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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 "bmap.h" |
34 | |
35 | /* |
36 | * nilfs inode data in memory |
37 | */ |
38 | struct nilfs_inode_info { |
39 | __u32 i_flags; |
40 | unsigned long i_state; /* Dynamic state flags */ |
41 | struct nilfs_bmap *i_bmap; |
42 | struct nilfs_bmap i_bmap_data; |
43 | __u64 i_xattr; /* sector_t ??? */ |
44 | __u32 i_dir_start_lookup; |
45 | __u64 i_cno; /* check point number for GC inode */ |
46 | struct address_space i_btnode_cache; |
47 | struct list_head i_dirty; /* List for connecting dirty files */ |
48 | |
49 | #ifdef CONFIG_NILFS_XATTR |
50 | /* |
51 | * Extended attributes can be read independently of the main file |
52 | * data. Taking i_sem even when reading would cause contention |
53 | * between readers of EAs and writers of regular file data, so |
54 | * instead we synchronize on xattr_sem when reading or changing |
55 | * EAs. |
56 | */ |
57 | struct rw_semaphore xattr_sem; |
58 | #endif |
59 | struct buffer_head *i_bh; /* i_bh contains a new or dirty |
60 | disk inode */ |
61 | struct nilfs_root *i_root; |
62 | struct inode vfs_inode; |
63 | }; |
64 | |
65 | static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode) |
66 | { |
67 | return container_of(inode, struct nilfs_inode_info, vfs_inode); |
68 | } |
69 | |
70 | static inline struct nilfs_inode_info * |
71 | NILFS_BMAP_I(const struct nilfs_bmap *bmap) |
72 | { |
73 | return container_of(bmap, struct nilfs_inode_info, i_bmap_data); |
74 | } |
75 | |
76 | static inline struct inode *NILFS_BTNC_I(struct address_space *btnc) |
77 | { |
78 | struct nilfs_inode_info *ii = |
79 | container_of(btnc, struct nilfs_inode_info, i_btnode_cache); |
80 | return &ii->vfs_inode; |
81 | } |
82 | |
83 | /* |
84 | * Dynamic state flags of NILFS on-memory inode (i_state) |
85 | */ |
86 | enum { |
87 | NILFS_I_NEW = 0, /* Inode is newly created */ |
88 | NILFS_I_DIRTY, /* The file is dirty */ |
89 | NILFS_I_QUEUED, /* inode is in dirty_files list */ |
90 | NILFS_I_BUSY, /* inode is grabbed by a segment |
91 | constructor */ |
92 | NILFS_I_COLLECTED, /* All dirty blocks are collected */ |
93 | NILFS_I_UPDATED, /* The file has been written back */ |
94 | NILFS_I_INODE_DIRTY, /* write_inode is requested */ |
95 | NILFS_I_BMAP, /* has bmap and btnode_cache */ |
96 | NILFS_I_GCINODE, /* inode for GC, on memory only */ |
97 | }; |
98 | |
99 | /* |
100 | * commit flags for nilfs_commit_super and nilfs_sync_super |
101 | */ |
102 | enum { |
103 | NILFS_SB_COMMIT = 0, /* Commit a super block alternately */ |
104 | NILFS_SB_COMMIT_ALL /* Commit both super blocks */ |
105 | }; |
106 | |
107 | /* |
108 | * Macros to check inode numbers |
109 | */ |
110 | #define NILFS_MDT_INO_BITS \ |
111 | ((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO | \ |
112 | 1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO | \ |
113 | 1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO)) |
114 | |
115 | #define NILFS_SYS_INO_BITS \ |
116 | ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS) |
117 | |
118 | #define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino) |
119 | |
120 | #define NILFS_MDT_INODE(sb, ino) \ |
121 | ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino)))) |
122 | #define NILFS_VALID_INODE(sb, ino) \ |
123 | ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (ino)))) |
124 | |
125 | /** |
126 | * struct nilfs_transaction_info: context information for synchronization |
127 | * @ti_magic: Magic number |
128 | * @ti_save: Backup of journal_info field of task_struct |
129 | * @ti_flags: Flags |
130 | * @ti_count: Nest level |
131 | * @ti_garbage: List of inode to be put when releasing semaphore |
132 | */ |
133 | struct nilfs_transaction_info { |
134 | u32 ti_magic; |
135 | void *ti_save; |
136 | /* This should never used. If this happens, |
137 | one of other filesystems has a bug. */ |
138 | unsigned short ti_flags; |
139 | unsigned short ti_count; |
140 | struct list_head ti_garbage; |
