fsdev/file-op-9p.h

   1 /*
   2  * 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
  14 #ifndef FILE_OP_9P_H
  15 #define FILE_OP_9P_H
  16
  17 #include <dirent.h>
  18 #include <utime.h>
  19 #include <sys/vfs.h>
  20
  21 #define SM_LOCAL_MODE_BITS    0600
  22 #define SM_LOCAL_DIR_MODE_BITS    0700
  23
  24 typedef struct FsCred
  25 {
  26     uid_t   fc_uid;
  27     gid_t   fc_gid;
  28     mode_t  fc_mode;
  29     dev_t   fc_rdev;
  30 } FsCred;
  31
  32 struct xattr_operations;
  33 struct FsContext;
  34 struct V9fsPath;
  35
  36 typedef struct extended_ops {
  37     int (*get_st_gen)(struct FsContext *, struct V9fsPath *,
  38                       mode_t, uint64_t *);
  39 } extended_ops;
  40
  41 /* export flags */
  42 #define V9FS_IMMEDIATE_WRITEOUT     0x00000001
  43 #define V9FS_PATHNAME_FSCONTEXT     0x00000002
  44 /*
  45  * uid/gid set on fileserver files
  46  */
  47 #define V9FS_SM_PASSTHROUGH         0x00000004
  48 /*
  49  * uid/gid part of xattr
  50  */
  51 #define V9FS_SM_MAPPED              0x00000008
  52 /*
  53  * Server will try to set uid/gid.
  54  * On failure ignore the error.
  55  */
  56 #define V9FS_SM_NONE                0x00000010
  57 /*
  58  * uid/gid part of .virtfs_meatadata namespace
  59  */
  60 #define V9FS_SM_MAPPED_FILE         0x00000020
  61 #define V9FS_RDONLY                 0x00000040
  62 #define V9FS_PROXY_SOCK_FD          0x00000080
  63 #define V9FS_PROXY_SOCK_NAME        0x00000100
  64
  65 #define V9FS_SEC_MASK               0x0000003C
  66
  67
  68 typedef struct FileOperations FileOperations;
  69 /*
  70  * Structure to store the various fsdev's passed through command line.
  71  */
  72 typedef struct FsDriverEntry {
  73     char *fsdev_id;
  74     char *path;
  75     int export_flags;
  76     FileOperations *ops;
  77 } FsDriverEntry;
  78
  79 typedef struct FsContext
  80 {
  81     uid_t uid;
  82     char *fs_root;
  83     int export_flags;
  84     struct xattr_operations **xops;
  85     struct extended_ops exops;
  86     /* fs driver specific data */
  87     void *private;
  88 } FsContext;
  89
  90 typedef struct V9fsPath {
  91     uint16_t size;
  92     char *data;
  93 } V9fsPath;
  94
  95 typedef union V9fsFidOpenState V9fsFidOpenState;
  96
  97 void cred_init(FsCred *);
  98
  99 struct FileOperations
 100 {
 101     int (*parse_opts)(QemuOpts *, struct FsDriverEntry *);
 102     int (*init)(struct FsContext *);
 103     int (*lstat)(FsContext *, V9fsPath *, struct stat *);
 104     ssize_t (*readlink)(FsContext *, V9fsPath *, char *, size_t);
 105     int (*chmod)(FsContext *, V9fsPath *, FsCred *);
 106     int (*chown)(FsContext *, V9fsPath *, FsCred *);
 107     int (*mknod)(FsContext *, V9fsPath *, const char *, FsCred *);
 108     int (*utimensat)(FsContext *, V9fsPath *, const struct timespec *);
 109     int (*remove)(FsContext *, const char *);
 110     int (*symlink)(FsContext *, const char *, V9fsPath *,
 111                    const char *, FsCred *);
 112     int (*link)(FsContext *, V9fsPath *, V9fsPath *, const char *);
 113     int (*setuid)(FsContext *, uid_t);
 114     int (*close)(FsContext *, V9fsFidOpenState *);
 115     int (*closedir)(FsContext *, V9fsFidOpenState *);
 116     int (*opendir)(FsContext *, V9fsPath *, V9fsFidOpenState *);
 117     int (*open)(FsContext *, V9fsPath *, int, V9fsFidOpenState *);
 118     int (*open2)(FsContext *, V9fsPath *, const char *,
 119                  int, FsCred *, V9fsFidOpenState *);
 120     void (*rewinddir)(FsContext *, V9fsFidOpenState *);
 121     off_t (*telldir)(FsContext *, V9fsFidOpenState *);
 122     struct dirent * (*readdir)(FsContext *, V9fsFidOpenState *);
 123     void (*seekdir)(FsContext *, V9fsFidOpenState *, off_t);
 124     ssize_t (*preadv)(FsContext *, V9fsFidOpenState *,
 125                       const struct iovec *, int, off_t);
 126     ssize_t (*pwritev)(FsContext *, V9fsFidOpenState *,
 127                        const struct iovec *, int, off_t);
 128     int (*mkdir)(FsContext *, V9fsPath *, const char *, FsCred *);
 129     int (*fstat)(FsContext *, int, V9fsFidOpenState *, struct stat *);
 130     int (*rename)(FsContext *, const char *, const char *);
 131     int (*truncate)(FsContext *, V9fsPath *, off_t);
 132     int (*fsync)(FsContext *, int, V9fsFidOpenState *, int);
 133     int (*statfs)(FsContext *s, V9fsPath *path, struct statfs *stbuf);
 134     ssize_t (*lgetxattr)(FsContext *, V9fsPath *,
 135                          const char *, void *, size_t);
 136     ssize_t (*llistxattr)(FsContext *, V9fsPath *, void *, size_t);
 137     int (*lsetxattr)(FsContext *, V9fsPath *,
 138                      const char *, void *, size_t, int);
 139     int (*lremovexattr)(FsContext *, V9fsPath *, const char *);
 140     int (*name_to_path)(FsContext *, V9fsPath *, const char *, V9fsPath *);
 141     int (*renameat)(FsContext *ctx, V9fsPath *olddir, const char *old_name,
 142                     V9fsPath *newdir, const char *new_name);
 143     int (*unlinkat)(FsContext *ctx, V9fsPath *dir, const char *name, int flags);
 144     void *opaque;
 145 };
 146
 147 #endif