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path: root/drivers/md/raid0.c
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Diffstat (limited to 'drivers/md/raid0.c')
-rw-r--r--drivers/md/raid0.c251
1 files changed, 190 insertions, 61 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index c3bec024612..e70f004c99e 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -23,15 +23,17 @@
#include <linux/slab.h>
#include "md.h"
#include "raid0.h"
+#include "raid5.h"
static void raid0_unplug(struct request_queue *q)
{
mddev_t *mddev = q->queuedata;
raid0_conf_t *conf = mddev->private;
mdk_rdev_t **devlist = conf->devlist;
+ int raid_disks = conf->strip_zone[0].nb_dev;
int i;
- for (i=0; i<mddev->raid_disks; i++) {
+ for (i=0; i < raid_disks; i++) {
struct request_queue *r_queue = bdev_get_queue(devlist[i]->bdev);
blk_unplug(r_queue);
@@ -43,12 +45,13 @@ static int raid0_congested(void *data, int bits)
mddev_t *mddev = data;
raid0_conf_t *conf = mddev->private;
mdk_rdev_t **devlist = conf->devlist;
+ int raid_disks = conf->strip_zone[0].nb_dev;
int i, ret = 0;
if (mddev_congested(mddev, bits))
return 1;
- for (i = 0; i < mddev->raid_disks && !ret ; i++) {
+ for (i = 0; i < raid_disks && !ret ; i++) {
struct request_queue *q = bdev_get_queue(devlist[i]->bdev);
ret |= bdi_congested(&q->backing_dev_info, bits);
@@ -66,16 +69,17 @@ static void dump_zones(mddev_t *mddev)
sector_t zone_start = 0;
char b[BDEVNAME_SIZE];
raid0_conf_t *conf = mddev->private;
+ int raid_disks = conf->strip_zone[0].nb_dev;
printk(KERN_INFO "******* %s configuration *********\n",
mdname(mddev));
h = 0;
for (j = 0; j < conf->nr_strip_zones; j++) {
printk(KERN_INFO "zone%d=[", j);
for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
- printk("%s/",
- bdevname(conf->devlist[j*mddev->raid_disks
+ printk(KERN_CONT "%s/",
+ bdevname(conf->devlist[j*raid_disks
+ k]->bdev, b));
- printk("]\n");
+ printk(KERN_CONT "]\n");
zone_size = conf->strip_zone[j].zone_end - zone_start;
printk(KERN_INFO " zone offset=%llukb "
@@ -88,7 +92,7 @@ static void dump_zones(mddev_t *mddev)
printk(KERN_INFO "**********************************\n\n");
}
-static int create_strip_zones(mddev_t *mddev)
+static int create_strip_zones(mddev_t *mddev, raid0_conf_t **private_conf)
{
int i, c, err;
sector_t curr_zone_end, sectors;
@@ -101,8 +105,9 @@ static int create_strip_zones(mddev_t *mddev)
if (!conf)
return -ENOMEM;
list_for_each_entry(rdev1, &mddev->disks, same_set) {
- printk(KERN_INFO "raid0: looking at %s\n",
- bdevname(rdev1->bdev,b));
+ printk(KERN_INFO "md/raid0:%s: looking at %s\n",
+ mdname(mddev),
+ bdevname(rdev1->bdev, b));
c = 0;
/* round size to chunk_size */
@@ -111,14 +116,16 @@ static int create_strip_zones(mddev_t *mddev)
rdev1->sectors = sectors * mddev->chunk_sectors;
list_for_each_entry(rdev2, &mddev->disks, same_set) {
- printk(KERN_INFO "raid0: comparing %s(%llu)",
+ printk(KERN_INFO "md/raid0:%s: comparing %s(%llu)",
+ mdname(mddev),
bdevname(rdev1->bdev,b),
(unsigned long long)rdev1->sectors);
- printk(KERN_INFO " with %s(%llu)\n",
