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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" |
25 |
#include "qemu-common.h" |
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#include "trace.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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#include "qemu-objects.h" |
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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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#ifdef _WIN32
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#include <windows.h> |
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#endif
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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 BlockDriverAIOCB *bdrv_aio_noop_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); |
60 |
|
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static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
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QTAILQ_HEAD_INITIALIZER(bdrv_states); |
63 |
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static QLIST_HEAD(, BlockDriver) bdrv_drivers =
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QLIST_HEAD_INITIALIZER(bdrv_drivers); |
66 |
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/* The device to use for VM snapshots */
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static BlockDriverState *bs_snapshots;
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|
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/* If non-zero, use only whitelisted block drivers */
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static int use_bdrv_whitelist; |
72 |
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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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} |
92 |
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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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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++; |
124 |
else
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p1 = base_path; |
126 |
if (p1 > p)
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p = p1; |
128 |
len = p - base_path; |
129 |
if (len > dest_size - 1) |
130 |
len = dest_size - 1;
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memcpy(dest, base_path, len); |
132 |
dest[len] = '\0';
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pstrcat(dest, dest_size, filename); |
134 |
} |
135 |
} |
136 |
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void bdrv_register(BlockDriver *bdrv)
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{ |
139 |
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; |
142 |
bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
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} else if (!bdrv->bdrv_read) { |
144 |
/* add synchronous IO emulation layer */
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bdrv->bdrv_read = bdrv_read_em; |
146 |
bdrv->bdrv_write = bdrv_write_em; |
147 |
} |
148 |
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if (!bdrv->bdrv_aio_flush)
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bdrv->bdrv_aio_flush = bdrv_aio_flush_em; |
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QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
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} |
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/* create a new block device (by default it is empty) */
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BlockDriverState *bdrv_new(const char *device_name) |
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{ |
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BlockDriverState *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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QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
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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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QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
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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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} |
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return NULL; |
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} |
178 |
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static int bdrv_is_whitelisted(BlockDriver *drv) |
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{ |
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static const char *whitelist[] = { |
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CONFIG_BDRV_WHITELIST |
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}; |
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const char **p; |
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if (!whitelist[0]) |
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return 1; /* no whitelist, anything goes */ |
188 |
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for (p = whitelist; *p; p++) {
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if (!strcmp(drv->format_name, *p)) {
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return 1; |
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} |
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} |
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return 0; |
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} |
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BlockDriver *bdrv_find_whitelisted_format(const char *format_name) |
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{ |
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BlockDriver *drv = bdrv_find_format(format_name); |
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return drv && bdrv_is_whitelisted(drv) ? drv : NULL; |
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} |
202 |
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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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} |
211 |
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int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
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{ |
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BlockDriver *drv; |
215 |
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drv = bdrv_find_protocol(filename); |
217 |
if (drv == NULL) { |
218 |
drv = bdrv_find_format("file");
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} |
220 |
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return bdrv_create(drv, filename, options);
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} |
223 |
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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); |
243 |
close(fd); |
244 |
} |
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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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{ |
250 |
return (((filename[0] >= 'a' && filename[0] <= 'z') || |
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(filename[0] >= 'A' && filename[0] <= 'Z')) && |
252 |
filename[1] == ':'); |
253 |
} |
254 |
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int is_windows_drive(const char *filename) |
256 |
{ |
257 |
if (is_windows_drive_prefix(filename) &&
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filename[2] == '\0') |
259 |
return 1; |
260 |
if (strstart(filename, "\\\\.\\", NULL) || |
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strstart(filename, "//./", NULL)) |
262 |
return 1; |
263 |
return 0; |
264 |
} |
265 |
#endif
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266 |
|
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/*
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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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*/
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static BlockDriver *find_hdev_driver(const char *filename) |
272 |
{ |
273 |
int score_max = 0, score; |
274 |
BlockDriver *drv = NULL, *d;
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275 |
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276 |
QLIST_FOREACH(d, &bdrv_drivers, list) { |
277 |
if (d->bdrv_probe_device) {
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278 |
score = d->bdrv_probe_device(filename); |
279 |
if (score > score_max) {
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280 |
score_max = score; |
281 |
drv = d; |
282 |
} |
283 |
} |
284 |
} |
285 |
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return drv;
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} |
288 |
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289 |
BlockDriver *bdrv_find_protocol(const char *filename) |
290 |
{ |
291 |
BlockDriver *drv1; |
292 |
char protocol[128]; |
293 |
int len;
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294 |
const char *p; |
295 |
|
296 |
/* TODO Drivers without bdrv_file_open must be specified explicitly */
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297 |
|
298 |
/*
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299 |
* XXX(hch): we really should not let host device detection
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300 |
* override an explicit protocol specification, but moving this
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301 |
* later breaks access to device names with colons in them.
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302 |
* Thanks to the brain-dead persistent naming schemes on udev-
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303 |
* based Linux systems those actually are quite common.
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304 |
*/
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305 |
drv1 = find_hdev_driver(filename); |
306 |
if (drv1) {
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307 |
return drv1;
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308 |
} |
309 |
|
310 |
#ifdef _WIN32
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311 |
if (is_windows_drive(filename) ||
|
312 |
is_windows_drive_prefix(filename)) |
313 |
return bdrv_find_format("file"); |
314 |
#endif
|
315 |
|
316 |
p = strchr(filename, ':');
|
317 |
if (!p) {
|
318 |
return bdrv_find_format("file"); |
319 |
} |
320 |
len = p - filename; |
321 |
if (len > sizeof(protocol) - 1) |
322 |
len = sizeof(protocol) - 1; |
323 |
memcpy(protocol, filename, len); |
324 |
protocol[len] = '\0';
|
325 |
QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
326 |
if (drv1->protocol_name &&
|
327 |
!strcmp(drv1->protocol_name, protocol)) { |
328 |
return drv1;
|
329 |
} |
330 |
} |
331 |
return NULL; |
332 |
} |
333 |
|
334 |
static int find_image_format(const char *filename, BlockDriver **pdrv) |
335 |
{ |
336 |
int ret, score, score_max;
|
337 |
BlockDriver *drv1, *drv; |
338 |
uint8_t buf[2048];
|
339 |
BlockDriverState *bs; |
340 |
|
341 |
ret = bdrv_file_open(&bs, filename, 0);
|
342 |
if (ret < 0) { |
343 |
*pdrv = NULL;
|
344 |
return ret;
|
345 |
} |
346 |
|
347 |
/* Return the raw BlockDriver * to scsi-generic devices or empty drives */
|
348 |
if (bs->sg || !bdrv_is_inserted(bs)) {
|
349 |
bdrv_delete(bs); |
350 |
drv = bdrv_find_format("raw");
|
351 |
if (!drv) {
|
352 |
ret = -ENOENT; |
353 |
} |
354 |
*pdrv = drv; |
355 |
return ret;
|
356 |
} |
357 |
|
358 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
359 |
bdrv_delete(bs); |
360 |
if (ret < 0) { |
361 |
*pdrv = NULL;
|
362 |
return ret;
|
363 |
} |
364 |
|
365 |
score_max = 0;
|
366 |
drv = NULL;
|
367 |
QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
368 |
if (drv1->bdrv_probe) {
|
369 |
score = drv1->bdrv_probe(buf, ret, filename); |
370 |
if (score > score_max) {
|
371 |
score_max = score; |
372 |
drv = drv1; |
373 |
} |
374 |
} |
375 |
} |
376 |
if (!drv) {
|
377 |
ret = -ENOENT; |
378 |
} |
379 |
*pdrv = drv; |
380 |
return ret;
|
381 |
} |
382 |
|
383 |
/**
|
384 |
* Set the current 'total_sectors' value
|
385 |
*/
|
386 |
static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
387 |
{ |
388 |
BlockDriver *drv = bs->drv; |
389 |
|
390 |
/* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
|
391 |
if (bs->sg)
|
392 |
return 0; |
393 |
|
394 |
/* query actual device if possible, otherwise just trust the hint */
|
395 |
if (drv->bdrv_getlength) {
|
396 |
int64_t length = drv->bdrv_getlength(bs); |
397 |
if (length < 0) { |
398 |
return length;
|
399 |
} |
400 |
hint = length >> BDRV_SECTOR_BITS; |
401 |
} |
402 |
|
403 |
bs->total_sectors = hint; |
404 |
return 0; |
405 |
} |
406 |
|
407 |
/*
|
408 |
* Common part for opening disk images and files
|
409 |
*/
|
410 |
static int bdrv_open_common(BlockDriverState *bs, const char *filename, |
411 |
int flags, BlockDriver *drv)
|
412 |
{ |
413 |
int ret, open_flags;
|
414 |
|
415 |
assert(drv != NULL);
|
416 |
|
417 |
bs->file = NULL;
|
418 |
bs->total_sectors = 0;
|
419 |
bs->encrypted = 0;
|
420 |
bs->valid_key = 0;
|
421 |
bs->open_flags = flags; |
422 |
/* buffer_alignment defaulted to 512, drivers can change this value */
|
423 |
bs->buffer_alignment = 512;
|
424 |
|
425 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
426 |
|
427 |
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
|
428 |
return -ENOTSUP;
|
429 |
} |
430 |
|
431 |
bs->drv = drv; |
432 |
bs->opaque = qemu_mallocz(drv->instance_size); |
433 |
|
434 |
/*
|
435 |
* Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
|
436 |
* write cache to the guest. We do need the fdatasync to flush
|
437 |
* out transactions for block allocations, and we maybe have a
|
438 |
* volatile write cache in our backing device to deal with.
|
439 |
*/
|
440 |
if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
|
441 |
bs->enable_write_cache = 1;
|
442 |
|
443 |
/*
|
444 |
* Clear flags that are internal to the block layer before opening the
|
445 |
* image.
|
446 |
*/
|
447 |
open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
448 |
|
449 |
/*
|
450 |
* Snapshots should be writeable.
|
451 |
*/
|
452 |
if (bs->is_temporary) {
|
453 |
open_flags |= BDRV_O_RDWR; |
454 |
} |
455 |
|
456 |
/* Open the image, either directly or using a protocol */
|
457 |
if (drv->bdrv_file_open) {
|
458 |
ret = drv->bdrv_file_open(bs, filename, open_flags); |
459 |
} else {
|
460 |
ret = bdrv_file_open(&bs->file, filename, open_flags); |
461 |
if (ret >= 0) { |
462 |
ret = drv->bdrv_open(bs, open_flags); |
463 |
} |
464 |
} |
465 |
|
466 |
if (ret < 0) { |
467 |
goto free_and_fail;
|
468 |
} |
469 |
|
470 |
bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
471 |
|
472 |
ret = refresh_total_sectors(bs, bs->total_sectors); |
473 |
if (ret < 0) { |
474 |
goto free_and_fail;
|
475 |
} |
476 |
|
477 |
#ifndef _WIN32
|
478 |
if (bs->is_temporary) {
|
479 |
unlink(filename); |
480 |
} |
481 |
#endif
|
482 |
return 0; |
483 |
|
484 |
free_and_fail:
|
485 |
if (bs->file) {
|
486 |
bdrv_delete(bs->file); |
487 |
bs->file = NULL;
|
488 |
} |
489 |
qemu_free(bs->opaque); |
490 |
bs->opaque = NULL;
|
491 |
bs->drv = NULL;
|
492 |
return ret;
|
493 |
} |
494 |
|
495 |
/*
|
496 |
* Opens a file using a protocol (file, host_device, nbd, ...)
