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/*
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|---|---|
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
|
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
|
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config-host.h" |
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#include "qemu-common.h" |
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#include "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 "qjson.h" |
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#include "qemu-coroutine.h" |
| 32 |
#include "qmp-commands.h" |
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#include "qemu-timer.h" |
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|
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#ifdef CONFIG_BSD
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <sys/ioctl.h> |
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#include <sys/queue.h> |
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#ifndef __DragonFly__
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#include <sys/disk.h> |
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#endif
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#endif
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|
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#ifdef _WIN32
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#include <windows.h> |
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#endif
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|
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#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
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|
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typedef enum { |
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BDRV_REQ_COPY_ON_READ = 0x1,
|
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} BdrvRequestFlags; |
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|
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static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load); |
| 56 |
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 int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
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int64_t sector_num, int nb_sectors,
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QEMUIOVector *iov); |
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static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, |
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int64_t sector_num, int nb_sectors,
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QEMUIOVector *iov); |
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static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
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BdrvRequestFlags flags); |
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static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
|
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static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs,
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int64_t sector_num, |
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QEMUIOVector *qiov, |
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int nb_sectors,
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BlockDriverCompletionFunc *cb, |
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void *opaque,
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bool is_write);
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static void coroutine_fn bdrv_co_do_rw(void *opaque); |
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|
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static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, |
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bool is_write, double elapsed_time, uint64_t *wait); |
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static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, |
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double elapsed_time, uint64_t *wait);
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static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, |
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bool is_write, int64_t *wait);
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|
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static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
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QTAILQ_HEAD_INITIALIZER(bdrv_states); |
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|
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static QLIST_HEAD(, BlockDriver) bdrv_drivers =
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QLIST_HEAD_INITIALIZER(bdrv_drivers); |
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|
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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; |
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#ifdef _WIN32
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static int is_windows_drive_prefix(const char *filename) |
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{
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return (((filename[0] >= 'a' && filename[0] <= 'z') || |
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(filename[0] >= 'A' && filename[0] <= 'Z')) && |
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filename[1] == ':'); |
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} |
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|
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int is_windows_drive(const char *filename) |
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{
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if (is_windows_drive_prefix(filename) &&
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filename[2] == '\0') |
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return 1; |
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if (strstart(filename, "\\\\.\\", NULL) || |
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strstart(filename, "//./", NULL)) |
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return 1; |
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return 0; |
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} |
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#endif
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|
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/* throttling disk I/O limits */
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void bdrv_io_limits_disable(BlockDriverState *bs)
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{
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bs->io_limits_enabled = false;
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|
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while (qemu_co_queue_next(&bs->throttled_reqs));
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|
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if (bs->block_timer) {
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qemu_del_timer(bs->block_timer); |
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qemu_free_timer(bs->block_timer); |
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bs->block_timer = NULL;
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} |
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bs->slice_start = 0;
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bs->slice_end = 0;
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bs->slice_time = 0;
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memset(&bs->io_base, 0, sizeof(bs->io_base)); |
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} |
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|
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static void bdrv_block_timer(void *opaque) |
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{
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BlockDriverState *bs = opaque; |
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|
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qemu_co_queue_next(&bs->throttled_reqs); |
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} |
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|
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void bdrv_io_limits_enable(BlockDriverState *bs)
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{
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qemu_co_queue_init(&bs->throttled_reqs); |
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bs->block_timer = qemu_new_timer_ns(vm_clock, bdrv_block_timer, bs); |
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bs->slice_time = 5 * BLOCK_IO_SLICE_TIME;
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bs->slice_start = qemu_get_clock_ns(vm_clock); |
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bs->slice_end = bs->slice_start + bs->slice_time; |
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memset(&bs->io_base, 0, sizeof(bs->io_base)); |
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bs->io_limits_enabled = true;
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} |
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|
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bool bdrv_io_limits_enabled(BlockDriverState *bs)
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{
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BlockIOLimit *io_limits = &bs->io_limits; |
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return io_limits->bps[BLOCK_IO_LIMIT_READ]
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|| io_limits->bps[BLOCK_IO_LIMIT_WRITE] |
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|| io_limits->bps[BLOCK_IO_LIMIT_TOTAL] |
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|| io_limits->iops[BLOCK_IO_LIMIT_READ] |
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|| io_limits->iops[BLOCK_IO_LIMIT_WRITE] |
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|| io_limits->iops[BLOCK_IO_LIMIT_TOTAL]; |
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} |
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|
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static void bdrv_io_limits_intercept(BlockDriverState *bs, |
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bool is_write, int nb_sectors) |
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{
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int64_t wait_time = -1;
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|
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if (!qemu_co_queue_empty(&bs->throttled_reqs)) {
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qemu_co_queue_wait(&bs->throttled_reqs); |
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} |
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/* In fact, we hope to keep each request's timing, in FIFO mode. The next
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* throttled requests will not be dequeued until the current request is
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* allowed to be serviced. So if the current request still exceeds the
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* limits, it will be inserted to the head. All requests followed it will
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* be still in throttled_reqs queue.
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*/
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while (bdrv_exceed_io_limits(bs, nb_sectors, is_write, &wait_time)) {
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qemu_mod_timer(bs->block_timer, |
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wait_time + qemu_get_clock_ns(vm_clock)); |
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qemu_co_queue_wait_insert_head(&bs->throttled_reqs); |
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} |
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qemu_co_queue_next(&bs->throttled_reqs); |
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} |
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|
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/* check if the path starts with "<protocol>:" */
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static int path_has_protocol(const char *path) |
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{
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#ifdef _WIN32
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if (is_windows_drive(path) ||
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is_windows_drive_prefix(path)) {
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return 0; |
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} |
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#endif
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return strchr(path, ':') != NULL; |
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} |
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|
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int path_is_absolute(const char *path) |
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{
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const char *p; |
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#ifdef _WIN32
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/* specific case for names like: "\\.\d:" */
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if (*path == '/' || *path == '\\') |
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return 1; |
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#endif
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p = strchr(path, ':');
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if (p)
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p++; |
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else
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p = path; |
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#ifdef _WIN32
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return (*p == '/' || *p == '\\'); |
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#else
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return (*p == '/'); |
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#endif
|
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} |
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|
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/* if filename is absolute, just copy it to dest. Otherwise, build a
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path to it by considering it is relative to base_path. URL are
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supported. */
|
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void path_combine(char *dest, int dest_size, |
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const char *base_path, |
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const char *filename) |
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{
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const char *p, *p1; |
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int len;
|
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|
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if (dest_size <= 0) |
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return;
|
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if (path_is_absolute(filename)) {
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pstrcpy(dest, dest_size, filename); |
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} else {
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p = strchr(base_path, ':');
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if (p)
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p++; |
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else
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p = base_path; |
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p1 = strrchr(base_path, '/');
|
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#ifdef _WIN32
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{
|
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const char *p2; |
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p2 = strrchr(base_path, '\\');
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if (!p1 || p2 > p1)
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p1 = p2; |
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} |
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#endif
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if (p1)
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p1++; |
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else
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p1 = base_path; |
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if (p1 > p)
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p = p1; |
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len = p - base_path; |
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if (len > dest_size - 1) |
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len = dest_size - 1;
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memcpy(dest, base_path, len); |
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dest[len] = '\0';
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pstrcat(dest, dest_size, filename); |
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} |
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} |
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|
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void bdrv_register(BlockDriver *bdrv)
|
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{
|
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/* Block drivers without coroutine functions need emulation */
|
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if (!bdrv->bdrv_co_readv) {
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bdrv->bdrv_co_readv = bdrv_co_readv_em; |
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bdrv->bdrv_co_writev = bdrv_co_writev_em; |
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|
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/* bdrv_co_readv_em()/brdv_co_writev_em() work in terms of aio, so if
|
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* the block driver lacks aio we need to emulate that too.
|
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*/
|
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if (!bdrv->bdrv_aio_readv) {
|
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/* add AIO emulation layer */
|
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bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
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bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
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} |
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} |
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|
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QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
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} |
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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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|
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bs = g_malloc0(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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bdrv_iostatus_disable(bs); |
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return bs;
|
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} |
| 304 |
|
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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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} |
| 312 |
} |
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return NULL; |
| 314 |
} |
| 315 |
|
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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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}; |
| 321 |
const char **p; |
| 322 |
|
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if (!whitelist[0]) |
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return 1; /* no whitelist, anything goes */ |
| 325 |
|
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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; |
| 329 |
} |
| 330 |
} |
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return 0; |
| 332 |
} |
| 333 |
|
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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; |
| 338 |
} |
| 339 |
|
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int bdrv_create(BlockDriver *drv, const char* filename, |
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QEMUOptionParameter *options) |
| 342 |
{
|
| 343 |
if (!drv->bdrv_create)
|
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return -ENOTSUP;
|
| 345 |
|
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return drv->bdrv_create(filename, options);
|
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} |
| 348 |
|
| 349 |
int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
| 350 |
{
|
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BlockDriver *drv; |
| 352 |
|
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drv = bdrv_find_protocol(filename); |
| 354 |
if (drv == NULL) { |
| 355 |
return -ENOENT;
|
| 356 |
} |
| 357 |
|
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return bdrv_create(drv, filename, options);
|
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} |
| 360 |
|
| 361 |
#ifdef _WIN32
|
| 362 |
void get_tmp_filename(char *filename, int size) |
| 363 |
{
|
| 364 |
char temp_dir[MAX_PATH];
|
| 365 |
|
| 366 |
GetTempPath(MAX_PATH, temp_dir); |
| 367 |
GetTempFileName(temp_dir, "qem", 0, filename); |
| 368 |
} |
| 369 |
#else
|
| 370 |
void get_tmp_filename(char *filename, int size) |
| 371 |
{
|
| 372 |
int fd;
|
| 373 |
const char *tmpdir; |
| 374 |
/* XXX: race condition possible */
|
| 375 |
tmpdir = getenv("TMPDIR");
|
| 376 |
if (!tmpdir)
|
| 377 |
tmpdir = "/tmp";
|
| 378 |
snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
|
| 379 |
fd = mkstemp(filename); |
| 380 |
close(fd); |
| 381 |
} |
| 382 |
#endif
|
| 383 |
|
| 384 |
/*
|
| 385 |
* Detect host devices. By convention, /dev/cdrom[N] is always
|
| 386 |
* recognized as a host CDROM.
|
| 387 |
*/
|
| 388 |
static BlockDriver *find_hdev_driver(const char *filename) |
| 389 |
{
|
| 390 |
int score_max = 0, score; |
| 391 |
BlockDriver *drv = NULL, *d;
|
| 392 |
|
| 393 |
QLIST_FOREACH(d, &bdrv_drivers, list) {
|
| 394 |
if (d->bdrv_probe_device) {
|
| 395 |
score = d->bdrv_probe_device(filename); |
| 396 |
if (score > score_max) {
|
| 397 |
score_max = score; |
| 398 |
drv = d; |
| 399 |
} |
| 400 |
} |
| 401 |
} |
| 402 |
|
| 403 |
return drv;
|
| 404 |
} |
| 405 |
|
| 406 |
BlockDriver *bdrv_find_protocol(const char *filename) |
| 407 |
{
|
| 408 |
BlockDriver *drv1; |
| 409 |
char protocol[128]; |
| 410 |
int len;
|
| 411 |
const char *p; |
| 412 |
|
| 413 |
/* TODO Drivers without bdrv_file_open must be specified explicitly */
|
| 414 |
|
| 415 |
/*
|
| 416 |
* XXX(hch): we really should not let host device detection
|
| 417 |
* override an explicit protocol specification, but moving this
|
| 418 |
* later breaks access to device names with colons in them.
|
| 419 |
* Thanks to the brain-dead persistent naming schemes on udev-
|
| 420 |
* based Linux systems those actually are quite common.
|
| 421 |
*/
|
| 422 |
drv1 = find_hdev_driver(filename); |
| 423 |
if (drv1) {
|
| 424 |
return drv1;
|
| 425 |
} |
| 426 |
|
| 427 |
if (!path_has_protocol(filename)) {
|
| 428 |
return bdrv_find_format("file"); |
| 429 |
} |
| 430 |
p = strchr(filename, ':');
|
| 431 |
assert(p != NULL);
|
| 432 |
len = p - filename; |
| 433 |
if (len > sizeof(protocol) - 1) |
| 434 |
len = sizeof(protocol) - 1; |
| 435 |
memcpy(protocol, filename, len); |
| 436 |
protocol[len] = '\0';
|
| 437 |
QLIST_FOREACH(drv1, &bdrv_drivers, list) {
|
| 438 |
if (drv1->protocol_name &&
|
| 439 |
!strcmp(drv1->protocol_name, protocol)) {
|
| 440 |
return drv1;
|
| 441 |
} |
| 442 |
} |
| 443 |
return NULL; |
| 444 |
} |
| 445 |
|
| 446 |
static int find_image_format(const char *filename, BlockDriver **pdrv) |
| 447 |
{
|
| 448 |
int ret, score, score_max;
|
| 449 |
BlockDriver *drv1, *drv; |
| 450 |
uint8_t buf[2048];
|
| 451 |
BlockDriverState *bs; |
| 452 |
|
| 453 |
ret = bdrv_file_open(&bs, filename, 0);
|
| 454 |
if (ret < 0) { |
| 455 |
*pdrv = NULL;
|
| 456 |
return ret;
|
| 457 |
} |
| 458 |
|
| 459 |
/* Return the raw BlockDriver * to scsi-generic devices or empty drives */
|
| 460 |
if (bs->sg || !bdrv_is_inserted(bs)) {
|
| 461 |
bdrv_delete(bs); |
| 462 |
drv = bdrv_find_format("raw");
|
| 463 |
if (!drv) {
|
| 464 |
ret = -ENOENT; |
| 465 |
} |
| 466 |
*pdrv = drv; |
| 467 |
return ret;
|
| 468 |
} |
| 469 |
|
| 470 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
| 471 |
bdrv_delete(bs); |
| 472 |
if (ret < 0) { |
| 473 |
*pdrv = NULL;
|
| 474 |
return ret;
|
| 475 |
} |
| 476 |
|
| 477 |
score_max = 0;
|
| 478 |
drv = NULL;
|
| 479 |
QLIST_FOREACH(drv1, &bdrv_drivers, list) {
|
| 480 |
if (drv1->bdrv_probe) {
|
| 481 |
score = drv1->bdrv_probe(buf, ret, filename); |
| 482 |
if (score > score_max) {
|
| 483 |
score_max = score; |
| 484 |
drv = drv1; |
| 485 |
} |
| 486 |
} |
| 487 |
} |
| 488 |
if (!drv) {
|
| 489 |
ret = -ENOENT; |
| 490 |
} |
| 491 |
*pdrv = drv; |
| 492 |
return ret;
|
| 493 |
} |
| 494 |
|
| 495 |
/**
|
| 496 |
* Set the current 'total_sectors' value
|
| 497 |
*/
|
| 498 |
static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
| 499 |
{
|
| 500 |
BlockDriver *drv = bs->drv; |
| 501 |
|
| 502 |
/* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
|
| 503 |
if (bs->sg)
|
| 504 |
return 0; |
| 505 |
|
| 506 |
/* query actual device if possible, otherwise just trust the hint */
|
| 507 |
if (drv->bdrv_getlength) {
|
| 508 |
int64_t length = drv->bdrv_getlength(bs); |
| 509 |
if (length < 0) { |
| 510 |
return length;
|
| 511 |
} |
| 512 |
hint = length >> BDRV_SECTOR_BITS; |
| 513 |
} |
| 514 |
|
| 515 |
bs->total_sectors = hint; |
| 516 |
return 0; |
| 517 |
} |
| 518 |
|
| 519 |
/**
|
| 520 |
* Set open flags for a given cache mode
|
| 521 |
*
|
| 522 |
* Return 0 on success, -1 if the cache mode was invalid.
|
| 523 |
*/
|
| 524 |
int bdrv_parse_cache_flags(const char *mode, int *flags) |
| 525 |
{
|
| 526 |
*flags &= ~BDRV_O_CACHE_MASK; |
| 527 |
|
| 528 |
if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
| 529 |
*flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; |
| 530 |
} else if (!strcmp(mode, "directsync")) { |
| 531 |
*flags |= BDRV_O_NOCACHE; |
| 532 |
} else if (!strcmp(mode, "writeback")) { |
| 533 |
*flags |= BDRV_O_CACHE_WB; |
| 534 |
} else if (!strcmp(mode, "unsafe")) { |
| 535 |
*flags |= BDRV_O_CACHE_WB; |
| 536 |
*flags |= BDRV_O_NO_FLUSH; |
| 537 |
} else if (!strcmp(mode, "writethrough")) { |
| 538 |
/* this is the default */
|
| 539 |
} else {
|
| 540 |
return -1; |
| 541 |
} |
| 542 |
|
| 543 |
return 0; |
| 544 |
} |
| 545 |
|
| 546 |
/**
|
| 547 |
* The copy-on-read flag is actually a reference count so multiple users may
|
| 548 |
* use the feature without worrying about clobbering its previous state.
|
| 549 |
* Copy-on-read stays enabled until all users have called to disable it.
|
| 550 |
*/
|
| 551 |
void bdrv_enable_copy_on_read(BlockDriverState *bs)
|
| 552 |
{
|
| 553 |
bs->copy_on_read++; |
| 554 |
} |
| 555 |
|
| 556 |
void bdrv_disable_copy_on_read(BlockDriverState *bs)
|
| 557 |
{
|
| 558 |
assert(bs->copy_on_read > 0);
|
| 559 |
bs->copy_on_read--; |
| 560 |
} |
| 561 |
|
| 562 |
/*
|
| 563 |
* Common part for opening disk images and files
|
| 564 |
*/
|
| 565 |
static int bdrv_open_common(BlockDriverState *bs, const char *filename, |
| 566 |
int flags, BlockDriver *drv)
|
| 567 |
{
|
| 568 |
int ret, open_flags;
|
| 569 |
|
| 570 |
assert(drv != NULL);
|
| 571 |
|
| 572 |
trace_bdrv_open_common(bs, filename, flags, drv->format_name); |
| 573 |
|
| 574 |
bs->file = NULL;
|
| 575 |
bs->total_sectors = 0;
|
| 576 |
bs->encrypted = 0;
|
| 577 |
bs->valid_key = 0;
|
| 578 |
bs->sg = 0;
|
| 579 |
bs->open_flags = flags; |
| 580 |
bs->growable = 0;
|
| 581 |
bs->buffer_alignment = 512;
|
| 582 |
|
| 583 |
assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
| 584 |
if ((flags & BDRV_O_RDWR) && (flags & BDRV_O_COPY_ON_READ)) {
|
| 585 |
bdrv_enable_copy_on_read(bs); |
| 586 |
} |
| 587 |
|
| 588 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
| 589 |
bs->backing_file[0] = '\0'; |
| 590 |
|
| 591 |
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
|
| 592 |
return -ENOTSUP;
|
| 593 |
} |
| 594 |
|
| 595 |
bs->drv = drv; |
| 596 |
bs->opaque = g_malloc0(drv->instance_size); |
| 597 |
|
| 598 |
bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
| 599 |
|
| 600 |
/*
|
| 601 |
* Clear flags that are internal to the block layer before opening the
|
| 602 |
* image.
|
| 603 |
*/
|
| 604 |
open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
| 605 |
|
| 606 |
/*
|
| 607 |
* Snapshots should be writable.
