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1/* fs/ internal definitions
2 *
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12struct super_block;
13struct file_system_type;
14struct linux_binprm;
15struct path;
16struct mount;
17struct shrink_control;
18
19/*
20 * block_dev.c
21 */
22#ifdef CONFIG_BLOCK
23extern void __init bdev_cache_init(void);
24
25extern int __sync_blockdev(struct block_device *bdev, int wait);
26
27#else
28static inline void bdev_cache_init(void)
29{
30}
31
32static inline int __sync_blockdev(struct block_device *bdev, int wait)
33{
34 return 0;
35}
36#endif
37
38/*
39 * buffer.c
40 */
41extern void guard_bio_eod(int rw, struct bio *bio);
42
43/*
44 * char_dev.c
45 */
46extern void __init chrdev_init(void);
47
48/*
49 * namei.c
50 */
51extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
52extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
53 const char *, unsigned int, struct path *);
54
55/*
56 * namespace.c
57 */
58extern void *copy_mount_options(const void __user *);
59extern char *copy_mount_string(const void __user *);
60
61extern struct vfsmount *lookup_mnt(struct path *);
62extern int finish_automount(struct vfsmount *, struct path *);
63
64extern int sb_prepare_remount_readonly(struct super_block *);
65
66extern void __init mnt_init(void);
67
68extern int __mnt_want_write(struct vfsmount *);
69extern int __mnt_want_write_file(struct file *);
70extern void __mnt_drop_write(struct vfsmount *);
71extern void __mnt_drop_write_file(struct file *);
72
73/*
74 * fs_struct.c
75 */
76extern void chroot_fs_refs(const struct path *, const struct path *);
77
78/*
79 * file_table.c
80 */
81extern struct file *get_empty_filp(void);
82
83/*
84 * super.c
85 */
86extern int do_remount_sb(struct super_block *, int, void *, int);
87extern bool trylock_super(struct super_block *sb);
88extern struct dentry *mount_fs(struct file_system_type *,
89 int, const char *, void *);
90extern struct super_block *user_get_super(dev_t);
91
92/*
93 * open.c
94 */
95struct open_flags {
96 int open_flag;
97 umode_t mode;
98 int acc_mode;
99 int intent;
100 int lookup_flags;
101};
102extern struct file *do_filp_open(int dfd, struct filename *pathname,
103 const struct open_flags *op);
104extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
105 const char *, const struct open_flags *);
106
107extern long do_handle_open(int mountdirfd,
108 struct file_handle __user *ufh, int open_flag);
109extern int open_check_o_direct(struct file *f);
110extern int vfs_open(const struct path *, struct file *, const struct cred *);
111
112/*
113 * inode.c
114 */
115extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
116extern void inode_add_lru(struct inode *inode);
117
118/*
119 * fs-writeback.c
120 */
121extern void inode_io_list_del(struct inode *inode);
122
123extern long get_nr_dirty_inodes(void);
124extern void evict_inodes(struct super_block *);
125extern int invalidate_inodes(struct super_block *, bool);
126
127/*
128 * dcache.c
129 */
130extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
131extern int d_set_mounted(struct dentry *dentry);
132extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
133
134/*
135 * read_write.c
136 */
137extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
138
139/*
140 * pipe.c
141 */
142extern const struct file_operations pipefifo_fops;
143
144/*
145 * fs_pin.c
146 */
147extern void group_pin_kill(struct hlist_head *p);
148extern void mnt_pin_kill(struct mount *m);
149
150/*
151 * fs/nsfs.c
152 */
153extern struct dentry_operations ns_dentry_operations;
154
155/*
156 * fs/ioctl.c
157 */
158extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
159 unsigned long arg);
160extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
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);
153int dentry_needs_remove_privs(struct user_namespace *, struct dentry *dentry);
154bool in_group_or_capable(struct user_namespace *mnt_userns,
155 const struct inode *inode, vfsgid_t vfsgid);
156
157/*
158 * fs-writeback.c
159 */
160extern long get_nr_dirty_inodes(void);
161extern int invalidate_inodes(struct super_block *, bool);
162
163/*
164 * dcache.c
165 */
166extern int d_set_mounted(struct dentry *dentry);
167extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
168extern struct dentry *d_alloc_cursor(struct dentry *);
169extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
170extern char *simple_dname(struct dentry *, char *, int);
171extern void dput_to_list(struct dentry *, struct list_head *);
172extern void shrink_dentry_list(struct list_head *);
173
174/*
175 * pipe.c
176 */
177extern const struct file_operations pipefifo_fops;
178
179/*
180 * fs_pin.c
181 */
182extern void group_pin_kill(struct hlist_head *p);
183extern void mnt_pin_kill(struct mount *m);
184
185/*
186 * fs/nsfs.c
187 */
188extern const struct dentry_operations ns_dentry_operations;
189
190/* direct-io.c: */
191int sb_init_dio_done_wq(struct super_block *sb);
192
193/*
194 * fs/stat.c:
195 */
196
197int getname_statx_lookup_flags(int flags);
198int do_statx(int dfd, struct filename *filename, unsigned int flags,
199 unsigned int mask, struct statx __user *buffer);
200
201/*
202 * fs/splice.c:
203 */
204long splice_file_to_pipe(struct file *in,
205 struct pipe_inode_info *opipe,
206 loff_t *offset,
207 size_t len, unsigned int flags);
208
209/*
210 * fs/xattr.c:
211 */
212struct xattr_name {
213 char name[XATTR_NAME_MAX + 1];
214};
215
216struct xattr_ctx {
217 /* Value of attribute */
218 union {
219 const void __user *cvalue;
220 void __user *value;
221 };
222 void *kvalue;
223 size_t size;
224 /* Attribute name */
225 struct xattr_name *kname;
226 unsigned int flags;
227};
228
229
230ssize_t do_getxattr(struct mnt_idmap *idmap,
231 struct dentry *d,
232 struct xattr_ctx *ctx);
233
234int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
235int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
236 struct xattr_ctx *ctx);
237int may_write_xattr(struct user_namespace *mnt_userns, struct inode *inode);
238
239#ifdef CONFIG_FS_POSIX_ACL
240int do_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
241 const char *acl_name, const void *kvalue, size_t size);
242ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
243 const char *acl_name, void *kvalue, size_t size);
244#else
245static inline int do_set_acl(struct mnt_idmap *idmap,
246 struct dentry *dentry, const char *acl_name,
247 const void *kvalue, size_t size)
248{
249 return -EOPNOTSUPP;
250}
251static inline ssize_t do_get_acl(struct mnt_idmap *idmap,
252 struct dentry *dentry, const char *acl_name,
253 void *kvalue, size_t size)
254{
255 return -EOPNOTSUPP;
256}
257#endif
258
259ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos);
260
261/*
262 * fs/attr.c
263 */
264int setattr_should_drop_sgid(struct user_namespace *mnt_userns,
265 const struct inode *inode);