141 | }; |
142 | |
143 | /* ti_magic */ |
144 | #define NILFS_TI_MAGIC 0xd9e392fb |
145 | |
146 | /* ti_flags */ |
147 | #define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */ |
148 | #define NILFS_TI_SYNC 0x0002 /* Force to construct segment at the |
149 | end of transaction. */ |
150 | #define NILFS_TI_GC 0x0004 /* GC context */ |
151 | #define NILFS_TI_COMMIT 0x0008 /* Change happened or not */ |
152 | #define NILFS_TI_WRITER 0x0010 /* Constructor context */ |
153 | |
154 | |
155 | int nilfs_transaction_begin(struct super_block *, |
156 | struct nilfs_transaction_info *, int); |
157 | int nilfs_transaction_commit(struct super_block *); |
158 | void nilfs_transaction_abort(struct super_block *); |
159 | |
160 | static inline void nilfs_set_transaction_flag(unsigned int flag) |
161 | { |
162 | struct nilfs_transaction_info *ti = current->journal_info; |
163 | |
164 | ti->ti_flags |= flag; |
165 | } |
166 | |
167 | static inline int nilfs_test_transaction_flag(unsigned int flag) |
168 | { |
169 | struct nilfs_transaction_info *ti = current->journal_info; |
170 | |
171 | if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC) |
172 | return 0; |
173 | return !!(ti->ti_flags & flag); |
174 | } |
175 | |
176 | static inline int nilfs_doing_gc(void) |
177 | { |
178 | return nilfs_test_transaction_flag(NILFS_TI_GC); |
179 | } |
180 | |
181 | static inline int nilfs_doing_construction(void) |
182 | { |
183 | return nilfs_test_transaction_flag(NILFS_TI_WRITER); |
184 | } |
185 | |
186 | /* |
187 | * function prototype |
188 | */ |
189 | #ifdef CONFIG_NILFS_POSIX_ACL |
190 | #error "NILFS: not yet supported POSIX ACL" |
191 | extern int nilfs_acl_chmod(struct inode *); |
192 | extern int nilfs_init_acl(struct inode *, struct inode *); |
193 | #else |
194 | static inline int nilfs_acl_chmod(struct inode *inode) |
195 | { |
196 | return 0; |
197 | } |
198 | |
199 | static inline int nilfs_init_acl(struct inode *inode, struct inode *dir) |
200 | { |
201 | inode->i_mode &= ~current_umask(); |
202 | return 0; |
203 | } |
204 | #endif |
205 | |
206 | #define NILFS_ATIME_DISABLE |
207 | |
208 | /* Flags that should be inherited by new inodes from their parent. */ |
209 | #define NILFS_FL_INHERITED \ |
210 | (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL | \ |
211 | FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\ |
212 | FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL) |
213 | |
214 | /* Mask out flags that are inappropriate for the given type of inode. */ |
215 | static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags) |
216 | { |
217 | if (S_ISDIR(mode)) |
218 | return flags; |
219 | else if (S_ISREG(mode)) |
220 | return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL); |
221 | else |
222 | return flags & (FS_NODUMP_FL | FS_NOATIME_FL); |
223 | } |
224 | |
225 | /* dir.c */ |
226 | extern int nilfs_add_link(struct dentry *, struct inode *); |
227 | extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *); |
228 | extern int nilfs_make_empty(struct inode *, struct inode *); |
229 | extern struct nilfs_dir_entry * |
230 | nilfs_find_entry(struct inode *, const struct qstr *, struct page **); |
231 | extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *); |
232 | extern int nilfs_empty_dir(struct inode *); |
233 | extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **); |
234 | extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *, |
235 | struct page *, struct inode *); |
236 | |
237 | /* file.c */ |
238 | extern int nilfs_sync_file(struct file *, int); |
239 | |
240 | /* ioctl.c */ |
241 | long nilfs_ioctl(struct file *, unsigned int, unsigned long); |
242 | long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
243 | int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *, |
244 | void **); |
245 | |
246 | /* inode.c */ |
247 | void nilfs_inode_add_blocks(struct inode *inode, int n); |
248 | void nilfs_inode_sub_blocks(struct inode *inode, int n); |
