fs/btrfs/zoned.h - linux - Git at Google

 /* 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"
 #include "block-group.h"

 /*
  * Block groups with more than this value (percents) of unusable space will be
  * scheduled for background reclaim.
  */
 #define BTRFS_DEFAULT_RECLAIM_THRESH		75

 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);
 void btrfs_calc_zone_unusable(struct btrfs_block_group *cache);
 void btrfs_redirty_list_add(struct btrfs_transaction *trans,
 			    struct extent_buffer *eb);
 void btrfs_free_redirty_list(struct btrfs_transaction *trans);
 bool btrfs_use_zone_append(struct btrfs_inode *inode, struct extent_map *em);
 void btrfs_record_physical_zoned(struct inode *inode, u64 file_offset,
 				 struct bio *bio);
 void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered);
 bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
 				    struct extent_buffer *eb,
 				    struct btrfs_block_group **cache_ret);
 void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache,
 				     struct extent_buffer *eb);
 int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length);
 int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
 				  u64 physical_start, u64 physical_pos);
 #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;
 }

 static inline void btrfs_calc_zone_unusable(struct btrfs_block_group *cache) { }

 static inline void btrfs_redirty_list_add(struct btrfs_transaction *trans,
 					  struct extent_buffer *eb) { }
 static inline void btrfs_free_redirty_list(struct btrfs_transaction *trans) { }

 static inline bool btrfs_use_zone_append(struct btrfs_inode *inode,
 					 struct extent_map *em)
 {
 	return false;
 }

 static inline void btrfs_record_physical_zoned(struct inode *inode,
 					       u64 file_offset, struct bio *bio)
 {
 }

 static inline void btrfs_rewrite_logical_zoned(
 				struct btrfs_ordered_extent *ordered) { }

 static inline bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
 			       struct extent_buffer *eb,
 			       struct btrfs_block_group **cache_ret)
 {
 	return true;
 }

 static inline void btrfs_revert_meta_write_pointer(
 						struct btrfs_block_group *cache,
 						struct extent_buffer *eb)
 {
 }

 static inline int btrfs_zoned_issue_zeroout(struct btrfs_device *device,
 					    u64 physical, u64 length)
 {
 	return -EOPNOTSUPP;
 }

 static inline int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev,
 						u64 logical, u64 physical_start,
 						u64 physical_pos)
 {
 	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)
 {
 	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);
 }

 static inline bool btrfs_can_zone_reset(struct btrfs_device *device,
 					u64 physical, u64 length)
 {
 	u64 zone_size;

 	if (!btrfs_dev_is_sequential(device, physical))
 		return false;

 	zone_size = device->zone_info->zone_size;
 	if (!IS_ALIGNED(physical, zone_size) || !IS_ALIGNED(length, zone_size))
 		return false;

 	return true;
 }

 static inline void btrfs_zoned_meta_io_lock(struct btrfs_fs_info *fs_info)
 {
 	if (!btrfs_is_zoned(fs_info))
 		return;
 	mutex_lock(&fs_info->zoned_meta_io_lock);
 }

 static inline void btrfs_zoned_meta_io_unlock(struct btrfs_fs_info *fs_info)
 {
 	if (!btrfs_is_zoned(fs_info))
 		return;
 	mutex_unlock(&fs_info->zoned_meta_io_lock);
 }

 static inline void btrfs_clear_treelog_bg(struct btrfs_block_group *bg)
 {
 	struct btrfs_fs_info *fs_info = bg->fs_info;

 	if (!btrfs_is_zoned(fs_info))
 		return;

 	spin_lock(&fs_info->treelog_bg_lock);
 	if (fs_info->treelog_bg == bg->start)
 		fs_info->treelog_bg = 0;
 	spin_unlock(&fs_info->treelog_bg_lock);
 }

 #endif
	/* 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"
	#include "block-group.h"

	/*
	* Block groups with more than this value (percents) of unusable space will be
	* scheduled for background reclaim.
	*/
	#define BTRFS_DEFAULT_RECLAIM_THRESH 75

	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);
	void btrfs_calc_zone_unusable(struct btrfs_block_group *cache);
	void btrfs_redirty_list_add(struct btrfs_transaction *trans,
	struct extent_buffer *eb);
	void btrfs_free_redirty_list(struct btrfs_transaction *trans);
	bool btrfs_use_zone_append(struct btrfs_inode inode, struct extent_map em);
	void btrfs_record_physical_zoned(struct inode *inode, u64 file_offset,
	struct bio *bio);
	void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered);
	bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
	struct extent_buffer *eb,
	struct btrfs_block_group **cache_ret);
	void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache,
	struct extent_buffer *eb);
	int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length);
	int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
	u64 physical_start, u64 physical_pos);
	#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;
	}

	static inline void btrfs_calc_zone_unusable(struct btrfs_block_group *cache) { }

	static inline void btrfs_redirty_list_add(struct btrfs_transaction *trans,
	struct extent_buffer *eb) { }
	static inline void btrfs_free_redirty_list(struct btrfs_transaction *trans) { }

	static inline bool btrfs_use_zone_append(struct btrfs_inode *inode,
	struct extent_map *em)
	{
	return false;
	}

	static inline void btrfs_record_physical_zoned(struct inode *inode,
	u64 file_offset, struct bio *bio)
	{
	}

	static inline void btrfs_rewrite_logical_zoned(
	struct btrfs_ordered_extent *ordered) { }

	static inline bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
	struct extent_buffer *eb,
	struct btrfs_block_group **cache_ret)
	{
	return true;
	}

	static inline void btrfs_revert_meta_write_pointer(
	struct btrfs_block_group *cache,
	struct extent_buffer *eb)
	{
	}

	static inline int btrfs_zoned_issue_zeroout(struct btrfs_device *device,
	u64 physical, u64 length)
	{
	return -EOPNOTSUPP;
	}

	static inline int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev,
	u64 logical, u64 physical_start,
	u64 physical_pos)
	{
	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)
	{
	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);
	}

	static inline bool btrfs_can_zone_reset(struct btrfs_device *device,
	u64 physical, u64 length)
	{
	u64 zone_size;

	if (!btrfs_dev_is_sequential(device, physical))
	return false;

	zone_size = device->zone_info->zone_size;
	if (!IS_ALIGNED(physical, zone_size) \|\| !IS_ALIGNED(length, zone_size))
	return false;

	return true;
	}

	static inline void btrfs_zoned_meta_io_lock(struct btrfs_fs_info *fs_info)
	{
	if (!btrfs_is_zoned(fs_info))
	return;
	mutex_lock(&fs_info->zoned_meta_io_lock);
	}

	static inline void btrfs_zoned_meta_io_unlock(struct btrfs_fs_info *fs_info)
	{
	if (!btrfs_is_zoned(fs_info))
	return;
	mutex_unlock(&fs_info->zoned_meta_io_lock);
	}

	static inline void btrfs_clear_treelog_bg(struct btrfs_block_group *bg)
	{
	struct btrfs_fs_info *fs_info = bg->fs_info;

	if (!btrfs_is_zoned(fs_info))
	return;

	spin_lock(&fs_info->treelog_bg_lock);
	if (fs_info->treelog_bg == bg->start)
	fs_info->treelog_bg = 0;
	spin_unlock(&fs_info->treelog_bg_lock);
	}

	#endif