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md/raid5: change raid5_compute_sector and stripe_to_pdidx to take a 'previous' argument 

This similar to the recent change to get_active_stripe.
There is no functional change, just come rearrangement to make
future patches cleaner.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-03-31 14:39:38 +11:00
parent b5663ba405
commit 112bf8970d
1 changed files with 34 additions and 44 deletions
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78
drivers/md/raid5.c
View File

@ -274,7 +274,7 @@ static int grow_buffers(struct stripe_head *sh, int num)
}
static void raid5_build_block(struct stripe_head *sh, int i);
static int stripe_to_pdidx(sector_t stripe, raid5_conf_t *conf, int disks);
static int stripe_to_pdidx(sector_t stripe, raid5_conf_t *conf, int previous);
static void init_stripe(struct stripe_head *sh, sector_t sector, int previous)
{
@ -293,7 +293,7 @@ static void init_stripe(struct stripe_head *sh, sector_t sector, int previous)
sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks;
sh->sector = sector;
sh->pd_idx = stripe_to_pdidx(sector, conf, sh->disks);
sh->pd_idx = stripe_to_pdidx(sector, conf, previous);
sh->state = 0;
@ -1233,15 +1233,18 @@ static void error(mddev_t *mddev, mdk_rdev_t *rdev)
* Input: a 'big' sector number,
* Output: index of the data and parity disk, and the sector # in them.
*/
static sector_t raid5_compute_sector(sector_t r_sector, unsigned int raid_disks,
unsigned int data_disks, unsigned int * dd_idx,
unsigned int * pd_idx, raid5_conf_t *conf)
static sector_t raid5_compute_sector(raid5_conf_t *conf, sector_t r_sector,
int previous,
int *dd_idx, int *pd_idx)
{
long stripe;
unsigned long chunk_number;
unsigned int chunk_offset;
sector_t new_sector;
int sectors_per_chunk = conf->chunk_size >> 9;
int raid_disks = previous ? conf->previous_raid_disks
: conf->raid_disks;
int data_disks = raid_disks - conf->max_degraded;
/* First compute the information on this sector */
@ -1406,7 +1409,9 @@ static sector_t compute_blocknr(struct stripe_head *sh, int i)
chunk_number = stripe * data_disks + i;
r_sector = (sector_t)chunk_number * sectors_per_chunk + chunk_offset;
check = raid5_compute_sector(r_sector, raid_disks, data_disks, &dummy1, &dummy2, conf);
check = raid5_compute_sector(conf, r_sector,
(raid_disks != conf->raid_disks),
&dummy1, &dummy2);
if (check != sh->sector || dummy1 != dd_idx || dummy2 != sh->pd_idx) {
printk(KERN_ERR "compute_blocknr: map not correct\n");
return 0;
@ -1806,16 +1811,18 @@ static int page_is_zero(struct page *p)
memcmp(a, a+4, STRIPE_SIZE-4)==0);
}
static int stripe_to_pdidx(sector_t stripe, raid5_conf_t *conf, int disks)
static int stripe_to_pdidx(sector_t stripe, raid5_conf_t *conf, int previous)
{
int sectors_per_chunk = conf->chunk_size >> 9;
int pd_idx, dd_idx;
int chunk_offset = sector_div(stripe, sectors_per_chunk);
int disks = previous ? conf->previous_raid_disks : conf->raid_disks;
raid5_compute_sector(stripe * (disks - conf->max_degraded)
raid5_compute_sector(conf,
stripe * (disks - conf->max_degraded)
*sectors_per_chunk + chunk_offset,
disks, disks - conf->max_degraded,
&dd_idx, &pd_idx, conf);
previous,
&dd_idx, &pd_idx);
return pd_idx;
}
@ -2478,10 +2485,8 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh,
struct stripe_head *sh2;
sector_t bn = compute_blocknr(sh, i);
sector_t s = raid5_compute_sector(bn, conf->raid_disks,
conf->raid_disks -
conf->max_degraded, &dd_idx,
&pd_idx, conf);
sector_t s = raid5_compute_sector(conf, bn, 0,
&dd_idx, &pd_idx);
sh2 = get_active_stripe(conf, s, 0, 1);
if (sh2 == NULL)
/* so far only the early blocks of this stripe
@ -2768,8 +2773,7 @@ static bool handle_stripe5(struct stripe_head *sh)
!sh->reconstruct_state) {
