor->num_raid_devs != 0) {
 		if (first->hba->type != sec->hba->type) {
 			fprintf(stderr,
 				"HBAs of devices do not match %s != %s\n",
 				get_sys_dev_type(first->hba->type),
 				get_sys_dev_type(sec->hba->type));
-			return 3;
+			return 1;
 		}
 		if (first->orom != sec->orom) {
 			fprintf(stderr,
 				"HBAs of devices do not match %s != %s\n",
 				first->hba->pci_id, sec->hba->pci_id);
-			return 3;
+			return 1;
 		}
 	}
 
-	/* if an anchor does not have num_raid_devs set then it is a free
-	 * floating spare
-	 */
 	if (first->anchor->num_raid_devs > 0 &&
 	    sec->anchor->num_raid_devs > 0) {
 		/* Determine if these disks might ever have been
@@ -3884,7 +3875,7 @@ static int compare_super_imsm(struct sup
 
 		if (memcmp(first->anchor->sig, sec->anchor->sig,
 			   MAX_SIGNATURE_LENGTH) != 0)
-			return 3;
+			return 1;
 
 		if (first_family == 0)
 			first_family = first->anchor->family_num;
@@ -3892,43 +3883,17 @@ static int compare_super_imsm(struct sup
 			sec_family = sec->anchor->family_num;
 
 		if (first_family != sec_family)
-			return 3;
+			return 1;
 
 	}
 
-	/* if 'first' is a spare promote it to a populated mpb with sec's
-	 * family number
-	 */
-	if (first->anchor->num_raid_devs == 0 &&
-	    sec->anchor->num_raid_devs > 0) {
-		int i;
-		struct intel_dev *dv;
-		struct imsm_dev *dev;
-
-		/* we need to copy raid device info from sec if an allocation
-		 * fails here we don't associate the spare
-		 */
-		for (i = 0; i < sec->anchor->num_raid_devs; i++) {
-			dv = xmalloc(sizeof(*dv));
-			dev = xmalloc(sizeof_imsm_dev(get_imsm_dev(sec, i), 1));
-			dv->dev = dev;
-			dv->index = i;
-			dv->next = first->devlist;
-			first->devlist = dv;
-		}
-		if (i < sec->anchor->num_raid_devs) {
-			/* allocation failure */
-			free_devlist(first);
-			pr_err("imsm: failed to associate spare\n");
-			return 3;
-		}
-		first->anchor->num_raid_devs = sec->anchor->num_raid_devs;
-		first->anchor->orig_family_num = sec->anchor->orig_family_num;
-		first->anchor->family_num = sec->anchor->family_num;
-		memcpy(first->anchor->sig, sec->anchor->sig, MAX_SIGNATURE_LENGTH);
-		for (i = 0; i < sec->anchor->num_raid_devs; i++)
-			imsm_copy_dev(get_imsm_dev(first, i), get_imsm_dev(sec, i));
-	}
+	/* if an anchor does not have num_raid_devs set then it is a free
+	* floating spare. don't assosiate spare with any array, as during assembly
+	* spares shall fall into separate container, from which they can be moved
+	* when necessary
+	*/
+	if (first->anchor->num_raid_devs ^ sec->anchor->num_raid_devs)
+		return 1;
 
 	return 0;
 }