diff options
author | Christoph Hellwig <hch@lst.de> | 2019-12-03 10:39:06 +0100 |
---|---|---|
committer | Jens Axboe <axboe@kernel.dk> | 2019-12-03 08:51:25 -0700 |
commit | e94f5819448c5b75829662eaa9c25c17868846cf (patch) | |
tree | f09a91b456a3176daea18dcd2e598a4585f38eae /block/blk-zoned.c | |
parent | f216fdd77b5654f8c4f6fac6020d6aabc58878ef (diff) | |
download | lwn-e94f5819448c5b75829662eaa9c25c17868846cf.tar.gz lwn-e94f5819448c5b75829662eaa9c25c17868846cf.zip |
block: allocate the zone bitmaps lazily
Allocate the conventional zone bitmap and the sequential zone locking
bitmap only when we find a zone of the respective type. This avoids
wasting memory on the conventional zone bitmap for devices that only
have sequential zones, and will also prepare for other future changes.
Reviewed-by: Javier González <javier@javigon.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-zoned.c')
-rw-r--r-- | block/blk-zoned.c | 65 |
1 files changed, 32 insertions, 33 deletions
diff --git a/block/blk-zoned.c b/block/blk-zoned.c index 9c3931051f4f..0131f9e14bd1 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -342,6 +342,7 @@ struct blk_revalidate_zone_args { struct gendisk *disk; unsigned long *conv_zones_bitmap; unsigned long *seq_zones_wlock; + unsigned int nr_zones; sector_t sector; }; @@ -385,8 +386,22 @@ static int blk_revalidate_zone_cb(struct blk_zone *zone, unsigned int idx, /* Check zone type */ switch (zone->type) { case BLK_ZONE_TYPE_CONVENTIONAL: + if (!args->conv_zones_bitmap) { + args->conv_zones_bitmap = + blk_alloc_zone_bitmap(q->node, args->nr_zones); + if (!args->conv_zones_bitmap) + return -ENOMEM; + } + set_bit(idx, args->conv_zones_bitmap); + break; case BLK_ZONE_TYPE_SEQWRITE_REQ: case BLK_ZONE_TYPE_SEQWRITE_PREF: + if (!args->seq_zones_wlock) { + args->seq_zones_wlock = + blk_alloc_zone_bitmap(q->node, args->nr_zones); + if (!args->seq_zones_wlock) + return -ENOMEM; + } break; default: pr_warn("%s: Invalid zone type 0x%x at sectors %llu\n", @@ -394,37 +409,10 @@ static int blk_revalidate_zone_cb(struct blk_zone *zone, unsigned int idx, return -ENODEV; } - if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) - set_bit(idx, args->conv_zones_bitmap); - args->sector += zone->len; return 0; } -static int blk_update_zone_info(struct gendisk *disk, unsigned int nr_zones, - struct blk_revalidate_zone_args *args) -{ - /* - * Ensure that all memory allocations in this context are done as - * if GFP_NOIO was specified. - */ - unsigned int noio_flag = memalloc_noio_save(); - struct request_queue *q = disk->queue; - int ret; - - args->seq_zones_wlock = blk_alloc_zone_bitmap(q->node, nr_zones); - if (!args->seq_zones_wlock) - return -ENOMEM; - args->conv_zones_bitmap = blk_alloc_zone_bitmap(q->node, nr_zones); - if (!args->conv_zones_bitmap) - return -ENOMEM; - - ret = disk->fops->report_zones(disk, 0, nr_zones, - blk_revalidate_zone_cb, args); - memalloc_noio_restore(noio_flag); - return ret; -} - /** * blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps * @disk: Target disk @@ -437,8 +425,10 @@ static int blk_update_zone_info(struct gendisk *disk, unsigned int nr_zones, int blk_revalidate_disk_zones(struct gendisk *disk) { struct request_queue *q = disk->queue; - unsigned int nr_zones = blkdev_nr_zones(disk); - struct blk_revalidate_zone_args args = { .disk = disk }; + struct blk_revalidate_zone_args args = { + .disk = disk, + .nr_zones = blkdev_nr_zones(disk), + }; int ret = 0; if (WARN_ON_ONCE(!blk_queue_is_zoned(q))) @@ -449,12 +439,21 @@ int blk_revalidate_disk_zones(struct gendisk *disk) * needs to be updated so that the sysfs exposed value is correct. */ if (!queue_is_mq(q)) { - q->nr_zones = nr_zones; + q->nr_zones = args.nr_zones; return 0; } - if (nr_zones) - ret = blk_update_zone_info(disk, nr_zones, &args); + /* + * Ensure that all memory allocations in this context are done as + * if GFP_NOIO was specified. + */ + if (args.nr_zones) { + unsigned int noio_flag = memalloc_noio_save(); + + ret = disk->fops->report_zones(disk, 0, args.nr_zones, + blk_revalidate_zone_cb, &args); + memalloc_noio_restore(noio_flag); + } /* * Install the new bitmaps, making sure the queue is stopped and @@ -463,7 +462,7 @@ int blk_revalidate_disk_zones(struct gendisk *disk) */ blk_mq_freeze_queue(q); if (ret >= 0) { - q->nr_zones = nr_zones; + q->nr_zones = args.nr_zones; swap(q->seq_zones_wlock, args.seq_zones_wlock); swap(q->conv_zones_bitmap, args.conv_zones_bitmap); ret = 0; |