|
| 608 |
*/
|
| 609 |
if (bs->is_temporary) {
|
| 610 |
open_flags |= BDRV_O_RDWR; |
| 611 |
} |
| 612 |
|
| 613 |
bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
| 614 |
|
| 615 |
/* Open the image, either directly or using a protocol */
|
| 616 |
if (drv->bdrv_file_open) {
|
| 617 |
ret = drv->bdrv_file_open(bs, filename, open_flags); |
| 618 |
} else {
|
| 619 |
ret = bdrv_file_open(&bs->file, filename, open_flags); |
| 620 |
if (ret >= 0) { |
| 621 |
ret = drv->bdrv_open(bs, open_flags); |
| 622 |
} |
| 623 |
} |
| 624 |
|
| 625 |
if (ret < 0) { |
| 626 |
goto free_and_fail;
|
| 627 |
} |
| 628 |
|
| 629 |
ret = refresh_total_sectors(bs, bs->total_sectors); |
| 630 |
if (ret < 0) { |
| 631 |
goto free_and_fail;
|
| 632 |
} |
| 633 |
|
| 634 |
#ifndef _WIN32
|
| 635 |
if (bs->is_temporary) {
|
| 636 |
unlink(filename); |
| 637 |
} |
| 638 |
#endif
|
| 639 |
return 0; |
| 640 |
|
| 641 |
free_and_fail:
|
| 642 |
if (bs->file) {
|
| 643 |
bdrv_delete(bs->file); |
| 644 |
bs->file = NULL;
|
| 645 |
} |
| 646 |
g_free(bs->opaque); |
| 647 |
bs->opaque = NULL;
|
| 648 |
bs->drv = NULL;
|
| 649 |
return ret;
|
| 650 |
} |
| 651 |
|
| 652 |
/*
|
| 653 |
* Opens a file using a protocol (file, host_device, nbd, ...)
|
| 654 |
*/
|
| 655 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
| 656 |
{
|
| 657 |
BlockDriverState *bs; |
| 658 |
BlockDriver *drv; |
| 659 |
int ret;
|
| 660 |
|
| 661 |
drv = bdrv_find_protocol(filename); |
| 662 |
if (!drv) {
|
| 663 |
return -ENOENT;
|
| 664 |
} |
| 665 |
|
| 666 |
bs = bdrv_new("");
|
| 667 |
ret = bdrv_open_common(bs, filename, flags, drv); |
| 668 |
if (ret < 0) { |
| 669 |
bdrv_delete(bs); |
| 670 |
return ret;
|
| 671 |
} |
| 672 |
bs->growable = 1;
|
| 673 |
*pbs = bs; |
| 674 |
return 0; |
| 675 |
} |
| 676 |
|
| 677 |
/*
|
| 678 |
* Opens a disk image (raw, qcow2, vmdk, ...)
|
| 679 |
*/
|
| 680 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
| 681 |
BlockDriver *drv) |
| 682 |
{
|
| 683 |
int ret;
|
| 684 |
char tmp_filename[PATH_MAX];
|
| 685 |
|
| 686 |
if (flags & BDRV_O_SNAPSHOT) {
|
| 687 |
BlockDriverState *bs1; |
| 688 |
int64_t total_size; |
| 689 |
int is_protocol = 0; |
| 690 |
BlockDriver *bdrv_qcow2; |
| 691 |
QEMUOptionParameter *options; |
| 692 |
char backing_filename[PATH_MAX];
|
| 693 |
|
| 694 |
/* if snapshot, we create a temporary backing file and open it
|
| 695 |
instead of opening 'filename' directly */
|
| 696 |
|
| 697 |
/* if there is a backing file, use it */
|
| 698 |
bs1 = bdrv_new("");
|
| 699 |
ret = bdrv_open(bs1, filename, 0, drv);
|
| 700 |
if (ret < 0) { |
| 701 |
bdrv_delete(bs1); |
| 702 |
return ret;
|
| 703 |
} |
| 704 |
total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
| 705 |
|
| 706 |
if (bs1->drv && bs1->drv->protocol_name)
|
| 707 |
is_protocol = 1;
|
| 708 |
|
| 709 |
bdrv_delete(bs1); |
| 710 |
|
| 711 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
| 712 |
|
| 713 |
/* Real path is meaningless for protocols */
|
| 714 |
if (is_protocol)
|
| 715 |
snprintf(backing_filename, sizeof(backing_filename),
|
| 716 |
"%s", filename);
|
| 717 |
else if (!realpath(filename, backing_filename)) |
| 718 |
return -errno;
|
| 719 |
|
| 720 |
bdrv_qcow2 = bdrv_find_format("qcow2");
|
| 721 |
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
| 722 |
|
| 723 |
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
| 724 |
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
| 725 |
if (drv) {
|
| 726 |
set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
| 727 |
drv->format_name); |
| 728 |
} |
| 729 |
|
| 730 |
ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
| 731 |
free_option_parameters(options); |
| 732 |
if (ret < 0) { |
| 733 |
return ret;
|
| 734 |
} |
| 735 |
|
| 736 |
filename = tmp_filename; |
| 737 |
drv = bdrv_qcow2; |
| 738 |
bs->is_temporary = 1;
|
| 739 |
} |
| 740 |
|
| 741 |
/* Find the right image format driver */
|
| 742 |
if (!drv) {
|
| 743 |
ret = find_image_format(filename, &drv); |
| 744 |
} |
| 745 |
|
| 746 |
if (!drv) {
|
| 747 |
goto unlink_and_fail;
|
| 748 |
} |
| 749 |
|
| 750 |
/* Open the image */
|
| 751 |
ret = bdrv_open_common(bs, filename, flags, drv); |
| 752 |
if (ret < 0) { |
| 753 |
goto unlink_and_fail;
|
| 754 |
} |
| 755 |
|
| 756 |
/* If there is a backing file, use it */
|
| 757 |
if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { |
| 758 |
char backing_filename[PATH_MAX];
|
| 759 |
int back_flags;
|
| 760 |
BlockDriver *back_drv = NULL;
|
| 761 |
|
| 762 |
bs->backing_hd = bdrv_new("");
|
| 763 |
|
| 764 |
if (path_has_protocol(bs->backing_file)) {
|
| 765 |
pstrcpy(backing_filename, sizeof(backing_filename),
|
| 766 |
bs->backing_file); |
| 767 |
} else {
|
| 768 |
path_combine(backing_filename, sizeof(backing_filename),
|
| 769 |
filename, bs->backing_file); |
| 770 |
} |
| 771 |
|
| 772 |
if (bs->backing_format[0] != '\0') { |
| 773 |
back_drv = bdrv_find_format(bs->backing_format); |
| 774 |
} |
| 775 |
|
| 776 |
/* backing files always opened read-only */
|
| 777 |
back_flags = |
| 778 |
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
| 779 |
|
| 780 |
ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); |
| 781 |
if (ret < 0) { |
| 782 |
bdrv_close(bs); |
| 783 |
return ret;
|
| 784 |
} |
| 785 |
if (bs->is_temporary) {
|
| 786 |
bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); |
| 787 |
} else {
|
| 788 |
/* base image inherits from "parent" */
|
| 789 |
bs->backing_hd->keep_read_only = bs->keep_read_only; |
| 790 |
} |
| 791 |
} |
| 792 |
|
| 793 |
if (!bdrv_key_required(bs)) {
|
| 794 |
bdrv_dev_change_media_cb(bs, true);
|
| 795 |
} |
| 796 |
|
| 797 |
/* throttling disk I/O limits */
|
| 798 |
if (bs->io_limits_enabled) {
|
| 799 |
bdrv_io_limits_enable(bs); |
| 800 |
} |
| 801 |
|
| 802 |
return 0; |
| 803 |
|
| 804 |
unlink_and_fail:
|
| 805 |
if (bs->is_temporary) {
|
| 806 |
unlink(filename); |
| 807 |
} |
| 808 |
return ret;
|
| 809 |
} |
| 810 |
|
| 811 |
void bdrv_close(BlockDriverState *bs)
|
| 812 |
{
|
| 813 |
if (bs->drv) {
|
| 814 |
if (bs == bs_snapshots) {
|
| 815 |
bs_snapshots = NULL;
|
| 816 |
} |
| 817 |
if (bs->backing_hd) {
|
| 818 |
bdrv_delete(bs->backing_hd); |
| 819 |
bs->backing_hd = NULL;
|
| 820 |
} |
| 821 |
bs->drv->bdrv_close(bs); |
| 822 |
g_free(bs->opaque); |
| 823 |
#ifdef _WIN32
|
| 824 |
if (bs->is_temporary) {
|
| 825 |
unlink(bs->filename); |
| 826 |
} |
| 827 |
#endif
|
| 828 |
bs->opaque = NULL;
|
| 829 |
bs->drv = NULL;
|
| 830 |
bs->copy_on_read = 0;
|
| 831 |
|
| 832 |
if (bs->file != NULL) { |
| 833 |
bdrv_close(bs->file); |
| 834 |
} |
| 835 |
|
| 836 |
bdrv_dev_change_media_cb(bs, false);
|
| 837 |
} |
| 838 |
|
| 839 |
/*throttling disk I/O limits*/
|
| 840 |
if (bs->io_limits_enabled) {
|
| 841 |
bdrv_io_limits_disable(bs); |
| 842 |
} |
| 843 |
} |
| 844 |
|
| 845 |
void bdrv_close_all(void) |
| 846 |
{
|
| 847 |
BlockDriverState *bs; |
| 848 |
|
| 849 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 850 |
bdrv_close(bs); |
| 851 |
} |
| 852 |
} |
| 853 |
|
| 854 |
/*
|
| 855 |
* Wait for pending requests to complete across all BlockDriverStates
|
| 856 |
*
|
| 857 |
* This function does not flush data to disk, use bdrv_flush_all() for that
|
| 858 |
* after calling this function.
|
| 859 |
*/
|
| 860 |
void bdrv_drain_all(void) |
| 861 |
{
|
| 862 |
BlockDriverState *bs; |
| 863 |
|
| 864 |
qemu_aio_flush(); |
| 865 |
|
| 866 |
/* If requests are still pending there is a bug somewhere */
|
| 867 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 868 |
assert(QLIST_EMPTY(&bs->tracked_requests)); |
| 869 |
assert(qemu_co_queue_empty(&bs->throttled_reqs)); |
| 870 |
} |
| 871 |
} |
| 872 |
|
| 873 |
/* make a BlockDriverState anonymous by removing from bdrv_state list.
|
| 874 |
Also, NULL terminate the device_name to prevent double remove */
|
| 875 |
void bdrv_make_anon(BlockDriverState *bs)
|
| 876 |
{
|
| 877 |
if (bs->device_name[0] != '\0') { |
| 878 |
QTAILQ_REMOVE(&bdrv_states, bs, list); |
| 879 |
} |
| 880 |
bs->device_name[0] = '\0'; |
| 881 |
} |
| 882 |
|
| 883 |
void bdrv_delete(BlockDriverState *bs)
|
| 884 |
{
|
| 885 |
assert(!bs->dev); |
| 886 |
|
| 887 |
/* remove from list, if necessary */
|
| 888 |
bdrv_make_anon(bs); |
| 889 |
|
| 890 |
bdrv_close(bs); |
| 891 |
if (bs->file != NULL) { |
| 892 |
bdrv_delete(bs->file); |
| 893 |
} |
| 894 |
|
| 895 |
assert(bs != bs_snapshots); |
| 896 |
g_free(bs); |
| 897 |
} |
| 898 |
|
| 899 |
int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
| 900 |
/* TODO change to DeviceState *dev when all users are qdevified */
|
| 901 |
{
|
| 902 |
if (bs->dev) {
|
| 903 |
return -EBUSY;
|
| 904 |
} |
| 905 |
bs->dev = dev; |
| 906 |
bdrv_iostatus_reset(bs); |
| 907 |
return 0; |
| 908 |
} |
| 909 |
|
| 910 |
/* TODO qdevified devices don't use this, remove when devices are qdevified */
|
| 911 |
void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) |
| 912 |
{
|
| 913 |
if (bdrv_attach_dev(bs, dev) < 0) { |
| 914 |
abort(); |
| 915 |
} |
| 916 |
} |
| 917 |
|
| 918 |
void bdrv_detach_dev(BlockDriverState *bs, void *dev) |
| 919 |
/* TODO change to DeviceState *dev when all users are qdevified */
|
| 920 |
{
|
| 921 |
assert(bs->dev == dev); |
| 922 |
bs->dev = NULL;
|
| 923 |
bs->dev_ops = NULL;
|
| 924 |
bs->dev_opaque = NULL;
|
| 925 |
bs->buffer_alignment = 512;
|
| 926 |
} |
| 927 |
|
| 928 |
/* TODO change to return DeviceState * when all users are qdevified */
|
| 929 |
void *bdrv_get_attached_dev(BlockDriverState *bs)
|
| 930 |
{
|
| 931 |
return bs->dev;
|
| 932 |
} |
| 933 |
|
| 934 |
void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
| 935 |
void *opaque)
|
| 936 |
{
|
| 937 |
bs->dev_ops = ops; |
| 938 |
bs->dev_opaque = opaque; |
| 939 |
if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) {
|
| 940 |
bs_snapshots = NULL;
|
| 941 |
} |
| 942 |
} |
| 943 |
|
| 944 |
static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
| 945 |
{
|
| 946 |
if (bs->dev_ops && bs->dev_ops->change_media_cb) {
|
| 947 |
bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
| 948 |
} |
| 949 |
} |
| 950 |
|
| 951 |
bool bdrv_dev_has_removable_media(BlockDriverState *bs)
|
| 952 |
{
|
| 953 |
return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb);
|
| 954 |
} |
| 955 |
|
| 956 |
void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
| 957 |
{
|
| 958 |
if (bs->dev_ops && bs->dev_ops->eject_request_cb) {
|
| 959 |
bs->dev_ops->eject_request_cb(bs->dev_opaque, force); |
| 960 |
} |
| 961 |
} |
| 962 |
|
| 963 |
bool bdrv_dev_is_tray_open(BlockDriverState *bs)
|
| 964 |
{
|
| 965 |
if (bs->dev_ops && bs->dev_ops->is_tray_open) {
|
| 966 |
return bs->dev_ops->is_tray_open(bs->dev_opaque);
|
| 967 |
} |
| 968 |
return false; |
| 969 |
} |
| 970 |
|
| 971 |
static void bdrv_dev_resize_cb(BlockDriverState *bs) |
| 972 |
{
|
| 973 |
if (bs->dev_ops && bs->dev_ops->resize_cb) {
|
| 974 |
bs->dev_ops->resize_cb(bs->dev_opaque); |
| 975 |
} |
| 976 |
} |
| 977 |
|
| 978 |
bool bdrv_dev_is_medium_locked(BlockDriverState *bs)
|
| 979 |
{
|
| 980 |
if (bs->dev_ops && bs->dev_ops->is_medium_locked) {
|
| 981 |
return bs->dev_ops->is_medium_locked(bs->dev_opaque);
|
| 982 |
} |
| 983 |
return false; |
| 984 |
} |
| 985 |
|
| 986 |
/*
|
| 987 |
* Run consistency checks on an image
|
| 988 |
*
|
| 989 |
* Returns 0 if the check could be completed (it doesn't mean that the image is
|
| 990 |
* free of errors) or -errno when an internal error occurred. The results of the
|
| 991 |
* check are stored in res.
|
| 992 |
*/
|
| 993 |
int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res)
|
| 994 |
{
|
| 995 |
if (bs->drv->bdrv_check == NULL) { |
| 996 |
return -ENOTSUP;
|
| 997 |
} |
| 998 |
|
| 999 |
memset(res, 0, sizeof(*res)); |
| 1000 |
return bs->drv->bdrv_check(bs, res);
|
| 1001 |
} |
| 1002 |
|
| 1003 |
#define COMMIT_BUF_SECTORS 2048 |
| 1004 |
|
| 1005 |
/* commit COW file into the raw image */
|
| 1006 |
int bdrv_commit(BlockDriverState *bs)
|
| 1007 |
{
|
| 1008 |
BlockDriver *drv = bs->drv; |
| 1009 |
BlockDriver *backing_drv; |
| 1010 |
int64_t sector, total_sectors; |
| 1011 |
int n, ro, open_flags;
|
| 1012 |
int ret = 0, rw_ret = 0; |
| 1013 |
uint8_t *buf; |
| 1014 |
char filename[1024]; |
| 1015 |
BlockDriverState *bs_rw, *bs_ro; |
| 1016 |
|
| 1017 |
if (!drv)
|
| 1018 |
return -ENOMEDIUM;
|
| 1019 |
|
| 1020 |
if (!bs->backing_hd) {
|
| 1021 |
return -ENOTSUP;
|
| 1022 |
} |
| 1023 |
|
| 1024 |
if (bs->backing_hd->keep_read_only) {
|
| 1025 |
return -EACCES;
|
| 1026 |
} |
| 1027 |
|
| 1028 |
if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) {
|
| 1029 |
return -EBUSY;
|
| 1030 |
} |
| 1031 |
|
| 1032 |
backing_drv = bs->backing_hd->drv; |
| 1033 |
ro = bs->backing_hd->read_only; |
| 1034 |
strncpy(filename, bs->backing_hd->filename, sizeof(filename));
|
| 1035 |
open_flags = bs->backing_hd->open_flags; |
| 1036 |
|
| 1037 |
if (ro) {
|
| 1038 |
/* re-open as RW */
|
| 1039 |
bdrv_delete(bs->backing_hd); |
| 1040 |
bs->backing_hd = NULL;
|
| 1041 |
bs_rw = bdrv_new("");
|
| 1042 |
rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, |
| 1043 |
backing_drv); |
| 1044 |
if (rw_ret < 0) { |
| 1045 |
bdrv_delete(bs_rw); |
| 1046 |
/* try to re-open read-only */
|
| 1047 |
bs_ro = bdrv_new("");
|
| 1048 |
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
| 1049 |
backing_drv); |
| 1050 |
if (ret < 0) { |
| 1051 |
bdrv_delete(bs_ro); |
| 1052 |
/* drive not functional anymore */
|
| 1053 |
bs->drv = NULL;
|
| 1054 |
return ret;
|
| 1055 |
} |
| 1056 |
bs->backing_hd = bs_ro; |
| 1057 |
return rw_ret;
|
| 1058 |
} |
| 1059 |
bs->backing_hd = bs_rw; |
| 1060 |
} |
| 1061 |
|
| 1062 |
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
| 1063 |
buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
| 1064 |
|
| 1065 |
for (sector = 0; sector < total_sectors; sector += n) { |
| 1066 |
if (bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) {
|
| 1067 |
|
| 1068 |
if (bdrv_read(bs, sector, buf, n) != 0) { |
| 1069 |
ret = -EIO; |
| 1070 |
goto ro_cleanup;
|
| 1071 |
} |
| 1072 |
|
| 1073 |
if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { |
| 1074 |
ret = -EIO; |
| 1075 |
goto ro_cleanup;
|
| 1076 |
} |
| 1077 |
} |
| 1078 |
} |
| 1079 |
|
| 1080 |
if (drv->bdrv_make_empty) {
|
| 1081 |
ret = drv->bdrv_make_empty(bs); |
| 1082 |
bdrv_flush(bs); |
| 1083 |
} |
| 1084 |
|
| 1085 |
/*
|
| 1086 |
* Make sure all data we wrote to the backing device is actually
|
| 1087 |
* stable on disk.
