1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* fs/ internal definitions
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 struct super_block;
9 struct file_system_type;
10 struct iomap;
11 struct iomap_ops;
12 struct linux_binprm;
13 struct path;
14 struct mount;
15 struct shrink_control;
16 struct fs_context;
17 struct user_namespace;
18 struct pipe_inode_info;
19
20 /*
21 * block/bdev.c
22 */
23 #ifdef CONFIG_BLOCK
24 extern void __init bdev_cache_init(void);
25
26 extern int __sync_blockdev(struct block_device *bdev, int wait);
27 void iterate_bdevs(void (*)(struct block_device *, void *), void *);
28 void emergency_thaw_bdev(struct super_block *sb);
29 #else
bdev_cache_init(void)30 static inline void bdev_cache_init(void)
31 {
32 }
33
__sync_blockdev(struct block_device * bdev,int wait)34 static inline int __sync_blockdev(struct block_device *bdev, int wait)
35 {
36 return 0;
37 }
iterate_bdevs(void (* f)(struct block_device *,void *),void * arg)38 static inline void iterate_bdevs(void (*f)(struct block_device *, void *),
39 void *arg)
40 {
41 }
emergency_thaw_bdev(struct super_block * sb)42 static inline int emergency_thaw_bdev(struct super_block *sb)
43 {
44 return 0;
45 }
46 #endif /* CONFIG_BLOCK */
47
48 /*
49 * buffer.c
50 */
51 int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
52 get_block_t *get_block, const struct iomap *iomap);
53
54 /*
55 * char_dev.c
56 */
57 extern void __init chrdev_init(void);
58
59 /*
60 * fs_context.c
61 */
62 extern const struct fs_context_operations legacy_fs_context_ops;
63 extern int parse_monolithic_mount_data(struct fs_context *, void *);
64 extern void vfs_clean_context(struct fs_context *fc);
65 extern int finish_clean_context(struct fs_context *fc);
66
67 /*
68 * namei.c
69 */
70 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
71 struct path *path, struct path *root);
72 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
73 const char *, unsigned int, struct path *);
74 int do_rmdir(int dfd, struct filename *name);
75 int do_unlinkat(int dfd, struct filename *name);
76 int may_linkat(struct user_namespace *mnt_userns, struct path *link);
77 int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
78 struct filename *newname, unsigned int flags);
79 int do_mkdirat(int dfd, struct filename *name, umode_t mode);
80 int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
81 int do_linkat(int olddfd, struct filename *old, int newdfd,
82 struct filename *new, int flags);
83
84 /*
85 * namespace.c
86 */
87 extern struct vfsmount *lookup_mnt(const struct path *);
88 extern int finish_automount(struct vfsmount *, struct path *);
89
90 extern int sb_prepare_remount_readonly(struct super_block *);
91
92 extern void __init mnt_init(void);
93
94 extern int __mnt_want_write_file(struct file *);
95 extern void __mnt_drop_write_file(struct file *);
96
97 extern void dissolve_on_fput(struct vfsmount *);
98
99 int path_mount(const char *dev_name, struct path *path,
100 const char *type_page, unsigned long flags, void *data_page);
101 int path_umount(struct path *path, int flags);
102
103 /*
104 * fs_struct.c
105 */
106 extern void chroot_fs_refs(const struct path *, const struct path *);
107
108 /*
109 * file_table.c
110 */
111 extern struct file *alloc_empty_file(int, const struct cred *);
112 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
113
114 /*
115 * super.c
116 */
117 extern int reconfigure_super(struct fs_context *);
118 extern bool trylock_super(struct super_block *sb);
119 struct super_block *user_get_super(dev_t, bool excl);
120 void put_super(struct super_block *sb);
121 extern bool mount_capable(struct fs_context *);
122
123 /*
124 * open.c
125 */
126 struct open_flags {
127 int open_flag;
128 umode_t mode;
129 int acc_mode;
130 int intent;
131 int lookup_flags;
132 };
133 extern struct file *do_filp_open(int dfd, struct filename *pathname,
134 const struct open_flags *op);
135 extern struct file *do_file_open_root(const struct path *,
136 const char *, const struct open_flags *);
137 extern struct open_how build_open_how(int flags, umode_t mode);
138 extern int build_open_flags(const struct open_how *how, struct open_flags *op);
139 extern int __close_fd_get_file(unsigned int fd, struct file **res);
140
141 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
142 int chmod_common(const struct path *path, umode_t mode);
143 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
144 int flag);
145 int chown_common(const struct path *path, uid_t user, gid_t group);
146 extern int vfs_open(const struct path *, struct file *);
147
148 /*
149 * inode.c
150 */
151 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
152 extern void inode_add_lru(struct inode *inode);
153 extern int dentry_needs_remove_privs(struct dentry *dentry);
154
155 /*
156 * fs-writeback.c
157 */
158 extern long get_nr_dirty_inodes(void);
159 extern int invalidate_inodes(struct super_block *, bool);
160
161 /*
162 * dcache.c
163 */
164 extern int d_set_mounted(struct dentry *dentry);
165 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
166 extern struct dentry *d_alloc_cursor(struct dentry *);
167 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
168 extern char *simple_dname(struct dentry *, char *, int);
169 extern void dput_to_list(struct dentry *, struct list_head *);
170 extern void shrink_dentry_list(struct list_head *);
171
172 /*
173 * read_write.c
174 */
175 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
176
177 /*
178 * pipe.c
179 */
180 extern const struct file_operations pipefifo_fops;
181
182 /*
183 * fs_pin.c
184 */
185 extern void group_pin_kill(struct hlist_head *p);
186 extern void mnt_pin_kill(struct mount *m);
187
188 /*
189 * fs/nsfs.c
190 */
191 extern const struct dentry_operations ns_dentry_operations;
192
193 /* direct-io.c: */
194 int sb_init_dio_done_wq(struct super_block *sb);
195
196 /*
197 * fs/stat.c:
198 */
199 int do_statx(int dfd, const char __user *filename, unsigned flags,
200 unsigned int mask, struct statx __user *buffer);
201
202 /*
203 * fs/splice.c:
204 */
205 long splice_file_to_pipe(struct file *in,
206 struct pipe_inode_info *opipe,
207 loff_t *offset,
208 size_t len, unsigned int flags);
209
