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block: rework zone reporting

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Avoid the need to allocate a potentially large array of struct blk_zone
in the block layer by switching the ->report_zones method interface to
a callback model. Now the caller simply supplies a callback that is
executed on each reported zone, and private data for it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2019-11-11 11:39:30 +09:00
committed by Jens Axboe
parent 23a50861ad
commit d41003513e
12 changed files with 346 additions and 464 deletions
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24
include/linux/device-mapper.h
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@@ -17,6 +17,7 @@
struct dm_dev;
struct dm_target;
struct dm_table;
struct dm_report_zones_args;
struct mapped_device;
struct bio_vec;
@@ -93,9 +94,9 @@ typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv,
typedef int (*dm_prepare_ioctl_fn) (struct dm_target *ti, struct block_device **bdev);
typedef int (*dm_report_zones_fn) (struct dm_target *ti, sector_t sector,
struct blk_zone *zones,
unsigned int *nr_zones);
typedef int (*dm_report_zones_fn) (struct dm_target *ti,
struct dm_report_zones_args *args,
unsigned int nr_zones);
/*
* These iteration functions are typically used to check (and combine)
@@ -422,10 +423,23 @@ struct gendisk *dm_disk(struct mapped_device *md);
int dm_suspended(struct dm_target *ti);
int dm_noflush_suspending(struct dm_target *ti);
void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors);
void dm_remap_zone_report(struct dm_target *ti, sector_t start,
struct blk_zone *zones, unsigned int *nr_zones);
union map_info *dm_get_rq_mapinfo(struct request *rq);
#ifdef CONFIG_BLK_DEV_ZONED
struct dm_report_zones_args {
struct dm_target *tgt;
sector_t next_sector;
void *orig_data;
report_zones_cb orig_cb;
unsigned int zone_idx;
/* must be filled by ->report_zones before calling dm_report_zones_cb */
sector_t start;
};
int dm_report_zones_cb(struct blk_zone *zone, unsigned int idx, void *data);
#endif /* CONFIG_BLK_DEV_ZONED */
/*
* Device mapper functions to parse and create devices specified by the
* parameter "dm-mod.create="