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