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TOMOYO Linux Cross Reference
Linux/fs/btrfs/disk-io.h

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  1 /*
  2  * Copyright (C) 2007 Oracle.  All rights reserved.
  3  *
  4  * This program is free software; you can redistribute it and/or
  5  * modify it under the terms of the GNU General Public
  6  * License v2 as published by the Free Software Foundation.
  7  *
  8  * This program is distributed in the hope that it will be useful,
  9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 11  * General Public License for more details.
 12  *
 13  * You should have received a copy of the GNU General Public
 14  * License along with this program; if not, write to the
 15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 16  * Boston, MA 021110-1307, USA.
 17  */
 18 
 19 #ifndef __DISKIO__
 20 #define __DISKIO__
 21 
 22 #define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
 23 #define BTRFS_SUPER_INFO_SIZE 4096
 24 
 25 #define BTRFS_SUPER_MIRROR_MAX   3
 26 #define BTRFS_SUPER_MIRROR_SHIFT 12
 27 
 28 enum btrfs_wq_endio_type {
 29         BTRFS_WQ_ENDIO_DATA = 0,
 30         BTRFS_WQ_ENDIO_METADATA = 1,
 31         BTRFS_WQ_ENDIO_FREE_SPACE = 2,
 32         BTRFS_WQ_ENDIO_RAID56 = 3,
 33         BTRFS_WQ_ENDIO_DIO_REPAIR = 4,
 34 };
 35 
 36 static inline u64 btrfs_sb_offset(int mirror)
 37 {
 38         u64 start = 16 * 1024;
 39         if (mirror)
 40                 return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
 41         return BTRFS_SUPER_INFO_OFFSET;
 42 }
 43 
 44 struct btrfs_device;
 45 struct btrfs_fs_devices;
 46 
 47 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 48                                       u64 parent_transid);
 49 void readahead_tree_block(struct btrfs_root *root, u64 bytenr);
 50 int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr,
 51                          int mirror_num, struct extent_buffer **eb);
 52 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
 53                                                    u64 bytenr);
 54 void clean_tree_block(struct btrfs_trans_handle *trans,
 55                       struct btrfs_root *root, struct extent_buffer *buf);
 56 int open_ctree(struct super_block *sb,
 57                struct btrfs_fs_devices *fs_devices,
 58                char *options);
 59 void close_ctree(struct btrfs_root *root);
 60 int write_ctree_super(struct btrfs_trans_handle *trans,
 61                       struct btrfs_root *root, int max_mirrors);
 62 struct buffer_head *btrfs_read_dev_super(struct block_device *bdev);
 63 int btrfs_commit_super(struct btrfs_root *root);
 64 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
 65                                             u64 bytenr);
 66 struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
 67                                       struct btrfs_key *location);
 68 int btrfs_init_fs_root(struct btrfs_root *root);
 69 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
 70                          struct btrfs_root *root);
 71 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info);
 72 
 73 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
 74                                      struct btrfs_key *key,
 75                                      bool check_ref);
 76 static inline struct btrfs_root *
 77 btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
 78                            struct btrfs_key *location)
 79 {
 80         return btrfs_get_fs_root(fs_info, location, true);
 81 }
 82 
 83 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
 84 void btrfs_btree_balance_dirty(struct btrfs_root *root);
 85 void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root);
 86 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
 87                                  struct btrfs_root *root);
 88 void btrfs_free_fs_root(struct btrfs_root *root);
 89 
 90 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 91 struct btrfs_root *btrfs_alloc_dummy_root(void);
 92 #endif
 93 
 94 /*
 95  * This function is used to grab the root, and avoid it is freed when we
 96  * access it. But it doesn't ensure that the tree is not dropped.
 97  *
 98  * If you want to ensure the whole tree is safe, you should use
 99  *      fs_info->subvol_srcu
100  */
101 static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
102 {
103         if (atomic_inc_not_zero(&root->refs))
104                 return root;
105         return NULL;
106 }
107 
108 static inline void btrfs_put_fs_root(struct btrfs_root *root)
109 {
110         if (atomic_dec_and_test(&root->refs))
111                 kfree(root);
112 }
113 
114 void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
115 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
116                           int atomic);
117 int btrfs_set_buffer_uptodate(struct extent_buffer *buf);
118 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
119 u32 btrfs_csum_data(char *data, u32 seed, size_t len);
120 void btrfs_csum_final(u32 crc, char *result);
121 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
122                         enum btrfs_wq_endio_type metadata);
123 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
124                         int rw, struct bio *bio, int mirror_num,
125                         unsigned long bio_flags, u64 bio_offset,
126                         extent_submit_bio_hook_t *submit_bio_start,
127                         extent_submit_bio_hook_t *submit_bio_done);
128 unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info);
129 int btrfs_write_tree_block(struct extent_buffer *buf);
130 int btrfs_wait_tree_block_writeback(struct extent_buffer *buf);
131 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
132                              struct btrfs_fs_info *fs_info);
133 int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
134                        struct btrfs_root *root);
135 void btrfs_cleanup_one_transaction(struct btrfs_transaction *trans,
136                                   struct btrfs_root *root);
137 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
138                                      struct btrfs_fs_info *fs_info,
139                                      u64 objectid);
140 int btree_lock_page_hook(struct page *page, void *data,
141                                 void (*flush_fn)(void *));
142 int btrfs_calc_num_tolerated_disk_barrier_failures(
143         struct btrfs_fs_info *fs_info);
144 int __init btrfs_end_io_wq_init(void);
145 void btrfs_end_io_wq_exit(void);
146 
147 #ifdef CONFIG_DEBUG_LOCK_ALLOC
148 void btrfs_init_lockdep(void);
149 void btrfs_set_buffer_lockdep_class(u64 objectid,
150                                     struct extent_buffer *eb, int level);
151 #else
152 static inline void btrfs_init_lockdep(void)
153 { }
154 static inline void btrfs_set_buffer_lockdep_class(u64 objectid,
155                                         struct extent_buffer *eb, int level)
156 {
157 }
158 #endif
159 #endif
160 

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