block/raw.c

   1 /*
   2  * Block driver for RAW format
   3  *
   4  * Copyright (c) 2006 Fabrice Bellard
   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 deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * 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
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "qemu-common.h"
  26 #include "block/block_int.h"
  27 #include "qemu/module.h"
  28
  29 static int raw_open(BlockDriverState *bs, QDict *options, int flags)
  30 {
  31     bs->sg = bs->file->sg;
  32     return 0;
  33 }
  34
  35 /* We have nothing to do for raw reopen, stubs just return
  36  * success */
  37 static int raw_reopen_prepare(BDRVReopenState *state,
  38                               BlockReopenQueue *queue,  Error **errp)
  39 {
  40     return 0;
  41 }
  42
  43 static int coroutine_fn raw_co_readv(BlockDriverState *bs, int64_t sector_num,
  44                                      int nb_sectors, QEMUIOVector *qiov)
  45 {
  46     BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
  47     return bdrv_co_readv(bs->file, sector_num, nb_sectors, qiov);
  48 }
  49
  50 static int coroutine_fn raw_co_writev(BlockDriverState *bs, int64_t sector_num,
  51                                       int nb_sectors, QEMUIOVector *qiov)
  52 {
  53     BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
  54     return bdrv_co_writev(bs->file, sector_num, nb_sectors, qiov);
  55 }
  56
  57 static void raw_close(BlockDriverState *bs)
  58 {
  59 }
  60
  61 static int coroutine_fn raw_co_is_allocated(BlockDriverState *bs,
  62                                             int64_t sector_num,
  63                                             int nb_sectors, int *pnum)
  64 {
  65     return bdrv_co_is_allocated(bs->file, sector_num, nb_sectors, pnum);
  66 }
  67
  68 static int coroutine_fn raw_co_write_zeroes(BlockDriverState *bs,
  69                                             int64_t sector_num,
  70                                             int nb_sectors)
  71 {
  72     return bdrv_co_write_zeroes(bs->file, sector_num, nb_sectors);
  73 }
  74
  75 static int64_t raw_getlength(BlockDriverState *bs)
  76 {
  77     return bdrv_getlength(bs->file);
  78 }
  79
  80 static int raw_truncate(BlockDriverState *bs, int64_t offset)
  81 {
  82     return bdrv_truncate(bs->file, offset);
  83 }
  84
  85 static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
  86 {
  87    return 1; /* everything can be opened as raw image */
  88 }
  89
  90 static int coroutine_fn raw_co_discard(BlockDriverState *bs,
  91                                        int64_t sector_num, int nb_sectors)
  92 {
  93     return bdrv_co_discard(bs->file, sector_num, nb_sectors);
  94 }
  95
  96 static int raw_is_inserted(BlockDriverState *bs)
  97 {
  98     return bdrv_is_inserted(bs->file);
  99 }
 100
 101 static int raw_media_changed(BlockDriverState *bs)
 102 {
 103     return bdrv_media_changed(bs->file);
 104 }
 105
 106 static void raw_eject(BlockDriverState *bs, bool eject_flag)
 107 {
 108     bdrv_eject(bs->file, eject_flag);
 109 }
 110
 111 static void raw_lock_medium(BlockDriverState *bs, bool locked)
 112 {
 113     bdrv_lock_medium(bs->file, locked);
 114 }
 115
 116 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
 117 {
 118    return bdrv_ioctl(bs->file, req, buf);
 119 }
 120
 121 static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
 122         unsigned long int req, void *buf,
 123         BlockDriverCompletionFunc *cb, void *opaque)
 124 {
 125    return bdrv_aio_ioctl(bs->file, req, buf, cb, opaque);
 126 }
 127
 128 static int raw_create(const char *filename, QEMUOptionParameter *options)
 129 {
 130     return bdrv_create_file(filename, options);
 131 }
 132
 133 static QEMUOptionParameter raw_create_options[] = {
 134     {
 135         .name = BLOCK_OPT_SIZE,
 136         .type = OPT_SIZE,
 137         .help = "Virtual disk size"
 138     },
 139     { NULL }
 140 };
 141
 142 static int raw_has_zero_init(BlockDriverState *bs)
 143 {
 144     return bdrv_has_zero_init(bs->file);
 145 }
 146
 147 static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
 148 {
 149     return bdrv_get_info(bs->file, bdi);
 150 }
 151
 152 static BlockDriver bdrv_raw = {
 153     .format_name        = "raw",
 154
 155     /* It's really 0, but we need to make g_malloc() happy */
 156     .instance_size      = 1,
 157
 158     .bdrv_open          = raw_open,
 159     .bdrv_close         = raw_close,
 160
 161     .bdrv_reopen_prepare  = raw_reopen_prepare,
 162
 163     .bdrv_co_readv          = raw_co_readv,
 164     .bdrv_co_writev         = raw_co_writev,
 165     .bdrv_co_is_allocated   = raw_co_is_allocated,
 166     .bdrv_co_write_zeroes   = raw_co_write_zeroes,
 167     .bdrv_co_discard        = raw_co_discard,
 168
 169     .bdrv_probe         = raw_probe,
 170     .bdrv_getlength     = raw_getlength,
 171     .bdrv_get_info      = raw_get_info,
 172     .bdrv_truncate      = raw_truncate,
 173
 174     .bdrv_is_inserted   = raw_is_inserted,
 175     .bdrv_media_changed = raw_media_changed,
 176     .bdrv_eject         = raw_eject,
 177     .bdrv_lock_medium   = raw_lock_medium,
 178
 179     .bdrv_ioctl         = raw_ioctl,
 180     .bdrv_aio_ioctl     = raw_aio_ioctl,
 181
 182     .bdrv_create        = raw_create,
 183     .create_options     = raw_create_options,
 184     .bdrv_has_zero_init = raw_has_zero_init,
 185 };
 186
 187 static void bdrv_raw_init(void)
 188 {
 189     bdrv_register(&bdrv_raw);
 190 }
 191
 192 block_init(bdrv_raw_init);