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"
35 #include "bmap_union.h"
38 * NILFS filesystem version
40 #define NILFS_VERSION "2.0.5"
43 * nilfs inode data in memory
45 struct nilfs_inode_info {
47 unsigned long i_state; /* Dynamic state flags */
48 struct nilfs_bmap *i_bmap;
49 union nilfs_bmap_union i_bmap_union;
50 __u64 i_xattr; /* sector_t ??? */
51 __u32 i_dir_start_lookup;
52 __u64 i_cno; /* check point number for GC inode */
53 struct address_space i_btnode_cache;
54 struct list_head i_dirty; /* List for connecting dirty files */
56 #ifdef CONFIG_NILFS_XATTR
58 * Extended attributes can be read independently of the main file
59 * data. Taking i_sem even when reading would cause contention
60 * between readers of EAs and writers of regular file data, so
61 * instead we synchronize on xattr_sem when reading or changing
64 struct rw_semaphore xattr_sem;
66 #ifdef CONFIG_NILFS_POSIX_ACL
67 struct posix_acl *i_acl;
68 struct posix_acl *i_default_acl;
70 struct buffer_head *i_bh; /* i_bh contains a new or dirty
72 struct inode vfs_inode;
75 static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
77 return container_of(inode, struct nilfs_inode_info, vfs_inode);
80 static inline struct nilfs_inode_info *
81 NILFS_BMAP_I(const struct nilfs_bmap *bmap)
83 return container_of((union nilfs_bmap_union *)bmap,
84 struct nilfs_inode_info,
88 static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
90 struct nilfs_inode_info *ii =
91 container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
92 return &ii->vfs_inode;
95 static inline struct inode *NILFS_AS_I(struct address_space *mapping)
97 return (mapping->host) ? :
98 container_of(mapping, struct inode, i_data);
102 * Dynamic state flags of NILFS on-memory inode (i_state)
105 NILFS_I_NEW = 0, /* Inode is newly created */
106 NILFS_I_DIRTY, /* The file is dirty */
107 NILFS_I_QUEUED, /* inode is in dirty_files list */
108 NILFS_I_BUSY, /* inode is grabbed by a segment
110 NILFS_I_COLLECTED, /* All dirty blocks are collected */
111 NILFS_I_UPDATED, /* The file has been written back */
112 NILFS_I_INODE_DIRTY, /* write_inode is requested */
113 NILFS_I_BMAP, /* has bmap and btnode_cache */
114 NILFS_I_GCINODE, /* inode for GC, on memory only */
115 NILFS_I_GCDAT, /* shadow DAT, on memory only */
119 * Macros to check inode numbers
121 #define NILFS_MDT_INO_BITS \
122 ((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO | \
123 1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO | \
124 1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO))
126 #define NILFS_SYS_INO_BITS \
127 ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
129 #define NILFS_FIRST_INO(sb) (NILFS_SB(sb)->s_nilfs->ns_first_ino)
131 #define NILFS_MDT_INODE(sb, ino) \
132 ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino))))
133 #define NILFS_VALID_INODE(sb, ino) \
134 ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (ino))))
137 * struct nilfs_transaction_info: context information for synchronization
138 * @ti_magic: Magic number
139 * @ti_save: Backup of journal_info field of task_struct
141 * @ti_count: Nest level
142 * @ti_garbage: List of inode to be put when releasing semaphore
144 struct nilfs_transaction_info {
147 /* This should never used. If this happens,
148 one of other filesystems has a bug. */
149 unsigned short ti_flags;
150 unsigned short ti_count;
151 struct list_head ti_garbage;
155 #define NILFS_TI_MAGIC 0xd9e392fb
158 #define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */
159 #define NILFS_TI_SYNC 0x0002 /* Force to construct segment at the
160 end of transaction. */
161 #define NILFS_TI_GC 0x0004 /* GC context */
162 #define NILFS_TI_COMMIT 0x0008 /* Change happened or not */
163 #define NILFS_TI_WRITER 0x0010 /* Constructor context */
166 int nilfs_transaction_begin(struct super_block *,
167 struct nilfs_transaction_info *, int);
168 int nilfs_transaction_commit(struct super_block *);
169 void nilfs_transaction_abort(struct super_block *);
171 static inline void nilfs_set_transaction_flag(unsigned int flag)
173 struct nilfs_transaction_info *ti = current->journal_info;
175 ti->ti_flags |= flag;
178 static inline int nilfs_test_transaction_flag(unsigned int flag)
180 struct nilfs_transaction_info *ti = current->journal_info;
182 if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
184 return !!(ti->ti_flags & flag);
187 static inline int nilfs_doing_gc(void)
189 return nilfs_test_transaction_flag(NILFS_TI_GC);
192 static inline int nilfs_doing_construction(void)
