--- /dev/null
+/* BlockDriver implementation for "raw"
+ *
+ * Copyright (C) 2010, 2013, Red Hat, Inc.
+ * Copyright (C) 2010, Blue Swirl <blauwirbel@gmail.com>
+ * Copyright (C) 2009, Anthony Liguori <aliguori@us.ibm.com>
+ *
+ * Author:
+ * Laszlo Ersek <lersek@redhat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "block/block_int.h"
+#include "qemu/option.h"
+
+static QemuOptsList raw_create_opts = {
+ .name = "raw-create-opts",
+ .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
+ .desc = {
+ {
+ .name = BLOCK_OPT_SIZE,
+ .type = QEMU_OPT_SIZE,
+ .help = "Virtual disk size"
+ },
+ { /* end of list */ }
+ }
+};
+
+static int raw_reopen_prepare(BDRVReopenState *reopen_state,
+ BlockReopenQueue *queue, Error **errp)
+{
+ return 0;
+}
+
+static int coroutine_fn raw_co_readv(BlockDriverState *bs, int64_t sector_num,
+ int nb_sectors, QEMUIOVector *qiov)
+{
+ BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
+ return bdrv_co_readv(bs->file, sector_num, nb_sectors, qiov);
+}
+
+static int coroutine_fn raw_co_writev(BlockDriverState *bs, int64_t sector_num,
+ int nb_sectors, QEMUIOVector *qiov)
+{
+ void *buf = NULL;
+ BlockDriver *drv;
+ QEMUIOVector local_qiov;
+ int ret;
+
+ if (bs->probed && sector_num == 0) {
+ /* As long as these conditions are true, we can't get partial writes to
+ * the probe buffer and can just directly check the request. */
+ QEMU_BUILD_BUG_ON(BLOCK_PROBE_BUF_SIZE != 512);
+ QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != 512);
+
+ if (nb_sectors == 0) {
+ /* qemu_iovec_to_buf() would fail, but we want to return success
+ * instead of -EINVAL in this case. */
+ return 0;
+ }
+
+ buf = qemu_try_blockalign(bs->file, 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);
+ ret = bdrv_co_writev(bs->file, sector_num, nb_sectors, qiov);
+
+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)
+{
+ *pnum = nb_sectors;
+ 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)
+{
+ return bdrv_co_write_zeroes(bs->file, sector_num, nb_sectors, flags);
+}
+
+static int coroutine_fn raw_co_discard(BlockDriverState *bs,
+ int64_t sector_num, int nb_sectors)
+{
+ return bdrv_co_discard(bs->file, sector_num, nb_sectors);
+}
+
+static int64_t raw_getlength(BlockDriverState *bs)
+{
+ return bdrv_getlength(bs->file);
+}
+
+static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
+{
+ return bdrv_get_info(bs->file, bdi);
+}
+
+static void raw_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+ bs->bl = bs->file->bl;
+}
+
+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);
+}
+
+static int raw_media_changed(BlockDriverState *bs)
+{
+ return bdrv_media_changed(bs->file);
+}
+
+static void raw_eject(BlockDriverState *bs, bool eject_flag)
+{
+ bdrv_eject(bs->file, eject_flag);
+}
+
+static void raw_lock_medium(BlockDriverState *bs, bool locked)
+{
+ bdrv_lock_medium(bs->file, locked);
+}
+
+static int raw_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
+{
+ return bdrv_ioctl(bs->file, req, buf);
+}
+
+static BlockAIOCB *raw_aio_ioctl(BlockDriverState *bs,
+ unsigned long int req, void *buf,
+ BlockCompletionFunc *cb,
+ void *opaque)
+{
+ return bdrv_aio_ioctl(bs->file, req, buf, cb, opaque);
+}
+
+static int raw_has_zero_init(BlockDriverState *bs)
+{
+ return bdrv_has_zero_init(bs->file);
+}
+
+static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
+{
+ Error *local_err = NULL;
+ int ret;
+
+ ret = bdrv_create_file(filename, opts, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
+ }
+ return ret;
+}
+
+static int raw_open(BlockDriverState *bs, QDict *options, int flags,
+ Error **errp)
+{
+ bs->sg = bs->file->sg;
+
+ 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->filename);
+ }
+
+ return 0;
+}
+
+static void raw_close(BlockDriverState *bs)
+{
+}
+
+static int raw_probe(const uint8_t *buf, int buf_size, const char *filename)
+{
+ /* smallest possible positive score so that raw is used if and only if no
+ * other block driver works
+ */
+ return 1;
+}
+
+static int raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz)
+{
+ return bdrv_probe_blocksizes(bs->file, bsz);
+}
+
+static int raw_probe_geometry(BlockDriverState *bs, HDGeometry *geo)
+{
+ return bdrv_probe_geometry(bs->file, 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_create = &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_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_probe_blocksizes = &raw_probe_blocksizes,
+ .bdrv_probe_geometry = &raw_probe_geometry,
+ .bdrv_is_inserted = &raw_is_inserted,
+ .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,
+ .create_opts = &raw_create_opts,
+ .bdrv_has_zero_init = &raw_has_zero_init
+};
+
+static void bdrv_raw_init(void)
+{
+ bdrv_register(&bdrv_raw);
+}
+
+block_init(bdrv_raw_init);
Code Review / kvmfornfv.git / blobdiff