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Linux/fs/nilfs2/nilfs.h

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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  * Written by Koji Sato and Ryusuke Konishi.
 17  */
 18 
 19 #ifndef _NILFS_H
 20 #define _NILFS_H
 21 
 22 #include <linux/kernel.h>
 23 #include <linux/buffer_head.h>
 24 #include <linux/spinlock.h>
 25 #include <linux/blkdev.h>
 26 #include <linux/nilfs2_api.h>
 27 #include <linux/nilfs2_ondisk.h>
 28 #include "the_nilfs.h"
 29 #include "bmap.h"
 30 
 31 /**
 32  * struct nilfs_inode_info - nilfs inode data in memory
 33  * @i_flags: inode flags
 34  * @i_state: dynamic state flags
 35  * @i_bmap: pointer on i_bmap_data
 36  * @i_bmap_data: raw block mapping
 37  * @i_xattr: <TODO>
 38  * @i_dir_start_lookup: page index of last successful search
 39  * @i_cno: checkpoint number for GC inode
 40  * @i_btnode_cache: cached pages of b-tree nodes
 41  * @i_dirty: list for connecting dirty files
 42  * @xattr_sem: semaphore for extended attributes processing
 43  * @i_bh: buffer contains disk inode
 44  * @i_root: root object of the current filesystem tree
 45  * @vfs_inode: VFS inode object
 46  */
 47 struct nilfs_inode_info {
 48         __u32 i_flags;
 49         unsigned long  i_state;         /* Dynamic state flags */
 50         struct nilfs_bmap *i_bmap;
 51         struct nilfs_bmap i_bmap_data;
 52         __u64 i_xattr;  /* sector_t ??? */
 53         __u32 i_dir_start_lookup;
 54         __u64 i_cno;            /* check point number for GC inode */
 55         struct address_space i_btnode_cache;
 56         struct list_head i_dirty;       /* List for connecting dirty files */
 57 
 58 #ifdef CONFIG_NILFS_XATTR
 59         /*
 60          * Extended attributes can be read independently of the main file
 61          * data. Taking i_sem even when reading would cause contention
 62          * between readers of EAs and writers of regular file data, so
 63          * instead we synchronize on xattr_sem when reading or changing
 64          * EAs.
 65          */
 66         struct rw_semaphore xattr_sem;
 67 #endif
 68         struct buffer_head *i_bh;       /*
 69                                          * i_bh contains a new or dirty
 70                                          * disk inode.
 71                                          */
 72         struct nilfs_root *i_root;
 73         struct inode vfs_inode;
 74 };
 75 
 76 static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
 77 {
 78         return container_of(inode, struct nilfs_inode_info, vfs_inode);
 79 }
 80 
 81 static inline struct nilfs_inode_info *
 82 NILFS_BMAP_I(const struct nilfs_bmap *bmap)
 83 {
 84         return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
 85 }
 86 
 87 static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
 88 {
 89         struct nilfs_inode_info *ii =
 90                 container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
 91         return &ii->vfs_inode;
 92 }
 93 
 94 /*
 95  * Dynamic state flags of NILFS on-memory inode (i_state)
 96  */
 97 enum {
 98         NILFS_I_NEW = 0,                /* Inode is newly created */
 99         NILFS_I_DIRTY,                  /* The file is dirty */
100         NILFS_I_QUEUED,                 /* inode is in dirty_files list */
101         NILFS_I_BUSY,                   /*
102                                          * Inode is grabbed by a segment
103                                          * constructor
104                                          */
105         NILFS_I_COLLECTED,              /* All dirty blocks are collected */
106         NILFS_I_UPDATED,                /* The file has been written back */
107         NILFS_I_INODE_SYNC,             /* dsync is not allowed for inode */
108         NILFS_I_BMAP,                   /* has bmap and btnode_cache */
109         NILFS_I_GCINODE,                /* inode for GC, on memory only */
110 };
111 
112 /*
113  * commit flags for nilfs_commit_super and nilfs_sync_super
114  */
115 enum {
116         NILFS_SB_COMMIT = 0,    /* Commit a super block alternately */
117         NILFS_SB_COMMIT_ALL     /* Commit both super blocks */
118 };
119 
120 /*
121  * Macros to check inode numbers
122  */
123 #define NILFS_MDT_INO_BITS                                              \
124         (BIT(NILFS_DAT_INO) | BIT(NILFS_CPFILE_INO) |                   \
125          BIT(NILFS_SUFILE_INO) | BIT(NILFS_IFILE_INO) |                 \
126          BIT(NILFS_ATIME_INO) | BIT(NILFS_SKETCH_INO))
127 
128 #define NILFS_SYS_INO_BITS (BIT(NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
129 
130 #define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)
131 
132 #define NILFS_MDT_INODE(sb, ino) \
133         ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & BIT(ino)))
134 #define NILFS_VALID_INODE(sb, ino) \
135         ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & BIT(ino)))
136 
137 /**
138  * struct nilfs_transaction_info: context information for synchronization
139  * @ti_magic: Magic number
140  * @ti_save: Backup of journal_info field of task_struct
141  * @ti_flags: Flags
142  * @ti_count: Nest level
143  */
144 struct nilfs_transaction_info {
145         u32                     ti_magic;
146         void                   *ti_save;
147                                 /*
148                                  * This should never be used.  If it happens,
149                                  * one of other filesystems has a bug.