|
497 |
*/
|
498 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
499 |
{ |
500 |
BlockDriverState *bs; |
501 |
BlockDriver *drv; |
502 |
int ret;
|
503 |
|
504 |
drv = bdrv_find_protocol(filename); |
505 |
if (!drv) {
|
506 |
return -ENOENT;
|
507 |
} |
508 |
|
509 |
bs = bdrv_new("");
|
510 |
ret = bdrv_open_common(bs, filename, flags, drv); |
511 |
if (ret < 0) { |
512 |
bdrv_delete(bs); |
513 |
return ret;
|
514 |
} |
515 |
bs->growable = 1;
|
516 |
*pbs = bs; |
517 |
return 0; |
518 |
} |
519 |
|
520 |
/*
|
521 |
* Opens a disk image (raw, qcow2, vmdk, ...)
|
522 |
*/
|
523 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
524 |
BlockDriver *drv) |
525 |
{ |
526 |
int ret;
|
527 |
|
528 |
if (flags & BDRV_O_SNAPSHOT) {
|
529 |
BlockDriverState *bs1; |
530 |
int64_t total_size; |
531 |
int is_protocol = 0; |
532 |
BlockDriver *bdrv_qcow2; |
533 |
QEMUOptionParameter *options; |
534 |
char tmp_filename[PATH_MAX];
|
535 |
char backing_filename[PATH_MAX];
|
536 |
|
537 |
/* if snapshot, we create a temporary backing file and open it
|
538 |
instead of opening 'filename' directly */
|
539 |
|
540 |
/* if there is a backing file, use it */
|
541 |
bs1 = bdrv_new("");
|
542 |
ret = bdrv_open(bs1, filename, 0, drv);
|
543 |
if (ret < 0) { |
544 |
bdrv_delete(bs1); |
545 |
return ret;
|
546 |
} |
547 |
total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
548 |
|
549 |
if (bs1->drv && bs1->drv->protocol_name)
|
550 |
is_protocol = 1;
|
551 |
|
552 |
bdrv_delete(bs1); |
553 |
|
554 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
555 |
|
556 |
/* Real path is meaningless for protocols */
|
557 |
if (is_protocol)
|
558 |
snprintf(backing_filename, sizeof(backing_filename),
|
559 |
"%s", filename);
|
560 |
else if (!realpath(filename, backing_filename)) |
561 |
return -errno;
|
562 |
|
563 |
bdrv_qcow2 = bdrv_find_format("qcow2");
|
564 |
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
565 |
|
566 |
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
567 |
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
568 |
if (drv) {
|
569 |
set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
570 |
drv->format_name); |
571 |
} |
572 |
|
573 |
ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
574 |
free_option_parameters(options); |
575 |
if (ret < 0) { |
576 |
return ret;
|
577 |
} |
578 |
|
579 |
filename = tmp_filename; |
580 |
drv = bdrv_qcow2; |
581 |
bs->is_temporary = 1;
|
582 |
} |
583 |
|
584 |
/* Find the right image format driver */
|
585 |
if (!drv) {
|
586 |
ret = find_image_format(filename, &drv); |
587 |
} |
588 |
|
589 |
if (!drv) {
|
590 |
goto unlink_and_fail;
|
591 |
} |
592 |
|
593 |
/* Open the image */
|
594 |
ret = bdrv_open_common(bs, filename, flags, drv); |
595 |
if (ret < 0) { |
596 |
goto unlink_and_fail;
|
597 |
} |
598 |
|
599 |
/* If there is a backing file, use it */
|
600 |
if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { |
601 |
char backing_filename[PATH_MAX];
|
602 |
int back_flags;
|
603 |
BlockDriver *back_drv = NULL;
|
604 |
|
605 |
bs->backing_hd = bdrv_new("");
|
606 |
path_combine(backing_filename, sizeof(backing_filename),
|
607 |
filename, bs->backing_file); |
608 |
if (bs->backing_format[0] != '\0') |
609 |
back_drv = bdrv_find_format(bs->backing_format); |
610 |
|
611 |
/* backing files always opened read-only */
|
612 |
back_flags = |
613 |
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
614 |
|
615 |
ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); |
616 |
if (ret < 0) { |
617 |
bdrv_close(bs); |
618 |
return ret;
|
619 |
} |
620 |
if (bs->is_temporary) {
|
621 |
bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); |
622 |
} else {
|
623 |
/* base image inherits from "parent" */
|
624 |
bs->backing_hd->keep_read_only = bs->keep_read_only; |
625 |
} |
626 |
} |
627 |
|
628 |
if (!bdrv_key_required(bs)) {
|
629 |
/* call the change callback */
|
630 |
bs->media_changed = 1;
|
631 |
if (bs->change_cb)
|
632 |
bs->change_cb(bs->change_opaque); |
633 |
} |
634 |
|
635 |
return 0; |
636 |
|
637 |
unlink_and_fail:
|
638 |
if (bs->is_temporary) {
|
639 |
unlink(filename); |
640 |
} |
641 |
return ret;
|
642 |
} |
643 |
|
644 |
void bdrv_close(BlockDriverState *bs)
|
645 |
{ |
646 |
if (bs->drv) {
|
647 |
if (bs == bs_snapshots) {
|
648 |
bs_snapshots = NULL;
|
649 |
} |
650 |
if (bs->backing_hd) {
|
651 |
bdrv_delete(bs->backing_hd); |
652 |
bs->backing_hd = NULL;
|
653 |
} |
654 |
bs->drv->bdrv_close(bs); |
655 |
qemu_free(bs->opaque); |
656 |
#ifdef _WIN32
|
657 |
if (bs->is_temporary) {
|
658 |
unlink(bs->filename); |
659 |
} |
660 |
#endif
|
661 |
bs->opaque = NULL;
|
662 |
bs->drv = NULL;
|
663 |
|
664 |
if (bs->file != NULL) { |
665 |
bdrv_close(bs->file); |
666 |
} |
667 |
|
668 |
/* call the change callback */
|
669 |
bs->media_changed = 1;
|
670 |
if (bs->change_cb)
|
671 |
bs->change_cb(bs->change_opaque); |
672 |
} |
673 |
} |
674 |
|
675 |
void bdrv_close_all(void) |
676 |
{ |
677 |
BlockDriverState *bs; |
678 |
|
679 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
680 |
bdrv_close(bs); |
681 |
} |
682 |
} |
683 |
|
684 |
void bdrv_delete(BlockDriverState *bs)
|
685 |
{ |
686 |
assert(!bs->peer); |
687 |
|
688 |
/* remove from list, if necessary */
|
689 |
if (bs->device_name[0] != '\0') { |
690 |
QTAILQ_REMOVE(&bdrv_states, bs, list); |
691 |
} |
692 |
|
693 |
bdrv_close(bs); |
694 |
if (bs->file != NULL) { |
695 |
bdrv_delete(bs->file); |
696 |
} |
697 |
|
698 |
assert(bs != bs_snapshots); |
699 |
qemu_free(bs); |
700 |
} |
701 |
|
702 |
int bdrv_attach(BlockDriverState *bs, DeviceState *qdev)
|
703 |
{ |
704 |
if (bs->peer) {
|
705 |
return -EBUSY;
|
706 |
} |
707 |
bs->peer = qdev; |
708 |
return 0; |
709 |
} |
710 |
|
711 |
void bdrv_detach(BlockDriverState *bs, DeviceState *qdev)
|
712 |
{ |
713 |
assert(bs->peer == qdev); |
714 |
bs->peer = NULL;
|
715 |
} |
716 |
|
717 |
DeviceState *bdrv_get_attached(BlockDriverState *bs) |
718 |
{ |
719 |
return bs->peer;
|
720 |
} |
721 |
|
722 |
/*
|
723 |
* Run consistency checks on an image
|
724 |
*
|
725 |
* Returns 0 if the check could be completed (it doesn't mean that the image is
|
726 |
* free of errors) or -errno when an internal error occured. The results of the
|
727 |
* check are stored in res.
|
728 |
*/
|
729 |
int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res)
|
730 |
{ |
731 |
if (bs->drv->bdrv_check == NULL) { |
732 |
return -ENOTSUP;
|
733 |
} |
734 |
|
735 |
memset(res, 0, sizeof(*res)); |
736 |
return bs->drv->bdrv_check(bs, res);
|
737 |
} |
738 |
|
739 |
#define COMMIT_BUF_SECTORS 2048 |
740 |
|
741 |
/* commit COW file into the raw image */
|
742 |
int bdrv_commit(BlockDriverState *bs)
|
743 |
{ |
744 |
BlockDriver *drv = bs->drv; |
745 |
BlockDriver *backing_drv; |
746 |
int64_t sector, total_sectors; |
747 |
int n, ro, open_flags;
|
748 |
int ret = 0, rw_ret = 0; |
749 |
uint8_t *buf; |
750 |
char filename[1024]; |
751 |
BlockDriverState *bs_rw, *bs_ro; |
752 |
|
753 |
if (!drv)
|
754 |
return -ENOMEDIUM;
|
755 |
|
756 |
if (!bs->backing_hd) {
|
757 |
return -ENOTSUP;
|
758 |
} |
759 |
|
760 |
if (bs->backing_hd->keep_read_only) {
|
761 |
return -EACCES;
|
762 |
} |
763 |
|
764 |
backing_drv = bs->backing_hd->drv; |
765 |
ro = bs->backing_hd->read_only; |
766 |
strncpy(filename, bs->backing_hd->filename, sizeof(filename));
|
767 |
open_flags = bs->backing_hd->open_flags; |
768 |
|
769 |
if (ro) {
|
770 |
/* re-open as RW */
|
771 |
bdrv_delete(bs->backing_hd); |
772 |
bs->backing_hd = NULL;
|
773 |
bs_rw = bdrv_new("");
|
774 |
rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, |
775 |
backing_drv); |
776 |
if (rw_ret < 0) { |
777 |
bdrv_delete(bs_rw); |
778 |
/* try to re-open read-only */
|
779 |
bs_ro = bdrv_new("");
|
780 |
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
781 |
backing_drv); |
782 |
if (ret < 0) { |
783 |
bdrv_delete(bs_ro); |
784 |
/* drive not functional anymore */
|
785 |
bs->drv = NULL;
|
786 |
return ret;
|
787 |
} |
788 |
bs->backing_hd = bs_ro; |
789 |
return rw_ret;
|
790 |
} |
791 |
bs->backing_hd = bs_rw; |
792 |
} |
793 |
|
794 |
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
795 |
buf = qemu_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
796 |
|
797 |
for (sector = 0; sector < total_sectors; sector += n) { |
798 |
if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) {
|
799 |
|
800 |
if (bdrv_read(bs, sector, buf, n) != 0) { |
801 |
ret = -EIO; |
802 |
goto ro_cleanup;
|
803 |
} |
804 |
|
805 |
if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { |
806 |
ret = -EIO; |
807 |
goto ro_cleanup;
|
808 |
} |
809 |
} |
810 |
} |
811 |
|
812 |
if (drv->bdrv_make_empty) {
|
813 |
ret = drv->bdrv_make_empty(bs); |
814 |
bdrv_flush(bs); |
815 |
} |
816 |
|
817 |
/*
|
818 |
* Make sure all data we wrote to the backing device is actually
|
819 |
* stable on disk.
|
820 |
*/
|
821 |
if (bs->backing_hd)
|
822 |
bdrv_flush(bs->backing_hd); |
823 |
|
824 |
ro_cleanup:
|
825 |
qemu_free(buf); |
826 |
|
827 |
if (ro) {
|
828 |
/* re-open as RO */
|
829 |
bdrv_delete(bs->backing_hd); |
830 |
bs->backing_hd = NULL;
|
831 |
bs_ro = bdrv_new("");
|
832 |
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
833 |
backing_drv); |
834 |
if (ret < 0) { |
835 |
bdrv_delete(bs_ro); |
836 |
/* drive not functional anymore */
|
837 |
bs->drv = NULL;
|
838 |
return ret;
|
839 |
} |
840 |
bs->backing_hd = bs_ro; |
841 |
bs->backing_hd->keep_read_only = 0;
|
842 |
} |
843 |
|
844 |
return ret;
|
845 |
} |
846 |
|
847 |
void bdrv_commit_all(void) |
848 |
{ |
849 |
BlockDriverState *bs; |
850 |
|
851 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
852 |
bdrv_commit(bs); |
853 |
} |
854 |
} |
855 |
|
856 |
/*
|
857 |
* Return values:
|
858 |
* 0 - success
|
859 |
* -EINVAL - backing format specified, but no file
|
860 |
* -ENOSPC - can't update the backing file because no space is left in the
|
861 |
* image file header
|
862 |
* -ENOTSUP - format driver doesn't support changing the backing file
|
863 |
*/
|
864 |
int bdrv_change_backing_file(BlockDriverState *bs,
|
865 |
const char *backing_file, const char *backing_fmt) |
866 |
{ |
867 |
BlockDriver *drv = bs->drv; |
868 |
|
869 |
if (drv->bdrv_change_backing_file != NULL) { |
870 |
return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
|
871 |
} else {
|
872 |
return -ENOTSUP;
|
873 |
} |
874 |
} |
875 |
|
876 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
877 |
size_t size) |
878 |
{ |
879 |
int64_t len; |
880 |
|
881 |
if (!bdrv_is_inserted(bs))
|
882 |
return -ENOMEDIUM;
|
883 |
|
884 |
if (bs->growable)
|
885 |
return 0; |
886 |
|
887 |
len = bdrv_getlength(bs); |
888 |
|
889 |
if (offset < 0) |
890 |
return -EIO;
|
891 |
|
892 |
if ((offset > len) || (len - offset < size))
|
893 |
return -EIO;
|
894 |
|
895 |
return 0; |
896 |
} |
897 |
|
898 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
899 |
int nb_sectors)
|
900 |
{ |
901 |
return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
|
902 |
nb_sectors * BDRV_SECTOR_SIZE); |
903 |
} |
904 |
|
905 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
906 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
907 |
uint8_t *buf, int nb_sectors)
|
908 |
{ |
909 |
BlockDriver *drv = bs->drv; |
910 |
|
911 |
if (!drv)
|
912 |
return -ENOMEDIUM;
|
913 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
914 |
return -EIO;
|
915 |
|
916 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
917 |
} |
918 |
|
919 |
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
920 |
int nb_sectors, int dirty) |
921 |
{ |
922 |
int64_t start, end; |
923 |
unsigned long val, idx, bit; |
924 |
|
925 |
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
926 |
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
927 |
|
928 |
for (; start <= end; start++) {
|
929 |
idx = start / (sizeof(unsigned long) * 8); |
930 |
bit = start % (sizeof(unsigned long) * 8); |
931 |
val = bs->dirty_bitmap[idx]; |
932 |
if (dirty) {
|
933 |
if (!(val & (1UL << bit))) { |
934 |
bs->dirty_count++; |
935 |
val |= 1UL << bit;
|
936 |
} |
937 |
} else {
|
938 |
if (val & (1UL << bit)) { |
939 |
bs->dirty_count--; |
940 |
val &= ~(1UL << bit);
|
941 |
} |
942 |
} |
943 |
bs->dirty_bitmap[idx] = val; |
944 |
} |
945 |
} |
946 |
|
947 |
/* Return < 0 if error. Important errors are:
|
948 |
-EIO generic I/O error (may happen for all errors)
|
949 |
-ENOMEDIUM No media inserted.
|
950 |
-EINVAL Invalid sector number or nb_sectors
|
951 |
-EACCES Trying to write a read-only device
|
952 |
*/
|
953 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
954 |
const uint8_t *buf, int nb_sectors) |
955 |
{ |
956 |
BlockDriver *drv = bs->drv; |
957 |
if (!bs->drv)
|
958 |
return -ENOMEDIUM;
|
959 |
if (bs->read_only)
|
960 |
return -EACCES;
|
961 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
962 |
return -EIO;
|
963 |
|
964 |
if (bs->dirty_bitmap) {
|
965 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
966 |
} |
967 |
|
968 |
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
969 |
bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
970 |
} |
971 |
|
972 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
973 |
} |
974 |
|
975 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
976 |
void *buf, int count1) |
977 |
{ |
978 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
979 |
int len, nb_sectors, count;
|
980 |
int64_t sector_num; |
981 |
int ret;
|
982 |
|
983 |
count = count1; |
984 |
/* first read to align to sector start */
|
985 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
986 |
if (len > count)
|
987 |
len = count; |
988 |
sector_num = offset >> BDRV_SECTOR_BITS; |
989 |
if (len > 0) { |
990 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
991 |
return ret;
|
992 |
memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
|
993 |
count -= len; |
994 |
if (count == 0) |
995 |
return count1;
|
996 |
sector_num++; |
997 |
buf += len; |
998 |
} |
999 |
|
1000 |
/* read the sectors "in place" */
|
1001 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
1002 |
if (nb_sectors > 0) { |
1003 |
if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
1004 |
return ret;
|
1005 |
sector_num += nb_sectors; |
1006 |
len = nb_sectors << BDRV_SECTOR_BITS; |
1007 |
buf += len; |
1008 |
count -= len; |
1009 |
} |
1010 |
|
1011 |
/* add data from the last sector */
|
1012 |
if (count > 0) { |
1013 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1014 |
return ret;
|
1015 |
memcpy(buf, tmp_buf, count); |
1016 |
} |
1017 |
return count1;
|
1018 |
} |
1019 |
|
1020 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
1021 |
const void *buf, int count1) |
1022 |
{ |
1023 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
1024 |
int len, nb_sectors, count;
|
1025 |
int64_t sector_num; |
1026 |
int ret;
|
1027 |
|
1028 |
count = count1; |
1029 |
/* first write to align to sector start */
|
1030 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
1031 |
if (len > count)
|
1032 |
len = count; |
1033 |
sector_num = offset >> BDRV_SECTOR_BITS; |
1034 |
if (len > 0) { |
1035 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1036 |
return ret;
|
1037 |
memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
|
1038 |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1039 |
return ret;
|
1040 |
count -= len; |
1041 |
if (count == 0) |
1042 |
return count1;
|
1043 |
sector_num++; |
1044 |
buf += len; |
1045 |
} |
1046 |
|
1047 |
/* write the sectors "in place" */
|
1048 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
1049 |
if (nb_sectors > 0) { |
1050 |
if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
1051 |
return ret;
|
1052 |
sector_num += nb_sectors; |
1053 |
len = nb_sectors << BDRV_SECTOR_BITS; |
1054 |
buf += len; |
1055 |
count -= len; |
1056 |
} |
1057 |
|
1058 |
/* add data from the last sector */
|
1059 |
if (count > 0) { |
1060 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1061 |
return ret;
|
1062 |
memcpy(tmp_buf, buf, count); |
1063 |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1064 |
return ret;
|
1065 |
} |
1066 |
return count1;
|
1067 |
} |
1068 |
|
1069 |
/*
|
1070 |
* Writes to the file and ensures that no writes are reordered across this
|
1071 |
* request (acts as a barrier)
|
1072 |
*
|
1073 |
* Returns 0 on success, -errno in error cases.
|
1074 |
*/
|
1075 |
int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
|
1076 |
const void *buf, int count) |
1077 |
{ |
1078 |
int ret;
|
1079 |
|
1080 |
ret = bdrv_pwrite(bs, offset, buf, count); |
1081 |
if (ret < 0) { |
1082 |
return ret;
|
1083 |
} |
1084 |
|
1085 |
/* No flush needed for cache=writethrough, it uses O_DSYNC */
|
1086 |
if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) { |
1087 |
bdrv_flush(bs); |
1088 |
} |
1089 |
|
1090 |
return 0; |
1091 |
} |
1092 |
|
1093 |
/*
|
1094 |
* Writes to the file and ensures that no writes are reordered across this
|
1095 |
* request (acts as a barrier)
|
1096 |
*
|
1097 |
* Returns 0 on success, -errno in error cases.
