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md/raid5: finalise new merged handle_stripe. 

handle_stripe5() and handle_stripe6() are now virtually identical.
So discard one and rename the other to 'analyse_stripe()'.

It always returns 0, so change it to 'void' and remove the 'done'
variable in handle_stripe().

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>
This commit is contained in:
NeilBrown 2011-07-27 11:00:36 +10:00
parent 474af965fe
commit acfe726bdd
1 changed files with 13 additions and 102 deletions
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115
drivers/md/raid5.c
View File

@ -2898,100 +2898,27 @@ static void handle_stripe_expansion(raid5_conf_t *conf, struct stripe_head *sh)
*
*/
static int handle_stripe5(struct stripe_head *sh, struct stripe_head_state *s)
{
raid5_conf_t *conf = sh->raid_conf;
int disks = sh->disks, i;
struct r5dev *dev;
/* Now to look around and see what can be done */
rcu_read_lock();
spin_lock_irq(&conf->device_lock);
for (i=disks; i--; ) {
mdk_rdev_t *rdev;
dev = &sh->dev[i];
pr_debug("check %d: state 0x%lx toread %p read %p write %p "
"written %p\n", i, dev->flags, dev->toread, dev->read,
dev->towrite, dev->written);
/* maybe we can request a biofill operation
*
* new wantfill requests are only permitted while
* ops_complete_biofill is guaranteed to be inactive
*/
if (test_bit(R5_UPTODATE, &dev->flags) && dev->toread &&
!test_bit(STRIPE_BIOFILL_RUN, &sh->state))
set_bit(R5_Wantfill, &dev->flags);
/* now count some things */
if (test_bit(R5_LOCKED, &dev->flags))
s->locked++;
if (test_bit(R5_UPTODATE, &dev->flags))
s->uptodate++;
if (test_bit(R5_Wantcompute, &dev->flags))
s->compute++;
if (test_bit(R5_Wantfill, &dev->flags))
s->to_fill++;
else if (dev->toread)
s->to_read++;
if (dev->towrite) {
s->to_write++;
if (!test_bit(R5_OVERWRITE, &dev->flags))
s->non_overwrite++;
}
if (dev->written)
s->written++;
rdev = rcu_dereference(conf->disks[i].rdev);
if (s->blocked_rdev == NULL &&
rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
s->blocked_rdev = rdev;
atomic_inc(&rdev->nr_pending);
}
clear_bit(R5_Insync, &dev->flags);
if (!rdev)
/* Not in-sync */;
else if (test_bit(In_sync, &rdev->flags))
set_bit(R5_Insync, &dev->flags);
else {
/* could be in-sync depending on recovery/reshape status */
if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset)
set_bit(R5_Insync, &dev->flags);
}
if (!test_bit(R5_Insync, &dev->flags)) {
/* The ReadError flag will just be confusing now */
clear_bit(R5_ReadError, &dev->flags);
clear_bit(R5_ReWrite, &dev->flags);
}
if (test_bit(R5_ReadError, &dev->flags))
clear_bit(R5_Insync, &dev->flags);
if (!test_bit(R5_Insync, &dev->flags)) {
if (s->failed < 2)
s->failed_num[s->failed] = i;
s->failed++;
}
}
spin_unlock_irq(&conf->device_lock);
rcu_read_unlock();
return 0;
}
static int handle_stripe6(struct stripe_head *sh, struct stripe_head_state *s)
static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
{
raid5_conf_t *conf = sh->raid_conf;
int disks = sh->disks;
struct r5dev *dev;
int i;
/* Now to look around and see what can be done */
memset(s, 0, sizeof(*s));
s->syncing = test_bit(STRIPE_SYNCING, &sh->state);
s->expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);
s->failed_num[0] = -1;
s->failed_num[1] = -1;
/* Now to look around and see what can be done */
rcu_read_lock();
spin_lock_irq(&conf->device_lock);
for (i=disks; i--; ) {
mdk_rdev_t *rdev;
dev = &sh->dev[i];
pr_debug("check %d: state 0x%lx read %p write %p written %p\n",
@ -3015,9 +2942,9 @@ static int handle_stripe6(struct stripe_head *sh, struct stripe_head_state *s)
BUG_ON(s->compute > 2);
}
if (test_bit(R5_Wantfill, &dev->flags)) {
if (test_bit(R5_Wantfill, &dev->flags))
s->to_fill++;
} else if (dev->toread)
else if (dev->toread)
s->to_read++;
if (dev->towrite) {
s->to_write++;
@ -3057,14 +2984,11 @@ static int handle_stripe6(struct stripe_head *sh, struct stripe_head_state *s)
}
spin_unlock_irq(&conf->device_lock);
rcu_read_unlock();
return 0;
}
static void handle_stripe(struct stripe_head *sh)
{
struct stripe_head_state s;
int done;
raid5_conf_t *conf = sh->raid_conf;
int i;
int prexor;
@ -3090,21 +3014,8 @@ static void handle_stripe(struct stripe_head *sh)
(unsigned long long)sh->sector, sh->state,
atomic_read(&sh->count), sh->pd_idx, sh->qd_idx,
sh->check_state, sh->reconstruct_state);
memset(&s, 0, sizeof(s));
s.syncing = test_bit(STRIPE_SYNCING, &sh->state);
s.expanding = test_bit(STRIPE_EXPAND_SOURCE, &sh->state);
s.expanded = test_bit(STRIPE_EXPAND_READY, &sh->state);
s.failed_num[0] = -1;
s.failed_num[1] = -1;
if (conf->level == 6)
done = handle_stripe6(sh, &s);
else
done = handle_stripe5(sh, &s);
if (done)
goto finish;
analyse_stripe(sh, &s);
if (unlikely(s.blocked_rdev)) {
if (s.syncing || s.expanding || s.expanded ||