|
| 1088 |
*/
|
| 1089 |
if (bs->backing_hd)
|
| 1090 |
bdrv_flush(bs->backing_hd); |
| 1091 |
|
| 1092 |
ro_cleanup:
|
| 1093 |
g_free(buf); |
| 1094 |
|
| 1095 |
if (ro) {
|
| 1096 |
/* re-open as RO */
|
| 1097 |
bdrv_delete(bs->backing_hd); |
| 1098 |
bs->backing_hd = NULL;
|
| 1099 |
bs_ro = bdrv_new("");
|
| 1100 |
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
| 1101 |
backing_drv); |
| 1102 |
if (ret < 0) { |
| 1103 |
bdrv_delete(bs_ro); |
| 1104 |
/* drive not functional anymore */
|
| 1105 |
bs->drv = NULL;
|
| 1106 |
return ret;
|
| 1107 |
} |
| 1108 |
bs->backing_hd = bs_ro; |
| 1109 |
bs->backing_hd->keep_read_only = 0;
|
| 1110 |
} |
| 1111 |
|
| 1112 |
return ret;
|
| 1113 |
} |
| 1114 |
|
| 1115 |
void bdrv_commit_all(void) |
| 1116 |
{
|
| 1117 |
BlockDriverState *bs; |
| 1118 |
|
| 1119 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 1120 |
bdrv_commit(bs); |
| 1121 |
} |
| 1122 |
} |
| 1123 |
|
| 1124 |
struct BdrvTrackedRequest {
|
| 1125 |
BlockDriverState *bs; |
| 1126 |
int64_t sector_num; |
| 1127 |
int nb_sectors;
|
| 1128 |
bool is_write;
|
| 1129 |
QLIST_ENTRY(BdrvTrackedRequest) list; |
| 1130 |
Coroutine *co; /* owner, used for deadlock detection */
|
| 1131 |
CoQueue wait_queue; /* coroutines blocked on this request */
|
| 1132 |
}; |
| 1133 |
|
| 1134 |
/**
|
| 1135 |
* Remove an active request from the tracked requests list
|
| 1136 |
*
|
| 1137 |
* This function should be called when a tracked request is completing.
|
| 1138 |
*/
|
| 1139 |
static void tracked_request_end(BdrvTrackedRequest *req) |
| 1140 |
{
|
| 1141 |
QLIST_REMOVE(req, list); |
| 1142 |
qemu_co_queue_restart_all(&req->wait_queue); |
| 1143 |
} |
| 1144 |
|
| 1145 |
/**
|
| 1146 |
* Add an active request to the tracked requests list
|
| 1147 |
*/
|
| 1148 |
static void tracked_request_begin(BdrvTrackedRequest *req, |
| 1149 |
BlockDriverState *bs, |
| 1150 |
int64_t sector_num, |
| 1151 |
int nb_sectors, bool is_write) |
| 1152 |
{
|
| 1153 |
*req = (BdrvTrackedRequest){
|
| 1154 |
.bs = bs, |
| 1155 |
.sector_num = sector_num, |
| 1156 |
.nb_sectors = nb_sectors, |
| 1157 |
.is_write = is_write, |
| 1158 |
.co = qemu_coroutine_self(), |
| 1159 |
}; |
| 1160 |
|
| 1161 |
qemu_co_queue_init(&req->wait_queue); |
| 1162 |
|
| 1163 |
QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
| 1164 |
} |
| 1165 |
|
| 1166 |
/**
|
| 1167 |
* Round a region to cluster boundaries
|
| 1168 |
*/
|
| 1169 |
static void round_to_clusters(BlockDriverState *bs, |
| 1170 |
int64_t sector_num, int nb_sectors,
|
| 1171 |
int64_t *cluster_sector_num, |
| 1172 |
int *cluster_nb_sectors)
|
| 1173 |
{
|
| 1174 |
BlockDriverInfo bdi; |
| 1175 |
|
| 1176 |
if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { |
| 1177 |
*cluster_sector_num = sector_num; |
| 1178 |
*cluster_nb_sectors = nb_sectors; |
| 1179 |
} else {
|
| 1180 |
int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; |
| 1181 |
*cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); |
| 1182 |
*cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + |
| 1183 |
nb_sectors, c); |
| 1184 |
} |
| 1185 |
} |
| 1186 |
|
| 1187 |
static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
| 1188 |
int64_t sector_num, int nb_sectors) {
|
| 1189 |
/* aaaa bbbb */
|
| 1190 |
if (sector_num >= req->sector_num + req->nb_sectors) {
|
| 1191 |
return false; |
| 1192 |
} |
| 1193 |
/* bbbb aaaa */
|
| 1194 |
if (req->sector_num >= sector_num + nb_sectors) {
|
| 1195 |
return false; |
| 1196 |
} |
| 1197 |
return true; |
| 1198 |
} |
| 1199 |
|
| 1200 |
static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, |
| 1201 |
int64_t sector_num, int nb_sectors)
|
| 1202 |
{
|
| 1203 |
BdrvTrackedRequest *req; |
| 1204 |
int64_t cluster_sector_num; |
| 1205 |
int cluster_nb_sectors;
|
| 1206 |
bool retry;
|
| 1207 |
|
| 1208 |
/* If we touch the same cluster it counts as an overlap. This guarantees
|
| 1209 |
* that allocating writes will be serialized and not race with each other
|
| 1210 |
* for the same cluster. For example, in copy-on-read it ensures that the
|
| 1211 |
* CoR read and write operations are atomic and guest writes cannot
|
| 1212 |
* interleave between them.
|
| 1213 |
*/
|
| 1214 |
round_to_clusters(bs, sector_num, nb_sectors, |
| 1215 |
&cluster_sector_num, &cluster_nb_sectors); |
| 1216 |
|
| 1217 |
do {
|
| 1218 |
retry = false;
|
| 1219 |
QLIST_FOREACH(req, &bs->tracked_requests, list) {
|
| 1220 |
if (tracked_request_overlaps(req, cluster_sector_num,
|
| 1221 |
cluster_nb_sectors)) {
|
| 1222 |
/* Hitting this means there was a reentrant request, for
|
| 1223 |
* example, a block driver issuing nested requests. This must
|
| 1224 |
* never happen since it means deadlock.
|
| 1225 |
*/
|
| 1226 |
assert(qemu_coroutine_self() != req->co); |
| 1227 |
|
| 1228 |
qemu_co_queue_wait(&req->wait_queue); |
| 1229 |
retry = true;
|
| 1230 |
break;
|
| 1231 |
} |
| 1232 |
} |
| 1233 |
} while (retry);
|
| 1234 |
} |
| 1235 |
|
| 1236 |
/*
|
| 1237 |
* Return values:
|
| 1238 |
* 0 - success
|
| 1239 |
* -EINVAL - backing format specified, but no file
|
| 1240 |
* -ENOSPC - can't update the backing file because no space is left in the
|
| 1241 |
* image file header
|
| 1242 |
* -ENOTSUP - format driver doesn't support changing the backing file
|
| 1243 |
*/
|
| 1244 |
int bdrv_change_backing_file(BlockDriverState *bs,
|
| 1245 |
const char *backing_file, const char *backing_fmt) |
| 1246 |
{
|
| 1247 |
BlockDriver *drv = bs->drv; |
| 1248 |
|
| 1249 |
if (drv->bdrv_change_backing_file != NULL) { |
| 1250 |
return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
|
| 1251 |
} else {
|
| 1252 |
return -ENOTSUP;
|
| 1253 |
} |
| 1254 |
} |
| 1255 |
|
| 1256 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
| 1257 |
size_t size) |
| 1258 |
{
|
| 1259 |
int64_t len; |
| 1260 |
|
| 1261 |
if (!bdrv_is_inserted(bs))
|
| 1262 |
return -ENOMEDIUM;
|
| 1263 |
|
| 1264 |
if (bs->growable)
|
| 1265 |
return 0; |
| 1266 |
|
| 1267 |
len = bdrv_getlength(bs); |
| 1268 |
|
| 1269 |
if (offset < 0) |
| 1270 |
return -EIO;
|
| 1271 |
|
| 1272 |
if ((offset > len) || (len - offset < size))
|
| 1273 |
return -EIO;
|
| 1274 |
|
| 1275 |
return 0; |
| 1276 |
} |
| 1277 |
|
| 1278 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
| 1279 |
int nb_sectors)
|
| 1280 |
{
|
| 1281 |
return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
|
| 1282 |
nb_sectors * BDRV_SECTOR_SIZE); |
| 1283 |
} |
| 1284 |
|
| 1285 |
typedef struct RwCo { |
| 1286 |
BlockDriverState *bs; |
| 1287 |
int64_t sector_num; |
| 1288 |
int nb_sectors;
|
| 1289 |
QEMUIOVector *qiov; |
| 1290 |
bool is_write;
|
| 1291 |
int ret;
|
| 1292 |
} RwCo; |
| 1293 |
|
| 1294 |
static void coroutine_fn bdrv_rw_co_entry(void *opaque) |
| 1295 |
{
|
| 1296 |
RwCo *rwco = opaque; |
| 1297 |
|
| 1298 |
if (!rwco->is_write) {
|
| 1299 |
rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, |
| 1300 |
rwco->nb_sectors, rwco->qiov, 0);
|
| 1301 |
} else {
|
| 1302 |
rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, |
| 1303 |
rwco->nb_sectors, rwco->qiov); |
| 1304 |
} |
| 1305 |
} |
| 1306 |
|
| 1307 |
/*
|
| 1308 |
* Process a synchronous request using coroutines
|
| 1309 |
*/
|
| 1310 |
static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, |
| 1311 |
int nb_sectors, bool is_write) |
| 1312 |
{
|
| 1313 |
QEMUIOVector qiov; |
| 1314 |
struct iovec iov = {
|
| 1315 |
.iov_base = (void *)buf,
|
| 1316 |
.iov_len = nb_sectors * BDRV_SECTOR_SIZE, |
| 1317 |
}; |
| 1318 |
Coroutine *co; |
| 1319 |
RwCo rwco = {
|
| 1320 |
.bs = bs, |
| 1321 |
.sector_num = sector_num, |
| 1322 |
.nb_sectors = nb_sectors, |
| 1323 |
.qiov = &qiov, |
| 1324 |
.is_write = is_write, |
| 1325 |
.ret = NOT_DONE, |
| 1326 |
}; |
| 1327 |
|
| 1328 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
| 1329 |
|
| 1330 |
if (qemu_in_coroutine()) {
|
| 1331 |
/* Fast-path if already in coroutine context */
|
| 1332 |
bdrv_rw_co_entry(&rwco); |
| 1333 |
} else {
|
| 1334 |
co = qemu_coroutine_create(bdrv_rw_co_entry); |
| 1335 |
qemu_coroutine_enter(co, &rwco); |
| 1336 |
while (rwco.ret == NOT_DONE) {
|
| 1337 |
qemu_aio_wait(); |
| 1338 |
} |
| 1339 |
} |
| 1340 |
return rwco.ret;
|
| 1341 |
} |
| 1342 |
|
| 1343 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
| 1344 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
| 1345 |
uint8_t *buf, int nb_sectors)
|
| 1346 |
{
|
| 1347 |
return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); |
| 1348 |
} |
| 1349 |
|
| 1350 |
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
| 1351 |
int nb_sectors, int dirty) |
| 1352 |
{
|
| 1353 |
int64_t start, end; |
| 1354 |
unsigned long val, idx, bit; |
| 1355 |
|
| 1356 |
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
| 1357 |
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
| 1358 |
|
| 1359 |
for (; start <= end; start++) {
|
| 1360 |
idx = start / (sizeof(unsigned long) * 8); |
| 1361 |
bit = start % (sizeof(unsigned long) * 8); |
| 1362 |
val = bs->dirty_bitmap[idx]; |
| 1363 |
if (dirty) {
|
| 1364 |
if (!(val & (1UL << bit))) { |
| 1365 |
bs->dirty_count++; |
| 1366 |
val |= 1UL << bit;
|
| 1367 |
} |
| 1368 |
} else {
|
| 1369 |
if (val & (1UL << bit)) { |
| 1370 |
bs->dirty_count--; |
| 1371 |
val &= ~(1UL << bit);
|
| 1372 |
} |
| 1373 |
} |
| 1374 |
bs->dirty_bitmap[idx] = val; |
| 1375 |
} |
| 1376 |
} |
| 1377 |
|
| 1378 |
/* Return < 0 if error. Important errors are:
|
| 1379 |
-EIO generic I/O error (may happen for all errors)
|
| 1380 |
-ENOMEDIUM No media inserted.
|
| 1381 |
-EINVAL Invalid sector number or nb_sectors
|
| 1382 |
-EACCES Trying to write a read-only device
|
| 1383 |
*/
|
| 1384 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
| 1385 |
const uint8_t *buf, int nb_sectors) |
| 1386 |
{
|
| 1387 |
return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); |
| 1388 |
} |
| 1389 |
|
| 1390 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
| 1391 |
void *buf, int count1) |
| 1392 |
{
|
| 1393 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
| 1394 |
int len, nb_sectors, count;
|
| 1395 |
int64_t sector_num; |
| 1396 |
int ret;
|
| 1397 |
|
| 1398 |
count = count1; |
| 1399 |
/* first read to align to sector start */
|
| 1400 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
| 1401 |
if (len > count)
|
| 1402 |
len = count; |
| 1403 |
sector_num = offset >> BDRV_SECTOR_BITS; |
| 1404 |
if (len > 0) { |
| 1405 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 1406 |
return ret;
|
| 1407 |
memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
|
| 1408 |
count -= len; |
| 1409 |
if (count == 0) |
| 1410 |
return count1;
|
| 1411 |
sector_num++; |
| 1412 |
buf += len; |
| 1413 |
} |
| 1414 |
|
| 1415 |
/* read the sectors "in place" */
|
| 1416 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
| 1417 |
if (nb_sectors > 0) { |
| 1418 |
if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
| 1419 |
return ret;
|
| 1420 |
sector_num += nb_sectors; |
| 1421 |
len = nb_sectors << BDRV_SECTOR_BITS; |
| 1422 |
buf += len; |
| 1423 |
count -= len; |
| 1424 |
} |
| 1425 |
|
| 1426 |
/* add data from the last sector */
|
| 1427 |
if (count > 0) { |
| 1428 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 1429 |
return ret;
|
| 1430 |
memcpy(buf, tmp_buf, count); |
| 1431 |
} |
| 1432 |
return count1;
|
| 1433 |
} |
| 1434 |
|
| 1435 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
| 1436 |
const void *buf, int count1) |
| 1437 |
{
|
| 1438 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
| 1439 |
int len, nb_sectors, count;
|
| 1440 |
int64_t sector_num; |
| 1441 |
int ret;
|
| 1442 |
|
| 1443 |
count = count1; |
| 1444 |
/* first write to align to sector start */
|
| 1445 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
| 1446 |
if (len > count)
|
| 1447 |
len = count; |
| 1448 |
sector_num = offset >> BDRV_SECTOR_BITS; |
| 1449 |
if (len > 0) { |
| 1450 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 1451 |
return ret;
|
| 1452 |
memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
|
| 1453 |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
| 1454 |
return ret;
|
| 1455 |
count -= len; |
| 1456 |
if (count == 0) |
| 1457 |
return count1;
|
| 1458 |
sector_num++; |
| 1459 |
buf += len; |
| 1460 |
} |
| 1461 |
|
| 1462 |
/* write the sectors "in place" */
|
| 1463 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
| 1464 |
if (nb_sectors > 0) { |
| 1465 |
if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
| 1466 |
return ret;
|
| 1467 |
sector_num += nb_sectors; |
| 1468 |
len = nb_sectors << BDRV_SECTOR_BITS; |
| 1469 |
buf += len; |
| 1470 |
count -= len; |
| 1471 |
} |
| 1472 |
|
| 1473 |
/* add data from the last sector */
|
| 1474 |
if (count > 0) { |
| 1475 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
| 1476 |
return ret;
|
| 1477 |
memcpy(tmp_buf, buf, count); |
| 1478 |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
| 1479 |
return ret;
|
| 1480 |
} |
| 1481 |
return count1;
|
| 1482 |
} |
| 1483 |
|
| 1484 |
/*
|
| 1485 |
* Writes to the file and ensures that no writes are reordered across this
|
| 1486 |
* request (acts as a barrier)
|
| 1487 |
*
|
| 1488 |
* Returns 0 on success, -errno in error cases.
|
| 1489 |
*/
|
| 1490 |
int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
|
| 1491 |
const void *buf, int count) |
| 1492 |
{
|
| 1493 |
int ret;
|
| 1494 |
|
| 1495 |
ret = bdrv_pwrite(bs, offset, buf, count); |
| 1496 |
if (ret < 0) { |
| 1497 |
return ret;
|
| 1498 |
} |
| 1499 |
|
| 1500 |
/* No flush needed for cache modes that use O_DSYNC */
|
| 1501 |
if ((bs->open_flags & BDRV_O_CACHE_WB) != 0) { |
| 1502 |
bdrv_flush(bs); |
| 1503 |
} |
| 1504 |
|
| 1505 |
return 0; |
| 1506 |
} |
| 1507 |
|
| 1508 |
static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
| 1509 |
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
|
| 1510 |
{
|
| 1511 |
/* Perform I/O through a temporary buffer so that users who scribble over
|
| 1512 |
* their read buffer while the operation is in progress do not end up
|
| 1513 |
* modifying the image file. This is critical for zero-copy guest I/O
|
| 1514 |
* where anything might happen inside guest memory.
|
| 1515 |
*/
|
| 1516 |
void *bounce_buffer;
|
| 1517 |
|
| 1518 |
struct iovec iov;
|
| 1519 |
QEMUIOVector bounce_qiov; |
| 1520 |
int64_t cluster_sector_num; |
| 1521 |
int cluster_nb_sectors;
|
| 1522 |
size_t skip_bytes; |
| 1523 |
int ret;
|
| 1524 |
|
| 1525 |
/* Cover entire cluster so no additional backing file I/O is required when
|
| 1526 |
* allocating cluster in the image file.
|
| 1527 |
*/
|
| 1528 |
round_to_clusters(bs, sector_num, nb_sectors, |
| 1529 |
&cluster_sector_num, &cluster_nb_sectors); |
| 1530 |
|
| 1531 |
trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
| 1532 |
cluster_sector_num, cluster_nb_sectors); |
| 1533 |
|
| 1534 |
iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; |
| 1535 |
iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); |
| 1536 |
qemu_iovec_init_external(&bounce_qiov, &iov, 1);
|
| 1537 |
|
| 1538 |
ret = bs->drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
| 1539 |
&bounce_qiov); |
| 1540 |
if (ret < 0) { |
| 1541 |
goto err;
|
| 1542 |
} |
| 1543 |
|
| 1544 |
ret = bs->drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
| 1545 |
&bounce_qiov); |
| 1546 |
if (ret < 0) { |
| 1547 |
/* It might be okay to ignore write errors for guest requests. If this
|
| 1548 |
* is a deliberate copy-on-read then we don't want to ignore the error.
|
| 1549 |
* Simply report it in all cases.