150                                  */
151         unsigned short          ti_flags;
152         unsigned short          ti_count;
153 };
154 
155 /* ti_magic */
156 #define NILFS_TI_MAGIC          0xd9e392fb
157 
158 /* ti_flags */
159 #define NILFS_TI_DYNAMIC_ALLOC  0x0001  /* Allocated from slab */
160 #define NILFS_TI_SYNC           0x0002  /*
161                                          * Force to construct segment at the
162                                          * end of transaction.
163                                          */
164 #define NILFS_TI_GC             0x0004  /* GC context */
165 #define NILFS_TI_COMMIT         0x0008  /* Change happened or not */
166 #define NILFS_TI_WRITER         0x0010  /* Constructor context */
167 
168 
169 int nilfs_transaction_begin(struct super_block *,
170                             struct nilfs_transaction_info *, int);
171 int nilfs_transaction_commit(struct super_block *);
172 void nilfs_transaction_abort(struct super_block *);
173 
174 static inline void nilfs_set_transaction_flag(unsigned int flag)
175 {
176         struct nilfs_transaction_info *ti = current->journal_info;
177 
178         ti->ti_flags |= flag;
179 }
180 
181 static inline int nilfs_test_transaction_flag(unsigned int flag)
182 {
183         struct nilfs_transaction_info *ti = current->journal_info;
184 
185         if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
186                 return 0;
187         return !!(ti->ti_flags & flag);
188 }
189 
190 static inline int nilfs_doing_gc(void)
191 {
192         return nilfs_test_transaction_flag(NILFS_TI_GC);
193 }
194 
195 static inline int nilfs_doing_construction(void)
196 {
197         return nilfs_test_transaction_flag(NILFS_TI_WRITER);
198 }
199 
200 /*
201  * function prototype
202  */
203 #ifdef CONFIG_NILFS_POSIX_ACL
204 #error "NILFS: not yet supported POSIX ACL"
205 extern int nilfs_acl_chmod(struct inode *);
206 extern int nilfs_init_acl(struct inode *, struct inode *);
207 #else
208 static inline int nilfs_acl_chmod(struct inode *inode)
209 {
210         return 0;
211 }
212 
213 static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
214 {
215         inode->i_mode &= ~current_umask();
216         return 0;
217 }
218 #endif
219 
220 #define NILFS_ATIME_DISABLE
221 
222 /* Flags that should be inherited by new inodes from their parent. */
223 #define NILFS_FL_INHERITED                                              \
224         (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL |          \
225          FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\
226          FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL)
227 
228 /* Mask out flags that are inappropriate for the given type of inode. */
229 static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
230 {
231         if (S_ISDIR(mode))
232                 return flags;
233         else if (S_ISREG(mode))
234                 return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL);
235         else
236                 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
237 }
238 
239 /* dir.c */
240 extern int nilfs_add_link(struct dentry *, struct inode *);
241 extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
242 extern int nilfs_make_empty(struct inode *, struct inode *);
243 extern struct nilfs_dir_entry *
244 nilfs_find_entry(struct inode *, const struct qstr *, struct page **);
245 extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
246 extern int nilfs_empty_dir(struct inode *);
247 extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
248 extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
249                            struct page *, struct inode *);
250 
251 /* file.c */
252 extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);
253 
254 /* ioctl.c */
255 long nilfs_ioctl(struct file *, unsigned int, unsigned long);
256 long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
257 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
258                                        void **);
259 
260 /* inode.c */
261 void nilfs_inode_add_blocks(struct inode *inode, int n);
262 void nilfs_inode_sub_blocks(struct inode *inode, int n);
263 extern struct inode *nilfs_new_inode(struct inode *, umode_t);
264 extern void nilfs_free_inode(struct inode *);
265 extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
266 extern void nilfs_set_inode_flags(struct inode *);
267 extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
268 extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
269 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
270                             unsigned long ino);
271 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
272                                 unsigned long ino);
273 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
274                          unsigned long ino);
275 extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
276                                        unsigned long ino, __u64 cno);
