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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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#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 CONFIG_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/queue.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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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 BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque);
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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; |
61 |
|
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static BlockDriver *first_drv;
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63 |
|
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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 == '/'); |
81 |
#endif
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} |
83 |
|
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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;
|
93 |
|
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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); |
98 |
} 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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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; |
133 |
bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
134 |
} else if (!bdrv->bdrv_read) { |
135 |
/* 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; |
138 |
} |
139 |
|
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if (!bdrv->bdrv_aio_flush)
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bdrv->bdrv_aio_flush = bdrv_aio_flush_em; |
142 |
|
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bdrv->next = first_drv; |
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first_drv = bdrv; |
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} |
146 |
|
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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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} |
163 |
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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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} |
173 |
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int bdrv_create(BlockDriver *drv, const char* filename, |
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QEMUOptionParameter *options) |
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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, options);
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} |
182 |
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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); |
203 |
} |
204 |
#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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} |
213 |
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int is_windows_drive(const char *filename) |
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{ |
216 |
if (is_windows_drive_prefix(filename) &&
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filename[2] == '\0') |
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return 1; |
219 |
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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|
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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; |
232 |
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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_find_format("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_find_format("raw"); |
241 |
len = p - filename; |
242 |
if (len > sizeof(protocol) - 1) |
243 |
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) { |
247 |
if (drv1->protocol_name &&
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!strcmp(drv1->protocol_name, protocol)) |
249 |
return drv1;
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} |
251 |
return NULL; |
252 |
} |
253 |
|
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/*
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* Detect host devices. By convention, /dev/cdrom[N] is always
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256 |
* recognized as a host CDROM.
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*/
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static BlockDriver *find_hdev_driver(const char *filename) |
259 |
{ |
260 |
int score_max = 0, score; |
261 |
BlockDriver *drv = NULL, *d;
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262 |
|
263 |
for (d = first_drv; d; d = d->next) {
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if (d->bdrv_probe_device) {
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score = d->bdrv_probe_device(filename); |
266 |
if (score > score_max) {
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score_max = score; |
268 |
drv = d; |
269 |
} |
270 |
} |
271 |
} |
272 |
|
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return drv;
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} |
275 |
|
276 |
static BlockDriver *find_image_format(const char *filename) |
277 |
{ |
278 |
int ret, score, score_max;
|
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BlockDriver *drv1, *drv; |
280 |
uint8_t buf[2048];
|
281 |
BlockDriverState *bs; |
282 |
|
283 |
drv = find_protocol(filename); |
284 |
/* no need to test disk image formats for vvfat */
|
285 |
if (drv && strcmp(drv->format_name, "vvfat") == 0) |
286 |
return drv;
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287 |
|
288 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
289 |
if (ret < 0) |
290 |
return NULL; |
291 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
292 |
bdrv_delete(bs); |
293 |
if (ret < 0) { |
294 |
return NULL; |
295 |
} |
296 |
|
297 |
score_max = 0;
|
298 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
299 |
if (drv1->bdrv_probe) {
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300 |
score = drv1->bdrv_probe(buf, ret, filename); |
301 |
if (score > score_max) {
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302 |
score_max = score; |
303 |
drv = drv1; |
304 |
} |
305 |
} |
306 |
} |
307 |
return drv;
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308 |
} |
309 |
|
310 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
311 |
{ |
312 |
BlockDriverState *bs; |
313 |
int ret;
|
314 |
|
315 |
bs = bdrv_new("");
|
316 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
|
317 |
if (ret < 0) { |
318 |
bdrv_delete(bs); |
319 |
return ret;
|
320 |
} |
321 |
bs->growable = 1;
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322 |
*pbs = bs; |
323 |
return 0; |
324 |
} |
325 |
|
326 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
327 |
{ |
328 |
return bdrv_open2(bs, filename, flags, NULL); |
329 |
} |
330 |
|
331 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
332 |
BlockDriver *drv) |
333 |
{ |
334 |
int ret, open_flags;
|
335 |
char tmp_filename[PATH_MAX];
|
336 |
char backing_filename[PATH_MAX];
|
337 |
|
338 |
bs->read_only = 0;
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339 |
bs->is_temporary = 0;
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340 |
bs->encrypted = 0;
|
341 |
bs->valid_key = 0;
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342 |
/* buffer_alignment defaulted to 512, drivers can change this value */
|
343 |
bs->buffer_alignment = 512;
|
344 |
|
345 |
if (flags & BDRV_O_SNAPSHOT) {
|
346 |
BlockDriverState *bs1; |
347 |
int64_t total_size; |
348 |
int is_protocol = 0; |
349 |
BlockDriver *bdrv_qcow2; |
350 |
QEMUOptionParameter *options; |
351 |
|
352 |
/* if snapshot, we create a temporary backing file and open it
|
353 |
instead of opening 'filename' directly */
|
354 |
|
355 |
/* if there is a backing file, use it */
|
356 |
bs1 = bdrv_new("");
|
357 |
ret = bdrv_open2(bs1, filename, 0, drv);
|
358 |
if (ret < 0) { |
359 |
bdrv_delete(bs1); |
360 |
return ret;
|
361 |
} |
362 |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
363 |
|
364 |
if (bs1->drv && bs1->drv->protocol_name)
|
365 |
is_protocol = 1;
|
366 |
|
367 |
bdrv_delete(bs1); |
368 |
|
369 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
370 |
|
371 |
/* Real path is meaningless for protocols */
|
372 |
if (is_protocol)
|
373 |
snprintf(backing_filename, sizeof(backing_filename),
|
374 |
"%s", filename);
|
375 |
else
|
376 |
realpath(filename, backing_filename); |
377 |
|
378 |
bdrv_qcow2 = bdrv_find_format("qcow2");
|
379 |
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
380 |
|
381 |
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
|
382 |
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
383 |
if (drv) {
|
384 |
set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
385 |
drv->format_name); |
386 |
} |
387 |
|
388 |
ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
389 |
if (ret < 0) { |
390 |
return ret;
|
391 |
} |
392 |
|
393 |
filename = tmp_filename; |
394 |
drv = bdrv_qcow2; |
395 |
bs->is_temporary = 1;
|
396 |
} |
397 |
|
398 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
399 |
if (flags & BDRV_O_FILE) {
|
400 |
drv = find_protocol(filename); |
401 |
} else if (!drv) { |
402 |
drv = find_hdev_driver(filename); |
403 |
if (!drv) {
|
404 |
drv = find_image_format(filename); |
405 |
} |
406 |
} |
407 |
if (!drv) {
|
408 |
ret = -ENOENT; |
409 |
goto unlink_and_fail;
|
410 |
} |
411 |
bs->drv = drv; |
412 |
bs->opaque = qemu_mallocz(drv->instance_size); |
413 |
|
414 |
/*
|
415 |
* Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
|
416 |
* write cache to the guest. We do need the fdatasync to flush
|
417 |
* out transactions for block allocations, and we maybe have a
|
418 |
* volatile write cache in our backing device to deal with.
