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1 | /* |
2 | * nilfs.h - NILFS local header file. |
3 | * |
4 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
19 | * |
20 | * Written by Koji Sato <koji@osrg.net> |
21 | * Ryusuke Konishi <ryusuke@osrg.net> |
22 | */ |
23 | |
24 | #ifndef _NILFS_H |
25 | #define _NILFS_H |
26 | |
27 | #include <linux/kernel.h> |
28 | #include <linux/buffer_head.h> |
29 | #include <linux/spinlock.h> |
30 | #include <linux/blkdev.h> |
31 | #include <linux/nilfs2_fs.h> |
32 | #include "the_nilfs.h" |
33 | #include "sb.h" |
34 | #include "bmap.h" |
35 | #include "bmap_union.h" |
36 | |
37 | /* |
38 | * nilfs inode data in memory |
39 | */ |
40 | struct nilfs_inode_info { |
41 | __u32 i_flags; |
42 | unsigned long i_state; /* Dynamic state flags */ |
43 | struct nilfs_bmap *i_bmap; |
44 | union nilfs_bmap_union i_bmap_union; |
45 | __u64 i_xattr; /* sector_t ??? */ |
46 | __u32 i_dir_start_lookup; |
47 | __u64 i_cno; /* check point number for GC inode */ |
48 | struct address_space i_btnode_cache; |
49 | struct list_head i_dirty; /* List for connecting dirty files */ |
50 | |
51 | #ifdef CONFIG_NILFS_XATTR |
52 | /* |
53 | * Extended attributes can be read independently of the main file |
54 | * data. Taking i_sem even when reading would cause contention |
55 | * between readers of EAs and writers of regular file data, so |
56 | * instead we synchronize on xattr_sem when reading or changing |
57 | * EAs. |
58 | */ |
59 | struct rw_semaphore xattr_sem; |
60 | #endif |
61 | struct buffer_head *i_bh; /* i_bh contains a new or dirty |
62 | disk inode */ |
63 | struct inode vfs_inode; |
64 | }; |
65 | |
66 | static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode) |
67 | { |
68 | return container_of(inode, struct nilfs_inode_info, vfs_inode); |
69 | } |
70 | |
71 | static inline struct nilfs_inode_info * |
72 | NILFS_BMAP_I(const struct nilfs_bmap *bmap) |
73 | { |
74 | return container_of((union nilfs_bmap_union *)bmap, |
75 | struct nilfs_inode_info, |
76 | i_bmap_union); |
77 | } |
78 | |
79 | static inline struct inode *NILFS_BTNC_I(struct address_space *btnc) |
80 | { |
81 | struct nilfs_inode_info *ii = |
82 | container_of(btnc, struct nilfs_inode_info, i_btnode_cache); |
83 | return &ii->vfs_inode; |
84 | } |
85 | |
86 | static inline struct inode *NILFS_AS_I(struct address_space *mapping) |
87 | { |
88 | return (mapping->host) ? : |
89 | container_of(mapping, struct inode, i_data); |
90 | } |
91 | |
92 | /* |
93 | * Dynamic state flags of NILFS on-memory inode (i_state) |
94 | */ |
95 | enum { |
96 | NILFS_I_NEW = 0, /* Inode is newly created */ |
97 | NILFS_I_DIRTY, /* The file is dirty */ |
98 | NILFS_I_QUEUED, /* inode is in dirty_files list */ |
99 | NILFS_I_BUSY, /* inode is grabbed by a segment |
100 | constructor */ |
101 | NILFS_I_COLLECTED, /* All dirty blocks are collected */ |
102 | NILFS_I_UPDATED, /* The file has been written back */ |
103 | NILFS_I_INODE_DIRTY, /* write_inode is requested */ |
104 | NILFS_I_BMAP, /* has bmap and btnode_cache */ |
105 | NILFS_I_GCINODE, /* inode for GC, on memory only */ |
106 | NILFS_I_GCDAT, /* shadow DAT, on memory only */ |
107 | }; |
108 | |
109 | /* |
110 | * Macros to check inode numbers |
111 | */ |
112 | #define NILFS_MDT_INO_BITS \ |
113 | ((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO | \ |
114 | 1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO | \ |
115 | 1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO)) |
116 | |
117 | #define NILFS_SYS_INO_BITS \ |
118 | ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS) |
119 | |
120 | #define NILFS_FIRST_INO(sb) (NILFS_SB(sb)->s_nilfs->ns_first_ino) |
121 | |
122 | #define NILFS_MDT_INODE(sb, ino) \ |
123 | ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino)))) |
124 | #define NILFS_VALID_INODE(sb, ino) \ |
