LXR linux/fs/hostfs/hostfs.h

   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/* These two are 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
  41struct 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
  52struct 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
  66extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
  67extern int access_file(char *path, int r, int w, int x);
  68extern int open_file(char *path, int r, int w, int append);
  69extern void *open_dir(char *path, int *err_out);
  70extern void seek_dir(void *stream, unsigned long long pos);
  71extern char *read_dir(void *stream, unsigned long long *pos_out,
  72                      unsigned long long *ino_out, int *len_out,
  73                      unsigned int *type_out);
  74extern void close_file(void *stream);
  75extern int replace_file(int oldfd, int fd);
  76extern void close_dir(void *stream);
  77extern int read_file(int fd, unsigned long long *offset, char *buf, int len);
  78extern int write_file(int fd, unsigned long long *offset, const char *buf,
  79                      int len);
  80extern int lseek_file(int fd, long long offset, int whence);
  81extern int fsync_file(int fd, int datasync);
  82extern int file_create(char *name, int mode);
  83extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
  84extern int make_symlink(const char *from, const char *to);
  85extern int unlink_file(const char *file);
  86extern int do_mkdir(const char *file, int mode);
  87extern int hostfs_do_rmdir(const char *file);
  88extern int do_mknod(const char *file, int mode, unsigned int major,
  89                    unsigned int minor);
  90extern int link_file(const char *from, const char *to);
  91extern int hostfs_do_readlink(char *file, char *buf, int size);
  92extern int rename_file(char *from, char *to);
  93extern int rename2_file(char *from, char *to, unsigned int flags);
  94extern 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
 100