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-rw-r--r--drivers/md/raid10.c300
1 files changed, 198 insertions, 102 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index e2766d8..0372499 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -24,6 +24,7 @@
#include <linux/seq_file.h>
#include "md.h"
#include "raid10.h"
+#include "raid0.h"
#include "bitmap.h"
/*
@@ -255,7 +256,7 @@ static inline void update_head_pos(int slot, r10bio_t *r10_bio)
static void raid10_end_read_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
- r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
+ r10bio_t *r10_bio = bio->bi_private;
int slot, dev;
conf_t *conf = r10_bio->mddev->private;
@@ -285,7 +286,8 @@ static void raid10_end_read_request(struct bio *bio, int error)
*/
char b[BDEVNAME_SIZE];
if (printk_ratelimit())
- printk(KERN_ERR "raid10: %s: rescheduling sector %llu\n",
+ printk(KERN_ERR "md/raid10:%s: %s: rescheduling sector %llu\n",
+ mdname(conf->mddev),
bdevname(conf->mirrors[dev].rdev->bdev,b), (unsigned long long)r10_bio->sector);
reschedule_retry(r10_bio);
}
@@ -296,7 +298,7 @@ static void raid10_end_read_request(struct bio *bio, int error)
static void raid10_end_write_request(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
- r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
+ r10bio_t *r10_bio = bio->bi_private;
int slot, dev;
conf_t *conf = r10_bio->mddev->private;
@@ -494,7 +496,7 @@ static int raid10_mergeable_bvec(struct request_queue *q,
*/
static int read_balance(conf_t *conf, r10bio_t *r10_bio)
{
- const unsigned long this_sector = r10_bio->sector;
+ const sector_t this_sector = r10_bio->sector;
int disk, slot, nslot;
const int sectors = r10_bio->sectors;
sector_t new_distance, current_distance;
@@ -601,7 +603,7 @@ static void unplug_slaves(mddev_t *mddev)
int i;
rcu_read_lock();
- for (i=0; i<mddev->raid_disks; i++) {
+ for (i=0; i < conf->raid_disks; i++) {
mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && !test_bit(Faulty, &rdev->flags) && atomic_read(&rdev->nr_pending)) {
struct request_queue *r_queue = bdev_get_queue(rdev->bdev);
@@ -635,7 +637,7 @@ static int raid10_congested(void *data, int bits)
if (mddev_congested(mddev, bits))
return 1;
rcu_read_lock();
- for (i = 0; i < mddev->raid_disks && ret == 0; i++) {
+ for (i = 0; i < conf->raid_disks && ret == 0; i++) {
mdk_rdev_t *rdev = rcu_dereference(conf->mirrors[i].rdev);
if (rdev && !test_bit(Faulty, &rdev->flags)) {
struct request_queue *q = bdev_get_queue(rdev->bdev);
@@ -788,14 +790,12 @@ static void unfreeze_array(conf_t *conf)
spin_unlock_irq(&conf->resync_lock);
}
-static int make_request(struct request_queue *q, struct bio * bio)
+static int make_request(mddev_t *mddev, struct bio * bio)
{
- mddev_t *mddev = q->queuedata;
conf_t *conf = mddev->private;
mirror_info_t *mirror;
r10bio_t *r10_bio;
struct bio *read_bio;
- int cpu;
int i;
int chunk_sects = conf->chunk_mask + 1;
const int rw = bio_data_dir(bio);
@@ -825,16 +825,16 @@ static int make_request(struct request_queue *q, struct bio * bio)