|
1098 |
*/
|
1099 |
int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num,
|
1100 |
const uint8_t *buf, int nb_sectors) |
1101 |
{ |
1102 |
return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num,
|
1103 |
buf, BDRV_SECTOR_SIZE * nb_sectors); |
1104 |
} |
1105 |
|
1106 |
/**
|
1107 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
1108 |
*/
|
1109 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
1110 |
{ |
1111 |
BlockDriver *drv = bs->drv; |
1112 |
int ret;
|
1113 |
if (!drv)
|
1114 |
return -ENOMEDIUM;
|
1115 |
if (!drv->bdrv_truncate)
|
1116 |
return -ENOTSUP;
|
1117 |
if (bs->read_only)
|
1118 |
return -EACCES;
|
1119 |
ret = drv->bdrv_truncate(bs, offset); |
1120 |
if (ret == 0) { |
1121 |
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
1122 |
} |
1123 |
return ret;
|
1124 |
} |
1125 |
|
1126 |
/**
|
1127 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
1128 |
*/
|
1129 |
int64_t bdrv_getlength(BlockDriverState *bs) |
1130 |
{ |
1131 |
BlockDriver *drv = bs->drv; |
1132 |
if (!drv)
|
1133 |
return -ENOMEDIUM;
|
1134 |
|
1135 |
/* Fixed size devices use the total_sectors value for speed instead of
|
1136 |
issuing a length query (like lseek) on each call. Also, legacy block
|
1137 |
drivers don't provide a bdrv_getlength function and must use
|
1138 |
total_sectors. */
|
1139 |
if (!bs->growable || !drv->bdrv_getlength) {
|
1140 |
return bs->total_sectors * BDRV_SECTOR_SIZE;
|
1141 |
} |
1142 |
return drv->bdrv_getlength(bs);
|
1143 |
} |
1144 |
|
1145 |
/* return 0 as number of sectors if no device present or error */
|
1146 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
1147 |
{ |
1148 |
int64_t length; |
1149 |
length = bdrv_getlength(bs); |
1150 |
if (length < 0) |
1151 |
length = 0;
|
1152 |
else
|
1153 |
length = length >> BDRV_SECTOR_BITS; |
1154 |
*nb_sectors_ptr = length; |
1155 |
} |
1156 |
|
1157 |
struct partition {
|
1158 |
uint8_t boot_ind; /* 0x80 - active */
|
1159 |
uint8_t head; /* starting head */
|
1160 |
uint8_t sector; /* starting sector */
|
1161 |
uint8_t cyl; /* starting cylinder */
|
1162 |
uint8_t sys_ind; /* What partition type */
|
1163 |
uint8_t end_head; /* end head */
|
1164 |
uint8_t end_sector; /* end sector */
|
1165 |
uint8_t end_cyl; /* end cylinder */
|
1166 |
uint32_t start_sect; /* starting sector counting from 0 */
|
1167 |
uint32_t nr_sects; /* nr of sectors in partition */
|
1168 |
} __attribute__((packed)); |
1169 |
|
1170 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
1171 |
static int guess_disk_lchs(BlockDriverState *bs, |
1172 |
int *pcylinders, int *pheads, int *psectors) |
1173 |
{ |
1174 |
uint8_t buf[BDRV_SECTOR_SIZE]; |
1175 |
int ret, i, heads, sectors, cylinders;
|
1176 |
struct partition *p;
|
1177 |
uint32_t nr_sects; |
1178 |
uint64_t nb_sectors; |
1179 |
|
1180 |
bdrv_get_geometry(bs, &nb_sectors); |
1181 |
|
1182 |
ret = bdrv_read(bs, 0, buf, 1); |
1183 |
if (ret < 0) |
1184 |
return -1; |
1185 |
/* test msdos magic */
|
1186 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
1187 |
return -1; |
1188 |
for(i = 0; i < 4; i++) { |
1189 |
p = ((struct partition *)(buf + 0x1be)) + i; |
1190 |
nr_sects = le32_to_cpu(p->nr_sects); |
1191 |
if (nr_sects && p->end_head) {
|
1192 |
/* We make the assumption that the partition terminates on
|
1193 |
a cylinder boundary */
|
1194 |
heads = p->end_head + 1;
|
1195 |
sectors = p->end_sector & 63;
|
1196 |
if (sectors == 0) |
1197 |
continue;
|
1198 |
cylinders = nb_sectors / (heads * sectors); |
1199 |
if (cylinders < 1 || cylinders > 16383) |
1200 |
continue;
|
1201 |
*pheads = heads; |
1202 |
*psectors = sectors; |
1203 |
*pcylinders = cylinders; |
1204 |
#if 0
|
1205 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
1206 |
cylinders, heads, sectors);
|
1207 |
#endif
|
1208 |
return 0; |
1209 |
} |
1210 |
} |
1211 |
return -1; |
1212 |
} |
1213 |
|
1214 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
1215 |
{ |
1216 |
int translation, lba_detected = 0; |
1217 |
int cylinders, heads, secs;
|
1218 |
uint64_t nb_sectors; |
1219 |
|
1220 |
/* if a geometry hint is available, use it */
|
1221 |
bdrv_get_geometry(bs, &nb_sectors); |
1222 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
1223 |
translation = bdrv_get_translation_hint(bs); |
1224 |
if (cylinders != 0) { |
1225 |
*pcyls = cylinders; |
1226 |
*pheads = heads; |
1227 |
*psecs = secs; |
1228 |
} else {
|
1229 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
1230 |
if (heads > 16) { |
1231 |
/* if heads > 16, it means that a BIOS LBA
|
1232 |
translation was active, so the default
|
1233 |
hardware geometry is OK */
|
1234 |
lba_detected = 1;
|
1235 |
goto default_geometry;
|
1236 |
} else {
|
1237 |
*pcyls = cylinders; |
1238 |
*pheads = heads; |
1239 |
*psecs = secs; |
1240 |
/* disable any translation to be in sync with
|
1241 |
the logical geometry */
|
1242 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
1243 |
bdrv_set_translation_hint(bs, |
1244 |
BIOS_ATA_TRANSLATION_NONE); |
1245 |
} |
1246 |
} |
1247 |
} else {
|
1248 |
default_geometry:
|
1249 |
/* if no geometry, use a standard physical disk geometry */
|
1250 |
cylinders = nb_sectors / (16 * 63); |
1251 |
|
1252 |
if (cylinders > 16383) |
1253 |
cylinders = 16383;
|
1254 |
else if (cylinders < 2) |
1255 |
cylinders = 2;
|
1256 |
*pcyls = cylinders; |
1257 |
*pheads = 16;
|
1258 |
*psecs = 63;
|
1259 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
1260 |
if ((*pcyls * *pheads) <= 131072) { |
1261 |
bdrv_set_translation_hint(bs, |
1262 |
BIOS_ATA_TRANSLATION_LARGE); |
1263 |
} else {
|
1264 |
bdrv_set_translation_hint(bs, |
1265 |
BIOS_ATA_TRANSLATION_LBA); |
1266 |
} |
1267 |
} |
1268 |
} |
1269 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
1270 |
} |
1271 |
} |
1272 |
|
1273 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
1274 |
int cyls, int heads, int secs) |
1275 |
{ |
1276 |
bs->cyls = cyls; |
1277 |
bs->heads = heads; |
1278 |
bs->secs = secs; |
1279 |
} |
1280 |
|
1281 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
1282 |
{ |
1283 |
bs->type = type; |
1284 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
1285 |
type == BDRV_TYPE_FLOPPY)); |
1286 |
} |
1287 |
|
1288 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
1289 |
{ |
1290 |
bs->translation = translation; |
1291 |
} |
1292 |
|
1293 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
1294 |
int *pcyls, int *pheads, int *psecs) |
1295 |
{ |
1296 |
*pcyls = bs->cyls; |
1297 |
*pheads = bs->heads; |
1298 |
*psecs = bs->secs; |
1299 |
} |
1300 |
|
1301 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
1302 |
{ |
1303 |
return bs->type;
|
1304 |
} |
1305 |
|
1306 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
1307 |
{ |
1308 |
return bs->translation;
|
1309 |
} |
1310 |
|
1311 |
void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
|
1312 |
BlockErrorAction on_write_error) |
1313 |
{ |
1314 |
bs->on_read_error = on_read_error; |
1315 |
bs->on_write_error = on_write_error; |
1316 |
} |
1317 |
|
1318 |
BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
|
1319 |
{ |
1320 |
return is_read ? bs->on_read_error : bs->on_write_error;
|
1321 |
} |
1322 |
|
1323 |
void bdrv_set_removable(BlockDriverState *bs, int removable) |
1324 |
{ |
1325 |
bs->removable = removable; |
1326 |
if (removable && bs == bs_snapshots) {
|
1327 |
bs_snapshots = NULL;
|
1328 |
} |
1329 |
} |
1330 |
|
1331 |
int bdrv_is_removable(BlockDriverState *bs)
|
1332 |
{ |
1333 |
return bs->removable;
|
1334 |
} |
1335 |
|
1336 |
int bdrv_is_read_only(BlockDriverState *bs)
|
1337 |
{ |
1338 |
return bs->read_only;
|
1339 |
} |
1340 |
|
1341 |
int bdrv_is_sg(BlockDriverState *bs)
|
1342 |
{ |
1343 |
return bs->sg;
|
1344 |
} |
1345 |
|
1346 |
int bdrv_enable_write_cache(BlockDriverState *bs)
|
1347 |
{ |
1348 |
return bs->enable_write_cache;
|
1349 |
} |
1350 |
|
1351 |
/* XXX: no longer used */
|
1352 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
1353 |
void (*change_cb)(void *opaque), void *opaque) |
1354 |
{ |
1355 |
bs->change_cb = change_cb; |
1356 |
bs->change_opaque = opaque; |
1357 |
} |
1358 |
|
1359 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
1360 |
{ |
1361 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
1362 |
return 1; |
1363 |
return bs->encrypted;
|
1364 |
} |
1365 |
|
1366 |
int bdrv_key_required(BlockDriverState *bs)
|
1367 |
{ |
1368 |
BlockDriverState *backing_hd = bs->backing_hd; |
1369 |
|
1370 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
1371 |
return 1; |
1372 |
return (bs->encrypted && !bs->valid_key);
|
1373 |
} |
1374 |
|
1375 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
1376 |
{ |
1377 |
int ret;
|
1378 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
1379 |
ret = bdrv_set_key(bs->backing_hd, key); |
1380 |
if (ret < 0) |
1381 |
return ret;
|
1382 |
if (!bs->encrypted)
|
1383 |
return 0; |
1384 |
} |
1385 |
if (!bs->encrypted) {
|
1386 |
return -EINVAL;
|
1387 |
} else if (!bs->drv || !bs->drv->bdrv_set_key) { |
1388 |
return -ENOMEDIUM;
|
1389 |
} |
1390 |
ret = bs->drv->bdrv_set_key(bs, key); |
1391 |
if (ret < 0) { |
1392 |
bs->valid_key = 0;
|
1393 |
} else if (!bs->valid_key) { |
1394 |
bs->valid_key = 1;
|
1395 |
/* call the change callback now, we skipped it on open */
|
1396 |
bs->media_changed = 1;
|
1397 |
if (bs->change_cb)
|
1398 |
bs->change_cb(bs->change_opaque); |
1399 |
} |
1400 |
return ret;
|
1401 |
} |
1402 |
|
1403 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
1404 |
{ |
1405 |
if (!bs->drv) {
|
1406 |
buf[0] = '\0'; |
1407 |
} else {
|
1408 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
1409 |
} |
1410 |
} |
1411 |
|
1412 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
1413 |
void *opaque)
|
1414 |
{ |
1415 |
BlockDriver *drv; |
1416 |
|
1417 |
QLIST_FOREACH(drv, &bdrv_drivers, list) { |
1418 |
it(opaque, drv->format_name); |
1419 |
} |
1420 |
} |
1421 |
|
1422 |
BlockDriverState *bdrv_find(const char *name) |
1423 |
{ |
1424 |
BlockDriverState *bs; |
1425 |
|
1426 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1427 |
if (!strcmp(name, bs->device_name)) {
|
1428 |
return bs;
|
1429 |
} |
1430 |
} |
1431 |
return NULL; |
1432 |
} |
1433 |
|
1434 |
BlockDriverState *bdrv_next(BlockDriverState *bs) |
1435 |
{ |
1436 |
if (!bs) {
|
1437 |
return QTAILQ_FIRST(&bdrv_states);
|
1438 |
} |
1439 |
return QTAILQ_NEXT(bs, list);
|
1440 |
} |
1441 |
|
1442 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
1443 |
{ |
1444 |
BlockDriverState *bs; |
1445 |
|
1446 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1447 |
it(opaque, bs); |
1448 |
} |
1449 |
} |
1450 |
|
1451 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
1452 |
{ |
1453 |
return bs->device_name;
|
1454 |
} |
1455 |
|
1456 |
int bdrv_flush(BlockDriverState *bs)
|
1457 |
{ |
1458 |
if (bs->open_flags & BDRV_O_NO_FLUSH) {
|
1459 |
return 0; |
1460 |
} |
1461 |
|
1462 |
if (bs->drv && bs->drv->bdrv_flush) {
|
1463 |
return bs->drv->bdrv_flush(bs);
|
1464 |
} |
1465 |
|
1466 |
/*
|
1467 |
* Some block drivers always operate in either writethrough or unsafe mode
|
1468 |
* and don't support bdrv_flush therefore. Usually qemu doesn't know how
|
1469 |
* the server works (because the behaviour is hardcoded or depends on
|
1470 |
* server-side configuration), so we can't ensure that everything is safe
|
1471 |
* on disk. Returning an error doesn't work because that would break guests
|
1472 |
* even if the server operates in writethrough mode.
