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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 _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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#include "qemu-common.h" |
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#include "console.h" |
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#include "block_int.h" |
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#ifdef _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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#include <sys/disk.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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|
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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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} BlockDriverAIOCBSync; |
49 |
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static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
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int64_t sector_num, uint8_t *buf, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
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int64_t sector_num, const uint8_t *buf, 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); |
61 |
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BlockDriverState *bdrv_first; |
63 |
|
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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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} |
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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++; |
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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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|
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|
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static void bdrv_register(BlockDriver *bdrv) |
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{ |
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if (!bdrv->bdrv_aio_read) {
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/* add AIO emulation layer */
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bdrv->bdrv_aio_read = bdrv_aio_read_em; |
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bdrv->bdrv_aio_write = bdrv_aio_write_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 && !bdrv->bdrv_pread) { |
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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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bdrv->next = first_drv; |
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first_drv = bdrv; |
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} |
147 |
|
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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_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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#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] == ':'); |
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} |
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static int is_windows_drive(const char *filename) |
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{ |
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if (is_windows_drive_prefix(filename) &&
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filename[2] == '\0') |
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return 1; |
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if (strstart(filename, "\\\\.\\", NULL) || |
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strstart(filename, "//./", NULL)) |
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return 1; |
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return 0; |
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} |
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#endif
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static BlockDriver *find_protocol(const char *filename) |
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{ |
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BlockDriver *drv1; |
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char protocol[128]; |
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int len;
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const char *p; |
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#ifdef _WIN32
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if (is_windows_drive(filename) ||
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is_windows_drive_prefix(filename)) |
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return &bdrv_raw;
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#endif
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p = strchr(filename, ':');
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if (!p)
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return &bdrv_raw;
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len = p - filename; |
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if (len > sizeof(protocol) - 1) |
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len = sizeof(protocol) - 1; |
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memcpy(protocol, filename, len); |
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protocol[len] = '\0';
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
248 |
if (drv1->protocol_name &&
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!strcmp(drv1->protocol_name, protocol)) |
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return drv1;
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} |
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return NULL; |
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} |
254 |
|
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/* 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) |
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{ |
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int ret, score, score_max;
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BlockDriver *drv1, *drv; |
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uint8_t buf[2048];
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BlockDriverState *bs; |
263 |
|
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/* detect host devices. By convention, /dev/cdrom[N] is always
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recognized as a host CDROM */
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if (strstart(filename, "/dev/cdrom", NULL)) |
267 |
return &bdrv_host_device;
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#ifdef _WIN32
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if (is_windows_drive(filename))
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return &bdrv_host_device;
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#else
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{ |
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struct stat st;
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if (stat(filename, &st) >= 0 && |
275 |
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
276 |
return &bdrv_host_device;
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} |
278 |
} |
279 |
#endif
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280 |
|
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drv = find_protocol(filename); |
282 |
/* no need to test disk image formats for vvfat */
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if (drv == &bdrv_vvfat)
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return drv;
