1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * NILFS local header file.
4 *
5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Koji Sato and Ryusuke Konishi.
8 */
9
10 #ifndef _NILFS_H
11 #define _NILFS_H
12
13 #include <linux/kernel.h>
14 #include <linux/buffer_head.h>
15 #include <linux/spinlock.h>
16 #include <linux/blkdev.h>
17 #include <linux/nilfs2_api.h>
18 #include <linux/nilfs2_ondisk.h>
19 #include "the_nilfs.h"
20 #include "bmap.h"
21
22 /**
23 * struct nilfs_inode_info - nilfs inode data in memory
24 * @i_flags: inode flags
25 * @i_state: dynamic state flags
26 * @i_bmap: pointer on i_bmap_data
27 * @i_bmap_data: raw block mapping
28 * @i_xattr: <TODO>
29 * @i_dir_start_lookup: page index of last successful search
30 * @i_cno: checkpoint number for GC inode
31 * @i_assoc_inode: associated inode (B-tree node cache holder or back pointer)
32 * @i_dirty: list for connecting dirty files
33 * @xattr_sem: semaphore for extended attributes processing
34 * @i_bh: buffer contains disk inode
35 * @i_root: root object of the current filesystem tree
36 * @vfs_inode: VFS inode object
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 inode *i_assoc_inode;
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; /*
60 * i_bh contains a new or dirty
61 * disk inode.
62 */
63 struct nilfs_root *i_root;
64 struct inode vfs_inode;
65 };
66
NILFS_I(const struct inode * inode)67 static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
68 {
69 return container_of(inode, struct nilfs_inode_info, vfs_inode);
70 }
71
72 static inline struct nilfs_inode_info *
NILFS_BMAP_I(const struct nilfs_bmap * bmap)73 NILFS_BMAP_I(const struct nilfs_bmap *bmap)
74 {
75 return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
76 }
77
78 /*
79 * Dynamic state flags of NILFS on-memory inode (i_state)
80 */
81 enum {
82 NILFS_I_NEW = 0, /* Inode is newly created */
83 NILFS_I_DIRTY, /* The file is dirty */
84 NILFS_I_QUEUED, /* inode is in dirty_files list */
85 NILFS_I_BUSY, /*
86 * Inode is grabbed by a segment
87 * constructor
88 */
89 NILFS_I_COLLECTED, /* All dirty blocks are collected */
90 NILFS_I_UPDATED, /* The file has been written back */
91 NILFS_I_INODE_SYNC, /* dsync is not allowed for inode */
92 NILFS_I_BMAP, /* has bmap and btnode_cache */
93 NILFS_I_GCINODE, /* inode for GC, on memory only */
94 NILFS_I_BTNC, /* inode for btree node cache */
95 NILFS_I_SHADOW, /* inode for shadowed page cache */
96 };
97
98 /*
99 * commit flags for nilfs_commit_super and nilfs_sync_super
100 */
101 enum {
102 NILFS_SB_COMMIT = 0, /* Commit a super block alternately */
103 NILFS_SB_COMMIT_ALL /* Commit both super blocks */
104 };
105
106 /*
107 * Macros to check inode numbers
108 */
109 #define NILFS_MDT_INO_BITS \
110 (BIT(NILFS_DAT_INO) | BIT(NILFS_CPFILE_INO) | \
111 BIT(NILFS_SUFILE_INO) | BIT(NILFS_IFILE_INO) | \
112 BIT(NILFS_ATIME_INO) | BIT(NILFS_SKETCH_INO))
113
114 #define NILFS_SYS_INO_BITS (BIT(NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
115
116 #define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)
117
118 #define NILFS_MDT_INODE(sb, ino) \
119 ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & BIT(ino)))
120 #define NILFS_VALID_INODE(sb, ino) \
121 ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & BIT(ino)))
122
123 /**
124 * struct nilfs_transaction_info: context information for synchronization
125 * @ti_magic: Magic number
126 * @ti_save: Backup of journal_info field of task_struct
127 * @ti_flags: Flags
128 * @ti_count: Nest level
129 */
130 struct nilfs_transaction_info {
131 u32 ti_magic;
132 void *ti_save;
133 /*
134 * This should never be used. If it happens,
135 * one of other filesystems has a bug.
