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/*
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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 "config-host.h" |
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#ifdef HOST_BSD
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/* include native header before sys-queue.h */
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#include <sys/queue.h> |
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#endif
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|
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#include "qemu-common.h" |
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#include "monitor.h" |
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#include "block_int.h" |
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#include "module.h" |
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|
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#ifdef HOST_BSD
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <sys/ioctl.h> |
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#ifndef __DragonFly__
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#include <sys/disk.h> |
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#endif
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#endif
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|
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#ifdef _WIN32
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#include <windows.h> |
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#endif
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|
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#define SECTOR_BITS 9 |
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#define SECTOR_SIZE (1 << SECTOR_BITS) |
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typedef struct BlockDriverAIOCBSync { |
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BlockDriverAIOCB common; |
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QEMUBH *bh; |
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int ret;
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/* vector translation state */
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QEMUIOVector *qiov; |
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uint8_t *bounce; |
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int is_write;
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} BlockDriverAIOCBSync; |
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|
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static BlockDriverAIOCB *bdrv_aio_readv_em(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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static BlockDriverAIOCB *bdrv_aio_writev_em(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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static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
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static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
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uint8_t *buf, int nb_sectors);
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static int bdrv_write_em(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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BlockDriverState *bdrv_first; |
74 |
|
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static BlockDriver *first_drv;
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|
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int path_is_absolute(const char *path) |
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{ |
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const char *p; |
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#ifdef _WIN32
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/* specific case for names like: "\\.\d:" */
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if (*path == '/' || *path == '\\') |
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return 1; |
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#endif
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p = strchr(path, ':');
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if (p)
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p++; |
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else
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p = path; |
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#ifdef _WIN32
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return (*p == '/' || *p == '\\'); |
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#else
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return (*p == '/'); |
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#endif
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} |
96 |
|
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/* if filename is absolute, just copy it to dest. Otherwise, build a
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path to it by considering it is relative to base_path. URL are
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supported. */
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void path_combine(char *dest, int dest_size, |
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const char *base_path, |
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const char *filename) |
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{ |
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const char *p, *p1; |
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int len;
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|
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if (dest_size <= 0) |
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return;
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if (path_is_absolute(filename)) {
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pstrcpy(dest, dest_size, filename); |
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} else {
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p = strchr(base_path, ':');
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if (p)
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p++; |
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else
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p = base_path; |
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p1 = strrchr(base_path, '/');
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#ifdef _WIN32
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{ |
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const char *p2; |
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p2 = strrchr(base_path, '\\');
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if (!p1 || p2 > p1)
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p1 = p2; |
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} |
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#endif
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if (p1)
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p1++; |
128 |
else
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p1 = base_path; |
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if (p1 > p)
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p = p1; |
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len = p - base_path; |
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if (len > dest_size - 1) |
