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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>
#include "volumes.h"
#include "disk-io.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;
u64 max_zone_append_size;
u32 nr_zones;
unsigned long *seq_zones;
unsigned long *empty_zones;
struct blk_zone sb_zones[2 * BTRFS_SUPER_MIRROR_MAX];
};
#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_all_devices(struct btrfs_fs_info *fs_info);
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);
int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info);
int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw,
u64 *bytenr_ret);
int btrfs_sb_log_location(struct btrfs_device *device, int mirror, int rw,
u64 *bytenr_ret);
void btrfs_advance_sb_log(struct btrfs_device *device, int mirror);
int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror);
u64 btrfs_find_allocatable_zones(struct btrfs_device *device, u64 hole_start,
u64 hole_end, u64 num_bytes);
int btrfs_reset_device_zone(struct btrfs_device *device, u64 physical,
u64 length, u64 *bytes);
int btrfs_ensure_empty_zones(struct btrfs_device *device, u64 start, u64 size);
int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new);
#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_all_devices(struct btrfs_fs_info *fs_info)
{
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;
}
static inline int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info)
{
return 0;
}
static inline int btrfs_sb_log_location_bdev(struct block_device *bdev,
int mirror, int rw, u64 *bytenr_ret)
{
*bytenr_ret = btrfs_sb_offset(mirror);
return 0;
}
static inline int btrfs_sb_log_location(struct btrfs_device *device, int mirror,
int rw, u64 *bytenr_ret)
{
*bytenr_ret = btrfs_sb_offset(mirror);
return 0;
}
static inline void btrfs_advance_sb_log(struct btrfs_device *device, int mirror)
{ }
static inline int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror)
{
return 0;
}
static inline u64 btrfs_find_allocatable_zones(struct btrfs_device *device,
u64 hole_start, u64 hole_end,
u64 num_bytes)
{
return hole_start;
}
static inline int btrfs_reset_device_zone(struct btrfs_device *device,
u64 physical, u64 length, u64 *bytes)
{
*bytes = 0;
return 0;
}
static inline int btrfs_ensure_empty_zones(struct btrfs_device *device,
u64 start, u64 size)
{
return 0;
}
static inline int btrfs_load_block_group_zone_info(
struct btrfs_block_group *cache, bool new)
{
return 0;
}
#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)
{
if (btrfs_is_zoned(fs_info)) {
/*
* We can allow a regular device on a zoned filesystem, because
* we will emulate the zoned capabilities.
*/
if (!bdev_is_zoned(bdev))
return true;
return fs_info->zone_size ==
(bdev_zone_sectors(bdev) << SECTOR_SHIFT);
}
/* Do not allow Host Manged zoned device */
return bdev_zoned_model(bdev) != BLK_ZONED_HM;
}
static inline bool btrfs_check_super_location(struct btrfs_device *device, u64 pos)
{
/*
* On a non-zoned device, any address is OK. On a zoned device,
* non-SEQUENTIAL WRITE REQUIRED zones are capable.
*/
return device->zone_info == NULL || !btrfs_dev_is_sequential(device, pos);
}
#endif
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