|
1473 |
*
|
1474 |
* Let's hope the user knows what he's doing.
|
1475 |
*/
|
1476 |
return 0; |
1477 |
} |
1478 |
|
1479 |
void bdrv_flush_all(void) |
1480 |
{ |
1481 |
BlockDriverState *bs; |
1482 |
|
1483 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1484 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
1485 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { |
1486 |
bdrv_flush(bs); |
1487 |
} |
1488 |
} |
1489 |
} |
1490 |
|
1491 |
int bdrv_has_zero_init(BlockDriverState *bs)
|
1492 |
{ |
1493 |
assert(bs->drv); |
1494 |
|
1495 |
if (bs->drv->bdrv_has_zero_init) {
|
1496 |
return bs->drv->bdrv_has_zero_init(bs);
|
1497 |
} |
1498 |
|
1499 |
return 1; |
1500 |
} |
1501 |
|
1502 |
/*
|
1503 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
1504 |
* not implementing the functionality are assumed to not support backing files,
|
1505 |
* hence all their sectors are reported as allocated.
|
1506 |
*
|
1507 |
* 'pnum' is set to the number of sectors (including and immediately following
|
1508 |
* the specified sector) that are known to be in the same
|
1509 |
* allocated/unallocated state.
|
1510 |
*
|
1511 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
1512 |
*/
|
1513 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
1514 |
int *pnum)
|
1515 |
{ |
1516 |
int64_t n; |
1517 |
if (!bs->drv->bdrv_is_allocated) {
|
1518 |
if (sector_num >= bs->total_sectors) {
|
1519 |
*pnum = 0;
|
1520 |
return 0; |
1521 |
} |
1522 |
n = bs->total_sectors - sector_num; |
1523 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
1524 |
return 1; |
1525 |
} |
1526 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
1527 |
} |
1528 |
|
1529 |
void bdrv_mon_event(const BlockDriverState *bdrv, |
1530 |
BlockMonEventAction action, int is_read)
|
1531 |
{ |
1532 |
QObject *data; |
1533 |
const char *action_str; |
1534 |
|
1535 |
switch (action) {
|
1536 |
case BDRV_ACTION_REPORT:
|
1537 |
action_str = "report";
|
1538 |
break;
|
1539 |
case BDRV_ACTION_IGNORE:
|
1540 |
action_str = "ignore";
|
1541 |
break;
|
1542 |
case BDRV_ACTION_STOP:
|
1543 |
action_str = "stop";
|
1544 |
break;
|
1545 |
default:
|
1546 |
abort(); |
1547 |
} |
1548 |
|
1549 |
data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
|
1550 |
bdrv->device_name, |
1551 |
action_str, |
1552 |
is_read ? "read" : "write"); |
1553 |
monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); |
1554 |
|
1555 |
qobject_decref(data); |
1556 |
} |
1557 |
|
1558 |
static void bdrv_print_dict(QObject *obj, void *opaque) |
1559 |
{ |
1560 |
QDict *bs_dict; |
1561 |
Monitor *mon = opaque; |
1562 |
|
1563 |
bs_dict = qobject_to_qdict(obj); |
1564 |
|
1565 |
monitor_printf(mon, "%s: type=%s removable=%d",
|
1566 |
qdict_get_str(bs_dict, "device"),
|
1567 |
qdict_get_str(bs_dict, "type"),
|
1568 |
qdict_get_bool(bs_dict, "removable"));
|
1569 |
|
1570 |
if (qdict_get_bool(bs_dict, "removable")) { |
1571 |
monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); |
1572 |
} |
1573 |
|
1574 |
if (qdict_haskey(bs_dict, "inserted")) { |
1575 |
QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
|
1576 |
|
1577 |
monitor_printf(mon, " file=");
|
1578 |
monitor_print_filename(mon, qdict_get_str(qdict, "file"));
|
1579 |
if (qdict_haskey(qdict, "backing_file")) { |
1580 |
monitor_printf(mon, " backing_file=");
|
1581 |
monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
|
1582 |
} |
1583 |
monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
|
1584 |
qdict_get_bool(qdict, "ro"),
|
1585 |
qdict_get_str(qdict, "drv"),
|
1586 |
qdict_get_bool(qdict, "encrypted"));
|
1587 |
} else {
|
1588 |
monitor_printf(mon, " [not inserted]");
|
1589 |
} |
1590 |
|
1591 |
monitor_printf(mon, "\n");
|
1592 |
} |
1593 |
|
1594 |
void bdrv_info_print(Monitor *mon, const QObject *data) |
1595 |
{ |
1596 |
qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); |
1597 |
} |
1598 |
|
1599 |
void bdrv_info(Monitor *mon, QObject **ret_data)
|
1600 |
{ |
1601 |
QList *bs_list; |
1602 |
BlockDriverState *bs; |
1603 |
|
1604 |
bs_list = qlist_new(); |
1605 |
|
1606 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1607 |
QObject *bs_obj; |
1608 |
const char *type = "unknown"; |
1609 |
|
1610 |
switch(bs->type) {
|
1611 |
case BDRV_TYPE_HD:
|
1612 |
type = "hd";
|
1613 |
break;
|
1614 |
case BDRV_TYPE_CDROM:
|
1615 |
type = "cdrom";
|
1616 |
break;
|
1617 |
case BDRV_TYPE_FLOPPY:
|
1618 |
type = "floppy";
|
1619 |
break;
|
1620 |
} |
1621 |
|
1622 |
bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
|
1623 |
"'removable': %i, 'locked': %i }",
|
1624 |
bs->device_name, type, bs->removable, |
1625 |
bs->locked); |
1626 |
|
1627 |
if (bs->drv) {
|
1628 |
QObject *obj; |
1629 |
QDict *bs_dict = qobject_to_qdict(bs_obj); |
1630 |
|
1631 |
obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
|
1632 |
"'encrypted': %i }",
|
1633 |
bs->filename, bs->read_only, |
1634 |
bs->drv->format_name, |
1635 |
bdrv_is_encrypted(bs)); |
1636 |
if (bs->backing_file[0] != '\0') { |
1637 |
QDict *qdict = qobject_to_qdict(obj); |
1638 |
qdict_put(qdict, "backing_file",
|
1639 |
qstring_from_str(bs->backing_file)); |
1640 |
} |
1641 |
|
1642 |
qdict_put_obj(bs_dict, "inserted", obj);
|
1643 |
} |
1644 |
qlist_append_obj(bs_list, bs_obj); |
1645 |
} |
1646 |
|
1647 |
*ret_data = QOBJECT(bs_list); |
1648 |
} |
1649 |
|
1650 |
static void bdrv_stats_iter(QObject *data, void *opaque) |
1651 |
{ |
1652 |
QDict *qdict; |
1653 |
Monitor *mon = opaque; |
1654 |
|
1655 |
qdict = qobject_to_qdict(data); |
1656 |
monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); |
1657 |
|
1658 |
qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
|
1659 |
monitor_printf(mon, " rd_bytes=%" PRId64
|
1660 |
" wr_bytes=%" PRId64
|
1661 |
" rd_operations=%" PRId64
|
1662 |
" wr_operations=%" PRId64
|
1663 |
"\n",
|
1664 |
qdict_get_int(qdict, "rd_bytes"),
|
1665 |
qdict_get_int(qdict, "wr_bytes"),
|
1666 |
qdict_get_int(qdict, "rd_operations"),
|
1667 |
qdict_get_int(qdict, "wr_operations"));
|
1668 |
} |
1669 |
|
1670 |
void bdrv_stats_print(Monitor *mon, const QObject *data) |
1671 |
{ |
1672 |
qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); |
1673 |
} |
1674 |
|
1675 |
static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
|
1676 |
{ |
1677 |
QObject *res; |
1678 |
QDict *dict; |
1679 |
|
1680 |
res = qobject_from_jsonf("{ 'stats': {"
|
1681 |
"'rd_bytes': %" PRId64 "," |
1682 |
"'wr_bytes': %" PRId64 "," |
1683 |
"'rd_operations': %" PRId64 "," |
1684 |
"'wr_operations': %" PRId64 "," |
1685 |
"'wr_highest_offset': %" PRId64
|
1686 |
"} }",
|
1687 |
bs->rd_bytes, bs->wr_bytes, |
1688 |
bs->rd_ops, bs->wr_ops, |
1689 |
bs->wr_highest_sector * |
1690 |
(uint64_t)BDRV_SECTOR_SIZE); |
1691 |
dict = qobject_to_qdict(res); |
1692 |
|
1693 |
if (*bs->device_name) {
|
1694 |
qdict_put(dict, "device", qstring_from_str(bs->device_name));
|
1695 |
} |
1696 |
|
1697 |
if (bs->file) {
|
1698 |
QObject *parent = bdrv_info_stats_bs(bs->file); |
1699 |
qdict_put_obj(dict, "parent", parent);
|
1700 |
} |
1701 |
|
1702 |
return res;
|
1703 |
} |
1704 |
|
1705 |
void bdrv_info_stats(Monitor *mon, QObject **ret_data)
|
1706 |
{ |
1707 |
QObject *obj; |
1708 |
QList *devices; |
1709 |
BlockDriverState *bs; |
1710 |
|
1711 |
devices = qlist_new(); |
1712 |
|
1713 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1714 |
obj = bdrv_info_stats_bs(bs); |
1715 |
qlist_append_obj(devices, obj); |
1716 |
} |
1717 |
|
1718 |
*ret_data = QOBJECT(devices); |
1719 |
} |
1720 |
|
1721 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1722 |
{ |
1723 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
1724 |
return bs->backing_file;
|
1725 |
else if (bs->encrypted) |
1726 |
return bs->filename;
|
1727 |
else
|
1728 |
return NULL; |
1729 |
} |
1730 |
|
1731 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
1732 |
char *filename, int filename_size) |
1733 |
{ |
1734 |
if (!bs->backing_file) {
|
1735 |
pstrcpy(filename, filename_size, "");
|
1736 |
} else {
|
1737 |
pstrcpy(filename, filename_size, bs->backing_file); |
1738 |
} |
1739 |
} |
1740 |
|
1741 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
1742 |
const uint8_t *buf, int nb_sectors) |
1743 |
{ |
1744 |
BlockDriver *drv = bs->drv; |
1745 |
if (!drv)
|
1746 |
return -ENOMEDIUM;
|
1747 |
if (!drv->bdrv_write_compressed)
|
1748 |
return -ENOTSUP;
|
1749 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1750 |
return -EIO;
|
1751 |
|
1752 |
if (bs->dirty_bitmap) {
|
1753 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1754 |
} |
1755 |
|
1756 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
1757 |
} |
1758 |
|
1759 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
1760 |
{ |
1761 |
BlockDriver *drv = bs->drv; |
1762 |
if (!drv)
|
1763 |
return -ENOMEDIUM;
|
1764 |
if (!drv->bdrv_get_info)
|
1765 |
return -ENOTSUP;
|
1766 |
memset(bdi, 0, sizeof(*bdi)); |
1767 |
return drv->bdrv_get_info(bs, bdi);
|
1768 |
} |
1769 |
|
1770 |
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1771 |
int64_t pos, int size)
|
1772 |
{ |
1773 |
BlockDriver *drv = bs->drv; |
1774 |
if (!drv)
|
1775 |
return -ENOMEDIUM;
|
1776 |
if (drv->bdrv_save_vmstate)
|
1777 |
return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
1778 |
if (bs->file)
|
1779 |
return bdrv_save_vmstate(bs->file, buf, pos, size);
|
1780 |
return -ENOTSUP;
|
1781 |
} |
1782 |
|
1783 |
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
1784 |
int64_t pos, int size)
|
1785 |
{ |
1786 |
BlockDriver *drv = bs->drv; |
1787 |
if (!drv)
|