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len = dest_size - 1;
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memcpy(dest, base_path, len); |
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dest[len] = '\0';
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pstrcat(dest, dest_size, filename); |
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} |
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} |
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void bdrv_register(BlockDriver *bdrv)
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{ |
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if (!bdrv->bdrv_aio_readv) {
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/* add AIO emulation layer */
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bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
147 |
bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
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bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; |
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bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
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} else if (!bdrv->bdrv_read) { |
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/* add synchronous IO emulation layer */
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bdrv->bdrv_read = bdrv_read_em; |
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bdrv->bdrv_write = bdrv_write_em; |
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} |
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aio_pool_init(&bdrv->aio_pool, bdrv->aiocb_size, bdrv->bdrv_aio_cancel); |
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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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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_create2(BlockDriver *drv,
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const char *filename, int64_t size_in_sectors, |
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const char *backing_file, const char *backing_format, |
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int flags)
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{ |
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if (drv->bdrv_create2)
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return drv->bdrv_create2(filename, size_in_sectors, backing_file,
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backing_format, flags); |
195 |
if (drv->bdrv_create)
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return drv->bdrv_create(filename, size_in_sectors, backing_file,
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flags); |
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return -ENOTSUP;
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} |
200 |
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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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} |
209 |
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#ifdef _WIN32
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void get_tmp_filename(char *filename, int size) |
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{ |
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char temp_dir[MAX_PATH];
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GetTempPath(MAX_PATH, temp_dir); |
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GetTempFileName(temp_dir, "qem", 0, filename); |
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} |
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#else
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void get_tmp_filename(char *filename, int size) |
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{ |
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int fd;
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const char *tmpdir; |
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/* XXX: race condition possible */
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tmpdir = getenv("TMPDIR");
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if (!tmpdir)
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tmpdir = "/tmp";
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snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
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fd = mkstemp(filename); |
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close(fd); |
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} |
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#endif
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#ifdef _WIN32
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static int is_windows_drive_prefix(const char *filename) |
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{ |
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return (((filename[0] >= 'a' && filename[0] <= 'z') || |
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(filename[0] >= 'A' && filename[0] <= 'Z')) && |
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filename[1] == ':'); |
239 |
} |
240 |
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static int is_windows_drive(const char *filename) |
242 |
{ |
243 |
if (is_windows_drive_prefix(filename) &&
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filename[2] == '\0') |
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return 1; |
246 |
if (strstart(filename, "\\\\.\\", NULL) || |
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strstart(filename, "//./", NULL)) |
248 |
return 1; |
249 |
return 0; |
250 |
} |
251 |
#endif
|
252 |
|
253 |
static BlockDriver *find_protocol(const char *filename) |
254 |
{ |
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BlockDriver *drv1; |
256 |
char protocol[128]; |
257 |
int len;
|
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const char *p; |
259 |
|
260 |
#ifdef _WIN32
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if (is_windows_drive(filename) ||
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is_windows_drive_prefix(filename)) |
263 |
return bdrv_find_format("raw"); |
264 |
#endif
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p = strchr(filename, ':');
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if (!p)
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return bdrv_find_format("raw"); |
268 |
len = p - filename; |
269 |
if (len > sizeof(protocol) - 1) |
270 |
len = sizeof(protocol) - 1; |
271 |
memcpy(protocol, filename, len); |
272 |
protocol[len] = '\0';
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273 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
274 |
if (drv1->protocol_name &&
|
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!strcmp(drv1->protocol_name, protocol)) |
276 |
return drv1;
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277 |
} |
278 |
return NULL; |
279 |
} |
280 |
|
281 |
/* XXX: force raw format if block or character device ? It would
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simplify the BSD case */
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static BlockDriver *find_image_format(const char *filename) |
284 |
{ |
285 |
int ret, score, score_max;
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BlockDriver *drv1, *drv; |
287 |
uint8_t buf[2048];