|
| 1550 |
*/
|
| 1551 |
goto err;
|
| 1552 |
} |
| 1553 |
|
| 1554 |
skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; |
| 1555 |
qemu_iovec_from_buffer(qiov, bounce_buffer + skip_bytes, |
| 1556 |
nb_sectors * BDRV_SECTOR_SIZE); |
| 1557 |
|
| 1558 |
err:
|
| 1559 |
qemu_vfree(bounce_buffer); |
| 1560 |
return ret;
|
| 1561 |
} |
| 1562 |
|
| 1563 |
/*
|
| 1564 |
* Handle a read request in coroutine context
|
| 1565 |
*/
|
| 1566 |
static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
| 1567 |
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
|
| 1568 |
BdrvRequestFlags flags) |
| 1569 |
{
|
| 1570 |
BlockDriver *drv = bs->drv; |
| 1571 |
BdrvTrackedRequest req; |
| 1572 |
int ret;
|
| 1573 |
|
| 1574 |
if (!drv) {
|
| 1575 |
return -ENOMEDIUM;
|
| 1576 |
} |
| 1577 |
if (bdrv_check_request(bs, sector_num, nb_sectors)) {
|
| 1578 |
return -EIO;
|
| 1579 |
} |
| 1580 |
|
| 1581 |
/* throttling disk read I/O */
|
| 1582 |
if (bs->io_limits_enabled) {
|
| 1583 |
bdrv_io_limits_intercept(bs, false, nb_sectors);
|
| 1584 |
} |
| 1585 |
|
| 1586 |
if (bs->copy_on_read) {
|
| 1587 |
flags |= BDRV_REQ_COPY_ON_READ; |
| 1588 |
} |
| 1589 |
if (flags & BDRV_REQ_COPY_ON_READ) {
|
| 1590 |
bs->copy_on_read_in_flight++; |
| 1591 |
} |
| 1592 |
|
| 1593 |
if (bs->copy_on_read_in_flight) {
|
| 1594 |
wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
| 1595 |
} |
| 1596 |
|
| 1597 |
tracked_request_begin(&req, bs, sector_num, nb_sectors, false);
|
| 1598 |
|
| 1599 |
if (flags & BDRV_REQ_COPY_ON_READ) {
|
| 1600 |
int pnum;
|
| 1601 |
|
| 1602 |
ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum); |
| 1603 |
if (ret < 0) { |
| 1604 |
goto out;
|
| 1605 |
} |
| 1606 |
|
| 1607 |
if (!ret || pnum != nb_sectors) {
|
| 1608 |
ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
| 1609 |
goto out;
|
| 1610 |
} |
| 1611 |
} |
| 1612 |
|
| 1613 |
ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
| 1614 |
|
| 1615 |
out:
|
| 1616 |
tracked_request_end(&req); |
| 1617 |
|
| 1618 |
if (flags & BDRV_REQ_COPY_ON_READ) {
|
| 1619 |
bs->copy_on_read_in_flight--; |
| 1620 |
} |
| 1621 |
|
| 1622 |
return ret;
|
| 1623 |
} |
| 1624 |
|
| 1625 |
int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
|
| 1626 |
int nb_sectors, QEMUIOVector *qiov)
|
| 1627 |
{
|
| 1628 |
trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
| 1629 |
|
| 1630 |
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
| 1631 |
} |
| 1632 |
|
| 1633 |
int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
|
| 1634 |
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
|
| 1635 |
{
|
| 1636 |
trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); |
| 1637 |
|
| 1638 |
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov,
|
| 1639 |
BDRV_REQ_COPY_ON_READ); |
| 1640 |
} |
| 1641 |
|
| 1642 |
/*
|
| 1643 |
* Handle a write request in coroutine context
|
| 1644 |
*/
|
| 1645 |
static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
| 1646 |
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
|
| 1647 |
{
|
| 1648 |
BlockDriver *drv = bs->drv; |
| 1649 |
BdrvTrackedRequest req; |
| 1650 |
int ret;
|
| 1651 |
|
| 1652 |
if (!bs->drv) {
|
| 1653 |
return -ENOMEDIUM;
|
| 1654 |
} |
| 1655 |
if (bs->read_only) {
|
| 1656 |
return -EACCES;
|
| 1657 |
} |
| 1658 |
if (bdrv_check_request(bs, sector_num, nb_sectors)) {
|
| 1659 |
return -EIO;
|
| 1660 |
} |
| 1661 |
|
| 1662 |
/* throttling disk write I/O */
|
| 1663 |
if (bs->io_limits_enabled) {
|
| 1664 |
bdrv_io_limits_intercept(bs, true, nb_sectors);
|
| 1665 |
} |
| 1666 |
|
| 1667 |
if (bs->copy_on_read_in_flight) {
|
| 1668 |
wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
| 1669 |
} |
| 1670 |
|
| 1671 |
tracked_request_begin(&req, bs, sector_num, nb_sectors, true);
|
| 1672 |
|
| 1673 |
ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); |
| 1674 |
|
| 1675 |
if (bs->dirty_bitmap) {
|
| 1676 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
| 1677 |
} |
| 1678 |
|
| 1679 |
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
| 1680 |
bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
| 1681 |
} |
| 1682 |
|
| 1683 |
tracked_request_end(&req); |
| 1684 |
|
| 1685 |
return ret;
|
| 1686 |
} |
| 1687 |
|
| 1688 |
int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
|
| 1689 |
int nb_sectors, QEMUIOVector *qiov)
|
| 1690 |
{
|
| 1691 |
trace_bdrv_co_writev(bs, sector_num, nb_sectors); |
| 1692 |
|
| 1693 |
return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov);
|
| 1694 |
} |
| 1695 |
|
| 1696 |
/**
|
| 1697 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
| 1698 |
*/
|
| 1699 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
| 1700 |
{
|
| 1701 |
BlockDriver *drv = bs->drv; |
| 1702 |
int ret;
|
| 1703 |
if (!drv)
|
| 1704 |
return -ENOMEDIUM;
|
| 1705 |
if (!drv->bdrv_truncate)
|
| 1706 |
return -ENOTSUP;
|
| 1707 |
if (bs->read_only)
|
| 1708 |
return -EACCES;
|
| 1709 |
if (bdrv_in_use(bs))
|
| 1710 |
return -EBUSY;
|
| 1711 |
ret = drv->bdrv_truncate(bs, offset); |
| 1712 |
if (ret == 0) { |
| 1713 |
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
| 1714 |
bdrv_dev_resize_cb(bs); |
| 1715 |
} |
| 1716 |
return ret;
|
| 1717 |
} |
| 1718 |
|
| 1719 |
/**
|
| 1720 |
* Length of a allocated file in bytes. Sparse files are counted by actual
|
| 1721 |
* allocated space. Return < 0 if error or unknown.
|
| 1722 |
*/
|
| 1723 |
int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) |
| 1724 |
{
|
| 1725 |
BlockDriver *drv = bs->drv; |
| 1726 |
if (!drv) {
|
| 1727 |
return -ENOMEDIUM;
|
| 1728 |
} |
| 1729 |
if (drv->bdrv_get_allocated_file_size) {
|
| 1730 |
return drv->bdrv_get_allocated_file_size(bs);
|
| 1731 |
} |
| 1732 |
if (bs->file) {
|
| 1733 |
return bdrv_get_allocated_file_size(bs->file);
|
| 1734 |
} |
| 1735 |
return -ENOTSUP;
|
| 1736 |
} |
| 1737 |
|
| 1738 |
/**
|
| 1739 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
| 1740 |
*/
|
| 1741 |
int64_t bdrv_getlength(BlockDriverState *bs) |
| 1742 |
{
|
| 1743 |
BlockDriver *drv = bs->drv; |
| 1744 |
if (!drv)
|
| 1745 |
return -ENOMEDIUM;
|
| 1746 |
|
| 1747 |
if (bs->growable || bdrv_dev_has_removable_media(bs)) {
|
| 1748 |
if (drv->bdrv_getlength) {
|
| 1749 |
return drv->bdrv_getlength(bs);
|
| 1750 |
} |
| 1751 |
} |
| 1752 |
return bs->total_sectors * BDRV_SECTOR_SIZE;
|
| 1753 |
} |
| 1754 |
|
| 1755 |
/* return 0 as number of sectors if no device present or error */
|
| 1756 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
| 1757 |
{
|
| 1758 |
int64_t length; |
| 1759 |
length = bdrv_getlength(bs); |
| 1760 |
if (length < 0) |
| 1761 |
length = 0;
|
| 1762 |
else
|
| 1763 |
length = length >> BDRV_SECTOR_BITS; |
| 1764 |
*nb_sectors_ptr = length; |
| 1765 |
} |
| 1766 |
|
| 1767 |
struct partition {
|
| 1768 |
uint8_t boot_ind; /* 0x80 - active */
|
| 1769 |
uint8_t head; /* starting head */
|
| 1770 |
uint8_t sector; /* starting sector */
|
| 1771 |
uint8_t cyl; /* starting cylinder */
|
| 1772 |
uint8_t sys_ind; /* What partition type */
|
| 1773 |
uint8_t end_head; /* end head */
|
| 1774 |
uint8_t end_sector; /* end sector */
|
| 1775 |
uint8_t end_cyl; /* end cylinder */
|
| 1776 |
uint32_t start_sect; /* starting sector counting from 0 */
|
| 1777 |
uint32_t nr_sects; /* nr of sectors in partition */
|
| 1778 |
} QEMU_PACKED; |
| 1779 |
|
| 1780 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
| 1781 |
static int guess_disk_lchs(BlockDriverState *bs, |
| 1782 |
int *pcylinders, int *pheads, int *psectors) |
| 1783 |
{
|
| 1784 |
uint8_t buf[BDRV_SECTOR_SIZE]; |
| 1785 |
int ret, i, heads, sectors, cylinders;
|
| 1786 |
struct partition *p;
|
| 1787 |
uint32_t nr_sects; |
| 1788 |
uint64_t nb_sectors; |
| 1789 |
|
| 1790 |
bdrv_get_geometry(bs, &nb_sectors); |
| 1791 |
|
| 1792 |
ret = bdrv_read(bs, 0, buf, 1); |
| 1793 |
if (ret < 0) |
| 1794 |
return -1; |
| 1795 |
/* test msdos magic */
|
| 1796 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
| 1797 |
return -1; |
| 1798 |
for(i = 0; i < 4; i++) { |
| 1799 |
p = ((struct partition *)(buf + 0x1be)) + i; |
| 1800 |
nr_sects = le32_to_cpu(p->nr_sects); |
| 1801 |
if (nr_sects && p->end_head) {
|
| 1802 |
/* We make the assumption that the partition terminates on
|
| 1803 |
a cylinder boundary */
|
| 1804 |
heads = p->end_head + 1;
|
| 1805 |
sectors = p->end_sector & 63;
|
| 1806 |
if (sectors == 0) |
| 1807 |
continue;
|
| 1808 |
cylinders = nb_sectors / (heads * sectors); |
| 1809 |
if (cylinders < 1 || cylinders > 16383) |
| 1810 |
continue;
|
| 1811 |
*pheads = heads; |
| 1812 |
*psectors = sectors; |
| 1813 |
*pcylinders = cylinders; |
| 1814 |
#if 0
|
| 1815 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
| 1816 |
cylinders, heads, sectors);
|
| 1817 |
#endif
|
| 1818 |
return 0; |
| 1819 |
} |
| 1820 |
} |
| 1821 |
return -1; |
| 1822 |
} |
| 1823 |
|
| 1824 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
| 1825 |
{
|
| 1826 |
int translation, lba_detected = 0; |
| 1827 |
int cylinders, heads, secs;
|
| 1828 |
uint64_t nb_sectors; |
| 1829 |
|
| 1830 |
/* if a geometry hint is available, use it */
|
| 1831 |
bdrv_get_geometry(bs, &nb_sectors); |
| 1832 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
| 1833 |
translation = bdrv_get_translation_hint(bs); |
| 1834 |
if (cylinders != 0) { |
| 1835 |
*pcyls = cylinders; |
| 1836 |
*pheads = heads; |
| 1837 |
*psecs = secs; |
| 1838 |
} else {
|
| 1839 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
| 1840 |
if (heads > 16) { |
| 1841 |
/* if heads > 16, it means that a BIOS LBA
|
| 1842 |
translation was active, so the default
|
| 1843 |
hardware geometry is OK */
|
| 1844 |
lba_detected = 1;
|
| 1845 |
goto default_geometry;
|
| 1846 |
} else {
|
| 1847 |
*pcyls = cylinders; |
| 1848 |
*pheads = heads; |
| 1849 |
*psecs = secs; |
| 1850 |
/* disable any translation to be in sync with
|
| 1851 |
the logical geometry */
|
| 1852 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
| 1853 |
bdrv_set_translation_hint(bs, |
| 1854 |
BIOS_ATA_TRANSLATION_NONE); |
| 1855 |
} |
| 1856 |
} |
| 1857 |
} else {
|
| 1858 |
default_geometry:
|
| 1859 |
/* if no geometry, use a standard physical disk geometry */
|
| 1860 |
cylinders = nb_sectors / (16 * 63); |
| 1861 |
|
| 1862 |
if (cylinders > 16383) |
| 1863 |
cylinders = 16383;
|
| 1864 |
else if (cylinders < 2) |
| 1865 |
cylinders = 2;
|
| 1866 |
*pcyls = cylinders; |
| 1867 |
*pheads = 16;
|
| 1868 |
*psecs = 63;
|
| 1869 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
| 1870 |
if ((*pcyls * *pheads) <= 131072) { |
| 1871 |
bdrv_set_translation_hint(bs, |
| 1872 |
BIOS_ATA_TRANSLATION_LARGE); |
| 1873 |
} else {
|
| 1874 |
bdrv_set_translation_hint(bs, |
| 1875 |
BIOS_ATA_TRANSLATION_LBA); |
| 1876 |
} |
| 1877 |
} |
| 1878 |
} |
| 1879 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
| 1880 |
} |
| 1881 |
} |
| 1882 |
|
| 1883 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
| 1884 |
int cyls, int heads, int secs) |
| 1885 |
{
|
| 1886 |
bs->cyls = cyls; |
| 1887 |
bs->heads = heads; |
| 1888 |
bs->secs = secs; |
| 1889 |
} |
| 1890 |
|
| 1891 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
| 1892 |
{
|
| 1893 |
bs->translation = translation; |
| 1894 |
} |
| 1895 |
|
| 1896 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
| 1897 |
int *pcyls, int *pheads, int *psecs) |
| 1898 |
{
|
| 1899 |
*pcyls = bs->cyls; |
| 1900 |
*pheads = bs->heads; |
| 1901 |
*psecs = bs->secs; |
| 1902 |
} |
| 1903 |
|
| 1904 |
/* throttling disk io limits */
|
| 1905 |
void bdrv_set_io_limits(BlockDriverState *bs,
|
| 1906 |
BlockIOLimit *io_limits) |
| 1907 |
{
|
| 1908 |
bs->io_limits = *io_limits; |
| 1909 |
bs->io_limits_enabled = bdrv_io_limits_enabled(bs); |
| 1910 |
} |
| 1911 |
|
| 1912 |
/* Recognize floppy formats */
|
| 1913 |
typedef struct FDFormat { |
| 1914 |
FDriveType drive; |
| 1915 |
uint8_t last_sect; |
| 1916 |
uint8_t max_track; |
| 1917 |
uint8_t max_head; |
| 1918 |
} FDFormat; |
| 1919 |
|
| 1920 |
static const FDFormat fd_formats[] = { |
| 1921 |
/* First entry is default format */
|
| 1922 |
/* 1.44 MB 3"1/2 floppy disks */
|
| 1923 |
{ FDRIVE_DRV_144, 18, 80, 1, },
|
| 1924 |
{ FDRIVE_DRV_144, 20, 80, 1, },
|
| 1925 |
{ FDRIVE_DRV_144, 21, 80, 1, },
|
| 1926 |
{ FDRIVE_DRV_144, 21, 82, 1, },
|
| 1927 |
{ FDRIVE_DRV_144, 21, 83, 1, },
|
| 1928 |
{ FDRIVE_DRV_144, 22, 80, 1, },
|
| 1929 |
{ FDRIVE_DRV_144, 23, 80, 1, },
|
| 1930 |
{ FDRIVE_DRV_144, 24, 80, 1, },
|
| 1931 |
/* 2.88 MB 3"1/2 floppy disks */
|
| 1932 |
{ FDRIVE_DRV_288, 36, 80, 1, },
|
| 1933 |
{ FDRIVE_DRV_288, 39, 80, 1, },
|
| 1934 |
{ FDRIVE_DRV_288, 40, 80, 1, },
|
| 1935 |
{ FDRIVE_DRV_288, 44, 80, 1, },
|
| 1936 |
{ FDRIVE_DRV_288, 48, 80, 1, },
|
| 1937 |
/* 720 kB 3"1/2 floppy disks */
|
| 1938 |
{ FDRIVE_DRV_144, 9, 80, 1, },
|
| 1939 |
{ FDRIVE_DRV_144, 10, 80, 1, },
|
| 1940 |
{ FDRIVE_DRV_144, 10, 82, 1, },
|
| 1941 |
{ FDRIVE_DRV_144, 10, 83, 1, },
|
| 1942 |
{ FDRIVE_DRV_144, 13, 80, 1, },
|
| 1943 |
{ FDRIVE_DRV_144, 14, 80, 1, },
|
| 1944 |
/* 1.2 MB 5"1/4 floppy disks */
|
| 1945 |
{ FDRIVE_DRV_120, 15, 80, 1, },
|
| 1946 |
{ FDRIVE_DRV_120, 18, 80, 1, },
|
| 1947 |
{ FDRIVE_DRV_120, 18, 82, 1, },
|
| 1948 |
{ FDRIVE_DRV_120, 18, 83, 1, },
|
| 1949 |
{ FDRIVE_DRV_120, 20, 80, 1, },
|
| 1950 |
/* 720 kB 5"1/4 floppy disks */
|
| 1951 |
{ FDRIVE_DRV_120, 9, 80, 1, },
|
| 1952 |
{ FDRIVE_DRV_120, 11, 80, 1, },
|
| 1953 |
/* 360 kB 5"1/4 floppy disks */
|
| 1954 |
{ FDRIVE_DRV_120, 9, 40, 1, },
|
| 1955 |
{ FDRIVE_DRV_120, 9, 40, 0, },
|
| 1956 |
{ FDRIVE_DRV_120, 10, 41, 1, },
|
| 1957 |
{ FDRIVE_DRV_120, 10, 42, 1, },
|
| 1958 |
/* 320 kB 5"1/4 floppy disks */
|
| 1959 |
{ FDRIVE_DRV_120, 8, 40, 1, },
|
| 1960 |
{ FDRIVE_DRV_120, 8, 40, 0, },
|
| 1961 |
/* 360 kB must match 5"1/4 better than 3"1/2... */
|
| 1962 |
{ FDRIVE_DRV_144, 9, 80, 0, },
|
| 1963 |
/* end */
|
| 1964 |
{ FDRIVE_DRV_NONE, -1, -1, 0, },
|
| 1965 |
}; |
| 1966 |
|
| 1967 |
void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, |
| 1968 |
int *max_track, int *last_sect, |
| 1969 |
FDriveType drive_in, FDriveType *drive) |
| 1970 |
{
|
| 1971 |
const FDFormat *parse;
|
| 1972 |
uint64_t nb_sectors, size; |
| 1973 |
int i, first_match, match;
|
| 1974 |
|
| 1975 |
bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); |
| 1976 |
if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { |
| 1977 |
/* User defined disk */
|
| 1978 |
} else {
|
| 1979 |
bdrv_get_geometry(bs, &nb_sectors); |
| 1980 |
match = -1;
|
| 1981 |
first_match = -1;
|
| 1982 |
for (i = 0; ; i++) { |
| 1983 |
parse = &fd_formats[i]; |
| 1984 |
if (parse->drive == FDRIVE_DRV_NONE) {
|
| 1985 |
break;
|
| 1986 |
} |
| 1987 |
if (drive_in == parse->drive ||
|
| 1988 |
drive_in == FDRIVE_DRV_NONE) {
|
| 1989 |
size = (parse->max_head + 1) * parse->max_track *
|
| 1990 |
parse->last_sect; |
| 1991 |
if (nb_sectors == size) {
|
| 1992 |
match = i; |
| 1993 |
break;
|
| 1994 |
} |
| 1995 |
if (first_match == -1) { |
| 1996 |
first_match = i; |
| 1997 |
} |
| 1998 |
} |
| 1999 |
} |
| 2000 |
if (match == -1) { |
| 2001 |
if (first_match == -1) { |
| 2002 |
match = 1;
|
| 2003 |
} else {
|
| 2004 |
match = first_match; |
| 2005 |
} |
| 2006 |
parse = &fd_formats[match]; |
| 2007 |
} |
| 2008 |
*nb_heads = parse->max_head + 1;
|
| 2009 |
*max_track = parse->max_track; |
| 2010 |
*last_sect = parse->last_sect; |
| 2011 |
*drive = parse->drive; |
| 2012 |
} |
| 2013 |
} |
| 2014 |
|
| 2015 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
| 2016 |
{
|
| 2017 |
return bs->translation;
|
| 2018 |
} |
| 2019 |
|
| 2020 |
void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
|
| 2021 |
BlockErrorAction on_write_error) |
| 2022 |
{
|
| 2023 |
bs->on_read_error = on_read_error; |
| 2024 |
bs->on_write_error = on_write_error; |
| 2025 |
} |
| 2026 |
|
| 2027 |
BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
|
| 2028 |
{
|
| 2029 |
return is_read ? bs->on_read_error : bs->on_write_error;
|
| 2030 |
} |
| 2031 |
|
| 2032 |
int bdrv_is_read_only(BlockDriverState *bs)
|
| 2033 |
{
|
| 2034 |
return bs->read_only;
|
| 2035 |
} |
| 2036 |
|
| 2037 |
int bdrv_is_sg(BlockDriverState *bs)
|
| 2038 |
{
|
| 2039 |
return bs->sg;
|
| 2040 |
} |
| 2041 |
|
| 2042 |
int bdrv_enable_write_cache(BlockDriverState *bs)
|
| 2043 |
{
|
| 2044 |
return bs->enable_write_cache;
|
| 2045 |
} |
| 2046 |
|
| 2047 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
| 2048 |
{
|
| 2049 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
| 2050 |
return 1; |
| 2051 |
return bs->encrypted;
|
| 2052 |
} |
| 2053 |
|
| 2054 |
int bdrv_key_required(BlockDriverState *bs)
|
| 2055 |
{
|
| 2056 |
BlockDriverState *backing_hd = bs->backing_hd; |
| 2057 |
|
| 2058 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
| 2059 |
return 1; |
| 2060 |
return (bs->encrypted && !bs->valid_key);
|
| 2061 |
} |
| 2062 |
|
| 2063 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 2064 |
{
|
| 2065 |
int ret;
|
| 2066 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
| 2067 |
ret = bdrv_set_key(bs->backing_hd, key); |
| 2068 |
if (ret < 0) |
| 2069 |
return ret;
|
| 2070 |
if (!bs->encrypted)
|
| 2071 |
return 0; |
| 2072 |
} |
| 2073 |
if (!bs->encrypted) {
|
| 2074 |
return -EINVAL;
|
| 2075 |
} else if (!bs->drv || !bs->drv->bdrv_set_key) { |
| 2076 |
return -ENOMEDIUM;
|
| 2077 |
} |
| 2078 |
ret = bs->drv->bdrv_set_key(bs, key); |
| 2079 |
if (ret < 0) { |
| 2080 |
bs->valid_key = 0;
|
| 2081 |
} else if (!bs->valid_key) { |
| 2082 |
bs->valid_key = 1;
|
| 2083 |
/* call the change callback now, we skipped it on open */
|
| 2084 |
bdrv_dev_change_media_cb(bs, true);
|
| 2085 |
} |
| 2086 |
return ret;
|
| 2087 |
} |
| 2088 |
|
| 2089 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
| 2090 |
{
|
| 2091 |
if (!bs->drv) {
|
| 2092 |
buf[0] = '\0'; |
| 2093 |
} else {
|
| 2094 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
| 2095 |
} |
| 2096 |
} |
| 2097 |
|
| 2098 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
| 2099 |
void *opaque)
|
| 2100 |
{
|
| 2101 |
BlockDriver *drv; |
| 2102 |
|
| 2103 |
QLIST_FOREACH(drv, &bdrv_drivers, list) {
|
| 2104 |
it(opaque, drv->format_name); |
| 2105 |
} |
| 2106 |
} |
| 2107 |
|
| 2108 |
BlockDriverState *bdrv_find(const char *name) |
| 2109 |
{
|
| 2110 |
BlockDriverState *bs; |
| 2111 |
|
| 2112 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 2113 |
if (!strcmp(name, bs->device_name)) {
|
| 2114 |
return bs;
|
| 2115 |
} |
| 2116 |
} |
| 2117 |
return NULL; |
| 2118 |
} |
| 2119 |
|
| 2120 |
BlockDriverState *bdrv_next(BlockDriverState *bs) |
| 2121 |
{
|
| 2122 |
if (!bs) {
|
| 2123 |
return QTAILQ_FIRST(&bdrv_states);
|
| 2124 |
} |
| 2125 |
return QTAILQ_NEXT(bs, list);
|
| 2126 |
} |
| 2127 |
|
| 2128 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
| 2129 |
{
|
| 2130 |
BlockDriverState *bs; |
| 2131 |
|
| 2132 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 2133 |
it(opaque, bs); |
| 2134 |
} |
| 2135 |
} |
| 2136 |
|
| 2137 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
| 2138 |
{
|
| 2139 |
return bs->device_name;
|
| 2140 |
} |
| 2141 |
|
| 2142 |
void bdrv_flush_all(void) |
| 2143 |
{
|
| 2144 |
BlockDriverState *bs; |
| 2145 |
|
| 2146 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 2147 |
if (!bdrv_is_read_only(bs) && bdrv_is_inserted(bs)) {
|
| 2148 |
bdrv_flush(bs); |
| 2149 |
} |
| 2150 |
} |
| 2151 |
} |
| 2152 |
|
| 2153 |
int bdrv_has_zero_init(BlockDriverState *bs)
|
| 2154 |
{
|
| 2155 |
assert(bs->drv); |
| 2156 |
|
| 2157 |
if (bs->drv->bdrv_has_zero_init) {
|
| 2158 |
return bs->drv->bdrv_has_zero_init(bs);
|
| 2159 |
} |
| 2160 |
|
| 2161 |
return 1; |
| 2162 |
} |
| 2163 |
|
| 2164 |
typedef struct BdrvCoIsAllocatedData { |
| 2165 |
BlockDriverState *bs; |
| 2166 |
int64_t sector_num; |
| 2167 |
int nb_sectors;
|
| 2168 |
int *pnum;
|
| 2169 |
int ret;
|
| 2170 |
bool done;
|
| 2171 |
} BdrvCoIsAllocatedData; |
| 2172 |
|
| 2173 |
/*
|
| 2174 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
| 2175 |
* not implementing the functionality are assumed to not support backing files,
|
| 2176 |
* hence all their sectors are reported as allocated.