|
419 |
*/
|
420 |
if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
|
421 |
bs->enable_write_cache = 1;
|
422 |
|
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 | |
427 |
(flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); |
428 |
else
|
429 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
430 |
ret = drv->bdrv_open(bs, filename, open_flags); |
431 |
if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
|
432 |
ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
433 |
bs->read_only = 1;
|
434 |
} |
435 |
if (ret < 0) { |
436 |
qemu_free(bs->opaque); |
437 |
bs->opaque = NULL;
|
438 |
bs->drv = NULL;
|
439 |
unlink_and_fail:
|
440 |
if (bs->is_temporary)
|
441 |
unlink(filename); |
442 |
return ret;
|
443 |
} |
444 |
if (drv->bdrv_getlength) {
|
445 |
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
446 |
} |
447 |
#ifndef _WIN32
|
448 |
if (bs->is_temporary) {
|
449 |
unlink(filename); |
450 |
} |
451 |
#endif
|
452 |
if (bs->backing_file[0] != '\0') { |
453 |
/* if there is a backing file, use it */
|
454 |
BlockDriver *back_drv = NULL;
|
455 |
bs->backing_hd = bdrv_new("");
|
456 |
path_combine(backing_filename, sizeof(backing_filename),
|
457 |
filename, bs->backing_file); |
458 |
if (bs->backing_format[0] != '\0') |
459 |
back_drv = bdrv_find_format(bs->backing_format); |
460 |
ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, |
461 |
back_drv); |
462 |
if (ret < 0) { |
463 |
bdrv_close(bs); |
464 |
return ret;
|
465 |
} |
466 |
} |
467 |
|
468 |
if (!bdrv_key_required(bs)) {
|
469 |
/* call the change callback */
|
470 |
bs->media_changed = 1;
|
471 |
if (bs->change_cb)
|
472 |
bs->change_cb(bs->change_opaque); |
473 |
} |
474 |
return 0; |
475 |
} |
476 |
|
477 |
void bdrv_close(BlockDriverState *bs)
|
478 |
{ |
479 |
if (bs->drv) {
|
480 |
if (bs->backing_hd)
|
481 |
bdrv_delete(bs->backing_hd); |
482 |
bs->drv->bdrv_close(bs); |
483 |
qemu_free(bs->opaque); |
484 |
#ifdef _WIN32
|
485 |
if (bs->is_temporary) {
|
486 |
unlink(bs->filename); |
487 |
} |
488 |
#endif
|
489 |
bs->opaque = NULL;
|
490 |
bs->drv = NULL;
|
491 |
|
492 |
/* call the change callback */
|
493 |
bs->media_changed = 1;
|
494 |
if (bs->change_cb)
|
495 |
bs->change_cb(bs->change_opaque); |
496 |
} |
497 |
} |
498 |
|
499 |
void bdrv_delete(BlockDriverState *bs)
|
500 |
{ |
501 |
BlockDriverState **pbs; |
502 |
|
503 |
pbs = &bdrv_first; |
504 |
while (*pbs != bs && *pbs != NULL) |
505 |
pbs = &(*pbs)->next; |
506 |
if (*pbs == bs)
|
507 |
*pbs = bs->next; |
508 |
|
509 |
bdrv_close(bs); |
510 |
qemu_free(bs); |
511 |
} |
512 |
|
513 |
/*
|
514 |
* Run consistency checks on an image
|
515 |
*
|
516 |
* Returns the number of errors or -errno when an internal error occurs
|
517 |
*/
|
518 |
int bdrv_check(BlockDriverState *bs)
|
519 |
{ |
520 |
if (bs->drv->bdrv_check == NULL) { |
521 |
return -ENOTSUP;
|
522 |
} |
523 |
|
524 |
return bs->drv->bdrv_check(bs);
|
525 |
} |
526 |
|
527 |
/* commit COW file into the raw image */
|
528 |
int bdrv_commit(BlockDriverState *bs)
|
529 |
{ |
530 |
BlockDriver *drv = bs->drv; |
531 |
int64_t i, total_sectors; |
532 |
int n, j;
|
533 |
unsigned char sector[512]; |
534 |
|
535 |
if (!drv)
|
536 |
return -ENOMEDIUM;
|
537 |
|
538 |
if (bs->read_only) {
|
539 |
return -EACCES;
|
540 |
} |
541 |
|
542 |
if (!bs->backing_hd) {
|
543 |
return -ENOTSUP;
|
544 |
} |
545 |
|
546 |
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
547 |
for (i = 0; i < total_sectors;) { |
548 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
549 |
for(j = 0; j < n; j++) { |
550 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
551 |
return -EIO;
|
552 |
} |
553 |
|
554 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
555 |
return -EIO;
|
556 |
} |
557 |
i++; |
558 |
} |
559 |
} else {
|
560 |
i += n; |
561 |
} |
562 |
} |
563 |
|
564 |
if (drv->bdrv_make_empty)
|
565 |
return drv->bdrv_make_empty(bs);
|
566 |
|
567 |
return 0; |
568 |
} |
569 |
|
570 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
571 |
size_t size) |
572 |
{ |
573 |
int64_t len; |
574 |
|
575 |
if (!bdrv_is_inserted(bs))
|
576 |
return -ENOMEDIUM;
|
577 |
|
578 |
if (bs->growable)
|
579 |
return 0; |
580 |
|
581 |
len = bdrv_getlength(bs); |
582 |
|
583 |
if (offset < 0) |
584 |
return -EIO;
|
585 |
|
586 |
if ((offset > len) || (len - offset < size))
|
587 |
return -EIO;
|
588 |
|
589 |
return 0; |
590 |
} |
591 |
|
592 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
593 |
int nb_sectors)
|
594 |
{ |
595 |
return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
596 |
} |
597 |
|
598 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
599 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
600 |
uint8_t *buf, int nb_sectors)
|
601 |
{ |
602 |
BlockDriver *drv = bs->drv; |
603 |
|
604 |
if (!drv)
|
605 |
return -ENOMEDIUM;
|
606 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
607 |
return -EIO;
|
608 |
|
609 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
610 |
} |
611 |
|
612 |
/* Return < 0 if error. Important errors are:
|
613 |
-EIO generic I/O error (may happen for all errors)
|
614 |
-ENOMEDIUM No media inserted.