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BlockDriverState *bs; |
289 |
|
290 |
/* detect host devices. By convention, /dev/cdrom[N] is always
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291 |
recognized as a host CDROM */
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292 |
if (strstart(filename, "/dev/cdrom", NULL)) |
293 |
return bdrv_find_format("host_device"); |
294 |
#ifdef _WIN32
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295 |
if (is_windows_drive(filename))
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296 |
return bdrv_find_format("host_device"); |
297 |
#else
|
298 |
{ |
299 |
struct stat st;
|
300 |
if (stat(filename, &st) >= 0 && |
301 |
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
302 |
return bdrv_find_format("host_device"); |
303 |
} |
304 |
} |
305 |
#endif
|
306 |
|
307 |
drv = find_protocol(filename); |
308 |
/* no need to test disk image formats for vvfat */
|
309 |
if (strcmp(drv->format_name, "vvfat") == 0) |
310 |
return drv;
|
311 |
|
312 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
313 |
if (ret < 0) |
314 |
return NULL; |
315 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
316 |
bdrv_delete(bs); |
317 |
if (ret < 0) { |
318 |
return NULL; |
319 |
} |
320 |
|
321 |
score_max = 0;
|
322 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
323 |
if (drv1->bdrv_probe) {
|
324 |
score = drv1->bdrv_probe(buf, ret, filename); |
325 |
if (score > score_max) {
|
326 |
score_max = score; |
327 |
drv = drv1; |
328 |
} |
329 |
} |
330 |
} |
331 |
return drv;
|
332 |
} |
333 |
|
334 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
335 |
{ |
336 |
BlockDriverState *bs; |
337 |
int ret;
|
338 |
|
339 |
bs = bdrv_new("");
|
340 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
|
341 |
if (ret < 0) { |
342 |
bdrv_delete(bs); |
343 |
return ret;
|
344 |
} |
345 |
bs->growable = 1;
|
346 |
*pbs = bs; |
347 |
return 0; |
348 |
} |
349 |
|
350 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
351 |
{ |
352 |
return bdrv_open2(bs, filename, flags, NULL); |
353 |
} |
354 |
|
355 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
356 |
BlockDriver *drv) |
357 |
{ |
358 |
int ret, open_flags;
|
359 |
char tmp_filename[PATH_MAX];
|
360 |
char backing_filename[PATH_MAX];
|
361 |
|
362 |
bs->read_only = 0;
|
363 |
bs->is_temporary = 0;
|
364 |
bs->encrypted = 0;
|
365 |
bs->valid_key = 0;
|
366 |
/* buffer_alignment defaulted to 512, drivers can change this value */
|
367 |
bs->buffer_alignment = 512;
|
368 |
|
369 |
if (flags & BDRV_O_SNAPSHOT) {
|
370 |
BlockDriverState *bs1; |
371 |
int64_t total_size; |
372 |
int is_protocol = 0; |
373 |
|
374 |
/* if snapshot, we create a temporary backing file and open it
|
375 |
instead of opening 'filename' directly */
|
376 |
|
377 |
/* if there is a backing file, use it */
|
378 |
bs1 = bdrv_new("");
|
379 |
ret = bdrv_open2(bs1, filename, 0, drv);
|
380 |
if (ret < 0) { |
381 |
bdrv_delete(bs1); |
382 |
return ret;
|
383 |
} |
384 |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
385 |
|
386 |
if (bs1->drv && bs1->drv->protocol_name)
|
387 |
is_protocol = 1;
|
388 |
|
389 |
bdrv_delete(bs1); |
390 |
|
391 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
392 |
|
393 |
/* Real path is meaningless for protocols */
|
394 |
if (is_protocol)
|
395 |
snprintf(backing_filename, sizeof(backing_filename),
|
396 |
"%s", filename);
|
397 |
else
|
398 |
realpath(filename, backing_filename); |
399 |
|
400 |
ret = bdrv_create2(bdrv_find_format("qcow2"), tmp_filename,
|
401 |
total_size, backing_filename, |
402 |
(drv ? drv->format_name : NULL), 0); |
403 |
if (ret < 0) { |
404 |
return ret;
|
405 |
} |
406 |
filename = tmp_filename; |
407 |
drv = bdrv_find_format("qcow2");
|
408 |
bs->is_temporary = 1;
|
409 |
} |
410 |
|
411 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
412 |
if (flags & BDRV_O_FILE) {
|
413 |
drv = find_protocol(filename); |
414 |
} else if (!drv) { |
415 |
drv = find_image_format(filename); |
416 |
} |
417 |
if (!drv) {
|
418 |
ret = -ENOENT; |
419 |
goto unlink_and_fail;
|
420 |
} |
421 |
bs->drv = drv; |
422 |
bs->opaque = qemu_mallocz(drv->instance_size); |
423 |
/* Note: for compatibility, we open disk image files as RDWR, and
|
424 |
RDONLY as fallback */
|
425 |
if (!(flags & BDRV_O_FILE))
|
426 |
open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK); |
427 |
else
|
428 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
429 |
ret = drv->bdrv_open(bs, filename, open_flags); |
430 |
if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
|
431 |
ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
432 |
bs->read_only = 1;
|
433 |
} |
434 |
if (ret < 0) { |
435 |
qemu_free(bs->opaque); |
436 |
bs->opaque = NULL;
|
437 |
bs->drv = NULL;
|
438 |
unlink_and_fail:
|
439 |
if (bs->is_temporary)
|
440 |
unlink(filename); |
441 |
return ret;
|
442 |
} |
443 |
if (drv->bdrv_getlength) {
|
444 |
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
445 |
} |
446 |
#ifndef _WIN32
|
447 |
if (bs->is_temporary) {
|
448 |
unlink(filename); |
449 |
} |
450 |
#endif
|
451 |
if (bs->backing_file[0] != '\0') { |
452 |
/* if there is a backing file, use it */
|
453 |
BlockDriver *back_drv = NULL;
|
454 |
bs->backing_hd = bdrv_new("");
|
455 |
path_combine(backing_filename, sizeof(backing_filename),
|
456 |
filename, bs->backing_file); |
457 |
if (bs->backing_format[0] != '\0') |
458 |
back_drv = bdrv_find_format(bs->backing_format); |
459 |
ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, |
460 |
back_drv); |
461 |
if (ret < 0) { |
462 |
bdrv_close(bs); |
463 |
return ret;
|
464 |
} |
465 |
} |
466 |
|
467 |
if (!bdrv_key_required(bs)) {
|
468 |
/* call the change callback */
|
469 |
bs->media_changed = 1;
|
470 |
if (bs->change_cb)
|
471 |
bs->change_cb(bs->change_opaque); |
472 |
} |
473 |
return 0; |
474 |
} |
475 |
|
476 |
void bdrv_close(BlockDriverState *bs)
|
477 |
{ |
478 |
if (bs->drv) {
|
479 |
if (bs->backing_hd)
|
480 |
bdrv_delete(bs->backing_hd); |
481 |
bs->drv->bdrv_close(bs); |
482 |
qemu_free(bs->opaque); |
483 |
#ifdef _WIN32
|
484 |
if (bs->is_temporary) {
|
485 |
unlink(bs->filename); |
486 |
} |
487 |
#endif
|
488 |
bs->opaque = NULL;
|
489 |
bs->drv = NULL;
|
490 |
|
491 |
/* call the change callback */
|
492 |
bs->media_changed = 1;
|
493 |
if (bs->change_cb)
|
494 |
bs->change_cb(bs->change_opaque); |
495 |
} |
496 |
} |
497 |
|
498 |
void bdrv_delete(BlockDriverState *bs)
|
499 |
{ |
500 |
BlockDriverState **pbs; |
501 |
|
502 |
pbs = &bdrv_first; |
503 |
while (*pbs != bs && *pbs != NULL) |
504 |
pbs = &(*pbs)->next; |
505 |
if (*pbs == bs)
|
506 |
*pbs = bs->next; |
507 |
|
508 |
bdrv_close(bs); |
509 |
qemu_free(bs); |
510 |
} |
511 |
|
512 |
/*
|
513 |
* Run consistency checks on an image
|
514 |
*
|
515 |
* Returns the number of errors or -errno when an internal error occurs
|
516 |
*/
|
517 |
int bdrv_check(BlockDriverState *bs)
|
518 |
{ |
519 |
if (bs->drv->bdrv_check == NULL) { |
520 |
return -ENOTSUP;
|
521 |
} |
522 |
|
523 |
return bs->drv->bdrv_check(bs);
|
524 |
} |
525 |
|
526 |
/* commit COW file into the raw image */
|
527 |
int bdrv_commit(BlockDriverState *bs)
|
528 |
{ |
529 |
BlockDriver *drv = bs->drv; |
530 |
int64_t i, total_sectors; |
531 |
int n, j;
|
532 |
unsigned char sector[512]; |
533 |
|
534 |
if (!drv)
|
535 |
return -ENOMEDIUM;
|
536 |
|
537 |
if (bs->read_only) {
|
538 |
return -EACCES;
|
539 |
} |
540 |
|
541 |
if (!bs->backing_hd) {
|
542 |
return -ENOTSUP;
|
543 |
} |
544 |
|
545 |
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
546 |
for (i = 0; i < total_sectors;) { |
547 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
548 |
for(j = 0; j < n; j++) { |
549 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
550 |
return -EIO;
|
551 |
} |
552 |
|
553 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
554 |
return -EIO;
|
555 |
} |
556 |
i++; |
557 |
} |
558 |
} else {
|
559 |
i += n; |
560 |
} |
561 |
} |
562 |
|
563 |
if (drv->bdrv_make_empty)
|
564 |
return drv->bdrv_make_empty(bs);
|
565 |
|
566 |
return 0; |
567 |
} |
568 |
|
569 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
570 |
size_t size) |
571 |
{ |
572 |
int64_t len; |
573 |
|
574 |
if (!bdrv_is_inserted(bs))
|
575 |
return -ENOMEDIUM;
|
576 |
|
577 |
if (bs->growable)
|
578 |
return 0; |
579 |
|
580 |
len = bdrv_getlength(bs); |
581 |
|
582 |
if (offset < 0) |
583 |
return -EIO;
|
584 |
|
585 |
if ((offset > len) || (len - offset < size))
|
586 |
return -EIO;
|
587 |
|
588 |
return 0; |
589 |
} |
590 |
|
591 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
592 |
int nb_sectors)
|
593 |
{ |
594 |
return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
595 |
} |
596 |
|
597 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
598 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
599 |
uint8_t *buf, int nb_sectors)
|
600 |
{ |
601 |
BlockDriver *drv = bs->drv; |
602 |
|
603 |
if (!drv)
|
604 |
return -ENOMEDIUM;
|
605 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
606 |
return -EIO;
|
607 |
|
608 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
609 |
} |
610 |
|
611 |
/* Return < 0 if error. Important errors are:
|
612 |
-EIO generic I/O error (may happen for all errors)
|
613 |
-ENOMEDIUM No media inserted.
|
614 |
-EINVAL Invalid sector number or nb_sectors
|
615 |
-EACCES Trying to write a read-only device
|
616 |
*/
|
617 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
618 |
const uint8_t *buf, int nb_sectors) |
619 |
{ |
620 |
BlockDriver *drv = bs->drv; |
621 |
if (!bs->drv)
|
622 |
return -ENOMEDIUM;
|
623 |
if (bs->read_only)
|
624 |
return -EACCES;
|
625 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
626 |
return -EIO;
|
627 |
|
628 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
629 |
} |
630 |
|
631 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
632 |
void *buf, int count1) |
633 |
{ |
634 |
uint8_t tmp_buf[SECTOR_SIZE]; |
635 |
int len, nb_sectors, count;
|
636 |
int64_t sector_num; |
637 |
|
638 |
count = count1; |
639 |
/* first read to align to sector start */
|
640 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
641 |
if (len > count)
|
642 |
len = count; |
643 |
sector_num = offset >> SECTOR_BITS; |
644 |
if (len > 0) { |
645 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
646 |
return -EIO;
|
647 |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
648 |
count -= len; |
649 |
if (count == 0) |
650 |
return count1;
|
651 |
sector_num++; |
652 |
buf += len; |
653 |
} |
654 |
|
655 |
/* read the sectors "in place" */
|
656 |
nb_sectors = count >> SECTOR_BITS; |
657 |
if (nb_sectors > 0) { |
658 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
659 |
return -EIO;
|
660 |
sector_num += nb_sectors; |
661 |
len = nb_sectors << SECTOR_BITS; |
662 |
buf += len; |
663 |
count -= len; |
664 |
} |
665 |
|
666 |
/* add data from the last sector */
|
667 |
if (count > 0) { |
668 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
669 |
return -EIO;
|
670 |
memcpy(buf, tmp_buf, count); |
671 |
} |
672 |
return count1;
|
673 |
} |
674 |
|
675 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
676 |
const void *buf, int count1) |
677 |
{ |
678 |
uint8_t tmp_buf[SECTOR_SIZE]; |
679 |
int len, nb_sectors, count;
|
680 |
int64_t sector_num; |
681 |
|
682 |
count = count1; |
683 |
/* first write to align to sector start */
|
684 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
685 |
if (len > count)
|
686 |
len = count; |
687 |
sector_num = offset >> SECTOR_BITS; |
688 |
if (len > 0) { |
689 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
690 |
return -EIO;
|
691 |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
692 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
693 |
return -EIO;
|
694 |
count -= len; |
695 |
if (count == 0) |
696 |
return count1;
|
697 |
sector_num++; |
698 |
buf += len; |
699 |
} |
700 |
|
701 |
/* write the sectors "in place" */
|
702 |
nb_sectors = count >> SECTOR_BITS; |
703 |
if (nb_sectors > 0) { |
704 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
705 |
return -EIO;
|
706 |
sector_num += nb_sectors; |
707 |
len = nb_sectors << SECTOR_BITS; |
708 |
buf += len; |
709 |
count -= len; |
710 |
} |
711 |
|
712 |
/* add data from the last sector */
|
713 |
if (count > 0) { |
714 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
715 |
return -EIO;
|
716 |
memcpy(tmp_buf, buf, count); |
717 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
718 |
return -EIO;
|
719 |
} |
720 |
return count1;
|
721 |
} |
722 |
|
723 |
/**
|
724 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
725 |
*/
|
726 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
727 |
{ |
728 |
BlockDriver *drv = bs->drv; |
729 |
if (!drv)
|
730 |
return -ENOMEDIUM;
|
731 |
if (!drv->bdrv_truncate)
|
732 |
return -ENOTSUP;
|
733 |
return drv->bdrv_truncate(bs, offset);
|
734 |
} |
735 |
|
736 |
/**
|
737 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
738 |
*/
|
739 |
int64_t bdrv_getlength(BlockDriverState *bs) |
740 |
{ |
741 |
BlockDriver *drv = bs->drv; |
742 |
if (!drv)
|
743 |
return -ENOMEDIUM;
|
744 |
if (!drv->bdrv_getlength) {
|
745 |
/* legacy mode */
|
746 |
return bs->total_sectors * SECTOR_SIZE;
|
747 |
} |
748 |
return drv->bdrv_getlength(bs);
|
749 |
} |
750 |
|
751 |
/* return 0 as number of sectors if no device present or error */
|
752 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
753 |
{ |
754 |
int64_t length; |
755 |
length = bdrv_getlength(bs); |
756 |
if (length < 0) |
757 |
length = 0;
|
758 |
else
|
759 |
length = length >> SECTOR_BITS; |
760 |
*nb_sectors_ptr = length; |
761 |
} |
762 |
|
763 |
struct partition {
|
764 |
uint8_t boot_ind; /* 0x80 - active */
|
765 |
uint8_t head; /* starting head */
|
766 |
uint8_t sector; /* starting sector */
|
767 |
uint8_t cyl; /* starting cylinder */
|
768 |
uint8_t sys_ind; /* What partition type */
|
769 |
uint8_t end_head; /* end head */
|
770 |
uint8_t end_sector; /* end sector */
|
771 |
uint8_t end_cyl; /* end cylinder */
|
772 |
uint32_t start_sect; /* starting sector counting from 0 */
|
773 |
uint32_t nr_sects; /* nr of sectors in partition */
|
774 |
} __attribute__((packed)); |
775 |
|
776 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
777 |
static int guess_disk_lchs(BlockDriverState *bs, |
778 |
int *pcylinders, int *pheads, int *psectors) |
779 |
{ |
780 |
uint8_t buf[512];
|
781 |
int ret, i, heads, sectors, cylinders;
|
782 |
struct partition *p;
|
783 |
uint32_t nr_sects; |
784 |
uint64_t nb_sectors; |
785 |
|
786 |
bdrv_get_geometry(bs, &nb_sectors); |
787 |
|
788 |
ret = bdrv_read(bs, 0, buf, 1); |
789 |
if (ret < 0) |
790 |
return -1; |
791 |
/* test msdos magic */
|
792 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
793 |
return -1; |
794 |
for(i = 0; i < 4; i++) { |
