mirror of https://gitee.com/openkylin/qemu.git
4442 lines
121 KiB
C
4442 lines
121 KiB
C
/*
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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 "blockjob.h"
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#include "module.h"
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#include "qjson.h"
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#include "sysemu.h"
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#include "qemu-coroutine.h"
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#include "qmp-commands.h"
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#include "qemu-timer.h"
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#ifdef CONFIG_BSD
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/queue.h>
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#ifndef __DragonFly__
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#include <sys/disk.h>
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#endif
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */
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typedef enum {
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BDRV_REQ_COPY_ON_READ = 0x1,
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BDRV_REQ_ZERO_WRITE = 0x2,
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} BdrvRequestFlags;
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static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load);
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static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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static 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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BdrvRequestFlags flags);
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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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static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors);
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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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static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
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QTAILQ_HEAD_INITIALIZER(bdrv_states);
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static QLIST_HEAD(, BlockDriver) bdrv_drivers =
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QLIST_HEAD_INITIALIZER(bdrv_drivers);
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/* The device to use for VM snapshots */
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static BlockDriverState *bs_snapshots;
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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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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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/* 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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while (qemu_co_queue_next(&bs->throttled_reqs));
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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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static void bdrv_block_timer(void *opaque)
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{
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BlockDriverState *bs = opaque;
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qemu_co_queue_next(&bs->throttled_reqs);
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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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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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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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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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/* 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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const char *p;
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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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p = path + strcspn(path, ":/\\");
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#else
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p = path + strcspn(path, ":/");
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#endif
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return *p == ':';
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}
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int path_is_absolute(const char *path)
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{
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#ifdef _WIN32
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/* specific case for names like: "\\.\d:" */
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if (is_windows_drive(path) || is_windows_drive_prefix(path)) {
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return 1;
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}
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return (*path == '/' || *path == '\\');
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#else
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return (*path == '/');
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#endif
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}
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/* if filename is absolute, just copy it to dest. Otherwise, build a
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path to it by considering it is relative to base_path. URL are
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supported. */
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void path_combine(char *dest, int dest_size,
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const char *base_path,
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const char *filename)
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{
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const char *p, *p1;
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int len;
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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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void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz)
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{
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if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) {
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pstrcpy(dest, sz, bs->backing_file);
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} else {
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path_combine(dest, sz, bs->filename, bs->backing_file);
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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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/* 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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QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list);
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}
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/* create a new block device (by default it is empty) */
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BlockDriverState *bdrv_new(const char *device_name)
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{
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BlockDriverState *bs;
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bs = 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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}
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BlockDriver *bdrv_find_format(const char *format_name)
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{
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BlockDriver *drv1;
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QLIST_FOREACH(drv1, &bdrv_drivers, list) {
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if (!strcmp(drv1->format_name, format_name)) {
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return drv1;
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}
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}
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return NULL;
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}
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static int bdrv_is_whitelisted(BlockDriver *drv)
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{
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static const char *whitelist[] = {
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CONFIG_BDRV_WHITELIST
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};
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const char **p;
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if (!whitelist[0])
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return 1; /* no whitelist, anything goes */
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for (p = whitelist; *p; p++) {
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if (!strcmp(drv->format_name, *p)) {
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return 1;
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}
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}
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return 0;
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}
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BlockDriver *bdrv_find_whitelisted_format(const char *format_name)
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{
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BlockDriver *drv = bdrv_find_format(format_name);
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return drv && bdrv_is_whitelisted(drv) ? drv : NULL;
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}
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typedef struct CreateCo {
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BlockDriver *drv;
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char *filename;
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QEMUOptionParameter *options;
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int ret;
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} CreateCo;
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static void coroutine_fn bdrv_create_co_entry(void *opaque)
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{
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CreateCo *cco = opaque;
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assert(cco->drv);
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cco->ret = cco->drv->bdrv_create(cco->filename, cco->options);
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}
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int bdrv_create(BlockDriver *drv, const char* filename,
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QEMUOptionParameter *options)
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{
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int ret;
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Coroutine *co;
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CreateCo cco = {
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.drv = drv,
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.filename = g_strdup(filename),
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.options = options,
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.ret = NOT_DONE,
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};
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if (!drv->bdrv_create) {
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return -ENOTSUP;
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}
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if (qemu_in_coroutine()) {
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/* Fast-path if already in coroutine context */
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bdrv_create_co_entry(&cco);
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} else {
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co = qemu_coroutine_create(bdrv_create_co_entry);
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qemu_coroutine_enter(co, &cco);
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while (cco.ret == NOT_DONE) {
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qemu_aio_wait();
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}
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}
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ret = cco.ret;
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g_free(cco.filename);
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return ret;
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}
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int bdrv_create_file(const char* filename, QEMUOptionParameter *options)
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{
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BlockDriver *drv;
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drv = bdrv_find_protocol(filename);
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if (drv == NULL) {
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return -ENOENT;
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}
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return bdrv_create(drv, filename, options);
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}
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/*
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* Create a uniquely-named empty temporary file.
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* Return 0 upon success, otherwise a negative errno value.
