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 <dirent.h>
  16#include <utime.h>
  17#include <sys/uio.h>
  18#include <sys/vfs.h>
  19
  20#define SM_LOCAL_MODE_BITS    0600
  21#define SM_LOCAL_DIR_MODE_BITS    0700
  22
  23typedef struct FsCred
  24{
  25    uid_t   fc_uid;
  26    gid_t   fc_gid;
  27    mode_t  fc_mode;
  28    dev_t   fc_rdev;
  29} FsCred;
  30
  31struct xattr_operations;
  32struct FsContext;
  33struct V9fsPath;
  34
  35typedef struct extended_ops {
  36    int (*get_st_gen)(struct FsContext *, struct V9fsPath *,
  37                      mode_t, uint64_t *);
  38} extended_ops;
  39
  40/* export flags */
  41#define V9FS_IMMEDIATE_WRITEOUT     0x00000001
  42#define V9FS_PATHNAME_FSCONTEXT     0x00000002
  43/*
  44 * uid/gid set on fileserver files
  45 */
  46#define V9FS_SM_PASSTHROUGH         0x00000004
  47/*
  48 * uid/gid part of xattr
  49 */
  50#define V9FS_SM_MAPPED              0x00000008
  51/*
  52 * Server will try to set uid/gid.
  53 * On failure ignore the error.
  54 */
  55#define V9FS_SM_NONE                0x00000010
  56/*
  57 * uid/gid part of .virtfs_meatadata namespace
  58 */
  59#define V9FS_SM_MAPPED_FILE         0x00000020
  60#define V9FS_RDONLY                 0x00000040
  61#define V9FS_PROXY_SOCK_FD          0x00000080
  62#define V9FS_PROXY_SOCK_NAME        0x00000100
  63
  64#define V9FS_SEC_MASK               0x0000003C
  65
  66
  67typedef struct FileOperations FileOperations;
  68/*
  69 * Structure to store the various fsdev's passed through command line.
  70 */
  71typedef struct FsDriverEntry {
  72    char *fsdev_id;
  73    char *path;
  74    int export_flags;
  75    FileOperations *ops;
  76} FsDriverEntry;
  77
  78typedef struct FsContext
  79{
  80    uid_t uid;
  81    char *fs_root;
  82    int export_flags;
  83    struct xattr_operations **xops;
  84    struct extended_ops exops;
  85    /* fs driver specific data */
  86    void *private;
  87} FsContext;
  88
  89typedef struct V9fsPath {
  90    uint16_t size;
  91    char *data;
  92} V9fsPath;
  93
  94typedef union V9fsFidOpenState V9fsFidOpenState;
  95
  96void cred_init(FsCred *);
  97
  98struct FileOperations
  99{
 100    int (*parse_opts)(QemuOpts *, struct FsDriverEntry *);
 101    int (*init)(struct FsContext *);
 102    int (*lstat)(FsContext *, V9fsPath *, struct stat *);
 103    ssize_t (*readlink)(FsContext *, V9fsPath *, char *, size_t);
 104    int (*chmod)(FsContext *, V9fsPath *, FsCred *);
 105    int (*chown)(FsContext *, V9fsPath *, FsCred *);
 106    int (*mknod)(FsContext *, V9fsPath *, const char *, FsCred *);
 107    int (*utimensat)(FsContext *, V9fsPath *, const struct timespec *);
 108    int (*remove)(FsContext *, const char *);
 109    int (*symlink)(FsContext *, const char *, V9fsPath *,
 110                   const char *, FsCred *);
 111    int (*link)(FsContext *, V9fsPath *, V9fsPath *, const char *);
 112    int (*setuid)(FsContext *, uid_t);
 113    int (*close)(FsContext *, V9fsFidOpenState *);
 114    int (*closedir)(FsContext *, V9fsFidOpenState *);
 115    int (*opendir)(FsContext *, V9fsPath *, V9fsFidOpenState *);
 116    int (*open)(FsContext *, V9fsPath *, int, V9fsFidOpenState *);
 117    int (*open2)(FsContext *, V9fsPath *, const char *,
 118                 int, FsCred *, V9fsFidOpenState *);
 119    void (*rewinddir)(FsContext *, V9fsFidOpenState *);
 120    off_t (*telldir)(FsContext *, V9fsFidOpenState *);
 121    int (*readdir_r)(FsContext *, V9fsFidOpenState *,
 122                     struct dirent *, struct dirent **);
 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
 148