|
| 2177 |
*
|
| 2178 |
* If 'sector_num' is beyond the end of the disk image the return value is 0
|
| 2179 |
* and 'pnum' is set to 0.
|
| 2180 |
*
|
| 2181 |
* 'pnum' is set to the number of sectors (including and immediately following
|
| 2182 |
* the specified sector) that are known to be in the same
|
| 2183 |
* allocated/unallocated state.
|
| 2184 |
*
|
| 2185 |
* 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
|
| 2186 |
* beyond the end of the disk image it will be clamped.
|
| 2187 |
*/
|
| 2188 |
int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
|
| 2189 |
int nb_sectors, int *pnum) |
| 2190 |
{
|
| 2191 |
int64_t n; |
| 2192 |
|
| 2193 |
if (sector_num >= bs->total_sectors) {
|
| 2194 |
*pnum = 0;
|
| 2195 |
return 0; |
| 2196 |
} |
| 2197 |
|
| 2198 |
n = bs->total_sectors - sector_num; |
| 2199 |
if (n < nb_sectors) {
|
| 2200 |
nb_sectors = n; |
| 2201 |
} |
| 2202 |
|
| 2203 |
if (!bs->drv->bdrv_co_is_allocated) {
|
| 2204 |
*pnum = nb_sectors; |
| 2205 |
return 1; |
| 2206 |
} |
| 2207 |
|
| 2208 |
return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum);
|
| 2209 |
} |
| 2210 |
|
| 2211 |
/* Coroutine wrapper for bdrv_is_allocated() */
|
| 2212 |
static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque) |
| 2213 |
{
|
| 2214 |
BdrvCoIsAllocatedData *data = opaque; |
| 2215 |
BlockDriverState *bs = data->bs; |
| 2216 |
|
| 2217 |
data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors, |
| 2218 |
data->pnum); |
| 2219 |
data->done = true;
|
| 2220 |
} |
| 2221 |
|
| 2222 |
/*
|
| 2223 |
* Synchronous wrapper around bdrv_co_is_allocated().
|
| 2224 |
*
|
| 2225 |
* See bdrv_co_is_allocated() for details.
|
| 2226 |
*/
|
| 2227 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
| 2228 |
int *pnum)
|
| 2229 |
{
|
| 2230 |
Coroutine *co; |
| 2231 |
BdrvCoIsAllocatedData data = {
|
| 2232 |
.bs = bs, |
| 2233 |
.sector_num = sector_num, |
| 2234 |
.nb_sectors = nb_sectors, |
| 2235 |
.pnum = pnum, |
| 2236 |
.done = false,
|
| 2237 |
}; |
| 2238 |
|
| 2239 |
co = qemu_coroutine_create(bdrv_is_allocated_co_entry); |
| 2240 |
qemu_coroutine_enter(co, &data); |
| 2241 |
while (!data.done) {
|
| 2242 |
qemu_aio_wait(); |
| 2243 |
} |
| 2244 |
return data.ret;
|
| 2245 |
} |
| 2246 |
|
| 2247 |
void bdrv_mon_event(const BlockDriverState *bdrv, |
| 2248 |
BlockMonEventAction action, int is_read)
|
| 2249 |
{
|
| 2250 |
QObject *data; |
| 2251 |
const char *action_str; |
| 2252 |
|
| 2253 |
switch (action) {
|
| 2254 |
case BDRV_ACTION_REPORT:
|
| 2255 |
action_str = "report";
|
| 2256 |
break;
|
| 2257 |
case BDRV_ACTION_IGNORE:
|
| 2258 |
action_str = "ignore";
|
| 2259 |
break;
|
| 2260 |
case BDRV_ACTION_STOP:
|
| 2261 |
action_str = "stop";
|
| 2262 |
break;
|
| 2263 |
default:
|
| 2264 |
abort(); |
| 2265 |
} |
| 2266 |
|
| 2267 |
data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
|
| 2268 |
bdrv->device_name, |
| 2269 |
action_str, |
| 2270 |
is_read ? "read" : "write"); |
| 2271 |
monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); |
| 2272 |
|
| 2273 |
qobject_decref(data); |
| 2274 |
} |
| 2275 |
|
| 2276 |
BlockInfoList *qmp_query_block(Error **errp) |
| 2277 |
{
|
| 2278 |
BlockInfoList *head = NULL, *cur_item = NULL; |
| 2279 |
BlockDriverState *bs; |
| 2280 |
|
| 2281 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 2282 |
BlockInfoList *info = g_malloc0(sizeof(*info));
|
| 2283 |
|
| 2284 |
info->value = g_malloc0(sizeof(*info->value));
|
| 2285 |
info->value->device = g_strdup(bs->device_name); |
| 2286 |
info->value->type = g_strdup("unknown");
|
| 2287 |
info->value->locked = bdrv_dev_is_medium_locked(bs); |
| 2288 |
info->value->removable = bdrv_dev_has_removable_media(bs); |
| 2289 |
|
| 2290 |
if (bdrv_dev_has_removable_media(bs)) {
|
| 2291 |
info->value->has_tray_open = true;
|
| 2292 |
info->value->tray_open = bdrv_dev_is_tray_open(bs); |
| 2293 |
} |
| 2294 |
|
| 2295 |
if (bdrv_iostatus_is_enabled(bs)) {
|
| 2296 |
info->value->has_io_status = true;
|
| 2297 |
info->value->io_status = bs->iostatus; |
| 2298 |
} |
| 2299 |
|
| 2300 |
if (bs->drv) {
|
| 2301 |
info->value->has_inserted = true;
|
| 2302 |
info->value->inserted = g_malloc0(sizeof(*info->value->inserted));
|
| 2303 |
info->value->inserted->file = g_strdup(bs->filename); |
| 2304 |
info->value->inserted->ro = bs->read_only; |
| 2305 |
info->value->inserted->drv = g_strdup(bs->drv->format_name); |
| 2306 |
info->value->inserted->encrypted = bs->encrypted; |
| 2307 |
if (bs->backing_file[0]) { |
| 2308 |
info->value->inserted->has_backing_file = true;
|
| 2309 |
info->value->inserted->backing_file = g_strdup(bs->backing_file); |
| 2310 |
} |
| 2311 |
|
| 2312 |
if (bs->io_limits_enabled) {
|
| 2313 |
info->value->inserted->bps = |
| 2314 |
bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; |
| 2315 |
info->value->inserted->bps_rd = |
| 2316 |
bs->io_limits.bps[BLOCK_IO_LIMIT_READ]; |
| 2317 |
info->value->inserted->bps_wr = |
| 2318 |
bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE]; |
| 2319 |
info->value->inserted->iops = |
| 2320 |
bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; |
| 2321 |
info->value->inserted->iops_rd = |
| 2322 |
bs->io_limits.iops[BLOCK_IO_LIMIT_READ]; |
| 2323 |
info->value->inserted->iops_wr = |
| 2324 |
bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE]; |
| 2325 |
} |
| 2326 |
} |
| 2327 |
|
| 2328 |
/* XXX: waiting for the qapi to support GSList */
|
| 2329 |
if (!cur_item) {
|
| 2330 |
head = cur_item = info; |
| 2331 |
} else {
|
| 2332 |
cur_item->next = info; |
| 2333 |
cur_item = info; |
| 2334 |
} |
| 2335 |
} |
| 2336 |
|
| 2337 |
return head;
|
| 2338 |
} |
| 2339 |
|
| 2340 |
/* Consider exposing this as a full fledged QMP command */
|
| 2341 |
static BlockStats *qmp_query_blockstat(const BlockDriverState *bs, Error **errp) |
| 2342 |
{
|
| 2343 |
BlockStats *s; |
| 2344 |
|
| 2345 |
s = g_malloc0(sizeof(*s));
|
| 2346 |
|
| 2347 |
if (bs->device_name[0]) { |
| 2348 |
s->has_device = true;
|
| 2349 |
s->device = g_strdup(bs->device_name); |
| 2350 |
} |
| 2351 |
|
| 2352 |
s->stats = g_malloc0(sizeof(*s->stats));
|
| 2353 |
s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ]; |
| 2354 |
s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE]; |
| 2355 |
s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ]; |
| 2356 |
s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE]; |
| 2357 |
s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE; |
| 2358 |
s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH]; |
| 2359 |
s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE]; |
| 2360 |
s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ]; |
| 2361 |
s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH]; |
| 2362 |
|
| 2363 |
if (bs->file) {
|
| 2364 |
s->has_parent = true;
|
| 2365 |
s->parent = qmp_query_blockstat(bs->file, NULL);
|
| 2366 |
} |
| 2367 |
|
| 2368 |
return s;
|
| 2369 |
} |
| 2370 |
|
| 2371 |
BlockStatsList *qmp_query_blockstats(Error **errp) |
| 2372 |
{
|
| 2373 |
BlockStatsList *head = NULL, *cur_item = NULL; |
| 2374 |
BlockDriverState *bs; |
| 2375 |
|
| 2376 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 2377 |
BlockStatsList *info = g_malloc0(sizeof(*info));
|
| 2378 |
info->value = qmp_query_blockstat(bs, NULL);
|
| 2379 |
|
| 2380 |
/* XXX: waiting for the qapi to support GSList */
|
| 2381 |
if (!cur_item) {
|
| 2382 |
head = cur_item = info; |
| 2383 |
} else {
|
| 2384 |
cur_item->next = info; |
| 2385 |
cur_item = info; |
| 2386 |
} |
| 2387 |
} |
| 2388 |
|
| 2389 |
return head;
|
| 2390 |
} |
| 2391 |
|
| 2392 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
| 2393 |
{
|
| 2394 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
| 2395 |
return bs->backing_file;
|
| 2396 |
else if (bs->encrypted) |
| 2397 |
return bs->filename;
|
| 2398 |
else
|
| 2399 |
return NULL; |
| 2400 |
} |
| 2401 |
|
| 2402 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
| 2403 |
char *filename, int filename_size) |
| 2404 |
{
|
| 2405 |
pstrcpy(filename, filename_size, bs->backing_file); |
| 2406 |
} |
| 2407 |
|
| 2408 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
| 2409 |
const uint8_t *buf, int nb_sectors) |
| 2410 |
{
|
| 2411 |
BlockDriver *drv = bs->drv; |
| 2412 |
if (!drv)
|
| 2413 |
return -ENOMEDIUM;
|
| 2414 |
if (!drv->bdrv_write_compressed)
|
| 2415 |
return -ENOTSUP;
|
| 2416 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 2417 |
return -EIO;
|
| 2418 |
|
| 2419 |
if (bs->dirty_bitmap) {
|
| 2420 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
| 2421 |
} |
| 2422 |
|
| 2423 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
| 2424 |
} |
| 2425 |
|
| 2426 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
| 2427 |
{
|
| 2428 |
BlockDriver *drv = bs->drv; |
| 2429 |
if (!drv)
|
| 2430 |
return -ENOMEDIUM;
|
| 2431 |
if (!drv->bdrv_get_info)
|
| 2432 |
return -ENOTSUP;
|
| 2433 |
memset(bdi, 0, sizeof(*bdi)); |
| 2434 |
return drv->bdrv_get_info(bs, bdi);
|
| 2435 |
} |
| 2436 |
|
| 2437 |
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
| 2438 |
int64_t pos, int size)
|
| 2439 |
{
|
| 2440 |
BlockDriver *drv = bs->drv; |
| 2441 |
if (!drv)
|
| 2442 |
return -ENOMEDIUM;
|
| 2443 |
if (drv->bdrv_save_vmstate)
|
| 2444 |
return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
| 2445 |
if (bs->file)
|
| 2446 |
return bdrv_save_vmstate(bs->file, buf, pos, size);
|
| 2447 |
return -ENOTSUP;
|
| 2448 |
} |
| 2449 |
|
| 2450 |
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
| 2451 |
int64_t pos, int size)
|
| 2452 |
{
|
| 2453 |
BlockDriver *drv = bs->drv; |
| 2454 |
if (!drv)
|
| 2455 |
return -ENOMEDIUM;
|
| 2456 |
if (drv->bdrv_load_vmstate)
|
| 2457 |
return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
| 2458 |
if (bs->file)
|
| 2459 |
return bdrv_load_vmstate(bs->file, buf, pos, size);
|
| 2460 |
return -ENOTSUP;
|
| 2461 |
} |
| 2462 |
|
| 2463 |
void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
|
| 2464 |
{
|
| 2465 |
BlockDriver *drv = bs->drv; |
| 2466 |
|
| 2467 |
if (!drv || !drv->bdrv_debug_event) {
|
| 2468 |
return;
|
| 2469 |
} |
| 2470 |
|
| 2471 |
return drv->bdrv_debug_event(bs, event);
|
| 2472 |
|
| 2473 |
} |
| 2474 |
|
| 2475 |
/**************************************************************/
|
| 2476 |
/* handling of snapshots */
|
| 2477 |
|
| 2478 |
int bdrv_can_snapshot(BlockDriverState *bs)
|
| 2479 |
{
|
| 2480 |
BlockDriver *drv = bs->drv; |
| 2481 |
if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
|
| 2482 |
return 0; |
| 2483 |
} |
| 2484 |
|
| 2485 |
if (!drv->bdrv_snapshot_create) {
|
| 2486 |
if (bs->file != NULL) { |
| 2487 |
return bdrv_can_snapshot(bs->file);
|
| 2488 |
} |
| 2489 |
return 0; |
| 2490 |
} |
| 2491 |
|
| 2492 |
return 1; |
| 2493 |
} |
| 2494 |
|
| 2495 |
int bdrv_is_snapshot(BlockDriverState *bs)
|
| 2496 |
{
|
| 2497 |
return !!(bs->open_flags & BDRV_O_SNAPSHOT);
|
| 2498 |
} |
| 2499 |
|
| 2500 |
BlockDriverState *bdrv_snapshots(void)
|
| 2501 |
{
|
| 2502 |
BlockDriverState *bs; |
| 2503 |
|
| 2504 |
if (bs_snapshots) {
|
| 2505 |
return bs_snapshots;
|
| 2506 |
} |
| 2507 |
|
| 2508 |
bs = NULL;
|
| 2509 |
while ((bs = bdrv_next(bs))) {
|
| 2510 |
if (bdrv_can_snapshot(bs)) {
|
| 2511 |
bs_snapshots = bs; |
| 2512 |
return bs;
|
| 2513 |
} |
| 2514 |
} |
| 2515 |
return NULL; |
| 2516 |
} |
| 2517 |
|
| 2518 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
| 2519 |
QEMUSnapshotInfo *sn_info) |
| 2520 |
{
|
| 2521 |
BlockDriver *drv = bs->drv; |
| 2522 |
if (!drv)
|
| 2523 |
return -ENOMEDIUM;
|
| 2524 |
if (drv->bdrv_snapshot_create)
|
| 2525 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
| 2526 |
if (bs->file)
|
| 2527 |
return bdrv_snapshot_create(bs->file, sn_info);
|
| 2528 |
return -ENOTSUP;
|
| 2529 |
} |
| 2530 |
|
| 2531 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
| 2532 |
const char *snapshot_id) |
| 2533 |
{
|
| 2534 |
BlockDriver *drv = bs->drv; |
| 2535 |
int ret, open_ret;
|
| 2536 |
|
| 2537 |
if (!drv)
|
| 2538 |
return -ENOMEDIUM;
|
| 2539 |
if (drv->bdrv_snapshot_goto)
|
| 2540 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
| 2541 |
|
| 2542 |
if (bs->file) {
|
| 2543 |
drv->bdrv_close(bs); |
| 2544 |
ret = bdrv_snapshot_goto(bs->file, snapshot_id); |
| 2545 |
open_ret = drv->bdrv_open(bs, bs->open_flags); |
| 2546 |
if (open_ret < 0) { |
| 2547 |
bdrv_delete(bs->file); |
| 2548 |
bs->drv = NULL;
|
| 2549 |
return open_ret;
|
| 2550 |
} |
| 2551 |
return ret;
|
| 2552 |
} |
| 2553 |
|
| 2554 |
return -ENOTSUP;
|
| 2555 |
} |
| 2556 |
|
| 2557 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
| 2558 |
{
|
| 2559 |
BlockDriver *drv = bs->drv; |
| 2560 |
if (!drv)
|
| 2561 |
return -ENOMEDIUM;
|
| 2562 |
if (drv->bdrv_snapshot_delete)
|
| 2563 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
| 2564 |
if (bs->file)
|
| 2565 |
return bdrv_snapshot_delete(bs->file, snapshot_id);
|
| 2566 |
return -ENOTSUP;
|
| 2567 |
} |
| 2568 |
|
| 2569 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
| 2570 |
QEMUSnapshotInfo **psn_info) |
| 2571 |
{
|
| 2572 |
BlockDriver *drv = bs->drv; |
| 2573 |
if (!drv)
|
| 2574 |
return -ENOMEDIUM;
|
| 2575 |
if (drv->bdrv_snapshot_list)
|
| 2576 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
| 2577 |
if (bs->file)
|
| 2578 |
return bdrv_snapshot_list(bs->file, psn_info);
|
| 2579 |
return -ENOTSUP;
|
| 2580 |
