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| author | shli@kernel.org <shli@kernel.org> | 2014-12-15 02:57:03 +0100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2015-04-22 00:00:41 +0200 |
| commit | 7a87f43405e91ca12b8770eb689dd9886f217091 (patch) | |
| tree | 144c8e5d5a1c4afcef0a7a6f3d5d6c5d1bfceaac /drivers/md/raid5.c | |
| parent | raid5: add a new flag to track if a stripe can be batched (diff) | |
| download | linux-7a87f43405e91ca12b8770eb689dd9886f217091.tar.xz linux-7a87f43405e91ca12b8770eb689dd9886f217091.zip | |
raid5: track overwrite disk count
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>
Diffstat (limited to 'drivers/md/raid5.c')
| -rw-r--r-- | drivers/md/raid5.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 49b0f23dbad2..e801c6669c6d 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -553,6 +553,7 @@ retry: } 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) { |