125 | ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (ino)))) |
126 | |
127 | /** |
128 | * struct nilfs_transaction_info: context information for synchronization |
129 | * @ti_magic: Magic number |
130 | * @ti_save: Backup of journal_info field of task_struct |
131 | * @ti_flags: Flags |
132 | * @ti_count: Nest level |
133 | * @ti_garbage: List of inode to be put when releasing semaphore |
134 | */ |
135 | struct nilfs_transaction_info { |
136 | u32 ti_magic; |
137 | void *ti_save; |
138 | /* This should never used. If this happens, |
139 | one of other filesystems has a bug. */ |
140 | unsigned short ti_flags; |
141 | unsigned short ti_count; |
142 | struct list_head ti_garbage; |
143 | }; |
144 | |
145 | /* ti_magic */ |
146 | #define NILFS_TI_MAGIC 0xd9e392fb |
147 | |
148 | /* ti_flags */ |
149 | #define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */ |
150 | #define NILFS_TI_SYNC 0x0002 /* Force to construct segment at the |
151 | end of transaction. */ |
152 | #define NILFS_TI_GC 0x0004 /* GC context */ |
153 | #define NILFS_TI_COMMIT 0x0008 /* Change happened or not */ |
154 | #define NILFS_TI_WRITER 0x0010 /* Constructor context */ |
155 | |
156 | |
157 | int nilfs_transaction_begin(struct super_block *, |
158 | struct nilfs_transaction_info *, int); |
159 | int nilfs_transaction_commit(struct super_block *); |
160 | void nilfs_transaction_abort(struct super_block *); |
161 | |
162 | static inline void nilfs_set_transaction_flag(unsigned int flag) |
163 | { |
164 | struct nilfs_transaction_info *ti = current->journal_info; |
165 | |
166 | ti->ti_flags |= flag; |
167 | } |
168 | |
169 | static inline int nilfs_test_transaction_flag(unsigned int flag) |
170 | { |
171 | struct nilfs_transaction_info *ti = current->journal_info; |
172 | |
173 | if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC) |
174 | return 0; |
175 | return !!(ti->ti_flags & flag); |
176 | } |
177 | |
178 | static inline int nilfs_doing_gc(void) |
179 | { |
180 | return nilfs_test_transaction_flag(NILFS_TI_GC); |
181 | } |
182 | |
183 | static inline int nilfs_doing_construction(void) |
184 | { |
185 | return nilfs_test_transaction_flag(NILFS_TI_WRITER); |
186 | } |
187 | |
188 | static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs) |
189 | { |
190 | return nilfs_doing_gc() ? nilfs->ns_gc_dat : nilfs->ns_dat; |
191 | } |
192 | |
193 | /* |
194 | * function prototype |
195 | */ |
196 | #ifdef CONFIG_NILFS_POSIX_ACL |
197 | #error "NILFS: not yet supported POSIX ACL" |
198 | extern int nilfs_permission(struct inode *, int, struct nameidata *); |
199 | extern int nilfs_acl_chmod(struct inode *); |
200 | extern int nilfs_init_acl(struct inode *, struct inode *); |
201 | #else |
202 | #define nilfs_permission NULL |
203 | |
204 | static inline int nilfs_acl_chmod(struct inode *inode) |
205 | { |
206 | return 0; |
207 | } |
208 | |
209 | static inline int nilfs_init_acl(struct inode *inode, struct inode *dir) |
210 | { |
211 | inode->i_mode &= ~current_umask(); |
212 | return 0; |
213 | } |
214 | #endif |
215 | |
216 | #define NILFS_ATIME_DISABLE |
217 | |
218 | /* dir.c */ |
219 | extern int nilfs_add_link(struct dentry *, struct inode *); |
220 | extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *); |
221 | extern int nilfs_make_empty(struct inode *, struct inode *); |
222 | extern struct nilfs_dir_entry * |
223 | nilfs_find_entry(struct inode *, const struct qstr *, struct page **); |
224 | extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *); |
225 | extern int nilfs_empty_dir(struct inode *); |
226 | extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **); |
227 | extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *, |
228 | struct page *, struct inode *); |
229 | |
230 | /* file.c */ |
231 | extern int nilfs_sync_file(struct file *, struct dentry *, int); |
232 | |
233 | /* ioctl.c */ |
