From f63f17350e537300312e9e19b51f69b61fa44291 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Sun, 3 Mar 2024 07:01:46 -0700 Subject: md/raid5: use the atomic queue limit update APIs Build the queue limits outside the queue and apply them using queue_limits_set. To make the code more obvious also split the queue limits handling into separate helpers. Signed-off-by: Christoph Hellwig Reviewed--by: Song Liu Tested-by: Song Liu Signed-off-by: Song Liu Link: https://lore.kernel.org/r/20240303140150.5435-8-hch@lst.de --- drivers/md/raid5.c | 130 ++++++++++++++++++++++++++--------------------------- 1 file changed, 65 insertions(+), 65 deletions(-) (limited to 'drivers/md') diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index f8a81176eff8..5012069782ba 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -7691,10 +7691,65 @@ static int only_parity(int raid_disk, int algo, int raid_disks, int max_degraded return 0; } -static void raid5_set_io_opt(struct r5conf *conf) +static int raid5_set_limits(struct mddev *mddev) { - blk_queue_io_opt(conf->mddev->queue, (conf->chunk_sectors << 9) * - (conf->raid_disks - conf->max_degraded)); + struct r5conf *conf = mddev->private; + struct queue_limits lim; + int data_disks, stripe; + struct md_rdev *rdev; + + /* + * The read-ahead size must cover two whole stripes, which is + * 2 * (datadisks) * chunksize where 'n' is the number of raid devices. + */ + data_disks = conf->previous_raid_disks - conf->max_degraded; + + /* + * We can only discard a whole stripe. It doesn't make sense to + * discard data disk but write parity disk + */ + stripe = roundup_pow_of_two(data_disks * (mddev->chunk_sectors << 9)); + + blk_set_stacking_limits(&lim); + lim.io_min = mddev->chunk_sectors << 9; + lim.io_opt = lim.io_min * (conf->raid_disks - conf->max_degraded); + lim.raid_partial_stripes_expensive = 1; + lim.discard_granularity = stripe; + lim.max_write_zeroes_sectors = 0; + mddev_stack_rdev_limits(mddev, &lim); + rdev_for_each(rdev, mddev) + queue_limits_stack_bdev(&lim, rdev->bdev, rdev->new_data_offset, + mddev->gendisk->disk_name); + + /* + * Zeroing is required for discard, otherwise data could be lost. + * + * Consider a scenario: discard a stripe (the stripe could be + * inconsistent if discard_zeroes_data is 0); write one disk of the + * stripe (the stripe could be inconsistent again depending on which + * disks are used to calculate parity); the disk is broken; The stripe + * data of this disk is lost. + * + * We only allow DISCARD if the sysadmin has confirmed that only safe + * devices are in use by setting a module parameter. A better idea + * might be to turn DISCARD into WRITE_ZEROES requests, as that is + * required to be safe. + */ + if (!devices_handle_discard_safely || + lim.max_discard_sectors < (stripe >> 9) || + lim.discard_granularity < stripe) + lim.max_hw_discard_sectors = 0; + + /* + * Requests require having a bitmap for each stripe. + * Limit the max sectors based on this. + */ + lim.max_hw_sectors = RAID5_MAX_REQ_STRIPES << RAID5_STRIPE_SHIFT(conf); + + /* No restrictions on the number of segments in the request */ + lim.max_segments = USHRT_MAX; + + return queue_limits_set(mddev->queue, &lim); } static int raid5_run(struct mddev *mddev) @@ -7707,6 +7762,7 @@ static int raid5_run(struct mddev *mddev) int i; long long min_offset_diff = 0; int first = 1; + int ret = -EIO; if (mddev->recovery_cp != MaxSector) pr_notice("md/raid:%s: not clean -- starting background reconstruction\n", @@ -7960,65 +8016,9 @@ static int raid5_run(struct mddev *mddev) md_set_array_sectors(mddev, raid5_size(mddev, 0, 0)); if (!mddev_is_dm(mddev)) { - int chunk_size; - /* read-ahead size must cover two whole stripes, which - * is 2 * (datadisks) * chunksize where 'n' is the - * number of raid devices - */ - int data_disks = conf->previous_raid_disks - conf->max_degraded; - int stripe = data_disks * - ((mddev->chunk_sectors << 9) / PAGE_SIZE); - - chunk_size = mddev->chunk_sectors << 9; - blk_queue_io_min(mddev->queue, chunk_size); - raid5_set_io_opt(conf); - mddev->queue->limits.raid_partial_stripes_expensive = 1; - /* - * We can only discard a whole stripe. It doesn't make sense to - * discard data disk but write parity disk - */ - stripe = stripe * PAGE_SIZE; - stripe = roundup_pow_of_two(stripe); - mddev->queue->limits.discard_granularity = stripe; - - blk_queue_max_write_zeroes_sectors(mddev->queue, 0); - - rdev_for_each(rdev, mddev) { - disk_stack_limits(mddev->gendisk, rdev->bdev, - rdev->data_offset << 9); - disk_stack_limits(mddev->gendisk, rdev->bdev, - rdev->new_data_offset << 9); - } - - /* - * zeroing is required, otherwise data - * could be lost. Consider a scenario: discard a stripe - * (the stripe could be inconsistent if - * discard_zeroes_data is 0); write one disk of the - * stripe (the stripe could be inconsistent again - * depending on which disks are used to calculate - * parity); the disk is broken; The stripe data of this - * disk is lost. - * - * We only allow DISCARD if the sysadmin has confirmed that - * only safe devices are in use by setting a module parameter. - * A better idea might be to turn DISCARD into WRITE_ZEROES - * requests, as that is required to be safe. - */ - if (!devices_handle_discard_safely || - mddev->queue->limits.max_discard_sectors < (stripe >> 9) || - mddev->queue->limits.discard_granularity < stripe) - blk_queue_max_discard_sectors(mddev->queue, 0); - - /* - * Requests require having a bitmap for each stripe. - * Limit the max sectors based on this. - */ - blk_queue_max_hw_sectors(mddev->queue, - RAID5_MAX_REQ_STRIPES << RAID5_STRIPE_SHIFT(conf)); - - /* No restrictions on the number of segments in the request */ - blk_queue_max_segments(mddev->queue, USHRT_MAX); + ret = raid5_set_limits(mddev); + if (ret) + goto abort; } if (log_init(conf, journal_dev, raid5_has_ppl(conf))) @@ -8031,7 +8031,7 @@ abort: free_conf(conf); mddev->private = NULL; pr_warn("md/raid:%s: failed to run raid set.\n", mdname(mddev)); - return -EIO; + return ret; } static void raid5_free(struct mddev *mddev, void *priv) @@ -8563,8 +8563,8 @@ static void end_reshape(struct r5conf *conf) spin_unlock_irq(&conf->device_lock); wake_up(&conf->wait_for_overlap); - if (!mddev_is_dm(conf->mddev)) - raid5_set_io_opt(conf); + mddev_update_io_opt(conf->mddev, + conf->raid_disks - conf->max_degraded); } } -- cgit v1.2.3