block/raw_bsd.c

   1 /* BlockDriver implementation for "raw"
   2  *
   3  * Copyright (C) 2010, 2013, Red Hat, Inc.
   4  * Copyright (C) 2010, Blue Swirl <blauwirbel@gmail.com>
   5  * Copyright (C) 2009, Anthony Liguori <aliguori@us.ibm.com>
   6  *
   7  * Author:
   8  *   Laszlo Ersek <lersek@redhat.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to
  12  * deal in the Software without restriction, including without limitation the
  13  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  14  * sell copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  25  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  26  * IN THE SOFTWARE.
  27  */
  28
  29 #include "block/block_int.h"
  30 #include "qemu/option.h"
  31
  32 static QemuOptsList raw_create_opts = {
  33     .name = "raw-create-opts",
  34     .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
  35     .desc = {
  36         {
  37             .name = BLOCK_OPT_SIZE,
  38             .type = QEMU_OPT_SIZE,
  39             .help = "Virtual disk size"
  40         },
  41         { /* end of list */ }
  42     }
  43 };
  44
  45 static int raw_reopen_prepare(BDRVReopenState *reopen_state,
  46                               BlockReopenQueue *queue, Error **errp)
  47 {
  48     return 0;
  49 }
  50
  51 static int coroutine_fn raw_co_readv(BlockDriverState *bs, int64_t sector_num,
  52                                      int nb_sectors, QEMUIOVector *qiov)
  53 {
  54     BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
  55     return bdrv_co_readv(bs->file, sector_num, nb_sectors, qiov);
  56 }
  57
  58 static int coroutine_fn raw_co_writev(BlockDriverState *bs, int64_t sector_num,
  59                                       int nb_sectors, QEMUIOVector *qiov)
  60 {
  61     BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
  62     return bdrv_co_writev(bs->file, sector_num, nb_sectors, qiov);
  63 }
  64
  65 static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
  66                                             int64_t sector_num,
  67                                             int nb_sectors, int *pnum)
  68 {
  69     *pnum = nb_sectors;
  70     return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA |
  71            (sector_num << BDRV_SECTOR_BITS);
  72 }
  73
  74 static int coroutine_fn raw_co_write_zeroes(BlockDriverState *bs,
  75                                             int64_t sector_num, int nb_sectors,
  76                                             BdrvRequestFlags flags)
  77 {
  78     return bdrv_co_write_zeroes(bs->file, sector_num, nb_sectors, flags);
  79 }
  80
  81 static int coroutine_fn raw_co_discard(BlockDriverState *bs,
  82                                        int64_t sector_num, int nb_sectors)
  83 {
  84     return bdrv_co_discard(bs->file, sector_num, nb_sectors);
  85 }
  86
  87 static int64_t raw_getlength(BlockDriverState *bs)
  88 {
  89     return bdrv_getlength(bs->file);
  90 }
  91
  92 static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
  93 {
  94     return bdrv_get_info(bs->file, bdi);
  95 }
  96
  97 static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
  98 {
  99     bs->bl = bs->file->bl;
 100 }
 101
 102 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 103 {
 104     return bdrv_truncate(bs->file, offset);
 105 }
 106
 107 static int raw_is_inserted(BlockDriverState *bs)
 108 {
 109     return bdrv_is_inserted(bs->file);
 110 }
 111
 112 static int raw_media_changed(BlockDriverState *bs)
 113 {
 114     return bdrv_media_changed(bs->file);
 115 }
 116
 117 static void raw_eject(BlockDriverState *bs, bool eject_flag)
 118 {
 119     bdrv_eject(bs->file, eject_flag);
 120 }
 121
 122 static void raw_lock_medium(BlockDriverState *bs, bool locked)
 123 {
 124     bdrv_lock_medium(bs->file, locked);
 125 }
 126
 127 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
 128 {
 129     return bdrv_ioctl(bs->file, req, buf);
 130 }
 131
 132 static BlockAIOCB *raw_aio_ioctl(BlockDriverState *bs,
 133                                  unsigned long int req, void *buf,
 134                                  BlockCompletionFunc *cb,
 135                                  void *opaque)
 136 {
 137     return bdrv_aio_ioctl(bs->file, req, buf, cb, opaque);
 138 }
 139
 140 static int raw_has_zero_init(BlockDriverState *bs)
 141 {
 142     return bdrv_has_zero_init(bs->file);
 143 }
 144
 145 static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
 146 {
 147     Error *local_err = NULL;
 148     int ret;
 149
 150     ret = bdrv_create_file(filename, opts, &local_err);
 151     if (local_err) {
 152         error_propagate(errp, local_err);
 153     }
 154     return ret;
 155 }
 156
 157 static int raw_open(BlockDriverState *bs, QDict *options, int flags,
 158                     Error **errp)
 159 {
 160     bs->sg = bs->file->sg;
 161     return 0;
 162 }
 163
 164 static void raw_close(BlockDriverState *bs)
 165 {
 166 }
 167
 168 static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
 169 {
 170     /* smallest possible positive score so that raw is used if and only if no
 171      * other block driver works
 172      */
 173     return 1;
 174 }
 175
 176 static BlockDriver bdrv_raw = {
 177     .format_name          = "raw",
 178     .bdrv_probe           = &raw_probe,
 179     .bdrv_reopen_prepare  = &raw_reopen_prepare,
 180     .bdrv_open            = &raw_open,
 181     .bdrv_close           = &raw_close,
 182     .bdrv_create          = &raw_create,
 183     .bdrv_co_readv        = &raw_co_readv,
 184     .bdrv_co_writev       = &raw_co_writev,
 185     .bdrv_co_write_zeroes = &raw_co_write_zeroes,
 186     .bdrv_co_discard      = &raw_co_discard,
 187     .bdrv_co_get_block_status = &raw_co_get_block_status,
 188     .bdrv_truncate        = &raw_truncate,
 189     .bdrv_getlength       = &raw_getlength,
 190     .has_variable_length  = true,
 191     .bdrv_get_info        = &raw_get_info,
 192     .bdrv_refresh_limits  = &raw_refresh_limits,
 193     .bdrv_is_inserted     = &raw_is_inserted,
 194     .bdrv_media_changed   = &raw_media_changed,
 195     .bdrv_eject           = &raw_eject,
 196     .bdrv_lock_medium     = &raw_lock_medium,
 197     .bdrv_ioctl           = &raw_ioctl,
 198     .bdrv_aio_ioctl       = &raw_aio_ioctl,
 199     .create_opts          = &raw_create_opts,
 200     .bdrv_has_zero_init   = &raw_has_zero_init
 201 };
 202
 203 static void bdrv_raw_init(void)
 204 {
 205     bdrv_register(&bdrv_raw);
 206 }
 207
 208 block_init(bdrv_raw_init);