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|
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ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
287 |
if (ret < 0) |
288 |
return NULL; |
289 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
290 |
bdrv_delete(bs); |
291 |
if (ret < 0) { |
292 |
return NULL; |
293 |
} |
294 |
|
295 |
score_max = 0;
|
296 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
297 |
if (drv1->bdrv_probe) {
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298 |
score = drv1->bdrv_probe(buf, ret, filename); |
299 |
if (score > score_max) {
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300 |
score_max = score; |
301 |
drv = drv1; |
302 |
} |
303 |
} |
304 |
} |
305 |
return drv;
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306 |
} |
307 |
|
308 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
309 |
{ |
310 |
BlockDriverState *bs; |
311 |
int ret;
|
312 |
|
313 |
bs = bdrv_new("");
|
314 |
if (!bs)
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315 |
return -ENOMEM;
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316 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
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317 |
if (ret < 0) { |
318 |
bdrv_delete(bs); |
319 |
return ret;
|
320 |
} |
321 |
*pbs = bs; |
322 |
return 0; |
323 |
} |
324 |
|
325 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
326 |
{ |
327 |
return bdrv_open2(bs, filename, flags, NULL); |
328 |
} |
329 |
|
330 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
331 |
BlockDriver *drv) |
332 |
{ |
333 |
int ret, open_flags;
|
334 |
char tmp_filename[PATH_MAX];
|
335 |
char backing_filename[PATH_MAX];
|
336 |
|
337 |
bs->read_only = 0;
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338 |
bs->is_temporary = 0;
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339 |
bs->encrypted = 0;
|
340 |
|
341 |
if (flags & BDRV_O_SNAPSHOT) {
|
342 |
BlockDriverState *bs1; |
343 |
int64_t total_size; |
344 |
int is_protocol = 0; |
345 |
|
346 |
/* if snapshot, we create a temporary backing file and open it
|
347 |
instead of opening 'filename' directly */
|
348 |
|
349 |
/* if there is a backing file, use it */
|
350 |
bs1 = bdrv_new("");
|
351 |
if (!bs1) {
|
352 |
return -ENOMEM;
|
353 |
} |
354 |
if (bdrv_open(bs1, filename, 0) < 0) { |
355 |
bdrv_delete(bs1); |
356 |
return -1; |
357 |
} |
358 |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
359 |
|
360 |
if (bs1->drv && bs1->drv->protocol_name)
|
361 |
is_protocol = 1;
|
362 |
|
363 |
bdrv_delete(bs1); |
364 |
|
365 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
366 |
|
367 |
/* Real path is meaningless for protocols */
|
368 |
if (is_protocol)
|
369 |
snprintf(backing_filename, sizeof(backing_filename),
|
370 |
"%s", filename);
|
371 |
else
|
372 |
realpath(filename, backing_filename); |
373 |
|
374 |
if (bdrv_create(&bdrv_qcow2, tmp_filename,
|
375 |
total_size, backing_filename, 0) < 0) { |
376 |
return -1; |
377 |
} |
378 |
filename = tmp_filename; |
379 |
bs->is_temporary = 1;
|
380 |
} |
381 |
|
382 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
383 |
if (flags & BDRV_O_FILE) {
|
384 |
drv = find_protocol(filename); |
385 |
if (!drv)
|
386 |
return -ENOENT;
|
387 |
} else {
|
388 |
if (!drv) {
|
389 |
drv = find_image_format(filename); |
390 |
if (!drv)
|
391 |
return -1; |
392 |
} |
393 |
} |
394 |
bs->drv = drv; |
395 |
bs->opaque = qemu_mallocz(drv->instance_size); |
396 |
/* Note: for compatibility, we open disk image files as RDWR, and
|
397 |
RDONLY as fallback */
|
398 |
if (!(flags & BDRV_O_FILE))
|
399 |
open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK); |
400 |
else
|
401 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
402 |
ret = drv->bdrv_open(bs, filename, open_flags); |
403 |
if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
|
404 |
ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
405 |
bs->read_only = 1;
|
406 |
} |
407 |
if (ret < 0) { |
408 |
qemu_free(bs->opaque); |
409 |
bs->opaque = NULL;
|
410 |
bs->drv = NULL;
|
411 |
return ret;
|
412 |
} |
413 |
if (drv->bdrv_getlength) {
|
414 |
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
415 |
} |
416 |
#ifndef _WIN32
|
417 |
if (bs->is_temporary) {
|
418 |
unlink(filename); |
419 |
} |
420 |
#endif
|
421 |
if (bs->backing_file[0] != '\0') { |
422 |
/* if there is a backing file, use it */
|
423 |
bs->backing_hd = bdrv_new("");
|
424 |
if (!bs->backing_hd) {
|
425 |
fail:
|
426 |
bdrv_close(bs); |
427 |
return -ENOMEM;
|
428 |
} |
429 |
path_combine(backing_filename, sizeof(backing_filename),
|
430 |
filename, bs->backing_file); |
431 |
if (bdrv_open(bs->backing_hd, backing_filename, open_flags) < 0) |
432 |
goto fail;
|
433 |
} |
434 |
|
435 |
/* call the change callback */
|
436 |
bs->media_changed = 1;
|
437 |
if (bs->change_cb)
|
438 |
bs->change_cb(bs->change_opaque); |
439 |
|
440 |
return 0; |
441 |
} |
442 |
|
443 |
void bdrv_close(BlockDriverState *bs)
|
444 |
{ |
445 |
if (bs->drv) {
|
446 |
if (bs->backing_hd)
|
447 |
bdrv_delete(bs->backing_hd); |
448 |
bs->drv->bdrv_close(bs); |
449 |
qemu_free(bs->opaque); |
450 |
#ifdef _WIN32
|
451 |
if (bs->is_temporary) {
|
452 |
unlink(bs->filename); |
453 |
} |
454 |
#endif
|
455 |
bs->opaque = NULL;
|
456 |
bs->drv = NULL;
|
457 |
|
458 |
/* call the change callback */
|
459 |
bs->media_changed = 1;
|
460 |
if (bs->change_cb)
|
461 |
bs->change_cb(bs->change_opaque); |
462 |
} |
463 |
} |
464 |
|
465 |
void bdrv_delete(BlockDriverState *bs)
|
466 |
{ |
467 |
BlockDriverState **pbs; |
468 |
|
469 |
pbs = &bdrv_first; |
470 |
while (*pbs != bs && *pbs != NULL) |
471 |
pbs = &(*pbs)->next; |
472 |
if (*pbs == bs)
|
473 |
*pbs = bs->next; |
474 |
|
475 |
bdrv_close(bs); |
476 |
qemu_free(bs); |
477 |
} |
478 |
|
479 |
/* commit COW file into the raw image */
|
480 |
int bdrv_commit(BlockDriverState *bs)
|
481 |
{ |
482 |
BlockDriver *drv = bs->drv; |
483 |
int64_t i, total_sectors; |
484 |
int n, j;
|
485 |
unsigned char sector[512]; |
486 |
|
487 |
if (!drv)
|
488 |
return -ENOMEDIUM;
|
489 |
|
490 |
if (bs->read_only) {
|
491 |
return -EACCES;
|
492 |
} |
493 |
|
494 |
if (!bs->backing_hd) {
|
495 |
return -ENOTSUP;
|
496 |
} |
497 |
|
498 |
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
499 |
for (i = 0; i < total_sectors;) { |
500 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
501 |
for(j = 0; j < n; j++) { |
502 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
503 |
return -EIO;
|
504 |
} |
505 |
|
506 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
507 |
return -EIO;
|
508 |
} |
509 |
i++; |
510 |
} |
511 |
} else {
|
512 |
i += n; |
513 |
} |
514 |
} |
515 |
|
516 |
if (drv->bdrv_make_empty)
|
517 |
return drv->bdrv_make_empty(bs);
|
518 |
|
519 |
return 0; |
520 |
} |
521 |
|
522 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
523 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
524 |
uint8_t *buf, int nb_sectors)
|
525 |
{ |
526 |
BlockDriver *drv = bs->drv; |
527 |
|
528 |
if (!drv)
|
529 |
return -ENOMEDIUM;
|
530 |
|
531 |
if (drv->bdrv_pread) {
|
532 |
int ret, len;
|
533 |
len = nb_sectors * 512;
|
534 |
ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
|
535 |
if (ret < 0) |
536 |
return ret;
|
537 |
else if (ret != len) |
538 |
return -EINVAL;
|
539 |
else {
|
540 |
bs->rd_bytes += (unsigned) len;
|
541 |
bs->rd_ops ++; |
542 |
return 0; |
543 |
} |
544 |
} else {
|
545 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
546 |
} |
547 |
} |
548 |
|
549 |
/* Return < 0 if error. Important errors are:
|
550 |
-EIO generic I/O error (may happen for all errors)
|
551 |
-ENOMEDIUM No media inserted.