+ printk(KERN_CONT " with %s(%llu)\n",
bdevname(rdev2->bdev,b),
(unsigned long long)rdev2->sectors);
if (rdev2 == rdev1) {
- printk(KERN_INFO "raid0: END\n");
+ printk(KERN_INFO "md/raid0:%s: END\n",
+ mdname(mddev));
break;
}
if (rdev2->sectors == rdev1->sectors) {
@@ -126,20 +133,24 @@ static int create_strip_zones(mddev_t *mddev)
* Not unique, don't count it as a new
* group
*/
- printk(KERN_INFO "raid0: EQUAL\n");
+ printk(KERN_INFO "md/raid0:%s: EQUAL\n",
+ mdname(mddev));
c = 1;
break;
}
- printk(KERN_INFO "raid0: NOT EQUAL\n");
+ printk(KERN_INFO "md/raid0:%s: NOT EQUAL\n",
+ mdname(mddev));
}
if (!c) {
- printk(KERN_INFO "raid0: ==> UNIQUE\n");
+ printk(KERN_INFO "md/raid0:%s: ==> UNIQUE\n",
+ mdname(mddev));
conf->nr_strip_zones++;
- printk(KERN_INFO "raid0: %d zones\n",
- conf->nr_strip_zones);
+ printk(KERN_INFO "md/raid0:%s: %d zones\n",
+ mdname(mddev), conf->nr_strip_zones);
}
}
- printk(KERN_INFO "raid0: FINAL %d zones\n", conf->nr_strip_zones);
+ printk(KERN_INFO "md/raid0:%s: FINAL %d zones\n",
+ mdname(mddev), conf->nr_strip_zones);
err = -ENOMEM;
conf->strip_zone = kzalloc(sizeof(struct strip_zone)*
conf->nr_strip_zones, GFP_KERNEL);
@@ -162,14 +173,18 @@ static int create_strip_zones(mddev_t *mddev)
list_for_each_entry(rdev1, &mddev->disks, same_set) {
int j = rdev1->raid_disk;
+ if (mddev->level == 10)
+ /* taking over a raid10-n2 array */
+ j /= 2;
+
if (j < 0 || j >= mddev->raid_disks) {
- printk(KERN_ERR "raid0: bad disk number %d - "
- "aborting!\n", j);
+ printk(KERN_ERR "md/raid0:%s: bad disk number %d - "
+ "aborting!\n", mdname(mddev), j);
goto abort;
}
if (dev[j]) {
- printk(KERN_ERR "raid0: multiple devices for %d - "
- "aborting!\n", j);
+ printk(KERN_ERR "md/raid0:%s: multiple devices for %d - "
+ "aborting!\n", mdname(mddev), j);
goto abort;
}
dev[j] = rdev1;
@@ -191,8 +206,8 @@ static int create_strip_zones(mddev_t *mddev)
cnt++;
}
if (cnt != mddev->raid_disks) {
- printk(KERN_ERR "raid0: too few disks (%d of %d) - "
- "aborting!\n", cnt, mddev->raid_disks);
+ printk(KERN_ERR "md/raid0:%s: too few disks (%d of %d) - "
+ "aborting!\n", mdname(mddev), cnt, mddev->raid_disks);
goto abort;
}
zone->nb_dev = cnt;
@@ -208,39 +223,44 @@ static int create_strip_zones(mddev_t *mddev)
zone = conf->strip_zone + i;
dev = conf->devlist + i * mddev->raid_disks;
- printk(KERN_INFO "raid0: zone %d\n", i);
+ printk(KERN_INFO "md/raid0:%s: zone %d\n",
+ mdname(mddev), i);
zone->dev_start = smallest->sectors;
smallest = NULL;
c = 0;
for (j=0; j<cnt; j++) {
rdev = conf->devlist[j];
- printk(KERN_INFO "raid0: checking %s ...",
- bdevname(rdev->bdev, b));
+ printk(KERN_INFO "md/raid0:%s: checking %s ...",
+ mdname(mddev),
+ bdevname(rdev->bdev, b));
if (rdev->sectors <= zone->dev_start) {
- printk(KERN_INFO " nope.\n");
+ printk(KERN_CONT " nope.\n");
continue;
}
- printk(KERN_INFO " contained as device %d\n", c);
+ printk(KERN_CONT " contained as device %d\n", c);
dev[c] = rdev;
c++;
if (!smallest || rdev->sectors < smallest->sectors) {
smallest = rdev;
- printk(KERN_INFO " (%llu) is smallest!.\n",
