cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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block-rsv.h (3271B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2
      3#ifndef BTRFS_BLOCK_RSV_H
      4#define BTRFS_BLOCK_RSV_H
      5
      6struct btrfs_trans_handle;
      7enum btrfs_reserve_flush_enum;
      8
      9/*
     10 * Types of block reserves
     11 */
     12enum {
     13	BTRFS_BLOCK_RSV_GLOBAL,
     14	BTRFS_BLOCK_RSV_DELALLOC,
     15	BTRFS_BLOCK_RSV_TRANS,
     16	BTRFS_BLOCK_RSV_CHUNK,
     17	BTRFS_BLOCK_RSV_DELOPS,
     18	BTRFS_BLOCK_RSV_DELREFS,
     19	BTRFS_BLOCK_RSV_EMPTY,
     20	BTRFS_BLOCK_RSV_TEMP,
     21};
     22
     23struct btrfs_block_rsv {
     24	u64 size;
     25	u64 reserved;
     26	struct btrfs_space_info *space_info;
     27	spinlock_t lock;
     28	unsigned short full;
     29	unsigned short type;
     30	unsigned short failfast;
     31
     32	/*
     33	 * Qgroup equivalent for @size @reserved
     34	 *
     35	 * Unlike normal @size/@reserved for inode rsv, qgroup doesn't care
     36	 * about things like csum size nor how many tree blocks it will need to
     37	 * reserve.
     38	 *
     39	 * Qgroup cares more about net change of the extent usage.
     40	 *
     41	 * So for one newly inserted file extent, in worst case it will cause
     42	 * leaf split and level increase, nodesize for each file extent is
     43	 * already too much.
     44	 *
     45	 * In short, qgroup_size/reserved is the upper limit of possible needed
     46	 * qgroup metadata reservation.
     47	 */
     48	u64 qgroup_rsv_size;
     49	u64 qgroup_rsv_reserved;
     50};
     51
     52void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
     53void btrfs_init_root_block_rsv(struct btrfs_root *root);
     54struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
     55					      unsigned short type);
     56void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info,
     57				   struct btrfs_block_rsv *rsv,
     58				   unsigned short type);
     59void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
     60			  struct btrfs_block_rsv *rsv);
     61int btrfs_block_rsv_add(struct btrfs_fs_info *fs_info,
     62			struct btrfs_block_rsv *block_rsv, u64 num_bytes,
     63			enum btrfs_reserve_flush_enum flush);
     64int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
     65int btrfs_block_rsv_refill(struct btrfs_fs_info *fs_info,
     66			   struct btrfs_block_rsv *block_rsv, u64 min_reserved,
     67			   enum btrfs_reserve_flush_enum flush);
     68int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
     69			    struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
     70			    bool update_size);
     71int btrfs_block_rsv_use_bytes(struct btrfs_block_rsv *block_rsv, u64 num_bytes);
     72int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
     73			     struct btrfs_block_rsv *dest, u64 num_bytes,
     74			     int min_factor);
     75void btrfs_block_rsv_add_bytes(struct btrfs_block_rsv *block_rsv,
     76			       u64 num_bytes, bool update_size);
     77u64 btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
     78			      struct btrfs_block_rsv *block_rsv,
     79			      u64 num_bytes, u64 *qgroup_to_release);
     80void btrfs_update_global_block_rsv(struct btrfs_fs_info *fs_info);
     81void btrfs_init_global_block_rsv(struct btrfs_fs_info *fs_info);
     82void btrfs_release_global_block_rsv(struct btrfs_fs_info *fs_info);
     83struct btrfs_block_rsv *btrfs_use_block_rsv(struct btrfs_trans_handle *trans,
     84					    struct btrfs_root *root,
     85					    u32 blocksize);
     86static inline void btrfs_unuse_block_rsv(struct btrfs_fs_info *fs_info,
     87					 struct btrfs_block_rsv *block_rsv,
     88					 u32 blocksize)
     89{
     90	btrfs_block_rsv_add_bytes(block_rsv, blocksize, false);
     91	btrfs_block_rsv_release(fs_info, block_rsv, 0, NULL);
     92}
     93
     94#endif /* BTRFS_BLOCK_RSV_H */