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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 * 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_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 */
55
56#ifdef CONFIG_NILFS_XATTR
57 /*
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
62 * EAs.
63 */
64 struct rw_semaphore xattr_sem;
65#endif
66#ifdef CONFIG_NILFS_POSIX_ACL
67 struct posix_acl *i_acl;
68 struct posix_acl *i_default_acl;
69#endif
70 struct buffer_head *i_bh; /* i_bh contains a new or dirty
71 disk inode */
72 struct inode vfs_inode;
73};
74
75static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
76{
77 return container_of(inode, struct nilfs_inode_info, vfs_inode);
78}
79
80static inline struct nilfs_inode_info *
81NILFS_BMAP_I(const struct nilfs_bmap *bmap)
82{
83 return container_of((union nilfs_bmap_union *)bmap,
84 struct nilfs_inode_info,
85 i_bmap_union);
86}
87
88static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
89{
90 struct nilfs_inode_info *ii =
91 container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
92 return &ii->vfs_inode;
93}
94
95static inline struct inode *NILFS_AS_I(struct address_space *mapping)
96{
97 return (mapping->host) ? :
98 container_of(mapping, struct inode, i_data);
99}
100
101/*
102 * Dynamic state flags of NILFS on-memory inode (i_state)
103 */
104enum {
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
109 constructor */
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 */
116};
117
118/*
119 * Macros to check inode numbers
120 */
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))
125
126#define NILFS_SYS_INO_BITS \
127 ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
128
129#define NILFS_FIRST_INO(sb) (NILFS_SB(sb)->s_nilfs->ns_first_ino)
130
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))))
135
136/**
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
140 * @ti_flags: Flags
141 * @ti_count: Nest level
142 * @ti_garbage: List of inode to be put when releasing semaphore
143 */
144struct nilfs_transaction_info {
145 u32 ti_magic;
146 void *ti_save;
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;
152};
153
154/* ti_magic */
155#define NILFS_TI_MAGIC 0xd9e392fb
156
157/* ti_flags */
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 */
164
165
166int nilfs_transaction_begin(struct super_block *,
167 struct nilfs_transaction_info *, int);
168int nilfs_transaction_commit(struct super_block *);
169void nilfs_transaction_abort(struct super_block *);
170
171static inline void nilfs_set_transaction_flag(unsigned int flag)
172{
173 struct nilfs_transaction_info *ti = current->journal_info;
174
175 ti->ti_flags |= flag;
176}
177
178static inline int nilfs_test_transaction_flag(unsigned int flag)
179{
180 struct nilfs_transaction_info *ti = current->journal_info;
181
182 if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
183 return 0;
184 return !!(ti->ti_flags & flag);
185}
186
187static inline int nilfs_doing_gc(void)
188{
189 return nilfs_test_transaction_flag(NILFS_TI_GC);
190}
191
192static inline int nilfs_doing_construction(void)
193{
194 return nilfs_test_transaction_flag(NILFS_TI_WRITER);
195}
196
197static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs)
198{
199 return nilfs_doing_gc() ? nilfs->ns_gc_dat : nilfs->ns_dat;
200}
201
202/*
203 * function prototype
204 */
205#ifdef CONFIG_NILFS_POSIX_ACL
206#error "NILFS: not yet supported POSIX ACL"
207extern int nilfs_permission(struct inode *, int, struct nameidata *);
208extern int nilfs_acl_chmod(struct inode *);
209extern int nilfs_init_acl(struct inode *, struct inode *);
210#else
211#define nilfs_permission NULL
212
213static inline int nilfs_acl_chmod(struct inode *inode)
214{
215 return 0;
216}
217
218static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
219{
220 inode->i_mode &= ~current_umask();
221 return 0;
222}
223#endif
224
225#define NILFS_ATIME_DISABLE
226
227/* dir.c */
228extern int nilfs_add_link(struct dentry *, struct inode *);
229extern ino_t nilfs_inode_by_name(struct inode *, struct dentry *);
230extern int nilfs_make_empty(struct inode *, struct inode *);
231extern struct nilfs_dir_entry *
232nilfs_find_entry(struct inode *, struct dentry *, struct page **);
233extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
234extern int nilfs_empty_dir(struct inode *);
235extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
236extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
237 struct page *, struct inode *);
238
239/* file.c */
240extern int nilfs_sync_file(struct file *, struct dentry *, int);
241
242/* ioctl.c */
243long nilfs_ioctl(struct file *, unsigned int, unsigned long);
244int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, void __user *);
245
246/* inode.c */
247extern struct inode *nilfs_new_inode(struct inode *, int);
248extern void nilfs_free_inode(struct inode *);
249extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
250extern void nilfs_set_inode_flags(struct inode *);
251extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
252extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
253extern struct inode *nilfs_iget(struct super_block *, unsigned long);
254extern void nilfs_update_inode(struct inode *, struct buffer_head *);
255extern void nilfs_truncate(struct inode *);
256extern void nilfs_delete_inode(struct inode *);
257extern int nilfs_setattr(struct dentry *, struct iattr *);
258extern int nilfs_load_inode_block(struct nilfs_sb_info *, struct inode *,
259 struct buffer_head **);
260extern int nilfs_inode_dirty(struct inode *);
261extern int nilfs_set_file_dirty(struct nilfs_sb_info *, struct inode *,
262 unsigned);
263extern int nilfs_mark_inode_dirty(struct inode *);
264extern void nilfs_dirty_inode(struct inode *);
265
266/* namei.c */
267extern struct dentry *nilfs_get_parent(struct dentry *);
268
269/* super.c */
270extern struct inode *nilfs_alloc_inode(struct super_block *);
271extern void nilfs_destroy_inode(struct inode *);
272extern void nilfs_error(struct super_block *, const char *, const char *, ...)
273 __attribute__ ((format (printf, 3, 4)));
274extern void nilfs_warning(struct super_block *, const char *, const char *, ...)
275 __attribute__ ((format (printf, 3, 4)));
276extern struct nilfs_super_block *
277nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
278extern int nilfs_store_magic_and_option(struct super_block *,
279 struct nilfs_super_block *, char *);
280extern int nilfs_commit_super(struct nilfs_sb_info *, int);
281extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64);
282extern void nilfs_detach_checkpoint(struct nilfs_sb_info *);
283
284/* gcinode.c */
285int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
286 struct buffer_head **);
287int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
288 struct buffer_head **);
289int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
290int nilfs_init_gccache(struct the_nilfs *);
291void nilfs_destroy_gccache(struct the_nilfs *);
292void nilfs_clear_gcinode(struct inode *);
293struct inode *nilfs_gc_iget(struct the_nilfs *, ino_t, __u64);
294void nilfs_remove_all_gcinode(struct the_nilfs *);
295
296/* gcdat.c */
297int nilfs_init_gcdat_inode(struct the_nilfs *);
298void nilfs_commit_gcdat_inode(struct the_nilfs *);
299void nilfs_clear_gcdat_inode(struct the_nilfs *);
300
301/*
302 * Inodes and files operations
303 */
304extern struct file_operations nilfs_dir_operations;
305extern struct inode_operations nilfs_file_inode_operations;
306extern struct file_operations nilfs_file_operations;
307extern struct address_space_operations nilfs_aops;
308extern struct inode_operations nilfs_dir_inode_operations;
309extern struct inode_operations nilfs_special_inode_operations;
310extern struct inode_operations nilfs_symlink_inode_operations;
311
312/*
313 * filesystem type
314 */
315extern struct file_system_type nilfs_fs_type;
316
317
318#endif /* _NILFS_H */
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-04 03:42:16 -0500