From d12ffdd1aa4c165774748265c67af3aa1edab1a0 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Wed, 19 Jun 2019 13:47:17 -0400 Subject: btrfs: move btrfs_block_rsv definitions into it's own header Prep work for separating out all of the block_rsv related code into its own file. Signed-off-by: Josef Bacik Signed-off-by: David Sterba --- fs/btrfs/block-rsv.h | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 fs/btrfs/block-rsv.h (limited to 'fs/btrfs/block-rsv.h') diff --git a/fs/btrfs/block-rsv.h b/fs/btrfs/block-rsv.h new file mode 100644 index 000000000000..359e73d329e7 --- /dev/null +++ b/fs/btrfs/block-rsv.h @@ -0,0 +1,77 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef BTRFS_BLOCK_RSV_H +#define BTRFS_BLOCK_RSV_H + +enum btrfs_reserve_flush_enum; + +/* + * Types of block reserves + */ +enum { + 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; + unsigned short full; + unsigned short type; + unsigned short failfast; + + /* + * 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, unsigned short type); +struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info, + unsigned short type); +void btrfs_init_metadata_block_rsv(struct btrfs_fs_info *fs_info, + struct btrfs_block_rsv *rsv, + unsigned short type); +void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info, + struct btrfs_block_rsv *rsv); +int btrfs_block_rsv_add(struct btrfs_root *root, + 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_factor); +int btrfs_block_rsv_refill(struct btrfs_root *root, + 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); +int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, + struct btrfs_block_rsv *dest, u64 num_bytes, + int min_factor); +void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info, + struct btrfs_block_rsv *block_rsv, + u64 num_bytes); + +#endif /* BTRFS_BLOCK_RSV_H */ -- cgit v1.2.3