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 struct iov_iter;
20
21 /*
22 * block/bdev.c
23 */
24 #ifdef CONFIG_BLOCK
25 extern void __init bdev_cache_init(void);
26
27 void emergency_thaw_bdev(struct super_block *sb);
28 #else
bdev_cache_init(void)29 static inline void bdev_cache_init(void)
30 {
31 }
emergency_thaw_bdev(struct super_block * sb)32 static inline int emergency_thaw_bdev(struct super_block *sb)
33 {
34 return 0;
35 }
36 #endif /* CONFIG_BLOCK */
37
38 /*
39 * buffer.c
40 */
41 int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
42 get_block_t *get_block, const struct iomap *iomap);
43
44 /*
45 * char_dev.c
46 */
47 extern void __init chrdev_init(void);
48
49 /*
50 * fs_context.c
51 */
52 extern const struct fs_context_operations legacy_fs_context_ops;
53 extern int parse_monolithic_mount_data(struct fs_context *, void *);
54 extern void vfs_clean_context(struct fs_context *fc);
55 extern int finish_clean_context(struct fs_context *fc);
56
57 /*
58 * namei.c
59 */
60 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
61 struct path *path, struct path *root);
62 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
63 const char *, unsigned int, struct path *);
64 int do_rmdir(int dfd, struct filename *name);
65 int do_unlinkat(int dfd, struct filename *name);
66 int may_linkat(struct user_namespace *mnt_userns, const struct path *link);
67 int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
68 struct filename *newname, unsigned int flags);
69 int do_mkdirat(int dfd, struct filename *name, umode_t mode);
70 int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
71 int do_linkat(int olddfd, struct filename *old, int newdfd,
72 struct filename *new, int flags);
73
74 /*
75 * namespace.c
76 */
77 extern struct vfsmount *lookup_mnt(const struct path *);
78 extern int finish_automount(struct vfsmount *, const struct path *);
79
80 extern int sb_prepare_remount_readonly(struct super_block *);
81
82 extern void __init mnt_init(void);
83
84 extern int __mnt_want_write_file(struct file *);
85 extern void __mnt_drop_write_file(struct file *);
86
87 extern void dissolve_on_fput(struct vfsmount *);
88 extern bool may_mount(void);
89
90 int path_mount(const char *dev_name, struct path *path,
91 const char *type_page, unsigned long flags, void *data_page);
92 int path_umount(struct path *path, int flags);
93
94 /*
95 * fs_struct.c
96 */
97 extern void chroot_fs_refs(const struct path *, const struct path *);
98
99 /*
100 * file_table.c
101 */
102 extern struct file *alloc_empty_file(int, const struct cred *);
103 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
104
put_file_access(struct file * file)105 static inline void put_file_access(struct file *file)
106 {
107 if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
108 i_readcount_dec(file->f_inode);
109 } else if (file->f_mode & FMODE_WRITER) {
110 put_write_access(file->f_inode);
111 __mnt_drop_write(file->f_path.mnt);
112 }
113 }
114
115 /*
116 * super.c
117 */
118 extern int reconfigure_super(struct fs_context *);
119 extern bool trylock_super(struct super_block *sb);
120 struct super_block *user_get_super(dev_t, bool excl);
121 void put_super(struct super_block *sb);
122 extern bool mount_capable(struct fs_context *);
123
124 /*
125 * open.c
126 */
127 struct open_flags {
128 int open_flag;
129 umode_t mode;
130 int acc_mode;
131 int intent;
132 int lookup_flags;
133 };
134 extern struct file *do_filp_open(int dfd, struct filename *pathname,
135 const struct open_flags *op);
136 extern struct file *do_file_open_root(const struct path *,
137 const char *, const struct open_flags *);
138 extern struct open_how build_open_how(int flags, umode_t mode);
139 extern int build_open_flags(const struct open_how *how, struct open_flags *op);
140 extern struct file *__close_fd_get_file(unsigned int fd);
141
142 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
143 int chmod_common(const struct path *path, umode_t mode);
144 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
145 int flag);
146 int chown_common(const struct path *path, uid_t user, gid_t group);
147 extern int vfs_open(const struct path *, struct file *);
148
149 /*
150 * inode.c
151 */
152 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
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 * pipe.c
174 */
175 extern const struct file_operations pipefifo_fops;
176
177 /*
178 * fs_pin.c
179 */
180 extern void group_pin_kill(struct hlist_head *p);
181 extern void mnt_pin_kill(struct mount *m);
182
183 /*
184 * fs/nsfs.c
185 */
186 extern const struct dentry_operations ns_dentry_operations;
187
188 /* direct-io.c: */
189 int sb_init_dio_done_wq(struct super_block *sb);
190
191 /*
192 * fs/stat.c:
193 */
194
195 int getname_statx_lookup_flags(int flags);
196 int do_statx(int dfd, struct filename *filename, unsigned int 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);
206
207 /*
208 * fs/xattr.c:
209 */
210 struct xattr_name {
211 char name[XATTR_NAME_MAX + 1];
212 };
213
214 struct xattr_ctx {
215 /* Value of attribute */
216 union {
217 const void __user *cvalue;
218 void __user *value;
219 };
220 void *kvalue;
221 size_t size;
222 /* Attribute name */
223 struct xattr_name *kname;
224 unsigned int flags;
225 };
226
227
228 ssize_t do_getxattr(struct user_namespace *mnt_userns,
229 struct dentry *d,
230 struct xattr_ctx *ctx);
231
232 int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
233 int do_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
234 struct xattr_ctx *ctx);
235
236 ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos);
237
