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 #define SM_LOCAL_MODE_BITS    0600
  23 #define SM_LOCAL_DIR_MODE_BITS    0700
  24
  25 typedef enum
  26 {
  27     /*
  28      * Server will try to set uid/gid.
  29      * On failure ignore the error.
  30      */
  31     SM_NONE = 0,
  32     /*
  33      * uid/gid set on fileserver files
  34      */
  35     SM_PASSTHROUGH = 1,
  36     /*
  37      * uid/gid part of xattr
  38      */
  39     SM_MAPPED,
  40 } SecModel;
  41
  42 typedef struct FsCred
  43 {
  44     uid_t   fc_uid;
  45     gid_t   fc_gid;
  46     mode_t  fc_mode;
  47     dev_t   fc_rdev;
  48 } FsCred;
  49
  50 struct xattr_operations;
  51
  52 typedef struct FsContext
  53 {
  54     char *fs_root;
  55     SecModel fs_sm;
  56     uid_t uid;
  57     struct xattr_operations **xops;
  58 } FsContext;
  59
  60 typedef struct V9fsPath {
  61     int16_t size;
  62     char *data;
  63 } V9fsPath;
  64
  65 void cred_init(FsCred *);
  66
  67 typedef struct FileOperations
  68 {
  69     int (*lstat)(FsContext *, V9fsPath *, struct stat *);
  70     ssize_t (*readlink)(FsContext *, V9fsPath *, char *, size_t);
  71     int (*chmod)(FsContext *, V9fsPath *, FsCred *);
  72     int (*chown)(FsContext *, V9fsPath *, FsCred *);
  73     int (*mknod)(FsContext *, V9fsPath *, const char *, FsCred *);
  74     int (*utimensat)(FsContext *, V9fsPath *, const struct timespec *);
  75     int (*remove)(FsContext *, const char *);
  76     int (*symlink)(FsContext *, const char *, V9fsPath *,
  77                    const char *, FsCred *);
  78     int (*link)(FsContext *, V9fsPath *, V9fsPath *, const char *);
  79     int (*setuid)(FsContext *, uid_t);
  80     int (*close)(FsContext *, int);
  81     int (*closedir)(FsContext *, DIR *);
  82     DIR *(*opendir)(FsContext *, V9fsPath *);
  83     int (*open)(FsContext *, V9fsPath *, int);
  84     int (*open2)(FsContext *, V9fsPath *, const char *, int, FsCred *);
  85     void (*rewinddir)(FsContext *, DIR *);
  86     off_t (*telldir)(FsContext *, DIR *);
  87     int (*readdir_r)(FsContext *, DIR *, struct dirent *, struct dirent **);
  88     void (*seekdir)(FsContext *, DIR *, off_t);
  89     ssize_t (*preadv)(FsContext *, int, const struct iovec *, int, off_t);
  90     ssize_t (*pwritev)(FsContext *, int, const struct iovec *, int, off_t);
  91     int (*mkdir)(FsContext *, V9fsPath *, const char *, FsCred *);
  92     int (*fstat)(FsContext *, int, struct stat *);
  93     int (*rename)(FsContext *, const char *, const char *);
  94     int (*truncate)(FsContext *, V9fsPath *, off_t);
  95     int (*fsync)(FsContext *, int, int);
  96     int (*statfs)(FsContext *s, V9fsPath *path, struct statfs *stbuf);
  97     ssize_t (*lgetxattr)(FsContext *, V9fsPath *,
  98                          const char *, void *, size_t);
  99     ssize_t (*llistxattr)(FsContext *, V9fsPath *, void *, size_t);
 100     int (*lsetxattr)(FsContext *, V9fsPath *,
 101                      const char *, void *, size_t, int);
 102     int (*lremovexattr)(FsContext *, V9fsPath *, const char *);
 103     int (*name_to_path)(FsContext *, V9fsPath *, const char *, V9fsPath *);
 104     int (*renameat)(FsContext *ctx, V9fsPath *olddir, const char *old_name,
 105                     V9fsPath *newdir, const char *new_name);
 106     int (*unlinkat)(FsContext *ctx, V9fsPath *dir, const char *name, int flags);
 107     void *opaque;
 108 } FileOperations;
 109
 110 #endif