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
  26 typedef 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
  34 struct xattr_operations;
  35 struct FsContext;
  36 struct V9fsPath;
  37
  38 typedef 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
  70 typedef struct FileOperations FileOperations;
  71 /*
  72  * Structure to store the various fsdev's passed through command line.
  73  */
  74 typedef struct FsDriverEntry {
  75     char *fsdev_id;
  76     char *path;
  77     int export_flags;
  78     FileOperations *ops;
  79 } FsDriverEntry;
  80
  81 typedef 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
  92 typedef struct V9fsPath {
  93     uint16_t size;
  94     char *data;
  95 } V9fsPath;
  96
  97 typedef union V9fsFidOpenState V9fsFidOpenState;
  98
  99 void cred_init(FsCred *);
 100
 101 struct 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