|
615 |
-EINVAL Invalid sector number or nb_sectors
|
616 |
-EACCES Trying to write a read-only device
|
617 |
*/
|
618 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
619 |
const uint8_t *buf, int nb_sectors) |
620 |
{ |
621 |
BlockDriver *drv = bs->drv; |
622 |
if (!bs->drv)
|
623 |
return -ENOMEDIUM;
|
624 |
if (bs->read_only)
|
625 |
return -EACCES;
|
626 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
627 |
return -EIO;
|
628 |
|
629 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
630 |
} |
631 |
|
632 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
633 |
void *buf, int count1) |
634 |
{ |
635 |
uint8_t tmp_buf[SECTOR_SIZE]; |
636 |
int len, nb_sectors, count;
|
637 |
int64_t sector_num; |
638 |
|
639 |
count = count1; |
640 |
/* first read to align to sector start */
|
641 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
642 |
if (len > count)
|
643 |
len = count; |
644 |
sector_num = offset >> SECTOR_BITS; |
645 |
if (len > 0) { |
646 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
647 |
return -EIO;
|
648 |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
649 |
count -= len; |
650 |
if (count == 0) |
651 |
return count1;
|
652 |
sector_num++; |
653 |
buf += len; |
654 |
} |
655 |
|
656 |
/* read the sectors "in place" */
|
657 |
nb_sectors = count >> SECTOR_BITS; |
658 |
if (nb_sectors > 0) { |
659 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
660 |
return -EIO;
|
661 |
sector_num += nb_sectors; |
662 |
len = nb_sectors << SECTOR_BITS; |
663 |
buf += len; |
664 |
count -= len; |
665 |
} |
666 |
|
667 |
/* add data from the last sector */
|
668 |
if (count > 0) { |
669 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
670 |
return -EIO;
|
671 |
memcpy(buf, tmp_buf, count); |
672 |
} |
673 |
return count1;
|
674 |
} |
675 |
|
676 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
677 |
const void *buf, int count1) |
678 |
{ |
679 |
uint8_t tmp_buf[SECTOR_SIZE]; |
680 |
int len, nb_sectors, count;
|
681 |
int64_t sector_num; |
682 |
|
683 |
count = count1; |
684 |
/* first write to align to sector start */
|
685 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
686 |
if (len > count)
|
687 |
len = count; |
688 |
sector_num = offset >> SECTOR_BITS; |
689 |
if (len > 0) { |
690 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
691 |
return -EIO;
|
692 |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
693 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
694 |
return -EIO;
|
695 |
count -= len; |
696 |
if (count == 0) |
697 |
return count1;
|
698 |
sector_num++; |
699 |
buf += len; |
700 |
} |
701 |
|
702 |
/* write the sectors "in place" */
|
703 |
nb_sectors = count >> SECTOR_BITS; |
704 |
if (nb_sectors > 0) { |
705 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
706 |
return -EIO;
|
707 |
sector_num += nb_sectors; |
708 |
len = nb_sectors << SECTOR_BITS; |
709 |
buf += len; |
710 |
count -= len; |
711 |
} |
712 |
|
713 |
/* add data from the last sector */
|
714 |
if (count > 0) { |
715 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
716 |
return -EIO;
|
717 |
memcpy(tmp_buf, buf, count); |
718 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
719 |
return -EIO;
|
720 |
} |
721 |
return count1;
|
722 |
} |
723 |
|
724 |
/**
|
725 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
726 |
*/
|
727 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
728 |
{ |
729 |
BlockDriver *drv = bs->drv; |
730 |
if (!drv)
|
731 |
return -ENOMEDIUM;
|
732 |
if (!drv->bdrv_truncate)
|
733 |
return -ENOTSUP;
|
734 |
return drv->bdrv_truncate(bs, offset);
|
735 |
} |
736 |
|
737 |
/**
|
738 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
739 |
*/
|
740 |
int64_t bdrv_getlength(BlockDriverState *bs) |
741 |
{ |
742 |
BlockDriver *drv = bs->drv; |
743 |
if (!drv)
|
744 |
return -ENOMEDIUM;
|
745 |
if (!drv->bdrv_getlength) {
|
746 |
/* legacy mode */
|
747 |
return bs->total_sectors * SECTOR_SIZE;
|
748 |
} |
749 |
return drv->bdrv_getlength(bs);
|
750 |
} |
751 |
|
752 |
/* return 0 as number of sectors if no device present or error */
|
753 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
754 |
{ |
755 |
int64_t length; |
756 |
length = bdrv_getlength(bs); |
757 |
if (length < 0) |
758 |
length = 0;
|
759 |
else
|
760 |
length = length >> SECTOR_BITS; |
761 |
*nb_sectors_ptr = length; |
762 |
} |
763 |
|
764 |
struct partition {
|
765 |
uint8_t boot_ind; /* 0x80 - active */
|
766 |
uint8_t head; /* starting head */
|
767 |
uint8_t sector; /* starting sector */
|
768 |
uint8_t cyl; /* starting cylinder */
|
769 |
uint8_t sys_ind; /* What partition type */
|
770 |
uint8_t end_head; /* end head */
|
771 |
uint8_t end_sector; /* end sector */
|
772 |
uint8_t end_cyl; /* end cylinder */
|
773 |
uint32_t start_sect; /* starting sector counting from 0 */
|
774 |
uint32_t nr_sects; /* nr of sectors in partition */
|
775 |
} __attribute__((packed)); |
776 |
|
777 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
778 |
static int guess_disk_lchs(BlockDriverState *bs, |
779 |
int *pcylinders, int *pheads, int *psectors) |
780 |
{ |
781 |
uint8_t buf[512];
|
782 |
int ret, i, heads, sectors, cylinders;
|
783 |
struct partition *p;
|
784 |
uint32_t nr_sects; |
785 |
uint64_t nb_sectors; |
786 |
|
787 |
bdrv_get_geometry(bs, &nb_sectors); |
788 |
|
789 |
ret = bdrv_read(bs, 0, buf, 1); |
790 |
if (ret < 0) |
791 |
return -1; |
792 |
/* test msdos magic */
|
793 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
794 |
return -1; |
795 |
for(i = 0; i < 4; i++) { |
796 |
p = ((struct partition *)(buf + 0x1be)) + i; |
797 |
nr_sects = le32_to_cpu(p->nr_sects); |
798 |
if (nr_sects && p->end_head) {
|
799 |
/* We make the assumption that the partition terminates on
|
800 |
a cylinder boundary */
|
801 |
heads = p->end_head + 1;
|
802 |
sectors = p->end_sector & 63;
|
803 |
if (sectors == 0) |
804 |
continue;
|
805 |
cylinders = nb_sectors / (heads * sectors); |
806 |
if (cylinders < 1 || cylinders > 16383) |
807 |
continue;
|
808 |
*pheads = heads; |
809 |
*psectors = sectors; |
810 |
*pcylinders = cylinders; |
811 |
#if 0
|
812 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
813 |
cylinders, heads, sectors);
|
814 |
#endif
|
815 |
return 0; |
816 |
} |
817 |
} |
818 |
return -1; |
819 |
} |
820 |
|
821 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
822 |
{ |
823 |
int translation, lba_detected = 0; |
824 |
int cylinders, heads, secs;
|
825 |
uint64_t nb_sectors; |
826 |
|
827 |
/* if a geometry hint is available, use it */
|
828 |