1788 |
return -ENOMEDIUM;
|
1789 |
if (drv->bdrv_load_vmstate)
|
1790 |
return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
1791 |
if (bs->file)
|
1792 |
return bdrv_load_vmstate(bs->file, buf, pos, size);
|
1793 |
return -ENOTSUP;
|
1794 |
} |
1795 |
|
1796 |
void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
|
1797 |
{ |
1798 |
BlockDriver *drv = bs->drv; |
1799 |
|
1800 |
if (!drv || !drv->bdrv_debug_event) {
|
1801 |
return;
|
1802 |
} |
1803 |
|
1804 |
return drv->bdrv_debug_event(bs, event);
|
1805 |
|
1806 |
} |
1807 |
|
1808 |
/**************************************************************/
|
1809 |
/* handling of snapshots */
|
1810 |
|
1811 |
int bdrv_can_snapshot(BlockDriverState *bs)
|
1812 |
{ |
1813 |
BlockDriver *drv = bs->drv; |
1814 |
if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) {
|
1815 |
return 0; |
1816 |
} |
1817 |
|
1818 |
if (!drv->bdrv_snapshot_create) {
|
1819 |
if (bs->file != NULL) { |
1820 |
return bdrv_can_snapshot(bs->file);
|
1821 |
} |
1822 |
return 0; |
1823 |
} |
1824 |
|
1825 |
return 1; |
1826 |
} |
1827 |
|
1828 |
int bdrv_is_snapshot(BlockDriverState *bs)
|
1829 |
{ |
1830 |
return !!(bs->open_flags & BDRV_O_SNAPSHOT);
|
1831 |
} |
1832 |
|
1833 |
BlockDriverState *bdrv_snapshots(void)
|
1834 |
{ |
1835 |
BlockDriverState *bs; |
1836 |
|
1837 |
if (bs_snapshots) {
|
1838 |
return bs_snapshots;
|
1839 |
} |
1840 |
|
1841 |
bs = NULL;
|
1842 |
while ((bs = bdrv_next(bs))) {
|
1843 |
if (bdrv_can_snapshot(bs)) {
|
1844 |
bs_snapshots = bs; |
1845 |
return bs;
|
1846 |
} |
1847 |
} |
1848 |
return NULL; |
1849 |
} |
1850 |
|
1851 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
1852 |
QEMUSnapshotInfo *sn_info) |
1853 |
{ |
1854 |
BlockDriver *drv = bs->drv; |
1855 |
if (!drv)
|
1856 |
return -ENOMEDIUM;
|
1857 |
if (drv->bdrv_snapshot_create)
|
1858 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
1859 |
if (bs->file)
|
1860 |
return bdrv_snapshot_create(bs->file, sn_info);
|
1861 |
return -ENOTSUP;
|
1862 |
} |
1863 |
|
1864 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
1865 |
const char *snapshot_id) |
1866 |
{ |
1867 |
BlockDriver *drv = bs->drv; |
1868 |
int ret, open_ret;
|
1869 |
|
1870 |
if (!drv)
|
1871 |
return -ENOMEDIUM;
|
1872 |
if (drv->bdrv_snapshot_goto)
|
1873 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
1874 |
|
1875 |
if (bs->file) {
|
1876 |
drv->bdrv_close(bs); |
1877 |
ret = bdrv_snapshot_goto(bs->file, snapshot_id); |
1878 |
open_ret = drv->bdrv_open(bs, bs->open_flags); |
1879 |
if (open_ret < 0) { |
1880 |
bdrv_delete(bs->file); |
1881 |
bs->drv = NULL;
|
1882 |
return open_ret;
|
1883 |
} |
1884 |
return ret;
|
1885 |
} |
1886 |
|
1887 |
return -ENOTSUP;
|
1888 |
} |
1889 |
|
1890 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
1891 |
{ |
1892 |
BlockDriver *drv = bs->drv; |
1893 |
if (!drv)
|
1894 |
return -ENOMEDIUM;
|
1895 |
if (drv->bdrv_snapshot_delete)
|
1896 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
1897 |
if (bs->file)
|
1898 |
return bdrv_snapshot_delete(bs->file, snapshot_id);
|
1899 |
return -ENOTSUP;
|
1900 |
} |
1901 |
|
1902 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
1903 |
QEMUSnapshotInfo **psn_info) |
1904 |
{ |
1905 |
BlockDriver *drv = bs->drv; |
1906 |
if (!drv)
|
1907 |
return -ENOMEDIUM;
|
1908 |
if (drv->bdrv_snapshot_list)
|
1909 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
1910 |
if (bs->file)
|
1911 |
return bdrv_snapshot_list(bs->file, psn_info);
|
1912 |
return -ENOTSUP;
|
1913 |
} |
1914 |
|
1915 |
int bdrv_snapshot_load_tmp(BlockDriverState *bs,
|
1916 |
const char *snapshot_name) |
1917 |
{ |
1918 |
BlockDriver *drv = bs->drv; |
1919 |
if (!drv) {
|
1920 |
return -ENOMEDIUM;
|
1921 |
} |
1922 |
if (!bs->read_only) {
|
1923 |
return -EINVAL;
|
1924 |
} |
1925 |
if (drv->bdrv_snapshot_load_tmp) {
|
1926 |
return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
|
1927 |
} |
1928 |
return -ENOTSUP;
|
1929 |
} |
1930 |
|
1931 |
#define NB_SUFFIXES 4 |
1932 |
|
1933 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
1934 |
{ |
1935 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
1936 |
int64_t base; |
1937 |
int i;
|
1938 |
|
1939 |
if (size <= 999) { |
1940 |
snprintf(buf, buf_size, "%" PRId64, size);
|
1941 |
} else {
|
1942 |
base = 1024;
|
1943 |
for(i = 0; i < NB_SUFFIXES; i++) { |
1944 |
if (size < (10 * base)) { |
1945 |
snprintf(buf, buf_size, "%0.1f%c",
|
1946 |
(double)size / base,
|
1947 |
suffixes[i]); |
1948 |
break;
|
1949 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
1950 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
1951 |
((size + (base >> 1)) / base),
|
1952 |
suffixes[i]); |
1953 |
break;
|
1954 |
} |
1955 |
base = base * 1024;
|
1956 |
} |
1957 |
} |
1958 |
return buf;
|
1959 |
} |
1960 |
|
1961 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
1962 |
{ |
1963 |
char buf1[128], date_buf[128], clock_buf[128]; |
1964 |
#ifdef _WIN32
|
1965 |
struct tm *ptm;
|
1966 |
#else
|
1967 |
struct tm tm;
|
1968 |
#endif
|
1969 |
time_t ti; |
1970 |
int64_t secs; |
1971 |
|
1972 |
if (!sn) {
|
1973 |
snprintf(buf, buf_size, |
1974 |
"%-10s%-20s%7s%20s%15s",
|
1975 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1976 |
} else {
|
1977 |
ti = sn->date_sec; |
1978 |
#ifdef _WIN32
|
1979 |
ptm = localtime(&ti); |
1980 |
strftime(date_buf, sizeof(date_buf),
|
1981 |
"%Y-%m-%d %H:%M:%S", ptm);
|
1982 |
#else
|
1983 |
localtime_r(&ti, &tm); |
1984 |
strftime(date_buf, sizeof(date_buf),
|
1985 |
"%Y-%m-%d %H:%M:%S", &tm);
|
1986 |
#endif
|
1987 |
secs = sn->vm_clock_nsec / 1000000000;
|
1988 |
snprintf(clock_buf, sizeof(clock_buf),
|
1989 |
"%02d:%02d:%02d.%03d",
|
1990 |
(int)(secs / 3600), |
1991 |
(int)((secs / 60) % 60), |
1992 |
(int)(secs % 60), |
1993 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1994 |
snprintf(buf, buf_size, |
1995 |
"%-10s%-20s%7s%20s%15s",
|
1996 |
sn->id_str, sn->name, |
1997 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1998 |
date_buf, |
1999 |
clock_buf); |
2000 |
} |
2001 |
return buf;
|
2002 |
} |
2003 |
|
2004 |
|
2005 |
/**************************************************************/
|
2006 |
/* async I/Os */
|
2007 |
|
2008 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
2009 |
QEMUIOVector *qiov, int nb_sectors,
|
2010 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2011 |
{ |
2012 |
BlockDriver *drv = bs->drv; |
2013 |
BlockDriverAIOCB *ret; |
2014 |
|
2015 |
trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
2016 |
|
2017 |
if (!drv)
|
2018 |
return NULL; |
2019 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
2020 |
return NULL; |
2021 |
|
2022 |
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
2023 |
cb, opaque); |
2024 |
|
2025 |
if (ret) {
|
2026 |
/* Update stats even though technically transfer has not happened. */
|
2027 |
bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
2028 |
bs->rd_ops ++; |
2029 |
} |
2030 |
|
2031 |
return ret;
|
2032 |
} |
2033 |
|
2034 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
2035 |
QEMUIOVector *qiov, int nb_sectors,
|
2036 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2037 |
{ |
2038 |
BlockDriver *drv = bs->drv; |
2039 |
BlockDriverAIOCB *ret; |
2040 |
|
2041 |
trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
2042 |
|
2043 |
if (!drv)
|
2044 |
return NULL; |
2045 |
if (bs->read_only)
|
2046 |
return NULL; |
2047 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
2048 |
return NULL; |
2049 |
|
2050 |
if (bs->dirty_bitmap) {
|
2051 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
2052 |
} |
2053 |
|
2054 |
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
2055 |
cb, opaque); |
2056 |
|
2057 |
if (ret) {
|
2058 |
/* Update stats even though technically transfer has not happened. */
|
2059 |
bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
2060 |
bs->wr_ops ++; |
2061 |
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
2062 |
bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
2063 |
} |
2064 |
} |
2065 |
|
2066 |
return ret;
|
2067 |
} |
2068 |
|
2069 |
|
2070 |
typedef struct MultiwriteCB { |
2071 |
int error;
|
2072 |
int num_requests;
|
2073 |
int num_callbacks;
|
2074 |
struct {
|
2075 |
BlockDriverCompletionFunc *cb; |
2076 |
void *opaque;
|
2077 |
QEMUIOVector *free_qiov; |
2078 |
void *free_buf;
|
2079 |
} callbacks[]; |
2080 |
} MultiwriteCB; |
2081 |
|
2082 |
static void multiwrite_user_cb(MultiwriteCB *mcb) |
2083 |
{ |
2084 |
int i;
|
2085 |
|
2086 |
for (i = 0; i < mcb->num_callbacks; i++) { |
2087 |
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
2088 |
if (mcb->callbacks[i].free_qiov) {
|
2089 |
qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
2090 |
} |
2091 |
qemu_free(mcb->callbacks[i].free_qiov); |
2092 |
qemu_vfree(mcb->callbacks[i].free_buf); |
2093 |
} |
2094 |
} |
2095 |
|
2096 |
static void multiwrite_cb(void *opaque, int ret) |
2097 |
{ |
2098 |
MultiwriteCB *mcb = opaque; |
2099 |
|
2100 |
trace_multiwrite_cb(mcb, ret); |
2101 |
|
2102 |
if (ret < 0 && !mcb->error) { |
2103 |
mcb->error = ret; |
2104 |
} |
2105 |
|
2106 |
mcb->num_requests--; |
2107 |
if (mcb->num_requests == 0) { |
2108 |
multiwrite_user_cb(mcb); |
2109 |
qemu_free(mcb); |
2110 |
} |
2111 |
} |
2112 |
|
2113 |
static int multiwrite_req_compare(const void *a, const void *b) |
2114 |
{ |
2115 |
const BlockRequest *req1 = a, *req2 = b;
|
2116 |
|
2117 |
/*
|
2118 |
* Note that we can't simply subtract req2->sector from req1->sector
|
2119 |
* here as that could overflow the return value.