|
552 |
-EINVAL Invalid sector number or nb_sectors
|
553 |
-EACCES Trying to write a read-only device
|
554 |
*/
|
555 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
556 |
const uint8_t *buf, int nb_sectors) |
557 |
{ |
558 |
BlockDriver *drv = bs->drv; |
559 |
if (!bs->drv)
|
560 |
return -ENOMEDIUM;
|
561 |
if (bs->read_only)
|
562 |
return -EACCES;
|
563 |
if (drv->bdrv_pwrite) {
|
564 |
int ret, len, count = 0; |
565 |
len = nb_sectors * 512;
|
566 |
do {
|
567 |
ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len - count);
|
568 |
if (ret < 0) { |
569 |
printf("bdrv_write ret=%d\n", ret);
|
570 |
return ret;
|
571 |
} |
572 |
count += ret; |
573 |
buf += ret; |
574 |
} while (count != len);
|
575 |
bs->wr_bytes += (unsigned) len;
|
576 |
bs->wr_ops ++; |
577 |
return 0; |
578 |
} |
579 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
580 |
} |
581 |
|
582 |
static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
583 |
uint8_t *buf, int count1)
|
584 |
{ |
585 |
uint8_t tmp_buf[SECTOR_SIZE]; |
586 |
int len, nb_sectors, count;
|
587 |
int64_t sector_num; |
588 |
|
589 |
count = count1; |
590 |
/* first read to align to sector start */
|
591 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
592 |
if (len > count)
|
593 |
len = count; |
594 |
sector_num = offset >> SECTOR_BITS; |
595 |
if (len > 0) { |
596 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
597 |
return -EIO;
|
598 |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
599 |
count -= len; |
600 |
if (count == 0) |
601 |
return count1;
|
602 |
sector_num++; |
603 |
buf += len; |
604 |
} |
605 |
|
606 |
/* read the sectors "in place" */
|
607 |
nb_sectors = count >> SECTOR_BITS; |
608 |
if (nb_sectors > 0) { |
609 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
610 |
return -EIO;
|
611 |
sector_num += nb_sectors; |
612 |
len = nb_sectors << SECTOR_BITS; |
613 |
buf += len; |
614 |
count -= len; |
615 |
} |
616 |
|
617 |
/* add data from the last sector */
|
618 |
if (count > 0) { |
619 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
620 |
return -EIO;
|
621 |
memcpy(buf, tmp_buf, count); |
622 |
} |
623 |
return count1;
|
624 |
} |
625 |
|
626 |
static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
627 |
const uint8_t *buf, int count1) |
628 |
{ |
629 |
uint8_t tmp_buf[SECTOR_SIZE]; |
630 |
int len, nb_sectors, count;
|
631 |
int64_t sector_num; |
632 |
|
633 |
count = count1; |
634 |
/* first write to align to sector start */
|
635 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
636 |
if (len > count)
|
637 |
len = count; |
638 |
sector_num = offset >> SECTOR_BITS; |
639 |
if (len > 0) { |
640 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
641 |
return -EIO;
|
642 |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
643 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
644 |
return -EIO;
|
645 |
count -= len; |
646 |
if (count == 0) |
647 |
return count1;
|
648 |
sector_num++; |
649 |
buf += len; |
650 |
} |
651 |
|
652 |
/* write the sectors "in place" */
|
653 |
nb_sectors = count >> SECTOR_BITS; |
654 |
if (nb_sectors > 0) { |
655 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
656 |
return -EIO;
|
657 |
sector_num += nb_sectors; |
658 |
len = nb_sectors << SECTOR_BITS; |
659 |
buf += len; |
660 |
count -= len; |
661 |
} |
662 |
|
663 |
/* add data from the last sector */
|
664 |
if (count > 0) { |
665 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
666 |
return -EIO;
|
667 |
memcpy(tmp_buf, buf, count); |
668 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
669 |
return -EIO;
|
670 |
} |
671 |
return count1;
|
672 |
} |
673 |
|
674 |
/**
|
675 |
* Read with byte offsets (needed only for file protocols)
|
676 |
*/
|
677 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
678 |
void *buf1, int count1) |
679 |
{ |
680 |
BlockDriver *drv = bs->drv; |
681 |
|
682 |
if (!drv)
|
683 |
return -ENOMEDIUM;
|
684 |
if (!drv->bdrv_pread)
|
685 |
return bdrv_pread_em(bs, offset, buf1, count1);
|
686 |
return drv->bdrv_pread(bs, offset, buf1, count1);
|
687 |
} |
688 |
|
689 |
/**
|
690 |
* Write with byte offsets (needed only for file protocols)
|
691 |
*/
|
692 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
693 |
const void *buf1, int count1) |
694 |
{ |
695 |
BlockDriver *drv = bs->drv; |
696 |
|
697 |
if (!drv)
|
698 |
return -ENOMEDIUM;
|
699 |
if (!drv->bdrv_pwrite)
|
700 |
return bdrv_pwrite_em(bs, offset, buf1, count1);
|
701 |
return drv->bdrv_pwrite(bs, offset, buf1, count1);
|
702 |
} |
703 |
|
704 |
/**
|
705 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
706 |
*/
|
707 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
708 |
{ |
709 |
BlockDriver *drv = bs->drv; |
710 |
if (!drv)
|
711 |
return -ENOMEDIUM;
|
712 |
if (!drv->bdrv_truncate)
|
713 |
return -ENOTSUP;
|
714 |
return drv->bdrv_truncate(bs, offset);
|
715 |
} |
716 |
|
717 |
/**
|
718 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
719 |
*/
|
720 |
int64_t bdrv_getlength(BlockDriverState *bs) |
721 |
{ |
722 |
BlockDriver *drv = bs->drv; |
723 |
if (!drv)
|
724 |
return -ENOMEDIUM;
|
725 |
if (!drv->bdrv_getlength) {
|