795 |
p = ((struct partition *)(buf + 0x1be)) + i; |
796 |
nr_sects = le32_to_cpu(p->nr_sects); |
797 |
if (nr_sects && p->end_head) {
|
798 |
/* We make the assumption that the partition terminates on
|
799 |
a cylinder boundary */
|
800 |
heads = p->end_head + 1;
|
801 |
sectors = p->end_sector & 63;
|
802 |
if (sectors == 0) |
803 |
continue;
|
804 |
cylinders = nb_sectors / (heads * sectors); |
805 |
if (cylinders < 1 || cylinders > 16383) |
806 |
continue;
|
807 |
*pheads = heads; |
808 |
*psectors = sectors; |
809 |
*pcylinders = cylinders; |
810 |
#if 0
|
811 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
812 |
cylinders, heads, sectors);
|
813 |
#endif
|
814 |
return 0; |
815 |
} |
816 |
} |
817 |
return -1; |
818 |
} |
819 |
|
820 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
821 |
{ |
822 |
int translation, lba_detected = 0; |
823 |
int cylinders, heads, secs;
|
824 |
uint64_t nb_sectors; |
825 |
|
826 |
/* if a geometry hint is available, use it */
|
827 |
bdrv_get_geometry(bs, &nb_sectors); |
828 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
829 |
translation = bdrv_get_translation_hint(bs); |
830 |
if (cylinders != 0) { |
831 |
*pcyls = cylinders; |
832 |
*pheads = heads; |
833 |
*psecs = secs; |
834 |
} else {
|
835 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
836 |
if (heads > 16) { |
837 |
/* if heads > 16, it means that a BIOS LBA
|
838 |
translation was active, so the default
|
839 |
hardware geometry is OK */
|
840 |
lba_detected = 1;
|
841 |
goto default_geometry;
|
842 |
} else {
|
843 |
*pcyls = cylinders; |
844 |
*pheads = heads; |
845 |
*psecs = secs; |
846 |
/* disable any translation to be in sync with
|
847 |
the logical geometry */
|
848 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
849 |
bdrv_set_translation_hint(bs, |
850 |
BIOS_ATA_TRANSLATION_NONE); |
851 |
} |
852 |
} |
853 |
} else {
|
854 |
default_geometry:
|
855 |
/* if no geometry, use a standard physical disk geometry */
|
856 |
cylinders = nb_sectors / (16 * 63); |
857 |
|
858 |
if (cylinders > 16383) |
859 |
cylinders = 16383;
|
860 |
else if (cylinders < 2) |
861 |
cylinders = 2;
|
862 |
*pcyls = cylinders; |
863 |
*pheads = 16;
|
864 |
*psecs = 63;
|
865 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
866 |
if ((*pcyls * *pheads) <= 131072) { |
867 |
bdrv_set_translation_hint(bs, |
868 |
BIOS_ATA_TRANSLATION_LARGE); |
869 |
} else {
|
870 |
bdrv_set_translation_hint(bs, |
871 |
BIOS_ATA_TRANSLATION_LBA); |
872 |
} |
873 |
} |
874 |
} |
875 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
876 |
} |
877 |
} |
878 |
|
879 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
880 |
int cyls, int heads, int secs) |
881 |
{ |
882 |
bs->cyls = cyls; |
883 |
bs->heads = heads; |
884 |
bs->secs = secs; |
885 |
} |
886 |
|
887 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
888 |
{ |
889 |
bs->type = type; |
890 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
891 |
type == BDRV_TYPE_FLOPPY)); |
892 |
} |
893 |
|
894 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
895 |
{ |
896 |
bs->translation = translation; |
897 |
} |
898 |
|
899 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
900 |
int *pcyls, int *pheads, int *psecs) |
901 |
{ |
902 |
*pcyls = bs->cyls; |
903 |
*pheads = bs->heads; |
904 |
*psecs = bs->secs; |
905 |
} |
906 |
|
907 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
908 |
{ |
909 |
return bs->type;
|
910 |
} |
911 |
|
912 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
913 |
{ |
914 |
return bs->translation;
|
915 |
} |
916 |
|
917 |
int bdrv_is_removable(BlockDriverState *bs)
|
918 |
{ |
919 |
return bs->removable;
|
920 |
} |
921 |
|
922 |
int bdrv_is_read_only(BlockDriverState *bs)
|
923 |
{ |
924 |
return bs->read_only;
|
925 |
} |
926 |
|
927 |
int bdrv_is_sg(BlockDriverState *bs)
|
928 |
{ |
929 |
return bs->sg;
|
930 |
} |
931 |
|
932 |
/* XXX: no longer used */
|
933 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
934 |
void (*change_cb)(void *opaque), void *opaque) |
935 |
{ |
936 |
bs->change_cb = change_cb; |
937 |
bs->change_opaque = opaque; |
938 |
} |
939 |
|
940 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
941 |
{ |
942 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
943 |
return 1; |
944 |
return bs->encrypted;
|
945 |
} |
946 |
|
947 |
int bdrv_key_required(BlockDriverState *bs)
|
948 |
{ |
949 |
BlockDriverState *backing_hd = bs->backing_hd; |
950 |
|
951 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
952 |
return 1; |
953 |
return (bs->encrypted && !bs->valid_key);
|
954 |
} |
955 |
|
956 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
957 |
{ |
958 |
int ret;
|
959 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
960 |
ret = bdrv_set_key(bs->backing_hd, key); |
961 |
if (ret < 0) |
962 |
return ret;
|
963 |
if (!bs->encrypted)
|
964 |
return 0; |
965 |
} |
966 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
967 |
return -1; |
968 |
ret = bs->drv->bdrv_set_key(bs, key); |
969 |
if (ret < 0) { |
970 |
bs->valid_key = 0;
|
971 |
} else if (!bs->valid_key) { |
972 |
bs->valid_key = 1;
|
973 |
/* call the change callback now, we skipped it on open */
|
974 |
bs->media_changed = 1;
|
975 |
if (bs->change_cb)
|
976 |
bs->change_cb(bs->change_opaque); |
977 |
} |
978 |
return ret;
|
979 |
} |
980 |
|
981 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
982 |
{ |
983 |
if (!bs->drv) {
|
984 |
buf[0] = '\0'; |
985 |
} else {
|
986 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
987 |
} |
988 |
} |
989 |
|
990 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
991 |
void *opaque)
|
992 |
{ |
993 |
BlockDriver *drv; |
994 |
|
995 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
996 |
it(opaque, drv->format_name); |
997 |
} |
998 |
} |
999 |
|
1000 |
BlockDriverState *bdrv_find(const char *name) |
1001 |
{ |
1002 |
BlockDriverState *bs; |
1003 |
|
1004 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1005 |
if (!strcmp(name, bs->device_name))
|
1006 |
return bs;
|
1007 |
} |
1008 |
return NULL; |
1009 |
} |
1010 |
|
1011 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
1012 |
{ |
1013 |
BlockDriverState *bs; |
1014 |
|
1015 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1016 |
it(opaque, bs); |
1017 |
} |
1018 |
} |
1019 |
|
1020 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
1021 |
{ |
1022 |
return bs->device_name;
|
1023 |
} |
1024 |
|
1025 |
void bdrv_flush(BlockDriverState *bs)
|
1026 |
{ |
1027 |
if (!bs->drv)
|
1028 |
return;
|
1029 |
if (bs->drv->bdrv_flush)
|
1030 |
bs->drv->bdrv_flush(bs); |
1031 |
if (bs->backing_hd)
|
1032 |
bdrv_flush(bs->backing_hd); |
1033 |
} |
1034 |
|
1035 |
void bdrv_flush_all(void) |
1036 |
{ |
1037 |
BlockDriverState *bs; |
1038 |
|
1039 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
1040 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
1041 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
1042 |
bdrv_flush(bs); |
1043 |
} |
1044 |
|
1045 |
/*
|
1046 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
1047 |
* not implementing the functionality are assumed to not support backing files,
|
1048 |
* hence all their sectors are reported as allocated.
|
1049 |
*
|
1050 |
* 'pnum' is set to the number of sectors (including and immediately following
|
1051 |
* the specified sector) that are known to be in the same
|
1052 |
* allocated/unallocated state.