|
2120 |
*/
|
2121 |
if (req1->sector > req2->sector) {
|
2122 |
return 1; |
2123 |
} else if (req1->sector < req2->sector) { |
2124 |
return -1; |
2125 |
} else {
|
2126 |
return 0; |
2127 |
} |
2128 |
} |
2129 |
|
2130 |
/*
|
2131 |
* Takes a bunch of requests and tries to merge them. Returns the number of
|
2132 |
* requests that remain after merging.
|
2133 |
*/
|
2134 |
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
2135 |
int num_reqs, MultiwriteCB *mcb)
|
2136 |
{ |
2137 |
int i, outidx;
|
2138 |
|
2139 |
// Sort requests by start sector
|
2140 |
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
2141 |
|
2142 |
// Check if adjacent requests touch the same clusters. If so, combine them,
|
2143 |
// filling up gaps with zero sectors.
|
2144 |
outidx = 0;
|
2145 |
for (i = 1; i < num_reqs; i++) { |
2146 |
int merge = 0; |
2147 |
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
2148 |
|
2149 |
// This handles the cases that are valid for all block drivers, namely
|
2150 |
// exactly sequential writes and overlapping writes.
|
2151 |
if (reqs[i].sector <= oldreq_last) {
|
2152 |
merge = 1;
|
2153 |
} |
2154 |
|
2155 |
// The block driver may decide that it makes sense to combine requests
|
2156 |
// even if there is a gap of some sectors between them. In this case,
|
2157 |
// the gap is filled with zeros (therefore only applicable for yet
|
2158 |
// unused space in format like qcow2).
|
2159 |
if (!merge && bs->drv->bdrv_merge_requests) {
|
2160 |
merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
2161 |
} |
2162 |
|
2163 |
if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
2164 |
merge = 0;
|
2165 |
} |
2166 |
|
2167 |
if (merge) {
|
2168 |
size_t size; |
2169 |
QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
|
2170 |
qemu_iovec_init(qiov, |
2171 |
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
2172 |
|
2173 |
// Add the first request to the merged one. If the requests are
|
2174 |
// overlapping, drop the last sectors of the first request.
|
2175 |
size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
2176 |
qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
2177 |
|
2178 |
// We might need to add some zeros between the two requests
|
2179 |
if (reqs[i].sector > oldreq_last) {
|
2180 |
size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
|
2181 |
uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
2182 |
memset(buf, 0, zero_bytes);
|
2183 |
qemu_iovec_add(qiov, buf, zero_bytes); |
2184 |
mcb->callbacks[i].free_buf = buf; |
2185 |
} |
2186 |
|
2187 |
// Add the second request
|
2188 |
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
2189 |
|
2190 |
reqs[outidx].nb_sectors = qiov->size >> 9;
|
2191 |
reqs[outidx].qiov = qiov; |
2192 |
|
2193 |
mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
2194 |
} else {
|
2195 |
outidx++; |
2196 |
reqs[outidx].sector = reqs[i].sector; |
2197 |
reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
2198 |
reqs[outidx].qiov = reqs[i].qiov; |
2199 |
} |
2200 |
} |
2201 |
|
2202 |
return outidx + 1; |
2203 |
} |
2204 |
|
2205 |
/*
|
2206 |
* Submit multiple AIO write requests at once.
|
2207 |
*
|
2208 |
* On success, the function returns 0 and all requests in the reqs array have
|
2209 |
* been submitted. In error case this function returns -1, and any of the
|
2210 |
* requests may or may not be submitted yet. In particular, this means that the
|
2211 |
* callback will be called for some of the requests, for others it won't. The
|
2212 |
* caller must check the error field of the BlockRequest to wait for the right
|
2213 |
* callbacks (if error != 0, no callback will be called).
|
2214 |
*
|
2215 |
* The implementation may modify the contents of the reqs array, e.g. to merge
|
2216 |
* requests. However, the fields opaque and error are left unmodified as they
|
2217 |
* are used to signal failure for a single request to the caller.
|
2218 |
*/
|
2219 |
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
2220 |
{ |
2221 |
BlockDriverAIOCB *acb; |
2222 |
MultiwriteCB *mcb; |
2223 |
int i;
|
2224 |
|
2225 |
if (num_reqs == 0) { |
2226 |
return 0; |
2227 |
} |
2228 |
|
2229 |
// Create MultiwriteCB structure
|
2230 |
mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
2231 |
mcb->num_requests = 0;
|
2232 |
mcb->num_callbacks = num_reqs; |
2233 |
|
2234 |
for (i = 0; i < num_reqs; i++) { |
2235 |
mcb->callbacks[i].cb = reqs[i].cb; |
2236 |
mcb->callbacks[i].opaque = reqs[i].opaque; |
2237 |
} |
2238 |
|
2239 |
// Check for mergable requests
|
2240 |
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
2241 |
|
2242 |
trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
2243 |
|
2244 |
/*
|
2245 |
* Run the aio requests. As soon as one request can't be submitted
|
2246 |
* successfully, fail all requests that are not yet submitted (we must
|
2247 |
* return failure for all requests anyway)
|
2248 |
*
|
2249 |
* num_requests cannot be set to the right value immediately: If
|
2250 |
* bdrv_aio_writev fails for some request, num_requests would be too high
|
2251 |
* and therefore multiwrite_cb() would never recognize the multiwrite
|
2252 |
* request as completed. We also cannot use the loop variable i to set it
|
2253 |
* when the first request fails because the callback may already have been
|
2254 |
* called for previously submitted requests. Thus, num_requests must be
|
2255 |
* incremented for each request that is submitted.
|
2256 |
*
|
2257 |
* The problem that callbacks may be called early also means that we need
|
2258 |
* to take care that num_requests doesn't become 0 before all requests are
|
2259 |
* submitted - multiwrite_cb() would consider the multiwrite request
|
2260 |
* completed. A dummy request that is "completed" by a manual call to
|
2261 |
* multiwrite_cb() takes care of this.
|
2262 |
*/
|
2263 |
mcb->num_requests = 1;
|
2264 |
|
2265 |
// Run the aio requests
|
2266 |
for (i = 0; i < num_reqs; i++) { |
2267 |
mcb->num_requests++; |
2268 |
acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
2269 |
reqs[i].nb_sectors, multiwrite_cb, mcb); |
2270 |
|
2271 |
if (acb == NULL) { |
2272 |
// We can only fail the whole thing if no request has been
|
2273 |
// submitted yet. Otherwise we'll wait for the submitted AIOs to
|
2274 |
// complete and report the error in the callback.