*/
bp = bio_split(bio,
chunk_sects - (bio->bi_sector & (chunk_sects - 1)) );
- if (make_request(q, &bp->bio1))
+ if (make_request(mddev, &bp->bio1))
generic_make_request(&bp->bio1);
- if (make_request(q, &bp->bio2))
+ if (make_request(mddev, &bp->bio2))
generic_make_request(&bp->bio2);
bio_pair_release(bp);
return 0;
bad_map:
- printk("raid10_make_request bug: can't convert block across chunks"
- " or bigger than %dk %llu %d\n", chunk_sects/2,
+ printk("md/raid10:%s: make_request bug: can't convert block across chunks"
+ " or bigger than %dk %llu %d\n", mdname(mddev), chunk_sects/2,
(unsigned long long)bio->bi_sector, bio->bi_size >> 10);
bio_io_error(bio);
@@ -850,12 +850,6 @@ static int make_request(struct request_queue *q, struct bio * bio)
*/
wait_barrier(conf);
- cpu = part_stat_lock();
- part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
- part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
- bio_sectors(bio));
- part_stat_unlock();
-
r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);
r10_bio->master_bio = bio;
@@ -1039,9 +1033,10 @@ static void error(mddev_t *mddev, mdk_rdev_t *rdev)
}
set_bit(Faulty, &rdev->flags);
set_bit(MD_CHANGE_DEVS, &mddev->flags);
- printk(KERN_ALERT "raid10: Disk failure on %s, disabling device.\n"
- "raid10: Operation continuing on %d devices.\n",
- bdevname(rdev->bdev,b), conf->raid_disks - mddev->degraded);
+ printk(KERN_ALERT "md/raid10:%s: Disk failure on %s, disabling device.\n"
+ KERN_ALERT "md/raid10:%s: Operation continuing on %d devices.\n",
+ mdname(mddev), bdevname(rdev->bdev, b),
+ mdname(mddev), conf->raid_disks - mddev->degraded);
}
static void print_conf(conf_t *conf)
@@ -1049,19 +1044,19 @@ static void print_conf(conf_t *conf)
int i;
mirror_info_t *tmp;
- printk("RAID10 conf printout:\n");
+ printk(KERN_DEBUG "RAID10 conf printout:\n");
if (!conf) {
- printk("(!conf)\n");
+ printk(KERN_DEBUG "(!conf)\n");
return;
}
- printk(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded,
+ printk(KERN_DEBUG " --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded,
conf->raid_disks);
for (i = 0; i < conf->raid_disks; i++) {
char b[BDEVNAME_SIZE];
tmp = conf->mirrors + i;
if (tmp->rdev)
- printk(" disk %d, wo:%d, o:%d, dev:%s\n",
+ printk(KERN_DEBUG " disk %d, wo:%d, o:%d, dev:%s\n",
i, !test_bit(In_sync, &tmp->rdev->flags),
!test_bit(Faulty, &tmp->rdev->flags),
bdevname(tmp->rdev->bdev,b));
@@ -1132,7 +1127,7 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
int mirror;
mirror_info_t *p;
int first = 0;
- int last = mddev->raid_disks - 1;
+ int last = conf->raid_disks - 1;
if (mddev->recovery_cp < MaxSector)
/* only hot-add to in-sync arrays, as recovery is
@@ -1224,7 +1219,7 @@ abort:
static void end_sync_read(struct bio *bio, int error)
{
- r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
+ r10bio_t *r10_bio = bio->bi_private;
conf_t *conf = r10_bio->mddev->private;
int i,d;
@@ -1261,7 +1256,7 @@ static void end_sync_read(struct bio *bio, int error)
