/* BlockDriver implementation for "raw"
*
- * Copyright (C) 2010, 2013, Red Hat, Inc.
+ * Copyright (C) 2010-2016 Red Hat, Inc.
*
* IN THE SOFTWARE.
*/
+#include "qemu/osdep.h"
#include "block/block_int.h"
+#include "qapi/error.h"
#include "qemu/option.h"
static QemuOptsList raw_create_opts = {
return 0;
}
-static int coroutine_fn raw_co_readv(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, QEMUIOVector *qiov)
+static int coroutine_fn raw_co_preadv(BlockDriverState *bs, uint64_t offset,
+ uint64_t bytes, QEMUIOVector *qiov,
+ int flags)
{
BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
- return bdrv_co_readv(bs->file, sector_num, nb_sectors, qiov);
+ return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
}
-static int coroutine_fn raw_co_writev(BlockDriverState *bs, int64_t sector_num,
- int nb_sectors, QEMUIOVector *qiov)
+static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, uint64_t offset,
+ uint64_t bytes, QEMUIOVector *qiov,
+ int flags)
{
+ void *buf = NULL;
+ BlockDriver *drv;
+ QEMUIOVector local_qiov;
+ int ret;
+
+ if (bs->probed && offset < BLOCK_PROBE_BUF_SIZE && bytes) {
+ /* Handling partial writes would be a pain - so we just
+ * require that guests have 512-byte request alignment if
+ * probing occurred */
+ QEMU_BUILD_BUG_ON(BLOCK_PROBE_BUF_SIZE != 512);
+ QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != 512);
+ assert(offset == 0 && bytes >= BLOCK_PROBE_BUF_SIZE);
+
+ buf = qemu_try_blockalign(bs->file->bs, 512);
+ if (!buf) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ ret = qemu_iovec_to_buf(qiov, 0, buf, 512);
+ if (ret != 512) {
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ drv = bdrv_probe_all(buf, 512, NULL);
+ if (drv != bs->drv) {
+ ret = -EPERM;
+ goto fail;
+ }
+
+ /* Use the checked buffer, a malicious guest might be overwriting its
+ * original buffer in the background. */
+ qemu_iovec_init(&local_qiov, qiov->niov + 1);
+ qemu_iovec_add(&local_qiov, buf, 512);
+ qemu_iovec_concat(&local_qiov, qiov, 512, qiov->size - 512);
+ qiov = &local_qiov;
+ }
+
BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
- return bdrv_co_writev(bs->file, sector_num, nb_sectors, qiov);
+ ret = bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
+
+fail:
+ if (qiov == &local_qiov) {
+ qemu_iovec_destroy(&local_qiov);
+ }
+ qemu_vfree(buf);
+ return ret;
}
static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
int64_t sector_num,
- int nb_sectors, int *pnum)
+ int nb_sectors, int *pnum,
+ BlockDriverState **file)
{
*pnum = nb_sectors;
+ *file = bs->file->bs;
return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA |
(sector_num << BDRV_SECTOR_BITS);
}
-static int coroutine_fn raw_co_write_zeroes(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors,
- BdrvRequestFlags flags)
+static int coroutine_fn raw_co_pwrite_zeroes(BlockDriverState *bs,
+ int64_t offset, int count,
+ BdrvRequestFlags flags)
{
- return bdrv_co_write_zeroes(bs->file, sector_num, nb_sectors, flags);
+ return bdrv_co_pwrite_zeroes(bs->file, offset, count, flags);
}
-static int coroutine_fn raw_co_discard(BlockDriverState *bs,
- int64_t sector_num, int nb_sectors)
+static int coroutine_fn raw_co_pdiscard(BlockDriverState *bs,
+ int64_t offset, int count)
{
- return bdrv_co_discard(bs->file, sector_num, nb_sectors);
+ return bdrv_co_pdiscard(bs->file->bs, offset, count);
}
static int64_t raw_getlength(BlockDriverState *bs)
{
- return bdrv_getlength(bs->file);
+ return bdrv_getlength(bs->file->bs);
}
static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
{
- return bdrv_get_info(bs->file, bdi);
+ return bdrv_get_info(bs->file->bs, bdi);
}
-static int raw_refresh_limits(BlockDriverState *bs)
+static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
{
- bs->bl = bs->file->bl;
- return 0;
+ if (bs->probed) {
+ /* To make it easier to protect the first sector, any probed