bdrv_get_geometry(bs, &nb_sectors); |
829 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
830 |
translation = bdrv_get_translation_hint(bs); |
831 |
if (cylinders != 0) { |
832 |
*pcyls = cylinders; |
833 |
*pheads = heads; |
834 |
*psecs = secs; |
835 |
} else {
|
836 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
837 |
if (heads > 16) { |
838 |
/* if heads > 16, it means that a BIOS LBA
|
839 |
translation was active, so the default
|
840 |
hardware geometry is OK */
|
841 |
lba_detected = 1;
|
842 |
goto default_geometry;
|
843 |
} else {
|
844 |
*pcyls = cylinders; |
845 |
*pheads = heads; |
846 |
*psecs = secs; |
847 |
/* disable any translation to be in sync with
|
848 |
the logical geometry */
|
849 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
850 |
bdrv_set_translation_hint(bs, |
851 |
BIOS_ATA_TRANSLATION_NONE); |
852 |
} |
853 |
} |
854 |
} else {
|
855 |
default_geometry:
|
856 |
/* if no geometry, use a standard physical disk geometry */
|
857 |
cylinders = nb_sectors / (16 * 63); |
858 |
|
859 |
if (cylinders > 16383) |
860 |
cylinders = 16383;
|
861 |
else if (cylinders < 2) |
862 |
cylinders = 2;
|
863 |
*pcyls = cylinders; |
864 |
*pheads = 16;
|
865 |
*psecs = 63;
|
866 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
867 |
if ((*pcyls * *pheads) <= 131072) { |
868 |
bdrv_set_translation_hint(bs, |
869 |
BIOS_ATA_TRANSLATION_LARGE); |
870 |
} else {
|
871 |
bdrv_set_translation_hint(bs, |
872 |
BIOS_ATA_TRANSLATION_LBA); |
873 |
} |
874 |
} |
875 |
} |
876 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
877 |
} |
878 |
} |
879 |
|
880 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
881 |
int cyls, int heads, int secs) |
882 |
{ |
883 |
bs->cyls = cyls; |
884 |
bs->heads = heads; |
885 |
bs->secs = secs; |
886 |
} |
887 |
|
888 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
889 |
{ |
890 |
bs->type = type; |
891 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
892 |
type == BDRV_TYPE_FLOPPY)); |
893 |
} |
894 |
|
895 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
896 |
{ |
897 |
bs->translation = translation; |
898 |
} |
899 |
|
900 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
901 |
int *pcyls, int *pheads, int *psecs) |
902 |
{ |
903 |
*pcyls = bs->cyls; |
904 |
*pheads = bs->heads; |
905 |
*psecs = bs->secs; |
906 |
} |
907 |
|
908 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
909 |
{ |
910 |
return bs->type;
|
911 |
} |
912 |
|
913 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
914 |
{ |
915 |
return bs->translation;
|
916 |
} |
917 |
|
918 |
int bdrv_is_removable(BlockDriverState *bs)
|
919 |
{ |
920 |
return bs->removable;
|
921 |
} |
922 |
|
923 |
int bdrv_is_read_only(BlockDriverState *bs)
|
924 |
{ |
925 |
return bs->read_only;
|
926 |
} |
927 |
|
928 |
int bdrv_is_sg(BlockDriverState *bs)
|
929 |
{ |
930 |
return bs->sg;
|
931 |
} |
932 |
|
933 |
int bdrv_enable_write_cache(BlockDriverState *bs)
|
934 |
{ |
935 |
return bs->enable_write_cache;
|
936 |
} |
937 |
|
938 |
/* XXX: no longer used */
|
939 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
940 |
void (*change_cb)(void *opaque), void *opaque) |
941 |
{ |
942 |
bs->change_cb = change_cb; |
943 |
bs->change_opaque = opaque; |
944 |
} |
945 |
|
946 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
947 |
{ |
948 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
949 |
return 1; |
950 |
return bs->encrypted;
|
951 |
} |
952 |
|
953 |
int bdrv_key_required(BlockDriverState *bs)
|
954 |
{ |
955 |
BlockDriverState *backing_hd = bs->backing_hd; |
956 |
|
957 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
958 |
return 1; |
959 |
return (bs->encrypted && !bs->valid_key);
|
960 |
} |
961 |
|
962 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
963 |
{ |
964 |
int ret;
|
965 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
966 |
ret = bdrv_set_key(bs->backing_hd, key); |
967 |
if (ret < 0) |
968 |
return ret;
|
969 |
if (!bs->encrypted)
|
970 |
return 0; |
971 |
} |
972 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
973 |
return -1; |
974 |
ret = bs->drv->bdrv_set_key(bs, key); |
975 |
if (ret < 0) { |
976 |
bs->valid_key = 0;
|
977 |
} else if (!bs->valid_key) { |
978 |
bs->valid_key = 1;
|
979 |
/* call the change callback now, we skipped it on open */
|
980 |
bs->media_changed = 1;
|
981 |
if (bs->change_cb)
|
982 |
bs->change_cb(bs->change_opaque); |
983 |
} |
984 |
return ret;
|
985 |
} |
986 |
|
987 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
988 |
{ |
989 |
if (!bs->drv) {
|
990 |
buf[0] = '\0'; |
991 |
} else {
|
992 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
993 |
} |
994 |
} |
995 |
|
996 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
997 |
void *opaque)
|
998 |
{ |
999 |
BlockDriver *drv; |
1000 |
|
1001 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
1002 |
it(opaque, drv->format_name); |
1003 |
} |
1004 |
} |
1005 |
|
1006 |
BlockDriverState *bdrv_find(const char *name) |
1007 |
{ |
1008 |
BlockDriverState *bs; |
1009 |
|
1010 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1011 |
if (!strcmp(name, bs->device_name))
|
1012 |
return bs;
|
1013 |
} |
1014 |
return NULL; |
1015 |
} |
1016 |
|
1017 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
1018 |
{ |
1019 |
BlockDriverState *bs; |
1020 |
|
1021 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1022 |
it(opaque, bs); |
1023 |
} |
1024 |
} |
1025 |
|
1026 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
1027 |
{ |
1028 |
return bs->device_name;
|
1029 |
} |
1030 |
|
1031 |
void bdrv_flush(BlockDriverState *bs)
|
1032 |
{ |
1033 |
if (!bs->drv)
|
1034 |
return;
|
1035 |
if (bs->drv->bdrv_flush)
|
1036 |
bs->drv->bdrv_flush(bs); |
1037 |
if (bs->backing_hd)
|
1038 |
bdrv_flush(bs->backing_hd); |
1039 |
} |
1040 |
|
1041 |
void bdrv_flush_all(void) |
1042 |
{ |
1043 |
BlockDriverState *bs; |
1044 |
|
1045 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
1046 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
1047 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
1048 |
bdrv_flush(bs); |
1049 |
} |
1050 |
|
1051 |
/*
|
1052 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
1053 |
* not implementing the functionality are assumed to not support backing files,
|
1054 |
* hence all their sectors are reported as allocated.
|
1055 |
*
|
1056 |
* 'pnum' is set to the number of sectors (including and immediately following
|
1057 |
* the specified sector) that are known to be in the same
|
1058 |
* allocated/unallocated state.