|
2275 |
if (i == 0) { |
2276 |
trace_bdrv_aio_multiwrite_earlyfail(mcb); |
2277 |
goto fail;
|
2278 |
} else {
|
2279 |
trace_bdrv_aio_multiwrite_latefail(mcb, i); |
2280 |
multiwrite_cb(mcb, -EIO); |
2281 |
break;
|
2282 |
} |
2283 |
} |
2284 |
} |
2285 |
|
2286 |
/* Complete the dummy request */
|
2287 |
multiwrite_cb(mcb, 0);
|
2288 |
|
2289 |
return 0; |
2290 |
|
2291 |
fail:
|
2292 |
for (i = 0; i < mcb->num_callbacks; i++) { |
2293 |
reqs[i].error = -EIO; |
2294 |
} |
2295 |
qemu_free(mcb); |
2296 |
return -1; |
2297 |
} |
2298 |
|
2299 |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
2300 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2301 |
{ |
2302 |
BlockDriver *drv = bs->drv; |
2303 |
|
2304 |
if (bs->open_flags & BDRV_O_NO_FLUSH) {
|
2305 |
return bdrv_aio_noop_em(bs, cb, opaque);
|
2306 |
} |
2307 |
|
2308 |
if (!drv)
|
2309 |
return NULL; |
2310 |
return drv->bdrv_aio_flush(bs, cb, opaque);
|
2311 |
} |
2312 |
|
2313 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
2314 |
{ |
2315 |
acb->pool->cancel(acb); |
2316 |
} |
2317 |
|
2318 |
|
2319 |
/**************************************************************/
|
2320 |
/* async block device emulation */
|
2321 |
|
2322 |
typedef struct BlockDriverAIOCBSync { |
2323 |
BlockDriverAIOCB common; |
2324 |
QEMUBH *bh; |
2325 |
int ret;
|
2326 |
/* vector translation state */
|
2327 |
QEMUIOVector *qiov; |
2328 |
uint8_t *bounce; |
2329 |
int is_write;
|
2330 |
} BlockDriverAIOCBSync; |
2331 |
|
2332 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
2333 |
{ |
2334 |
BlockDriverAIOCBSync *acb = |
2335 |
container_of(blockacb, BlockDriverAIOCBSync, common); |
2336 |
qemu_bh_delete(acb->bh); |
2337 |
acb->bh = NULL;
|
2338 |
qemu_aio_release(acb); |
2339 |
} |
2340 |
|
2341 |
static AIOPool bdrv_em_aio_pool = {
|
2342 |
.aiocb_size = sizeof(BlockDriverAIOCBSync),
|
2343 |
.cancel = bdrv_aio_cancel_em, |
2344 |
}; |
2345 |
|
2346 |
static void bdrv_aio_bh_cb(void *opaque) |
2347 |
{ |
2348 |
BlockDriverAIOCBSync *acb = opaque; |
2349 |
|
2350 |
if (!acb->is_write)
|
2351 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
2352 |
qemu_vfree(acb->bounce); |
2353 |
acb->common.cb(acb->common.opaque, acb->ret); |
2354 |
qemu_bh_delete(acb->bh); |
2355 |
acb->bh = NULL;
|
2356 |
qemu_aio_release(acb); |
2357 |
} |
2358 |
|
2359 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
2360 |
int64_t sector_num, |
2361 |
QEMUIOVector *qiov, |
2362 |
int nb_sectors,
|
2363 |
BlockDriverCompletionFunc *cb, |
2364 |
void *opaque,
|
2365 |
int is_write)
|
2366 |
|
2367 |
{ |
2368 |
BlockDriverAIOCBSync *acb; |
2369 |
|
2370 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
2371 |
acb->is_write = is_write; |
2372 |
acb->qiov = qiov; |
2373 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
2374 |
|
2375 |
if (!acb->bh)
|
2376 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
2377 |
|
2378 |
if (is_write) {
|
2379 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
2380 |
acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
2381 |
} else {
|
2382 |
acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
2383 |
} |
2384 |
|
2385 |
qemu_bh_schedule(acb->bh); |
2386 |
|
2387 |
return &acb->common;
|
2388 |
} |
2389 |
|
2390 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
2391 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
2392 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2393 |
{ |
2394 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
2395 |
} |
2396 |
|
2397 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
2398 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
2399 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2400 |
{ |
2401 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
2402 |
} |
2403 |
|
2404 |
static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
2405 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2406 |
{ |
2407 |
BlockDriverAIOCBSync *acb; |
2408 |
|
2409 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
2410 |
acb->is_write = 1; /* don't bounce in the completion hadler */ |
2411 |
acb->qiov = NULL;
|
2412 |
acb->bounce = NULL;
|
2413 |
acb->ret = 0;
|
2414 |
|
2415 |
if (!acb->bh)
|
2416 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
2417 |
|
2418 |
bdrv_flush(bs); |
2419 |
qemu_bh_schedule(acb->bh); |
2420 |
return &acb->common;
|
2421 |
} |
2422 |
|
2423 |
static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
|
2424 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2425 |
{ |
2426 |
BlockDriverAIOCBSync *acb; |
2427 |
|
2428 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
2429 |
acb->is_write = 1; /* don't bounce in the completion handler */ |
2430 |
acb->qiov = NULL;
|
2431 |
acb->bounce = NULL;
|
2432 |
acb->ret = 0;
|
2433 |
|
2434 |
if (!acb->bh) {
|
2435 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
2436 |
} |
2437 |
|
2438 |
qemu_bh_schedule(acb->bh); |
2439 |
return &acb->common;
|
2440 |
} |
2441 |
|
2442 |
/**************************************************************/
|
2443 |
/* sync block device emulation */
|
2444 |
|
2445 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
2446 |
{ |
2447 |
*(int *)opaque = ret;
|
2448 |
} |
2449 |
|
2450 |
#define NOT_DONE 0x7fffffff |
2451 |
|
2452 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
2453 |
uint8_t *buf, int nb_sectors)
|
2454 |
{ |
2455 |
int async_ret;
|
2456 |
BlockDriverAIOCB *acb; |
2457 |
struct iovec iov;
|
2458 |
QEMUIOVector qiov; |
2459 |
|
2460 |
async_context_push(); |
2461 |
|
2462 |
async_ret = NOT_DONE; |
2463 |
iov.iov_base = (void *)buf;
|
2464 |
iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
2465 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
2466 |
acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
2467 |
bdrv_rw_em_cb, &async_ret); |
2468 |
if (acb == NULL) { |
2469 |
async_ret = -1;
|
2470 |
goto fail;
|
2471 |
} |
2472 |
|
2473 |
while (async_ret == NOT_DONE) {
|
2474 |
qemu_aio_wait(); |
2475 |
} |
2476 |
|
2477 |
|
2478 |
fail:
|
2479 |
async_context_pop(); |
2480 |
return async_ret;
|
2481 |
} |
2482 |
|
2483 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
2484 |
const uint8_t *buf, int nb_sectors) |
2485 |
{ |
2486 |
int async_ret;
|
2487 |
BlockDriverAIOCB *acb; |
2488 |
struct iovec iov;
|
2489 |
QEMUIOVector qiov; |
2490 |
|
2491 |
async_context_push(); |
2492 |
|
2493 |
async_ret = NOT_DONE; |
2494 |
iov.iov_base = (void *)buf;
|
2495 |
iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
2496 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
2497 |
acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
2498 |
bdrv_rw_em_cb, &async_ret); |
2499 |
if (acb == NULL) { |
2500 |
async_ret = -1;
|
2501 |
goto fail;
|
2502 |
} |
2503 |
while (async_ret == NOT_DONE) {
|
2504 |
qemu_aio_wait(); |
2505 |
} |
2506 |
|
2507 |
fail:
|
2508 |
async_context_pop(); |
2509 |
return async_ret;
|
2510 |
} |
2511 |
|
2512 |
void bdrv_init(void) |
2513 |
{ |
2514 |
module_call_init(MODULE_INIT_BLOCK); |
2515 |
} |
2516 |
|
2517 |
void bdrv_init_with_whitelist(void) |
2518 |
{ |
2519 |
use_bdrv_whitelist = 1;
|
2520 |
bdrv_init(); |
2521 |
} |
2522 |
|
2523 |
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
2524 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2525 |
{ |
2526 |
BlockDriverAIOCB *acb; |
2527 |
|
2528 |
if (pool->free_aiocb) {
|
2529 |
acb = pool->free_aiocb; |
2530 |
pool->free_aiocb = acb->next; |
2531 |
} else {
|
2532 |
acb = qemu_mallocz(pool->aiocb_size); |
2533 |
acb->pool = pool; |
2534 |
} |
2535 |
acb->bs = bs; |
2536 |
acb->cb = cb; |
2537 |
acb->opaque = opaque; |
2538 |
return acb;
|
2539 |
} |
2540 |
|
2541 |
void qemu_aio_release(void *p) |
2542 |
{ |
2543 |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
2544 |
AIOPool *pool = acb->pool; |
2545 |
acb->next = pool->free_aiocb; |
2546 |
pool->free_aiocb = acb; |
2547 |
} |
2548 |
|
2549 |
/**************************************************************/
|
2550 |
/* removable device support */
|
2551 |
|
2552 |
/**
|
2553 |
* Return TRUE if the media is present
|
2554 |
*/
|
2555 |
int bdrv_is_inserted(BlockDriverState *bs)
|
2556 |
{ |
2557 |
BlockDriver *drv = bs->drv; |
2558 |
int ret;
|
2559 |
if (!drv)
|
2560 |
return 0; |
2561 |
if (!drv->bdrv_is_inserted)
|
2562 |
return !bs->tray_open;
|
2563 |
ret = drv->bdrv_is_inserted(bs); |
2564 |
return ret;
|
2565 |
} |
2566 |
|
2567 |
/**
|
2568 |
* Return TRUE if the media changed since the last call to this
|
2569 |
* function. It is currently only used for floppy disks
|
2570 |
*/
|
2571 |
int bdrv_media_changed(BlockDriverState *bs)
|
2572 |
{ |
2573 |
BlockDriver *drv = bs->drv; |
2574 |
int ret;
|
2575 |
|
2576 |
if (!drv || !drv->bdrv_media_changed)
|
2577 |
ret = -ENOTSUP; |
2578 |
else
|
2579 |
ret = drv->bdrv_media_changed(bs); |
2580 |
if (ret == -ENOTSUP)
|
2581 |
ret = bs->media_changed; |
2582 |
bs->media_changed = 0;
|
2583 |
return ret;
|
2584 |
} |
2585 |
|
2586 |
/**
|
2587 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
2588 |
*/
|
2589 |
int bdrv_eject(BlockDriverState *bs, int eject_flag) |
2590 |
{ |
2591 |
BlockDriver *drv = bs->drv; |
2592 |
int ret;
|
2593 |
|
2594 |
if (bs->locked) {
|
2595 |
return -EBUSY;
|
2596 |
} |
2597 |
|
2598 |
if (!drv || !drv->bdrv_eject) {
|
2599 |
ret = -ENOTSUP; |
2600 |
} else {
|
2601 |
ret = drv->bdrv_eject(bs, eject_flag); |
2602 |
} |
2603 |
if (ret == -ENOTSUP) {
|
2604 |
ret = 0;
|
2605 |
} |
2606 |
if (ret >= 0) { |
2607 |
bs->tray_open = eject_flag; |
2608 |
} |
2609 |
|
2610 |
return ret;
|
2611 |
} |
2612 |
|
2613 |
int bdrv_is_locked(BlockDriverState *bs)
|
2614 |
{ |
2615 |
return bs->locked;
|
2616 |
} |
2617 |
|
2618 |
/**
|
2619 |
* Lock or unlock the media (if it is locked, the user won't be able
|
2620 |
* to eject it manually).
|
2621 |
*/
|
2622 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
2623 |
{ |
2624 |
BlockDriver *drv = bs->drv; |
2625 |
|
2626 |
bs->locked = locked; |
2627 |
if (drv && drv->bdrv_set_locked) {
|
2628 |
drv->bdrv_set_locked(bs, locked); |
2629 |
} |
2630 |
} |
2631 |
|
2632 |
/* needed for generic scsi interface */
|
2633 |
|
2634 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
2635 |
{ |
2636 |
BlockDriver *drv = bs->drv; |
2637 |
|
2638 |
if (drv && drv->bdrv_ioctl)
|
2639 |
return drv->bdrv_ioctl(bs, req, buf);
|
2640 |
return -ENOTSUP;
|
2641 |
} |
2642 |
|
2643 |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
2644 |
unsigned long int req, void *buf, |
2645 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2646 |
{ |
2647 |
BlockDriver *drv = bs->drv; |
2648 |
|
2649 |
if (drv && drv->bdrv_aio_ioctl)
|
2650 |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
2651 |
return NULL; |
2652 |
} |
2653 |
|
2654 |
|
2655 |
|
2656 |
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
2657 |
{ |
2658 |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
2659 |
} |
2660 |
|
2661 |
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
2662 |
{ |
2663 |
int64_t bitmap_size; |
2664 |
|
2665 |
bs->dirty_count = 0;
|
2666 |
if (enable) {
|
2667 |
if (!bs->dirty_bitmap) {
|
2668 |
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
2669 |
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
2670 |
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
|
2671 |
|
2672 |
bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
2673 |
} |
2674 |
} else {
|
2675 |
if (bs->dirty_bitmap) {
|
2676 |
qemu_free(bs->dirty_bitmap); |
2677 |
bs->dirty_bitmap = NULL;
|
2678 |
} |
2679 |
} |
2680 |
} |
2681 |
|
2682 |
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
|
2683 |
{ |
2684 |
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
2685 |
|
2686 |
if (bs->dirty_bitmap &&
|
2687 |
(sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { |
2688 |
return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
2689 |
(1UL << (chunk % (sizeof(unsigned long) * 8)))); |
2690 |
} else {
|
2691 |
return 0; |
2692 |
} |
2693 |
} |
2694 |
|
2695 |
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
|
2696 |
int nr_sectors)
|
2697 |
{ |
2698 |
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
|
2699 |
} |
2700 |
|
2701 |
int64_t bdrv_get_dirty_count(BlockDriverState *bs) |
2702 |
{ |
2703 |
return bs->dirty_count;
|
2704 |
} |