static void end_sync_write(struct bio *bio, int error)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
- r10bio_t * r10_bio = (r10bio_t *)(bio->bi_private);
+ r10bio_t *r10_bio = bio->bi_private;
mddev_t *mddev = r10_bio->mddev;
conf_t *conf = mddev->private;
int i,d;
@@ -1510,13 +1505,14 @@ static void fix_read_error(conf_t *conf, mddev_t *mddev, r10bio_t *r10_bio)
if (cur_read_error_count > max_read_errors) {
rcu_read_unlock();
printk(KERN_NOTICE
- "raid10: %s: Raid device exceeded "
+ "md/raid10:%s: %s: Raid device exceeded "
"read_error threshold "
"[cur %d:max %d]\n",
+ mdname(mddev),
b, cur_read_error_count, max_read_errors);
printk(KERN_NOTICE
- "raid10: %s: Failing raid "
- "device\n", b);
+ "md/raid10:%s: %s: Failing raid "
+ "device\n", mdname(mddev), b);
md_error(mddev, conf->mirrors[d].rdev);
return;
}
@@ -1586,15 +1582,16 @@ static void fix_read_error(conf_t *conf, mddev_t *mddev, r10bio_t *r10_bio)
== 0) {
/* Well, this device is dead */
printk(KERN_NOTICE
- "raid10:%s: read correction "
+ "md/raid10:%s: read correction "
"write failed"
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(sect+
rdev->data_offset),
bdevname(rdev->bdev, b));
- printk(KERN_NOTICE "raid10:%s: failing "
+ printk(KERN_NOTICE "md/raid10:%s: %s: failing "
"drive\n",
+ mdname(mddev),
bdevname(rdev->bdev, b));
md_error(mddev, rdev);
}
@@ -1622,20 +1619,21 @@ static void fix_read_error(conf_t *conf, mddev_t *mddev, r10bio_t *r10_bio)
READ) == 0) {
/* Well, this device is dead */
printk(KERN_NOTICE
- "raid10:%s: unable to read back "
+ "md/raid10:%s: unable to read back "
"corrected sectors"
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(sect+
rdev->data_offset),
bdevname(rdev->bdev, b));
- printk(KERN_NOTICE "raid10:%s: failing drive\n",
+ printk(KERN_NOTICE "md/raid10:%s: %s: failing drive\n",
+ mdname(mddev),
bdevname(rdev->bdev, b));
md_error(mddev, rdev);
} else {
printk(KERN_INFO
- "raid10:%s: read error corrected"
+ "md/raid10:%s: read error corrected"
" (%d sectors at %llu on %s)\n",
mdname(mddev), s,
(unsigned long long)(sect+
@@ -1710,8 +1708,9 @@ static void raid10d(mddev_t *mddev)
mddev->ro ? IO_BLOCKED : NULL;
mirror = read_balance(conf, r10_bio);
if (mirror == -1) {
- printk(KERN_ALERT "raid10: %s: unrecoverable I/O"
+ printk(KERN_ALERT "md/raid10:%s: %s: unrecoverable I/O"
" read error for block %llu\n",
+ mdname(mddev),
bdevname(bio->bi_bdev,b),
(unsigned long long)r10_bio->sector);
raid_end_bio_io(r10_bio);
@@ -1721,8 +1720,9 @@ static void raid10d(mddev_t *mddev)
bio_put(bio);
rdev = conf->mirrors[mirror].rdev;
if (printk_ratelimit())
- printk(KERN_ERR "raid10: %s: redirecting sector %llu to"
+ printk(KERN_ERR "md/raid10:%s: %s: redirecting sector %llu to"
" another mirror\n",
+ mdname(mddev),
bdevname(rdev->bdev,b),
(unsigned long long)r10_bio->sector);
bio = bio_clone(r10_bio->master_bio, GFP_NOIO);
@@ -1980,7 +1980,8 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
r10_bio = rb2;
if (!test_and_set_bit(MD_RECOVERY_INTR,
&mddev->recovery))
- printk(KERN_INFO "raid10: %s: insufficient working devices for recovery.\n",
