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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.c178
1 files changed, 88 insertions, 90 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 8ac6488ad0dc..c605ba805586 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -53,11 +53,10 @@ static int raid0_congested(void *data, int bits)
static int create_strip_zones (mddev_t *mddev)
{
int i, c, j;
- sector_t current_offset, curr_zone_offset;
+ sector_t current_start, curr_zone_start;
sector_t min_spacing;
raid0_conf_t *conf = mddev_to_conf(mddev);
mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev;
- struct list_head *tmp1, *tmp2;
struct strip_zone *zone;
int cnt;
char b[BDEVNAME_SIZE];
@@ -67,19 +66,19 @@ static int create_strip_zones (mddev_t *mddev)
*/
conf->nr_strip_zones = 0;
- rdev_for_each(rdev1, tmp1, mddev) {
- printk("raid0: looking at %s\n",
+ list_for_each_entry(rdev1, &mddev->disks, same_set) {
+ printk(KERN_INFO "raid0: looking at %s\n",
bdevname(rdev1->bdev,b));
c = 0;
- rdev_for_each(rdev2, tmp2, mddev) {
- printk("raid0: comparing %s(%llu)",
+ list_for_each_entry(rdev2, &mddev->disks, same_set) {
+ printk(KERN_INFO "raid0: comparing %s(%llu)",
bdevname(rdev1->bdev,b),
(unsigned long long)rdev1->size);
- printk(" with %s(%llu)\n",
+ printk(KERN_INFO " with %s(%llu)\n",
bdevname(rdev2->bdev,b),
(unsigned long long)rdev2->size);
if (rdev2 == rdev1) {
- printk("raid0: END\n");
+ printk(KERN_INFO "raid0: END\n");
break;
}
if (rdev2->size == rdev1->size)
@@ -88,19 +87,20 @@ static int create_strip_zones (mddev_t *mddev)
* Not unique, don't count it as a new
* group
*/
- printk("raid0: EQUAL\n");
+ printk(KERN_INFO "raid0: EQUAL\n");
c = 1;
break;
}
- printk("raid0: NOT EQUAL\n");
+ printk(KERN_INFO "raid0: NOT EQUAL\n");
}
if (!c) {
- printk("raid0: ==> UNIQUE\n");
+ printk(KERN_INFO "raid0: ==> UNIQUE\n");
conf->nr_strip_zones++;
- printk("raid0: %d zones\n", conf->nr_strip_zones);
+ printk(KERN_INFO "raid0: %d zones\n",
+ conf->nr_strip_zones);
}
}
- printk("raid0: FINAL %d zones\n", conf->nr_strip_zones);
+ printk(KERN_INFO "raid0: FINAL %d zones\n", conf->nr_strip_zones);
conf->strip_zone = kzalloc(sizeof(struct strip_zone)*
conf->nr_strip_zones, GFP_KERNEL);
@@ -119,16 +119,17 @@ static int create_strip_zones (mddev_t *mddev)
cnt = 0;
smallest = NULL;
zone->dev = conf->devlist;
- rdev_for_each(rdev1, tmp1, mddev) {
+ list_for_each_entry(rdev1, &mddev->disks, same_set) {
int j = rdev1->raid_disk;
if (j < 0 || j >= mddev->raid_disks) {
- printk("raid0: bad disk number %d - aborting!\n", j);
+ printk(KERN_ERR "raid0: bad disk number %d - "
+ "aborting!\n", j);
goto abort;
}
if (zone->dev[j]) {
- printk("raid0: multiple devices for %d - aborting!\n",
