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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
8struct super_block;
9struct file_system_type;
10struct iomap;
11struct iomap_ops;
12struct linux_binprm;
13struct path;
14struct mount;
15struct shrink_control;
16struct fs_context;
17struct user_namespace;
18struct pipe_inode_info;
19struct iov_iter;
20
21/*
22 * block/bdev.c
23 */
24#ifdef CONFIG_BLOCK
25extern void __init bdev_cache_init(void);
26
27void emergency_thaw_bdev(struct super_block *sb);
28#else
29static inline void bdev_cache_init(void)
30{
31}
32static inline int emergency_thaw_bdev(struct super_block *sb)
33{
34 return 0;
35}
36#endif /* CONFIG_BLOCK */
37
38/*
39 * buffer.c
40 */
41int __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 */
47extern void __init chrdev_init(void);
48
49/*
50 * fs_context.c
51 */
52extern const struct fs_context_operations legacy_fs_context_ops;
53extern int parse_monolithic_mount_data(struct fs_context *, void *);
54extern void vfs_clean_context(struct fs_context *fc);
55extern int finish_clean_context(struct fs_context *fc);
56
57/*
58 * namei.c
59 */
60extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
61 struct path *path, struct path *root);
62extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
63 const char *, unsigned int, struct path *);
64int do_rmdir(int dfd, struct filename *name);
65int do_unlinkat(int dfd, struct filename *name);
66int may_linkat(struct user_namespace *mnt_userns, const struct path *link);
67int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
68 struct filename *newname, unsigned int flags);
69int do_mkdirat(int dfd, struct filename *name, umode_t mode);
70int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
71int do_linkat(int olddfd, struct filename *old, int newdfd,
72 struct filename *new, int flags);
73
74/*
75 * namespace.c
76 */
77extern struct vfsmount *lookup_mnt(const struct path *);
78extern int finish_automount(struct vfsmount *, const struct path *);
79
80extern int sb_prepare_remount_readonly(struct super_block *);
81
82extern void __init mnt_init(void);
83
84extern int __mnt_want_write_file(struct file *);
85extern void __mnt_drop_write_file(struct file *);
86
87extern void dissolve_on_fput(struct vfsmount *);
88extern bool may_mount(void);
89
90int path_mount(const char *dev_name, struct path *path,
91 const char *type_page, unsigned long flags, void *data_page);
92int path_umount(struct path *path, int flags);
93
94/*
95 * fs_struct.c
96 */
97extern void chroot_fs_refs(const struct path *, const struct path *);
98
99/*
100 * file_table.c
101 */
102extern struct file *alloc_empty_file(int, const struct cred *);
103extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
104
105static 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 */
118extern int reconfigure_super(struct fs_context *);
119extern bool trylock_super(struct super_block *sb);
120struct super_block *user_get_super(dev_t, bool excl);
121void put_super(struct super_block *sb);
122extern bool mount_capable(struct fs_context *);
123
124/*
125 * open.c
126 */
127struct open_flags {
128 int open_flag;
129 umode_t mode;
130 int acc_mode;
131 int intent;
132 int lookup_flags;
133};
134extern struct file *do_filp_open(int dfd, struct filename *pathname,
135 const struct open_flags *op);
136extern struct file *do_file_open_root(const struct path *,
137 const char *, const struct open_flags *);
138extern struct open_how build_open_how(int flags, umode_t mode);
139extern int build_open_flags(const struct open_how *how, struct open_flags *op);
140extern struct file *__close_fd_get_file(unsigned int fd);
141
142long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
143int chmod_common(const struct path *path, umode_t mode);
144int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
145 int flag);
146int chown_common(const struct path *path, uid_t user, gid_t group);
147extern int vfs_open(const struct path *, struct file *);
148
149/*
150 * inode.c
151 */
152extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
153extern int dentry_needs_remove_privs(struct dentry *dentry);
154
155/*
156 * fs-writeback.c
157 */
158extern long get_nr_dirty_inodes(void);
159extern int invalidate_inodes(struct super_block *, bool);
160
161/*
162 * dcache.c
163 */
164extern int d_set_mounted(struct dentry *dentry);
165extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
166extern struct dentry *d_alloc_cursor(struct dentry *);
167extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
168extern char *simple_dname(struct dentry *, char *, int);
169extern void dput_to_list(struct dentry *, struct list_head *);
170extern void shrink_dentry_list(struct list_head *);
171
172/*
173 * pipe.c
174 */
175extern const struct file_operations pipefifo_fops;
176
177/*
178 * fs_pin.c
179 */
180extern void group_pin_kill(struct hlist_head *p);
181extern void mnt_pin_kill(struct mount *m);
182
183/*
184 * fs/nsfs.c
185 */
186extern const struct dentry_operations ns_dentry_operations;
187
188/* direct-io.c: */
189int sb_init_dio_done_wq(struct super_block *sb);
190
191/*
192 * fs/stat.c:
193 */
194
195int getname_statx_lookup_flags(int flags);
196int 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 */
202long 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 */
210struct xattr_name {
211 char name[XATTR_NAME_MAX + 1];
212};
213
214struct 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
228ssize_t do_getxattr(struct user_namespace *mnt_userns,
229 struct dentry *d,
230 struct xattr_ctx *ctx);
231
232int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
233int do_setxattr(struct user_namespace *mnt_userns, struct dentry *dentry,
234 struct xattr_ctx *ctx);
235
236ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos);