mirror of
https://github.com/xemu-project/xemu.git
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ea2384d36e
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1037 c046a42c-6fe2-441c-8c8c-71466251a162
592 lines
14 KiB
C
592 lines
14 KiB
C
/*
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "vl.h"
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#include "block_int.h"
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static BlockDriverState *bdrv_first;
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static BlockDriver *first_drv;
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void bdrv_register(BlockDriver *bdrv)
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{
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bdrv->next = first_drv;
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first_drv = bdrv;
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}
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/* create a new block device (by default it is empty) */
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BlockDriverState *bdrv_new(const char *device_name)
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{
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BlockDriverState **pbs, *bs;
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bs = qemu_mallocz(sizeof(BlockDriverState));
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if(!bs)
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return NULL;
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pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
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if (device_name[0] != '\0') {
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/* insert at the end */
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pbs = &bdrv_first;
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while (*pbs != NULL)
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pbs = &(*pbs)->next;
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*pbs = bs;
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}
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return bs;
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}
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BlockDriver *bdrv_find_format(const char *format_name)
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{
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BlockDriver *drv1;
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
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if (!strcmp(drv1->format_name, format_name))
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return drv1;
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}
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return NULL;
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}
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int bdrv_create(BlockDriver *drv,
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const char *filename, int64_t size_in_sectors,
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const char *backing_file, int flags)
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{
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if (!drv->bdrv_create)
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return -ENOTSUP;
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return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
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}
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/* XXX: race condition possible */
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static void get_tmp_filename(char *filename, int size)
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{
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int fd;
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pstrcpy(filename, size, "/tmp/vl.XXXXXX");
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fd = mkstemp(filename);
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close(fd);
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}
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static BlockDriver *find_image_format(const char *filename)
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{
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int fd, ret, score, score_max;
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BlockDriver *drv1, *drv;
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uint8_t buf[1024];
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fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
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if (fd < 0)
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return NULL;
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ret = read(fd, buf, sizeof(buf));
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if (ret < 0) {
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close(fd);
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return NULL;
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}
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close(fd);
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drv = NULL;
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score_max = 0;
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
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score = drv1->bdrv_probe(buf, ret, filename);
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if (score > score_max) {
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score_max = score;
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drv = drv1;
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}
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}
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return drv;
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}
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int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot)
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{
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return bdrv_open2(bs, filename, snapshot, NULL);
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}
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int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot,
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BlockDriver *drv)
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{
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int ret;
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char tmp_filename[1024];
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bs->read_only = 0;
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bs->is_temporary = 0;
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bs->encrypted = 0;
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if (snapshot) {
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BlockDriverState *bs1;
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int64_t total_size;
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/* if snapshot, we create a temporary backing file and open it
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instead of opening 'filename' directly */
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/* if there is a backing file, use it */
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bs1 = bdrv_new("");
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if (!bs1) {
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return -1;
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}
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if (bdrv_open(bs1, filename, 0) < 0) {
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bdrv_delete(bs1);
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return -1;
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}
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total_size = bs1->total_sectors;
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bdrv_delete(bs1);
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get_tmp_filename(tmp_filename, sizeof(tmp_filename));
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/* XXX: use cow for linux as it is more efficient ? */
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if (bdrv_create(&bdrv_qcow, tmp_filename,
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total_size, filename, 0) < 0) {
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return -1;
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}
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filename = tmp_filename;
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bs->is_temporary = 1;
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}
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pstrcpy(bs->filename, sizeof(bs->filename), filename);
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if (!drv) {
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drv = find_image_format(filename);
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if (!drv)
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return -1;
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}
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bs->drv = drv;
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bs->opaque = qemu_mallocz(drv->instance_size);
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if (bs->opaque == NULL && drv->instance_size > 0)
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return -1;
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ret = drv->bdrv_open(bs, filename);
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if (ret < 0) {
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qemu_free(bs->opaque);
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return -1;
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}
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#ifndef _WIN32
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if (bs->is_temporary) {
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unlink(filename);
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}
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#endif
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if (bs->backing_file[0] != '\0' && drv->bdrv_is_allocated) {
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/* if there is a backing file, use it */
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bs->backing_hd = bdrv_new("");
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if (!bs->backing_hd) {
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fail:
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bdrv_close(bs);
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return -1;
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}
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if (bdrv_open(bs->backing_hd, bs->backing_file, 0) < 0)
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goto fail;
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}
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bs->inserted = 1;
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/* call the change callback */
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if (bs->change_cb)
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bs->change_cb(bs->change_opaque);