|
1059 |
*
|
1060 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
1061 |
*/
|
1062 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
1063 |
int *pnum)
|
1064 |
{ |
1065 |
int64_t n; |
1066 |
if (!bs->drv->bdrv_is_allocated) {
|
1067 |
if (sector_num >= bs->total_sectors) {
|
1068 |
*pnum = 0;
|
1069 |
return 0; |
1070 |
} |
1071 |
n = bs->total_sectors - sector_num; |
1072 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
1073 |
return 1; |
1074 |
} |
1075 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
1076 |
} |
1077 |
|
1078 |
void bdrv_info(Monitor *mon)
|
1079 |
{ |
1080 |
BlockDriverState *bs; |
1081 |
|
1082 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1083 |
monitor_printf(mon, "%s:", bs->device_name);
|
1084 |
monitor_printf(mon, " type=");
|
1085 |
switch(bs->type) {
|
1086 |
case BDRV_TYPE_HD:
|
1087 |
monitor_printf(mon, "hd");
|
1088 |
break;
|
1089 |
case BDRV_TYPE_CDROM:
|
1090 |
monitor_printf(mon, "cdrom");
|
1091 |
break;
|
1092 |
case BDRV_TYPE_FLOPPY:
|
1093 |
monitor_printf(mon, "floppy");
|
1094 |
break;
|
1095 |
} |
1096 |
monitor_printf(mon, " removable=%d", bs->removable);
|
1097 |
if (bs->removable) {
|
1098 |
monitor_printf(mon, " locked=%d", bs->locked);
|
1099 |
} |
1100 |
if (bs->drv) {
|
1101 |
monitor_printf(mon, " file=");
|
1102 |
monitor_print_filename(mon, bs->filename); |
1103 |
if (bs->backing_file[0] != '\0') { |
1104 |
monitor_printf(mon, " backing_file=");
|
1105 |
monitor_print_filename(mon, bs->backing_file); |
1106 |
} |
1107 |
monitor_printf(mon, " ro=%d", bs->read_only);
|
1108 |
monitor_printf(mon, " drv=%s", bs->drv->format_name);
|
1109 |
monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
|
1110 |
} else {
|
1111 |
monitor_printf(mon, " [not inserted]");
|
1112 |
} |
1113 |
monitor_printf(mon, "\n");
|
1114 |
} |
1115 |
} |
1116 |
|
1117 |
/* The "info blockstats" command. */
|
1118 |
void bdrv_info_stats(Monitor *mon)
|
1119 |
{ |
1120 |
BlockDriverState *bs; |
1121 |
|
1122 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1123 |
monitor_printf(mon, "%s:"
|
1124 |
" rd_bytes=%" PRIu64
|
1125 |
" wr_bytes=%" PRIu64
|
1126 |
" rd_operations=%" PRIu64
|
1127 |
" wr_operations=%" PRIu64
|
1128 |
"\n",
|
1129 |
bs->device_name, |
1130 |
bs->rd_bytes, bs->wr_bytes, |
1131 |
bs->rd_ops, bs->wr_ops); |
1132 |
} |
1133 |
} |
1134 |
|
1135 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1136 |
{ |
1137 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
1138 |
return bs->backing_file;
|
1139 |
else if (bs->encrypted) |
1140 |
return bs->filename;
|
1141 |
else
|
1142 |
return NULL; |
1143 |
} |
1144 |
|
1145 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
1146 |
char *filename, int filename_size) |
1147 |
{ |
1148 |
if (!bs->backing_hd) {
|
1149 |
pstrcpy(filename, filename_size, "");
|
1150 |
} else {
|
1151 |
pstrcpy(filename, filename_size, bs->backing_file); |
1152 |
} |
1153 |
} |
1154 |
|
1155 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
1156 |
const uint8_t *buf, int nb_sectors) |
1157 |
{ |
1158 |
BlockDriver *drv = bs->drv; |
1159 |
if (!drv)
|
1160 |
return -ENOMEDIUM;
|
1161 |
if (!drv->bdrv_write_compressed)
|
1162 |
return -ENOTSUP;
|
1163 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1164 |
return -EIO;
|
1165 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
1166 |
} |
1167 |
|
1168 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
1169 |
{ |
1170 |
BlockDriver *drv = bs->drv; |
1171 |
if (!drv)
|
1172 |
return -ENOMEDIUM;
|
1173 |
if (!drv->bdrv_get_info)
|
1174 |
return -ENOTSUP;
|
1175 |
memset(bdi, 0, sizeof(*bdi)); |
1176 |
return drv->bdrv_get_info(bs, bdi);
|
1177 |
} |
1178 |
|
1179 |
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1180 |
int64_t pos, int size)
|
1181 |
{ |
1182 |
BlockDriver *drv = bs->drv; |
1183 |
if (!drv)
|
1184 |
return -ENOMEDIUM;
|
1185 |
if (!drv->bdrv_save_vmstate)
|
1186 |
return -ENOTSUP;
|
1187 |
return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
1188 |
} |
1189 |
|
1190 |
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
1191 |
int64_t pos, int size)
|
1192 |
{ |
1193 |
BlockDriver *drv = bs->drv; |
1194 |
if (!drv)
|
1195 |
return -ENOMEDIUM;
|
1196 |
if (!drv->bdrv_load_vmstate)
|
1197 |
return -ENOTSUP;
|
1198 |
return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
1199 |
} |
1200 |
|
1201 |
/**************************************************************/
|
1202 |
/* handling of snapshots */
|
1203 |
|
1204 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
1205 |
QEMUSnapshotInfo *sn_info) |
1206 |
{ |
1207 |
BlockDriver *drv = bs->drv; |
1208 |
if (!drv)
|
1209 |
return -ENOMEDIUM;
|
1210 |
if (!drv->bdrv_snapshot_create)
|
1211 |
return -ENOTSUP;
|
1212 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
1213 |
} |
1214 |
|
1215 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
1216 |
const char *snapshot_id) |
1217 |
{ |
1218 |
BlockDriver *drv = bs->drv; |
1219 |
if (!drv)
|
1220 |
return -ENOMEDIUM;
|
1221 |
if (!drv->bdrv_snapshot_goto)
|
1222 |
return -ENOTSUP;
|
1223 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
1224 |
} |
1225 |
|
1226 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
1227 |
{ |
1228 |
BlockDriver *drv = bs->drv; |
1229 |
if (!drv)
|
1230 |
return -ENOMEDIUM;
|
1231 |
if (!drv->bdrv_snapshot_delete)
|
1232 |
return -ENOTSUP;
|
1233 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
1234 |
} |
1235 |
|
1236 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
1237 |
QEMUSnapshotInfo **psn_info) |
1238 |
{ |
1239 |
BlockDriver *drv = bs->drv; |
1240 |
if (!drv)
|
1241 |
return -ENOMEDIUM;
|
1242 |
if (!drv->bdrv_snapshot_list)
|
1243 |
return -ENOTSUP;
|
1244 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
1245 |
} |
1246 |
|
1247 |
#define NB_SUFFIXES 4 |
1248 |
|
1249 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
1250 |
{ |
1251 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
1252 |
int64_t base; |
1253 |
int i;
|
1254 |
|
1255 |
if (size <= 999) { |
1256 |
snprintf(buf, buf_size, "%" PRId64, size);
|
1257 |
} else {
|
1258 |
base = 1024;
|
1259 |
for(i = 0; i < NB_SUFFIXES; i++) { |
1260 |
if (size < (10 * base)) { |
1261 |
