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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef BTRFS_ZONED_H
#define BTRFS_ZONED_H
#include <linux/types.h>
#include <linux/blkdev.h>
struct btrfs_zoned_device_info {
/*
* Number of zones, zone size and types of zones if bdev is a
* zoned block device.
*/
u64 zone_size;
u8 zone_size_shift;
u32 nr_zones;
unsigned long *seq_zones;
unsigned long *empty_zones;
};
#ifdef CONFIG_BLK_DEV_ZONED
int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
struct blk_zone *zone);
int btrfs_get_dev_zone_info(struct btrfs_device *device);
void btrfs_destroy_dev_zone_info(struct btrfs_device *device);
int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info);
#else /* CONFIG_BLK_DEV_ZONED */
static inline int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
struct blk_zone *zone)
{
return 0;
}
static inline int btrfs_get_dev_zone_info(struct btrfs_device *device)
{
return 0;
}
static inline void btrfs_destroy_dev_zone_info(struct btrfs_device *device) { }
static inline int btrfs_check_zoned_mode(const struct btrfs_fs_info *fs_info)
{
if (!btrfs_is_zoned(fs_info))
return 0;
btrfs_err(fs_info, "zoned block devices support is not enabled");
return -EOPNOTSUPP;
}
#endif
static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)
{
struct btrfs_zoned_device_info *zone_info = device->zone_info;
if (!zone_info)
return false;
return test_bit(pos >> zone_info->zone_size_shift, zone_info->seq_zones);
}
static inline bool btrfs_dev_is_empty_zone(struct btrfs_device *device, u64 pos)
{
struct btrfs_zoned_device_info *zone_info = device->zone_info;
if (!zone_info)
return true;
return test_bit(pos >> zone_info->zone_size_shift, zone_info->empty_zones);
}
static inline void btrfs_dev_set_empty_zone_bit(struct btrfs_device *device,
u64 pos, bool set)
{
struct btrfs_zoned_device_info *zone_info = device->zone_info;
unsigned int zno;
if (!zone_info)
return;
zno = pos >> zone_info->zone_size_shift;
if (set)
set_bit(zno, zone_info->empty_zones);
else
clear_bit(zno, zone_info->empty_zones);
}
static inline void btrfs_dev_set_zone_empty(struct btrfs_device *device, u64 pos)
{
btrfs_dev_set_empty_zone_bit(device, pos, true);
}
static inline void btrfs_dev_clear_zone_empty(struct btrfs_device *device, u64 pos)
{
btrfs_dev_set_empty_zone_bit(device, pos, false);
}
static inline bool btrfs_check_device_zone_type(const struct btrfs_fs_info *fs_info,
struct block_device *bdev)
{
u64 zone_size;
if (btrfs_is_zoned(fs_info)) {
zone_size = bdev_zone_sectors(bdev) << SECTOR_SHIFT;
/* Do not allow non-zoned device */
return bdev_is_zoned(bdev) && fs_info->zone_size == zone_size;
}
/* Do not allow Host Manged zoned device */
return bdev_zoned_model(bdev) != BLK_ZONED_HM;
}
#endif
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