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block: allocate the zone bitmaps lazily

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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>
This commit is contained in:
Christoph Hellwig 2019-12-03 10:39:06 +01:00 committed by Jens Axboe
parent f216fdd77b
commit e94f581944
1 changed files with 32 additions and 33 deletions
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65
block/blk-zoned.c
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@ -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;