726 |
/* legacy mode */
|
727 |
return bs->total_sectors * SECTOR_SIZE;
|
728 |
} |
729 |
return drv->bdrv_getlength(bs);
|
730 |
} |
731 |
|
732 |
/* return 0 as number of sectors if no device present or error */
|
733 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
734 |
{ |
735 |
int64_t length; |
736 |
length = bdrv_getlength(bs); |
737 |
if (length < 0) |
738 |
length = 0;
|
739 |
else
|
740 |
length = length >> SECTOR_BITS; |
741 |
*nb_sectors_ptr = length; |
742 |
} |
743 |
|
744 |
struct partition {
|
745 |
uint8_t boot_ind; /* 0x80 - active */
|
746 |
uint8_t head; /* starting head */
|
747 |
uint8_t sector; /* starting sector */
|
748 |
uint8_t cyl; /* starting cylinder */
|
749 |
uint8_t sys_ind; /* What partition type */
|
750 |
uint8_t end_head; /* end head */
|
751 |
uint8_t end_sector; /* end sector */
|
752 |
uint8_t end_cyl; /* end cylinder */
|
753 |
uint32_t start_sect; /* starting sector counting from 0 */
|
754 |
uint32_t nr_sects; /* nr of sectors in partition */
|
755 |
} __attribute__((packed)); |
756 |
|
757 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
758 |
static int guess_disk_lchs(BlockDriverState *bs, |
759 |
int *pcylinders, int *pheads, int *psectors) |
760 |
{ |
761 |
uint8_t buf[512];
|
762 |
int ret, i, heads, sectors, cylinders;
|
763 |
struct partition *p;
|
764 |
uint32_t nr_sects; |
765 |
uint64_t nb_sectors; |
766 |
|
767 |
bdrv_get_geometry(bs, &nb_sectors); |
768 |
|
769 |
ret = bdrv_read(bs, 0, buf, 1); |
770 |
if (ret < 0) |
771 |
return -1; |
772 |
/* test msdos magic */
|
773 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
774 |
return -1; |
775 |
for(i = 0; i < 4; i++) { |
776 |
p = ((struct partition *)(buf + 0x1be)) + i; |
777 |
nr_sects = le32_to_cpu(p->nr_sects); |
778 |
if (nr_sects && p->end_head) {
|
779 |
/* We make the assumption that the partition terminates on
|
780 |
a cylinder boundary */
|
781 |
heads = p->end_head + 1;
|
782 |
sectors = p->end_sector & 63;
|
783 |
if (sectors == 0) |
784 |
continue;
|
785 |
cylinders = nb_sectors / (heads * sectors); |
786 |
if (cylinders < 1 || cylinders > 16383) |
787 |
continue;
|
788 |
*pheads = heads; |
789 |
*psectors = sectors; |
790 |
*pcylinders = cylinders; |
791 |
#if 0
|
792 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
793 |
cylinders, heads, sectors);
|
794 |
#endif
|
795 |
return 0; |
796 |
} |
797 |
} |
798 |
return -1; |
799 |
} |
800 |
|
801 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
802 |
{ |
803 |
int translation, lba_detected = 0; |
804 |
int cylinders, heads, secs;
|
805 |
uint64_t nb_sectors; |
806 |
|
807 |
/* if a geometry hint is available, use it */
|
808 |
bdrv_get_geometry(bs, &nb_sectors); |
809 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
810 |
translation = bdrv_get_translation_hint(bs); |
811 |
if (cylinders != 0) { |
812 |
*pcyls = cylinders; |
813 |
*pheads = heads; |
814 |
*psecs = secs; |
815 |
} else {
|
816 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
817 |
if (heads > 16) { |
818 |
/* if heads > 16, it means that a BIOS LBA
|
819 |
translation was active, so the default
|
820 |
hardware geometry is OK */
|
821 |
lba_detected = 1;
|
822 |
goto default_geometry;
|
823 |
} else {
|
824 |
*pcyls = cylinders; |
825 |
*pheads = heads; |
826 |
*psecs = secs; |
827 |
/* disable any translation to be in sync with
|
828 |
the logical geometry */
|
829 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
830 |
bdrv_set_translation_hint(bs, |
831 |
BIOS_ATA_TRANSLATION_NONE); |
832 |
} |
833 |
} |
834 |
} else {
|
835 |
default_geometry:
|
836 |
/* if no geometry, use a standard physical disk geometry */
|
837 |
cylinders = nb_sectors / (16 * 63); |
838 |
|
839 |
if (cylinders > 16383) |
840 |
cylinders = 16383;
|
841 |
else if (cylinders < 2) |
842 |
cylinders = 2;
|
843 |
*pcyls = cylinders; |
844 |
*pheads = 16;
|
845 |
*psecs = 63;
|
846 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
847 |
if ((*pcyls * *pheads) <= 131072) { |
848 |
bdrv_set_translation_hint(bs, |
849 |
BIOS_ATA_TRANSLATION_LARGE); |
850 |
} else {
|
851 |
bdrv_set_translation_hint(bs, |
852 |
BIOS_ATA_TRANSLATION_LBA); |
853 |
} |
854 |
} |
855 |
} |
856 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
857 |
} |
858 |
} |
859 |
|
860 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
861 |
int cyls, int heads, int secs) |
862 |
{ |
863 |
bs->cyls = cyls; |
864 |
bs->heads = heads; |
865 |
bs->secs = secs; |
866 |
} |
867 |
|
868 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
869 |
{ |
870 |
bs->type = type; |
871 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
872 |
type == BDRV_TYPE_FLOPPY)); |
873 |
} |
874 |
|
875 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
876 |
{ |
877 |
bs->translation = translation; |
878 |
} |
879 |
|
880 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
881 |
int *pcyls, int *pheads, int *psecs) |
882 |
{ |
883 |
*pcyls = bs->cyls; |
884 |
*pheads = bs->heads; |
885 |
*psecs = bs->secs; |
886 |
} |
887 |
|
888 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
889 |
{ |
890 |
return bs->type;
|
891 |
} |
892 |
|
