LXR qemu/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
  26typedef struct FsCred
  27{
  28    uid_t   fc_uid;
  29    gid_t   fc_gid;
  30    mode_t  fc_mode;
  31    dev_t   fc_rdev;
  32} FsCred;
  33
  34struct xattr_operations;
  35struct FsContext;
  36struct V9fsPath;
  37
  38typedef struct extended_ops {
  39    int (*get_st_gen)(struct FsContext *, struct V9fsPath *,
  40                      mode_t, uint64_t *);
  41} extended_ops;
  42
  43/* export flags */
  44#define V9FS_IMMEDIATE_WRITEOUT     0x00000001
  45#define V9FS_PATHNAME_FSCONTEXT     0x00000002
  46/*
  47 * uid/gid set on fileserver files
  48 */
  49#define V9FS_SM_PASSTHROUGH         0x00000004
  50/*
  51 * uid/gid part of xattr
  52 */
  53#define V9FS_SM_MAPPED              0x00000008
  54/*
  55 * Server will try to set uid/gid.
  56 * On failure ignore the error.
  57 */
  58#define V9FS_SM_NONE                0x00000010
  59/*
  60 * uid/gid part of .virtfs_meatadata namespace
  61 */
  62#define V9FS_SM_MAPPED_FILE         0x00000020
  63#define V9FS_RDONLY                 0x00000040
  64#define V9FS_PROXY_SOCK_FD          0x00000080
  65#define V9FS_PROXY_SOCK_NAME        0x00000100
  66
  67#define V9FS_SEC_MASK               0x0000003C
  68
  69
  70typedef struct FileOperations FileOperations;
  71/*
  72 * Structure to store the various fsdev's passed through command line.
  73 */
  74typedef struct FsDriverEntry {
  75    char *fsdev_id;
  76    char *path;
  77    int export_flags;
  78    FileOperations *ops;
  79} FsDriverEntry;
  80
  81typedef struct FsContext
  82{
  83    uid_t uid;
  84    char *fs_root;
  85    int export_flags;
  86    struct xattr_operations **xops;
  87    struct extended_ops exops;
  88    /* fs driver specific data */
  89    void *private;
  90} FsContext;
  91
  92typedef struct V9fsPath {
  93    uint16_t size;
  94    char *data;
  95} V9fsPath;
  96
  97typedef union V9fsFidOpenState V9fsFidOpenState;
  98
  99void cred_init(FsCred *);
 100
 101struct FileOperations
 102{
 103    int (*parse_opts)(QemuOpts *, struct FsDriverEntry *);
 104    int (*init)(struct FsContext *);
 105    int (*lstat)(FsContext *, V9fsPath *, struct stat *);
 106    ssize_t (*readlink)(FsContext *, V9fsPath *, char *, size_t);
 107    int (*chmod)(FsContext *, V9fsPath *, FsCred *);
 108    int (*chown)(FsContext *, V9fsPath *, FsCred *);
 109    int (*mknod)(FsContext *, V9fsPath *, const char *, FsCred *);
 110    int (*utimensat)(FsContext *, V9fsPath *, const struct timespec *);
 111    int (*remove)(FsContext *, const char *);
 112    int (*symlink)(FsContext *, const char *, V9fsPath *,
 113                   const char *, FsCred *);
 114    int (*link)(FsContext *, V9fsPath *, V9fsPath *, const char *);
 115    int (*setuid)(FsContext *, uid_t);
 116    int (*close)(FsContext *, V9fsFidOpenState *);
 117    int (*closedir)(FsContext *, V9fsFidOpenState *);
 118    int (*opendir)(FsContext *, V9fsPath *, V9fsFidOpenState *);
 119    int (*open)(FsContext *, V9fsPath *, int, V9fsFidOpenState *);
 120    int (*open2)(FsContext *, V9fsPath *, const char *,
 121                 int, FsCred *, V9fsFidOpenState *);
 122    void (*rewinddir)(FsContext *, V9fsFidOpenState *);
 123    off_t (*telldir)(FsContext *, V9fsFidOpenState *);
 124    int (*readdir_r)(FsContext *, V9fsFidOpenState *,
 125                     struct dirent *, struct dirent **);
 126    void (*seekdir)(FsContext *, V9fsFidOpenState *, off_t);
 127    ssize_t (*preadv)(FsContext *, V9fsFidOpenState *,
 128                      const struct iovec *, int, off_t);
 129    ssize_t (*pwritev)(FsContext *, V9fsFidOpenState *,
 130                       const struct iovec *, int, off_t);
 131    int (*mkdir)(FsContext *, V9fsPath *, const char *, FsCred *);
 132    int (*fstat)(FsContext *, int, V9fsFidOpenState *, struct stat *);
 133    int (*rename)(FsContext *, const char *, const char *);
 134    int (*truncate)(FsContext *, V9fsPath *, off_t);
 135    int (*fsync)(FsContext *, int, V9fsFidOpenState *, int);
 136    int (*statfs)(FsContext *s, V9fsPath *path, struct statfs *stbuf);
 137    ssize_t (*lgetxattr)(FsContext *, V9fsPath *,
 138                         const char *, void *, size_t);
 139    ssize_t (*llistxattr)(FsContext *, V9fsPath *, void *, size_t);
 140    int (*lsetxattr)(FsContext *, V9fsPath *,
 141                     const char *, void *, size_t, int);
 142    int (*lremovexattr)(FsContext *, V9fsPath *, const char *);
 143    int (*name_to_path)(FsContext *, V9fsPath *, const char *, V9fsPath *);
 144    int (*renameat)(FsContext *ctx, V9fsPath *olddir, const char *old_name,
 145                    V9fsPath *newdir, const char *new_name);
 146    int (*unlinkat)(FsContext *ctx, V9fsPath *dir, const char *name, int flags);
 147    void *opaque;
 148};
 149
 150#endif
 151