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 | #else |
27 | static inline void bdev_cache_init(void) |
28 | { |
29 | } |
30 | #endif /* CONFIG_BLOCK */ |
31 | |
32 | /* |
33 | * buffer.c |
34 | */ |
35 | int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len, |
36 | get_block_t *get_block, const struct iomap *iomap); |
37 | |
38 | /* |
39 | * char_dev.c |
40 | */ |
41 | extern void __init chrdev_init(void); |
42 | |
43 | /* |
44 | * fs_context.c |
45 | */ |
46 | extern const struct fs_context_operations legacy_fs_context_ops; |
47 | extern int parse_monolithic_mount_data(struct fs_context *, void *); |
48 | extern void vfs_clean_context(struct fs_context *fc); |
49 | extern int finish_clean_context(struct fs_context *fc); |
50 | |
51 | /* |
52 | * namei.c |
53 | */ |
54 | extern int filename_lookup(int dfd, struct filename *name, unsigned flags, |
55 | struct path *path, struct path *root); |
56 | int do_rmdir(int dfd, struct filename *name); |
57 | int do_unlinkat(int dfd, struct filename *name); |
58 | int may_linkat(struct mnt_idmap *idmap, const struct path *link); |
59 | int do_renameat2(int olddfd, struct filename *oldname, int newdfd, |
60 | struct filename *newname, unsigned int flags); |
61 | int do_mkdirat(int dfd, struct filename *name, umode_t mode); |
62 | int do_symlinkat(struct filename *from, int newdfd, struct filename *to); |
63 | int do_linkat(int olddfd, struct filename *old, int newdfd, |
64 | struct filename *new, int flags); |
65 | |
66 | /* |
67 | * namespace.c |
68 | */ |
69 | extern struct vfsmount *lookup_mnt(const struct path *); |
70 | extern int finish_automount(struct vfsmount *, const struct path *); |
71 | |
72 | extern int sb_prepare_remount_readonly(struct super_block *); |
73 | |
74 | extern void __init mnt_init(void); |
75 | |
76 | int mnt_get_write_access_file(struct file *file); |
77 | void mnt_put_write_access_file(struct file *file); |
78 | |
79 | extern void dissolve_on_fput(struct vfsmount *); |
80 | extern bool may_mount(void); |
81 | |
82 | int path_mount(const char *dev_name, struct path *path, |
83 | const char *type_page, unsigned long flags, void *data_page); |
84 | int path_umount(struct path *path, int flags); |
85 | |
86 | /* |
87 | * fs_struct.c |
88 | */ |
89 | extern void chroot_fs_refs(const struct path *, const struct path *); |
90 | |
91 | /* |
92 | * file_table.c |
93 | */ |
94 | struct file *alloc_empty_file(int flags, const struct cred *cred); |
95 | struct file *alloc_empty_file_noaccount(int flags, const struct cred *cred); |
96 | struct file *alloc_empty_backing_file(int flags, const struct cred *cred); |
97 | void release_empty_file(struct file *f); |
98 | |
99 | static inline void file_put_write_access(struct file *file) |
100 | { |
101 | put_write_access(inode: file->f_inode); |
102 | mnt_put_write_access(mnt: file->f_path.mnt); |
103 | if (unlikely(file->f_mode & FMODE_BACKING)) |
104 | mnt_put_write_access(mnt: backing_file_user_path(f: file)->mnt); |
105 | } |
106 | |
107 | static inline void put_file_access(struct file *file) |
108 | { |
109 | if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) { |
110 | i_readcount_dec(inode: file->f_inode); |
111 | } else if (file->f_mode & FMODE_WRITER) { |
112 | file_put_write_access(file); |
113 | } |
114 | } |
115 | |
116 | /* |
117 | * super.c |
118 | */ |
119 | extern int reconfigure_super(struct fs_context *); |
120 | extern bool super_trylock_shared(struct super_block *sb); |
