1/* SPDX-License-Identifier: GPL-2.0+ */
2/*
3 * NILFS local header file.
4 *
5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Koji Sato and Ryusuke Konishi.
8 */
9
10#ifndef _NILFS_H
11#define _NILFS_H
12
13#include <linux/kernel.h>
14#include <linux/buffer_head.h>
15#include <linux/spinlock.h>
16#include <linux/blkdev.h>
17#include <linux/nilfs2_api.h>
18#include <linux/nilfs2_ondisk.h>
19#include "the_nilfs.h"
20#include "bmap.h"
21
22/**
23 * struct nilfs_inode_info - nilfs inode data in memory
24 * @i_flags: inode flags
25 * @i_state: dynamic state flags
26 * @i_bmap: pointer on i_bmap_data
27 * @i_bmap_data: raw block mapping
28 * @i_xattr: <TODO>
29 * @i_dir_start_lookup: page index of last successful search
30 * @i_cno: checkpoint number for GC inode
31 * @i_assoc_inode: associated inode (B-tree node cache holder or back pointer)
32 * @i_dirty: list for connecting dirty files
33 * @xattr_sem: semaphore for extended attributes processing
34 * @i_bh: buffer contains disk inode
35 * @i_root: root object of the current filesystem tree
36 * @vfs_inode: VFS inode object
37 */
38struct nilfs_inode_info {
39 __u32 i_flags;
40 unsigned long i_state; /* Dynamic state flags */
41 struct nilfs_bmap *i_bmap;
42 struct nilfs_bmap i_bmap_data;
43 __u64 i_xattr; /* sector_t ??? */
44 __u32 i_dir_start_lookup;
45 __u64 i_cno; /* check point number for GC inode */
46 struct inode *i_assoc_inode;
47 struct list_head i_dirty; /* List for connecting dirty files */
48
49#ifdef CONFIG_NILFS_XATTR
50 /*
51 * Extended attributes can be read independently of the main file
52 * data. Taking i_sem even when reading would cause contention
53 * between readers of EAs and writers of regular file data, so
54 * instead we synchronize on xattr_sem when reading or changing
55 * EAs.
56 */
57 struct rw_semaphore xattr_sem;
58#endif
59 struct buffer_head *i_bh; /*
60 * i_bh contains a new or dirty
61 * disk inode.
62 */
63 struct nilfs_root *i_root;
64 struct inode vfs_inode;
65};
66
67static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
68{
69 return container_of(inode, struct nilfs_inode_info, vfs_inode);
70}
71
72static inline struct nilfs_inode_info *
73NILFS_BMAP_I(const struct nilfs_bmap *bmap)
74{
75 return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
76}
77
78/*
79 * Dynamic state flags of NILFS on-memory inode (i_state)
80 */
81enum {
82 NILFS_I_NEW = 0, /* Inode is newly created */
83 NILFS_I_DIRTY, /* The file is dirty */
84 NILFS_I_QUEUED, /* inode is in dirty_files list */
85 NILFS_I_BUSY, /*
86 * Inode is grabbed by a segment
87 * constructor
88 */
89 NILFS_I_COLLECTED, /* All dirty blocks are collected */
90 NILFS_I_UPDATED, /* The file has been written back */
91 NILFS_I_INODE_SYNC, /* dsync is not allowed for inode */
92 NILFS_I_BMAP, /* has bmap and btnode_cache */
93 NILFS_I_GCINODE, /* inode for GC, on memory only */
94 NILFS_I_BTNC, /* inode for btree node cache */
95 NILFS_I_SHADOW, /* inode for shadowed page cache */
96};
97
98/*
99 * commit flags for nilfs_commit_super and nilfs_sync_super
100 */
101enum {
102 NILFS_SB_COMMIT = 0, /* Commit a super block alternately */
103 NILFS_SB_COMMIT_ALL /* Commit both super blocks */
104};
105
106/*
107 * Macros to check inode numbers
108 */
109#define NILFS_MDT_INO_BITS \
110 (BIT(NILFS_DAT_INO) | BIT(NILFS_CPFILE_INO) | \
111 BIT(NILFS_SUFILE_INO) | BIT(NILFS_IFILE_INO) | \
112 BIT(NILFS_ATIME_INO) | BIT(NILFS_SKETCH_INO))
113
114#define NILFS_SYS_INO_BITS (BIT(NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
115
116#define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)
117
118#define NILFS_MDT_INODE(sb, ino) \
119 ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & BIT(ino)))
120#define NILFS_VALID_INODE(sb, ino) \
121 ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & BIT(ino)))
122
123/**
124 * struct nilfs_transaction_info: context information for synchronization
125 * @ti_magic: Magic number
126 * @ti_save: Backup of journal_info field of task_struct
127 * @ti_flags: Flags
128 * @ti_count: Nest level
129 */
130struct nilfs_transaction_info {
131 u32 ti_magic;
132 void *ti_save;
133 /*
134 * This should never be used. If it happens,
135 * one of other filesystems has a bug.
