root/fs/hostfs/hostfs.h

INCLUDED FROM

   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 
  41 struct hostfs_iattr {
  42         unsigned int    ia_valid;
  43         unsigned short  ia_mode;
  44         uid_t           ia_uid;
  45         gid_t           ia_gid;
  46         loff_t          ia_size;
  47         struct timespec ia_atime;
  48         struct timespec ia_mtime;
  49         struct timespec ia_ctime;
  50 };
  51 
  52 struct hostfs_stat {
  53         unsigned long long ino;
  54         unsigned int mode;
  55         unsigned int nlink;
  56         unsigned int uid;
  57         unsigned int gid;
  58         unsigned long long size;
  59         struct timespec atime, mtime, ctime;
  60         unsigned int blksize;
  61         unsigned long long blocks;
  62         unsigned int maj;
  63         unsigned int min;
  64 };
  65 
  66 extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
  67 extern int access_file(char *path, int r, int w, int x);
  68 extern int open_file(char *path, int r, int w, int append);
  69 extern void *open_dir(char *path, int *err_out);
  70 extern void seek_dir(void *stream, unsigned long long pos);
  71 extern char *read_dir(void *stream, unsigned long long *pos_out,
  72                       unsigned long long *ino_out, int *len_out,
  73                       unsigned int *type_out);
  74 extern void close_file(void *stream);
  75 extern int replace_file(int oldfd, int fd);
  76 extern void close_dir(void *stream);
  77 extern int read_file(int fd, unsigned long long *offset, char *buf, int len);
  78 extern int write_file(int fd, unsigned long long *offset, const char *buf,
  79                       int len);
  80 extern int lseek_file(int fd, long long offset, int whence);
  81 extern int fsync_file(int fd, int datasync);
  82 extern int file_create(char *name, int mode);
  83 extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
  84 extern int make_symlink(const char *from, const char *to);
  85 extern int unlink_file(const char *file);
  86 extern int do_mkdir(const char *file, int mode);
  87 extern int hostfs_do_rmdir(const char *file);
  88 extern int do_mknod(const char *file, int mode, unsigned int major,
  89                     unsigned int minor);
  90 extern int link_file(const char *to, const char *from);
  91 extern int hostfs_do_readlink(char *file, char *buf, int size);
  92 extern int rename_file(char *from, char *to);
  93 extern int rename2_file(char *from, char *to, unsigned int flags);
  94 extern int do_statfs(char *root, long *bsize_out, long long *blocks_out,
  95                      long long *bfree_out, long long *bavail_out,
  96                      long long *files_out, long long *ffree_out,
  97                      void *fsid_out, int fsid_size, long *namelen_out);
  98 
  99 #endif