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md: Fix handling of raid5 array which is being reshaped to fewer devices. 

When a raid5 (or raid6) array is being reshaped to have fewer devices,
conf->raid_disks is the latter and hence smaller number of devices.
However sometimes we want to use a number which is the total number of
currently required devices - the larger of the 'old' and 'new' sizes.
Before we implemented reducing the number of devices, this was always
'new' i.e. ->raid_disks.
Now we need max(raid_disks, previous_raid_disks) in those places.

This particularly affects assembling an array that was shutdown while
in the middle of a reshape to fewer devices.

md.c needs a similar fix when interpreting the md metadata.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-10-16 16:35:30 +11:00
parent e4424fee18
commit 5e5e3e78ed
2 changed files with 19 additions and 20 deletions
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2
drivers/md/md.c
View File

@ -2631,7 +2631,7 @@ 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) {
} else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) {
rdev->raid_disk = -1;
clear_bit(In_sync, &rdev->flags);
}

37
drivers/md/raid5.c
View File

@ -1238,22 +1238,22 @@ static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
static int grow_one_stripe(raid5_conf_t *conf)
{
struct stripe_head *sh;
int disks = max(conf->raid_disks, conf->previous_raid_disks);
sh = kmem_cache_alloc(conf->slab_cache, GFP_KERNEL);
if (!sh)
return 0;
memset(sh, 0, sizeof(*sh) + (conf->raid_disks-1)*sizeof(struct r5dev));
memset(sh, 0, sizeof(*sh) + (disks-1)*sizeof(struct r5dev));
sh->raid_conf = conf;
spin_lock_init(&sh->lock);
#ifdef CONFIG_MULTICORE_RAID456
init_waitqueue_head(&sh->ops.wait_for_ops);
#endif
if (grow_buffers(sh, conf->raid_disks)) {
shrink_buffers(sh, conf->raid_disks);
if (grow_buffers(sh, disks)) {
shrink_buffers(sh, disks);
kmem_cache_free(conf->slab_cache, sh);
return 0;
}
sh->disks = conf->raid_disks;
/* we just created an active stripe so... */
atomic_set(&sh->count, 1);
atomic_inc(&conf->active_stripes);
@ -1265,7 +1265,7 @@ static int grow_one_stripe(raid5_conf_t *conf)
static int grow_stripes(raid5_conf_t *conf, int num)
{
struct kmem_cache *sc;
int devs = conf->raid_disks;
int devs = max(conf->raid_disks, conf->previous_raid_disks);
sprintf(conf->cache_name[0],
"raid%d-%s", conf->level, mdname(conf->mddev));
@ -3540,9 +3540,10 @@ static void unplug_slaves(mddev_t *mddev)
{
raid5_conf_t *conf = mddev->private;
int i;
int devs = max(conf->raid_disks, conf->previous_raid_disks);
rcu_read_lock();
for (i = 0; i < conf->raid_disks; i++) {
for (i = 0; i < devs; i++) {
mdk_rdev_t *rdev = rcu_dereference(conf->disks[i].rdev);
if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) {
struct request_queue *r_queue = bdev_get_queue(rdev->bdev);
@ -4562,13 +4563,9 @@ raid5_size(mddev_t *mddev, sector_t sectors, int raid_disks)
if (!sectors)
sectors = mddev->dev_sectors;
if (!raid_disks) {
if (!raid_disks)
/* size is defined by the smallest of previous and new size */
if (conf->raid_disks < conf->previous_raid_disks)
raid_disks = conf->raid_disks;
else
raid_disks = conf->previous_raid_disks;
}
raid_disks = min(conf->raid_disks, conf->previous_raid_disks);
sectors &= ~((sector_t)mddev->chunk_sectors - 1);
sectors &= ~((sector_t)mddev->new_chunk_sectors - 1);
@ -4669,7 +4666,7 @@ static int raid5_alloc_percpu(raid5_conf_t *conf)
}
per_cpu_ptr(conf->percpu, cpu)->spare_page = spare_page;
}
scribble = kmalloc(scribble_len(conf->raid_disks), GFP_KERNEL);
scribble = kmalloc(conf->scribble_len, GFP_KERNEL);
if (!scribble) {
err = -ENOMEM;
break;
@ -4690,7 +4687,7 @@ static int raid5_alloc_percpu(raid5_conf_t *conf)
static raid5_conf_t *setup_conf(mddev_t *mddev)
{
raid5_conf_t *conf;
int raid_disk, memory;
int raid_disk, memory, max_disks;
mdk_rdev_t *rdev;
struct disk_info *disk;
@ -4740,13 +4737,14 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
conf->bypass_threshold = BYPASS_THRESHOLD;
conf->raid_disks = mddev->raid_disks;
conf->scribble_len = scribble_len(conf->raid_disks);
if (mddev->reshape_position == MaxSector)
conf->previous_raid_disks = mddev->raid_disks;
else
conf->previous_raid_disks = mddev->raid_disks - mddev->delta_disks;
max_disks = max(conf->raid_disks, conf->previous_raid_disks);
conf->scribble_len = scribble_len(max_disks);
conf->disks = kzalloc(conf->raid_disks * sizeof(struct disk_info),
conf->disks = kzalloc(max_disks * sizeof(struct disk_info),
GFP_KERNEL);
if (!conf->disks)
goto abort;
@ -4764,7 +4762,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
list_for_each_entry(rdev, &mddev->disks, same_set) {
raid_disk = rdev->raid_disk;
if (raid_disk >= conf->raid_disks
if (raid_disk >= max_disks
|| raid_disk < 0)
continue;
disk = conf->disks + raid_disk;
@ -4796,7 +4794,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
}
memory = conf->max_nr_stripes * (sizeof(struct stripe_head) +
conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024;
max_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024;
if (grow_stripes(conf, conf->max_nr_stripes)) {
printk(KERN_ERR
"raid5: couldn't allocate %dkB for buffers\n", memory);
@ -4921,7 +4919,8 @@ static int run(mddev_t *mddev)
test_bit(In_sync, &rdev->flags))
working_disks++;
mddev->degraded = conf->raid_disks - working_disks;
mddev->degraded = (max(conf->raid_disks, conf->previous_raid_disks)
- working_disks);
if (mddev->degraded > conf->max_degraded) {
printk(KERN_ERR "raid5: not enough operational devices for %s"