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raid5: track overwrite disk count

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Track overwrite disk count, so we can know if a stripe is a full stripe write.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
shli@kernel.org 2014-12-15 12:57:03 +11:00 committed by NeilBrown
parent da41ba6597
commit 7a87f43405
2 changed files with 17 additions and 1 deletions
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14
drivers/md/raid5.c
View File

@ -553,6 +553,7 @@ static void init_stripe(struct stripe_head *sh, sector_t sector, int previous)
}
if (read_seqcount_retry(&conf->gen_lock, seq))
goto retry;
sh->overwrite_disks = 0;
insert_hash(conf, sh);
sh->cpu = smp_processor_id();
set_bit(STRIPE_BATCH_READY, &sh->state);
@ -710,6 +711,12 @@ get_active_stripe(struct r5conf *conf, sector_t sector,
return sh;
}
static bool is_full_stripe_write(struct stripe_head *sh)
{
BUG_ON(sh->overwrite_disks > (sh->disks - sh->raid_conf->max_degraded));
return sh->overwrite_disks == (sh->disks - sh->raid_conf->max_degraded);
}
/* Determine if 'data_offset' or 'new_data_offset' should be used
* in this stripe_head.
*/
@ -1413,6 +1420,7 @@ ops_run_biodrain(struct stripe_head *sh, struct dma_async_tx_descriptor *tx)
spin_lock_irq(&sh->stripe_lock);
chosen = dev->towrite;
dev->towrite = NULL;
sh->overwrite_disks = 0;
BUG_ON(dev->written);
wbi = dev->written = chosen;
spin_unlock_irq(&sh->stripe_lock);
@ -2700,7 +2708,8 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx,
sector = bio_end_sector(bi);
}
if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS)
set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags);
if (!test_and_set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags))
sh->overwrite_disks++;
}
pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n",
@ -2772,6 +2781,7 @@ handle_failed_stripe(struct r5conf *conf, struct stripe_head *sh,
/* fail all writes first */
bi = sh->dev[i].towrite;
sh->dev[i].towrite = NULL;
sh->overwrite_disks = 0;
spin_unlock_irq(&sh->stripe_lock);
if (bi)
bitmap_end = 1;
@ -4630,12 +4640,14 @@ static void make_discard_request(struct mddev *mddev, struct bio *bi)
}
set_bit(STRIPE_DISCARD, &sh->state);
finish_wait(&conf->wait_for_overlap, &w);
sh->overwrite_disks = 0;
for (d = 0; d < conf->raid_disks; d++) {
if (d == sh->pd_idx || d == sh->qd_idx)
continue;
sh->dev[d].towrite = bi;
set_bit(R5_OVERWRITE, &sh->dev[d].flags);
raid5_inc_bi_active_stripes(bi);
sh->overwrite_disks++;
}
spin_unlock_irq(&sh->stripe_lock);
if (conf->mddev->bitmap) {

4
drivers/md/raid5.h
View File

@ -210,6 +210,10 @@ struct stripe_head {
atomic_t count; /* nr of active thread/requests */
int bm_seq; /* sequence number for bitmap flushes */
int disks; /* disks in stripe */
int overwrite_disks; /* total overwrite disks in stripe,
* this is only checked when stripe
* has STRIPE_BATCH_READY
*/
enum check_states check_state;
enum reconstruct_states reconstruct_state;
spinlock_t stripe_lock;