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
  23 typedef 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
  31 struct xattr_operations;
  32 struct FsContext;
  33 struct V9fsPath;
  34
  35 typedef 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
  67 typedef struct FileOperations FileOperations;
  68 /*
  69  * Structure to store the various fsdev's passed through command line.
  70  */
  71 typedef struct FsDriverEntry {
  72     char *fsdev_id;
  73     char *path;
  74     int export_flags;
  75     FileOperations *ops;
  76 } FsDriverEntry;
  77
  78 typedef 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
  89 typedef struct V9fsPath {
  90     uint16_t size;
  91     char *data;
  92 } V9fsPath;
  93
  94 typedef union V9fsFidOpenState V9fsFidOpenState;
  95
  96 void cred_init(FsCred *);
  97
  98 struct 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