fsdev/file-op-9p.h

   1 /*
   2  * Virtio 9p
   3  *
   4  * Copyright IBM, Corp. 2010
   5  *
   6  * Authors:
   7  *  Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  */
  13 #ifndef _FILEOP_H
  14 #define _FILEOP_H
  15 #include <sys/types.h>
  16 #include <dirent.h>
  17 #include <sys/time.h>
  18 #include <utime.h>
  19 #include <sys/stat.h>
  20 #include <sys/uio.h>
  21 #include <sys/vfs.h>
  22
  23 #define SM_LOCAL_MODE_BITS    0600
  24 #define SM_LOCAL_DIR_MODE_BITS    0700
  25
  26 typedef enum
  27 {
  28     /*
  29      * Server will try to set uid/gid.
  30      * On failure ignore the error.
  31      */
  32     SM_NONE = 0,
  33     /*
  34      * uid/gid set on fileserver files
  35      */
  36     SM_PASSTHROUGH = 1,
  37     /*
  38      * uid/gid part of xattr
  39      */
  40     SM_MAPPED,
  41 } SecModel;
  42
  43 typedef struct FsCred
  44 {
  45     uid_t   fc_uid;
  46     gid_t   fc_gid;
  47     mode_t  fc_mode;
  48     dev_t   fc_rdev;
  49 } FsCred;
  50
  51 struct xattr_operations;
  52
  53 typedef struct FsContext
  54 {
  55     char *fs_root;
  56     SecModel fs_sm;
  57     uid_t uid;
  58     struct xattr_operations **xops;
  59 } FsContext;
  60
  61 typedef struct V9fsPath {
  62     int16_t size;
  63     char *data;
  64 } V9fsPath;
  65
  66 void cred_init(FsCred *);
  67
  68 typedef struct FileOperations
  69 {
  70     int (*init)(struct FsContext *);
  71     int (*lstat)(FsContext *, V9fsPath *, struct stat *);
  72     ssize_t (*readlink)(FsContext *, V9fsPath *, char *, size_t);
  73     int (*chmod)(FsContext *, V9fsPath *, FsCred *);
  74     int (*chown)(FsContext *, V9fsPath *, FsCred *);
  75     int (*mknod)(FsContext *, V9fsPath *, const char *, FsCred *);
  76     int (*utimensat)(FsContext *, V9fsPath *, const struct timespec *);
  77     int (*remove)(FsContext *, const char *);
  78     int (*symlink)(FsContext *, const char *, V9fsPath *,
  79                    const char *, FsCred *);
  80     int (*link)(FsContext *, V9fsPath *, V9fsPath *, const char *);
  81     int (*setuid)(FsContext *, uid_t);
  82     int (*close)(FsContext *, int);
  83     int (*closedir)(FsContext *, DIR *);
  84     DIR *(*opendir)(FsContext *, V9fsPath *);
  85     int (*open)(FsContext *, V9fsPath *, int);
  86     int (*open2)(FsContext *, V9fsPath *, const char *, int, FsCred *);
  87     void (*rewinddir)(FsContext *, DIR *);
  88     off_t (*telldir)(FsContext *, DIR *);
  89     int (*readdir_r)(FsContext *, DIR *, struct dirent *, struct dirent **);
  90     void (*seekdir)(FsContext *, DIR *, off_t);
  91     ssize_t (*preadv)(FsContext *, int, const struct iovec *, int, off_t);
  92     ssize_t (*pwritev)(FsContext *, int, const struct iovec *, int, off_t);
  93     int (*mkdir)(FsContext *, V9fsPath *, const char *, FsCred *);
  94     int (*fstat)(FsContext *, int, struct stat *);
  95     int (*rename)(FsContext *, const char *, const char *);
  96     int (*truncate)(FsContext *, V9fsPath *, off_t);
  97     int (*fsync)(FsContext *, int, int);
  98     int (*statfs)(FsContext *s, V9fsPath *path, struct statfs *stbuf);
  99     ssize_t (*lgetxattr)(FsContext *, V9fsPath *,
 100                          const char *, void *, size_t);
 101     ssize_t (*llistxattr)(FsContext *, V9fsPath *, void *, size_t);
 102     int (*lsetxattr)(FsContext *, V9fsPath *,
 103                      const char *, void *, size_t, int);
 104     int (*lremovexattr)(FsContext *, V9fsPath *, const char *);
 105     int (*name_to_path)(FsContext *, V9fsPath *, const char *, V9fsPath *);
 106     int (*renameat)(FsContext *ctx, V9fsPath *olddir, const char *old_name,
 107                     V9fsPath *newdir, const char *new_name);
 108     int (*unlinkat)(FsContext *ctx, V9fsPath *dir, const char *name, int flags);
 109     void *opaque;
 110 } FileOperations;
 111
 112 #endif