block/raw.c

   1
   2 #include "qemu-common.h"
   3 #include "block/block_int.h"
   4 #include "qemu/module.h"
   5
   6 static int raw_open(BlockDriverState *bs, QDict *options, int flags)
   7 {
   8     bs->sg = bs->file->sg;
   9     return 0;
  10 }
  11
  12 /* We have nothing to do for raw reopen, stubs just return
  13  * success */
  14 static int raw_reopen_prepare(BDRVReopenState *state,
  15                               BlockReopenQueue *queue,  Error **errp)
  16 {
  17     return 0;
  18 }
  19
  20 static int coroutine_fn raw_co_readv(BlockDriverState *bs, int64_t sector_num,
  21                                      int nb_sectors, QEMUIOVector *qiov)
  22 {
  23     BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
  24     return bdrv_co_readv(bs->file, sector_num, nb_sectors, qiov);
  25 }
  26
  27 static int coroutine_fn raw_co_writev(BlockDriverState *bs, int64_t sector_num,
  28                                       int nb_sectors, QEMUIOVector *qiov)
  29 {
  30     BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
  31     return bdrv_co_writev(bs->file, sector_num, nb_sectors, qiov);
  32 }
  33
  34 static void raw_close(BlockDriverState *bs)
  35 {
  36 }
  37
  38 static int coroutine_fn raw_co_is_allocated(BlockDriverState *bs,
  39                                             int64_t sector_num,
  40                                             int nb_sectors, int *pnum)
  41 {
  42     return bdrv_co_is_allocated(bs->file, sector_num, nb_sectors, pnum);
  43 }
  44
  45 static int64_t raw_getlength(BlockDriverState *bs)
  46 {
  47     return bdrv_getlength(bs->file);
  48 }
  49
  50 static int raw_truncate(BlockDriverState *bs, int64_t offset)
  51 {
  52     return bdrv_truncate(bs->file, offset);
  53 }
  54
  55 static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
  56 {
  57    return 1; /* everything can be opened as raw image */
  58 }
  59
  60 static int coroutine_fn raw_co_discard(BlockDriverState *bs,
  61                                        int64_t sector_num, int nb_sectors)
  62 {
  63     return bdrv_co_discard(bs->file, sector_num, nb_sectors);
  64 }
  65
  66 static int raw_is_inserted(BlockDriverState *bs)
  67 {
  68     return bdrv_is_inserted(bs->file);
  69 }
  70
  71 static int raw_media_changed(BlockDriverState *bs)
  72 {
  73     return bdrv_media_changed(bs->file);
  74 }
  75
  76 static void raw_eject(BlockDriverState *bs, bool eject_flag)
  77 {
  78     bdrv_eject(bs->file, eject_flag);
  79 }
  80
  81 static void raw_lock_medium(BlockDriverState *bs, bool locked)
  82 {
  83     bdrv_lock_medium(bs->file, locked);
  84 }
  85
  86 static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
  87 {
  88    return bdrv_ioctl(bs->file, req, buf);
  89 }
  90
  91 static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
  92         unsigned long int req, void *buf,
  93         BlockDriverCompletionFunc *cb, void *opaque)
  94 {
  95    return bdrv_aio_ioctl(bs->file, req, buf, cb, opaque);
  96 }
  97
  98 static int raw_create(const char *filename, QEMUOptionParameter *options)
  99 {
 100     return bdrv_create_file(filename, options);
 101 }
 102
 103 static QEMUOptionParameter raw_create_options[] = {
 104     {
 105         .name = BLOCK_OPT_SIZE,
 106         .type = OPT_SIZE,
 107         .help = "Virtual disk size"
 108     },
 109     { NULL }
 110 };
 111
 112 static int raw_has_zero_init(BlockDriverState *bs)
 113 {
 114     return bdrv_has_zero_init(bs->file);
 115 }
 116
 117 static BlockDriver bdrv_raw = {
 118     .format_name        = "raw",
 119
 120     /* It's really 0, but we need to make g_malloc() happy */
 121     .instance_size      = 1,
 122
 123     .bdrv_open          = raw_open,
 124     .bdrv_close         = raw_close,
 125
 126     .bdrv_reopen_prepare  = raw_reopen_prepare,
 127
 128     .bdrv_co_readv          = raw_co_readv,
 129     .bdrv_co_writev         = raw_co_writev,
 130     .bdrv_co_is_allocated   = raw_co_is_allocated,
 131     .bdrv_co_discard        = raw_co_discard,
 132
 133     .bdrv_probe         = raw_probe,
 134     .bdrv_getlength     = raw_getlength,
 135     .bdrv_truncate      = raw_truncate,
 136
 137     .bdrv_is_inserted   = raw_is_inserted,
 138     .bdrv_media_changed = raw_media_changed,
 139     .bdrv_eject         = raw_eject,
 140     .bdrv_lock_medium   = raw_lock_medium,
 141
 142     .bdrv_ioctl         = raw_ioctl,
 143     .bdrv_aio_ioctl     = raw_aio_ioctl,
 144
 145     .bdrv_create        = raw_create,
 146     .create_options     = raw_create_options,
 147     .bdrv_has_zero_init = raw_has_zero_init,
 148 };
 149
 150 static void bdrv_raw_init(void)
 151 {
 152     bdrv_register(&bdrv_raw);
 153 }
 154
 155 block_init(bdrv_raw_init);