snprintf(buf, buf_size, "%0.1f%c",
|
1262 |
(double)size / base,
|
1263 |
suffixes[i]); |
1264 |
break;
|
1265 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
1266 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
1267 |
((size + (base >> 1)) / base),
|
1268 |
suffixes[i]); |
1269 |
break;
|
1270 |
} |
1271 |
base = base * 1024;
|
1272 |
} |
1273 |
} |
1274 |
return buf;
|
1275 |
} |
1276 |
|
1277 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
1278 |
{ |
1279 |
char buf1[128], date_buf[128], clock_buf[128]; |
1280 |
#ifdef _WIN32
|
1281 |
struct tm *ptm;
|
1282 |
#else
|
1283 |
struct tm tm;
|
1284 |
#endif
|
1285 |
time_t ti; |
1286 |
int64_t secs; |
1287 |
|
1288 |
if (!sn) {
|
1289 |
snprintf(buf, buf_size, |
1290 |
"%-10s%-20s%7s%20s%15s",
|
1291 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1292 |
} else {
|
1293 |
ti = sn->date_sec; |
1294 |
#ifdef _WIN32
|
1295 |
ptm = localtime(&ti); |
1296 |
strftime(date_buf, sizeof(date_buf),
|
1297 |
"%Y-%m-%d %H:%M:%S", ptm);
|
1298 |
#else
|
1299 |
localtime_r(&ti, &tm); |
1300 |
strftime(date_buf, sizeof(date_buf),
|
1301 |
"%Y-%m-%d %H:%M:%S", &tm);
|
1302 |
#endif
|
1303 |
secs = sn->vm_clock_nsec / 1000000000;
|
1304 |
snprintf(clock_buf, sizeof(clock_buf),
|
1305 |
"%02d:%02d:%02d.%03d",
|
1306 |
(int)(secs / 3600), |
1307 |
(int)((secs / 60) % 60), |
1308 |
(int)(secs % 60), |
1309 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1310 |
snprintf(buf, buf_size, |
1311 |
"%-10s%-20s%7s%20s%15s",
|
1312 |
sn->id_str, sn->name, |
1313 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1314 |
date_buf, |
1315 |
clock_buf); |
1316 |
} |
1317 |
return buf;
|
1318 |
} |
1319 |
|
1320 |
|
1321 |
/**************************************************************/
|
1322 |
/* async I/Os */
|
1323 |
|
1324 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
1325 |
QEMUIOVector *qiov, int nb_sectors,
|
1326 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1327 |
{ |
1328 |
BlockDriver *drv = bs->drv; |
1329 |
BlockDriverAIOCB *ret; |
1330 |
|
1331 |
if (!drv)
|
1332 |
return NULL; |
1333 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1334 |
return NULL; |
1335 |
|
1336 |
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1337 |
cb, opaque); |
1338 |
|
1339 |
if (ret) {
|
1340 |
/* Update stats even though technically transfer has not happened. */
|
1341 |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1342 |
bs->rd_ops ++; |
1343 |
} |
1344 |
|
1345 |
return ret;
|
1346 |
} |
1347 |
|
1348 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1349 |
QEMUIOVector *qiov, int nb_sectors,
|
1350 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1351 |
{ |
1352 |
BlockDriver *drv = bs->drv; |
1353 |
BlockDriverAIOCB *ret; |
1354 |
|
1355 |
if (!drv)
|
1356 |
return NULL; |
1357 |
if (bs->read_only)
|
1358 |
return NULL; |
1359 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1360 |
return NULL; |
1361 |
|
1362 |
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1363 |
cb, opaque); |
1364 |
|
1365 |
if (ret) {
|
1366 |
/* Update stats even though technically transfer has not happened. */
|
1367 |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1368 |
bs->wr_ops ++; |
1369 |
} |
1370 |
|
1371 |
return ret;
|
1372 |
} |
1373 |
|
1374 |
|
1375 |
typedef struct MultiwriteCB { |
1376 |
int error;
|
1377 |
int num_requests;
|
1378 |
int num_callbacks;
|
1379 |
struct {
|
1380 |
BlockDriverCompletionFunc *cb; |
1381 |
void *opaque;
|
1382 |
QEMUIOVector *free_qiov; |
1383 |
void *free_buf;
|
1384 |
} callbacks[]; |
1385 |
} MultiwriteCB; |
1386 |
|
1387 |
static void multiwrite_user_cb(MultiwriteCB *mcb) |
1388 |
{ |
1389 |
int i;
|
1390 |
|
1391 |
for (i = 0; i < mcb->num_callbacks; i++) { |
1392 |
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
1393 |
qemu_free(mcb->callbacks[i].free_qiov); |
1394 |
qemu_free(mcb->callbacks[i].free_buf); |
1395 |
} |
1396 |
} |
1397 |
|
1398 |
static void multiwrite_cb(void *opaque, int ret) |
1399 |
{ |
1400 |
MultiwriteCB *mcb = opaque; |
1401 |
|
1402 |
if (ret < 0) { |
1403 |
mcb->error = ret; |
1404 |
multiwrite_user_cb(mcb); |
1405 |
} |
1406 |
|
1407 |
mcb->num_requests--; |
1408 |
if (mcb->num_requests == 0) { |
1409 |
if (mcb->error == 0) { |
1410 |
multiwrite_user_cb(mcb); |
1411 |
} |
1412 |
qemu_free(mcb); |
1413 |
} |
1414 |
} |
1415 |
|
1416 |
static int multiwrite_req_compare(const void *a, const void *b) |
1417 |
{ |
1418 |
return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector);
|
1419 |
} |
1420 |
|
1421 |
/*
|
1422 |
* Takes a bunch of requests and tries to merge them. Returns the number of
|
1423 |
* requests that remain after merging.
|
1424 |
*/
|
1425 |
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
1426 |
int num_reqs, MultiwriteCB *mcb)
|
1427 |
{ |
1428 |
int i, outidx;
|
1429 |
|
1430 |
// Sort requests by start sector
|
1431 |
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
1432 |
|
1433 |
// Check if adjacent requests touch the same clusters. If so, combine them,
|
1434 |
// filling up gaps with zero sectors.
|
1435 |
outidx = 0;
|
1436 |
for (i = 1; i < num_reqs; i++) { |
1437 |
int merge = 0; |
1438 |
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
1439 |
|
1440 |
// This handles the cases that are valid for all block drivers, namely
|
1441 |
// exactly sequential writes and overlapping writes.
|
1442 |
if (reqs[i].sector <= oldreq_last) {
|
1443 |
merge = 1;
|
1444 |
} |
1445 |
|
1446 |
// The block driver may decide that it makes sense to combine requests
|
1447 |
// even if there is a gap of some sectors between them. In this case,
|
1448 |
// the gap is filled with zeros (therefore only applicable for yet
|
1449 |
// unused space in format like qcow2).
|
1450 |
if (!merge && bs->drv->bdrv_merge_requests) {
|
1451 |
merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
1452 |
} |
1453 |
|
1454 |
if (merge) {
|
1455 |
size_t size; |
1456 |
QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
|
1457 |
qemu_iovec_init(qiov, |
1458 |
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
1459 |
|
1460 |
// Add the first request to the merged one. If the requests are
|
1461 |
// overlapping, drop the last sectors of the first request.