- (unsigned long long)rdev->sectors);
+ printk(KERN_INFO "md/raid0:%s: (%llu) is smallest!.\n",
+ mdname(mddev),
+ (unsigned long long)rdev->sectors);
}
}
zone->nb_dev = c;
sectors = (smallest->sectors - zone->dev_start) * c;
- printk(KERN_INFO "raid0: zone->nb_dev: %d, sectors: %llu\n",
- zone->nb_dev, (unsigned long long)sectors);
+ printk(KERN_INFO "md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n",
+ mdname(mddev),
+ zone->nb_dev, (unsigned long long)sectors);
curr_zone_end += sectors;
zone->zone_end = curr_zone_end;
- printk(KERN_INFO "raid0: current zone start: %llu\n",
- (unsigned long long)smallest->sectors);
+ printk(KERN_INFO "md/raid0:%s: current zone start: %llu\n",
+ mdname(mddev),
+ (unsigned long long)smallest->sectors);
}
mddev->queue->unplug_fn = raid0_unplug;
mddev->queue->backing_dev_info.congested_fn = raid0_congested;
@@ -251,7 +271,7 @@ static int create_strip_zones(mddev_t *mddev)
* chunk size is a multiple of that sector size
*/
if ((mddev->chunk_sectors << 9) % queue_logical_block_size(mddev->queue)) {
- printk(KERN_ERR "%s chunk_size of %d not valid\n",
+ printk(KERN_ERR "md/raid0:%s: chunk_size of %d not valid\n",
mdname(mddev),
mddev->chunk_sectors << 9);
goto abort;
@@ -261,14 +281,15 @@ static int create_strip_zones(mddev_t *mddev)
blk_queue_io_opt(mddev->queue,
(mddev->chunk_sectors << 9) * mddev->raid_disks);
- printk(KERN_INFO "raid0: done.\n");
- mddev->private = conf;
+ printk(KERN_INFO "md/raid0:%s: done.\n", mdname(mddev));
+ *private_conf = conf;
+
return 0;
abort:
kfree(conf->strip_zone);
kfree(conf->devlist);
kfree(conf);
- mddev->private = NULL;
+ *private_conf = NULL;
return err;
}
@@ -319,10 +340,12 @@ static sector_t raid0_size(mddev_t *mddev, sector_t sectors, int raid_disks)
static int raid0_run(mddev_t *mddev)
{
+ raid0_conf_t *conf;
int ret;
if (mddev->chunk_sectors == 0) {
- printk(KERN_ERR "md/raid0: chunk size must be set.\n");
+ printk(KERN_ERR "md/raid0:%s: chunk size must be set.\n",
+ mdname(mddev));
return -EINVAL;
}
if (md_check_no_bitmap(mddev))
@@ -330,15 +353,27 @@ static int raid0_run(mddev_t *mddev)
blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
mddev->queue->queue_lock = &mddev->queue->__queue_lock;
- ret = create_strip_zones(mddev);
- if (ret < 0)
- return ret;
+ /* if private is not null, we are here after takeover */
+ if (mddev->private == NULL) {
+ ret = create_strip_zones(mddev, &conf);
+ if (ret < 0)
+ return ret;
+ mddev->private = conf;
+ }
+ conf = mddev->private;
+ if (conf->scale_raid_disks) {
+ int i;
+ for (i=0; i < conf->strip_zone[0].nb_dev; i++)
+ conf->devlist[i]->raid_disk /= conf->scale_raid_disks;
+ /* FIXME update sysfs rd links */
+ }
/* calculate array device size */
md_set_array_sectors(mddev, raid0_size(mddev, 0, 0));
- printk(KERN_INFO "raid0 : md_size is %llu sectors.\n",
- (unsigned long long)mddev->array_sectors);
+ printk(KERN_INFO "md/raid0:%s: md_size is %llu sectors.\n",
+ mdname(mddev),
+ (unsigned long long)mddev->array_sectors);
/* calculate the max read-ahead size.