277 extern void nilfs_update_inode(struct inode *, struct buffer_head *, int);
278 extern void nilfs_truncate(struct inode *);
279 extern void nilfs_evict_inode(struct inode *);
280 extern int nilfs_setattr(struct dentry *, struct iattr *);
281 extern void nilfs_write_failed(struct address_space *mapping, loff_t to);
282 int nilfs_permission(struct inode *inode, int mask);
283 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
284 extern int nilfs_inode_dirty(struct inode *);
285 int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty);
286 extern int __nilfs_mark_inode_dirty(struct inode *, int);
287 extern void nilfs_dirty_inode(struct inode *, int flags);
288 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
289                  __u64 start, __u64 len);
290 static inline int nilfs_mark_inode_dirty(struct inode *inode)
291 {
292         return __nilfs_mark_inode_dirty(inode, I_DIRTY);
293 }
294 static inline int nilfs_mark_inode_dirty_sync(struct inode *inode)
295 {
296         return __nilfs_mark_inode_dirty(inode, I_DIRTY_SYNC);
297 }
298 
299 /* super.c */
300 extern struct inode *nilfs_alloc_inode(struct super_block *);
301 extern void nilfs_destroy_inode(struct inode *);
302 
303 extern __printf(3, 4)
304 void __nilfs_msg(struct super_block *sb, const char *level,
305                  const char *fmt, ...);
306 extern __printf(3, 4)
307 void __nilfs_error(struct super_block *sb, const char *function,
308                    const char *fmt, ...);
309 
310 #ifdef CONFIG_PRINTK
311 
312 #define nilfs_msg(sb, level, fmt, ...)                                  \
313         __nilfs_msg(sb, level, fmt, ##__VA_ARGS__)
314 #define nilfs_error(sb, fmt, ...)                                       \
315         __nilfs_error(sb, __func__, fmt, ##__VA_ARGS__)
316 
317 #else
318 
319 #define nilfs_msg(sb, level, fmt, ...)                                  \
320         do {                                                            \
321                 no_printk(fmt, ##__VA_ARGS__);                          \
322                 (void)(sb);                                             \
323         } while (0)
324 #define nilfs_error(sb, fmt, ...)                                       \
325         do {                                                            \
326                 no_printk(fmt, ##__VA_ARGS__);                          \
327                 __nilfs_error(sb, "", " ");                             \
328         } while (0)
329 
330 #endif /* CONFIG_PRINTK */
331 
332 extern struct nilfs_super_block *
333 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
334 extern int nilfs_store_magic_and_option(struct super_block *,
335                                         struct nilfs_super_block *, char *);
336 extern int nilfs_check_feature_compatibility(struct super_block *,
337                                              struct nilfs_super_block *);
338 extern void nilfs_set_log_cursor(struct nilfs_super_block *,
339                                  struct the_nilfs *);
340 struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
341                                                int flip);
342 int nilfs_commit_super(struct super_block *sb, int flag);
343 int nilfs_cleanup_super(struct super_block *sb);
344 int nilfs_resize_fs(struct super_block *sb, __u64 newsize);
345 int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
346                             struct nilfs_root **root);
347 int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);
348 
349 /* gcinode.c */
350 int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
351                                    struct buffer_head **);
352 int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
353                                    struct buffer_head **);
354 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
355 int nilfs_init_gcinode(struct inode *inode);
356 void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
357 
358 /* sysfs.c */
359 int __init nilfs_sysfs_init(void);
360 void nilfs_sysfs_exit(void);
361 int nilfs_sysfs_create_device_group(struct super_block *);
362 void nilfs_sysfs_delete_device_group(struct the_nilfs *);
363 int nilfs_sysfs_create_snapshot_group(struct nilfs_root *);
364 void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *);
365 
366 /*
367  * Inodes and files operations
368  */
369 extern const struct file_operations nilfs_dir_operations;
370 extern const struct inode_operations nilfs_file_inode_operations;
371 extern const struct file_operations nilfs_file_operations;
372 extern const struct address_space_operations nilfs_aops;
373 extern const struct inode_operations nilfs_dir_inode_operations;
374 extern const struct inode_operations nilfs_special_inode_operations;
375 extern const struct inode_operations nilfs_symlink_inode_operations;
376 
377 /*
378  * filesystem type
379  */
380 extern struct file_system_type nilfs_fs_type;
381 
382 
383 #endif  /* _NILFS_H */
384 

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