|
1053 |
*
|
1054 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
1055 |
*/
|
1056 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
1057 |
int *pnum)
|
1058 |
{ |
1059 |
int64_t n; |
1060 |
if (!bs->drv->bdrv_is_allocated) {
|
1061 |
if (sector_num >= bs->total_sectors) {
|
1062 |
*pnum = 0;
|
1063 |
return 0; |
1064 |
} |
1065 |
n = bs->total_sectors - sector_num; |
1066 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
1067 |
return 1; |
1068 |
} |
1069 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
1070 |
} |
1071 |
|
1072 |
void bdrv_info(Monitor *mon)
|
1073 |
{ |
1074 |
BlockDriverState *bs; |
1075 |
|
1076 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1077 |
monitor_printf(mon, "%s:", bs->device_name);
|
1078 |
monitor_printf(mon, " type=");
|
1079 |
switch(bs->type) {
|
1080 |
case BDRV_TYPE_HD:
|
1081 |
monitor_printf(mon, "hd");
|
1082 |
break;
|
1083 |
case BDRV_TYPE_CDROM:
|
1084 |
monitor_printf(mon, "cdrom");
|
1085 |
break;
|
1086 |
case BDRV_TYPE_FLOPPY:
|
1087 |
monitor_printf(mon, "floppy");
|
1088 |
break;
|
1089 |
} |
1090 |
monitor_printf(mon, " removable=%d", bs->removable);
|
1091 |
if (bs->removable) {
|
1092 |
monitor_printf(mon, " locked=%d", bs->locked);
|
1093 |
} |
1094 |
if (bs->drv) {
|
1095 |
monitor_printf(mon, " file=");
|
1096 |
monitor_print_filename(mon, bs->filename); |
1097 |
if (bs->backing_file[0] != '\0') { |
1098 |
monitor_printf(mon, " backing_file=");
|
1099 |
monitor_print_filename(mon, bs->backing_file); |
1100 |
} |
1101 |
monitor_printf(mon, " ro=%d", bs->read_only);
|
1102 |
monitor_printf(mon, " drv=%s", bs->drv->format_name);
|
1103 |
monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
|
1104 |
} else {
|
1105 |
monitor_printf(mon, " [not inserted]");
|
1106 |
} |
1107 |
monitor_printf(mon, "\n");
|
1108 |
} |
1109 |
} |
1110 |
|
1111 |
/* The "info blockstats" command. */
|
1112 |
void bdrv_info_stats(Monitor *mon)
|
1113 |
{ |
1114 |
BlockDriverState *bs; |
1115 |
|
1116 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1117 |
monitor_printf(mon, "%s:"
|
1118 |
" rd_bytes=%" PRIu64
|
1119 |
" wr_bytes=%" PRIu64
|
1120 |
" rd_operations=%" PRIu64
|
1121 |
" wr_operations=%" PRIu64
|
1122 |
"\n",
|
1123 |
bs->device_name, |
1124 |
bs->rd_bytes, bs->wr_bytes, |
1125 |
bs->rd_ops, bs->wr_ops); |
1126 |
} |
1127 |
} |
1128 |
|
1129 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1130 |
{ |
1131 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
1132 |
return bs->backing_file;
|
1133 |
else if (bs->encrypted) |
1134 |
return bs->filename;
|
1135 |
else
|
1136 |
return NULL; |
1137 |
} |
1138 |
|
1139 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
1140 |
char *filename, int filename_size) |
1141 |
{ |
1142 |
if (!bs->backing_hd) {
|
1143 |
pstrcpy(filename, filename_size, "");
|
1144 |
} else {
|
1145 |
pstrcpy(filename, filename_size, bs->backing_file); |
1146 |
} |
1147 |
} |
1148 |
|
1149 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
1150 |
const uint8_t *buf, int nb_sectors) |
1151 |
{ |
1152 |
BlockDriver *drv = bs->drv; |
1153 |
if (!drv)
|
1154 |
return -ENOMEDIUM;
|
1155 |
if (!drv->bdrv_write_compressed)
|
1156 |
return -ENOTSUP;
|
1157 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1158 |
return -EIO;
|
1159 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
1160 |
} |
1161 |
|
1162 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
1163 |
{ |
1164 |
BlockDriver *drv = bs->drv; |
1165 |
if (!drv)
|
1166 |
return -ENOMEDIUM;
|
1167 |
if (!drv->bdrv_get_info)
|
1168 |
return -ENOTSUP;
|
1169 |
memset(bdi, 0, sizeof(*bdi)); |
1170 |
return drv->bdrv_get_info(bs, bdi);
|
1171 |
} |
1172 |
|
1173 |
int bdrv_put_buffer(BlockDriverState *bs, const uint8_t *buf, int64_t pos, int size) |
1174 |
{ |
1175 |
BlockDriver *drv = bs->drv; |
1176 |
if (!drv)
|
1177 |
return -ENOMEDIUM;
|
1178 |
if (!drv->bdrv_put_buffer)
|
1179 |
return -ENOTSUP;
|
1180 |
return drv->bdrv_put_buffer(bs, buf, pos, size);
|
1181 |
} |
1182 |
|
1183 |
int bdrv_get_buffer(BlockDriverState *bs, uint8_t *buf, int64_t pos, int size) |
1184 |
{ |
1185 |
BlockDriver *drv = bs->drv; |
1186 |
if (!drv)
|
1187 |
return -ENOMEDIUM;
|
1188 |
if (!drv->bdrv_get_buffer)
|
1189 |
return -ENOTSUP;
|
1190 |
return drv->bdrv_get_buffer(bs, buf, pos, size);
|
1191 |
} |
1192 |
|
1193 |
/**************************************************************/
|
1194 |
/* handling of snapshots */
|
1195 |
|
1196 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
1197 |
QEMUSnapshotInfo *sn_info) |
1198 |
{ |
1199 |
BlockDriver *drv = bs->drv; |
1200 |
if (!drv)
|
1201 |
return -ENOMEDIUM;
|
1202 |
if (!drv->bdrv_snapshot_create)
|
1203 |
return -ENOTSUP;
|
1204 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
1205 |
} |
1206 |
|
1207 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
1208 |
const char *snapshot_id) |
1209 |
{ |
1210 |
BlockDriver *drv = bs->drv; |
1211 |
if (!drv)
|
1212 |
return -ENOMEDIUM;
|
1213 |
if (!drv->bdrv_snapshot_goto)
|
1214 |
return -ENOTSUP;
|
1215 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
1216 |
} |
1217 |
|
1218 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
1219 |
{ |
1220 |
BlockDriver *drv = bs->drv; |
1221 |
if (!drv)
|
1222 |
return -ENOMEDIUM;
|
1223 |
if (!drv->bdrv_snapshot_delete)
|
1224 |
return -ENOTSUP;
|
1225 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
1226 |
} |
1227 |
|
1228 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
1229 |
QEMUSnapshotInfo **psn_info) |
1230 |
{ |
1231 |
BlockDriver *drv = bs->drv; |
1232 |
if (!drv)
|
1233 |
return -ENOMEDIUM;
|
1234 |
if (!drv->bdrv_snapshot_list)
|
1235 |
return -ENOTSUP;
|
1236 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
1237 |
} |
1238 |
|
1239 |
#define NB_SUFFIXES 4 |
1240 |
|
1241 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