893 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
894 |
{ |
895 |
return bs->translation;
|
896 |
} |
897 |
|
898 |
int bdrv_is_removable(BlockDriverState *bs)
|
899 |
{ |
900 |
return bs->removable;
|
901 |
} |
902 |
|
903 |
int bdrv_is_read_only(BlockDriverState *bs)
|
904 |
{ |
905 |
return bs->read_only;
|
906 |
} |
907 |
|
908 |
int bdrv_is_sg(BlockDriverState *bs)
|
909 |
{ |
910 |
return bs->sg;
|
911 |
} |
912 |
|
913 |
/* XXX: no longer used */
|
914 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
915 |
void (*change_cb)(void *opaque), void *opaque) |
916 |
{ |
917 |
bs->change_cb = change_cb; |
918 |
bs->change_opaque = opaque; |
919 |
} |
920 |
|
921 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
922 |
{ |
923 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
924 |
return 1; |
925 |
return bs->encrypted;
|
926 |
} |
927 |
|
928 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
929 |
{ |
930 |
int ret;
|
931 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
932 |
ret = bdrv_set_key(bs->backing_hd, key); |
933 |
if (ret < 0) |
934 |
return ret;
|
935 |
if (!bs->encrypted)
|
936 |
return 0; |
937 |
} |
938 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
939 |
return -1; |
940 |
return bs->drv->bdrv_set_key(bs, key);
|
941 |
} |
942 |
|
943 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
944 |
{ |
945 |
if (!bs->drv) {
|
946 |
buf[0] = '\0'; |
947 |
} else {
|
948 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
949 |
} |
950 |
} |
951 |
|
952 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
953 |
void *opaque)
|
954 |
{ |
955 |
BlockDriver *drv; |
956 |
|
957 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
958 |
it(opaque, drv->format_name); |
959 |
} |
960 |
} |
961 |
|
962 |
BlockDriverState *bdrv_find(const char *name) |
963 |
{ |
964 |
BlockDriverState *bs; |
965 |
|
966 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
967 |
if (!strcmp(name, bs->device_name))
|
968 |
return bs;
|
969 |
} |
970 |
return NULL; |
971 |
} |
972 |
|
973 |
void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
974 |
{ |
975 |
BlockDriverState *bs; |
976 |
|
977 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
978 |
it(opaque, bs->device_name); |
979 |
} |
980 |
} |
981 |
|
982 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
983 |
{ |
984 |
return bs->device_name;
|
985 |
} |
986 |
|
987 |
void bdrv_flush(BlockDriverState *bs)
|
988 |
{ |
989 |
if (bs->drv->bdrv_flush)
|
990 |
bs->drv->bdrv_flush(bs); |
991 |
if (bs->backing_hd)
|
992 |
bdrv_flush(bs->backing_hd); |
993 |
} |
994 |
|
995 |
void bdrv_flush_all(void) |
996 |
{ |
997 |
BlockDriverState *bs; |
998 |
|
999 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
1000 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
1001 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
1002 |
bdrv_flush(bs); |
1003 |
} |
1004 |
|
1005 |
/*
|
1006 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
1007 |
* not implementing the functionality are assumed to not support backing files,
|
1008 |
* hence all their sectors are reported as allocated.
|
1009 |
*
|
1010 |
* 'pnum' is set to the number of sectors (including and immediately following
|
1011 |
* the specified sector) that are known to be in the same
|
1012 |
* allocated/unallocated state.
|
1013 |
*
|
1014 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
1015 |
*/
|
1016 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
1017 |
int *pnum)
|
1018 |
{ |
1019 |
int64_t n; |
1020 |
if (!bs->drv->bdrv_is_allocated) {
|
1021 |
if (sector_num >= bs->total_sectors) {
|
1022 |
*pnum = 0;
|
1023 |
return 0; |
1024 |
} |
1025 |
n = bs->total_sectors - sector_num; |
1026 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
1027 |
return 1; |
1028 |
} |
1029 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
1030 |
} |
1031 |
|
1032 |
void bdrv_info(void) |
1033 |
{ |
1034 |
BlockDriverState *bs; |
1035 |
|
1036 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1037 |
term_printf("%s:", bs->device_name);
|
1038 |
term_printf(" type=");
|
1039 |
switch(bs->type) {
|
1040 |
case BDRV_TYPE_HD:
|
1041 |
term_printf("hd");
|
1042 |
break;
|
1043 |
case BDRV_TYPE_CDROM:
|
1044 |
term_printf("cdrom");
|
1045 |
break;
|
1046 |
case BDRV_TYPE_FLOPPY:
|
1047 |
term_printf("floppy");
|
1048 |
break;
|
1049 |
} |
1050 |
term_printf(" removable=%d", bs->removable);
|
1051 |
if (bs->removable) {
|
1052 |
term_printf(" locked=%d", bs->locked);
|
1053 |
} |
1054 |
if (bs->drv) {
|
1055 |
term_printf(" file=");
|
1056 |
term_print_filename(bs->filename); |
1057 |
if (bs->backing_file[0] != '\0') { |
1058 |
term_printf(" backing_file=");
|
1059 |
term_print_filename(bs->backing_file); |
1060 |
} |
1061 |
term_printf(" ro=%d", bs->read_only);
|
1062 |
term_printf(" drv=%s", bs->drv->format_name);
|
1063 |
if (bs->encrypted)
|
1064 |
term_printf(" encrypted");
|
1065 |
} else {
|
1066 |
term_printf(" [not inserted]");
|
1067 |
} |
1068 |
term_printf("\n");
|
1069 |
} |
1070 |
} |
1071 |
|
1072 |
/* The "info blockstats" command. */
|
1073 |
void bdrv_info_stats (void) |
1074 |
{ |
1075 |
BlockDriverState *bs; |
1076 |
