sys/arch/xen/include/xen3-public/io/fsif.h

   1 /******************************************************************************
   2  * fsif.h
   3  *
   4  * Interface to FS level split device drivers.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to
   8  * deal in the Software without restriction, including without limitation the
   9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  10  * sell copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Copyright (c) 2007, Grzegorz Milos, <gm281@cam.ac.uk>.
  25  */
  26
  27 #ifndef __XEN_PUBLIC_IO_FSIF_H__
  28 #define __XEN_PUBLIC_IO_FSIF_H__
  29
  30 #include "ring.h"
  31 #include "../grant_table.h"
  32
  33 #define REQ_FILE_OPEN        1
  34 #define REQ_FILE_CLOSE       2
  35 #define REQ_FILE_READ        3
  36 #define REQ_FILE_WRITE       4
  37 #define REQ_STAT             5
  38 #define REQ_FILE_TRUNCATE    6
  39 #define REQ_REMOVE           7
  40 #define REQ_RENAME           8
  41 #define REQ_CREATE           9
  42 #define REQ_DIR_LIST        10
  43 #define REQ_CHMOD           11
  44 #define REQ_FS_SPACE        12
  45 #define REQ_FILE_SYNC       13
  46
  47 struct fsif_open_request {
  48     grant_ref_t gref;
  49 };
  50
  51 struct fsif_close_request {
  52     uint32_t fd;
  53 };
  54
  55 struct fsif_read_request {
  56     uint32_t fd;
  57     int32_t pad;
  58     uint64_t len;
  59     uint64_t offset;
  60     grant_ref_t grefs[1];  /* Variable length */
  61 };
  62
  63 struct fsif_write_request {
  64     uint32_t fd;
  65     int32_t pad;
  66     uint64_t len;
  67     uint64_t offset;
  68     grant_ref_t grefs[1];  /* Variable length */
  69 };
  70
  71 struct fsif_stat_request {
  72     uint32_t fd;
  73 };
  74
  75 /* This structure is a copy of some fields from stat structure, returned
  76  * via the ring. */
  77 struct fsif_stat_response {
  78     int32_t  stat_mode;
  79     uint32_t stat_uid;
  80     uint32_t stat_gid;
  81     int32_t  stat_ret;
  82     int64_t  stat_size;
  83     int64_t  stat_atime;
  84     int64_t  stat_mtime;
  85     int64_t  stat_ctime;
  86 };
  87
  88 struct fsif_truncate_request {
  89     uint32_t fd;
  90     int32_t pad;
  91     int64_t length;
  92 };
  93
  94 struct fsif_remove_request {
  95     grant_ref_t gref;
  96 };
  97
  98 struct fsif_rename_request {
  99     uint16_t old_name_offset;
 100     uint16_t new_name_offset;
 101     grant_ref_t gref;
 102 };
 103
 104 struct fsif_create_request {
 105     int8_t directory;
 106     int8_t pad;
 107     int16_t pad2;
 108     int32_t mode;
 109     grant_ref_t gref;
 110 };
 111
 112 struct fsif_list_request {
 113     uint32_t offset;
 114     grant_ref_t gref;
 115 };
 116
 117 #define NR_FILES_SHIFT  0
 118 #define NR_FILES_SIZE   16   /* 16 bits for the number of files mask */
 119 #define NR_FILES_MASK   (((1ULL << NR_FILES_SIZE) - 1) << NR_FILES_SHIFT)
 120 #define ERROR_SIZE      32   /* 32 bits for the error mask */
 121 #define ERROR_SHIFT     (NR_FILES_SIZE + NR_FILES_SHIFT)
 122 #define ERROR_MASK      (((1ULL << ERROR_SIZE) - 1) << ERROR_SHIFT)
 123 #define HAS_MORE_SHIFT  (ERROR_SHIFT + ERROR_SIZE)
 124 #define HAS_MORE_FLAG   (1ULL << HAS_MORE_SHIFT)
 125
 126 struct fsif_chmod_request {
 127     uint32_t fd;
 128     int32_t mode;
 129 };
 130
 131 struct fsif_space_request {
 132     grant_ref_t gref;
 133 };
 134
 135 struct fsif_sync_request {
 136     uint32_t fd;
 137 };
 138
 139
 140 /* FS operation request */
 141 struct fsif_request {
 142     uint8_t type;                 /* Type of the request                  */
 143     uint8_t pad;
 144     uint16_t id;                  /* Request ID, copied to the response   */
 145     uint32_t pad2;
 146     union {
 147         struct fsif_open_request     fopen;
 148         struct fsif_close_request    fclose;
 149         struct fsif_read_request     fread;
 150         struct fsif_write_request    fwrite;
 151         struct fsif_stat_request     fstat;
 152         struct fsif_truncate_request ftruncate;
 153         struct fsif_remove_request   fremove;
 154         struct fsif_rename_request   frename;
 155         struct fsif_create_request   fcreate;
 156         struct fsif_list_request     flist;
 157         struct fsif_chmod_request    fchmod;
 158         struct fsif_space_request    fspace;
 159         struct fsif_sync_request     fsync;
 160     } u;
 161 };
 162 typedef struct fsif_request fsif_request_t;
 163
 164 /* FS operation response */
 165 struct fsif_response {
 166     uint16_t id;
 167     uint16_t pad1;
 168     uint32_t pad2;
 169     union {
 170         uint64_t ret_val;
 171         struct fsif_stat_response fstat;
 172     };
 173 };
 174
 175 typedef struct fsif_response fsif_response_t;
 176
 177 #define FSIF_RING_ENTRY_SIZE   64
 178
 179 #define FSIF_NR_READ_GNTS  ((FSIF_RING_ENTRY_SIZE - sizeof(struct fsif_read_request)) /  \
 180                                 sizeof(grant_ref_t) + 1)
 181 #define FSIF_NR_WRITE_GNTS ((FSIF_RING_ENTRY_SIZE - sizeof(struct fsif_write_request)) / \
 182                                 sizeof(grant_ref_t) + 1)
 183
 184 DEFINE_RING_TYPES(fsif, struct fsif_request, struct fsif_response);
 185
 186 #define STATE_INITIALISED     "init"
 187 #define STATE_READY           "ready"
 188
 189
 190
 191 #endif