121 | struct super_block *user_get_super(dev_t, bool excl); |
122 | void put_super(struct super_block *sb); |
123 | extern bool mount_capable(struct fs_context *); |
124 | int sb_init_dio_done_wq(struct super_block *sb); |
125 | |
126 | /* |
127 | * Prepare superblock for changing its read-only state (i.e., either remount |
128 | * read-write superblock read-only or vice versa). After this function returns |
129 | * mnt_is_readonly() will return true for any mount of the superblock if its |
130 | * caller is able to observe any changes done by the remount. This holds until |
131 | * sb_end_ro_state_change() is called. |
132 | */ |
133 | static inline void sb_start_ro_state_change(struct super_block *sb) |
134 | { |
135 | WRITE_ONCE(sb->s_readonly_remount, 1); |
136 | /* |
137 | * For RO->RW transition, the barrier pairs with the barrier in |
138 | * mnt_is_readonly() making sure if mnt_is_readonly() sees SB_RDONLY |
139 | * cleared, it will see s_readonly_remount set. |
140 | * For RW->RO transition, the barrier pairs with the barrier in |
141 | * mnt_get_write_access() before the mnt_is_readonly() check. |
142 | * The barrier makes sure if mnt_get_write_access() sees MNT_WRITE_HOLD |
143 | * already cleared, it will see s_readonly_remount set. |
144 | */ |
145 | smp_wmb(); |
146 | } |
147 | |
148 | /* |
149 | * Ends section changing read-only state of the superblock. After this function |
150 | * returns if mnt_is_readonly() returns false, the caller will be able to |
151 | * observe all the changes remount did to the superblock. |
152 | */ |
153 | static inline void sb_end_ro_state_change(struct super_block *sb) |
154 | { |
155 | /* |
156 | * This barrier provides release semantics that pairs with |
157 | * the smp_rmb() acquire semantics in mnt_is_readonly(). |
158 | * This barrier pair ensure that when mnt_is_readonly() sees |
159 | * 0 for sb->s_readonly_remount, it will also see all the |
160 | * preceding flag changes that were made during the RO state |
161 | * change. |
162 | */ |
163 | smp_wmb(); |
164 | WRITE_ONCE(sb->s_readonly_remount, 0); |
165 | } |
166 | |
167 | /* |
168 | * open.c |
169 | */ |
170 | struct open_flags { |
171 | int open_flag; |
172 | umode_t mode; |
173 | int acc_mode; |
174 | int intent; |
175 | int lookup_flags; |
176 | }; |
177 | extern struct file *do_filp_open(int dfd, struct filename *pathname, |
178 | const struct open_flags *op); |
179 | extern struct file *do_file_open_root(const struct path *, |
180 | const char *, const struct open_flags *); |
181 | extern struct open_how build_open_how(int flags, umode_t mode); |
182 | extern int build_open_flags(const struct open_how *how, struct open_flags *op); |
183 | extern struct file *__close_fd_get_file(unsigned int fd); |
184 | |
185 | long do_sys_ftruncate(unsigned int fd, loff_t length, int small); |
186 | int chmod_common(const struct path *path, umode_t mode); |
187 | int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group, |
188 | int flag); |
189 | int chown_common(const struct path *path, uid_t user, gid_t group); |
190 | extern int vfs_open(const struct path *, struct file *); |
191 | |
192 | /* |
193 | * inode.c |
194 | */ |
195 | extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc); |
196 | int dentry_needs_remove_privs(struct mnt_idmap *, struct dentry *dentry); |
197 | bool in_group_or_capable(struct mnt_idmap *idmap, |
198 | const struct inode *inode, vfsgid_t vfsgid); |
