mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 00:04:15 +08:00
428c8e0310
The div_factor* helpers calculate fraction or percentage fraction. The name is a bit confusing, we use it only for percentage calculations and there are two helpers. There's a helper mult_frac that's for general fractions, that tries to be accurate but we multiply and divide by small numbers so we can use the div_u64 helper. Rename the div_factor* helpers and use 1..100 percentage range, also drop the case checking for percentage == 100, it's never hit. The conversions: * div_factor calculates tenths and the numbers need to be adjusted * div_factor_fine is direct replacement Signed-off-by: David Sterba <dsterba@suse.com>
103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
|
|
#ifndef BTRFS_BLOCK_RSV_H
|
|
#define BTRFS_BLOCK_RSV_H
|
|
|
|
struct btrfs_trans_handle;
|
|
struct btrfs_root;
|
|
enum btrfs_reserve_flush_enum;
|
|
|
|
/*
|
|
* Types of block reserves
|
|
*/
|
|
enum btrfs_rsv_type {
|
|
BTRFS_BLOCK_RSV_GLOBAL,
|
|
BTRFS_BLOCK_RSV_DELALLOC,
|
|
BTRFS_BLOCK_RSV_TRANS,
|
|
BTRFS_BLOCK_RSV_CHUNK,
|
|
BTRFS_BLOCK_RSV_DELOPS,
|
|
BTRFS_BLOCK_RSV_DELREFS,
|
|
BTRFS_BLOCK_RSV_EMPTY,
|
|
BTRFS_BLOCK_RSV_TEMP,
|
|
};
|
|
|
|
struct btrfs_block_rsv {
|
|
u64 size;
|
|
u64 reserved;
|
|
struct btrfs_space_info *space_info;
|
|
spinlock_t lock;
|
|
bool full;
|
|
bool failfast;
|
|
/* Block reserve type, one of BTRFS_BLOCK_RSV_* */
|
|
enum btrfs_rsv_type type:8;
|
|
|
|
/*
|
|
* Qgroup equivalent for @size @reserved
|
|
*
|
|
* Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
|
|
* about things like csum size nor how many tree blocks it will need to
|
|
* reserve.
|
|
*
|
|
* Qgroup cares more about net change of the extent usage.
|
|
*
|
|
* So for one newly inserted file extent, in worst case it will cause
|
|
* leaf split and level increase, nodesize for each file extent is
|
|
* already too much.
|
|
*
|
|
* In short, qgroup_size/reserved is the upper limit of possible needed
|
|
* qgroup metadata reservation.
|
|
*/
|
|
u64 qgroup_rsv_size;
|
|
u64 qgroup_rsv_reserved;
|
|
};
|
|
|
|
void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, enum btrfs_rsv_type type);
|
|
void btrfs_init_root_block_rsv(struct btrfs_root *root);
|
|
struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
|
|
enum btrfs_rsv_type type);
|
|
void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *rsv,
|
|
enum btrfs_rsv_type type);
|
|
void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *rsv);
|
|
int btrfs_block_rsv_add(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *block_rsv, u64 num_bytes,
|
|
enum btrfs_reserve_flush_enum flush);
|
|
int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_percent);
|
|
int btrfs_block_rsv_refill(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *block_rsv, u64 min_reserved,
|
|
enum btrfs_reserve_flush_enum flush);
|
|
int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
|
|
struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
|
|
bool update_size);
|
|
int btrfs_block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, u64 num_bytes);
|
|
void btrfs_block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv,
|
|
u64 num_bytes, bool update_size);
|
|
u64 btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *block_rsv,
|
|
u64 num_bytes, u64 *qgroup_to_release);
|
|
void btrfs_update_global_block_rsv(struct btrfs_fs_info *fs_info);
|
|
void btrfs_init_global_block_rsv(struct btrfs_fs_info *fs_info);
|
|
void btrfs_release_global_block_rsv(struct btrfs_fs_info *fs_info);
|
|
struct btrfs_block_rsv *btrfs_use_block_rsv(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
u32 blocksize);
|
|
static inline void btrfs_unuse_block_rsv(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_block_rsv *block_rsv,
|
|
u32 blocksize)
|
|
{
|
|
btrfs_block_rsv_add_bytes(block_rsv, blocksize, false);
|
|
btrfs_block_rsv_release(fs_info, block_rsv, 0, NULL);
|
|
}
|
|
|
|
/*
|
|
* Fast path to check if the reserve is full, may be carefully used outside of
|
|
* locks.
|
|
*/
|
|
static inline bool btrfs_block_rsv_full(const struct btrfs_block_rsv *rsv)
|
|
{
|
|
return data_race(rsv->full);
|
|
}
|
|
|
|
#endif /* BTRFS_BLOCK_RSV_H */
|