1242 |
{ |
1243 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
1244 |
int64_t base; |
1245 |
int i;
|
1246 |
|
1247 |
if (size <= 999) { |
1248 |
snprintf(buf, buf_size, "%" PRId64, size);
|
1249 |
} else {
|
1250 |
base = 1024;
|
1251 |
for(i = 0; i < NB_SUFFIXES; i++) { |
1252 |
if (size < (10 * base)) { |
1253 |
snprintf(buf, buf_size, "%0.1f%c",
|
1254 |
(double)size / base,
|
1255 |
suffixes[i]); |
1256 |
break;
|
1257 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
1258 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
1259 |
((size + (base >> 1)) / base),
|
1260 |
suffixes[i]); |
1261 |
break;
|
1262 |
} |
1263 |
base = base * 1024;
|
1264 |
} |
1265 |
} |
1266 |
return buf;
|
1267 |
} |
1268 |
|
1269 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
1270 |
{ |
1271 |
char buf1[128], date_buf[128], clock_buf[128]; |
1272 |
#ifdef _WIN32
|
1273 |
struct tm *ptm;
|
1274 |
#else
|
1275 |
struct tm tm;
|
1276 |
#endif
|
1277 |
time_t ti; |
1278 |
int64_t secs; |
1279 |
|
1280 |
if (!sn) {
|
1281 |
snprintf(buf, buf_size, |
1282 |
"%-10s%-20s%7s%20s%15s",
|
1283 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1284 |
} else {
|
1285 |
ti = sn->date_sec; |
1286 |
#ifdef _WIN32
|
1287 |
ptm = localtime(&ti); |
1288 |
strftime(date_buf, sizeof(date_buf),
|
1289 |
"%Y-%m-%d %H:%M:%S", ptm);
|
1290 |
#else
|
1291 |
localtime_r(&ti, &tm); |
1292 |
strftime(date_buf, sizeof(date_buf),
|
1293 |
"%Y-%m-%d %H:%M:%S", &tm);
|
1294 |
#endif
|
1295 |
secs = sn->vm_clock_nsec / 1000000000;
|
1296 |
snprintf(clock_buf, sizeof(clock_buf),
|
1297 |
"%02d:%02d:%02d.%03d",
|
1298 |
(int)(secs / 3600), |
1299 |
(int)((secs / 60) % 60), |
1300 |
(int)(secs % 60), |
1301 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1302 |
snprintf(buf, buf_size, |
1303 |
"%-10s%-20s%7s%20s%15s",
|
1304 |
sn->id_str, sn->name, |
1305 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1306 |
date_buf, |
1307 |
clock_buf); |
1308 |
} |
1309 |
return buf;
|
1310 |
} |
1311 |
|
1312 |
|
1313 |
/**************************************************************/
|
1314 |
/* async I/Os */
|
1315 |
|
1316 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
1317 |
QEMUIOVector *qiov, int nb_sectors,
|
1318 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1319 |
{ |
1320 |
BlockDriver *drv = bs->drv; |
1321 |
BlockDriverAIOCB *ret; |
1322 |
|
1323 |
if (!drv)
|
1324 |
return NULL; |
1325 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1326 |
return NULL; |
1327 |
|
1328 |
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1329 |
cb, opaque); |
1330 |
|
1331 |
if (ret) {
|
1332 |
/* Update stats even though technically transfer has not happened. */
|
1333 |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1334 |
bs->rd_ops ++; |
1335 |
} |
1336 |
|
1337 |
return ret;
|
1338 |
} |
1339 |
|
1340 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1341 |
QEMUIOVector *qiov, int nb_sectors,
|
1342 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1343 |
{ |
1344 |
BlockDriver *drv = bs->drv; |
1345 |
BlockDriverAIOCB *ret; |
1346 |
|
1347 |
if (!drv)
|
1348 |
return NULL; |
1349 |
if (bs->read_only)
|
1350 |
return NULL; |
1351 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1352 |
return NULL; |
1353 |
|
1354 |
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1355 |
cb, opaque); |
1356 |
|
1357 |
if (ret) {
|
1358 |
/* Update stats even though technically transfer has not happened. */
|
1359 |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1360 |
bs->wr_ops ++; |
1361 |
} |
1362 |
|
1363 |
return ret;
|
1364 |
} |
1365 |
|
1366 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
1367 |
{ |
1368 |
acb->pool->cancel(acb); |
1369 |
} |
1370 |
|
1371 |
|
1372 |
/**************************************************************/
|
1373 |
/* async block device emulation */
|
1374 |
|
1375 |
static void bdrv_aio_bh_cb(void *opaque) |
1376 |
{ |
1377 |
BlockDriverAIOCBSync *acb = opaque; |
1378 |
|
1379 |
if (!acb->is_write)
|
1380 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
1381 |
qemu_vfree(acb->bounce); |
1382 |
acb->common.cb(acb->common.opaque, acb->ret); |
1383 |
|
1384 |
qemu_aio_release(acb); |
1385 |
} |
1386 |
|
1387 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
1388 |
int64_t sector_num, |
1389 |
QEMUIOVector *qiov, |
1390 |
int nb_sectors,
|
1391 |
BlockDriverCompletionFunc *cb, |
1392 |
void *opaque,
|
1393 |
int is_write)
|
1394 |
|
1395 |
{ |
1396 |
BlockDriverAIOCBSync *acb; |
1397 |
|
1398 |
acb = qemu_aio_get(bs, cb, opaque); |
1399 |
acb->is_write = is_write; |
1400 |
acb->qiov = qiov; |
1401 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
1402 |
|
1403 |
if (!acb->bh)
|
1404 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1405 |
|
1406 |
if (is_write) {
|
1407 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
1408 |
acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
1409 |
} else {
|
1410 |
acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
1411 |
} |
1412 |
|
1413 |
qemu_bh_schedule(acb->bh); |
1414 |
|
1415 |
return &acb->common;
|
1416 |
} |
1417 |
|
1418 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
1419 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
1420 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1421 |
{ |
1422 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
1423 |
} |
1424 |
|
1425 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
1426 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
1427 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1428 |
{ |
1429 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
1430 |
} |
1431 |
|
1432 |
|
1433 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
1434 |
{ |
1435 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1436 |
qemu_bh_cancel(acb->bh); |