BlockDriverInfo bdi; |
1077 |
|
1078 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1079 |
term_printf ("%s:"
|
1080 |
" rd_bytes=%" PRIu64
|
1081 |
" wr_bytes=%" PRIu64
|
1082 |
" rd_operations=%" PRIu64
|
1083 |
" wr_operations=%" PRIu64
|
1084 |
, |
1085 |
bs->device_name, |
1086 |
bs->rd_bytes, bs->wr_bytes, |
1087 |
bs->rd_ops, bs->wr_ops); |
1088 |
if (bdrv_get_info(bs, &bdi) == 0) |
1089 |
term_printf(" high=%" PRId64
|
1090 |
" bytes_free=%" PRId64,
|
1091 |
bdi.highest_alloc, bdi.num_free_bytes); |
1092 |
term_printf("\n");
|
1093 |
} |
1094 |
} |
1095 |
|
1096 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
1097 |
char *filename, int filename_size) |
1098 |
{ |
1099 |
if (!bs->backing_hd) {
|
1100 |
pstrcpy(filename, filename_size, "");
|
1101 |
} else {
|
1102 |
pstrcpy(filename, filename_size, bs->backing_file); |
1103 |
} |
1104 |
} |
1105 |
|
1106 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
1107 |
const uint8_t *buf, int nb_sectors) |
1108 |
{ |
1109 |
BlockDriver *drv = bs->drv; |
1110 |
if (!drv)
|
1111 |
return -ENOMEDIUM;
|
1112 |
if (!drv->bdrv_write_compressed)
|
1113 |
return -ENOTSUP;
|
1114 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
1115 |
} |
1116 |
|
1117 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
1118 |
{ |
1119 |
BlockDriver *drv = bs->drv; |
1120 |
if (!drv)
|
1121 |
return -ENOMEDIUM;
|
1122 |
if (!drv->bdrv_get_info)
|
1123 |
return -ENOTSUP;
|
1124 |
memset(bdi, 0, sizeof(*bdi)); |
1125 |
return drv->bdrv_get_info(bs, bdi);
|
1126 |
} |
1127 |
|
1128 |
/**************************************************************/
|
1129 |
/* handling of snapshots */
|
1130 |
|
1131 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
1132 |
QEMUSnapshotInfo *sn_info) |
1133 |
{ |
1134 |
BlockDriver *drv = bs->drv; |
1135 |
if (!drv)
|
1136 |
return -ENOMEDIUM;
|
1137 |
if (!drv->bdrv_snapshot_create)
|
1138 |
return -ENOTSUP;
|
1139 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
1140 |
} |
1141 |
|
1142 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
1143 |
const char *snapshot_id) |
1144 |
{ |
1145 |
BlockDriver *drv = bs->drv; |
1146 |
if (!drv)
|
1147 |
return -ENOMEDIUM;
|
1148 |
if (!drv->bdrv_snapshot_goto)
|
1149 |
return -ENOTSUP;
|
1150 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
1151 |
} |
1152 |
|
1153 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
1154 |
{ |
1155 |
BlockDriver *drv = bs->drv; |
1156 |
if (!drv)
|
1157 |
return -ENOMEDIUM;
|
1158 |
if (!drv->bdrv_snapshot_delete)
|
1159 |
return -ENOTSUP;
|
1160 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
1161 |
} |
1162 |
|
1163 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
1164 |
QEMUSnapshotInfo **psn_info) |
1165 |
{ |
1166 |
BlockDriver *drv = bs->drv; |
1167 |
if (!drv)
|
1168 |
return -ENOMEDIUM;
|
1169 |
if (!drv->bdrv_snapshot_list)
|
1170 |
return -ENOTSUP;
|
1171 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
1172 |
} |
1173 |
|
1174 |
#define NB_SUFFIXES 4 |
1175 |
|
1176 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
1177 |
{ |
1178 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
1179 |
int64_t base; |
1180 |
int i;
|
1181 |
|
1182 |
if (size <= 999) { |
1183 |
snprintf(buf, buf_size, "%" PRId64, size);
|
1184 |
} else {
|
1185 |
base = 1024;
|
1186 |
for(i = 0; i < NB_SUFFIXES; i++) { |
1187 |
if (size < (10 * base)) { |
1188 |
snprintf(buf, buf_size, "%0.1f%c",
|
1189 |
(double)size / base,
|
1190 |
suffixes[i]); |
1191 |
break;
|
1192 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
1193 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
1194 |
((size + (base >> 1)) / base),
|
1195 |
suffixes[i]); |
1196 |
break;
|
1197 |
} |
1198 |
base = base * 1024;
|
1199 |
} |
1200 |
} |
1201 |
return buf;
|
1202 |
} |
1203 |
|
1204 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
1205 |
{ |
1206 |
char buf1[128], date_buf[128], clock_buf[128]; |
1207 |
#ifdef _WIN32
|
1208 |
struct tm *ptm;
|
1209 |
#else
|
1210 |
struct tm tm;
|
1211 |
#endif
|
1212 |
time_t ti; |
1213 |
int64_t secs; |
1214 |
|
1215 |
if (!sn) {
|
1216 |
snprintf(buf, buf_size, |
1217 |
"%-10s%-20s%7s%20s%15s",
|
1218 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1219 |
} else {
|
1220 |
ti = sn->date_sec; |
1221 |
#ifdef _WIN32
|
1222 |
ptm = localtime(&ti); |
1223 |
strftime(date_buf, sizeof(date_buf),
|
1224 |
"%Y-%m-%d %H:%M:%S", ptm);
|
1225 |
#else
|
1226 |
localtime_r(&ti, &tm); |
1227 |
strftime(date_buf, sizeof(date_buf),
|
1228 |
"%Y-%m-%d %H:%M:%S", &tm);
|
1229 |
#endif
|
1230 |
secs = sn->vm_clock_nsec / 1000000000;
|
1231 |
snprintf(clock_buf, sizeof(clock_buf),
|
1232 |
"%02d:%02d:%02d.%03d",
|
1233 |
(int)(secs / 3600), |
1234 |
(int)((secs / 60) % 60), |
1235 |
(int)(secs % 60), |
1236 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1237 |
snprintf(buf, buf_size, |
1238 |
"%-10s%-20s%7s%20s%15s",
|
1239 |
sn->id_str, sn->name, |
1240 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1241 |
date_buf, |
1242 |
clock_buf); |
1243 |
} |
1244 |
return buf;
|
1245 |
} |
1246 |
|
1247 |
|
1248 |
/**************************************************************/
