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
19 /*
20 * block_dev.c
21 */
22 #ifdef CONFIG_BLOCK
23 extern void __init bdev_cache_init(void);
24
25 extern int __sync_blockdev(struct block_device *bdev, int wait);
26 void iterate_bdevs(void (*)(struct block_device *, void *), void *);
27 void emergency_thaw_bdev(struct super_block *sb);
28 void bd_forget(struct inode *inode);
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 }
bd_forget(struct inode * inode)46 static inline void bd_forget(struct inode *inode)
47 {
48 }
49 #endif /* CONFIG_BLOCK */
50
51 /*
52 * buffer.c
53 */
54 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
55 get_block_t *get_block, struct iomap *iomap);
56
57 /*
58 * char_dev.c
59 */
60 extern void __init chrdev_init(void);
61
62 /*
63 * fs_context.c
64 */
65 extern const struct fs_context_operations legacy_fs_context_ops;
66 extern int parse_monolithic_mount_data(struct fs_context *, void *);
67 extern void vfs_clean_context(struct fs_context *fc);
68 extern int finish_clean_context(struct fs_context *fc);
69
70 /*
71 * namei.c
72 */
73 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
74 struct path *path, struct path *root);
75 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
76 const char *, unsigned int, struct path *);
77 long do_rmdir(int dfd, struct filename *name);
78 long do_unlinkat(int dfd, struct filename *name);
79 int may_linkat(struct path *link);
80 int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
81 struct filename *newname, unsigned int flags);
82
83 /*
84 * namespace.c
85 */
86 extern struct vfsmount *lookup_mnt(const struct path *);
87 extern int finish_automount(struct vfsmount *, struct path *);
88
89 extern int sb_prepare_remount_readonly(struct super_block *);
90
91 extern void __init mnt_init(void);
92
93 extern int __mnt_want_write_file(struct file *);
94 extern void __mnt_drop_write_file(struct file *);
95
96 extern void dissolve_on_fput(struct vfsmount *);
97
98 int path_mount(const char *dev_name, struct path *path,
99 const char *type_page, unsigned long flags, void *data_page);
100 int path_umount(struct path *path, int flags);
101
102 /*
103 * fs_struct.c
104 */
105 extern void chroot_fs_refs(const struct path *, const struct path *);
106
107 /*
108 * file_table.c
109 */
110 extern struct file *alloc_empty_file(int, const struct cred *);
111 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
112
113 /*
114 * super.c
115 */
116 extern int reconfigure_super(struct fs_context *);
117 extern bool trylock_super(struct super_block *sb);
118 extern struct super_block *user_get_super(dev_t);
119 extern bool mount_capable(struct fs_context *);
120
121 /*
122 * open.c
123 */
124 struct open_flags {
125 int open_flag;
126 umode_t mode;
127 int acc_mode;
128 int intent;
129 int lookup_flags;
130 };
131 extern struct file *do_filp_open(int dfd, struct filename *pathname,
132 const struct open_flags *op);
133 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
134 const char *, const struct open_flags *);
135 extern struct open_how build_open_how(int flags, umode_t mode);
136 extern int build_open_flags(const struct open_how *how, struct open_flags *op);
137 extern int __close_fd_get_file(unsigned int fd, struct file **res);
138
139 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
140 int chmod_common(const struct path *path, umode_t mode);
141 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
142 int flag);
143 int chown_common(const struct path *path, uid_t user, gid_t group);
144 extern int vfs_open(const struct path *, struct file *);
145
146 /*
147 * inode.c
148 */
149 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
150 extern void inode_add_lru(struct inode *inode);
151 extern int dentry_needs_remove_privs(struct dentry *dentry);
152 bool in_group_or_capable(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/attr.c
205 */
206 int setattr_should_drop_sgid(const struct inode *inode);
207