136 */
137 unsigned short ti_flags;
138 unsigned short ti_count;
139 };
140
141 /* ti_magic */
142 #define NILFS_TI_MAGIC 0xd9e392fb
143
144 /* ti_flags */
145 #define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */
146 #define NILFS_TI_SYNC 0x0002 /*
147 * Force to construct segment at the
148 * end of transaction.
149 */
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
nilfs_set_transaction_flag(unsigned int flag)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
nilfs_test_transaction_flag(unsigned int flag)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
nilfs_doing_gc(void)176 static inline int nilfs_doing_gc(void)
177 {
178 return nilfs_test_transaction_flag(NILFS_TI_GC);
179 }
180
nilfs_doing_construction(void)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
nilfs_acl_chmod(struct inode * inode)194 static inline int nilfs_acl_chmod(struct inode *inode)
195 {
196 return 0;
197 }
198
nilfs_init_acl(struct inode * inode,struct inode * dir)199 static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
200 {
201 if (S_ISLNK(inode->i_mode))
202 return 0;
203
204 inode->i_mode &= ~current_umask();
205 return 0;
206 }
207 #endif
208
209 #define NILFS_ATIME_DISABLE
210
211 /* Flags that should be inherited by new inodes from their parent. */
212 #define NILFS_FL_INHERITED \
213 (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL | \
214 FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\
215 FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL)
216
217 /* Mask out flags that are inappropriate for the given type of inode. */
nilfs_mask_flags(umode_t mode,__u32 flags)218 static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
219 {
220 if (S_ISDIR(mode))
221 return flags;
222 else if (S_ISREG(mode))
223 return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL);
224 else
225 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
226 }
227
228 /* dir.c */
229 extern int nilfs_add_link(struct dentry *, struct inode *);
230 extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
231 extern int nilfs_make_empty(struct inode *, struct inode *);
232 extern struct nilfs_dir_entry *
233 nilfs_find_entry(struct inode *, const struct qstr *, struct page **);
234 extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
235 extern int nilfs_empty_dir(struct inode *);
236 extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
237 extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
238 struct page *, struct inode *);
239
240 /* file.c */
241 extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);
242
243 /* ioctl.c */
244 int nilfs_fileattr_get(struct dentry *dentry, struct fileattr *m);
245 int nilfs_fileattr_set(struct user_namespace *mnt_userns,
246 struct dentry *dentry, struct fileattr *fa);
247 long nilfs_ioctl(struct file *, unsigned int, unsigned long);
248 long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
249 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
250 void **);
251
252 /* inode.c */
253 void nilfs_inode_add_blocks(struct inode *inode, int n);
254 void nilfs_inode_sub_blocks(struct inode *inode, int n);
255 extern struct inode *nilfs_new_inode(struct inode *, umode_t);
256 extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
257 extern void nilfs_set_inode_flags(struct inode *);
258 extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
259 extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
260 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
261 unsigned long ino);
262 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
263 unsigned long ino);
264 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
265 unsigned long ino);
266 extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
267 unsigned long ino, __u64 cno);
268 int nilfs_attach_btree_node_cache(struct inode *inode);
269 void nilfs_detach_btree_node_cache(struct inode *inode);
270 struct inode *nilfs_iget_for_shadow(struct inode *inode);
271 extern void nilfs_update_inode(struct inode *, struct buffer_head *, int);
272 extern void nilfs_truncate(struct inode *);
273 extern void nilfs_evict_inode(struct inode *);
274 extern int nilfs_setattr(struct user_namespace *, struct dentry *,
275 struct iattr *);
