drbd: Introduce new disk config option rs-discard-granularity
As long as the value is 0 the feature is disabled. With setting it to a positive value, DRBD limits and aligns its resync requests to the rs-discard-granularity setting. If the sync source detects all zeros in such a block, the resync target discards the range on disk. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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@ -1348,12 +1348,38 @@ static bool write_ordering_changed(struct disk_conf *a, struct disk_conf *b)
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a->disk_drain != b->disk_drain;
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}
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static void sanitize_disk_conf(struct disk_conf *disk_conf, struct drbd_backing_dev *nbc)
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static void sanitize_disk_conf(struct drbd_device *device, struct disk_conf *disk_conf,
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struct drbd_backing_dev *nbc)
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{
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struct request_queue * const q = nbc->backing_bdev->bd_disk->queue;
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if (disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
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disk_conf->al_extents = DRBD_AL_EXTENTS_MIN;
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if (disk_conf->al_extents > drbd_al_extents_max(nbc))
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disk_conf->al_extents = drbd_al_extents_max(nbc);
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if (!blk_queue_discard(q) || !q->limits.discard_zeroes_data) {
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disk_conf->rs_discard_granularity = 0; /* disable feature */
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drbd_info(device, "rs_discard_granularity feature disabled\n");
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}
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if (disk_conf->rs_discard_granularity) {
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int orig_value = disk_conf->rs_discard_granularity;
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int remainder;
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if (q->limits.discard_granularity > disk_conf->rs_discard_granularity)
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disk_conf->rs_discard_granularity = q->limits.discard_granularity;
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remainder = disk_conf->rs_discard_granularity % q->limits.discard_granularity;
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disk_conf->rs_discard_granularity += remainder;
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if (disk_conf->rs_discard_granularity > q->limits.max_discard_sectors << 9)
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disk_conf->rs_discard_granularity = q->limits.max_discard_sectors << 9;
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if (disk_conf->rs_discard_granularity != orig_value)
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drbd_info(device, "rs_discard_granularity changed to %d\n",
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disk_conf->rs_discard_granularity);
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}
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}
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int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
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@ -1403,7 +1429,7 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
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if (!expect(new_disk_conf->resync_rate >= 1))
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new_disk_conf->resync_rate = 1;
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sanitize_disk_conf(new_disk_conf, device->ldev);
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sanitize_disk_conf(device, new_disk_conf, device->ldev);
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if (new_disk_conf->c_plan_ahead > DRBD_C_PLAN_AHEAD_MAX)
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new_disk_conf->c_plan_ahead = DRBD_C_PLAN_AHEAD_MAX;
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@ -1698,7 +1724,7 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
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if (retcode != NO_ERROR)
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goto fail;
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sanitize_disk_conf(new_disk_conf, nbc);
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sanitize_disk_conf(device, new_disk_conf, nbc);
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if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
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drbd_err(device, "max capacity %llu smaller than disk size %llu\n",
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@ -123,14 +123,14 @@ GENL_struct(DRBD_NLA_DISK_CONF, 3, disk_conf,
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__u32_field_def(13, DRBD_GENLA_F_MANDATORY, c_fill_target, DRBD_C_FILL_TARGET_DEF)
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__u32_field_def(14, DRBD_GENLA_F_MANDATORY, c_max_rate, DRBD_C_MAX_RATE_DEF)
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__u32_field_def(15, DRBD_GENLA_F_MANDATORY, c_min_rate, DRBD_C_MIN_RATE_DEF)
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__u32_field_def(20, DRBD_GENLA_F_MANDATORY, disk_timeout, DRBD_DISK_TIMEOUT_DEF)
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__u32_field_def(21, 0 /* OPTIONAL */, read_balancing, DRBD_READ_BALANCING_DEF)
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__u32_field_def(25, 0 /* OPTIONAL */, rs_discard_granularity, DRBD_RS_DISCARD_GRANULARITY_DEF)
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__flg_field_def(16, DRBD_GENLA_F_MANDATORY, disk_barrier, DRBD_DISK_BARRIER_DEF)
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__flg_field_def(17, DRBD_GENLA_F_MANDATORY, disk_flushes, DRBD_DISK_FLUSHES_DEF)
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__flg_field_def(18, DRBD_GENLA_F_MANDATORY, disk_drain, DRBD_DISK_DRAIN_DEF)
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__flg_field_def(19, DRBD_GENLA_F_MANDATORY, md_flushes, DRBD_MD_FLUSHES_DEF)
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__u32_field_def(20, DRBD_GENLA_F_MANDATORY, disk_timeout, DRBD_DISK_TIMEOUT_DEF)
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__u32_field_def(21, 0 /* OPTIONAL */, read_balancing, DRBD_READ_BALANCING_DEF)
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/* 9: __u32_field_def(22, DRBD_GENLA_F_MANDATORY, unplug_watermark, DRBD_UNPLUG_WATERMARK_DEF) */
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__flg_field_def(23, 0 /* OPTIONAL */, al_updates, DRBD_AL_UPDATES_DEF)
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)
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@ -230,4 +230,10 @@
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#define DRBD_SOCKET_CHECK_TIMEO_MAX DRBD_PING_TIMEO_MAX
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#define DRBD_SOCKET_CHECK_TIMEO_DEF 0
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#define DRBD_SOCKET_CHECK_TIMEO_SCALE '1'
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#define DRBD_RS_DISCARD_GRANULARITY_MIN 0
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#define DRBD_RS_DISCARD_GRANULARITY_MAX (1<<20) /* 1MiByte */
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#define DRBD_RS_DISCARD_GRANULARITY_DEF 0 /* disabled by default */
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#define DRBD_RS_DISCARD_GRANULARITY_SCALE '1' /* bytes */
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#endif
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