2 * nilfs.h - NILFS local header file.
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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.
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.
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
20 * Written by Koji Sato <koji@osrg.net>
21 * Ryusuke Konishi <ryusuke@osrg.net>
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"
36 * struct nilfs_inode_info - nilfs inode data in memory
37 * @i_flags: inode flags
38 * @i_state: dynamic state flags
39 * @i_bmap: pointer on i_bmap_data
40 * @i_bmap_data: raw block mapping
42 * @i_dir_start_lookup: page index of last successful search
43 * @i_cno: checkpoint number for GC inode
44 * @i_btnode_cache: cached pages of b-tree nodes
45 * @i_dirty: list for connecting dirty files
46 * @xattr_sem: semaphore for extended attributes processing
47 * @i_bh: buffer contains disk inode
48 * @i_root: root object of the current filesystem tree
49 * @vfs_inode: VFS inode object
51 struct nilfs_inode_info {
53 unsigned long i_state; /* Dynamic state flags */
54 struct nilfs_bmap *i_bmap;
55 struct nilfs_bmap i_bmap_data;
56 __u64 i_xattr; /* sector_t ??? */
57 __u32 i_dir_start_lookup;
58 __u64 i_cno; /* check point number for GC inode */
59 struct address_space i_btnode_cache;
60 struct list_head i_dirty; /* List for connecting dirty files */
62 #ifdef CONFIG_NILFS_XATTR
64 * Extended attributes can be read independently of the main file
65 * data. Taking i_sem even when reading would cause contention
66 * between readers of EAs and writers of regular file data, so
67 * instead we synchronize on xattr_sem when reading or changing
70 struct rw_semaphore xattr_sem;
72 struct buffer_head *i_bh; /* i_bh contains a new or dirty
74 struct nilfs_root *i_root;
75 struct inode vfs_inode;
78 static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
80 return container_of(inode, struct nilfs_inode_info, vfs_inode);
83 static inline struct nilfs_inode_info *
84 NILFS_BMAP_I(const struct nilfs_bmap *bmap)
86 return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
89 static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
91 struct nilfs_inode_info *ii =
92 container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
93 return &ii->vfs_inode;
97 * Dynamic state flags of NILFS on-memory inode (i_state)
100 NILFS_I_NEW = 0, /* Inode is newly created */
101 NILFS_I_DIRTY, /* The file is dirty */
102 NILFS_I_QUEUED, /* inode is in dirty_files list */
103 NILFS_I_BUSY, /* inode is grabbed by a segment
105 NILFS_I_COLLECTED, /* All dirty blocks are collected */
106 NILFS_I_UPDATED, /* The file has been written back */
107 NILFS_I_INODE_DIRTY, /* write_inode is requested */
108 NILFS_I_BMAP, /* has bmap and btnode_cache */
109 NILFS_I_GCINODE, /* inode for GC, on memory only */
113 * commit flags for nilfs_commit_super and nilfs_sync_super
116 NILFS_SB_COMMIT = 0, /* Commit a super block alternately */
117 NILFS_SB_COMMIT_ALL /* Commit both super blocks */
121 * Macros to check inode numbers
123 #define NILFS_MDT_INO_BITS \
124 ((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO | \
125 1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO | \
126 1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO))
128 #define NILFS_SYS_INO_BITS \
129 ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
131 #define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)
133 #define NILFS_MDT_INODE(sb, ino) \
134 ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino))))
135 #define NILFS_VALID_INODE(sb, ino) \
136 ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (ino))))
139 * struct nilfs_transaction_info: context information for synchronization
140 * @ti_magic: Magic number
141 * @ti_save: Backup of journal_info field of task_struct
143 * @ti_count: Nest level
144 * @ti_garbage: List of inode to be put when releasing semaphore
146 struct nilfs_transaction_info {
149 /* This should never used. If this happens,
150 one of other filesystems has a bug. */
151 unsigned short ti_flags;
152 unsigned short ti_count;
153 struct list_head ti_garbage;
157 #define NILFS_TI_MAGIC 0xd9e392fb
160 #define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */
161 #define NILFS_TI_SYNC 0x0002 /* Force to construct segment at the
162 end of transaction. */
163 #define NILFS_TI_GC 0x0004 /* GC context */
164 #define NILFS_TI_COMMIT 0x0008 /* Change happened or not */
165 #define NILFS_TI_WRITER 0x0010 /* Constructor context */
168 int nilfs_transaction_begin(struct super_block *,
169 struct nilfs_transaction_info *, int);
170 int nilfs_transaction_commit(struct super_block *);
171 void nilfs_transaction_abort(struct super_block *);
173 static inline void nilfs_set_transaction_flag(unsigned int flag)
175 struct nilfs_transaction_info *ti = current->journal_info;
177 ti->ti_flags |= flag;
180 static inline int nilfs_test_transaction_flag(unsigned int flag)
182 struct nilfs_transaction_info *ti = current->journal_info;
184 if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
186 return !!(ti->ti_flags & flag);
189 static inline int nilfs_doing_gc(void)
191 return nilfs_test_transaction_flag(NILFS_TI_GC);
194 static inline int nilfs_doing_construction(void)
196 return nilfs_test_transaction_flag(NILFS_TI_WRITER);
