Block driver "raw" forwards most methods to the underlying block driver. However, it doesn't implement method bdrv_media_changed(). Makes bdrv_media_changed() always return -ENOTSUP. I believe -fda /dev/fd0 gives you raw over host_floppy, and disk change detection (fdc register 7 bit 7) is broken. Testing my theory requires a computer museum, though. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
163 lines
4 KiB
C
163 lines
4 KiB
C
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#include "qemu-common.h"
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#include "block_int.h"
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#include "module.h"
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static int raw_open(BlockDriverState *bs, int flags)
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{
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bs->sg = bs->file->sg;
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return 0;
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}
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static int raw_read(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors)
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{
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return bdrv_read(bs->file, sector_num, buf, nb_sectors);
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}
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static int raw_write(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors)
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{
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return bdrv_write(bs->file, sector_num, buf, nb_sectors);
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}
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static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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return bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
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}
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static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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return bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors, cb, opaque);
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}
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static void raw_close(BlockDriverState *bs)
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{
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}
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static int raw_flush(BlockDriverState *bs)
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{
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return bdrv_flush(bs->file);
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}
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static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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return bdrv_aio_flush(bs->file, cb, opaque);
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}
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static int64_t raw_getlength(BlockDriverState *bs)
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{
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return bdrv_getlength(bs->file);
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}
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static int raw_truncate(BlockDriverState *bs, int64_t offset)
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{
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return bdrv_truncate(bs->file, offset);
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}
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static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
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{
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return 1; /* everything can be opened as raw image */
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}
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static int raw_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
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{
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return bdrv_discard(bs->file, sector_num, nb_sectors);
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}
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static int raw_is_inserted(BlockDriverState *bs)
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{
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return bdrv_is_inserted(bs->file);
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}
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static int raw_media_changed(BlockDriverState *bs)
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{
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return bdrv_media_changed(bs->file);
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}
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static void raw_eject(BlockDriverState *bs, int eject_flag)
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{
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bdrv_eject(bs->file, eject_flag);
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}
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static void raw_set_locked(BlockDriverState *bs, int locked)
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{
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bdrv_set_locked(bs->file, locked);
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}
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static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
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{
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return bdrv_ioctl(bs->file, req, buf);
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}
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static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
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unsigned long int req, void *buf,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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return bdrv_aio_ioctl(bs->file, req, buf, cb, opaque);
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}
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static int raw_create(const char *filename, QEMUOptionParameter *options)
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{
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return bdrv_create_file(filename, options);
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}
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static QEMUOptionParameter raw_create_options[] = {
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{
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.name = BLOCK_OPT_SIZE,
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.type = OPT_SIZE,
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.help = "Virtual disk size"
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},
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{ NULL }
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};
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static int raw_has_zero_init(BlockDriverState *bs)
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{
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return bdrv_has_zero_init(bs->file);
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}
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static BlockDriver bdrv_raw = {
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.format_name = "raw",
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/* It's really 0, but we need to make g_malloc() happy */
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.instance_size = 1,
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.bdrv_open = raw_open,
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.bdrv_close = raw_close,
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.bdrv_read = raw_read,
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.bdrv_write = raw_write,
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.bdrv_flush = raw_flush,
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.bdrv_probe = raw_probe,
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.bdrv_getlength = raw_getlength,
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.bdrv_truncate = raw_truncate,
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.bdrv_aio_readv = raw_aio_readv,
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.bdrv_aio_writev = raw_aio_writev,
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.bdrv_aio_flush = raw_aio_flush,
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.bdrv_discard = raw_discard,
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.bdrv_is_inserted = raw_is_inserted,
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.bdrv_media_changed = raw_media_changed,
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.bdrv_eject = raw_eject,
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.bdrv_set_locked = raw_set_locked,
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.bdrv_ioctl = raw_ioctl,
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.bdrv_aio_ioctl = raw_aio_ioctl,
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.bdrv_create = raw_create,
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.create_options = raw_create_options,
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.bdrv_has_zero_init = raw_has_zero_init,
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};
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static void bdrv_raw_init(void)
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{
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bdrv_register(&bdrv_raw);
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}
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block_init(bdrv_raw_init);
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