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 /* FsContext flag values */
  54 #define PATHNAME_FSCONTEXT 0x1
  55
  56 typedef struct FsContext
  57 {
  58     int flags;
  59     char *fs_root;
  60     SecModel fs_sm;
  61     uid_t uid;
  62     struct xattr_operations **xops;
  63     /* fs driver specific data */
  64     void *private;
  65 } FsContext;
  66
  67 typedef struct V9fsPath {
  68     int16_t size;
  69     char *data;
  70 } V9fsPath;
  71
  72 void cred_init(FsCred *);
  73
  74 typedef struct FileOperations
  75 {
  76     int (*init)(struct FsContext *);
  77     int (*lstat)(FsContext *, V9fsPath *, struct stat *);
  78     ssize_t (*readlink)(FsContext *, V9fsPath *, char *, size_t);
  79     int (*chmod)(FsContext *, V9fsPath *, FsCred *);
  80     int (*chown)(FsContext *, V9fsPath *, FsCred *);
  81     int (*mknod)(FsContext *, V9fsPath *, const char *, FsCred *);
  82     int (*utimensat)(FsContext *, V9fsPath *, const struct timespec *);
  83     int (*remove)(FsContext *, const char *);
  84     int (*symlink)(FsContext *, const char *, V9fsPath *,
  85                    const char *, FsCred *);
  86     int (*link)(FsContext *, V9fsPath *, V9fsPath *, const char *);
  87     int (*setuid)(FsContext *, uid_t);
  88     int (*close)(FsContext *, int);
  89     int (*closedir)(FsContext *, DIR *);
  90     DIR *(*opendir)(FsContext *, V9fsPath *);
  91     int (*open)(FsContext *, V9fsPath *, int);
  92     int (*open2)(FsContext *, V9fsPath *, const char *, int, FsCred *);
  93     void (*rewinddir)(FsContext *, DIR *);
  94     off_t (*telldir)(FsContext *, DIR *);
  95     int (*readdir_r)(FsContext *, DIR *, struct dirent *, struct dirent **);
  96     void (*seekdir)(FsContext *, DIR *, off_t);
  97     ssize_t (*preadv)(FsContext *, int, const struct iovec *, int, off_t);
  98     ssize_t (*pwritev)(FsContext *, int, const struct iovec *, int, off_t);
  99     int (*mkdir)(FsContext *, V9fsPath *, const char *, FsCred *);
 100     int (*fstat)(FsContext *, int, struct stat *);
 101     int (*rename)(FsContext *, const char *, const char *);
 102     int (*truncate)(FsContext *, V9fsPath *, off_t);
 103     int (*fsync)(FsContext *, int, int);
 104     int (*statfs)(FsContext *s, V9fsPath *path, struct statfs *stbuf);
 105     ssize_t (*lgetxattr)(FsContext *, V9fsPath *,
 106                          const char *, void *, size_t);
 107     ssize_t (*llistxattr)(FsContext *, V9fsPath *, void *, size_t);
 108     int (*lsetxattr)(FsContext *, V9fsPath *,
 109                      const char *, void *, size_t, int);
 110     int (*lremovexattr)(FsContext *, V9fsPath *, const char *);
 111     int (*name_to_path)(FsContext *, V9fsPath *, const char *, V9fsPath *);
 112     int (*renameat)(FsContext *ctx, V9fsPath *olddir, const char *old_name,
 113                     V9fsPath *newdir, const char *new_name);
 114     int (*unlinkat)(FsContext *ctx, V9fsPath *dir, const char *name, int flags);
 115     void *opaque;
 116 } FileOperations;
 117
 118 #endif