Line data Source code
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 pipe_inode_info;
18 : struct iov_iter;
19 : struct mnt_idmap;
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
29 : static inline void bdev_cache_init(void)
30 : {
31 : }
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 : int do_rmdir(int dfd, struct filename *name);
63 : int do_unlinkat(int dfd, struct filename *name);
64 : int may_linkat(struct mnt_idmap *idmap, const struct path *link);
65 : int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
66 : struct filename *newname, unsigned int flags);
67 : int do_mkdirat(int dfd, struct filename *name, umode_t mode);
68 : int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
69 : int do_linkat(int olddfd, struct filename *old, int newdfd,
70 : struct filename *new, int flags);
71 :
72 : /*
73 : * namespace.c
74 : */
75 : extern struct vfsmount *lookup_mnt(const struct path *);
76 : extern int finish_automount(struct vfsmount *, const struct path *);
77 :
78 : extern int sb_prepare_remount_readonly(struct super_block *);
79 :
80 : extern void __init mnt_init(void);
81 :
82 : extern int __mnt_want_write_file(struct file *);
83 : extern void __mnt_drop_write_file(struct file *);
84 :
85 : extern void dissolve_on_fput(struct vfsmount *);
86 : extern bool may_mount(void);
87 :
88 : int path_mount(const char *dev_name, struct path *path,
89 : const char *type_page, unsigned long flags, void *data_page);
90 : int path_umount(struct path *path, int flags);
91 :
92 : /*
93 : * fs_struct.c
94 : */
95 : extern void chroot_fs_refs(const struct path *, const struct path *);
96 :
97 : /*
98 : * file_table.c
99 : */
100 : extern struct file *alloc_empty_file(int, const struct cred *);
101 : extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
102 :
103 0 : static inline void put_file_access(struct file *file)
104 : {
105 0 : if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
106 0 : i_readcount_dec(file->f_inode);
107 0 : } else if (file->f_mode & FMODE_WRITER) {
108 0 : put_write_access(file->f_inode);
109 0 : __mnt_drop_write(file->f_path.mnt);
110 : }
111 0 : }
112 :
113 : /*
114 : * super.c
115 : */
116 : extern int reconfigure_super(struct fs_context *);
117 : extern bool trylock_super(struct super_block *sb);
118 : struct super_block *user_get_super(dev_t, bool excl);
119 : void put_super(struct super_block *sb);
120 : extern bool mount_capable(struct fs_context *);
121 : int sb_init_dio_done_wq(struct super_block *sb);
122 :
123 : /*
124 : * open.c
125 : */
126 : struct open_flags {
127 : int open_flag;
128 : umode_t mode;
129 : int acc_mode;
130 : int intent;
131 : int lookup_flags;
132 : };
133 : extern struct file *do_filp_open(int dfd, struct filename *pathname,
134 : const struct open_flags *op);
135 : extern struct file *do_file_open_root(const struct path *,
136 : const char *, const struct open_flags *);
137 : extern struct open_how build_open_how(int flags, umode_t mode);
138 : extern int build_open_flags(const struct open_how *how, struct open_flags *op);
139 : extern struct file *__close_fd_get_file(unsigned int fd);
140 :
141 : long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
142 : int chmod_common(const struct path *path, umode_t mode);
143 : int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
144 : int flag);
145 : int chown_common(const struct path *path, uid_t user, gid_t group);
146 : extern int vfs_open(const struct path *, struct file *);
147 :
148 : /*
149 : * inode.c
150 : */
151 : extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
152 : int dentry_needs_remove_privs(struct mnt_idmap *, struct dentry *dentry);
153 : bool in_group_or_capable(struct mnt_idmap *idmap,
154 : const struct inode *inode, vfsgid_t vfsgid);
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 : * pipe.c
175 : */
176 : extern const struct file_operations pipefifo_fops;
177 :
178 : /*
179 : * fs_pin.c
180 : */
181 : extern void group_pin_kill(struct hlist_head *p);
182 : extern void mnt_pin_kill(struct mount *m);
183 :
184 : /*
185 : * fs/nsfs.c
186 : */
187 : extern const struct dentry_operations ns_dentry_operations;
188 :
189 : /*
190 : * fs/stat.c:
191 : */
192 :
193 : int getname_statx_lookup_flags(int flags);
194 : int do_statx(int dfd, struct filename *filename, unsigned int flags,
195 : unsigned int mask, struct statx __user *buffer);
196 :
197 : /*
198 : * fs/splice.c:
199 : */
200 : long splice_file_to_pipe(struct file *in,
201 : struct pipe_inode_info *opipe,
202 : loff_t *offset,
203 : size_t len, unsigned int flags);
204 :
205 : /*
206 : * fs/xattr.c:
207 : */
208 : struct xattr_name {
209 : char name[XATTR_NAME_MAX + 1];
210 : };
211 :
212 : struct xattr_ctx {
213 : /* Value of attribute */
214 : union {
215 : const void __user *cvalue;
216 : void __user *value;
217 : };
218 : void *kvalue;
219 : size_t size;
220 : /* Attribute name */
221 : struct xattr_name *kname;
222 : unsigned int flags;
223 : };
224 :
225 :
226 : ssize_t do_getxattr(struct mnt_idmap *idmap,
227 : struct dentry *d,
228 : struct xattr_ctx *ctx);
229 :
230 : int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
231 : int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
232 : struct xattr_ctx *ctx);
233 : int may_write_xattr(struct mnt_idmap *idmap, struct inode *inode);
234 :
235 : #ifdef CONFIG_FS_POSIX_ACL
236 : int do_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
237 : const char *acl_name, const void *kvalue, size_t size);
238 : ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
239 : const char *acl_name, void *kvalue, size_t size);
240 : #else
241 : static inline int do_set_acl(struct mnt_idmap *idmap,
242 : struct dentry *dentry, const char *acl_name,
243 : const void *kvalue, size_t size)
244 : {
245 : return -EOPNOTSUPP;
246 : }
247 : static inline ssize_t do_get_acl(struct mnt_idmap *idmap,
248 : struct dentry *dentry, const char *acl_name,
249 : void *kvalue, size_t size)
250 : {
251 : return -EOPNOTSUPP;
252 : }
253 : #endif
254 :
255 : ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos);
256 :
257 : /*
258 : * fs/attr.c
259 : */
260 : struct mnt_idmap *alloc_mnt_idmap(struct user_namespace *mnt_userns);
261 : struct mnt_idmap *mnt_idmap_get(struct mnt_idmap *idmap);
262 : void mnt_idmap_put(struct mnt_idmap *idmap);
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