hostfs.h

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#ifndef __UM_FS_HOSTFS
#define __UM_FS_HOSTFS

#include <os.h>

/*
 * These are exactly the same definitions as in fs.h, but the names are
 * changed so that this file can be included in both kernel and user files.
 */

#define HOSTFS_ATTR_MODE    1
#define HOSTFS_ATTR_UID     2
#define HOSTFS_ATTR_GID     4
#define HOSTFS_ATTR_SIZE    8
#define HOSTFS_ATTR_ATIME   16
#define HOSTFS_ATTR_MTIME   32
#define HOSTFS_ATTR_CTIME   64
#define HOSTFS_ATTR_ATIME_SET   128
#define HOSTFS_ATTR_MTIME_SET   256

/* These two are unused by hostfs. */
#define HOSTFS_ATTR_FORCE   512 /* Not a change, but a change it */
#define HOSTFS_ATTR_ATTR_FLAG   1024

/*
 * If you are very careful, you'll notice that these two are missing:
 *
 * #define ATTR_KILL_SUID   2048
 * #define ATTR_KILL_SGID   4096
 *
 * and this is because they were added in 2.5 development.
 * Actually, they are not needed by most ->setattr() methods - they are set by
 * callers of notify_change() to notify that the setuid/setgid bits must be
 * dropped.
 * notify_change() will delete those flags, make sure attr->ia_valid & ATTR_MODE
 * is on, and remove the appropriate bits from attr->ia_mode (attr is a
 * "struct iattr *"). -BlaisorBlade
 */

struct hostfs_iattr {
    unsigned int    ia_valid;
    unsigned short  ia_mode;
    uid_t       ia_uid;
    gid_t       ia_gid;
    loff_t      ia_size;
    struct timespec ia_atime;
    struct timespec ia_mtime;
    struct timespec ia_ctime;
};

struct hostfs_stat {
    unsigned long long ino;
    unsigned int mode;
    unsigned int nlink;
    unsigned int uid;
    unsigned int gid;
    unsigned long long size;
    struct timespec atime, mtime, ctime;
    unsigned int blksize;
    unsigned long long blocks;
    unsigned int maj;
    unsigned int min;
};

extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
extern int access_file(char *path, int r, int w, int x);
extern int open_file(char *path, int r, int w, int append);
extern void *open_dir(char *path, int *err_out);
extern char *read_dir(void *stream, unsigned long long *pos,
              unsigned long long *ino_out, int *len_out,
              unsigned int *type_out);
extern void close_file(void *stream);
extern int replace_file(int oldfd, int fd);
extern void close_dir(void *stream);
extern int read_file(int fd, unsigned long long *offset, char *buf, int len);
extern int write_file(int fd, unsigned long long *offset, const char *buf,
              int len);
extern int lseek_file(int fd, long long offset, int whence);
extern int fsync_file(int fd, int datasync);
extern int file_create(char *name, int ur, int uw, int ux, int gr,
               int gw, int gx, int or, int ow, int ox);
extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
extern int make_symlink(const char *from, const char *to);
extern int unlink_file(const char *file);
extern int do_mkdir(const char *file, int mode);
extern int do_rmdir(const char *file);
extern int do_mknod(const char *file, int mode, unsigned int major,
            unsigned int minor);
extern int link_file(const char *from, const char *to);
extern int hostfs_do_readlink(char *file, char *buf, int size);
extern int rename_file(char *from, char *to);
extern int do_statfs(char *root, long *bsize_out, long long *blocks_out,
             long long *bfree_out, long long *bavail_out,
             long long *files_out, long long *ffree_out,
             void *fsid_out, int fsid_size, long *namelen_out);

#endif