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Message-Id: <1070521013316.6714@suse.de>
Date: Mon, 21 May 2007 11:33:16 +1000
From: NeilBrown <neilb@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Neil Brown <neilb@...e.de>
Subject: [PATCH 003 of 7] md: Fix bug with linear hot-add and elsewhere.
Adding a drive to a linear array seems to have stopped working,
due to changes elsewhere in md, and insufficient ongoing testing...
So the patch to make linear hot-add work in the first place
introduced a subtle bug elsewhere that interracts poorly with
older version of mdadm.
This fixes it all up.
Signed-off-by: Neil Brown <neilb@...e.de>
### Diffstat output
./drivers/md/linear.c | 10 +++++-----
./drivers/md/md.c | 20 ++++++++++++++------
2 files changed, 19 insertions(+), 11 deletions(-)
diff .prev/drivers/md/linear.c ./drivers/md/linear.c
--- .prev/drivers/md/linear.c 2007-05-21 11:13:25.000000000 +1000
+++ ./drivers/md/linear.c 2007-05-21 11:13:39.000000000 +1000
@@ -139,8 +139,6 @@ static linear_conf_t *linear_conf(mddev_
if (!conf)
return NULL;
- mddev->private = conf;
-
cnt = 0;
conf->array_size = 0;
@@ -232,7 +230,7 @@ static linear_conf_t *linear_conf(mddev_
* First calculate the device offsets.
*/
conf->disks[0].offset = 0;
- for (i=1; i<mddev->raid_disks; i++)
+ for (i=1; i < raid_disks; i++)
conf->disks[i].offset =
conf->disks[i-1].offset +
conf->disks[i-1].size;
@@ -244,7 +242,7 @@ static linear_conf_t *linear_conf(mddev_
curr_offset < conf->array_size;
curr_offset += conf->hash_spacing) {
- while (i < mddev->raid_disks-1 &&
+ while (i < raid_disks-1 &&
curr_offset >= conf->disks[i+1].offset)
i++;
@@ -299,9 +297,11 @@ static int linear_add(mddev_t *mddev, md
*/
linear_conf_t *newconf;
- if (rdev->raid_disk != mddev->raid_disks)
+ if (rdev->saved_raid_disk != mddev->raid_disks)
return -EINVAL;
+ rdev->raid_disk = rdev->saved_raid_disk;
+
newconf = linear_conf(mddev,mddev->raid_disks+1);
if (!newconf)
diff .prev/drivers/md/md.c ./drivers/md/md.c
--- .prev/drivers/md/md.c 2007-05-21 11:13:25.000000000 +1000
+++ ./drivers/md/md.c 2007-05-21 11:14:54.000000000 +1000
@@ -1298,8 +1298,9 @@ static void super_1_sync(mddev_t *mddev,
ITERATE_RDEV(mddev,rdev2,tmp)
if (rdev2->desc_nr+1 > max_dev)
max_dev = rdev2->desc_nr+1;
-
- sb->max_dev = cpu_to_le32(max_dev);
+
+ if (max_dev > le32_to_cpu(sb->max_dev))
+ sb->max_dev = cpu_to_le32(max_dev);
for (i=0; i<max_dev;i++)
sb->dev_roles[i] = cpu_to_le16(0xfffe);
@@ -1365,10 +1366,14 @@ static int bind_rdev_to_array(mdk_rdev_t
}
/* make sure rdev->size exceeds mddev->size */
if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
- if (mddev->pers)
- /* Cannot change size, so fail */
- return -ENOSPC;
- else
+ if (mddev->pers) {
+ /* Cannot change size, so fail
+ * If mddev->level <= 0, then we don't care
+ * about aligning sizes (e.g. linear)
+ */
+ if (mddev->level > 0)
+ return -ENOSPC;
+ } else
mddev->size = rdev->size;
}
@@ -2142,6 +2147,9 @@ static void analyze_sbs(mddev_t * mddev)
rdev->desc_nr = i++;
rdev->raid_disk = rdev->desc_nr;
set_bit(In_sync, &rdev->flags);
+ } else if (rdev->raid_disk >= mddev->raid_disks) {
+ rdev->raid_disk = -1;
+ clear_bit(In_sync, &rdev->flags);
}
}
-
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