|
1462 |
size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
1463 |
qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
1464 |
|
1465 |
// We might need to add some zeros between the two requests
|
1466 |
if (reqs[i].sector > oldreq_last) {
|
1467 |
size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
|
1468 |
uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
1469 |
memset(buf, 0, zero_bytes);
|
1470 |
qemu_iovec_add(qiov, buf, zero_bytes); |
1471 |
mcb->callbacks[i].free_buf = buf; |
1472 |
} |
1473 |
|
1474 |
// Add the second request
|
1475 |
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
1476 |
|
1477 |
reqs[outidx].nb_sectors += reqs[i].nb_sectors; |
1478 |
reqs[outidx].qiov = qiov; |
1479 |
|
1480 |
mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
1481 |
} else {
|
1482 |
outidx++; |
1483 |
reqs[outidx].sector = reqs[i].sector; |
1484 |
reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
1485 |
reqs[outidx].qiov = reqs[i].qiov; |
1486 |
} |
1487 |
} |
1488 |
|
1489 |
return outidx + 1; |
1490 |
} |
1491 |
|
1492 |
/*
|
1493 |
* Submit multiple AIO write requests at once.
|
1494 |
*
|
1495 |
* On success, the function returns 0 and all requests in the reqs array have
|
1496 |
* been submitted. In error case this function returns -1, and any of the
|
1497 |
* requests may or may not be submitted yet. In particular, this means that the
|
1498 |
* callback will be called for some of the requests, for others it won't. The
|
1499 |
* caller must check the error field of the BlockRequest to wait for the right
|
1500 |
* callbacks (if error != 0, no callback will be called).
|
1501 |
*
|
1502 |
* The implementation may modify the contents of the reqs array, e.g. to merge
|
1503 |
* requests. However, the fields opaque and error are left unmodified as they
|
1504 |
* are used to signal failure for a single request to the caller.
|
1505 |
*/
|
1506 |
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
1507 |
{ |
1508 |
BlockDriverAIOCB *acb; |
1509 |
MultiwriteCB *mcb; |
1510 |
int i;
|
1511 |
|
1512 |
if (num_reqs == 0) { |
1513 |
return 0; |
1514 |
} |
1515 |
|
1516 |
// Create MultiwriteCB structure
|
1517 |
mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
1518 |
mcb->num_requests = 0;
|
1519 |
mcb->num_callbacks = num_reqs; |
1520 |
|
1521 |
for (i = 0; i < num_reqs; i++) { |
1522 |
mcb->callbacks[i].cb = reqs[i].cb; |
1523 |
mcb->callbacks[i].opaque = reqs[i].opaque; |
1524 |
} |
1525 |
|
1526 |
// Check for mergable requests
|
1527 |
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
1528 |
|
1529 |
// Run the aio requests
|
1530 |
for (i = 0; i < num_reqs; i++) { |
1531 |
acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
1532 |
reqs[i].nb_sectors, multiwrite_cb, mcb); |
1533 |
|
1534 |
if (acb == NULL) { |
1535 |
// We can only fail the whole thing if no request has been
|
1536 |
// submitted yet. Otherwise we'll wait for the submitted AIOs to
|
1537 |
// complete and report the error in the callback.
|
1538 |
if (mcb->num_requests == 0) { |
1539 |
reqs[i].error = EIO; |
1540 |
goto fail;
|
1541 |
} else {
|
1542 |
mcb->error = EIO; |
1543 |
break;
|
1544 |
} |
1545 |
} else {
|
1546 |
mcb->num_requests++; |
1547 |
} |
1548 |
} |
1549 |
|
1550 |
return 0; |
1551 |
|
1552 |
fail:
|
1553 |
free(mcb); |
1554 |
return -1; |
1555 |
} |
1556 |
|
1557 |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
1558 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1559 |
{ |
1560 |
BlockDriver *drv = bs->drv; |
1561 |
|
1562 |
if (!drv)
|
1563 |
return NULL; |
1564 |
|
1565 |
/*
|
1566 |
* Note that unlike bdrv_flush the driver is reponsible for flushing a
|
1567 |
* backing image if it exists.
|
1568 |
*/
|
1569 |
return drv->bdrv_aio_flush(bs, cb, opaque);
|
1570 |
} |
1571 |
|
1572 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
1573 |
{ |
1574 |
acb->pool->cancel(acb); |
1575 |
} |
1576 |
|
1577 |
|
1578 |
/**************************************************************/
|
1579 |
/* async block device emulation */
|
1580 |
|
1581 |
typedef struct BlockDriverAIOCBSync { |
1582 |
BlockDriverAIOCB common; |
1583 |
QEMUBH *bh; |
1584 |
int ret;
|
1585 |
/* vector translation state */
|
1586 |
QEMUIOVector *qiov; |
1587 |
uint8_t *bounce; |
1588 |
int is_write;
|
1589 |
} BlockDriverAIOCBSync; |
1590 |
|
1591 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
1592 |
{ |
1593 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1594 |
qemu_bh_delete(acb->bh); |
1595 |
acb->bh = NULL;
|
1596 |
qemu_aio_release(acb); |
1597 |
} |
1598 |
|
1599 |
static AIOPool bdrv_em_aio_pool = {
|
1600 |
.aiocb_size = sizeof(BlockDriverAIOCBSync),
|
1601 |
.cancel = bdrv_aio_cancel_em, |
1602 |
}; |
1603 |
|
1604 |
static void bdrv_aio_bh_cb(void *opaque) |
1605 |
{ |
1606 |
BlockDriverAIOCBSync *acb = opaque; |
1607 |
|
1608 |
if (!acb->is_write)
|
1609 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
1610 |
qemu_vfree(acb->bounce); |
1611 |
acb->common.cb(acb->common.opaque, acb->ret); |
1612 |
qemu_bh_delete(acb->bh); |
1613 |
acb->bh = NULL;
|
1614 |
qemu_aio_release(acb); |
1615 |
} |
1616 |
|
1617 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
1618 |
int64_t sector_num, |
1619 |
QEMUIOVector *qiov, |
1620 |
int nb_sectors,
|
1621 |
BlockDriverCompletionFunc *cb, |
1622 |
void *opaque,
|
1623 |
int is_write)
|
1624 |
|
1625 |
{ |
1626 |
BlockDriverAIOCBSync *acb; |
1627 |
|
1628 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
1629 |
acb->is_write = is_write; |
1630 |
acb->qiov = qiov; |
1631 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
1632 |
|
1633 |
if (!acb->bh)
|
1634 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1635 |
|
1636 |
if (is_write) {
|
1637 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
1638 |
acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
1639 |
} else {
|
1640 |
acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
1641 |
} |
1642 |
|
1643 |
qemu_bh_schedule(acb->bh); |
1644 |
|
1645 |
return &acb->common;
|
1646 |
} |
1647 |
|
1648 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
1649 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
1650 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1651 |
{ |
1652 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
1653 |
} |
1654 |