* For read-ahead of large files to be effective, we need to
* readahead at least twice a whole stripe. i.e. number of devices
@@ -402,6 +437,7 @@ static mdk_rdev_t *map_sector(mddev_t *mddev, struct strip_zone *zone,
unsigned int sect_in_chunk;
sector_t chunk;
raid0_conf_t *conf = mddev->private;
+ int raid_disks = conf->strip_zone[0].nb_dev;
unsigned int chunk_sects = mddev->chunk_sectors;
if (is_power_of_2(chunk_sects)) {
@@ -424,7 +460,7 @@ static mdk_rdev_t *map_sector(mddev_t *mddev, struct strip_zone *zone,
* + the position in the chunk
*/
*sector_offset = (chunk * chunk_sects) + sect_in_chunk;
- return conf->devlist[(zone - conf->strip_zone)*mddev->raid_disks
+ return conf->devlist[(zone - conf->strip_zone)*raid_disks
+ sector_div(sector, zone->nb_dev)];
}
@@ -444,27 +480,18 @@ static inline int is_io_in_chunk_boundary(mddev_t *mddev,
}
}
-static int raid0_make_request(struct request_queue *q, struct bio *bio)
+static int raid0_make_request(mddev_t *mddev, struct bio *bio)
{
- mddev_t *mddev = q->queuedata;
unsigned int chunk_sects;
sector_t sector_offset;
struct strip_zone *zone;
mdk_rdev_t *tmp_dev;
- const int rw = bio_data_dir(bio);
- int cpu;
if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER))) {
md_barrier_request(mddev, bio);
return 0;
}
- 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();
-
chunk_sects = mddev->chunk_sectors;
if (unlikely(!is_io_in_chunk_boundary(mddev, chunk_sects, bio))) {
sector_t sector = bio->bi_sector;
@@ -482,9 +509,9 @@ static int raid0_make_request(struct request_queue *q, struct bio *bio)
else
bp = bio_split(bio, chunk_sects -
sector_div(sector, chunk_sects));
- if (raid0_make_request(q, &bp->bio1))
+ if (raid0_make_request(mddev, &bp->bio1))
generic_make_request(&bp->bio1);
- if (raid0_make_request(q, &bp->bio2))
+ if (raid0_make_request(mddev, &bp->bio2))
generic_make_request(&bp->bio2);
bio_pair_release(bp);
@@ -504,9 +531,10 @@ static int raid0_make_request(struct request_queue *q, struct bio *bio)
return 1;
bad_map:
- printk("raid0_make_request bug: can't convert block across chunks"
- " or bigger than %dk %llu %d\n", chunk_sects / 2,
- (unsigned long long)bio->bi_sector, bio->bi_size >> 10);
+ printk("md/raid0:%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);
return 0;
@@ -519,6 +547,7 @@ static void raid0_status(struct seq_file *seq, mddev_t *mddev)
int j, k, h;
char b[BDEVNAME_SIZE];
raid0_conf_t *conf = mddev->private;
+ int raid_disks = conf->strip_zone[0].nb_dev;
sector_t zone_size;
sector_t zone_start = 0;
@@ -529,7 +558,7 @@ static void raid0_status(struct seq_file *seq, mddev_t *mddev)
seq_printf(seq, "=[");
for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
seq_printf(seq, "%s/", bdevname(
- conf->devlist[j*mddev->raid_disks + k]
+ conf->devlist[j*raid_disks + k]
->bdev, b));
zone_size = conf->strip_zone[j].zone_end - zone_start;
@@ -544,6 +573,104 @@ static void raid0_status(struct seq_file *seq, mddev_t *mddev)
return;
}
