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