|
1655 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
1656 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
1657 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1658 |
{ |
1659 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
1660 |
} |
1661 |
|
1662 |
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
1663 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1664 |
{ |
1665 |
BlockDriverAIOCBSync *acb; |
1666 |
|
1667 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
1668 |
acb->is_write = 1; /* don't bounce in the completion hadler */ |
1669 |
acb->qiov = NULL;
|
1670 |
acb->bounce = NULL;
|
1671 |
acb->ret = 0;
|
1672 |
|
1673 |
if (!acb->bh)
|
1674 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1675 |
|
1676 |
bdrv_flush(bs); |
1677 |
qemu_bh_schedule(acb->bh); |
1678 |
return &acb->common;
|
1679 |
} |
1680 |
|
1681 |
/**************************************************************/
|
1682 |
/* sync block device emulation */
|
1683 |
|
1684 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
1685 |
{ |
1686 |
*(int *)opaque = ret;
|
1687 |
} |
1688 |
|
1689 |
#define NOT_DONE 0x7fffffff |
1690 |
|
1691 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
1692 |
uint8_t *buf, int nb_sectors)
|
1693 |
{ |
1694 |
int async_ret;
|
1695 |
BlockDriverAIOCB *acb; |
1696 |
struct iovec iov;
|
1697 |
QEMUIOVector qiov; |
1698 |
|
1699 |
async_ret = NOT_DONE; |
1700 |
iov.iov_base = (void *)buf;
|
1701 |
iov.iov_len = nb_sectors * 512;
|
1702 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
1703 |
acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
1704 |
bdrv_rw_em_cb, &async_ret); |
1705 |
if (acb == NULL) |
1706 |
return -1; |
1707 |
|
1708 |
while (async_ret == NOT_DONE) {
|
1709 |
qemu_aio_wait(); |
1710 |
} |
1711 |
|
1712 |
return async_ret;
|
1713 |
} |
1714 |
|
1715 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1716 |
const uint8_t *buf, int nb_sectors) |
1717 |
{ |
1718 |
int async_ret;
|
1719 |
BlockDriverAIOCB *acb; |
1720 |
struct iovec iov;
|
1721 |
QEMUIOVector qiov; |
1722 |
|
1723 |
async_ret = NOT_DONE; |
1724 |
iov.iov_base = (void *)buf;
|
1725 |
iov.iov_len = nb_sectors * 512;
|
1726 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
1727 |
acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
1728 |
bdrv_rw_em_cb, &async_ret); |
1729 |
if (acb == NULL) |
1730 |
return -1; |
1731 |
while (async_ret == NOT_DONE) {
|
1732 |
qemu_aio_wait(); |
1733 |
} |
1734 |
return async_ret;
|
1735 |
} |
1736 |
|
1737 |
void bdrv_init(void) |
1738 |
{ |
1739 |
module_call_init(MODULE_INIT_BLOCK); |
1740 |
} |
1741 |
|
1742 |
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
1743 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1744 |
{ |
1745 |
BlockDriverAIOCB *acb; |
1746 |
|
1747 |
if (pool->free_aiocb) {
|
1748 |
acb = pool->free_aiocb; |
1749 |
pool->free_aiocb = acb->next; |
1750 |
} else {
|
1751 |
acb = qemu_mallocz(pool->aiocb_size); |
1752 |
acb->pool = pool; |
1753 |
} |
1754 |
acb->bs = bs; |
1755 |
acb->cb = cb; |
1756 |
acb->opaque = opaque; |
1757 |
return acb;
|
1758 |
} |
1759 |
|
1760 |
void qemu_aio_release(void *p) |
1761 |
{ |
1762 |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
1763 |
AIOPool *pool = acb->pool; |
1764 |
acb->next = pool->free_aiocb; |
1765 |
pool->free_aiocb = acb; |
1766 |
} |
1767 |
|
1768 |
/**************************************************************/
|
1769 |
/* removable device support */
|
1770 |
|
1771 |
/**
|
1772 |
* Return TRUE if the media is present
|
1773 |
*/
|
1774 |
int bdrv_is_inserted(BlockDriverState *bs)
|
1775 |
{ |
1776 |
BlockDriver *drv = bs->drv; |
1777 |
int ret;
|
1778 |
if (!drv)
|
1779 |
return 0; |
1780 |
if (!drv->bdrv_is_inserted)
|
1781 |
return 1; |
1782 |
ret = drv->bdrv_is_inserted(bs); |
1783 |
return ret;
|
1784 |
} |
1785 |
|
1786 |
/**
|
1787 |
* Return TRUE if the media changed since the last call to this
|
1788 |
* function. It is currently only used for floppy disks
|
1789 |
*/
|
1790 |
int bdrv_media_changed(BlockDriverState *bs)
|
1791 |
{ |
1792 |
BlockDriver *drv = bs->drv; |
1793 |
int ret;
|
1794 |
|
1795 |
if (!drv || !drv->bdrv_media_changed)
|
1796 |
ret = -ENOTSUP; |
1797 |
else
|
1798 |
ret = drv->bdrv_media_changed(bs); |
1799 |
if (ret == -ENOTSUP)
|
1800 |
ret = bs->media_changed; |
1801 |
bs->media_changed = 0;
|
1802 |
return ret;
|
1803 |
} |
1804 |
|
1805 |
/**
|
1806 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
1807 |
*/
|
1808 |
int bdrv_eject(BlockDriverState *bs, int eject_flag) |
1809 |
{ |
1810 |
BlockDriver *drv = bs->drv; |
1811 |
int ret;
|
1812 |
|
1813 |
if (bs->locked) {
|
1814 |
return -EBUSY;
|
1815 |
} |
1816 |
|
1817 |
if (!drv || !drv->bdrv_eject) {
|
1818 |
ret = -ENOTSUP; |
1819 |
} else {
|
1820 |
ret = drv->bdrv_eject(bs, eject_flag); |
1821 |
} |
1822 |
if (ret == -ENOTSUP) {
|
1823 |
if (eject_flag)
|
1824 |
bdrv_close(bs); |
1825 |
ret = 0;
|
1826 |
} |
1827 |
|
1828 |
return ret;
|
1829 |
} |
1830 |
|
1831 |
int bdrv_is_locked(BlockDriverState *bs)
|
1832 |
{ |
1833 |
return bs->locked;
|
1834 |
} |
1835 |
|
1836 |
/**
|
1837 |
* Lock or unlock the media (if it is locked, the user won't be able
|
1838 |
* to eject it manually).
|
1839 |
*/
|
1840 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
1841 |
{ |
1842 |
BlockDriver *drv = bs->drv; |
1843 |
|
1844 |
bs->locked = locked; |
1845 |
if (drv && drv->bdrv_set_locked) {
|
1846 |
drv->bdrv_set_locked(bs, locked); |
1847 |
} |
1848 |
} |
1849 |
|
1850 |
/* needed for generic scsi interface */
|
1851 |
|
1852 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
1853 |
{ |
1854 |
BlockDriver *drv = bs->drv; |
1855 |
|
1856 |
if (drv && drv->bdrv_ioctl)
|
1857 |
return drv->bdrv_ioctl(bs, req, buf);
|
1858 |
return -ENOTSUP;
|
1859 |
} |
1860 |
|
1861 |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
1862 |
unsigned long int req, void *buf, |
1863 |
BlockDriverCompletionFunc *cb, void *opaque)
|
1864 |
{ |
1865 |
BlockDriver *drv = bs->drv; |
1866 |
|
1867 |
if (drv && drv->bdrv_aio_ioctl)
|
1868 |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
1869 |
return NULL; |
1870 |
} |
1871 |
|
1872 |
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
1873 |
{ |
1874 |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
1875 |
} |