+ printk(KERN_INFO "md/raid10:%s: insufficient "
+ "working devices for recovery.\n",
mdname(mddev));
break;
}
@@ -2140,9 +2141,9 @@ raid10_size(mddev_t *mddev, sector_t sectors, int raid_disks)
conf_t *conf = mddev->private;
if (!raid_disks)
- raid_disks = mddev->raid_disks;
+ raid_disks = conf->raid_disks;
if (!sectors)
- sectors = mddev->dev_sectors;
+ sectors = conf->dev_sectors;
size = sectors >> conf->chunk_shift;
sector_div(size, conf->far_copies);
@@ -2152,62 +2153,61 @@ raid10_size(mddev_t *mddev, sector_t sectors, int raid_disks)
return size << conf->chunk_shift;
}
-static int run(mddev_t *mddev)
+
+static conf_t *setup_conf(mddev_t *mddev)
{
- conf_t *conf;
- int i, disk_idx, chunk_size;
- mirror_info_t *disk;
- mdk_rdev_t *rdev;
+ conf_t *conf = NULL;
int nc, fc, fo;
sector_t stride, size;
+ int err = -EINVAL;
if (mddev->chunk_sectors < (PAGE_SIZE >> 9) ||
!is_power_of_2(mddev->chunk_sectors)) {
- printk(KERN_ERR "md/raid10: chunk size must be "
- "at least PAGE_SIZE(%ld) and be a power of 2.\n", PAGE_SIZE);
- return -EINVAL;
+ printk(KERN_ERR "md/raid10:%s: chunk size must be "
+ "at least PAGE_SIZE(%ld) and be a power of 2.\n",
+ mdname(mddev), PAGE_SIZE);
+ goto out;
}
nc = mddev->layout & 255;
fc = (mddev->layout >> 8) & 255;
fo = mddev->layout & (1<<16);
+
if ((nc*fc) <2 || (nc*fc) > mddev->raid_disks ||
(mddev->layout >> 17)) {
- printk(KERN_ERR "raid10: %s: unsupported raid10 layout: 0x%8x\n",
+ printk(KERN_ERR "md/raid10:%s: unsupported raid10 layout: 0x%8x\n",
mdname(mddev), mddev->layout);
goto out;
}
- /*
- * copy the already verified devices into our private RAID10
- * bookkeeping area. [whatever we allocate in run(),
- * should be freed in stop()]
- */
+
+ err = -ENOMEM;
conf = kzalloc(sizeof(conf_t), GFP_KERNEL);
- mddev->private = conf;
- if (!conf) {
- printk(KERN_ERR "raid10: couldn't allocate memory for %s\n",
- mdname(mddev));
+ if (!conf)
goto out;
- }
+
conf->mirrors = kzalloc(sizeof(struct mirror_info)*mddev->raid_disks,
- GFP_KERNEL);
- if (!conf->mirrors) {
- printk(KERN_ERR "raid10: couldn't allocate memory for %s\n",
- mdname(mddev));
- goto out_free_conf;
- }
+ GFP_KERNEL);
+ if (!conf->mirrors)
+ goto out;
conf->tmppage = alloc_page(GFP_KERNEL);
if (!conf->tmppage)
- goto out_free_conf;
+ goto out;
+
conf->raid_disks = mddev->raid_disks;
conf->near_copies = nc;
conf->far_copies = fc;
conf->copies = nc*fc;
conf->far_offset = fo;
- conf->chunk_mask = mddev->chunk_sectors - 1;
- conf->chunk_shift = ffz(~mddev->chunk_sectors);
+ conf->chunk_mask = mddev->new_chunk_sectors - 1;
+ conf->chunk_shift = ffz(~mddev->new_chunk_sectors);
+
+ conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc,
+ r10bio_pool_free, conf);
+ if (!conf->r10bio_pool)
+ goto out;
+
size = mddev->dev_sectors >> conf->chunk_shift;
sector_div(size, fc);
size = size * conf->raid_disks;
@@ -2221,7 +2221,8 @@ static int run(mddev_t *mddev)
*/
stride += conf->raid_disks - 1;
sector_div(stride, conf->raid_disks);