199 | void lock_two_inodes(struct inode *inode1, struct inode *inode2, |
200 | unsigned subclass1, unsigned subclass2); |
201 | |
202 | /* |
203 | * fs-writeback.c |
204 | */ |
205 | extern long get_nr_dirty_inodes(void); |
206 | void invalidate_inodes(struct super_block *sb); |
207 | |
208 | /* |
209 | * dcache.c |
210 | */ |
211 | extern int d_set_mounted(struct dentry *dentry); |
212 | extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc); |
213 | extern struct dentry *d_alloc_cursor(struct dentry *); |
214 | extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *); |
215 | extern char *simple_dname(struct dentry *, char *, int); |
216 | extern void dput_to_list(struct dentry *, struct list_head *); |
217 | extern void shrink_dentry_list(struct list_head *); |
218 | |
219 | /* |
220 | * pipe.c |
221 | */ |
222 | extern const struct file_operations pipefifo_fops; |
223 | |
224 | /* |
225 | * fs_pin.c |
226 | */ |
227 | extern void group_pin_kill(struct hlist_head *p); |
228 | extern void mnt_pin_kill(struct mount *m); |
229 | |
230 | /* |
231 | * fs/nsfs.c |
232 | */ |
233 | extern const struct dentry_operations ns_dentry_operations; |
234 | |
235 | /* |
236 | * fs/stat.c: |
237 | */ |
238 | |
239 | int getname_statx_lookup_flags(int flags); |
240 | int do_statx(int dfd, struct filename *filename, unsigned int flags, |
241 | unsigned int mask, struct statx __user *buffer); |
242 | |
243 | /* |
244 | * fs/splice.c: |
245 | */ |
246 | long splice_file_to_pipe(struct file *in, |
247 | struct pipe_inode_info *opipe, |
248 | loff_t *offset, |
249 | size_t len, unsigned int flags); |
250 | |
251 | /* |
252 | * fs/xattr.c: |
253 | */ |
254 | struct xattr_name { |
255 | char name[XATTR_NAME_MAX + 1]; |
256 | }; |
257 | |
258 | struct xattr_ctx { |
259 | /* Value of attribute */ |
260 | union { |
261 | const void __user *cvalue; |
262 | void __user *value; |
263 | }; |
264 | void *kvalue; |
265 | size_t size; |
266 | /* Attribute name */ |
267 | struct xattr_name *kname; |
268 | unsigned int flags; |
269 | }; |
270 | |
271 | |
272 | ssize_t do_getxattr(struct mnt_idmap *idmap, |
273 | struct dentry *d, |
274 | struct xattr_ctx *ctx); |
275 | |
276 | int setxattr_copy(const char __user *name, struct xattr_ctx *ctx); |
277 | int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry, |
278 | struct xattr_ctx *ctx); |
279 | int may_write_xattr(struct mnt_idmap *idmap, struct inode *inode); |
280 | |
281 | #ifdef CONFIG_FS_POSIX_ACL |
282 | int do_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, |
283 | const char *acl_name, const void *kvalue, size_t size); |
284 | ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry, |
285 | const char *acl_name, void *kvalue, size_t size); |
286 | #else |
287 | static inline int do_set_acl(struct mnt_idmap *idmap, |
288 | struct dentry *dentry, const char *acl_name, |
289 | const void *kvalue, size_t size) |
290 | { |
291 | return -EOPNOTSUPP; |
292 | } |
293 | static inline ssize_t do_get_acl(struct mnt_idmap *idmap, |
294 | struct dentry *dentry, const char *acl_name, |
295 | void *kvalue, size_t size) |
296 | { |
297 | return -EOPNOTSUPP; |
298 | } |
299 | #endif |
300 | |
301 | ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos); |
302 | |
303 | /* |
304 | * fs/attr.c |
305 | */ |
306 | struct mnt_idmap *alloc_mnt_idmap(struct user_namespace *mnt_userns); |
307 | struct mnt_idmap *mnt_idmap_get(struct mnt_idmap *idmap); |
308 | void mnt_idmap_put(struct mnt_idmap *idmap); |
309 | |