249 | extern struct inode *nilfs_new_inode(struct inode *, int); |
250 | extern void nilfs_free_inode(struct inode *); |
251 | extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int); |
252 | extern void nilfs_set_inode_flags(struct inode *); |
253 | extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *); |
254 | extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int); |
255 | struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root, |
256 | unsigned long ino); |
257 | struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root, |
258 | unsigned long ino); |
259 | struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, |
260 | unsigned long ino); |
261 | extern struct inode *nilfs_iget_for_gc(struct super_block *sb, |
262 | unsigned long ino, __u64 cno); |
263 | extern void nilfs_update_inode(struct inode *, struct buffer_head *); |
264 | extern void nilfs_truncate(struct inode *); |
265 | extern void nilfs_evict_inode(struct inode *); |
266 | extern int nilfs_setattr(struct dentry *, struct iattr *); |
267 | int nilfs_permission(struct inode *inode, int mask, unsigned int flags); |
268 | int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh); |
269 | extern int nilfs_inode_dirty(struct inode *); |
270 | int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty); |
271 | extern int nilfs_mark_inode_dirty(struct inode *); |
272 | extern void nilfs_dirty_inode(struct inode *, int flags); |
273 | int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
274 | __u64 start, __u64 len); |
275 | |
276 | /* super.c */ |
277 | extern struct inode *nilfs_alloc_inode(struct super_block *); |
278 | extern void nilfs_destroy_inode(struct inode *); |
279 | extern void nilfs_error(struct super_block *, const char *, const char *, ...) |
280 | __attribute__ ((format (printf, 3, 4))); |
281 | extern void nilfs_warning(struct super_block *, const char *, const char *, ...) |
282 | __attribute__ ((format (printf, 3, 4))); |
283 | extern struct nilfs_super_block * |
284 | nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **); |
285 | extern int nilfs_store_magic_and_option(struct super_block *, |
286 | struct nilfs_super_block *, char *); |
287 | extern int nilfs_check_feature_compatibility(struct super_block *, |
288 | struct nilfs_super_block *); |
289 | extern void nilfs_set_log_cursor(struct nilfs_super_block *, |
290 | struct the_nilfs *); |
291 | struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, |
292 | int flip); |
293 | int nilfs_commit_super(struct super_block *sb, int flag); |
294 | int nilfs_cleanup_super(struct super_block *sb); |
295 | int nilfs_resize_fs(struct super_block *sb, __u64 newsize); |
296 | int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, |
297 | struct nilfs_root **root); |
298 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno); |
299 | |
300 | /* gcinode.c */ |
301 | int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64, |
302 | struct buffer_head **); |
303 | int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64, |
304 | struct buffer_head **); |
305 | int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *); |
306 | int nilfs_init_gcinode(struct inode *inode); |
307 | void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs); |
308 | |
309 | /* |
310 | * Inodes and files operations |
311 | */ |
312 | extern const struct file_operations nilfs_dir_operations; |
313 | extern const struct inode_operations nilfs_file_inode_operations; |
314 | extern const struct file_operations nilfs_file_operations; |
315 | extern const struct address_space_operations nilfs_aops; |
316 | extern const struct inode_operations nilfs_dir_inode_operations; |
317 | extern const struct inode_operations nilfs_special_inode_operations; |
318 | extern const struct inode_operations nilfs_symlink_inode_operations; |
319 | |
320 | /* |
321 | * filesystem type |
322 | */ |
323 | extern struct file_system_type nilfs_fs_type; |
324 | |
325 | |
326 | #endif /* _NILFS_H */ |
327 |
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