+ * image is restricted to read-modify-write on sub-sector
+ * operations. */
+ bs->bl.request_alignment = BDRV_SECTOR_SIZE;
+ }
}
static int raw_truncate(BlockDriverState *bs, int64_t offset)
{
- return bdrv_truncate(bs->file, offset);
-}
-
-static int raw_is_inserted(BlockDriverState *bs)
-{
- return bdrv_is_inserted(bs->file);
+ return bdrv_truncate(bs->file->bs, offset);
}
static int raw_media_changed(BlockDriverState *bs)
{
- return bdrv_media_changed(bs->file);
+ return bdrv_media_changed(bs->file->bs);
}
static void raw_eject(BlockDriverState *bs, bool eject_flag)
{
- bdrv_eject(bs->file, eject_flag);
+ bdrv_eject(bs->file->bs, eject_flag);
}
static void raw_lock_medium(BlockDriverState *bs, bool locked)
{
- bdrv_lock_medium(bs->file, locked);
+ bdrv_lock_medium(bs->file->bs, locked);
}
-static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
+static int raw_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
{
- return bdrv_ioctl(bs->file, req, buf);
-}
-
-static BlockDriverAIOCB *raw_aio_ioctl(BlockDriverState *bs,
- unsigned long int req, void *buf,
- BlockDriverCompletionFunc *cb,
- void *opaque)
-{
- return bdrv_aio_ioctl(bs->file, req, buf, cb, opaque);
+ return bdrv_co_ioctl(bs->file->bs, req, buf);
}
static int raw_has_zero_init(BlockDriverState *bs)
{
- return bdrv_has_zero_init(bs->file);
+ return bdrv_has_zero_init(bs->file->bs);
}
static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
{
- Error *local_err = NULL;
- int ret;
-
- ret = bdrv_create_file(filename, NULL, opts, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
- }
- return ret;
+ return bdrv_create_file(filename, opts, errp);
}
static int raw_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
- bs->sg = bs->file->sg;
+ bs->sg = bs->file->bs->sg;
+ bs->supported_write_flags = BDRV_REQ_FUA &
+ bs->file->bs->supported_write_flags;
+ bs->supported_zero_flags = (BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) &
+ bs->file->bs->supported_zero_flags;
+
+ if (bs->probed && !bdrv_is_read_only(bs)) {
+ fprintf(stderr,
+ "WARNING: Image format was not specified for '%s' and probing "
+ "guessed raw.\n"
+ " Automatically detecting the format is dangerous for "
+ "raw images, write operations on block 0 will be restricted.\n"
+ " Specify the 'raw' format explicitly to remove the "
+ "restrictions.\n",
+ bs->file->bs->filename);
+ }
+
return 0;
}
return 1;
}
-static BlockDriver bdrv_raw = {
+static int raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz)
+{
+ return bdrv_probe_blocksizes(bs->file->bs, bsz);
+}
+
+static int raw_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
+{
+ return bdrv_probe_geometry(bs->file->bs, geo);
+}
+
+BlockDriver bdrv_raw = {
.format_name = "raw",
.bdrv_probe = &raw_probe,
.bdrv_reopen_prepare = &raw_reopen_prepare,
.bdrv_open = &raw_open,
.bdrv_close = &raw_close,
- .bdrv_create2 = &raw_create,
- .bdrv_co_readv = &raw_co_readv,
- .bdrv_co_writev = &raw_co_writev,
- .bdrv_co_write_zeroes = &raw_co_write_zeroes,
- .bdrv_co_discard = &raw_co_discard,
+ .bdrv_create = &raw_create,
+ .bdrv_co_preadv = &raw_co_preadv,
+ .bdrv_co_pwritev = &raw_co_pwritev,
+ .bdrv_co_pwrite_zeroes = &raw_co_pwrite_zeroes,
+ .bdrv_co_pdiscard = &raw_co_pdiscard,
.bdrv_co_get_block_status = &raw_co_get_block_status,
.bdrv_truncate = &raw_truncate,
.bdrv_getlength = &raw_getlength,
.has_variable_length = true,
.bdrv_get_info = &raw_get_info,
.bdrv_refresh_limits = &raw_refresh_limits,
- .bdrv_is_inserted = &raw_is_inserted,
+ .bdrv_probe_blocksizes = &raw_probe_blocksizes,
+ .bdrv_probe_geometry = &raw_probe_geometry,
.bdrv_media_changed = &raw_media_changed,
.bdrv_eject = &raw_eject,
.bdrv_lock_medium = &raw_lock_medium,
- .bdrv_ioctl = &raw_ioctl,
- .bdrv_aio_ioctl = &raw_aio_ioctl,
+ .bdrv_co_ioctl = &raw_co_ioctl,
.create_opts = &raw_create_opts,
.bdrv_has_zero_init = &raw_has_zero_init
};
projects / qemu.git / blobdiff