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nilfs2: cleanup nilfs_clear_inode
[deliverable/linux.git] / fs / nilfs2 / nilfs.h
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RK		 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 "sb.h"
34#include "bmap.h"
35#include "bmap_union.h"
36
37/*
38 * NILFS filesystem version
39 */
40#define NILFS_VERSION "2.0.5"
41
42/*
43 * nilfs inode data in memory
44 */
45struct nilfs_inode_info {
46 __u32 i_flags;
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_dtime;
52 __u32 i_dir_start_lookup;
53 __u64 i_cno; /* check point number for GC inode */
54 struct address_space i_btnode_cache;
55 struct list_head i_dirty; /* List for connecting dirty files */
56
57#ifdef CONFIG_NILFS_XATTR
58 /*
59 * Extended attributes can be read independently of the main file
60 * data. Taking i_sem even when reading would cause contention
61 * between readers of EAs and writers of regular file data, so
62 * instead we synchronize on xattr_sem when reading or changing
63 * EAs.
64 */
65 struct rw_semaphore xattr_sem;
66#endif
67#ifdef CONFIG_NILFS_POSIX_ACL
68 struct posix_acl *i_acl;
69 struct posix_acl *i_default_acl;
70#endif
71 struct buffer_head *i_bh; /* i_bh contains a new or dirty
72 disk inode */
73 struct inode vfs_inode;
74};
75
76static 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
81static inline struct nilfs_inode_info *
82NILFS_BMAP_I(const struct nilfs_bmap *bmap)
83{
84 return container_of((union nilfs_bmap_union *)bmap,
85 struct nilfs_inode_info,
86 i_bmap_union);
87}
88
89static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
90{
91 struct nilfs_inode_info *ii =
92 container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
93 return &ii->vfs_inode;
94}
95
96static inline struct inode *NILFS_AS_I(struct address_space *mapping)
97{
98 return (mapping->host) ? :
99 container_of(mapping, struct inode, i_data);
100}
101
102/*
103 * Dynamic state flags of NILFS on-memory inode (i_state)
104 */
105enum {
106 NILFS_I_NEW = 0, /* Inode is newly created */
107 NILFS_I_DIRTY, /* The file is dirty */
108 NILFS_I_QUEUED, /* inode is in dirty_files list */
109 NILFS_I_BUSY, /* inode is grabbed by a segment
110 constructor */
111 NILFS_I_COLLECTED, /* All dirty blocks are collected */
112 NILFS_I_UPDATED, /* The file has been written back */
113 NILFS_I_INODE_DIRTY, /* write_inode is requested */
114 NILFS_I_BMAP, /* has bmap and btnode_cache */
115 NILFS_I_GCINODE, /* inode for GC, on memory only */
116 NILFS_I_GCDAT, /* shadow DAT, on memory only */
117};
118
119/*
120 * Macros to check inode numbers
121 */
122#define NILFS_MDT_INO_BITS \
123 ((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO | \
124 1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO | \
125 1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO))
126
127#define NILFS_SYS_INO_BITS \
128 ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
129
130#define NILFS_FIRST_INO(sb) (NILFS_SB(sb)->s_nilfs->ns_first_ino)
131
132#define NILFS_MDT_INODE(sb, ino) \
133 ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino))))
134#define NILFS_VALID_INODE(sb, ino) \
135 ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (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 * @ti_garbage: List of inode to be put when releasing semaphore
144 */
145struct nilfs_transaction_info {
146 u32 ti_magic;
147 void *ti_save;
148 /* This should never used. If this happens,
149 one of other filesystems has a bug. */
150 unsigned short ti_flags;
151 unsigned short ti_count;
152 struct list_head ti_garbage;
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 /* Force to construct segment at the
161 end of transaction. */
162#define NILFS_TI_GC 0x0004 /* GC context */
163#define NILFS_TI_COMMIT 0x0008 /* Change happened or not */
164#define NILFS_TI_WRITER 0x0010 /* Constructor context */
165
166
167int nilfs_transaction_begin(struct super_block *,
168 struct nilfs_transaction_info *, int);
169int nilfs_transaction_end(struct super_block *, int);
170
171static inline void nilfs_set_transaction_flag(unsigned int flag)
172{
173 struct nilfs_transaction_info *ti = current->journal_info;
174
175 BUG_ON(!ti);
176 ti->ti_flags |= flag;
177}
178
179static inline int nilfs_test_transaction_flag(unsigned int flag)
180{
181 struct nilfs_transaction_info *ti = current->journal_info;
182
183 if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
184 return 0;
185 return !!(ti->ti_flags & flag);
186}
187
188static inline int nilfs_doing_gc(void)
189{
190 return nilfs_test_transaction_flag(NILFS_TI_GC);
191}
192
193static inline int nilfs_doing_construction(void)
194{
195 return nilfs_test_transaction_flag(NILFS_TI_WRITER);
196}
197
198static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs)
199{
200 return nilfs_doing_gc() ? nilfs->ns_gc_dat : nilfs->ns_dat;
201}
202
203/*
204 * function prototype
205 */
