Rather than passing 'pd_idx' and 'disks' to these functions, just pass
'previous' which tells whether to use the 'previous' or 'current'
geometry during a reshape, and let init_stripe calculate
disks and pd_idx and anything else it might need.
This is not a substantial simplification and even adds a division.
However we will shortly be adding more complexity to to init_stripe
to handle more interesting 'reshape' activities, and without this
change, the interface to these functions would get very complex.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
drivers/md/raid5.c | 43 ++++++++++++++++++++++---------------------
1 files changed, 22 insertions(+), 21 deletions(-)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 99c5261..94ed206 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -271,8 +271,9 @@ 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 void init_stripe(struct stripe_head *sh, sector_t sector, int pd_idx, int disks)
+static void init_stripe(struct stripe_head *sh, sector_t sector, int previous)
{
raid5_conf_t *conf = sh->raid_conf;
int i;
@@ -287,11 +288,11 @@ static void init_stripe(struct stripe_head *sh, sector_t sector, int pd_idx, int
remove_hash(sh);
+ sh->disks = previous ? conf->previous_raid_disks : conf->raid_disks;
sh->sector = sector;
- sh->pd_idx = pd_idx;
+ sh->pd_idx = stripe_to_pdidx(sector, conf, sh->disks);
sh->state = 0;
- sh->disks = disks;
for (i = sh->disks; i--; ) {
struct r5dev *dev = &sh->dev[i];
@@ -327,10 +328,12 @@ static struct stripe_head *__find_stripe(raid5_conf_t *conf, sector_t sector, in
static void unplug_slaves(mddev_t *mddev);
static void raid5_unplug_device(struct request_queue *q);
-static struct stripe_head *get_active_stripe(raid5_conf_t *conf, sector_t sector, int disks,
- int pd_idx, int noblock)
+static struct stripe_head *
+get_active_stripe(raid5_conf_t *conf, sector_t sector,
+ int previous, int noblock)
{
struct stripe_head *sh;
+ int disks = previous ? conf->previous_raid_disks : conf->raid_disks;
pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector);
@@ -358,7 +361,7 @@ static struct stripe_head *get_active_stripe(raid5_conf_t *conf, sector_t sector
);
conf->inactive_blocked = 0;
} else
- init_stripe(sh, sector, pd_idx, disks);
+ init_stripe(sh, sector, previous);
} else {
if (atomic_read(&sh->count)) {
BUG_ON(!list_empty(&sh->lru));
@@ -2476,8 +2479,7 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh,
conf->raid_disks -
conf->max_degraded, &dd_idx,
&pd_idx, conf);
- sh2 = get_active_stripe(conf, s, conf->raid_disks,
- pd_idx, 1);
+ sh2 = get_active_stripe(conf, s, 0, 1);
if (sh2 == NULL)
/* so far only the early blocks of this stripe
* have been requested. When later blocks
@@ -3410,8 +3412,10 @@ static int make_request(struct request_queue *q, struct bio * bi)
for (;logical_sector < last_sector; logical_sector += STRIPE_SECTORS) {
DEFINE_WAIT(w);
int disks, data_disks;
+ int previous;
retry:
+ previous = 0;
prepare_to_wait(&conf->wait_for_overlap, &w, TASK_UNINTERRUPTIBLE);
if (likely(conf->expand_progress == MaxSector))
disks = conf->raid_disks;
@@ -3426,9 +3430,10 @@ static int make_request(struct request_queue *q, struct bio * bi)
*/
spin_lock_irq(&conf->device_lock);
disks = conf->raid_disks;
- if (logical_sector >= conf->expand_progress)
+ if (logical_sector >= conf->expand_progress) {
disks = conf->previous_raid_disks;
- else {
+ previous = 1;
+ } else {
if (logical_sector >= conf->expand_lo) {
spin_unlock_irq(&conf->device_lock);
schedule();
@@ -3445,7 +3450,8 @@ static int make_request(struct request_queue *q, struct bio * bi)
(unsigned long long)new_sector,
(unsigned long long)logical_sector);
- sh = get_active_stripe(conf, new_sector, disks, pd_idx, (bi->bi_rw&RWA_MASK));
+ sh = get_active_stripe(conf, new_sector, previous,
+ (bi->bi_rw&RWA_MASK));
if (sh) {
if (unlikely(conf->expand_progress != MaxSector)) {
/* expansion might have moved on while waiting for a
@@ -3579,9 +3585,7 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
for (i=0; i < conf->chunk_size/512; i+= STRIPE_SECTORS) {
int j;
int skipped = 0;
- pd_idx = stripe_to_pdidx(sector_nr+i, conf, conf->raid_disks);
- sh = get_active_stripe(conf, sector_nr+i,
- conf->raid_disks, pd_idx, 0);
+ sh = get_active_stripe(conf, sector_nr+i, 0, 0);
set_bit(STRIPE_EXPANDING, &sh->state);
atomic_inc(&conf->reshape_stripes);
/* If any of this stripe is beyond the end of the old
@@ -3629,10 +3633,7 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
if (last_sector >= mddev->dev_sectors)
last_sector = mddev->dev_sectors - 1;
while (first_sector <= last_sector) {
- pd_idx = stripe_to_pdidx(first_sector, conf,
- conf->previous_raid_disks);
- sh = get_active_stripe(conf, first_sector,
- conf->previous_raid_disks, pd_idx, 0);
+ sh = get_active_stripe(conf, first_sector, 1, 0);
set_bit(STRIPE_EXPAND_SOURCE, &sh->state);
set_bit(STRIPE_HANDLE, &sh->state);
release_stripe(sh);
@@ -3722,9 +3723,9 @@ 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, raid_disks, pd_idx, 1);
+ sh = get_active_stripe(conf, sector_nr, 0, 1);
if (sh == NULL) {
- sh = get_active_stripe(conf, sector_nr, raid_disks, pd_idx, 0);
+ sh = get_active_stripe(conf, sector_nr, 0, 0);
/* make sure we don't swamp the stripe cache if someone else
* is trying to get access
*/
@@ -3790,7 +3791,7 @@ static int retry_aligned_read(raid5_conf_t *conf, struct bio *raid_bio)
/* already done this stripe */
continue;
- sh = get_active_stripe(conf, sector, conf->raid_disks, pd_idx, 1);
+ sh = get_active_stripe(conf, sector, 0, 1);
if (!sh) {
/* failed to get a stripe - must wait */
--
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