/* Need to write out all blocks after computing parity */
sh->disks = conf->raid_disks;
sh->pd_idx = stripe_to_pdidx(sh->sector, conf,
conf->raid_disks);
sh->pd_idx = stripe_to_pdidx(sh->sector, conf, 0);
schedule_reconstruction5(sh, &s, 1, 1);
} else if (s.expanded && !sh->reconstruct_state && s.locked == 0) {
clear_bit(STRIPE_EXPAND_READY, &sh->state);
@ -2987,8 +2991,7 @@ static bool handle_stripe6(struct stripe_head *sh, struct page *tmp_page)
if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state)) {
/* Need to write out all blocks after computing P&Q */
sh->disks = conf->raid_disks;
sh->pd_idx = stripe_to_pdidx(sh->sector, conf,
conf->raid_disks);
sh->pd_idx = stripe_to_pdidx(sh->sector, conf, 0);
compute_parity6(sh, RECONSTRUCT_WRITE);
for (i = conf->raid_disks ; i-- ; ) {
set_bit(R5_LOCKED, &sh->dev[i].flags);
@ -3260,8 +3263,6 @@ static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio)
{
mddev_t *mddev = q->queuedata;
raid5_conf_t *conf = mddev_to_conf(mddev);
const unsigned int raid_disks = conf->raid_disks;
const unsigned int data_disks = raid_disks - conf->max_degraded;
unsigned int dd_idx, pd_idx;
struct bio* align_bi;
mdk_rdev_t *rdev;
@ -3285,12 +3286,9 @@ static int chunk_aligned_read(struct request_queue *q, struct bio * raid_bio)
/*
* compute position
*/
align_bi->bi_sector = raid5_compute_sector(raid_bio->bi_sector,
raid_disks,
data_disks,
&dd_idx,
&pd_idx,
conf);
align_bi->bi_sector = raid5_compute_sector(conf, raid_bio->bi_sector,
0,
&dd_idx, &pd_idx);
rcu_read_lock();
rdev = rcu_dereference(conf->disks[dd_idx].rdev);
@ -3447,8 +3445,9 @@ static int make_request(struct request_queue *q, struct bio * bi)
}
data_disks = disks - conf->max_degraded;
new_sector = raid5_compute_sector(logical_sector, disks, data_disks,
&dd_idx, &pd_idx, conf);
new_sector = raid5_compute_sector(conf, logical_sector,
previous,
&dd_idx, &pd_idx);
pr_debug("raid5: make_request, sector %llu logical %llu\n",
(unsigned long long)new_sector,
(unsigned long long)logical_sector);
@ -3625,14 +3624,12 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
* block on the destination stripes.
*/
first_sector =
raid5_compute_sector(sector_nr*(new_data_disks),
raid_disks, data_disks,
&dd_idx, &pd_idx, conf);
raid5_compute_sector(conf, sector_nr*(new_data_disks),
1, &dd_idx, &pd_idx);
last_sector =
raid5_compute_sector((sector_nr+conf->chunk_size/512)
*(new_data_disks) -1,
raid_disks, data_disks,
&dd_idx, &pd_idx, conf);
raid5_compute_sector(conf, ((sector_nr+conf->chunk_size/512)
*(new_data_disks) - 1),
1, &dd_idx, &pd_idx);
if (last_sector >= mddev->dev_sectors)
last_sector = mddev->dev_sectors - 1;
while (first_sector <= last_sector) {
@ -3669,8 +3666,6 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski
{
raid5_conf_t *conf = (raid5_conf_t *) mddev->private;
struct stripe_head *sh;
int pd_idx;
int raid_disks = conf->raid_disks;
sector_t max_sector = mddev->dev_sectors;
int sync_blocks;
int still_degraded = 0;
@ -3725,7 +3720,6 @@ static inline sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *ski
bitmap_cond_end_sync(mddev->bitmap, sector_nr);
pd_idx = stripe_to_pdidx(sector_nr, conf, raid_disks);
sh = get_active_stripe(conf, sector_nr, 0, 1);
if (sh == NULL) {
sh = get_active_stripe(conf, sector_nr, 0, 0);
@ -3777,12 +3771,8 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio)
int handled = 0;
logical_sector = raid_bio->bi_sector & ~((sector_t)STRIPE_SECTORS-1);
sector = raid5_compute_sector( logical_sector,
conf->raid_disks,
conf->raid_disks - conf->max_degraded,
&dd_idx,
&pd_idx,
conf);
sector = raid5_compute_sector(conf, logical_sector,
0, &dd_idx, &pd_idx);
last_sector = raid_bio->bi_sector + (raid_bio->bi_size>>9);
for (; logical_sector < last_sector;