fs/hostfs/hostfs.h

   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 in this patch:
  32  *
  33  * http://linux.bkbits.net:8080/linux-2.5/
  34  * cset@3caf4a12k4XgDzK7wyK-TGpSZ9u2Ww?nav=index.html
  35  * |src/.|src/include|src/include/linux|related/include/linux/fs.h
  36  *
  37  * Actually, they are not needed by most ->setattr() methods - they are set by
  38  * callers of notify_change() to notify that the setuid/setgid bits must be
  39  * dropped.
  40  * notify_change() will delete those flags, make sure attr->ia_valid & ATTR_MODE
  41  * is on, and remove the appropriate bits from attr->ia_mode (attr is a
  42  * "struct iattr *"). -BlaisorBlade
  43  */
  44
  45 struct hostfs_iattr {
  46         unsigned int    ia_valid;
  47         mode_t          ia_mode;
  48         uid_t           ia_uid;
  49         gid_t           ia_gid;
  50         loff_t          ia_size;
  51         struct timespec ia_atime;
  52         struct timespec ia_mtime;
  53         struct 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 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 int file_type(const char *path, int *maj, int *min);
  74 extern void *open_dir(char *path, int *err_out);
  75 extern char *read_dir(void *stream, unsigned long long *pos,
  76                       unsigned long long *ino_out, int *len_out);
  77 extern void close_file(void *stream);
  78 extern void close_dir(void *stream);
  79 extern int read_file(int fd, unsigned long long *offset, char *buf, int len);
  80 extern int write_file(int fd, unsigned long long *offset, const char *buf,
  81                       int len);
  82 extern int lseek_file(int fd, long long offset, int whence);
  83 extern int fsync_file(int fd, int datasync);
  84 extern int file_create(char *name, int ur, int uw, int ux, int gr,
  85                        int gw, int gx, int or, int ow, int ox);
  86 extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
  87 extern int make_symlink(const char *from, const char *to);
  88 extern int unlink_file(const char *file);
  89 extern int do_mkdir(const char *file, int mode);
  90 extern int do_rmdir(const char *file);
  91 extern int do_mknod(const char *file, int mode, unsigned int major,
  92                     unsigned int minor);
  93 extern int link_file(const char *from, const char *to);
  94 extern int hostfs_do_readlink(char *file, char *buf, int size);
  95 extern int rename_file(char *from, char *to);
  96 extern int do_statfs(char *root, long *bsize_out, long long *blocks_out,
  97                      long long *bfree_out, long long *bavail_out,
  98                      long long *files_out, long long *ffree_out,
  99                      void *fsid_out, int fsid_size, long *namelen_out,
 100                      long *spare_out);
 101
 102 #endif