} |
| 2581 |
|
| 2582 |
int bdrv_snapshot_load_tmp(BlockDriverState *bs,
|
| 2583 |
const char *snapshot_name) |
| 2584 |
{
|
| 2585 |
BlockDriver *drv = bs->drv; |
| 2586 |
if (!drv) {
|
| 2587 |
return -ENOMEDIUM;
|
| 2588 |
} |
| 2589 |
if (!bs->read_only) {
|
| 2590 |
return -EINVAL;
|
| 2591 |
} |
| 2592 |
if (drv->bdrv_snapshot_load_tmp) {
|
| 2593 |
return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
|
| 2594 |
} |
| 2595 |
return -ENOTSUP;
|
| 2596 |
} |
| 2597 |
|
| 2598 |
BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
| 2599 |
const char *backing_file) |
| 2600 |
{
|
| 2601 |
if (!bs->drv) {
|
| 2602 |
return NULL; |
| 2603 |
} |
| 2604 |
|
| 2605 |
if (bs->backing_hd) {
|
| 2606 |
if (strcmp(bs->backing_file, backing_file) == 0) { |
| 2607 |
return bs->backing_hd;
|
| 2608 |
} else {
|
| 2609 |
return bdrv_find_backing_image(bs->backing_hd, backing_file);
|
| 2610 |
} |
| 2611 |
} |
| 2612 |
|
| 2613 |
return NULL; |
| 2614 |
} |
| 2615 |
|
| 2616 |
#define NB_SUFFIXES 4 |
| 2617 |
|
| 2618 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
| 2619 |
{
|
| 2620 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
| 2621 |
int64_t base; |
| 2622 |
int i;
|
| 2623 |
|
| 2624 |
if (size <= 999) { |
| 2625 |
snprintf(buf, buf_size, "%" PRId64, size);
|
| 2626 |
} else {
|
| 2627 |
base = 1024;
|
| 2628 |
for(i = 0; i < NB_SUFFIXES; i++) { |
| 2629 |
if (size < (10 * base)) { |
| 2630 |
snprintf(buf, buf_size, "%0.1f%c",
|
| 2631 |
(double)size / base,
|
| 2632 |
suffixes[i]); |
| 2633 |
break;
|
| 2634 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
| 2635 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
| 2636 |
((size + (base >> 1)) / base),
|
| 2637 |
suffixes[i]); |
| 2638 |
break;
|
| 2639 |
} |
| 2640 |
base = base * 1024;
|
| 2641 |
} |
| 2642 |
} |
| 2643 |
return buf;
|
| 2644 |
} |
| 2645 |
|
| 2646 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
| 2647 |
{
|
| 2648 |
char buf1[128], date_buf[128], clock_buf[128]; |
| 2649 |
#ifdef _WIN32
|
| 2650 |
struct tm *ptm;
|
| 2651 |
#else
|
| 2652 |
struct tm tm;
|
| 2653 |
#endif
|
| 2654 |
time_t ti; |
| 2655 |
int64_t secs; |
| 2656 |
|
| 2657 |
if (!sn) {
|
| 2658 |
snprintf(buf, buf_size, |
| 2659 |
"%-10s%-20s%7s%20s%15s",
|
| 2660 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
| 2661 |
} else {
|
| 2662 |
ti = sn->date_sec; |
| 2663 |
#ifdef _WIN32
|
| 2664 |
ptm = localtime(&ti); |
| 2665 |
strftime(date_buf, sizeof(date_buf),
|
| 2666 |
"%Y-%m-%d %H:%M:%S", ptm);
|
| 2667 |
#else
|
| 2668 |
localtime_r(&ti, &tm); |
| 2669 |
strftime(date_buf, sizeof(date_buf),
|
| 2670 |
"%Y-%m-%d %H:%M:%S", &tm);
|
| 2671 |
#endif
|
| 2672 |
secs = sn->vm_clock_nsec / 1000000000;
|
| 2673 |
snprintf(clock_buf, sizeof(clock_buf),
|
| 2674 |
"%02d:%02d:%02d.%03d",
|
| 2675 |
(int)(secs / 3600), |
| 2676 |
(int)((secs / 60) % 60), |
| 2677 |
(int)(secs % 60), |
| 2678 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
| 2679 |
snprintf(buf, buf_size, |
| 2680 |
"%-10s%-20s%7s%20s%15s",
|
| 2681 |
sn->id_str, sn->name, |
| 2682 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
| 2683 |
date_buf, |
| 2684 |
clock_buf); |
| 2685 |
} |
| 2686 |
return buf;
|
| 2687 |
} |
| 2688 |
|
| 2689 |
/**************************************************************/
|
| 2690 |
/* async I/Os */
|
| 2691 |
|
| 2692 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
| 2693 |
QEMUIOVector *qiov, int nb_sectors,
|
| 2694 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 2695 |
{
|
| 2696 |
trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
| 2697 |
|
| 2698 |
return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors,
|
| 2699 |
cb, opaque, false);
|
| 2700 |
} |
| 2701 |
|
| 2702 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
| 2703 |
QEMUIOVector *qiov, int nb_sectors,
|
| 2704 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 2705 |
{
|
| 2706 |
trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
| 2707 |
|
| 2708 |
return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors,
|
| 2709 |
cb, opaque, true);
|
| 2710 |
} |
| 2711 |
|
| 2712 |
|
| 2713 |
typedef struct MultiwriteCB { |
| 2714 |
int error;
|
| 2715 |
int num_requests;
|
| 2716 |
int num_callbacks;
|
| 2717 |
struct {
|
| 2718 |
BlockDriverCompletionFunc *cb; |
| 2719 |
void *opaque;
|
| 2720 |
QEMUIOVector *free_qiov; |
| 2721 |
void *free_buf;
|
| 2722 |
} callbacks[]; |
| 2723 |
} MultiwriteCB; |
| 2724 |
|
| 2725 |
static void multiwrite_user_cb(MultiwriteCB *mcb) |
| 2726 |
{
|
| 2727 |
int i;
|
| 2728 |
|
| 2729 |
for (i = 0; i < mcb->num_callbacks; i++) { |
| 2730 |
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
| 2731 |
if (mcb->callbacks[i].free_qiov) {
|
| 2732 |
qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
| 2733 |
} |
| 2734 |
g_free(mcb->callbacks[i].free_qiov); |
| 2735 |
qemu_vfree(mcb->callbacks[i].free_buf); |
| 2736 |
} |
| 2737 |
} |
| 2738 |
|
| 2739 |
static void multiwrite_cb(void *opaque, int ret) |
| 2740 |
{
|
| 2741 |
MultiwriteCB *mcb = opaque; |
| 2742 |
|
| 2743 |
trace_multiwrite_cb(mcb, ret); |
| 2744 |
|
| 2745 |
if (ret < 0 && !mcb->error) { |
| 2746 |
mcb->error = ret; |
| 2747 |
} |
| 2748 |
|
| 2749 |
mcb->num_requests--; |
| 2750 |
if (mcb->num_requests == 0) { |
| 2751 |
multiwrite_user_cb(mcb); |
| 2752 |
g_free(mcb); |
| 2753 |
} |
| 2754 |
} |
| 2755 |
|
| 2756 |
static int multiwrite_req_compare(const void *a, const void *b) |
| 2757 |
{
|
| 2758 |
const BlockRequest *req1 = a, *req2 = b;
|
| 2759 |
|
| 2760 |
/*
|
| 2761 |
* Note that we can't simply subtract req2->sector from req1->sector
|
| 2762 |
* here as that could overflow the return value.
|
| 2763 |
*/
|
| 2764 |
if (req1->sector > req2->sector) {
|
| 2765 |
return 1; |
| 2766 |
} else if (req1->sector < req2->sector) { |
| 2767 |
return -1; |
| 2768 |
} else {
|
| 2769 |
return 0; |
| 2770 |
} |
| 2771 |
} |
| 2772 |
|
| 2773 |
/*
|
| 2774 |
* Takes a bunch of requests and tries to merge them. Returns the number of
|
| 2775 |
* requests that remain after merging.
|
| 2776 |
*/
|
| 2777 |
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
| 2778 |
int num_reqs, MultiwriteCB *mcb)
|
| 2779 |
{
|
| 2780 |
int i, outidx;
|
| 2781 |
|
| 2782 |
// Sort requests by start sector
|
| 2783 |
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
| 2784 |
|
| 2785 |
// Check if adjacent requests touch the same clusters. If so, combine them,
|
| 2786 |
// filling up gaps with zero sectors.
|
| 2787 |
outidx = 0;
|
| 2788 |
for (i = 1; i < num_reqs; i++) { |
| 2789 |
int merge = 0; |
| 2790 |
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
| 2791 |
|
| 2792 |
// This handles the cases that are valid for all block drivers, namely
|
| 2793 |
// exactly sequential writes and overlapping writes.
|
| 2794 |
if (reqs[i].sector <= oldreq_last) {
|
| 2795 |
merge = 1;
|
| 2796 |
} |
| 2797 |
|
| 2798 |
// The block driver may decide that it makes sense to combine requests
|
| 2799 |
// even if there is a gap of some sectors between them. In this case,
|
| 2800 |
// the gap is filled with zeros (therefore only applicable for yet
|
| 2801 |
// unused space in format like qcow2).
|
| 2802 |
if (!merge && bs->drv->bdrv_merge_requests) {
|
| 2803 |
merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
| 2804 |
} |
| 2805 |
|
| 2806 |
if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
| 2807 |
merge = 0;
|
| 2808 |
} |
| 2809 |
|
| 2810 |
if (merge) {
|
| 2811 |
size_t size; |
| 2812 |
QEMUIOVector *qiov = g_malloc0(sizeof(*qiov));
|
| 2813 |
qemu_iovec_init(qiov, |
| 2814 |
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
| 2815 |
|
| 2816 |
// Add the first request to the merged one. If the requests are
|
| 2817 |
// overlapping, drop the last sectors of the first request.
|
| 2818 |
size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
| 2819 |
qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
| 2820 |
|
| 2821 |
// We might need to add some zeros between the two requests
|
| 2822 |
if (reqs[i].sector > oldreq_last) {
|
| 2823 |
size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
|
| 2824 |
uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
| 2825 |
memset(buf, 0, zero_bytes);
|
| 2826 |
qemu_iovec_add(qiov, buf, zero_bytes); |
| 2827 |
mcb->callbacks[i].free_buf = buf; |
| 2828 |
} |
| 2829 |
|
| 2830 |
// Add the second request
|
| 2831 |
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
| 2832 |
|
| 2833 |
reqs[outidx].nb_sectors = qiov->size >> 9;
|
| 2834 |
reqs[outidx].qiov = qiov; |
| 2835 |
|
| 2836 |
mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
| 2837 |
} else {
|
| 2838 |
outidx++; |
| 2839 |
reqs[outidx].sector = reqs[i].sector; |
| 2840 |
reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
| 2841 |
reqs[outidx].qiov = reqs[i].qiov; |
| 2842 |
} |
| 2843 |
} |
| 2844 |
|
| 2845 |
return outidx + 1; |
| 2846 |
} |
| 2847 |
|
| 2848 |
/*
|
| 2849 |
* Submit multiple AIO write requests at once.
|
| 2850 |
*
|
| 2851 |
* On success, the function returns 0 and all requests in the reqs array have
|
| 2852 |
* been submitted. In error case this function returns -1, and any of the
|
| 2853 |
* requests may or may not be submitted yet. In particular, this means that the
|
| 2854 |
* callback will be called for some of the requests, for others it won't. The
|
| 2855 |
* caller must check the error field of the BlockRequest to wait for the right
|
| 2856 |
* callbacks (if error != 0, no callback will be called).
|
| 2857 |
*
|
| 2858 |
* The implementation may modify the contents of the reqs array, e.g. to merge
|
| 2859 |
* requests. However, the fields opaque and error are left unmodified as they
|
| 2860 |
* are used to signal failure for a single request to the caller.
|
| 2861 |
*/
|
| 2862 |
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
| 2863 |
{
|
| 2864 |
MultiwriteCB *mcb; |
| 2865 |
int i;
|
| 2866 |
|
| 2867 |
/* don't submit writes if we don't have a medium */
|
| 2868 |
if (bs->drv == NULL) { |
| 2869 |
for (i = 0; i < num_reqs; i++) { |
| 2870 |
reqs[i].error = -ENOMEDIUM; |
| 2871 |
} |
| 2872 |
return -1; |
| 2873 |
} |
| 2874 |
|
| 2875 |
if (num_reqs == 0) { |
| 2876 |
return 0; |
| 2877 |
} |
| 2878 |
|
| 2879 |
// Create MultiwriteCB structure
|
| 2880 |
mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
| 2881 |
mcb->num_requests = 0;
|
| 2882 |
mcb->num_callbacks = num_reqs; |
| 2883 |
|
| 2884 |
for (i = 0; i < num_reqs; i++) { |
| 2885 |
mcb->callbacks[i].cb = reqs[i].cb; |
| 2886 |
mcb->callbacks[i].opaque = reqs[i].opaque; |
| 2887 |
} |
| 2888 |
|
| 2889 |
// Check for mergable requests
|
| 2890 |
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
| 2891 |
|
| 2892 |
trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
| 2893 |
|
| 2894 |
/* Run the aio requests. */
|
| 2895 |
mcb->num_requests = num_reqs; |
| 2896 |
for (i = 0; i < num_reqs; i++) { |
| 2897 |
bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
| 2898 |
reqs[i].nb_sectors, multiwrite_cb, mcb); |
| 2899 |
} |
| 2900 |
|
| 2901 |
return 0; |
| 2902 |
} |
| 2903 |
|
| 2904 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
| 2905 |
{
|
| 2906 |
acb->pool->cancel(acb); |
| 2907 |
} |
| 2908 |
|
| 2909 |
/* block I/O throttling */
|
| 2910 |
static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, |
| 2911 |
bool is_write, double elapsed_time, uint64_t *wait) |
| 2912 |
{
|
| 2913 |
uint64_t bps_limit = 0;
|
| 2914 |
double bytes_limit, bytes_base, bytes_res;
|
| 2915 |
double slice_time, wait_time;
|
| 2916 |
|
| 2917 |
if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) {
|
| 2918 |
bps_limit = bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; |
| 2919 |
} else if (bs->io_limits.bps[is_write]) { |
| 2920 |
bps_limit = bs->io_limits.bps[is_write]; |
| 2921 |
} else {
|
| 2922 |
if (wait) {
|
| 2923 |
*wait = 0;
|
| 2924 |
} |
| 2925 |
|
| 2926 |
return false; |
| 2927 |
} |
| 2928 |
|
| 2929 |
slice_time = bs->slice_end - bs->slice_start; |
| 2930 |
slice_time /= (NANOSECONDS_PER_SECOND); |
| 2931 |
bytes_limit = bps_limit * slice_time; |
| 2932 |
bytes_base = bs->nr_bytes[is_write] - bs->io_base.bytes[is_write]; |
| 2933 |
if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) {
|
| 2934 |
bytes_base += bs->nr_bytes[!is_write] - bs->io_base.bytes[!is_write]; |
| 2935 |
} |
| 2936 |
|
| 2937 |
/* bytes_base: the bytes of data which have been read/written; and
|
| 2938 |
* it is obtained from the history statistic info.
|
| 2939 |
* bytes_res: the remaining bytes of data which need to be read/written.
|
| 2940 |
* (bytes_base + bytes_res) / bps_limit: used to calcuate
|
| 2941 |
* the total time for completing reading/writting all data.
|
| 2942 |
*/
|
| 2943 |
bytes_res = (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
| 2944 |
|
| 2945 |
if (bytes_base + bytes_res <= bytes_limit) {
|
| 2946 |
if (wait) {
|
| 2947 |
*wait = 0;
|
| 2948 |
} |
| 2949 |
|
| 2950 |
return false; |
| 2951 |
} |
| 2952 |
|
| 2953 |
/* Calc approx time to dispatch */
|
| 2954 |
wait_time = (bytes_base + bytes_res) / bps_limit - elapsed_time; |
| 2955 |
|
| 2956 |
/* When the I/O rate at runtime exceeds the limits,
|
| 2957 |
* bs->slice_end need to be extended in order that the current statistic
|
| 2958 |
* info can be kept until the timer fire, so it is increased and tuned
|
| 2959 |
* based on the result of experiment.
