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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_dev.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
30 static inline void bdev_cache_init(void)
31 {
32 }
33
34 static inline int __sync_blockdev(struct block_device *bdev, int wait)
35 {
36 return 0;
37 }
38 static inline void iterate_bdevs(void (*f)(struct block_device *, void *),
39 void *arg)
40 {
41 }
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 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
52 get_block_t *get_block, 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 fc_drop_locked(struct fs_context *);
65 extern void vfs_clean_context(struct fs_context *fc);
66 extern int finish_clean_context(struct fs_context *fc);
67
68 /*
69 * namei.c
70 */
71 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
72 struct path *path, struct path *root);
73 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
74 const char *, unsigned int, struct path *);
75 long do_rmdir(int dfd, struct filename *name);
76 long do_unlinkat(int dfd, struct filename *name);
77 int may_linkat(struct user_namespace *mnt_userns, struct path *link);
78 int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
79 struct filename *newname, unsigned int flags);
80
81 /*
82 * namespace.c
83 */
84 extern struct vfsmount *lookup_mnt(const struct path *);
85 extern int finish_automount(struct vfsmount *, struct path *);
86
87 extern int sb_prepare_remount_readonly(struct super_block *);
88
89 extern void __init mnt_init(void);
90
91 extern int __mnt_want_write_file(struct file *);
92 extern void __mnt_drop_write_file(struct file *);
93
94 extern void dissolve_on_fput(struct vfsmount *);
95
96 int path_mount(const char *dev_name, struct path *path,
97 const char *type_page, unsigned long flags, void *data_page);
98 int path_umount(struct path *path, int flags);
99
100 /*
101 * fs_struct.c
102 */
103 extern void chroot_fs_refs(const struct path *, const struct path *);
104
105 /*
106 * file_table.c
107 */
108 extern struct file *alloc_empty_file(int, const struct cred *);
109 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
110
111 /*
112 * super.c
113 */
114 extern int reconfigure_super(struct fs_context *);
115 extern bool trylock_super(struct super_block *sb);
116 struct super_block *user_get_super(dev_t, bool excl);
117 void put_super(struct super_block *sb);
118 extern bool mount_capable(struct fs_context *);
119
120 /*
121 * open.c
122 */
123 struct open_flags {
124 int open_flag;
125 umode_t mode;
126 int acc_mode;
127 int intent;
128 int lookup_flags;
129 };
130 extern struct file *do_filp_open(int dfd, struct filename *pathname,
131 const struct open_flags *op);
132 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
133 const char *, const struct open_flags *);
134 extern struct open_how build_open_how(int flags, umode_t mode);
135 extern int build_open_flags(const struct open_how *how, struct open_flags *op);
136 extern int __close_fd_get_file(unsigned int fd, struct file **res);
137
138 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
139 int chmod_common(const struct path *path, umode_t mode);
140 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
141 int flag);
142 int chown_common(const struct path *path, uid_t user, gid_t group);
143 extern int vfs_open(const struct path *, struct file *);
144
145 /*
146 * inode.c
147 */
148 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
149 extern void inode_add_lru(struct inode *inode);
150 extern int dentry_needs_remove_privs(struct dentry *dentry);
151
152 /*
153 * fs-writeback.c
154 */
155 extern long get_nr_dirty_inodes(void);
156 extern int invalidate_inodes(struct super_block *, bool);
157
158 /*
159 * dcache.c
160 */
161 extern int d_set_mounted(struct dentry *dentry);
162 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
163 extern struct dentry *d_alloc_cursor(struct dentry *);
164 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
165 extern char *simple_dname(struct dentry *, char *, int);
166 extern void dput_to_list(struct dentry *, struct list_head *);
167 extern void shrink_dentry_list(struct list_head *);
168
169 /*
170 * read_write.c
171 */
172 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
173
174 /*
175 * pipe.c
176 */
177 extern const struct file_operations pipefifo_fops;
178
179 /*
180 * fs_pin.c
181 */
182 extern void group_pin_kill(struct hlist_head *p);
183 extern void mnt_pin_kill(struct mount *m);
184
185 /*
186 * fs/nsfs.c
187 */
188 extern const struct dentry_operations ns_dentry_operations;
189
190 /* direct-io.c: */
191 int sb_init_dio_done_wq(struct super_block *sb);
192
193 /*
194 * fs/stat.c:
195 */
196 int do_statx(int dfd, const char __user *filename, unsigned flags,
197 unsigned int mask, struct statx __user *buffer);
198
199 /*
200 * fs/splice.c:
201 */
202 long splice_file_to_pipe(struct file *in,
203 struct pipe_inode_info *opipe,
204 loff_t *offset,
205 size_t len, unsigned int flags);