194 return nilfs_test_transaction_flag(NILFS_TI_WRITER);
197 static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs)
199 return nilfs_doing_gc() ? nilfs->ns_gc_dat : nilfs->ns_dat;
205 #ifdef CONFIG_NILFS_POSIX_ACL
206 #error "NILFS: not yet supported POSIX ACL"
207 extern int nilfs_permission(struct inode *, int, struct nameidata *);
208 extern int nilfs_acl_chmod(struct inode *);
209 extern int nilfs_init_acl(struct inode *, struct inode *);
211 #define nilfs_permission NULL
213 static inline int nilfs_acl_chmod(struct inode *inode)
218 static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
220 inode->i_mode &= ~current_umask();
225 #define NILFS_ATIME_DISABLE
228 extern int nilfs_add_link(struct dentry *, struct inode *);
229 extern ino_t nilfs_inode_by_name(struct inode *, struct dentry *);
230 extern int nilfs_make_empty(struct inode *, struct inode *);
231 extern struct nilfs_dir_entry *
232 nilfs_find_entry(struct inode *, struct dentry *, struct page **);
233 extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
234 extern int nilfs_empty_dir(struct inode *);
235 extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
236 extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
237 struct page *, struct inode *);
240 extern int nilfs_sync_file(struct file *, struct dentry *, int);
243 long nilfs_ioctl(struct file *, unsigned int, unsigned long);
244 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, void __user *);
247 extern struct inode *nilfs_new_inode(struct inode *, int);
248 extern void nilfs_free_inode(struct inode *);
249 extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
250 extern void nilfs_set_inode_flags(struct inode *);
251 extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
252 extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
253 extern struct inode *nilfs_iget(struct super_block *, unsigned long);
254 extern void nilfs_update_inode(struct inode *, struct buffer_head *);
255 extern void nilfs_truncate(struct inode *);
256 extern void nilfs_delete_inode(struct inode *);
257 extern int nilfs_setattr(struct dentry *, struct iattr *);
258 extern int nilfs_load_inode_block(struct nilfs_sb_info *, struct inode *,
259 struct buffer_head **);
260 extern int nilfs_inode_dirty(struct inode *);
261 extern int nilfs_set_file_dirty(struct nilfs_sb_info *, struct inode *,
263 extern int nilfs_mark_inode_dirty(struct inode *);
264 extern void nilfs_dirty_inode(struct inode *);
267 extern struct dentry *nilfs_get_parent(struct dentry *);
270 extern struct inode *nilfs_alloc_inode(struct super_block *);
271 extern void nilfs_destroy_inode(struct inode *);
272 extern void nilfs_error(struct super_block *, const char *, const char *, ...)
273 __attribute__ ((format (printf, 3, 4)));
274 extern void nilfs_warning(struct super_block *, const char *, const char *, ...)
275 __attribute__ ((format (printf, 3, 4)));
276 extern struct nilfs_super_block *
277 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
278 extern int nilfs_store_magic_and_option(struct super_block *,
279 struct nilfs_super_block *, char *);
280 extern int nilfs_commit_super(struct nilfs_sb_info *, int);
281 extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64);
282 extern void nilfs_detach_checkpoint(struct nilfs_sb_info *);
285 int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
286 struct buffer_head **);
287 int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
288 struct buffer_head **);
289 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
290 int nilfs_init_gccache(struct the_nilfs *);
291 void nilfs_destroy_gccache(struct the_nilfs *);
292 void nilfs_clear_gcinode(struct inode *);
293 struct inode *nilfs_gc_iget(struct the_nilfs *, ino_t, __u64);
294 void nilfs_remove_all_gcinode(struct the_nilfs *);
297 int nilfs_init_gcdat_inode(struct the_nilfs *);
298 void nilfs_commit_gcdat_inode(struct the_nilfs *);
299 void nilfs_clear_gcdat_inode(struct the_nilfs *);
302 * Inodes and files operations
304 extern struct file_operations nilfs_dir_operations;
305 extern struct inode_operations nilfs_file_inode_operations;
306 extern struct file_operations nilfs_file_operations;
307 extern struct address_space_operations nilfs_aops;
308 extern struct inode_operations nilfs_dir_inode_operations;
309 extern struct inode_operations nilfs_special_inode_operations;
310 extern struct inode_operations nilfs_symlink_inode_operations;
315 extern struct file_system_type nilfs_fs_type;
318 #endif /* _NILFS_H */