276 extern void nilfs_write_failed(struct address_space *mapping, loff_t to);
277 int nilfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
278 int mask);
279 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
280 extern int nilfs_inode_dirty(struct inode *);
281 int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty);
282 extern int __nilfs_mark_inode_dirty(struct inode *, int);
283 extern void nilfs_dirty_inode(struct inode *, int flags);
284 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
285 __u64 start, __u64 len);
nilfs_mark_inode_dirty(struct inode * inode)286 static inline int nilfs_mark_inode_dirty(struct inode *inode)
287 {
288 return __nilfs_mark_inode_dirty(inode, I_DIRTY);
289 }
nilfs_mark_inode_dirty_sync(struct inode * inode)290 static inline int nilfs_mark_inode_dirty_sync(struct inode *inode)
291 {
292 return __nilfs_mark_inode_dirty(inode, I_DIRTY_SYNC);
293 }
294
295 /* super.c */
296 extern struct inode *nilfs_alloc_inode(struct super_block *);
297
298 __printf(2, 3)
299 void __nilfs_msg(struct super_block *sb, const char *fmt, ...);
300 extern __printf(3, 4)
301 void __nilfs_error(struct super_block *sb, const char *function,
302 const char *fmt, ...);
303
304 #ifdef CONFIG_PRINTK
305
306 #define nilfs_msg(sb, level, fmt, ...) \
307 __nilfs_msg(sb, level fmt, ##__VA_ARGS__)
308 #define nilfs_error(sb, fmt, ...) \
309 __nilfs_error(sb, __func__, fmt, ##__VA_ARGS__)
310
311 #else
312
313 #define nilfs_msg(sb, level, fmt, ...) \
314 do { \
315 no_printk(level fmt, ##__VA_ARGS__); \
316 (void)(sb); \
317 } while (0)
318 #define nilfs_error(sb, fmt, ...) \
319 do { \
320 no_printk(fmt, ##__VA_ARGS__); \
321 __nilfs_error(sb, "", " "); \
322 } while (0)
323
324 #endif /* CONFIG_PRINTK */
325
326 #define nilfs_crit(sb, fmt, ...) \
327 nilfs_msg(sb, KERN_CRIT, fmt, ##__VA_ARGS__)
328 #define nilfs_err(sb, fmt, ...) \
329 nilfs_msg(sb, KERN_ERR, fmt, ##__VA_ARGS__)
330 #define nilfs_warn(sb, fmt, ...) \
331 nilfs_msg(sb, KERN_WARNING, fmt, ##__VA_ARGS__)
332 #define nilfs_info(sb, fmt, ...) \
333 nilfs_msg(sb, KERN_INFO, fmt, ##__VA_ARGS__)
334
335 extern struct nilfs_super_block *
336 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
337 extern int nilfs_store_magic_and_option(struct super_block *,
338 struct nilfs_super_block *, char *);
339 extern int nilfs_check_feature_compatibility(struct super_block *,
340 struct nilfs_super_block *);
341 extern void nilfs_set_log_cursor(struct nilfs_super_block *,
342 struct the_nilfs *);
343 struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
344 int flip);
345 int nilfs_commit_super(struct super_block *sb, int flag);
346 int nilfs_cleanup_super(struct super_block *sb);
347 int nilfs_resize_fs(struct super_block *sb, __u64 newsize);
348 int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
349 struct nilfs_root **root);
350 int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);
351
352 /* gcinode.c */
353 int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
354 struct buffer_head **);
355 int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
356 struct buffer_head **);
357 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
358 int nilfs_init_gcinode(struct inode *inode);
359 void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
360
361 /* sysfs.c */
362 int __init nilfs_sysfs_init(void);
363 void nilfs_sysfs_exit(void);
364 int nilfs_sysfs_create_device_group(struct super_block *);
365 void nilfs_sysfs_delete_device_group(struct the_nilfs *);
366 int nilfs_sysfs_create_snapshot_group(struct nilfs_root *);
367 void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *);
368
369 /*
370 * Inodes and files operations
371 */
372 extern const struct file_operations nilfs_dir_operations;
373 extern const struct inode_operations nilfs_file_inode_operations;
374 extern const struct file_operations nilfs_file_operations;
375 extern const struct address_space_operations nilfs_aops;
376 extern const struct inode_operations nilfs_dir_inode_operations;
377 extern const struct inode_operations nilfs_special_inode_operations;
378 extern const struct inode_operations nilfs_symlink_inode_operations;
379
380 /*
381 * filesystem type
382 */
383 extern struct file_system_type nilfs_fs_type;
384
385
386 #endif /* _NILFS_H */
387