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md/raid5: prepare for allowing reshape to change layout 

Add prev_algo to raid5_conf_t along the same lines as prev_chunk
and previous_raid_disks.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-03-31 15:20:22 +11:00
parent 784052ecc6
commit e183eaedd5
2 changed files with 20 additions and 14 deletions
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32
drivers/md/raid5.c
View File

@ -1273,6 +1273,8 @@ static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector,
int pd_idx, qd_idx;
int ddf_layout = 0;
sector_t new_sector;
int algorithm = previous ? conf->prev_algo
: conf->algorithm;
int sectors_per_chunk = previous ? (conf->prev_chunk >> 9)
: (conf->chunk_size >> 9);
int raid_disks = previous ? conf->previous_raid_disks
@ -1307,7 +1309,7 @@ static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector,
pd_idx = data_disks;
break;
case 5:
switch (conf->algorithm) {
switch (algorithm) {
case ALGORITHM_LEFT_ASYMMETRIC:
pd_idx = data_disks - stripe % raid_disks;
if (*dd_idx >= pd_idx)
@ -1335,13 +1337,13 @@ static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector,
break;
default:
printk(KERN_ERR "raid5: unsupported algorithm %d\n",
conf->algorithm);
algorithm);
BUG();
}
break;
case 6:
switch (conf->algorithm) {
switch (algorithm) {
case ALGORITHM_LEFT_ASYMMETRIC:
pd_idx = raid_disks - 1 - (stripe % raid_disks);
qd_idx = pd_idx + 1;
@ -1454,7 +1456,7 @@ static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector,
default:
printk(KERN_CRIT "raid6: unsupported algorithm %d\n",
conf->algorithm);
algorithm);
BUG();
}
break;
@ -1481,6 +1483,8 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
sector_t new_sector = sh->sector, check;
int sectors_per_chunk = previous ? (conf->prev_chunk >> 9)
: (conf->chunk_size >> 9);
int algorithm = previous ? conf->prev_algo
: conf->algorithm;
sector_t stripe;
int chunk_offset;
int chunk_number, dummy1, dd_idx = i;
@ -1497,7 +1501,7 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
switch(conf->level) {
case 4: break;
case 5:
switch (conf->algorithm) {
switch (algorithm) {
case ALGORITHM_LEFT_ASYMMETRIC:
case ALGORITHM_RIGHT_ASYMMETRIC:
if (i > sh->pd_idx)
@ -1516,14 +1520,14 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
break;
default:
printk(KERN_ERR "raid5: unsupported algorithm %d\n",
conf->algorithm);
algorithm);
BUG();
}
break;
case 6:
if (i == sh->qd_idx)
return 0; /* It is the Q disk */
switch (conf->algorithm) {
switch (algorithm) {
case ALGORITHM_LEFT_ASYMMETRIC:
case ALGORITHM_RIGHT_ASYMMETRIC:
case ALGORITHM_ROTATING_ZERO_RESTART:
@ -1571,7 +1575,7 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i, int previous)
break;
default:
printk(KERN_CRIT "raid6: unsupported algorithm %d\n",
conf->algorithm);
algorithm);
BUG();
}
break;
@ -4330,8 +4334,10 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
conf->algorithm = mddev->new_layout;
conf->max_nr_stripes = NR_STRIPES;
conf->reshape_progress = mddev->reshape_position;
if (conf->reshape_progress != MaxSector)
if (conf->reshape_progress != MaxSector) {
conf->prev_chunk = mddev->chunk_size;
conf->prev_algo = mddev->layout;
}
memory = conf->max_nr_stripes * (sizeof(struct stripe_head) +
conf->raid_disks * ((sizeof(struct bio) + PAGE_SIZE))) / 1024;
@ -4472,14 +4478,14 @@ static int run(mddev_t *mddev)
if (mddev->degraded == 0)
printk("raid5: raid level %d set %s active with %d out of %d"
" devices, algorithm %d\n", conf->level, mdname(mddev),
mddev->raid_disks-mddev->degraded, mddev->raid_disks,
conf->algorithm);
" devices, algorithm %d\n", conf->level, mdname(mddev),
mddev->raid_disks-mddev->degraded, mddev->raid_disks,
mddev->new_layout);
else
printk(KERN_ALERT "raid5: raid level %d set %s active with %d"
" out of %d devices, algorithm %d\n", conf->level,
mdname(mddev), mddev->raid_disks - mddev->degraded,
mddev->raid_disks, conf->algorithm);
mddev->raid_disks, mddev->new_layout);
print_raid5_conf(conf);

2
drivers/md/raid5.h
View File

@ -350,7 +350,7 @@ struct raid5_private_data {
*/
sector_t reshape_safe;
int previous_raid_disks;
int prev_chunk;
int prev_chunk, prev_algo;
short generation; /* increments with every reshape */
struct list_head handle_list; /* stripes needing handling */