- mddev->dev_sectors = stride << conf->chunk_shift;
+
+ conf->dev_sectors = stride << conf->chunk_shift;
if (fo)
stride = 1;
@@ -2229,18 +2230,63 @@ static int run(mddev_t *mddev)
sector_div(stride, fc);
conf->stride = stride << conf->chunk_shift;
- conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc,
- r10bio_pool_free, conf);
- if (!conf->r10bio_pool) {
- printk(KERN_ERR "raid10: couldn't allocate memory for %s\n",
- mdname(mddev));
- goto out_free_conf;
- }
- conf->mddev = mddev;
spin_lock_init(&conf->device_lock);
+ INIT_LIST_HEAD(&conf->retry_list);
+
+ spin_lock_init(&conf->resync_lock);
+ init_waitqueue_head(&conf->wait_barrier);
+
+ conf->thread = md_register_thread(raid10d, mddev, NULL);
+ if (!conf->thread)
+ goto out;
+
+ conf->scale_disks = 0;
+ conf->mddev = mddev;
+ return conf;
+
+ out:
+ printk(KERN_ERR "md/raid10:%s: couldn't allocate memory.\n",
+ mdname(mddev));
+ if (conf) {
+ if (conf->r10bio_pool)
+ mempool_destroy(conf->r10bio_pool);
+ kfree(conf->mirrors);
+ safe_put_page(conf->tmppage);
+ kfree(conf);
+ }
+ return ERR_PTR(err);
+}
+
+static int run(mddev_t *mddev)
+{
+ conf_t *conf;
+ int i, disk_idx, chunk_size;
+ mirror_info_t *disk;
+ mdk_rdev_t *rdev;
+ sector_t size;
+
+ /*
+ * copy the already verified devices into our private RAID10
+ * bookkeeping area. [whatever we allocate in run(),
+ * should be freed in stop()]
+ */
+
+ if (mddev->private == NULL) {
+ conf = setup_conf(mddev);
+ if (IS_ERR(conf))
+ return PTR_ERR(conf);
+ mddev->private = conf;
+ }
+ conf = mddev->private;
+ if (!conf)
+ goto out;
+
mddev->queue->queue_lock = &conf->device_lock;
+ mddev->thread = conf->thread;
+ conf->thread = NULL;
+
chunk_size = mddev->chunk_sectors << 9;
blk_queue_io_min(mddev->queue, chunk_size);
if (conf->raid_disks % conf->near_copies)
@@ -2251,9 +2297,14 @@ static int run(mddev_t *mddev)
list_for_each_entry(rdev, &mddev->disks, same_set) {
disk_idx = rdev->raid_disk;
- if (disk_idx >= mddev->raid_disks
+ if (disk_idx >= conf->raid_disks
|| disk_idx < 0)
continue;
+ if (conf->scale_disks) {
+ disk_idx *= conf->scale_disks;
+ rdev->raid_disk = disk_idx;
+ /* MOVE 'rd%d' link !! */
+ }
disk = conf->mirrors + disk_idx;
disk->rdev = rdev;
@@ -2271,14 +2322,9 @@ static int run(mddev_t *mddev)
disk->head_position = 0;
}
- INIT_LIST_HEAD(&conf->retry_list);
-
- spin_lock_init(&conf->resync_lock);
- init_waitqueue_head(&conf->wait_barrier);
-
/* need to check that every block has at least one working mirror */
if (!enough(conf)) {
- printk(KERN_ERR "raid10: not enough operational mirrors for %s\n",
+ printk(KERN_ERR "md/raid10:%s: not enough operational mirrors.\n",
mdname(mddev));
goto out_free_conf;
}
@@ -2297,28 +2343,21 @@ static int run(mddev_t *mddev)
}
}
-
- mddev->thread = md_register_thread(raid10d, mddev, NULL);
- if (!mddev->thread) {
- printk(KERN_ERR
- "raid10: couldn't allocate thread for %s\n",
- mdname(mddev));
- goto out_free_conf;
- }
-
if (mddev->recovery_cp != MaxSector)
- printk(KERN_NOTICE "raid10: %s is not clean"
+ printk(KERN_NOTICE "md/raid10:%s: not clean"