+static void *raid0_takeover_raid5(mddev_t *mddev)
+{
+ mdk_rdev_t *rdev;
+ raid0_conf_t *priv_conf;
+
+ if (mddev->degraded != 1) {
+ printk(KERN_ERR "md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n",
+ mdname(mddev),
+ mddev->degraded);
+ return ERR_PTR(-EINVAL);
+ }
+
+ list_for_each_entry(rdev, &mddev->disks, same_set) {
+ /* check slot number for a disk */
+ if (rdev->raid_disk == mddev->raid_disks-1) {
+ printk(KERN_ERR "md/raid0:%s: raid5 must have missing parity disk!\n",
+ mdname(mddev));
+ return ERR_PTR(-EINVAL);
+ }
+ }
+
+ /* Set new parameters */
+ mddev->new_level = 0;
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
+ mddev->raid_disks--;
+ mddev->delta_disks = -1;
+ /* make sure it will be not marked as dirty */
+ mddev->recovery_cp = MaxSector;
+
+ create_strip_zones(mddev, &priv_conf);
+ return priv_conf;
+}
+
+static void *raid0_takeover_raid10(mddev_t *mddev)
+{
+ raid0_conf_t *priv_conf;
+
+ /* Check layout:
+ * - far_copies must be 1
+ * - near_copies must be 2
+ * - disks number must be even
+ * - all mirrors must be already degraded
+ */
+ if (mddev->layout != ((1 << 8) + 2)) {
+ printk(KERN_ERR "md/raid0:%s:: Raid0 cannot takover layout: 0x%x\n",
+ mdname(mddev),
+ mddev->layout);
+ return ERR_PTR(-EINVAL);
+ }
+ if (mddev->raid_disks & 1) {
+ printk(KERN_ERR "md/raid0:%s: Raid0 cannot takover Raid10 with odd disk number.\n",
+ mdname(mddev));
+ return ERR_PTR(-EINVAL);
+ }
+ if (mddev->degraded != (mddev->raid_disks>>1)) {
+ printk(KERN_ERR "md/raid0:%s: All mirrors must be already degraded!\n",
+ mdname(mddev));
+ return ERR_PTR(-EINVAL);
+ }
+
+ /* Set new parameters */
+ mddev->new_level = 0;
+ mddev->new_chunk_sectors = mddev->chunk_sectors;
+ mddev->delta_disks = - mddev->raid_disks / 2;
+ mddev->raid_disks += mddev->delta_disks;
+ mddev->degraded = 0;
+ /* make sure it will be not marked as dirty */
+ mddev->recovery_cp = MaxSector;
+
+ create_strip_zones(mddev, &priv_conf);
+ priv_conf->scale_raid_disks = 2;
+ return priv_conf;
+}
+
+static void *raid0_takeover(mddev_t *mddev)
+{
+ /* raid0 can take over:
+ * raid5 - providing it is Raid4 layout and one disk is faulty
+ * raid10 - assuming we have all necessary active disks
+ */
+ if (mddev->level == 5) {
+ if (mddev->layout == ALGORITHM_PARITY_N)
+ return raid0_takeover_raid5(mddev);
+
+ printk(KERN_ERR "md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n",
+ mdname(mddev), ALGORITHM_PARITY_N);
+ }
+
+ if (mddev->level == 10)
+ return raid0_takeover_raid10(mddev);
+
+ return ERR_PTR(-EINVAL);
+}
+
+static void raid0_quiesce(mddev_t *mddev, int state)
+{
+}
+
static struct mdk_personality raid0_personality=
{
.name = "raid0",
@@ -554,6 +681,8 @@ static struct mdk_personality raid0_personality=
.stop = raid0_stop,
.status = raid0_status,
.size = raid0_size,
+ .takeover = raid0_takeover,
+ .quiesce = raid0_quiesce,
};
static int __init raid0_init (void)
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-16 19:28:16 +0000