From 4edb8530e889fc7b5e1b5471a0fbfd6c3c116b4a Mon Sep 17 00:00:00 2001

From: Pawel Baldysiak <pawel.baldysiak@intel.com>

Date: Wed, 3 Apr 2013 12:43:42 +1100

Subject: [PATCH] Add updating component_size to manager thread of mdmon

Mdmon does not update component_size now. It is wrong because in case

of size's expansion component_size is changed by mdadm but mdmon does not

reread its new value and uses a wrong, old one. As a result the metadata

is incorrect during size's expansion. It contains no information that

resync is in progress (there is no checkpoint too). The metadata is

as if resync has already been finished but it has not.

Component_size will be set to match information in sysfs. This value

will be updated by manager thread in manage_member() function.

Now mdmon uses the correct, current value of component_size and the

correct metadata (containing information about resync and checkpoint)

is written.

Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>

Signed-off-by: NeilBrown <neilb@suse.de>

---

 managemon.c | 4 ++++

 1 file changed, 4 insertions(+)

diff --git a/managemon.c b/managemon.c

index d155b04..2c55b3c 100644

--- a/managemon.c

+++ b/managemon.c

@@ -444,6 +444,7 @@ static void manage_member(struct mdstat_ent *mdstat,

 	char buf[64];

 	int frozen;

 	struct supertype *container = a->container;

+	unsigned long long int component_size = 0;

 	if (container == NULL)

 		/* Raced with something */

@@ -453,6 +454,9 @@ static void manage_member(struct mdstat_ent *mdstat,

 	a->info.array.raid_disks = mdstat->raid_disks;

 	// MORE

+	if (sysfs_get_ll(&a->info, NULL, "component_size", &component_size) >= 0)

+		a->info.component_size = component_size << 1;

+

 	/* honor 'frozen' */

 	if (sysfs_get_str(&a->info, NULL, "metadata_version", buf, sizeof(buf)) > 0)

 		frozen = buf[9] == '-';

-- 

1.8.1.4