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 void emergency_thaw_bdev(struct super_block *sb);
27 #else
bdev_cache_init(void)28 static inline void bdev_cache_init(void)
29 {
30 }
emergency_thaw_bdev(struct super_block * sb)31 static inline int emergency_thaw_bdev(struct super_block *sb)
32 {
33 return 0;
34 }
35 #endif /* CONFIG_BLOCK */
36
37 /*
38 * buffer.c
39 */
40 int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
41 get_block_t *get_block, const struct iomap *iomap);
42
43 /*
44 * char_dev.c
45 */
46 extern void __init chrdev_init(void);
47
48 /*
49 * fs_context.c
50 */
51 extern const struct fs_context_operations legacy_fs_context_ops;
52 extern int parse_monolithic_mount_data(struct fs_context *, void *);
53 extern void vfs_clean_context(struct fs_context *fc);
54 extern int finish_clean_context(struct fs_context *fc);
55
56 /*
57 * namei.c
58 */
59 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
60 struct path *path, struct path *root);
61 int do_rmdir(int dfd, struct filename *name);
62 int do_unlinkat(int dfd, struct filename *name);
63 int may_linkat(struct user_namespace *mnt_userns, struct path *link);
64 int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
65 struct filename *newname, unsigned int flags);
66 int do_mkdirat(int dfd, struct filename *name, umode_t mode);
67 int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
68 int do_linkat(int olddfd, struct filename *old, int newdfd,
69 struct filename *new, int flags);
70
71 /*
72 * namespace.c
73 */
74 extern struct vfsmount *lookup_mnt(const struct path *);
75 extern int finish_automount(struct vfsmount *, struct path *);
76
77 extern int sb_prepare_remount_readonly(struct super_block *);
78
79 extern void __init mnt_init(void);
80
81 extern int __mnt_want_write_file(struct file *);
82 extern void __mnt_drop_write_file(struct file *);
83
84 extern void dissolve_on_fput(struct vfsmount *);
85
86 int path_mount(const char *dev_name, struct path *path,
87 const char *type_page, unsigned long flags, void *data_page);
88 int path_umount(struct path *path, int flags);
89
90 /*
91 * fs_struct.c
92 */
93 extern void chroot_fs_refs(const struct path *, const struct path *);
94
95 /*
96 * file_table.c
97 */
98 extern struct file *alloc_empty_file(int, const struct cred *);
99 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
100
put_file_access(struct file * file)101 static inline void put_file_access(struct file *file)
102 {
103 if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
104 i_readcount_dec(file->f_inode);
105 } else if (file->f_mode & FMODE_WRITER) {
106 put_write_access(file->f_inode);
107 __mnt_drop_write(file->f_path.mnt);
108 }
109 }
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(const struct path *,
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 int dentry_needs_remove_privs(struct user_namespace *, struct dentry *dentry);
151 bool in_group_or_capable(struct user_namespace *mnt_userns,
152 const struct inode *inode, kgid_t gid);
153 void lock_two_inodes(struct inode *inode1, struct inode *inode2,
154 unsigned subclass1, unsigned subclass2);
155
156 /*
157 * fs-writeback.c
158 */
159 extern long get_nr_dirty_inodes(void);
160 extern int invalidate_inodes(struct super_block *, bool);
161
162 /*
163 * dcache.c
164 */
165 extern int d_set_mounted(struct dentry *dentry);
166 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
167 extern struct dentry *d_alloc_cursor(struct dentry *);
168 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
169 extern char *simple_dname(struct dentry *, char *, int);
170 extern void dput_to_list(struct dentry *, struct list_head *);
171 extern void shrink_dentry_list(struct list_head *);
172
173 /*
174 * read_write.c
175 */
176 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
177
178 /*
179 * pipe.c
180 */
181 extern const struct file_operations pipefifo_fops;
182
183 /*
184 * fs_pin.c
185 */
186 extern void group_pin_kill(struct hlist_head *p);
187 extern void mnt_pin_kill(struct mount *m);
188
189 /*
190 * fs/nsfs.c
191 */
192 extern const struct dentry_operations ns_dentry_operations;
193
194 /* direct-io.c: */
195 int sb_init_dio_done_wq(struct super_block *sb);
196
197 /*
198 * fs/stat.c:
199 */
200 int do_statx(int dfd, const char __user *filename, unsigned flags,
201 unsigned int mask, struct statx __user *buffer);
202
203 /*
204 * fs/splice.c:
205 */
206 long splice_file_to_pipe(struct file *in,
207 struct pipe_inode_info *opipe,
208 loff_t *offset,
209 size_t len, unsigned int flags);
210
211 /*
212 * fs/xattr.c:
213 */
214 struct xattr_name {
215 char name[XATTR_NAME_MAX + 1];
216 };
217
218 struct xattr_ctx {
219 /* Value of attribute */
220 union {
221 const void __user *cvalue;
222 void __user *value;
223 };
224 void *kvalue;
225 size_t size;
226 /* Attribute name */
227 struct xattr_name *kname;
228 unsigned int flags;
229 };
230
231 int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
232 int do_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
233 struct xattr_ctx *ctx);
234
235 /*
236 * fs/attr.c
237 */
238