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
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 extern struct super_block *user_get_super(dev_t);
117 extern bool mount_capable(struct fs_context *);
118
119 /*
120 * open.c
121 */
122 struct open_flags {
123 int open_flag;
124 umode_t mode;
125 int acc_mode;
126 int intent;
127 int lookup_flags;
128 };
129 extern struct file *do_filp_open(int dfd, struct filename *pathname,
130 const struct open_flags *op);
131 extern struct file *do_file_open_root(const struct path *,
132 const char *, const struct open_flags *);
133 extern struct open_how build_open_how(int flags, umode_t mode);
134 extern int build_open_flags(const struct open_how *how, struct open_flags *op);
135
136 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
137 int chmod_common(const struct path *path, umode_t mode);
138 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
139 int flag);
140 int chown_common(const struct path *path, uid_t user, gid_t group);
141 extern int vfs_open(const struct path *, struct file *);
142
143 /*
144 * inode.c
145 */
146 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
147 extern void inode_add_lru(struct inode *inode);
148 extern int dentry_needs_remove_privs(struct dentry *dentry);
149
150 /*
151 * fs-writeback.c
152 */
153 extern long get_nr_dirty_inodes(void);
154 extern int invalidate_inodes(struct super_block *, bool);
155
156 /*
157 * dcache.c
158 */
159 extern int d_set_mounted(struct dentry *dentry);
160 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
161 extern struct dentry *d_alloc_cursor(struct dentry *);
162 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
163 extern char *simple_dname(struct dentry *, char *, int);
164 extern void dput_to_list(struct dentry *, struct list_head *);
165 extern void shrink_dentry_list(struct list_head *);
166
167 /*
168 * read_write.c
169 */
170 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
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 int do_statx(int dfd, const char __user *filename, unsigned flags,
195 unsigned int mask, struct statx __user *buffer);
196