LXR qemu/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
  24typedef 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
  32struct xattr_operations;
  33struct FsContext;
  34struct V9fsPath;
  35
  36typedef 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
  68typedef struct FileOperations FileOperations;
  69/*
  70 * Structure to store the various fsdev's passed through command line.
  71 */
  72typedef struct FsDriverEntry {
  73    char *fsdev_id;
  74    char *path;
  75    int export_flags;
  76    FileOperations *ops;
  77} FsDriverEntry;
  78
  79typedef 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
  90typedef struct V9fsPath {
  91    uint16_t size;
  92    char *data;
  93} V9fsPath;
  94
  95typedef union V9fsFidOpenState V9fsFidOpenState;
  96
  97void cred_init(FsCred *);
  98
  99struct FileOperations
 100{
 101    int (*parse_opts)(QemuOpts *, struct FsDriverEntry *);
 102    int (*init)(struct FsContext *);
 103    void (*cleanup)(struct FsContext *);
 104    int (*lstat)(FsContext *, V9fsPath *, struct stat *);
 105    ssize_t (*readlink)(FsContext *, V9fsPath *, char *, size_t);
 106    int (*chmod)(FsContext *, V9fsPath *, FsCred *);
 107    int (*chown)(FsContext *, V9fsPath *, FsCred *);
 108    int (*mknod)(FsContext *, V9fsPath *, const char *, FsCred *);
 109    int (*utimensat)(FsContext *, V9fsPath *, const struct timespec *);
 110    int (*remove)(FsContext *, const char *);
 111    int (*symlink)(FsContext *, const char *, V9fsPath *,
 112                   const char *, FsCred *);
 113    int (*link)(FsContext *, V9fsPath *, V9fsPath *, const char *);
 114    int (*setuid)(FsContext *, uid_t);
 115    int (*close)(FsContext *, V9fsFidOpenState *);
 116    int (*closedir)(FsContext *, V9fsFidOpenState *);
 117    int (*opendir)(FsContext *, V9fsPath *, V9fsFidOpenState *);
 118    int (*open)(FsContext *, V9fsPath *, int, V9fsFidOpenState *);
 119    int (*open2)(FsContext *, V9fsPath *, const char *,
 120                 int, FsCred *, V9fsFidOpenState *);
 121    void (*rewinddir)(FsContext *, V9fsFidOpenState *);
 122    off_t (*telldir)(FsContext *, V9fsFidOpenState *);
 123    struct dirent * (*readdir)(FsContext *, V9fsFidOpenState *);
 124    void (*seekdir)(FsContext *, V9fsFidOpenState *, off_t);
 125    ssize_t (*preadv)(FsContext *, V9fsFidOpenState *,
 126                      const struct iovec *, int, off_t);
 127    ssize_t (*pwritev)(FsContext *, V9fsFidOpenState *,
 128                       const struct iovec *, int, off_t);
 129    int (*mkdir)(FsContext *, V9fsPath *, const char *, FsCred *);
 130    int (*fstat)(FsContext *, int, V9fsFidOpenState *, struct stat *);
 131    int (*rename)(FsContext *, const char *, const char *);
 132    int (*truncate)(FsContext *, V9fsPath *, off_t);
 133    int (*fsync)(FsContext *, int, V9fsFidOpenState *, int);
 134    int (*statfs)(FsContext *s, V9fsPath *path, struct statfs *stbuf);
 135    ssize_t (*lgetxattr)(FsContext *, V9fsPath *,
 136                         const char *, void *, size_t);
 137    ssize_t (*llistxattr)(FsContext *, V9fsPath *, void *, size_t);
 138    int (*lsetxattr)(FsContext *, V9fsPath *,
 139                     const char *, void *, size_t, int);
 140    int (*lremovexattr)(FsContext *, V9fsPath *, const char *);
 141    int (*name_to_path)(FsContext *, V9fsPath *, const char *, V9fsPath *);
 142    int (*renameat)(FsContext *ctx, V9fsPath *olddir, const char *old_name,
 143                    V9fsPath *newdir, const char *new_name);
 144    int (*unlinkat)(FsContext *ctx, V9fsPath *dir, const char *name, int flags);
 145    void *opaque;
 146};
 147
 148#endif
 149