202 #ifdef CONFIG_NILFS_POSIX_ACL
203 #error "NILFS: not yet supported POSIX ACL"
204 extern int nilfs_acl_chmod(struct inode *);
205 extern int nilfs_init_acl(struct inode *, struct inode *);
207 static inline int nilfs_acl_chmod(struct inode *inode)
212 static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
214 inode->i_mode &= ~current_umask();
219 #define NILFS_ATIME_DISABLE
221 /* Flags that should be inherited by new inodes from their parent. */
222 #define NILFS_FL_INHERITED \
223 (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL | \
224 FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\
225 FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL)
227 /* Mask out flags that are inappropriate for the given type of inode. */
228 static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
232 else if (S_ISREG(mode))
233 return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL);
235 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
239 extern int nilfs_add_link(struct dentry *, struct inode *);
240 extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
241 extern int nilfs_make_empty(struct inode *, struct inode *);
242 extern struct nilfs_dir_entry *
243 nilfs_find_entry(struct inode *, const struct qstr *, struct page **);
244 extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
245 extern int nilfs_empty_dir(struct inode *);
246 extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
247 extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
248 struct page *, struct inode *);
251 extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);
254 long nilfs_ioctl(struct file *, unsigned int, unsigned long);
255 long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
256 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
260 void nilfs_inode_add_blocks(struct inode *inode, int n);
261 void nilfs_inode_sub_blocks(struct inode *inode, int n);
262 extern struct inode *nilfs_new_inode(struct inode *, umode_t);
263 extern void nilfs_free_inode(struct inode *);
264 extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
265 extern void nilfs_set_inode_flags(struct inode *);
266 extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
267 extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
268 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
270 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
272 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
274 extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
275 unsigned long ino, __u64 cno);
276 extern void nilfs_update_inode(struct inode *, struct buffer_head *);
277 extern void nilfs_truncate(struct inode *);
278 extern void nilfs_evict_inode(struct inode *);
279 extern int nilfs_setattr(struct dentry *, struct iattr *);
280 int nilfs_permission(struct inode *inode, int mask);
281 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
282 extern int nilfs_inode_dirty(struct inode *);
283 int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty);
284 extern int nilfs_mark_inode_dirty(struct inode *);
285 extern void nilfs_dirty_inode(struct inode *, int flags);
286 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
287 __u64 start, __u64 len);
290 extern struct inode *nilfs_alloc_inode(struct super_block *);
291 extern void nilfs_destroy_inode(struct inode *);
292 extern __printf(3, 4)
293 void nilfs_error(struct super_block *, const char *, const char *, ...);
294 extern __printf(3, 4)
295 void nilfs_warning(struct super_block *, const char *, const char *, ...);
296 extern struct nilfs_super_block *
297 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
298 extern int nilfs_store_magic_and_option(struct super_block *,
299 struct nilfs_super_block *, char *);
300 extern int nilfs_check_feature_compatibility(struct super_block *,
301 struct nilfs_super_block *);
302 extern void nilfs_set_log_cursor(struct nilfs_super_block *,
304 struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
306 int nilfs_commit_super(struct super_block *sb, int flag);
307 int nilfs_cleanup_super(struct super_block *sb);
308 int nilfs_resize_fs(struct super_block *sb, __u64 newsize);
309 int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
310 struct nilfs_root **root);
311 int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);
314 int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
315 struct buffer_head **);
316 int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
317 struct buffer_head **);
318 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
319 int nilfs_init_gcinode(struct inode *inode);
320 void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
323 * Inodes and files operations
325 extern const struct file_operations nilfs_dir_operations;
326 extern const struct inode_operations nilfs_file_inode_operations;
327 extern const struct file_operations nilfs_file_operations;
328 extern const struct address_space_operations nilfs_aops;
329 extern const struct inode_operations nilfs_dir_inode_operations;
330 extern const struct inode_operations nilfs_special_inode_operations;
331 extern const struct inode_operations nilfs_symlink_inode_operations;
336 extern struct file_system_type nilfs_fs_type;
339 #endif /* _NILFS_H */