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  */
40 struct hostfs_timespec {
41 	long long tv_sec;
42 	long long tv_nsec;
43 };
44 
45 struct 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 
56 struct 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 };
69 
70 extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
71 extern int access_file(char *path, int r, int w, int x);
72 extern int open_file(char *path, int r, int w, int append);
73 extern void *open_dir(char *path, int *err_out);
74 extern void seek_dir(void *stream, unsigned long long pos);
75 extern char *read_dir(void *stream, unsigned long long *pos_out,
76 		      unsigned long long *ino_out, int *len_out,
77 		      unsigned int *type_out);
78 extern void close_file(void *stream);
79 extern int replace_file(int oldfd, int fd);
80 extern void close_dir(void *stream);
81 extern int read_file(int fd, unsigned long long *offset, char *buf, int len);
82 extern int write_file(int fd, unsigned long long *offset, const char *buf,
83 		      int len);
84 extern int lseek_file(int fd, long long offset, int whence);
85 extern int fsync_file(int fd, int datasync);
86 extern int file_create(char *name, int mode);
87 extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
88 extern int make_symlink(const char *from, const char *to);
89 extern int unlink_file(const char *file);
90 extern int do_mkdir(const char *file, int mode);
91 extern int hostfs_do_rmdir(const char *file);
92 extern int do_mknod(const char *file, int mode, unsigned int major,
93 		    unsigned int minor);
94 extern int link_file(const char *to, const char *from);
95 extern int hostfs_do_readlink(char *file, char *buf, int size);
96 extern int rename_file(char *from, char *to);
97 extern int rename2_file(char *from, char *to, unsigned int flags);
98 extern int do_statfs(char *root, long *bsize_out, long long *blocks_out,
99 		     long long *bfree_out, long long *bavail_out,
100 		     long long *files_out, long long *ffree_out,
101 		     void *fsid_out, int fsid_size, long *namelen_out);
102 
103 #endif
104