136 */
137 unsigned short ti_flags;
138 unsigned short ti_count;
139};
140
141/* ti_magic */
142#define NILFS_TI_MAGIC 0xd9e392fb
143
144/* ti_flags */
145#define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */
146#define NILFS_TI_SYNC 0x0002 /*
147 * Force to construct segment at the
148 * end of transaction.
149 */
150#define NILFS_TI_GC 0x0004 /* GC context */
151#define NILFS_TI_COMMIT 0x0008 /* Change happened or not */
152#define NILFS_TI_WRITER 0x0010 /* Constructor context */
153
154
155int nilfs_transaction_begin(struct super_block *,
156 struct nilfs_transaction_info *, int);
157int nilfs_transaction_commit(struct super_block *);
158void nilfs_transaction_abort(struct super_block *);
159
160static inline void nilfs_set_transaction_flag(unsigned int flag)
161{
162 struct nilfs_transaction_info *ti = current->journal_info;
163
164 ti->ti_flags |= flag;
165}
166
167static inline int nilfs_test_transaction_flag(unsigned int flag)
168{
169 struct nilfs_transaction_info *ti = current->journal_info;
170
171 if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
172 return 0;
173 return !!(ti->ti_flags & flag);
174}
175
176static inline int nilfs_doing_gc(void)
177{
178 return nilfs_test_transaction_flag(NILFS_TI_GC);
179}
180
181static inline int nilfs_doing_construction(void)
182{
183 return nilfs_test_transaction_flag(NILFS_TI_WRITER);
184}
185
186/*
187 * function prototype
188 */
189#ifdef CONFIG_NILFS_POSIX_ACL
190#error "NILFS: not yet supported POSIX ACL"
191extern int nilfs_acl_chmod(struct inode *);
192extern int nilfs_init_acl(struct inode *, struct inode *);
193#else
194static inline int nilfs_acl_chmod(struct inode *inode)
195{
196 return 0;
197}
198
199static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
200{
201 if (S_ISLNK(inode->i_mode))
202 return 0;
203
204 inode->i_mode &= ~current_umask();
205 return 0;
206}
207#endif
208
209#define NILFS_ATIME_DISABLE
210
211/* Flags that should be inherited by new inodes from their parent. */
212#define NILFS_FL_INHERITED \
213 (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL | \
214 FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\
215 FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL)
216
217/* Mask out flags that are inappropriate for the given type of inode. */
218static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
219{
220 if (S_ISDIR(mode))
221 return flags;
222 else if (S_ISREG(mode))
223 return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL);
224 else
225 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
226}
227
228/* dir.c */
229int nilfs_add_link(struct dentry *, struct inode *);
230ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
231int nilfs_make_empty(struct inode *, struct inode *);
232struct nilfs_dir_entry *nilfs_find_entry(struct inode *, const struct qstr *,
233 struct folio **);
234int nilfs_delete_entry(struct nilfs_dir_entry *, struct folio *);
235int nilfs_empty_dir(struct inode *);
236struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct folio **);
237void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
238 struct folio *, struct inode *);
239
240/* file.c */
241extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);
242
243/* ioctl.c */
244int nilfs_fileattr_get(struct dentry *dentry, struct fileattr *m);
245int nilfs_fileattr_set(struct mnt_idmap *idmap,
246 struct dentry *dentry, struct fileattr *fa);
247long nilfs_ioctl(struct file *, unsigned int, unsigned long);
248long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
249int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
250 void **);
251
252/* inode.c */
253void nilfs_inode_add_blocks(struct inode *inode, int n);
254void nilfs_inode_sub_blocks(struct inode *inode, int n);
255extern struct inode *nilfs_new_inode(struct inode *, umode_t);
256extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
257extern void nilfs_set_inode_flags(struct inode *);
258extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
259void nilfs_write_inode_common(struct inode *inode,
260 struct nilfs_inode *raw_inode);
261struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
262 unsigned long ino);
263struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
264 unsigned long ino);
265struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
266 unsigned long ino);
267extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
268 unsigned long ino, __u64 cno);
269int nilfs_attach_btree_node_cache(struct inode *inode);
270void nilfs_detach_btree_node_cache(struct inode *inode);