1437 |
qemu_aio_release(acb); |
1438 |
} |
1439 |
|
1440 |
/**************************************************************/
|
1441 |
/* sync block device emulation */
|
1442 |
|
1443 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
1444 |
{ |
1445 |
*(int *)opaque = ret;
|
1446 |
} |
1447 |
|
1448 |
#define NOT_DONE 0x7fffffff |
1449 |
|
1450 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
1451 |
uint8_t *buf, int nb_sectors)
|
1452 |
{ |
1453 |
int async_ret;
|
1454 |
BlockDriverAIOCB *acb; |
1455 |
struct iovec iov;
|
1456 |
QEMUIOVector qiov; |
1457 |
|
1458 |
async_ret = NOT_DONE; |
1459 |
iov.iov_base = (void *)buf;
|
1460 |
iov.iov_len = nb_sectors * 512;
|
1461 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
1462 |
acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
1463 |
bdrv_rw_em_cb, &async_ret); |
1464 |
if (acb == NULL) |
1465 |
return -1; |
1466 |
|
1467 |
while (async_ret == NOT_DONE) {
|
1468 |
qemu_aio_wait(); |
1469 |
} |
1470 |
|
1471 |
return async_ret;
|
1472 |
} |
1473 |
|
1474 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1475 |
const uint8_t *buf, int nb_sectors) |
1476 |
{ |
1477 |
int async_ret;
|
1478 |
BlockDriverAIOCB *acb; |
1479 |
struct iovec iov;
|
1480 |
QEMUIOVector qiov; |
1481 |
|
1482 |
async_ret = NOT_DONE; |
1483 |
iov.iov_base = (void *)buf;
|
1484 |
iov.iov_len = nb_sectors * 512;
|
1485 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
1486 |
acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
1487 |
bdrv_rw_em_cb, &async_ret); |
1488 |
if (acb == NULL) |
1489 |
return -1; |
1490 |
while (async_ret == NOT_DONE) {
|
1491 |
qemu_aio_wait(); |
1492 |
} |
1493 |
return async_ret;
|
1494 |
} |
1495 |
|
1496 |
void bdrv_init(void) |
1497 |
{ |
1498 |
module_call_init(MODULE_INIT_BLOCK); |
1499 |
} |
1500 |
|
1501 |
void aio_pool_init(AIOPool *pool, int aiocb_size, |
1502 |
void (*cancel)(BlockDriverAIOCB *acb))
|
1503 |
{ |
1504 |
pool->aiocb_size = aiocb_size; |
1505 |
pool->cancel = cancel; |
1506 |
pool->free_aiocb = NULL;
|
1507 |
} |
1508 |
|
1509 |
void *qemu_aio_get_pool(AIOPool *pool, BlockDriverState *bs,
|
1510 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1511 |
{ |
1512 |
BlockDriverAIOCB *acb; |
1513 |
|
1514 |
if (pool->free_aiocb) {
|
1515 |
acb = pool->free_aiocb; |
1516 |
pool->free_aiocb = acb->next; |
1517 |
} else {
|
1518 |
acb = qemu_mallocz(pool->aiocb_size); |
1519 |
acb->pool = pool; |
1520 |
} |
1521 |
acb->bs = bs; |
1522 |
acb->cb = cb; |
1523 |
acb->opaque = opaque; |
1524 |
return acb;
|
1525 |
} |
1526 |
|
1527 |
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
|
1528 |
void *opaque)
|
1529 |
{ |
1530 |
return qemu_aio_get_pool(&bs->drv->aio_pool, bs, cb, opaque);
|
1531 |
} |
1532 |
|
1533 |
void qemu_aio_release(void *p) |
1534 |
{ |
1535 |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
1536 |
AIOPool *pool = acb->pool; |
1537 |
acb->next = pool->free_aiocb; |
1538 |
pool->free_aiocb = acb; |
1539 |
} |
1540 |
|
1541 |
/**************************************************************/
|
1542 |
/* removable device support */
|
1543 |
|
1544 |
/**
|
1545 |
* Return TRUE if the media is present
|
1546 |
*/
|
1547 |
int bdrv_is_inserted(BlockDriverState *bs)
|
1548 |
{ |
1549 |
BlockDriver *drv = bs->drv; |
1550 |
int ret;
|
1551 |
if (!drv)
|
1552 |
return 0; |
1553 |
if (!drv->bdrv_is_inserted)
|
1554 |
return 1; |
1555 |
ret = drv->bdrv_is_inserted(bs); |
1556 |
return ret;
|
1557 |
} |
1558 |
|
1559 |
/**
|
1560 |
* Return TRUE if the media changed since the last call to this
|
1561 |
* function. It is currently only used for floppy disks
|
1562 |
*/
|
1563 |
int bdrv_media_changed(BlockDriverState *bs)
|
1564 |
{ |
1565 |
BlockDriver *drv = bs->drv; |
1566 |
int ret;
|
1567 |
|
1568 |
if (!drv || !drv->bdrv_media_changed)
|
1569 |
ret = -ENOTSUP; |
1570 |
else
|
1571 |
ret = drv->bdrv_media_changed(bs); |
1572 |
if (ret == -ENOTSUP)
|
1573 |
ret = bs->media_changed; |
1574 |
bs->media_changed = 0;
|
1575 |
return ret;
|
1576 |
} |
1577 |
|
1578 |
/**
|
1579 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
1580 |
*/
|
1581 |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
1582 |
{ |
1583 |
BlockDriver *drv = bs->drv; |
1584 |
int ret;
|
1585 |
|
1586 |
if (!drv || !drv->bdrv_eject) {
|
1587 |
ret = -ENOTSUP; |
1588 |
} else {
|
1589 |
ret = drv->bdrv_eject(bs, eject_flag); |
1590 |
} |
1591 |
if (ret == -ENOTSUP) {
|
1592 |
if (eject_flag)
|
1593 |
bdrv_close(bs); |
1594 |
} |
1595 |
} |
1596 |
|
1597 |
int bdrv_is_locked(BlockDriverState *bs)
|
1598 |
{ |
1599 |
return bs->locked;
|
1600 |
} |
1601 |
|
1602 |
/**
|
1603 |
* Lock or unlock the media (if it is locked, the user won't be able
|
1604 |
* to eject it manually).
|
1605 |
*/
|
1606 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
1607 |
{ |
1608 |
BlockDriver *drv = bs->drv; |
1609 |
|
1610 |
bs->locked = locked; |
1611 |
if (drv && drv->bdrv_set_locked) {
|
1612 |
drv->bdrv_set_locked(bs, locked); |
1613 |
} |
1614 |
} |
1615 |
|
1616 |
/* needed for generic scsi interface */
|
1617 |
|
1618 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
1619 |
{ |
1620 |
BlockDriver *drv = bs->drv; |
1621 |
|
1622 |
if (drv && drv->bdrv_ioctl)
|
1623 |
return drv->bdrv_ioctl(bs, req, buf);
|
1624 |
return -ENOTSUP;
|
1625 |
} |
1626 |
|
1627 |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
1628 |
unsigned long int req, void *buf, |
1629 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1630 |
{ |
1631 |
BlockDriver *drv = bs->drv; |
1632 |
|
1633 |
if (drv && drv->bdrv_aio_ioctl)
|
1634 |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
1635 |
return NULL; |
1636 |
} |
1637 |
|
1638 |
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
1639 |
{ |
1640 |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
1641 |
} |