1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __UM_FS_HOSTFS
3#define __UM_FS_HOSTFS
4
5#include <os.h>
6
7/*
8 * These are exactly the same definitions as in fs.h, but the names are
9 * changed so that this file can be included in both kernel and user files.
10 */
11
12#define HOSTFS_ATTR_MODE	1
13#define HOSTFS_ATTR_UID 	2
14#define HOSTFS_ATTR_GID 	4
15#define HOSTFS_ATTR_SIZE	8
16#define HOSTFS_ATTR_ATIME	16
17#define HOSTFS_ATTR_MTIME	32
18#define HOSTFS_ATTR_CTIME	64
19#define HOSTFS_ATTR_ATIME_SET	128
20#define HOSTFS_ATTR_MTIME_SET	256
21
22/* This one is unused by hostfs. */
23#define HOSTFS_ATTR_FORCE	512	/* Not a change, but a change it */
24#define HOSTFS_ATTR_ATTR_FLAG	1024
25
26/*
27 * If you are very careful, you'll notice that these two are missing:
28 *
29 * #define ATTR_KILL_SUID	2048
30 * #define ATTR_KILL_SGID	4096
31 *
32 * and this is because they were added in 2.5 development.
33 * Actually, they are not needed by most ->setattr() methods - they are set by
34 * callers of notify_change() to notify that the setuid/setgid bits must be
35 * dropped.
36 * notify_change() will delete those flags, make sure attr->ia_valid & ATTR_MODE
37 * is on, and remove the appropriate bits from attr->ia_mode (attr is a
38 * "struct iattr *"). -BlaisorBlade
39 */
40struct hostfs_timespec {
41	long long tv_sec;
42	long long tv_nsec;
43};
44
45struct hostfs_iattr {
46	unsigned int		ia_valid;
47	unsigned short		ia_mode;
48	uid_t			ia_uid;
49	gid_t			ia_gid;
50	loff_t			ia_size;
51	struct hostfs_timespec	ia_atime;
52	struct hostfs_timespec	ia_mtime;
53	struct hostfs_timespec	ia_ctime;
54};
55
56struct hostfs_stat {
57	unsigned long long ino;
58	unsigned int mode;
59	unsigned int nlink;
60	unsigned int uid;
61	unsigned int gid;
62	unsigned long long size;
63	struct hostfs_timespec atime, mtime, ctime;
64	unsigned int blksize;
65	unsigned long long blocks;
66	unsigned int maj;
67	unsigned int min;
68	dev_t dev;
69};
70
71extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
72extern int access_file(char *path, int r, int w, int x);
73extern int open_file(char *path, int r, int w, int append);
74extern void *open_dir(char *path, int *err_out);
75extern void seek_dir(void *stream, unsigned long long pos);
76extern char *read_dir(void *stream, unsigned long long *pos_out,
77		      unsigned long long *ino_out, int *len_out,
78		      unsigned int *type_out);
79extern void close_file(void *stream);
80extern int replace_file(int oldfd, int fd);
81extern void close_dir(void *stream);
82extern int read_file(int fd, unsigned long long *offset, char *buf, int len);
83extern int write_file(int fd, unsigned long long *offset, const char *buf,
84		      int len);
85extern int lseek_file(int fd, long long offset, int whence);
86extern int fsync_file(int fd, int datasync);
87extern int file_create(char *name, int mode);
88extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
89extern int make_symlink(const char *from, const char *to);
90extern int unlink_file(const char *file);
91extern int do_mkdir(const char *file, int mode);
92extern int hostfs_do_rmdir(const char *file);
93extern int do_mknod(const char *file, int mode, unsigned int major,
94		    unsigned int minor);
95extern int link_file(const char *to, const char *from);
96extern int hostfs_do_readlink(char *file, char *buf, int size);
97extern int rename_file(char *from, char *to);
98extern int rename2_file(char *from, char *to, unsigned int flags);
99extern int do_statfs(char *root, long *bsize_out, long long *blocks_out,
100		     long long *bfree_out, long long *bavail_out,
101		     long long *files_out, long long *ffree_out,
102		     void *fsid_out, int fsid_size, long *namelen_out);
103
104#endif
105