206#ifdef CONFIG_NILFS_POSIX_ACL
207#error "NILFS: not yet supported POSIX ACL"
208extern int nilfs_permission(struct inode *, int, struct nameidata *);
209extern int nilfs_acl_chmod(struct inode *);
210extern int nilfs_init_acl(struct inode *, struct inode *);
211#else
212#define nilfs_permission NULL
213
214static inline int nilfs_acl_chmod(struct inode *inode)
215{
216 return 0;
217}
218
219static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
220{
221 inode->i_mode &= ~current_umask();
222 return 0;
223}
224#endif
225
226#define NILFS_ATIME_DISABLE
227
228/* dir.c */
229extern int nilfs_add_link(struct dentry *, struct inode *);
230extern ino_t nilfs_inode_by_name(struct inode *, struct dentry *);
231extern int nilfs_make_empty(struct inode *, struct inode *);
232extern struct nilfs_dir_entry *
233nilfs_find_entry(struct inode *, struct dentry *, struct page **);
234extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
235extern int nilfs_empty_dir(struct inode *);
236extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
237extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
238 struct page *, struct inode *);
239
240/* file.c */
241extern int nilfs_sync_file(struct file *, struct dentry *, int);
242
243/* ioctl.c */
244int nilfs_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
245long nilfs_compat_ioctl(struct file *, unsigned int, unsigned long);
246int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, void __user *);
247
248/* inode.c */
249extern struct inode *nilfs_new_inode(struct inode *, int);
250extern void nilfs_free_inode(struct inode *);
251extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
252extern void nilfs_set_inode_flags(struct inode *);
253extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
254extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
255extern struct inode *nilfs_iget(struct super_block *, unsigned long);
256extern void nilfs_update_inode(struct inode *, struct buffer_head *);
257extern void nilfs_truncate(struct inode *);
258extern void nilfs_delete_inode(struct inode *);
259extern int nilfs_setattr(struct dentry *, struct iattr *);
260extern int nilfs_load_inode_block(struct nilfs_sb_info *, struct inode *,
261 struct buffer_head **);
262extern int nilfs_inode_dirty(struct inode *);
263extern int nilfs_set_file_dirty(struct nilfs_sb_info *, struct inode *,
264 unsigned);
265extern int nilfs_mark_inode_dirty(struct inode *);
266extern void nilfs_dirty_inode(struct inode *);
267
268/* namei.c */
269extern struct dentry *nilfs_get_parent(struct dentry *);
270
271/* super.c */
272extern struct inode *nilfs_alloc_inode(struct super_block *);
273extern void nilfs_destroy_inode(struct inode *);
274extern void nilfs_error(struct super_block *, const char *, const char *, ...)
275 __attribute__ ((format (printf, 3, 4)));
276extern void nilfs_warning(struct super_block *, const char *, const char *, ...)
277 __attribute__ ((format (printf, 3, 4)));
278extern struct nilfs_super_block *
279nilfs_load_super_block(struct super_block *, struct buffer_head **);
280extern struct nilfs_super_block *
281nilfs_reload_super_block(struct super_block *, struct buffer_head **, int);
282extern int nilfs_store_magic_and_option(struct super_block *,
283 struct nilfs_super_block *, char *);
284extern void nilfs_update_last_segment(struct nilfs_sb_info *, int);
285extern int nilfs_commit_super(struct nilfs_sb_info *);
286extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64);
287extern void nilfs_detach_checkpoint(struct nilfs_sb_info *);
288
289/* gcinode.c */
290int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
291 struct buffer_head **);
292int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
293 struct buffer_head **);
294int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
295int nilfs_init_gccache(struct the_nilfs *);
296void nilfs_destroy_gccache(struct the_nilfs *);
297void nilfs_clear_gcinode(struct inode *);
298struct inode *nilfs_gc_iget(struct the_nilfs *, ino_t, __u64);
299void nilfs_remove_all_gcinode(struct the_nilfs *);
300
301/* gcdat.c */
302int nilfs_init_gcdat_inode(struct the_nilfs *);
303void nilfs_commit_gcdat_inode(struct the_nilfs *);
304void nilfs_clear_gcdat_inode(struct the_nilfs *);
305
306/*
307 * Inodes and files operations
308 */
309extern struct file_operations nilfs_dir_operations;
310extern struct inode_operations nilfs_file_inode_operations;
311extern struct file_operations nilfs_file_operations;
312extern struct address_space_operations nilfs_aops;
313extern struct inode_operations nilfs_dir_inode_operations;
314extern struct inode_operations nilfs_special_inode_operations;
315extern struct inode_operations nilfs_symlink_inode_operations;
316
317/*
318 * filesystem type
319 */
320extern struct file_system_type nilfs_fs_type;
321
322
323#endif /* _NILFS_H */
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