- j);
+ printk(KERN_ERR "raid0: multiple devices for %d - "
+ "aborting!\n", j);
goto abort;
}
zone->dev[j] = rdev1;
@@ -149,16 +150,16 @@ static int create_strip_zones (mddev_t *mddev)
cnt++;
}
if (cnt != mddev->raid_disks) {
- printk("raid0: too few disks (%d of %d) - aborting!\n",
- cnt, mddev->raid_disks);
+ printk(KERN_ERR "raid0: too few disks (%d of %d) - "
+ "aborting!\n", cnt, mddev->raid_disks);
goto abort;
}
zone->nb_dev = cnt;
- zone->size = smallest->size * cnt;
- zone->zone_offset = 0;
+ zone->sectors = smallest->size * cnt * 2;
+ zone->zone_start = 0;
- current_offset = smallest->size;
- curr_zone_offset = zone->size;
+ current_start = smallest->size * 2;
+ curr_zone_start = zone->sectors;
/* now do the other zones */
for (i = 1; i < conf->nr_strip_zones; i++)
@@ -166,40 +167,41 @@ static int create_strip_zones (mddev_t *mddev)
zone = conf->strip_zone + i;
zone->dev = conf->strip_zone[i-1].dev + mddev->raid_disks;
- printk("raid0: zone %d\n", i);
- zone->dev_offset = current_offset;
+ printk(KERN_INFO "raid0: zone %d\n", i);
+ zone->dev_start = current_start;
smallest = NULL;
c = 0;
for (j=0; j<cnt; j++) {
char b[BDEVNAME_SIZE];
rdev = conf->strip_zone[0].dev[j];
- printk("raid0: checking %s ...", bdevname(rdev->bdev,b));
- if (rdev->size > current_offset)
- {
- printk(" contained as device %d\n", c);
+ printk(KERN_INFO "raid0: checking %s ...",
+ bdevname(rdev->bdev, b));
+ if (rdev->size > current_start / 2) {
+ printk(KERN_INFO " contained as device %d\n",
+ c);
zone->dev[c] = rdev;
c++;
if (!smallest || (rdev->size <smallest->size)) {
smallest = rdev;
- printk(" (%llu) is smallest!.\n",
+ printk(KERN_INFO " (%llu) is smallest!.\n",
(unsigned long long)rdev->size);
}
} else
- printk(" nope.\n");
+ printk(KERN_INFO " nope.\n");
}
zone->nb_dev = c;
- zone->size = (smallest->size - current_offset) * c;
- printk("raid0: zone->nb_dev: %d, size: %llu\n",
- zone->nb_dev, (unsigned long long)zone->size);
+ zone->sectors = (smallest->size * 2 - current_start) * c;
+ printk(KERN_INFO "raid0: zone->nb_dev: %d, sectors: %llu\n",
+ zone->nb_dev, (unsigned long long)zone->sectors);
- zone->zone_offset = curr_zone_offset;
- curr_zone_offset += zone->size;
+ zone->zone_start = curr_zone_start;
+ curr_zone_start += zone->sectors;
- current_offset = smallest->size;
- printk("raid0: current zone offset: %llu\n",
- (unsigned long long)current_offset);
+ current_start = smallest->size * 2;
+ printk(KERN_INFO "raid0: current zone start: %llu\n",
+ (unsigned long long)current_start);
}
/* Now find appropriate hash spacing.
@@ -210,16 +212,16 @@ static int create_strip_zones (mddev_t *mddev)
* strip though as it's size has no bearing on the efficacy of the hash
* table.