|
| 2960 |
*/
|
| 2961 |
bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
| 2962 |
bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME;
|
| 2963 |
if (wait) {
|
| 2964 |
*wait = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
| 2965 |
} |
| 2966 |
|
| 2967 |
return true; |
| 2968 |
} |
| 2969 |
|
| 2970 |
static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, |
| 2971 |
double elapsed_time, uint64_t *wait)
|
| 2972 |
{
|
| 2973 |
uint64_t iops_limit = 0;
|
| 2974 |
double ios_limit, ios_base;
|
| 2975 |
double slice_time, wait_time;
|
| 2976 |
|
| 2977 |
if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) {
|
| 2978 |
iops_limit = bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; |
| 2979 |
} else if (bs->io_limits.iops[is_write]) { |
| 2980 |
iops_limit = bs->io_limits.iops[is_write]; |
| 2981 |
} else {
|
| 2982 |
if (wait) {
|
| 2983 |
*wait = 0;
|
| 2984 |
} |
| 2985 |
|
| 2986 |
return false; |
| 2987 |
} |
| 2988 |
|
| 2989 |
slice_time = bs->slice_end - bs->slice_start; |
| 2990 |
slice_time /= (NANOSECONDS_PER_SECOND); |
| 2991 |
ios_limit = iops_limit * slice_time; |
| 2992 |
ios_base = bs->nr_ops[is_write] - bs->io_base.ios[is_write]; |
| 2993 |
if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) {
|
| 2994 |
ios_base += bs->nr_ops[!is_write] - bs->io_base.ios[!is_write]; |
| 2995 |
} |
| 2996 |
|
| 2997 |
if (ios_base + 1 <= ios_limit) { |
| 2998 |
if (wait) {
|
| 2999 |
*wait = 0;
|
| 3000 |
} |
| 3001 |
|
| 3002 |
return false; |
| 3003 |
} |
| 3004 |
|
| 3005 |
/* Calc approx time to dispatch */
|
| 3006 |
wait_time = (ios_base + 1) / iops_limit;
|
| 3007 |
if (wait_time > elapsed_time) {
|
| 3008 |
wait_time = wait_time - elapsed_time; |
| 3009 |
} else {
|
| 3010 |
wait_time = 0;
|
| 3011 |
} |
| 3012 |
|
| 3013 |
bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
| 3014 |
bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME;
|
| 3015 |
if (wait) {
|
| 3016 |
*wait = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
| 3017 |
} |
| 3018 |
|
| 3019 |
return true; |
| 3020 |
} |
| 3021 |
|
| 3022 |
static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, |
| 3023 |
bool is_write, int64_t *wait)
|
| 3024 |
{
|
| 3025 |
int64_t now, max_wait; |
| 3026 |
uint64_t bps_wait = 0, iops_wait = 0; |
| 3027 |
double elapsed_time;
|
| 3028 |
int bps_ret, iops_ret;
|
| 3029 |
|
| 3030 |
now = qemu_get_clock_ns(vm_clock); |
| 3031 |
if ((bs->slice_start < now)
|
| 3032 |
&& (bs->slice_end > now)) {
|
| 3033 |
bs->slice_end = now + bs->slice_time; |
| 3034 |
} else {
|
| 3035 |
bs->slice_time = 5 * BLOCK_IO_SLICE_TIME;
|
| 3036 |
bs->slice_start = now; |
| 3037 |
bs->slice_end = now + bs->slice_time; |
| 3038 |
|
| 3039 |
bs->io_base.bytes[is_write] = bs->nr_bytes[is_write]; |
| 3040 |
bs->io_base.bytes[!is_write] = bs->nr_bytes[!is_write]; |
| 3041 |
|
| 3042 |
bs->io_base.ios[is_write] = bs->nr_ops[is_write]; |
| 3043 |
bs->io_base.ios[!is_write] = bs->nr_ops[!is_write]; |
| 3044 |
} |
| 3045 |
|
| 3046 |
elapsed_time = now - bs->slice_start; |
| 3047 |
elapsed_time /= (NANOSECONDS_PER_SECOND); |
| 3048 |
|
| 3049 |
bps_ret = bdrv_exceed_bps_limits(bs, nb_sectors, |
| 3050 |
is_write, elapsed_time, &bps_wait); |
| 3051 |
iops_ret = bdrv_exceed_iops_limits(bs, is_write, |
| 3052 |
elapsed_time, &iops_wait); |
| 3053 |
if (bps_ret || iops_ret) {
|
| 3054 |
max_wait = bps_wait > iops_wait ? bps_wait : iops_wait; |
| 3055 |
if (wait) {
|
| 3056 |
*wait = max_wait; |
| 3057 |
} |
| 3058 |
|
| 3059 |
now = qemu_get_clock_ns(vm_clock); |
| 3060 |
if (bs->slice_end < now + max_wait) {
|
| 3061 |
bs->slice_end = now + max_wait; |
| 3062 |
} |
| 3063 |
|
| 3064 |
return true; |
| 3065 |
} |
| 3066 |
|
| 3067 |
if (wait) {
|
| 3068 |
*wait = 0;
|
| 3069 |
} |
| 3070 |
|
| 3071 |
return false; |
| 3072 |
} |
| 3073 |
|
| 3074 |
/**************************************************************/
|
| 3075 |
/* async block device emulation */
|
| 3076 |
|
| 3077 |
typedef struct BlockDriverAIOCBSync { |
| 3078 |
BlockDriverAIOCB common; |
| 3079 |
QEMUBH *bh; |
| 3080 |
int ret;
|
| 3081 |
/* vector translation state */
|
| 3082 |
QEMUIOVector *qiov; |
| 3083 |
uint8_t *bounce; |
| 3084 |
int is_write;
|
| 3085 |
} BlockDriverAIOCBSync; |
| 3086 |
|
| 3087 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
| 3088 |
{
|
| 3089 |
BlockDriverAIOCBSync *acb = |
| 3090 |
container_of(blockacb, BlockDriverAIOCBSync, common); |
| 3091 |
qemu_bh_delete(acb->bh); |
| 3092 |
acb->bh = NULL;
|
| 3093 |
qemu_aio_release(acb); |
| 3094 |
} |
| 3095 |
|
| 3096 |
static AIOPool bdrv_em_aio_pool = {
|
| 3097 |
.aiocb_size = sizeof(BlockDriverAIOCBSync),
|
| 3098 |
.cancel = bdrv_aio_cancel_em, |
| 3099 |
}; |
| 3100 |
|
| 3101 |
static void bdrv_aio_bh_cb(void *opaque) |
| 3102 |
{
|
| 3103 |
BlockDriverAIOCBSync *acb = opaque; |
| 3104 |
|
| 3105 |
if (!acb->is_write)
|
| 3106 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
| 3107 |
qemu_vfree(acb->bounce); |
| 3108 |
acb->common.cb(acb->common.opaque, acb->ret); |
| 3109 |
qemu_bh_delete(acb->bh); |
| 3110 |
acb->bh = NULL;
|
| 3111 |
qemu_aio_release(acb); |
| 3112 |
} |
| 3113 |
|
| 3114 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
| 3115 |
int64_t sector_num, |
| 3116 |
QEMUIOVector *qiov, |
| 3117 |
int nb_sectors,
|
| 3118 |
BlockDriverCompletionFunc *cb, |
| 3119 |
void *opaque,
|
| 3120 |
int is_write)
|
| 3121 |
|
| 3122 |
{
|
| 3123 |
BlockDriverAIOCBSync *acb; |
| 3124 |
|
| 3125 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
| 3126 |
acb->is_write = is_write; |
| 3127 |
acb->qiov = qiov; |
| 3128 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
| 3129 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 3130 |
|
| 3131 |
if (is_write) {
|
| 3132 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
| 3133 |
acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
| 3134 |
} else {
|
| 3135 |
acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
| 3136 |
} |
| 3137 |
|
| 3138 |
qemu_bh_schedule(acb->bh); |
| 3139 |
|
| 3140 |
return &acb->common;
|
| 3141 |
} |
| 3142 |
|
| 3143 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
| 3144 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
| 3145 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 3146 |
{
|
| 3147 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
| 3148 |
} |
| 3149 |
|
| 3150 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
| 3151 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
| 3152 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 3153 |
{
|
| 3154 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
| 3155 |
} |
| 3156 |
|
| 3157 |
|
| 3158 |
typedef struct BlockDriverAIOCBCoroutine { |
| 3159 |
BlockDriverAIOCB common; |
| 3160 |
BlockRequest req; |
| 3161 |
bool is_write;
|
| 3162 |
QEMUBH* bh; |
| 3163 |
} BlockDriverAIOCBCoroutine; |
| 3164 |
|
| 3165 |
static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) |
| 3166 |
{
|
| 3167 |
qemu_aio_flush(); |
| 3168 |
} |
| 3169 |
|
| 3170 |
static AIOPool bdrv_em_co_aio_pool = {
|
| 3171 |
.aiocb_size = sizeof(BlockDriverAIOCBCoroutine),
|
| 3172 |
.cancel = bdrv_aio_co_cancel_em, |
| 3173 |
}; |
| 3174 |
|
| 3175 |
static void bdrv_co_em_bh(void *opaque) |
| 3176 |
{
|
| 3177 |
BlockDriverAIOCBCoroutine *acb = opaque; |
| 3178 |
|
| 3179 |
acb->common.cb(acb->common.opaque, acb->req.error); |
| 3180 |
qemu_bh_delete(acb->bh); |
| 3181 |
qemu_aio_release(acb); |
| 3182 |
} |
| 3183 |
|
| 3184 |
/* Invoke bdrv_co_do_readv/bdrv_co_do_writev */
|
| 3185 |
static void coroutine_fn bdrv_co_do_rw(void *opaque) |
| 3186 |
{
|
| 3187 |
BlockDriverAIOCBCoroutine *acb = opaque; |
| 3188 |
BlockDriverState *bs = acb->common.bs; |
| 3189 |
|
| 3190 |
if (!acb->is_write) {
|
| 3191 |
acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, |
| 3192 |
acb->req.nb_sectors, acb->req.qiov, 0);
|
| 3193 |
} else {
|
| 3194 |
acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, |
| 3195 |
acb->req.nb_sectors, acb->req.qiov); |
| 3196 |
} |
| 3197 |
|
| 3198 |
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
| 3199 |
qemu_bh_schedule(acb->bh); |
| 3200 |
} |
| 3201 |
|
| 3202 |
static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs,
|
| 3203 |
int64_t sector_num, |
| 3204 |
QEMUIOVector *qiov, |
| 3205 |
int nb_sectors,
|
| 3206 |
BlockDriverCompletionFunc *cb, |
| 3207 |
void *opaque,
|
| 3208 |
bool is_write)
|
| 3209 |
{
|
| 3210 |
Coroutine *co; |
| 3211 |
BlockDriverAIOCBCoroutine *acb; |
| 3212 |
|
| 3213 |
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
| 3214 |
acb->req.sector = sector_num; |
| 3215 |
acb->req.nb_sectors = nb_sectors; |
| 3216 |
acb->req.qiov = qiov; |
| 3217 |
acb->is_write = is_write; |
| 3218 |
|
| 3219 |
co = qemu_coroutine_create(bdrv_co_do_rw); |
| 3220 |
qemu_coroutine_enter(co, acb); |
| 3221 |
|
| 3222 |
return &acb->common;
|
| 3223 |
} |
| 3224 |
|
| 3225 |
static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
| 3226 |
{
|
| 3227 |
BlockDriverAIOCBCoroutine *acb = opaque; |
| 3228 |
BlockDriverState *bs = acb->common.bs; |
| 3229 |
|
| 3230 |
acb->req.error = bdrv_co_flush(bs); |
| 3231 |
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
| 3232 |
qemu_bh_schedule(acb->bh); |
| 3233 |
} |
| 3234 |
|
| 3235 |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
| 3236 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 3237 |
{
|
| 3238 |
trace_bdrv_aio_flush(bs, opaque); |
| 3239 |
|
| 3240 |
Coroutine *co; |
| 3241 |
BlockDriverAIOCBCoroutine *acb; |
| 3242 |
|
| 3243 |
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
| 3244 |
co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
| 3245 |
qemu_coroutine_enter(co, acb); |
| 3246 |
|
| 3247 |
return &acb->common;
|
| 3248 |
} |
| 3249 |
|
| 3250 |
static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
| 3251 |
{
|
| 3252 |
BlockDriverAIOCBCoroutine *acb = opaque; |
| 3253 |
BlockDriverState *bs = acb->common.bs; |
| 3254 |
|
| 3255 |
acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); |
| 3256 |
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
| 3257 |
qemu_bh_schedule(acb->bh); |
| 3258 |
} |
| 3259 |
|
| 3260 |
BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, |
| 3261 |
int64_t sector_num, int nb_sectors,
|
| 3262 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 3263 |
{
|
| 3264 |
Coroutine *co; |
| 3265 |
BlockDriverAIOCBCoroutine *acb; |
| 3266 |
|
| 3267 |
trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); |
| 3268 |
|
| 3269 |
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
| 3270 |
acb->req.sector = sector_num; |
| 3271 |
acb->req.nb_sectors = nb_sectors; |
| 3272 |
co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
| 3273 |
qemu_coroutine_enter(co, acb); |
| 3274 |
|
| 3275 |
return &acb->common;
|
| 3276 |
} |
| 3277 |
|
| 3278 |
void bdrv_init(void) |
| 3279 |
{
|
| 3280 |
module_call_init(MODULE_INIT_BLOCK); |
| 3281 |
} |
| 3282 |
|
| 3283 |
void bdrv_init_with_whitelist(void) |
| 3284 |
{
|
| 3285 |
use_bdrv_whitelist = 1;
|
| 3286 |
bdrv_init(); |
| 3287 |
} |
| 3288 |
|
| 3289 |
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
| 3290 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 3291 |
{
|
| 3292 |
BlockDriverAIOCB *acb; |
| 3293 |
|
| 3294 |
if (pool->free_aiocb) {
|
| 3295 |
acb = pool->free_aiocb; |
| 3296 |
pool->free_aiocb = acb->next; |
| 3297 |
} else {
|
| 3298 |
acb = g_malloc0(pool->aiocb_size); |
| 3299 |
acb->pool = pool; |
| 3300 |
} |
| 3301 |
acb->bs = bs; |
| 3302 |
acb->cb = cb; |
| 3303 |
acb->opaque = opaque; |
| 3304 |
return acb;
|
| 3305 |
} |
| 3306 |
|
| 3307 |
void qemu_aio_release(void *p) |
| 3308 |
{
|
| 3309 |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
| 3310 |
AIOPool *pool = acb->pool; |
| 3311 |
acb->next = pool->free_aiocb; |
| 3312 |
pool->free_aiocb = acb; |
| 3313 |
} |
| 3314 |
|
| 3315 |
/**************************************************************/
|
| 3316 |
/* Coroutine block device emulation */
|
| 3317 |
|
| 3318 |
typedef struct CoroutineIOCompletion { |
| 3319 |
Coroutine *coroutine; |
| 3320 |
int ret;
|
| 3321 |
} CoroutineIOCompletion; |
| 3322 |
|
| 3323 |
static void bdrv_co_io_em_complete(void *opaque, int ret) |
| 3324 |
{
|
| 3325 |
CoroutineIOCompletion *co = opaque; |
| 3326 |
|
| 3327 |
co->ret = ret; |
| 3328 |
qemu_coroutine_enter(co->coroutine, NULL);
|
| 3329 |
} |
| 3330 |
|
| 3331 |
static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, |
| 3332 |
int nb_sectors, QEMUIOVector *iov,
|
| 3333 |
bool is_write)
|
| 3334 |
{
|
| 3335 |
CoroutineIOCompletion co = {
|
| 3336 |
.coroutine = qemu_coroutine_self(), |
| 3337 |
}; |
| 3338 |
BlockDriverAIOCB *acb; |
| 3339 |
|
| 3340 |
if (is_write) {
|
| 3341 |
acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
| 3342 |
bdrv_co_io_em_complete, &co); |
| 3343 |
} else {
|
| 3344 |
acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
| 3345 |
bdrv_co_io_em_complete, &co); |
| 3346 |
} |
| 3347 |
|
| 3348 |
trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
| 3349 |
if (!acb) {
|
| 3350 |
return -EIO;
|
| 3351 |
} |
| 3352 |
qemu_coroutine_yield(); |
| 3353 |
|
| 3354 |
return co.ret;
|
| 3355 |
} |
| 3356 |
|
| 3357 |
static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
| 3358 |
int64_t sector_num, int nb_sectors,
|
| 3359 |
QEMUIOVector *iov) |
| 3360 |
{
|
| 3361 |
return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); |
| 3362 |
} |
| 3363 |
|
| 3364 |
static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, |
| 3365 |
int64_t sector_num, int nb_sectors,
|
| 3366 |
QEMUIOVector *iov) |
| 3367 |
{
|
| 3368 |
return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); |
| 3369 |
} |
| 3370 |
|
| 3371 |
static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
| 3372 |
{
|
| 3373 |
RwCo *rwco = opaque; |
| 3374 |
|
| 3375 |
rwco->ret = bdrv_co_flush(rwco->bs); |
| 3376 |
} |
| 3377 |
|
| 3378 |
int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
|
| 3379 |
{
|
| 3380 |
int ret;
|
| 3381 |
|
| 3382 |
if (!bs->drv) {
|
| 3383 |
return 0; |
| 3384 |
} |
| 3385 |
|
| 3386 |
/* Write back cached data to the OS even with cache=unsafe */
|
| 3387 |
if (bs->drv->bdrv_co_flush_to_os) {
|
| 3388 |
ret = bs->drv->bdrv_co_flush_to_os(bs); |
| 3389 |
if (ret < 0) { |
| 3390 |
return ret;
|
| 3391 |
} |
| 3392 |
} |
| 3393 |
|
| 3394 |
/* But don't actually force it to the disk with cache=unsafe */
|
| 3395 |
if (bs->open_flags & BDRV_O_NO_FLUSH) {
|
| 3396 |
return 0; |
| 3397 |
} |
| 3398 |
|
| 3399 |
if (bs->drv->bdrv_co_flush_to_disk) {
|
| 3400 |
return bs->drv->bdrv_co_flush_to_disk(bs);
|
| 3401 |
} else if (bs->drv->bdrv_aio_flush) { |
| 3402 |
BlockDriverAIOCB *acb; |
| 3403 |
CoroutineIOCompletion co = {
|
| 3404 |
.coroutine = qemu_coroutine_self(), |
| 3405 |
}; |
| 3406 |
|
| 3407 |
acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); |
| 3408 |
if (acb == NULL) { |
| 3409 |
return -EIO;
|
| 3410 |
} else {
|
| 3411 |
qemu_coroutine_yield(); |
| 3412 |
return co.ret;
|
| 3413 |
} |
| 3414 |
} else {
|
| 3415 |
/*
|
| 3416 |
* Some block drivers always operate in either writethrough or unsafe
|
| 3417 |
* mode and don't support bdrv_flush therefore. Usually qemu doesn't
|
| 3418 |
* know how the server works (because the behaviour is hardcoded or
|
| 3419 |
* depends on server-side configuration), so we can't ensure that
|
| 3420 |
* everything is safe on disk. Returning an error doesn't work because
|
| 3421 |
* that would break guests even if the server operates in writethrough
|
| 3422 |
* mode.
|
| 3423 |
*
|
| 3424 |
* Let's hope the user knows what he's doing.