" -- starting background reconstruction\n",
mdname(mddev));
printk(KERN_INFO
- "raid10: raid set %s active with %d out of %d devices\n",
- mdname(mddev), mddev->raid_disks - mddev->degraded,
- mddev->raid_disks);
+ "md/raid10:%s: active with %d out of %d devices\n",
+ mdname(mddev), conf->raid_disks - mddev->degraded,
+ conf->raid_disks);
/*
* Ok, everything is just fine now
*/
- md_set_array_sectors(mddev, raid10_size(mddev, 0, 0));
- mddev->resync_max_sectors = raid10_size(mddev, 0, 0);
+ mddev->dev_sectors = conf->dev_sectors;
+ size = raid10_size(mddev, 0, 0);
+ md_set_array_sectors(mddev, size);
+ mddev->resync_max_sectors = size;
mddev->queue->unplug_fn = raid10_unplug;
mddev->queue->backing_dev_info.congested_fn = raid10_congested;
@@ -2336,7 +2375,7 @@ static int run(mddev_t *mddev)
mddev->queue->backing_dev_info.ra_pages = 2* stripe;
}
- if (conf->near_copies < mddev->raid_disks)
+ if (conf->near_copies < conf->raid_disks)
blk_queue_merge_bvec(mddev->queue, raid10_mergeable_bvec);
md_integrity_register(mddev);
return 0;
@@ -2348,6 +2387,7 @@ out_free_conf:
kfree(conf->mirrors);
kfree(conf);
mddev->private = NULL;
+ md_unregister_thread(mddev->thread);
out:
return -EIO;
}
@@ -2384,6 +2424,61 @@ static void raid10_quiesce(mddev_t *mddev, int state)
}
}
+static void *raid10_takeover_raid0(mddev_t *mddev)
+{
+ mdk_rdev_t *rdev;
+ conf_t *conf;
+
+ if (mddev->degraded > 0) {
+ printk(KERN_ERR "md/raid10:%s: Error: degraded raid0!\n",
+ mdname(mddev));
+ return ERR_PTR(-EINVAL);
+ }
+
+ /* Update slot numbers to obtain
+ * degraded raid10 with missing mirrors
+ */
+ list_for_each_entry(rdev, &mddev->disks, same_set) {
+ rdev->raid_disk *= 2;
+ }
+
+ /* Set new parameters */
+ mddev->new_level = 10;
+ /* new layout: far_copies = 1, near_copies = 2 */
+ mddev->new_layout = (1<<8) + 2;
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
+ mddev->delta_disks = mddev->raid_disks;
+ mddev->degraded = mddev->raid_disks;
+ mddev->raid_disks *= 2;
+ /* make sure it will be not marked as dirty */
+ mddev->recovery_cp = MaxSector;
+
+ conf = setup_conf(mddev);
+ conf->scale_disks = 2;
+ return conf;
+}
+
+static void *raid10_takeover(mddev_t *mddev)
+{
+ struct raid0_private_data *raid0_priv;
+
+ /* raid10 can take over:
+ * raid0 - providing it has only two drives
+ */
+ if (mddev->level == 0) {
+ /* for raid0 takeover only one zone is supported */
+ raid0_priv = mddev->private;
+ if (raid0_priv->nr_strip_zones > 1) {
+ printk(KERN_ERR "md/raid10:%s: cannot takeover raid 0"
+ " with more than one zone.\n",
+ mdname(mddev));
+ return ERR_PTR(-EINVAL);
+ }
+ return raid10_takeover_raid0(mddev);
+ }
+ return ERR_PTR(-EINVAL);
+}
+
static struct mdk_personality raid10_personality =
{
.name = "raid10",
@@ -2400,6 +2495,7 @@ static struct mdk_personality raid10_personality =
.sync_request = sync_request,
.quiesce = raid10_quiesce,
.size = raid10_size,
+ .takeover = raid10_takeover,
};
static int __init raid_init(void)
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