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return 0;
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}
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void bdrv_close(BlockDriverState *bs)
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{
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if (bs->inserted) {
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if (bs->backing_hd)
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bdrv_delete(bs->backing_hd);
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bs->drv->bdrv_close(bs);
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qemu_free(bs->opaque);
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#ifdef _WIN32
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if (bs->is_temporary) {
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unlink(bs->filename);
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}
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#endif
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bs->opaque = NULL;
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bs->drv = NULL;
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bs->inserted = 0;
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/* call the change callback */
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if (bs->change_cb)
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bs->change_cb(bs->change_opaque);
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}
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}
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void bdrv_delete(BlockDriverState *bs)
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{
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/* XXX: remove the driver list */
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bdrv_close(bs);
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qemu_free(bs);
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}
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/* commit COW file into the raw image */
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int bdrv_commit(BlockDriverState *bs)
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{
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int64_t i;
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int n, j;
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unsigned char sector[512];
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if (!bs->inserted)
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return -ENOENT;
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if (bs->read_only) {
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return -EACCES;
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}
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if (!bs->backing_hd) {
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return -ENOTSUP;
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}
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for (i = 0; i < bs->total_sectors;) {
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if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) {
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for(j = 0; j < n; j++) {
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if (bdrv_read(bs, i, sector, 1) != 0) {
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return -EIO;
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}
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if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
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return -EIO;
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}
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i++;
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}
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} else {
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i += n;
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}
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}
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return 0;
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}
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/* return -1 if error */
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int bdrv_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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int ret, n;
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BlockDriver *drv = bs->drv;
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if (!bs->inserted)
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return -1;
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while (nb_sectors > 0) {
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if (sector_num == 0 && bs->boot_sector_enabled) {
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memcpy(buf, bs->boot_sector_data, 512);
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n = 1;
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} else if (bs->backing_hd) {
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if (drv->bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) {
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ret = drv->bdrv_read(bs, sector_num, buf, n);
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if (ret < 0)
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return -1;
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} else {
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/* read from the base image */
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ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
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if (ret < 0)
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return -1;
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}
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} else {
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ret = drv->bdrv_read(bs, sector_num, buf, nb_sectors);
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if (ret < 0)
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return -1;
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/* no need to loop */
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break;
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}
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nb_sectors -= n;
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sector_num += n;
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buf += n * 512;
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}
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return 0;
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}
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/* return -1 if error */
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int bdrv_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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if (!bs->inserted)
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return -1;
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if (bs->read_only)
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return -1;
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return bs->drv->bdrv_write(bs, sector_num, buf, nb_sectors);
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}
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void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
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{
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*nb_sectors_ptr = bs->total_sectors;
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}
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/* force a given boot sector. */
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void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size)
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{
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bs->boot_sector_enabled = 1;
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if (size > 512)
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size = 512;
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memcpy(bs->boot_sector_data, data, size);
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memset(bs->boot_sector_data + size, 0, 512 - size);
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}
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void bdrv_set_geometry_hint(BlockDriverState *bs,
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int cyls, int heads, int secs)
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{
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bs->cyls = cyls;
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bs->heads = heads;
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bs->secs = secs;
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}
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void bdrv_set_type_hint(BlockDriverState *bs, int type)
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{
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bs->type = type;
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bs->removable = ((type == BDRV_TYPE_CDROM ||
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type == BDRV_TYPE_FLOPPY));
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}
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void bdrv_get_geometry_hint(BlockDriverState *bs,
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int *pcyls, int *pheads, int *psecs)
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{
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*pcyls = bs->cyls;
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*pheads = bs->heads;
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*psecs = bs->secs;
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}
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int bdrv_get_type_hint(BlockDriverState *bs)
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{
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return bs->type;
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}
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int bdrv_is_removable(BlockDriverState *bs)
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{
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return bs->removable;
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}
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int bdrv_is_read_only(BlockDriverState *bs)
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{
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return bs->read_only;
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}
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int bdrv_is_inserted(BlockDriverState *bs)
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{
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return bs->inserted;
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}
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int bdrv_is_locked(BlockDriverState *bs)
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{
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return bs->locked;
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}
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void bdrv_set_locked(BlockDriverState *bs, int locked)