|
| 3425 |
*/
|
| 3426 |
return 0; |
| 3427 |
} |
| 3428 |
} |
| 3429 |
|
| 3430 |
void bdrv_invalidate_cache(BlockDriverState *bs)
|
| 3431 |
{
|
| 3432 |
if (bs->drv && bs->drv->bdrv_invalidate_cache) {
|
| 3433 |
bs->drv->bdrv_invalidate_cache(bs); |
| 3434 |
} |
| 3435 |
} |
| 3436 |
|
| 3437 |
void bdrv_invalidate_cache_all(void) |
| 3438 |
{
|
| 3439 |
BlockDriverState *bs; |
| 3440 |
|
| 3441 |
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
| 3442 |
bdrv_invalidate_cache(bs); |
| 3443 |
} |
| 3444 |
} |
| 3445 |
|
| 3446 |
int bdrv_flush(BlockDriverState *bs)
|
| 3447 |
{
|
| 3448 |
Coroutine *co; |
| 3449 |
RwCo rwco = {
|
| 3450 |
.bs = bs, |
| 3451 |
.ret = NOT_DONE, |
| 3452 |
}; |
| 3453 |
|
| 3454 |
if (qemu_in_coroutine()) {
|
| 3455 |
/* Fast-path if already in coroutine context */
|
| 3456 |
bdrv_flush_co_entry(&rwco); |
| 3457 |
} else {
|
| 3458 |
co = qemu_coroutine_create(bdrv_flush_co_entry); |
| 3459 |
qemu_coroutine_enter(co, &rwco); |
| 3460 |
while (rwco.ret == NOT_DONE) {
|
| 3461 |
qemu_aio_wait(); |
| 3462 |
} |
| 3463 |
} |
| 3464 |
|
| 3465 |
return rwco.ret;
|
| 3466 |
} |
| 3467 |
|
| 3468 |
static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
| 3469 |
{
|
| 3470 |
RwCo *rwco = opaque; |
| 3471 |
|
| 3472 |
rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); |
| 3473 |
} |
| 3474 |
|
| 3475 |
int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num,
|
| 3476 |
int nb_sectors)
|
| 3477 |
{
|
| 3478 |
if (!bs->drv) {
|
| 3479 |
return -ENOMEDIUM;
|
| 3480 |
} else if (bdrv_check_request(bs, sector_num, nb_sectors)) { |
| 3481 |
return -EIO;
|
| 3482 |
} else if (bs->read_only) { |
| 3483 |
return -EROFS;
|
| 3484 |
} else if (bs->drv->bdrv_co_discard) { |
| 3485 |
return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors);
|
| 3486 |
} else if (bs->drv->bdrv_aio_discard) { |
| 3487 |
BlockDriverAIOCB *acb; |
| 3488 |
CoroutineIOCompletion co = {
|
| 3489 |
.coroutine = qemu_coroutine_self(), |
| 3490 |
}; |
| 3491 |
|
| 3492 |
acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, |
| 3493 |
bdrv_co_io_em_complete, &co); |
| 3494 |
if (acb == NULL) { |
| 3495 |
return -EIO;
|
| 3496 |
} else {
|
| 3497 |
qemu_coroutine_yield(); |
| 3498 |
return co.ret;
|
| 3499 |
} |
| 3500 |
} else {
|
| 3501 |
return 0; |
| 3502 |
} |
| 3503 |
} |
| 3504 |
|
| 3505 |
int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) |
| 3506 |
{
|
| 3507 |
Coroutine *co; |
| 3508 |
RwCo rwco = {
|
| 3509 |
.bs = bs, |
| 3510 |
.sector_num = sector_num, |
| 3511 |
.nb_sectors = nb_sectors, |
| 3512 |
.ret = NOT_DONE, |
| 3513 |
}; |
| 3514 |
|
| 3515 |
if (qemu_in_coroutine()) {
|
| 3516 |
/* Fast-path if already in coroutine context */
|
| 3517 |
bdrv_discard_co_entry(&rwco); |
| 3518 |
} else {
|
| 3519 |
co = qemu_coroutine_create(bdrv_discard_co_entry); |
| 3520 |
qemu_coroutine_enter(co, &rwco); |
| 3521 |
while (rwco.ret == NOT_DONE) {
|
| 3522 |
qemu_aio_wait(); |
| 3523 |
} |
| 3524 |
} |
| 3525 |
|
| 3526 |
return rwco.ret;
|
| 3527 |
} |
| 3528 |
|
| 3529 |
/**************************************************************/
|
| 3530 |
/* removable device support */
|
| 3531 |
|
| 3532 |
/**
|
| 3533 |
* Return TRUE if the media is present
|
| 3534 |
*/
|
| 3535 |
int bdrv_is_inserted(BlockDriverState *bs)
|
| 3536 |
{
|
| 3537 |
BlockDriver *drv = bs->drv; |
| 3538 |
|
| 3539 |
if (!drv)
|
| 3540 |
return 0; |
| 3541 |
if (!drv->bdrv_is_inserted)
|
| 3542 |
return 1; |
| 3543 |
return drv->bdrv_is_inserted(bs);
|
| 3544 |
} |
| 3545 |
|
| 3546 |
/**
|
| 3547 |
* Return whether the media changed since the last call to this
|
| 3548 |
* function, or -ENOTSUP if we don't know. Most drivers don't know.
|
| 3549 |
*/
|
| 3550 |
int bdrv_media_changed(BlockDriverState *bs)
|
| 3551 |
{
|
| 3552 |
BlockDriver *drv = bs->drv; |
| 3553 |
|
| 3554 |
if (drv && drv->bdrv_media_changed) {
|
| 3555 |
return drv->bdrv_media_changed(bs);
|
| 3556 |
} |
| 3557 |
return -ENOTSUP;
|
| 3558 |
} |
| 3559 |
|
| 3560 |
/**
|
| 3561 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
| 3562 |
*/
|
| 3563 |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
| 3564 |
{
|
| 3565 |
BlockDriver *drv = bs->drv; |
| 3566 |
|
| 3567 |
if (drv && drv->bdrv_eject) {
|
| 3568 |
drv->bdrv_eject(bs, eject_flag); |
| 3569 |
} |
| 3570 |
} |
| 3571 |
|
| 3572 |
/**
|
| 3573 |
* Lock or unlock the media (if it is locked, the user won't be able
|
| 3574 |
* to eject it manually).
|
| 3575 |
*/
|
| 3576 |
void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
| 3577 |
{
|
| 3578 |
BlockDriver *drv = bs->drv; |
| 3579 |
|
| 3580 |
trace_bdrv_lock_medium(bs, locked); |
| 3581 |
|
| 3582 |
if (drv && drv->bdrv_lock_medium) {
|
| 3583 |
drv->bdrv_lock_medium(bs, locked); |
| 3584 |
} |
| 3585 |
} |
| 3586 |
|
| 3587 |
/* needed for generic scsi interface */
|
| 3588 |
|
| 3589 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| 3590 |
{
|
| 3591 |
BlockDriver *drv = bs->drv; |
| 3592 |
|
| 3593 |
if (drv && drv->bdrv_ioctl)
|
| 3594 |
return drv->bdrv_ioctl(bs, req, buf);
|
| 3595 |
return -ENOTSUP;
|
| 3596 |
} |
| 3597 |
|
| 3598 |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
| 3599 |
unsigned long int req, void *buf, |
| 3600 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 3601 |
{
|
| 3602 |
BlockDriver *drv = bs->drv; |
| 3603 |
|
| 3604 |
if (drv && drv->bdrv_aio_ioctl)
|
| 3605 |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
| 3606 |
return NULL; |
| 3607 |
} |
| 3608 |
|
| 3609 |
void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
| 3610 |
{
|
| 3611 |
bs->buffer_alignment = align; |
| 3612 |
} |
| 3613 |
|
| 3614 |
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
| 3615 |
{
|
| 3616 |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
| 3617 |
} |
| 3618 |
|
| 3619 |
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
| 3620 |
{
|
| 3621 |
int64_t bitmap_size; |
| 3622 |
|
| 3623 |
bs->dirty_count = 0;
|
| 3624 |
if (enable) {
|
| 3625 |
if (!bs->dirty_bitmap) {
|
| 3626 |
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
| 3627 |
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
| 3628 |
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
|
| 3629 |
|
| 3630 |
bs->dirty_bitmap = g_malloc0(bitmap_size); |
| 3631 |
} |
| 3632 |
} else {
|
| 3633 |
if (bs->dirty_bitmap) {
|
| 3634 |
g_free(bs->dirty_bitmap); |
| 3635 |
bs->dirty_bitmap = NULL;
|
| 3636 |
} |
| 3637 |
} |
| 3638 |
} |
| 3639 |
|
| 3640 |
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
|
| 3641 |
{
|
| 3642 |
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
| 3643 |
|
| 3644 |
if (bs->dirty_bitmap &&
|
| 3645 |
(sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
|
| 3646 |
return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
| 3647 |
(1UL << (chunk % (sizeof(unsigned long) * 8)))); |
| 3648 |
} else {
|
| 3649 |
return 0; |
| 3650 |
} |
| 3651 |
} |
| 3652 |
|
| 3653 |
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
|
| 3654 |
int nr_sectors)
|
| 3655 |
{
|
| 3656 |
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
|
| 3657 |
} |
| 3658 |
|
| 3659 |
int64_t bdrv_get_dirty_count(BlockDriverState *bs) |
| 3660 |
{
|
| 3661 |
return bs->dirty_count;
|
| 3662 |
} |
| 3663 |
|
| 3664 |
void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
| 3665 |
{
|
| 3666 |
assert(bs->in_use != in_use); |
| 3667 |
bs->in_use = in_use; |
| 3668 |
} |
| 3669 |
|
| 3670 |
int bdrv_in_use(BlockDriverState *bs)
|
| 3671 |
{
|
| 3672 |
return bs->in_use;
|
| 3673 |
} |
| 3674 |
|
| 3675 |
void bdrv_iostatus_enable(BlockDriverState *bs)
|
| 3676 |
{
|
| 3677 |
bs->iostatus_enabled = true;
|
| 3678 |
bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
| 3679 |
} |
| 3680 |
|
| 3681 |
/* The I/O status is only enabled if the drive explicitly
|
| 3682 |
* enables it _and_ the VM is configured to stop on errors */
|
| 3683 |
bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) |
| 3684 |
{
|
| 3685 |
return (bs->iostatus_enabled &&
|
| 3686 |
(bs->on_write_error == BLOCK_ERR_STOP_ENOSPC || |
| 3687 |
bs->on_write_error == BLOCK_ERR_STOP_ANY || |
| 3688 |
bs->on_read_error == BLOCK_ERR_STOP_ANY)); |
| 3689 |
} |
| 3690 |
|
| 3691 |
void bdrv_iostatus_disable(BlockDriverState *bs)
|
| 3692 |
{
|
| 3693 |
bs->iostatus_enabled = false;
|
| 3694 |
} |
| 3695 |
|
| 3696 |
void bdrv_iostatus_reset(BlockDriverState *bs)
|
| 3697 |
{
|
| 3698 |
if (bdrv_iostatus_is_enabled(bs)) {
|
| 3699 |
bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
| 3700 |
} |
| 3701 |
} |
| 3702 |
|
| 3703 |
/* XXX: Today this is set by device models because it makes the implementation
|
| 3704 |
quite simple. However, the block layer knows about the error, so it's
|
| 3705 |
possible to implement this without device models being involved */
|
| 3706 |
void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
| 3707 |
{
|
| 3708 |
if (bdrv_iostatus_is_enabled(bs) &&
|
| 3709 |
bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
|
| 3710 |
assert(error >= 0);
|
| 3711 |
bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
| 3712 |
BLOCK_DEVICE_IO_STATUS_FAILED; |
| 3713 |
} |
| 3714 |
} |
| 3715 |
|
| 3716 |
void
|
| 3717 |
bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, |
| 3718 |
enum BlockAcctType type)
|
| 3719 |
{
|
| 3720 |
assert(type < BDRV_MAX_IOTYPE); |
| 3721 |
|
| 3722 |
cookie->bytes = bytes; |
| 3723 |
cookie->start_time_ns = get_clock(); |
| 3724 |
cookie->type = type; |
| 3725 |
} |
| 3726 |
|
| 3727 |
void
|
| 3728 |
bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) |
| 3729 |
{
|
| 3730 |
assert(cookie->type < BDRV_MAX_IOTYPE); |
| 3731 |
|
| 3732 |
bs->nr_bytes[cookie->type] += cookie->bytes; |
| 3733 |
bs->nr_ops[cookie->type]++; |
| 3734 |
bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
| 3735 |
} |
| 3736 |
|
| 3737 |
int bdrv_img_create(const char *filename, const char *fmt, |
| 3738 |
const char *base_filename, const char *base_fmt, |
| 3739 |
char *options, uint64_t img_size, int flags) |
| 3740 |
{
|
| 3741 |
QEMUOptionParameter *param = NULL, *create_options = NULL; |
| 3742 |
QEMUOptionParameter *backing_fmt, *backing_file, *size; |
| 3743 |
BlockDriverState *bs = NULL;
|
| 3744 |
BlockDriver *drv, *proto_drv; |
| 3745 |
BlockDriver *backing_drv = NULL;
|
| 3746 |
int ret = 0; |
| 3747 |
|
| 3748 |
/* Find driver and parse its options */
|
| 3749 |
drv = bdrv_find_format(fmt); |
| 3750 |
if (!drv) {
|
| 3751 |
error_report("Unknown file format '%s'", fmt);
|
| 3752 |
ret = -EINVAL; |
| 3753 |
goto out;
|
| 3754 |
} |
| 3755 |
|
| 3756 |
proto_drv = bdrv_find_protocol(filename); |
| 3757 |
if (!proto_drv) {
|
| 3758 |
error_report("Unknown protocol '%s'", filename);
|
| 3759 |
ret = -EINVAL; |
| 3760 |
goto out;
|
| 3761 |
} |
| 3762 |
|
| 3763 |
create_options = append_option_parameters(create_options, |
| 3764 |
drv->create_options); |
| 3765 |
create_options = append_option_parameters(create_options, |
| 3766 |
proto_drv->create_options); |
| 3767 |
|
| 3768 |
/* Create parameter list with default values */
|
| 3769 |
param = parse_option_parameters("", create_options, param);
|
| 3770 |
|
| 3771 |
set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); |
| 3772 |
|
| 3773 |
/* Parse -o options */
|
| 3774 |
if (options) {
|
| 3775 |
param = parse_option_parameters(options, create_options, param); |
| 3776 |
if (param == NULL) { |
| 3777 |
error_report("Invalid options for file format '%s'.", fmt);
|
| 3778 |
ret = -EINVAL; |
| 3779 |
goto out;
|
| 3780 |
} |
| 3781 |
} |
| 3782 |
|
| 3783 |
if (base_filename) {
|
| 3784 |
if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE,
|
| 3785 |
base_filename)) {
|
| 3786 |
error_report("Backing file not supported for file format '%s'",
|
| 3787 |
fmt); |
| 3788 |
ret = -EINVAL; |
| 3789 |
goto out;
|
| 3790 |
} |
| 3791 |
} |
| 3792 |
|
| 3793 |
if (base_fmt) {
|
| 3794 |
if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) {
|
| 3795 |
error_report("Backing file format not supported for file "
|
| 3796 |
"format '%s'", fmt);
|
| 3797 |
ret = -EINVAL; |
| 3798 |
goto out;
|
| 3799 |
} |
| 3800 |
} |
| 3801 |
|
| 3802 |
backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
| 3803 |
if (backing_file && backing_file->value.s) {
|
| 3804 |
if (!strcmp(filename, backing_file->value.s)) {
|
| 3805 |
error_report("Error: Trying to create an image with the "
|
| 3806 |
"same filename as the backing file");
|
| 3807 |
ret = -EINVAL; |
| 3808 |
goto out;
|
| 3809 |
} |
| 3810 |
} |
| 3811 |
|
| 3812 |
backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
| 3813 |
if (backing_fmt && backing_fmt->value.s) {
|
| 3814 |
backing_drv = bdrv_find_format(backing_fmt->value.s); |
| 3815 |
if (!backing_drv) {
|
| 3816 |
error_report("Unknown backing file format '%s'",
|
| 3817 |
backing_fmt->value.s); |
| 3818 |
ret = -EINVAL; |
| 3819 |
goto out;
|
| 3820 |
} |
| 3821 |
} |
| 3822 |
|
| 3823 |
// The size for the image must always be specified, with one exception:
|
| 3824 |
// If we are using a backing file, we can obtain the size from there
|
| 3825 |
size = get_option_parameter(param, BLOCK_OPT_SIZE); |
| 3826 |
if (size && size->value.n == -1) { |
| 3827 |
if (backing_file && backing_file->value.s) {
|
| 3828 |
uint64_t size; |
| 3829 |
char buf[32]; |
| 3830 |
|
| 3831 |
bs = bdrv_new("");
|
| 3832 |
|
| 3833 |
ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv); |
| 3834 |
if (ret < 0) { |
| 3835 |
error_report("Could not open '%s'", backing_file->value.s);
|
| 3836 |
goto out;
|
| 3837 |
} |
| 3838 |
bdrv_get_geometry(bs, &size); |
| 3839 |
size *= 512;
|
| 3840 |
|
| 3841 |
snprintf(buf, sizeof(buf), "%" PRId64, size); |
| 3842 |
set_option_parameter(param, BLOCK_OPT_SIZE, buf); |
| 3843 |
} else {
|
| 3844 |
error_report("Image creation needs a size parameter");
|
| 3845 |
ret = -EINVAL; |
| 3846 |
goto out;
|
| 3847 |
} |
| 3848 |
} |
| 3849 |
|
| 3850 |
printf("Formatting '%s', fmt=%s ", filename, fmt);
|
| 3851 |
print_option_parameters(param); |
| 3852 |
puts("");
|
| 3853 |
|
| 3854 |
ret = bdrv_create(drv, filename, param); |
| 3855 |
|
| 3856 |
if (ret < 0) { |
| 3857 |
if (ret == -ENOTSUP) {
|
| 3858 |
error_report("Formatting or formatting option not supported for "
|
| 3859 |
"file format '%s'", fmt);
|
| 3860 |
} else if (ret == -EFBIG) { |
| 3861 |
error_report("The image size is too large for file format '%s'",
|
| 3862 |
fmt); |
| 3863 |
} else {
|
| 3864 |
error_report("%s: error while creating %s: %s", filename, fmt,
|
| 3865 |
strerror(-ret)); |
| 3866 |
} |
| 3867 |
} |
| 3868 |
|
| 3869 |
out:
|
| 3870 |
free_option_parameters(create_options); |
| 3871 |
free_option_parameters(param); |
| 3872 |
|
| 3873 |
if (bs) {
|
| 3874 |
bdrv_delete(bs); |
| 3875 |
} |
| 3876 |
|
| 3877 |
return ret;
|
| 3878 |
} |
| 3879 |
|
| 3880 |
void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs, |
| 3881 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 3882 |
{
|
| 3883 |
BlockJob *job; |
| 3884 |
|
| 3885 |
if (bs->job || bdrv_in_use(bs)) {
|
| 3886 |
return NULL; |
| 3887 |
} |
| 3888 |
bdrv_set_in_use(bs, 1);
|
| 3889 |
|
| 3890 |
job = g_malloc0(job_type->instance_size); |
| 3891 |
job->job_type = job_type; |
| 3892 |
job->bs = bs; |
| 3893 |
job->cb = cb; |
| 3894 |
job->opaque = opaque; |
| 3895 |
bs->job = job; |
| 3896 |
return job;
|
| 3897 |
} |
| 3898 |
|
| 3899 |
void block_job_complete(BlockJob *job, int ret) |
| 3900 |
{
|
| 3901 |
BlockDriverState *bs = job->bs; |
| 3902 |
|
| 3903 |
assert(bs->job == job); |
| 3904 |
job->cb(job->opaque, ret); |
| 3905 |
bs->job = NULL;
|
| 3906 |
g_free(job); |
| 3907 |
bdrv_set_in_use(bs, 0);
|
| 3908 |
} |
| 3909 |
|
| 3910 |
int block_job_set_speed(BlockJob *job, int64_t value)
|
| 3911 |
{
|
| 3912 |
if (!job->job_type->set_speed) {
|
| 3913 |
return -ENOTSUP;
|
| 3914 |
} |
| 3915 |
return job->job_type->set_speed(job, value);
|
| 3916 |
} |
| 3917 |
|
| 3918 |
void block_job_cancel(BlockJob *job)
|
| 3919 |
{
|
| 3920 |
job->cancelled = true;
|
| 3921 |
} |
| 3922 |
|
| 3923 |
bool block_job_is_cancelled(BlockJob *job)
|
| 3924 |
{
|
| 3925 |
return job->cancelled;
|
| 3926 |
} |