*/
- conf->hash_spacing = curr_zone_offset;
- min_spacing = curr_zone_offset;
+ conf->spacing = curr_zone_start;
+ min_spacing = curr_zone_start;
sector_div(min_spacing, PAGE_SIZE/sizeof(struct strip_zone*));
for (i=0; i < conf->nr_strip_zones-1; i++) {
- sector_t sz = 0;
- for (j=i; j<conf->nr_strip_zones-1 &&
- sz < min_spacing ; j++)
- sz += conf->strip_zone[j].size;
- if (sz >= min_spacing && sz < conf->hash_spacing)
- conf->hash_spacing = sz;
+ sector_t s = 0;
+ for (j = i; j < conf->nr_strip_zones - 1 &&
+ s < min_spacing; j++)
+ s += conf->strip_zone[j].sectors;
+ if (s >= min_spacing && s < conf->spacing)
+ conf->spacing = s;
}
mddev->queue->unplug_fn = raid0_unplug;
@@ -227,7 +229,7 @@ static int create_strip_zones (mddev_t *mddev)
mddev->queue->backing_dev_info.congested_fn = raid0_congested;
mddev->queue->backing_dev_info.congested_data = mddev;
- printk("raid0: done.\n");
+ printk(KERN_INFO "raid0: done.\n");
return 0;
abort:
return 1;
@@ -262,10 +264,9 @@ static int raid0_mergeable_bvec(struct request_queue *q,
static int raid0_run (mddev_t *mddev)
{
unsigned cur=0, i=0, nb_zone;
- s64 size;
+ s64 sectors;
raid0_conf_t *conf;
mdk_rdev_t *rdev;
- struct list_head *tmp;
if (mddev->chunk_size == 0) {
printk(KERN_ERR "md/raid0: non-zero chunk size required.\n");
@@ -291,54 +292,54 @@ static int raid0_run (mddev_t *mddev)
/* calculate array device size */
mddev->array_sectors = 0;
- rdev_for_each(rdev, tmp, mddev)
+ list_for_each_entry(rdev, &mddev->disks, same_set)
mddev->array_sectors += rdev->size * 2;
- printk("raid0 : md_size is %llu blocks.\n",
- (unsigned long long)mddev->array_sectors / 2);
- printk("raid0 : conf->hash_spacing is %llu blocks.\n",
- (unsigned long long)conf->hash_spacing);
+ printk(KERN_INFO "raid0 : md_size is %llu sectors.\n",
+ (unsigned long long)mddev->array_sectors);
+ printk(KERN_INFO "raid0 : conf->spacing is %llu sectors.\n",
+ (unsigned long long)conf->spacing);
{
- sector_t s = mddev->array_sectors / 2;
- sector_t space = conf->hash_spacing;
+ sector_t s = mddev->array_sectors;
+ sector_t space = conf->spacing;
int round;
- conf->preshift = 0;
+ conf->sector_shift = 0;
if (sizeof(sector_t) > sizeof(u32)) {
/*shift down space and s so that sector_div will work */
while (space > (sector_t) (~(u32)0)) {
s >>= 1;
space >>= 1;
s += 1; /* force round-up */
- conf->preshift++;
+ conf->sector_shift++;
}
}
round = sector_div(s, (u32)space) ? 1 : 0;
nb_zone = s + round;
}
- printk("raid0 : nb_zone is %d.\n", nb_zone);
+ printk(KERN_INFO "raid0 : nb_zone is %d.\n", nb_zone);
- printk("raid0 : Allocating %Zd bytes for hash.\n",
+ printk(KERN_INFO "raid0 : Allocating %zu bytes for hash.\n",
nb_zone*sizeof(struct strip_zone*));
conf->hash_table = kmalloc (sizeof (struct strip_zone *)*nb_zone, GFP_KERNEL);
if (!conf->hash_table)
goto out_free_conf;
- size = conf->strip_zone[cur].size;
+ sectors = conf->strip_zone[cur].sectors;
conf->hash_table[0] = conf->strip_zone + cur;
for (i=1; i< nb_zone; i++) {
- while (size <= conf->hash_spacing) {
+ while (sectors <= conf->spacing) {
cur++;
- size += conf->strip_zone[cur].size;
+ sectors += conf->strip_zone[cur].sectors;
}
- size -= conf->hash_spacing;
+ sectors -= conf->spacing;
conf->hash_table[i] = conf->strip_zone + cur;
}
- if (conf->preshift) {
- conf->hash_spacing >>= conf->preshift;
- /* round hash_spacing up so when we divide by it, we
+ if (conf->sector_shift) {
+ conf->spacing >>= conf->sector_shift;
+ /* round spacing up so when we divide by it, we
* err on the side of too-low, which is safest
*/
- conf->hash_spacing++;
+ conf->spacing++;
}
/* calculate the max read-ahead size.
