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#include "qemu-fsdev-throttle.h"
  21
  22#define SM_LOCAL_MODE_BITS    0600
  23#define SM_LOCAL_DIR_MODE_BITS    0700
  24
  25typedef struct FsCred {
  26    uid_t   fc_uid;
  27    gid_t   fc_gid;
  28    mode_t  fc_mode;
  29    dev_t   fc_rdev;
  30} FsCred;
  31
  32typedef struct FsContext FsContext;
  33typedef struct V9fsPath V9fsPath;
  34
  35typedef struct ExtendedOps {
  36    int (*get_st_gen)(FsContext *, V9fsPath *, mode_t, uint64_t *);
  37} ExtendedOps;
  38
  39/* export flags */
  40#define V9FS_IMMEDIATE_WRITEOUT     0x00000001
  41#define V9FS_PATHNAME_FSCONTEXT     0x00000002
  42/*
  43 * uid/gid set on fileserver files
  44 */
  45#define V9FS_SM_PASSTHROUGH         0x00000004
  46/*
  47 * uid/gid part of xattr
  48 */
  49#define V9FS_SM_MAPPED              0x00000008
  50/*
  51 * Server will try to set uid/gid.
  52 * On failure ignore the error.
  53 */
  54#define V9FS_SM_NONE                0x00000010
  55/*
  56 * uid/gid part of .virtfs_meatadata namespace
  57 */
  58#define V9FS_SM_MAPPED_FILE         0x00000020
  59#define V9FS_RDONLY                 0x00000040
  60#define V9FS_PROXY_SOCK_FD          0x00000080
  61#define V9FS_PROXY_SOCK_NAME        0x00000100
  62/*
  63 * multidevs option (either one of the two applies exclusively)
  64 */
  65#define V9FS_REMAP_INODES           0x00000200
  66#define V9FS_FORBID_MULTIDEVS       0x00000400
  67
  68#define V9FS_SEC_MASK               0x0000003C
  69
  70
  71typedef struct FileOperations FileOperations;
  72typedef struct XattrOperations XattrOperations;
  73
  74/*
  75 * Structure to store the various fsdev's passed through command line.
  76 */
  77typedef struct FsDriverEntry {
  78    char *fsdev_id;
  79    char *path;
  80    int export_flags;
  81    FileOperations *ops;
  82    FsThrottle fst;
  83    mode_t fmode;
  84    mode_t dmode;
  85} FsDriverEntry;
  86
  87struct FsContext {
  88    uid_t uid;
  89    char *fs_root;
  90    int export_flags;
  91    XattrOperations **xops;
  92    ExtendedOps exops;
  93    FsThrottle *fst;
  94    /* fs driver specific data */
  95    void *private;
  96    mode_t fmode;
  97    mode_t dmode;
  98};
  99
 100struct V9fsPath {
 101    uint16_t size;
 102    char *data;
 103};
 104
 105typedef union V9fsFidOpenState V9fsFidOpenState;
 106
 107void cred_init(FsCred *);
 108
 109struct FileOperations
 110{
 111    int (*parse_opts)(QemuOpts *, FsDriverEntry *, Error **errp);
 112    int (*init)(FsContext *, Error **errp);
 113    void (*cleanup)(FsContext *);
 114    int (*lstat)(FsContext *, V9fsPath *, struct stat *);
 115    ssize_t (*readlink)(FsContext *, V9fsPath *, char *, size_t);
 116    int (*chmod)(FsContext *, V9fsPath *, FsCred *);
 117    int (*chown)(FsContext *, V9fsPath *, FsCred *);
 118    int (*mknod)(FsContext *, V9fsPath *, const char *, FsCred *);
 119    int (*utimensat)(FsContext *, V9fsPath *, const struct timespec *);
 120    int (*remove)(FsContext *, const char *);
 121    int (*symlink)(FsContext *, const char *, V9fsPath *,
 122                   const char *, FsCred *);
 123    int (*link)(FsContext *, V9fsPath *, V9fsPath *, const char *);
 124    int (*setuid)(FsContext *, uid_t);
 125    int (*close)(FsContext *, V9fsFidOpenState *);
 126    int (*closedir)(FsContext *, V9fsFidOpenState *);
 127    int (*opendir)(FsContext *, V9fsPath *, V9fsFidOpenState *);
 128    int (*open)(FsContext *, V9fsPath *, int, V9fsFidOpenState *);
 129    int (*open2)(FsContext *, V9fsPath *, const char *,
 130                 int, FsCred *, V9fsFidOpenState *);
 131    void (*rewinddir)(FsContext *, V9fsFidOpenState *);
 132    off_t (*telldir)(FsContext *, V9fsFidOpenState *);
 133    struct dirent * (*readdir)(FsContext *, V9fsFidOpenState *);
 134    void (*seekdir)(FsContext *, V9fsFidOpenState *, off_t);
 135    ssize_t (*preadv)(FsContext *, V9fsFidOpenState *,
 136                      const struct iovec *, int, off_t);
 137    ssize_t (*pwritev)(FsContext *, V9fsFidOpenState *,
 138                       const struct iovec *, int, off_t);
 139    int (*mkdir)(FsContext *, V9fsPath *, const char *, FsCred *);
 140    int (*fstat)(FsContext *, int, V9fsFidOpenState *, struct stat *);
 141    int (*rename)(FsContext *, const char *, const char *);
 142    int (*truncate)(FsContext *, V9fsPath *, off_t);
 143    int (*fsync)(FsContext *, int, V9fsFidOpenState *, int);
 144    int (*statfs)(FsContext *s, V9fsPath *path, struct statfs *stbuf);
 145    ssize_t (*lgetxattr)(FsContext *, V9fsPath *,
 146                         const char *, void *, size_t);
 147    ssize_t (*llistxattr)(FsContext *, V9fsPath *, void *, size_t);
 148    int (*lsetxattr)(FsContext *, V9fsPath *,
 149                     const char *, void *, size_t, int);
 150    int (*lremovexattr)(FsContext *, V9fsPath *, const char *);
 151    int (*name_to_path)(FsContext *, V9fsPath *, const char *, V9fsPath *);
 152    int (*renameat)(FsContext *ctx, V9fsPath *olddir, const char *old_name,
 153                    V9fsPath *newdir, const char *new_name);
 154    int (*unlinkat)(FsContext *ctx, V9fsPath *dir, const char *name, int flags);
 155};
 156
 157#endif
 158