271struct inode *nilfs_iget_for_shadow(struct inode *inode);
272extern void nilfs_update_inode(struct inode *, struct buffer_head *, int);
273extern void nilfs_truncate(struct inode *);
274extern void nilfs_evict_inode(struct inode *);
275extern int nilfs_setattr(struct mnt_idmap *, struct dentry *,
276 struct iattr *);
277extern void nilfs_write_failed(struct address_space *mapping, loff_t to);
278int nilfs_permission(struct mnt_idmap *idmap, struct inode *inode,
279 int mask);
280int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
281extern int nilfs_inode_dirty(struct inode *);
282int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty);
283extern int __nilfs_mark_inode_dirty(struct inode *, int);
284extern void nilfs_dirty_inode(struct inode *, int flags);
285int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
286 __u64 start, __u64 len);
287static inline int nilfs_mark_inode_dirty(struct inode *inode)
288{
289 return __nilfs_mark_inode_dirty(inode, I_DIRTY);
290}
291static inline int nilfs_mark_inode_dirty_sync(struct inode *inode)
292{
293 return __nilfs_mark_inode_dirty(inode, I_DIRTY_SYNC);
294}
295
296/* super.c */
297extern struct inode *nilfs_alloc_inode(struct super_block *);
298
299__printf(2, 3)
300void __nilfs_msg(struct super_block *sb, const char *fmt, ...);
301extern __printf(3, 4)
302void __nilfs_error(struct super_block *sb, const char *function,
303 const char *fmt, ...);
304
305#ifdef CONFIG_PRINTK
306
307#define nilfs_msg(sb, level, fmt, ...) \
308 __nilfs_msg(sb, level fmt, ##__VA_ARGS__)
309#define nilfs_error(sb, fmt, ...) \
310 __nilfs_error(sb, __func__, fmt, ##__VA_ARGS__)
311
312#else
313
314#define nilfs_msg(sb, level, fmt, ...) \
315 do { \
316 no_printk(level fmt, ##__VA_ARGS__); \
317 (void)(sb); \
318 } while (0)
319#define nilfs_error(sb, fmt, ...) \
320 do { \
321 no_printk(fmt, ##__VA_ARGS__); \
322 __nilfs_error(sb, "", " "); \
323 } while (0)
324
325#endif /* CONFIG_PRINTK */
326
327#define nilfs_crit(sb, fmt, ...) \
328 nilfs_msg(sb, KERN_CRIT, fmt, ##__VA_ARGS__)
329#define nilfs_err(sb, fmt, ...) \
330 nilfs_msg(sb, KERN_ERR, fmt, ##__VA_ARGS__)
331#define nilfs_warn(sb, fmt, ...) \
332 nilfs_msg(sb, KERN_WARNING, fmt, ##__VA_ARGS__)
333#define nilfs_info(sb, fmt, ...) \
334 nilfs_msg(sb, KERN_INFO, fmt, ##__VA_ARGS__)
335
336extern struct nilfs_super_block *
337nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
338extern int nilfs_store_magic_and_option(struct super_block *,
339 struct nilfs_super_block *, char *);
340extern int nilfs_check_feature_compatibility(struct super_block *,
341 struct nilfs_super_block *);
342extern void nilfs_set_log_cursor(struct nilfs_super_block *,
343 struct the_nilfs *);
344struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
345 int flip);
346int nilfs_commit_super(struct super_block *sb, int flag);
347int nilfs_cleanup_super(struct super_block *sb);
348int nilfs_resize_fs(struct super_block *sb, __u64 newsize);
349int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
350 struct nilfs_root **root);
351int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);
352
353/* gcinode.c */
354int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
355 struct buffer_head **);
356int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
357 struct buffer_head **);
358int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
359int nilfs_init_gcinode(struct inode *inode);
360void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
361
362/* sysfs.c */
363int __init nilfs_sysfs_init(void);
364void nilfs_sysfs_exit(void);
365int nilfs_sysfs_create_device_group(struct super_block *);
366void nilfs_sysfs_delete_device_group(struct the_nilfs *);
367int nilfs_sysfs_create_snapshot_group(struct nilfs_root *);
368void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *);
369
370/*
371 * Inodes and files operations
372 */
373extern const struct file_operations nilfs_dir_operations;
374extern const struct inode_operations nilfs_file_inode_operations;
375extern const struct file_operations nilfs_file_operations;
376extern const struct address_space_operations nilfs_aops;
377extern const struct inode_operations nilfs_dir_inode_operations;
378extern const struct inode_operations nilfs_special_inode_operations;
379extern const struct inode_operations nilfs_symlink_inode_operations;
380
381/*
382 * filesystem type
383 */
384extern struct file_system_type nilfs_fs_type;
385
386
387#endif /* _NILFS_H */
388

source code of linux/fs/nilfs2/nilfs.h