234 | long nilfs_ioctl(struct file *, unsigned int, unsigned long); |
235 | int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *, |
236 | void **); |
237 | |
238 | /* inode.c */ |
239 | extern struct inode *nilfs_new_inode(struct inode *, int); |
240 | extern void nilfs_free_inode(struct inode *); |
241 | extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int); |
242 | extern void nilfs_set_inode_flags(struct inode *); |
243 | extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *); |
244 | extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int); |
245 | extern struct inode *nilfs_iget(struct super_block *, unsigned long); |
246 | extern void nilfs_update_inode(struct inode *, struct buffer_head *); |
247 | extern void nilfs_truncate(struct inode *); |
248 | extern void nilfs_delete_inode(struct inode *); |
249 | extern int nilfs_setattr(struct dentry *, struct iattr *); |
250 | extern int nilfs_load_inode_block(struct nilfs_sb_info *, struct inode *, |
251 | struct buffer_head **); |
252 | extern int nilfs_inode_dirty(struct inode *); |
253 | extern int nilfs_set_file_dirty(struct nilfs_sb_info *, struct inode *, |
254 | unsigned); |
255 | extern int nilfs_mark_inode_dirty(struct inode *); |
256 | extern void nilfs_dirty_inode(struct inode *); |
257 | |
258 | /* namei.c */ |
259 | extern struct dentry *nilfs_get_parent(struct dentry *); |
260 | |
261 | /* super.c */ |
262 | extern struct inode *nilfs_alloc_inode_common(struct the_nilfs *); |
263 | extern struct inode *nilfs_alloc_inode(struct super_block *); |
264 | extern void nilfs_destroy_inode(struct inode *); |
265 | extern void nilfs_error(struct super_block *, const char *, const char *, ...) |
266 | __attribute__ ((format (printf, 3, 4))); |
267 | extern void nilfs_warning(struct super_block *, const char *, const char *, ...) |
268 | __attribute__ ((format (printf, 3, 4))); |
269 | extern struct nilfs_super_block * |
270 | nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **); |
271 | extern int nilfs_store_magic_and_option(struct super_block *, |
272 | struct nilfs_super_block *, char *); |
273 | extern int nilfs_commit_super(struct nilfs_sb_info *, int); |
274 | extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64); |
275 | extern void nilfs_detach_checkpoint(struct nilfs_sb_info *); |
276 | |
277 | /* gcinode.c */ |
278 | int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64, |
279 | struct buffer_head **); |
280 | int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64, |
281 | struct buffer_head **); |
282 | int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *); |
283 | int nilfs_init_gccache(struct the_nilfs *); |
284 | void nilfs_destroy_gccache(struct the_nilfs *); |
285 | void nilfs_clear_gcinode(struct inode *); |
286 | struct inode *nilfs_gc_iget(struct the_nilfs *, ino_t, __u64); |
287 | void nilfs_remove_all_gcinode(struct the_nilfs *); |
288 | |
289 | /* gcdat.c */ |
290 | int nilfs_init_gcdat_inode(struct the_nilfs *); |
291 | void nilfs_commit_gcdat_inode(struct the_nilfs *); |
292 | void nilfs_clear_gcdat_inode(struct the_nilfs *); |
293 | |
294 | /* |
295 | * Inodes and files operations |
296 | */ |
297 | extern const struct file_operations nilfs_dir_operations; |
298 | extern const struct inode_operations nilfs_file_inode_operations; |
299 | extern const struct file_operations nilfs_file_operations; |
300 | extern const struct address_space_operations nilfs_aops; |
301 | extern const struct inode_operations nilfs_dir_inode_operations; |
302 | extern const struct inode_operations nilfs_special_inode_operations; |
303 | extern const struct inode_operations nilfs_symlink_inode_operations; |
304 | |
305 | /* |
306 | * filesystem type |
307 | */ |
308 | extern struct file_system_type nilfs_fs_type; |
309 | |
310 | |
311 | #endif /* _NILFS_H */ |
312 |
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