|
1249 |
/* async I/Os */
|
1250 |
|
1251 |
typedef struct VectorTranslationState { |
1252 |
QEMUIOVector *iov; |
1253 |
uint8_t *bounce; |
1254 |
int is_write;
|
1255 |
BlockDriverAIOCB *aiocb; |
1256 |
BlockDriverAIOCB *this_aiocb; |
1257 |
} VectorTranslationState; |
1258 |
|
1259 |
static void bdrv_aio_rw_vector_cb(void *opaque, int ret) |
1260 |
{ |
1261 |
VectorTranslationState *s = opaque; |
1262 |
|
1263 |
if (!s->is_write) {
|
1264 |
qemu_iovec_from_buffer(s->iov, s->bounce, s->iov->size); |
1265 |
} |
1266 |
qemu_free(s->bounce); |
1267 |
s->this_aiocb->cb(s->this_aiocb->opaque, ret); |
1268 |
qemu_aio_release(s->this_aiocb); |
1269 |
} |
1270 |
|
1271 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
1272 |
int64_t sector_num, |
1273 |
QEMUIOVector *iov, |
1274 |
int nb_sectors,
|
1275 |
BlockDriverCompletionFunc *cb, |
1276 |
void *opaque,
|
1277 |
int is_write)
|
1278 |
|
1279 |
{ |
1280 |
VectorTranslationState *s = qemu_mallocz(sizeof(*s));
|
1281 |
BlockDriverAIOCB *aiocb = qemu_aio_get(bs, cb, opaque); |
1282 |
|
1283 |
s->this_aiocb = aiocb; |
1284 |
s->iov = iov; |
1285 |
s->bounce = qemu_memalign(512, nb_sectors * 512); |
1286 |
s->is_write = is_write; |
1287 |
if (is_write) {
|
1288 |
qemu_iovec_to_buffer(s->iov, s->bounce); |
1289 |
s->aiocb = bdrv_aio_write(bs, sector_num, s->bounce, nb_sectors, |
1290 |
bdrv_aio_rw_vector_cb, s); |
1291 |
} else {
|
1292 |
s->aiocb = bdrv_aio_read(bs, sector_num, s->bounce, nb_sectors, |
1293 |
bdrv_aio_rw_vector_cb, s); |
1294 |
} |
1295 |
return aiocb;
|
1296 |
} |
1297 |
|
1298 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
1299 |
QEMUIOVector *iov, int nb_sectors,
|
1300 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1301 |
{ |
1302 |
return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors,
|
1303 |
cb, opaque, 0);
|
1304 |
} |
1305 |
|
1306 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1307 |
QEMUIOVector *iov, int nb_sectors,
|
1308 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1309 |
{ |
1310 |
return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors,
|
1311 |
cb, opaque, 1);
|
1312 |
} |
1313 |
|
1314 |
BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
1315 |
uint8_t *buf, int nb_sectors,
|
1316 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1317 |
{ |
1318 |
BlockDriver *drv = bs->drv; |
1319 |
BlockDriverAIOCB *ret; |
1320 |
|
1321 |
if (!drv)
|
1322 |
return NULL; |
1323 |
|
1324 |
ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
1325 |
|
1326 |
if (ret) {
|
1327 |
/* Update stats even though technically transfer has not happened. */
|
1328 |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1329 |
bs->rd_ops ++; |
1330 |
} |
1331 |
|
1332 |
return ret;
|
1333 |
} |
1334 |
|
1335 |
BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
1336 |
const uint8_t *buf, int nb_sectors, |
1337 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1338 |
{ |
1339 |
BlockDriver *drv = bs->drv; |
1340 |
BlockDriverAIOCB *ret; |
1341 |
|
1342 |
if (!drv)
|
1343 |
return NULL; |
1344 |
if (bs->read_only)
|
1345 |
return NULL; |
1346 |
|
1347 |
ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
1348 |
|
1349 |
if (ret) {
|
1350 |
/* Update stats even though technically transfer has not happened. */
|
1351 |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1352 |
bs->wr_ops ++; |
1353 |
} |
1354 |
|
1355 |
return ret;
|
1356 |
} |
1357 |
|
1358 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
1359 |
{ |
1360 |
BlockDriver *drv = acb->bs->drv; |
1361 |
|
1362 |
if (acb->cb == bdrv_aio_rw_vector_cb) {
|
1363 |
VectorTranslationState *s = acb->opaque; |
1364 |
acb = s->aiocb; |
1365 |
} |
1366 |
|
1367 |
drv->bdrv_aio_cancel(acb); |
1368 |
} |
1369 |
|
1370 |
|
1371 |
/**************************************************************/
|
1372 |
/* async block device emulation */
|
1373 |
|
1374 |
static void bdrv_aio_bh_cb(void *opaque) |
1375 |
{ |
1376 |
BlockDriverAIOCBSync *acb = opaque; |
1377 |
acb->common.cb(acb->common.opaque, acb->ret); |
1378 |
qemu_aio_release(acb); |
1379 |
} |
1380 |
|
1381 |
static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
|
1382 |
int64_t sector_num, uint8_t *buf, int nb_sectors,
|
1383 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1384 |
{ |
1385 |
BlockDriverAIOCBSync *acb; |
1386 |
int ret;
|
1387 |
|
1388 |
acb = qemu_aio_get(bs, cb, opaque); |
1389 |
if (!acb->bh)
|
1390 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1391 |
ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
1392 |
acb->ret = ret; |
1393 |
qemu_bh_schedule(acb->bh); |
1394 |
return &acb->common;
|
1395 |
} |
1396 |
|
1397 |
static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
|
1398 |
int64_t sector_num, const uint8_t *buf, int nb_sectors, |
1399 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1400 |
{ |
1401 |
BlockDriverAIOCBSync *acb; |
1402 |
int ret;
|
1403 |
|
1404 |
acb = qemu_aio_get(bs, cb, opaque); |
1405 |
if (!acb->bh)
|
1406 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1407 |
ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
1408 |
acb->ret = ret; |
1409 |
qemu_bh_schedule(acb->bh); |
