mdadm/0024-imsm-fix-spare-activation-for-old-matrix-arrays.patch

From 05501181f18cdccdb0b3cec1d8cf59f0995504d7 Mon Sep 17 00:00:00 2001
From: Pawel Baldysiak <pawel.baldysiak@intel.com>
Date: Fri, 8 Mar 2019 12:19:11 +0100
Subject: [PATCH] imsm: fix spare activation for old matrix arrays
Git-commit: 05501181f18cdccdb0b3cec1d8cf59f0995504d7
Patch-mainline: mdadm-4.1+
References: jsc#SLE-10078, jsc#SLE-9348

During spare activation get_extents() calculates metadata reserved space based
on smallest active RAID member or it will take the defaults. Since patch
611d9529("imsm: change reserved space to 4MB") default is extended.  If array
was created prior that patch, reserved space is smaller. In case of matrix
RAID - spare is activated in each array one-by-one, so it is spare for first
activation, but treated as "active" during second one.

In case of adding spare drive to old matrix RAID with the size the same as
already existing member drive the routine will take the defaults during second
run and mdmon will refuse to rebuild second volume, claiming that the drive
does not have enough free space.

Add parameter to get_extents(), so the during spare activation reserved space
is always based on smallest active drive - even if given drive is already
active in some other array of matrix RAID.

Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>
Signed-off-by: Coly Li <colyli@suse.de>

---
 super-intel.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/super-intel.c b/super-intel.c
index c399433..5a7c9f8 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -1313,7 +1313,8 @@ static unsigned long long per_dev_array_size(struct imsm_map *map)
 	return array_size;
 }
 
-static struct extent *get_extents(struct intel_super *super, struct dl *dl)
+static struct extent *get_extents(struct intel_super *super, struct dl *dl,
+				  int get_minimal_reservation)
 {
 	/* find a list of used extents on the given physical device */
 	struct extent *rv, *e;
@@ -1325,7 +1326,7 @@ static struct extent *get_extents(struct intel_super *super, struct dl *dl)
 	 * regardless of whether the OROM has assigned sectors from the
 	 * IMSM_RESERVED_SECTORS region
 	 */
-	if (dl->index == -1)
+	if (dl->index == -1 || get_minimal_reservation)
 		reservation = imsm_min_reserved_sectors(super);
 	else
 		reservation = MPB_SECTOR_CNT + IMSM_RESERVED_SECTORS;
@@ -1386,7 +1387,7 @@ static __u32 imsm_reserved_sectors(struct intel_super *super, struct dl *dl)
 	if (dl->index == -1)
 		return MPB_SECTOR_CNT;
 
-	e = get_extents(super, dl);
+	e = get_extents(super, dl, 0);
 	if (!e)
 		return MPB_SECTOR_CNT + IMSM_RESERVED_SECTORS;
 
@@ -1478,7 +1479,7 @@ static __u32 imsm_min_reserved_sectors(struct intel_super *super)
 		return rv;
 
 	/* find last lba used by subarrays on the smallest active disk */
-	e = get_extents(super, dl_min);
+	e = get_extents(super, dl_min, 0);
 	if (!e)
 		return rv;
 	for (i = 0; e[i].size; i++)
@@ -1519,7 +1520,7 @@ int get_spare_criteria_imsm(struct supertype *st, struct spare_criteria *c)
 	if (!dl)
 		return -EINVAL;
 	/* find last lba used by subarrays */
-	e = get_extents(super, dl);
+	e = get_extents(super, dl, 0);
 	if (!e)
 		return -EINVAL;
 	for (i = 0; e[i].size; i++)
@@ -7203,7 +7204,7 @@ static int validate_geometry_imsm_volume(struct supertype *st, int level,
 
 			pos = 0;
 			i = 0;
-			e = get_extents(super, dl);
+			e = get_extents(super, dl, 0);
 			if (!e) continue;
 			do {
 				unsigned long long esize;
@@ -7261,7 +7262,7 @@ static int validate_geometry_imsm_volume(struct supertype *st, int level,
 	}
 
 	/* retrieve the largest free space block */
-	e = get_extents(super, dl);
+	e = get_extents(super, dl, 0);
 	maxsize = 0;
 	i = 0;
 	if (e) {
@@ -7359,7 +7360,7 @@ static int imsm_get_free_size(struct supertype *st, int raiddisks,
 		if (super->orom && dl->index < 0 && mpb->num_raid_devs)
 			continue;
 
-		e = get_extents(super, dl);
+		e = get_extents(super, dl, 0);
 		if (!e)
 			continue;
 		for (i = 1; e[i-1].size; i++)
@@ -8846,7 +8847,7 @@ static struct dl *imsm_add_spare(struct intel_super *super, int slot,
 		/* Does this unused device have the requisite free space?
 		 * It needs to be able to cover all member volumes
 		 */
-		ex = get_extents(super, dl);
+		ex = get_extents(super, dl, 1);
 		if (!ex) {
 			dprintf("cannot get extents\n");
 			continue;
-- 
2.25.0