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md: raid0: remove ->dev pointer from strip_zone structure 

If we treat conf->devlist more like a 2 dimensional array,
we can get the devlist for a particular zone simply by indexing
that array, so we don't need to store the pointers to subarrays
in strip_zone.  This makes strip_zone smaller and so (hopefully)
searches faster.

Signed-of-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-06-16 16:50:52 +10:00
parent 49f357a22b
commit b414579f45
2 changed files with 11 additions and 11 deletions
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21
drivers/md/raid0.c
View File

@ -27,7 +27,7 @@ static void raid0_unplug(struct request_queue *q)
{
mddev_t *mddev = q->queuedata;
raid0_conf_t *conf = mddev_to_conf(mddev);
mdk_rdev_t **devlist = conf->strip_zone[0].dev;
mdk_rdev_t **devlist = conf->devlist;
int i;
for (i=0; i<mddev->raid_disks; i++) {
@ -41,7 +41,7 @@ static int raid0_congested(void *data, int bits)
{
mddev_t *mddev = data;
raid0_conf_t *conf = mddev_to_conf(mddev);
mdk_rdev_t **devlist = conf->strip_zone[0].dev;
mdk_rdev_t **devlist = conf->devlist;
int i, ret = 0;
for (i = 0; i < mddev->raid_disks && !ret ; i++) {
@ -56,7 +56,7 @@ static int create_strip_zones(mddev_t *mddev)
{
int i, c, j, err;
sector_t curr_zone_end, sectors;
mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev;
mdk_rdev_t *smallest, *rdev1, *rdev2, *rdev, **dev;
struct strip_zone *zone;
int cnt;
char b[BDEVNAME_SIZE];
@ -115,7 +115,7 @@ static int create_strip_zones(mddev_t *mddev)
zone = &conf->strip_zone[0];
cnt = 0;
smallest = NULL;
zone->dev = conf->devlist;
dev = conf->devlist;
err = -EINVAL;
list_for_each_entry(rdev1, &mddev->disks, same_set) {
int j = rdev1->raid_disk;
@ -125,12 +125,12 @@ static int create_strip_zones(mddev_t *mddev)
"aborting!\n", j);
goto abort;
}
if (zone->dev[j]) {
if (dev[j]) {
printk(KERN_ERR "raid0: multiple devices for %d - "
"aborting!\n", j);
goto abort;
}
zone->dev[j] = rdev1;
dev[j] = rdev1;
blk_queue_stack_limits(mddev->queue,
rdev1->bdev->bd_disk->queue);
@ -161,7 +161,7 @@ static int create_strip_zones(mddev_t *mddev)
for (i = 1; i < conf->nr_strip_zones; i++)
{
zone = conf->strip_zone + i;
zone->dev = conf->strip_zone[i-1].dev + mddev->raid_disks;
dev = conf->devlist + i * mddev->raid_disks;
printk(KERN_INFO "raid0: zone %d\n", i);
zone->dev_start = smallest->sectors;
@ -170,7 +170,7 @@ static int create_strip_zones(mddev_t *mddev)
for (j=0; j<cnt; j++) {
char b[BDEVNAME_SIZE];
rdev = conf->strip_zone[0].dev[j];
rdev = conf->devlist[j];
printk(KERN_INFO "raid0: checking %s ...",
bdevname(rdev->bdev, b));
if (rdev->sectors <= zone->dev_start) {
@ -178,7 +178,7 @@ static int create_strip_zones(mddev_t *mddev)
continue;
}
printk(KERN_INFO " contained as device %d\n", c);
zone->dev[c] = rdev;
dev[c] = rdev;
c++;
if (!smallest || rdev->sectors < smallest->sectors) {
smallest = rdev;
@ -383,7 +383,8 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
chunk = x;
x = sector >> chunksect_bits;
tmp_dev = zone->dev[sector_div(x, zone->nb_dev)];
tmp_dev = conf->devlist[(zone - conf->strip_zone)*mddev->raid_disks
+ sector_div(x, zone->nb_dev)];
}
rsect = (chunk << chunksect_bits) + zone->dev_start + sect_in_chunk;

1
drivers/md/raid0.h
View File

@ -6,7 +6,6 @@ struct strip_zone
sector_t zone_end; /* Start of the next zone (in sectors) */
sector_t dev_start; /* Zone offset in real dev (in sectors) */
int nb_dev; /* # of devices attached to the zone */
mdk_rdev_t **dev; /* Devices attached to the zone */
};
struct raid0_private_data