1410 |
return &acb->common;
|
1411 |
} |
1412 |
|
1413 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
1414 |
{ |
1415 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1416 |
qemu_bh_cancel(acb->bh); |
1417 |
qemu_aio_release(acb); |
1418 |
} |
1419 |
|
1420 |
/**************************************************************/
|
1421 |
/* sync block device emulation */
|
1422 |
|
1423 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
1424 |
{ |
1425 |
*(int *)opaque = ret;
|
1426 |
} |
1427 |
|
1428 |
#define NOT_DONE 0x7fffffff |
1429 |
|
1430 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
1431 |
uint8_t *buf, int nb_sectors)
|
1432 |
{ |
1433 |
int async_ret;
|
1434 |
BlockDriverAIOCB *acb; |
1435 |
|
1436 |
async_ret = NOT_DONE; |
1437 |
acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
1438 |
bdrv_rw_em_cb, &async_ret); |
1439 |
if (acb == NULL) |
1440 |
return -1; |
1441 |
|
1442 |
while (async_ret == NOT_DONE) {
|
1443 |
qemu_aio_wait(); |
1444 |
} |
1445 |
|
1446 |
return async_ret;
|
1447 |
} |
1448 |
|
1449 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1450 |
const uint8_t *buf, int nb_sectors) |
1451 |
{ |
1452 |
int async_ret;
|
1453 |
BlockDriverAIOCB *acb; |
1454 |
|
1455 |
async_ret = NOT_DONE; |
1456 |
acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
1457 |
bdrv_rw_em_cb, &async_ret); |
1458 |
if (acb == NULL) |
1459 |
return -1; |
1460 |
while (async_ret == NOT_DONE) {
|
1461 |
qemu_aio_wait(); |
1462 |
} |
1463 |
return async_ret;
|
1464 |
} |
1465 |
|
1466 |
void bdrv_init(void) |
1467 |
{ |
1468 |
bdrv_register(&bdrv_raw); |
1469 |
bdrv_register(&bdrv_host_device); |
1470 |
#ifndef _WIN32
|
1471 |
bdrv_register(&bdrv_cow); |
1472 |
#endif
|
1473 |
bdrv_register(&bdrv_qcow); |
1474 |
bdrv_register(&bdrv_vmdk); |
1475 |
bdrv_register(&bdrv_cloop); |
1476 |
bdrv_register(&bdrv_dmg); |
1477 |
bdrv_register(&bdrv_bochs); |
1478 |
bdrv_register(&bdrv_vpc); |
1479 |
bdrv_register(&bdrv_vvfat); |
1480 |
bdrv_register(&bdrv_qcow2); |
1481 |
bdrv_register(&bdrv_parallels); |
1482 |
bdrv_register(&bdrv_nbd); |
1483 |
} |
1484 |
|
1485 |
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
|
1486 |
void *opaque)
|
1487 |
{ |
1488 |
BlockDriver *drv; |
1489 |
BlockDriverAIOCB *acb; |
1490 |
|
1491 |
drv = bs->drv; |
1492 |
if (drv->free_aiocb) {
|
1493 |
acb = drv->free_aiocb; |
1494 |
drv->free_aiocb = acb->next; |
1495 |
} else {
|
1496 |
acb = qemu_mallocz(drv->aiocb_size); |
1497 |
} |
1498 |
acb->bs = bs; |
1499 |
acb->cb = cb; |
1500 |
acb->opaque = opaque; |
1501 |
return acb;
|
1502 |
} |
1503 |
|
1504 |
void qemu_aio_release(void *p) |
1505 |
{ |
1506 |
BlockDriverAIOCB *acb = p; |
1507 |
BlockDriver *drv = acb->bs->drv; |
1508 |
acb->next = drv->free_aiocb; |
1509 |
drv->free_aiocb = acb; |
1510 |
} |
1511 |
|
1512 |
/**************************************************************/
|
1513 |
/* removable device support */
|
1514 |
|
1515 |
/**
|
1516 |
* Return TRUE if the media is present
|
1517 |
*/
|
1518 |
int bdrv_is_inserted(BlockDriverState *bs)
|
1519 |
{ |
1520 |
BlockDriver *drv = bs->drv; |
1521 |
int ret;
|
1522 |
if (!drv)
|
1523 |
return 0; |
1524 |
if (!drv->bdrv_is_inserted)
|
1525 |
return 1; |
1526 |
ret = drv->bdrv_is_inserted(bs); |
1527 |
return ret;
|
1528 |
} |
1529 |
|
1530 |
/**
|
1531 |
* Return TRUE if the media changed since the last call to this
|
1532 |
* function. It is currently only used for floppy disks
|
1533 |
*/
|
1534 |
int bdrv_media_changed(BlockDriverState *bs)
|
1535 |
{ |
1536 |
BlockDriver *drv = bs->drv; |
1537 |
int ret;
|
1538 |
|
1539 |
if (!drv || !drv->bdrv_media_changed)
|
1540 |
ret = -ENOTSUP; |
1541 |
else
|
1542 |
ret = drv->bdrv_media_changed(bs); |
1543 |
if (ret == -ENOTSUP)
|
1544 |
ret = bs->media_changed; |
1545 |
bs->media_changed = 0;
|
1546 |
return ret;
|
1547 |
} |
1548 |
|
1549 |
/**
|
1550 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
1551 |
*/
|
1552 |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
1553 |
{ |
1554 |
BlockDriver *drv = bs->drv; |
1555 |
int ret;
|
1556 |
|
1557 |
if (!drv || !drv->bdrv_eject) {
|
1558 |
ret = -ENOTSUP; |
1559 |
} else {
|
1560 |
ret = drv->bdrv_eject(bs, eject_flag); |
1561 |
} |
1562 |
if (ret == -ENOTSUP) {
|
1563 |
if (eject_flag)
|
1564 |
bdrv_close(bs); |
1565 |
} |
1566 |
} |
1567 |
|
1568 |
int bdrv_is_locked(BlockDriverState *bs)
|
1569 |
{ |
1570 |
return bs->locked;
|
1571 |
} |
1572 |
|
1573 |
/**
|
1574 |
* Lock or unlock the media (if it is locked, the user won't be able
|
1575 |
* to eject it manually).
|
1576 |
*/
|
1577 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
1578 |
{ |
1579 |
BlockDriver *drv = bs->drv; |
1580 |
|
1581 |
bs->locked = locked; |
1582 |
if (drv && drv->bdrv_set_locked) {
|
1583 |
drv->bdrv_set_locked(bs, locked); |
1584 |
} |
1585 |
} |
1586 |
|
1587 |
/* needed for generic scsi interface */
|
1588 |
|
1589 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
1590 |
{ |
1591 |
BlockDriver *drv = bs->drv; |
1592 |
|
1593 |
if (drv && drv->bdrv_ioctl)
|
1594 |
return drv->bdrv_ioctl(bs, req, buf);
|
1595 |
return -ENOTSUP;
|
1596 |
} |