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 QEMUOptionParameter raw_create_options[] = {
  33     {
  34         .name = BLOCK_OPT_SIZE,
  35         .type = OPT_SIZE,
  36         .help = "Virtual disk size"
  37     },
  38     { 0 }
  39 };
  40
  41 static int raw_reopen_prepare(BDRVReopenState *reopen_state,
  42                               BlockReopenQueue *queue, Error **errp)
  43 {
  44     return 0;
  45 }
  46
  47 static int coroutine_fn raw_co_readv(BlockDriverState *bs, int64_t sector_num,
  48                                      int nb_sectors, QEMUIOVector *qiov)
  49 {
  50     BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
  51     return bdrv_co_readv(bs->file, sector_num, nb_sectors, qiov);
  52 }
  53
  54 static int coroutine_fn raw_co_writev(BlockDriverState *bs, int64_t sector_num,
  55                                       int nb_sectors, QEMUIOVector *qiov)
  56 {
  57     BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
  58     return bdrv_co_writev(bs->file, sector_num, nb_sectors, qiov);
  59 }
  60
  61 static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
  62                                             int64_t sector_num,
  63                                             int nb_sectors, int *pnum)
  64 {
  65     *pnum = nb_sectors;
  66     return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA |
  67            (sector_num << BDRV_SECTOR_BITS);
  68 }
  69
  70 static int coroutine_fn raw_co_write_zeroes(BlockDriverState *bs,
  71                                             int64_t sector_num, int nb_sectors,
  72                                             BdrvRequestFlags flags)
  73 {
  74     return bdrv_co_write_zeroes(bs->file, sector_num, nb_sectors, flags);
  75 }
  76
  77 static int coroutine_fn raw_co_discard(BlockDriverState *bs,
  78                                        int64_t sector_num, int nb_sectors)
  79 {
  80     return bdrv_co_discard(bs->file, sector_num, nb_sectors);
  81 }
  82
  83 static int64_t raw_getlength(BlockDriverState *bs)
  84 {
  85     return bdrv_getlength(bs->file);
  86 }
  87
  88 static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
  89 {
  90     return bdrv_get_info(bs->file, bdi);
  91 }
  92
  93 static int raw_refresh_limits(BlockDriverState *bs)
  94 {
  95     bs->bl = bs->file->bl;
  96     return 0;
  97 }
  98
  99 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 100 {
 101     return bdrv_truncate(bs->file, offset);
 102 }
 103
 104 static int raw_is_inserted(BlockDriverState *bs)
 105 {
 106     return bdrv_is_inserted(bs->file);
 107 }
 108
 109 static int raw_media_changed(BlockDriverState *bs)
 110 {
 111     return bdrv_media_changed(bs->file);
 112 }
 113
 114 static void raw_eject(BlockDriverState *bs, bool eject_flag)
 115 {
 116     bdrv_eject(bs->file, eject_flag);
 117 }
 118
 119 static void raw_lock_medium(BlockDriverState *bs, bool locked)
 120 {
 121     bdrv_lock_medium(bs->file, locked);
 122 }
 123
 124 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
 125 {
 126     return bdrv_ioctl(bs->file, req, buf);
 127 }
 128
 129 static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
 130                                        unsigned long int req, void *buf,
 131                                        BlockDriverCompletionFunc *cb,
 132                                        void *opaque)
 133 {
 134     return bdrv_aio_ioctl(bs->file, req, buf, cb, opaque);
 135 }
 136
 137 static int raw_has_zero_init(BlockDriverState *bs)
 138 {
 139     return bdrv_has_zero_init(bs->file);
 140 }
 141
 142 static int raw_create(const char *filename, QEMUOptionParameter *options,
 143                       Error **errp)
 144 {
 145     Error *local_err = NULL;
 146     int ret;
 147
 148     ret = bdrv_create_file(filename, options, &local_err);
 149     if (local_err) {
 150         error_propagate(errp, local_err);
 151     }
 152     return ret;
 153 }
 154
 155 static int raw_open(BlockDriverState *bs, QDict *options, int flags,
 156                     Error **errp)
 157 {
 158     bs->sg = bs->file->sg;
 159     return 0;
 160 }
 161
 162 static void raw_close(BlockDriverState *bs)
 163 {
 164 }
 165
 166 static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
 167 {
 168     /* smallest possible positive score so that raw is used if and only if no
 169      * other block driver works
 170      */
 171     return 1;
 172 }
 173
 174 static BlockDriver bdrv_raw = {
 175     .format_name          = "raw",
 176     .bdrv_probe           = &raw_probe,
 177     .bdrv_reopen_prepare  = &raw_reopen_prepare,
 178     .bdrv_open            = &raw_open,
 179     .bdrv_close           = &raw_close,
 180     .bdrv_create          = &raw_create,
 181     .bdrv_co_readv        = &raw_co_readv,
 182     .bdrv_co_writev       = &raw_co_writev,
 183     .bdrv_co_write_zeroes = &raw_co_write_zeroes,
 184     .bdrv_co_discard      = &raw_co_discard,
 185     .bdrv_co_get_block_status = &raw_co_get_block_status,
 186     .bdrv_truncate        = &raw_truncate,
 187     .bdrv_getlength       = &raw_getlength,
 188     .has_variable_length  = true,
 189     .bdrv_get_info        = &raw_get_info,
 190     .bdrv_refresh_limits  = &raw_refresh_limits,
 191     .bdrv_is_inserted     = &raw_is_inserted,
 192     .bdrv_media_changed   = &raw_media_changed,
 193     .bdrv_eject           = &raw_eject,
 194     .bdrv_lock_medium     = &raw_lock_medium,
 195     .bdrv_ioctl           = &raw_ioctl,
 196     .bdrv_aio_ioctl       = &raw_aio_ioctl,
 197     .create_options       = &raw_create_options[0],
 198     .bdrv_has_zero_init   = &raw_has_zero_init
 199 };
 200
 201 static void bdrv_raw_init(void)
 202 {
 203     bdrv_register(&bdrv_raw);
 204 }
 205
 206 block_init(bdrv_raw_init);