137 lines
4.9 KiB
C
137 lines
4.9 KiB
C
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/*
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* Copyright (C) 2009 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __BTRFS_FREE_SPACE_CACHE
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#define __BTRFS_FREE_SPACE_CACHE
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struct btrfs_free_space {
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struct rb_node offset_index;
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u64 offset;
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u64 bytes;
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u64 max_extent_size;
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unsigned long *bitmap;
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struct list_head list;
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};
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struct btrfs_free_space_ctl {
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spinlock_t tree_lock;
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struct rb_root free_space_offset;
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u64 free_space;
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int extents_thresh;
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int free_extents;
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int total_bitmaps;
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int unit;
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u64 start;
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const struct btrfs_free_space_op *op;
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void *private;
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struct mutex cache_writeout_mutex;
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struct list_head trimming_ranges;
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};
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struct btrfs_free_space_op {
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void (*recalc_thresholds)(struct btrfs_free_space_ctl *ctl);
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bool (*use_bitmap)(struct btrfs_free_space_ctl *ctl,
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struct btrfs_free_space *info);
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};
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struct btrfs_io_ctl;
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struct inode *lookup_free_space_inode(struct btrfs_root *root,
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struct btrfs_block_group_cache
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*block_group, struct btrfs_path *path);
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int create_free_space_inode(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path);
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int btrfs_check_trunc_cache_free_space(struct btrfs_root *root,
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struct btrfs_block_rsv *rsv);
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int btrfs_truncate_free_space_cache(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_block_group_cache *block_group,
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struct inode *inode);
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int load_free_space_cache(struct btrfs_fs_info *fs_info,
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struct btrfs_block_group_cache *block_group);
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int btrfs_wait_cache_io(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_io_ctl *io_ctl,
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struct btrfs_path *path, u64 offset);
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int btrfs_write_out_cache(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_path *path);
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struct inode *lookup_free_ino_inode(struct btrfs_root *root,
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struct btrfs_path *path);
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int create_free_ino_inode(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_path *path);
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int load_free_ino_cache(struct btrfs_fs_info *fs_info,
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struct btrfs_root *root);
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int btrfs_write_out_ino_cache(struct btrfs_root *root,
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struct btrfs_trans_handle *trans,
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struct btrfs_path *path,
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struct inode *inode);
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void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group);
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int __btrfs_add_free_space(struct btrfs_fs_info *fs_info,
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struct btrfs_free_space_ctl *ctl,
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u64 bytenr, u64 size);
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static inline int
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btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
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u64 bytenr, u64 size)
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{
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return __btrfs_add_free_space(block_group->fs_info,
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block_group->free_space_ctl,
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bytenr, size);
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}
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int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
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u64 bytenr, u64 size);
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void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
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void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
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*block_group);
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u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group,
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u64 offset, u64 bytes, u64 empty_size,
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u64 *max_extent_size);
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u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root);
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void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
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u64 bytes);
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int btrfs_find_space_cluster(struct btrfs_root *root,
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struct btrfs_block_group_cache *block_group,
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struct btrfs_free_cluster *cluster,
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u64 offset, u64 bytes, u64 empty_size);
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void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster);
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u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group,
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struct btrfs_free_cluster *cluster, u64 bytes,
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u64 min_start, u64 *max_extent_size);
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int btrfs_return_cluster_to_free_space(
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struct btrfs_block_group_cache *block_group,
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struct btrfs_free_cluster *cluster);
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int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group,
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u64 *trimmed, u64 start, u64 end, u64 minlen);
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/* Support functions for running our sanity tests */
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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int test_add_free_space_entry(struct btrfs_block_group_cache *cache,
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u64 offset, u64 bytes, bool bitmap);
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int test_check_exists(struct btrfs_block_group_cache *cache,
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u64 offset, u64 bytes);
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#endif
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#endif
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