@@ -387,12 +388,12 @@ static int raid0_stop (mddev_t *mddev)
static int raid0_make_request (struct request_queue *q, struct bio *bio)
{
mddev_t *mddev = q->queuedata;
- unsigned int sect_in_chunk, chunksize_bits, chunk_size, chunk_sects;
+ unsigned int sect_in_chunk, chunksect_bits, chunk_sects;
raid0_conf_t *conf = mddev_to_conf(mddev);
struct strip_zone *zone;
mdk_rdev_t *tmp_dev;
sector_t chunk;
- sector_t block, rsect;
+ sector_t sector, rsect;
const int rw = bio_data_dir(bio);
int cpu;
@@ -407,11 +408,9 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
bio_sectors(bio));
part_stat_unlock();
- chunk_size = mddev->chunk_size >> 10;
chunk_sects = mddev->chunk_size >> 9;
- chunksize_bits = ffz(~chunk_size);
- block = bio->bi_sector >> 1;
-
+ chunksect_bits = ffz(~chunk_sects);
+ sector = bio->bi_sector;
if (unlikely(chunk_sects < (bio->bi_sector & (chunk_sects - 1)) + (bio->bi_size >> 9))) {
struct bio_pair *bp;
@@ -434,28 +433,27 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
{
- sector_t x = block >> conf->preshift;
- sector_div(x, (u32)conf->hash_spacing);
+ sector_t x = sector >> conf->sector_shift;
+ sector_div(x, (u32)conf->spacing);
zone = conf->hash_table[x];
}
-
- while (block >= (zone->zone_offset + zone->size))
+
+ while (sector >= zone->zone_start + zone->sectors)
zone++;
-
- sect_in_chunk = bio->bi_sector & ((chunk_size<<1) -1);
+
+ sect_in_chunk = bio->bi_sector & (chunk_sects - 1);
{
- sector_t x = (block - zone->zone_offset) >> chunksize_bits;
+ sector_t x = (sector - zone->zone_start) >> chunksect_bits;
sector_div(x, zone->nb_dev);
chunk = x;
- x = block >> chunksize_bits;
+ x = sector >> chunksect_bits;
tmp_dev = zone->dev[sector_div(x, zone->nb_dev)];
}
- rsect = (((chunk << chunksize_bits) + zone->dev_offset)<<1)
- + sect_in_chunk;
+ rsect = (chunk << chunksect_bits) + zone->dev_start + sect_in_chunk;
bio->bi_bdev = tmp_dev->bdev;
bio->bi_sector = rsect + tmp_dev->data_offset;
@@ -467,7 +465,7 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
bad_map:
printk("raid0_make_request bug: can't convert block across chunks"
- " or bigger than %dk %llu %d\n", chunk_size,
+ " or bigger than %dk %llu %d\n", chunk_sects / 2,
(unsigned long long)bio->bi_sector, bio->bi_size >> 10);
bio_io_error(bio);
@@ -492,10 +490,10 @@ static void raid0_status (struct seq_file *seq, mddev_t *mddev)
seq_printf(seq, "%s/", bdevname(
conf->strip_zone[j].dev[k]->bdev,b));
- seq_printf(seq, "] zo=%d do=%d s=%d\n",
- conf->strip_zone[j].zone_offset,
- conf->strip_zone[j].dev_offset,
- conf->strip_zone[j].size);
+ seq_printf(seq, "] zs=%d ds=%d s=%d\n",
+ conf->strip_zone[j].zone_start,
+ conf->strip_zone[j].dev_start,
+ conf->strip_zone[j].sectors);
}
#endif
seq_printf(seq, " %dk chunks", mddev->chunk_size/1024);
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-28 21:09:35 +0300