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{
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bs->locked = locked;
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}
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void bdrv_set_change_cb(BlockDriverState *bs,
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void (*change_cb)(void *opaque), void *opaque)
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{
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bs->change_cb = change_cb;
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bs->change_opaque = opaque;
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}
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int bdrv_is_encrypted(BlockDriverState *bs)
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{
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if (bs->backing_hd && bs->backing_hd->encrypted)
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return 1;
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return bs->encrypted;
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}
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int bdrv_set_key(BlockDriverState *bs, const char *key)
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{
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int ret;
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if (bs->backing_hd && bs->backing_hd->encrypted) {
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ret = bdrv_set_key(bs->backing_hd, key);
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if (ret < 0)
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return ret;
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if (!bs->encrypted)
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return 0;
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}
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if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
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return -1;
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return bs->drv->bdrv_set_key(bs, key);
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}
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void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
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{
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if (!bs->inserted || !bs->drv) {
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buf[0] = '\0';
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} else {
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pstrcpy(buf, buf_size, bs->drv->format_name);
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}
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}
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void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
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void *opaque)
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{
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BlockDriver *drv;
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for (drv = first_drv; drv != NULL; drv = drv->next) {
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it(opaque, drv->format_name);
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}
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}
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BlockDriverState *bdrv_find(const char *name)
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{
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BlockDriverState *bs;
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for (bs = bdrv_first; bs != NULL; bs = bs->next) {
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if (!strcmp(name, bs->device_name))
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return bs;
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}
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return NULL;
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}
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void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
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{
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BlockDriverState *bs;
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for (bs = bdrv_first; bs != NULL; bs = bs->next) {
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it(opaque, bs->device_name);
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}
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}
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const char *bdrv_get_device_name(BlockDriverState *bs)
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{
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return bs->device_name;
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}
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void bdrv_info(void)
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{
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BlockDriverState *bs;
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for (bs = bdrv_first; bs != NULL; bs = bs->next) {
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term_printf("%s:", bs->device_name);
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term_printf(" type=");
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switch(bs->type) {
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case BDRV_TYPE_HD:
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term_printf("hd");
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break;
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case BDRV_TYPE_CDROM:
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term_printf("cdrom");
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break;
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case BDRV_TYPE_FLOPPY:
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term_printf("floppy");
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break;
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}
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term_printf(" removable=%d", bs->removable);
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if (bs->removable) {
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term_printf(" locked=%d", bs->locked);
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}
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if (bs->inserted) {
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term_printf(" file=%s", bs->filename);
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if (bs->backing_file[0] != '\0')
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term_printf(" backing_file=%s", bs->backing_file);
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term_printf(" ro=%d", bs->read_only);
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term_printf(" drv=%s", bs->drv->format_name);
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if (bs->encrypted)
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term_printf(" encrypted");
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} else {
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term_printf(" [not inserted]");
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}
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term_printf("\n");
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}
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}
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/**************************************************************/
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/* RAW block driver */
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typedef struct BDRVRawState {
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int fd;
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} BDRVRawState;
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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; /* maybe */
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}
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static int raw_open(BlockDriverState *bs, const char *filename)
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{
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BDRVRawState *s = bs->opaque;
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int fd;
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int64_t size;
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fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE);
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if (fd < 0) {
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fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE);
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if (fd < 0)
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return -1;
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bs->read_only = 1;
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}
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size = lseek64(fd, 0, SEEK_END);
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bs->total_sectors = size / 512;
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s->fd = fd;
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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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BDRVRawState *s = bs->opaque;
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int ret;
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lseek64(s->fd, sector_num * 512, SEEK_SET);
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ret = read(s->fd, buf, nb_sectors * 512);
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if (ret != nb_sectors * 512)
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return -1;
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return 0;
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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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BDRVRawState *s = bs->opaque;
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int ret;
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lseek64(s->fd, sector_num * 512, SEEK_SET);
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ret = write(s->fd, buf, nb_sectors * 512);
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if (ret != nb_sectors * 512)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int raw_close(BlockDriverState *bs)
|
|
{
|
|
BDRVRawState *s = bs->opaque;
|
|
close(s->fd);
|
|
}
|
|
|
|
static int raw_create(const char *filename, int64_t total_size,
|
|
const char *backing_file, int flags)
|
|
{
|
|
int fd;
|
|
|
|
if (flags || backing_file)
|
|
return -ENOTSUP;
|
|
|
|
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE,
|
|
0644);
|
|
if (fd < 0)
|
|
return -EIO;
|
|
ftruncate64(fd, total_size * 512);
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
BlockDriver bdrv_raw = {
|
|
"raw",
|
|
sizeof(BDRVRawState),
|
|
raw_probe,
|
|
raw_open,
|
|
raw_read,
|
|
raw_write,
|
|
raw_close,
|
|
raw_create,
|
|
};
|
|
|
|
void bdrv_init(void)
|
|
{
|
|
bdrv_register(&bdrv_raw);
|
|
#ifndef _WIN32
|
|
bdrv_register(&bdrv_cow);
|
|
#endif
|
|
bdrv_register(&bdrv_qcow);
|
|
bdrv_register(&bdrv_vmdk);
|
|
}
|