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*/
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int get_tmp_filename(char *filename, int size)
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{
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#ifdef _WIN32
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char temp_dir[MAX_PATH];
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/* GetTempFileName requires that its output buffer (4th param)
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have length MAX_PATH or greater. */
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assert(size >= MAX_PATH);
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return (GetTempPath(MAX_PATH, temp_dir)
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&& GetTempFileName(temp_dir, "qem", 0, filename)
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? 0 : -GetLastError());
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#else
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int fd;
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const char *tmpdir;
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tmpdir = getenv("TMPDIR");
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if (!tmpdir)
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tmpdir = "/tmp";
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if (snprintf(filename, size, "%s/vl.XXXXXX", tmpdir) >= size) {
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return -EOVERFLOW;
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}
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fd = mkstemp(filename);
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if (fd < 0) {
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return -errno;
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}
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if (close(fd) != 0) {
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unlink(filename);
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return -errno;
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}
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return 0;
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#endif
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}
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/*
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* Detect host devices. By convention, /dev/cdrom[N] is always
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* recognized as a host CDROM.
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*/
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static BlockDriver *find_hdev_driver(const char *filename)
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{
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int score_max = 0, score;
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BlockDriver *drv = NULL, *d;
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QLIST_FOREACH(d, &bdrv_drivers, list) {
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if (d->bdrv_probe_device) {
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score = d->bdrv_probe_device(filename);
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if (score > score_max) {
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score_max = score;
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drv = d;
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}
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}
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}
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return drv;
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}
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BlockDriver *bdrv_find_protocol(const char *filename)
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{
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BlockDriver *drv1;
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char protocol[128];
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int len;
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const char *p;
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/* TODO Drivers without bdrv_file_open must be specified explicitly */
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/*
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* XXX(hch): we really should not let host device detection
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* override an explicit protocol specification, but moving this
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* later breaks access to device names with colons in them.
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* Thanks to the brain-dead persistent naming schemes on udev-
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* based Linux systems those actually are quite common.
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*/
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drv1 = find_hdev_driver(filename);
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if (drv1) {
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return drv1;
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}
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if (!path_has_protocol(filename)) {
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return bdrv_find_format("file");
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}
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p = strchr(filename, ':');
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assert(p != NULL);
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len = p - filename;
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if (len > sizeof(protocol) - 1)
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len = sizeof(protocol) - 1;
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memcpy(protocol, filename, len);
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protocol[len] = '\0';
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QLIST_FOREACH(drv1, &bdrv_drivers, list) {
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if (drv1->protocol_name &&
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!strcmp(drv1->protocol_name, protocol)) {
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return drv1;
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}
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}
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return NULL;
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}
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|
static int find_image_format(const char *filename, BlockDriver **pdrv)
|
|
{
|
|
int ret, score, score_max;
|
|
BlockDriver *drv1, *drv;
|
|
uint8_t buf[2048];
|
|
BlockDriverState *bs;
|
|
|
|
ret = bdrv_file_open(&bs, filename, 0);
|
|
if (ret < 0) {
|
|
*pdrv = NULL;
|
|
return ret;
|
|
}
|
|
|
|
/* Return the raw BlockDriver * to scsi-generic devices or empty drives */
|
|
if (bs->sg || !bdrv_is_inserted(bs)) {
|
|
bdrv_delete(bs);
|
|
drv = bdrv_find_format("raw");
|
|
if (!drv) {
|
|
ret = -ENOENT;
|
|
}
|
|
*pdrv = drv;
|
|
return ret;
|
|
}
|
|
|
|
ret = bdrv_pread(bs, 0, buf, sizeof(buf));
|
|
bdrv_delete(bs);
|
|
if (ret < 0) {
|
|
*pdrv = NULL;
|
|
return ret;
|
|
}
|
|
|
|
score_max = 0;
|
|
drv = NULL;
|
|
QLIST_FOREACH(drv1, &bdrv_drivers, list) {
|
|
if (drv1->bdrv_probe) {
|
|
score = drv1->bdrv_probe(buf, ret, filename);
|
|
if (score > score_max) {
|
|
score_max = score;
|
|
drv = drv1;
|
|
}
|
|
}
|
|
}
|
|
if (!drv) {
|
|
ret = -ENOENT;
|
|
}
|
|
*pdrv = drv;
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Set the current 'total_sectors' value
|
|
*/
|
|
static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
/* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
|
|
if (bs->sg)
|
|
return 0;
|
|
|
|
/* query actual device if possible, otherwise just trust the hint */
|
|
if (drv->bdrv_getlength) {
|
|
int64_t length = drv->bdrv_getlength(bs);
|
|
if (length < 0) {
|
|
return length;
|
|
}
|
|
hint = length >> BDRV_SECTOR_BITS;
|
|
}
|
|
|
|
bs->total_sectors = hint;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Set open flags for a given cache mode
|
|
*
|
|
* Return 0 on success, -1 if the cache mode was invalid.
|
|
*/
|
|
int bdrv_parse_cache_flags(const char *mode, int *flags)
|
|
{
|
|
*flags &= ~BDRV_O_CACHE_MASK;
|
|
|
|
if (!strcmp(mode, "off") || !strcmp(mode, "none")) {
|
|
*flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
|
|
} else if (!strcmp(mode, "directsync")) {
|
|
*flags |= BDRV_O_NOCACHE;
|
|
} else if (!strcmp(mode, "writeback")) {
|
|
*flags |= BDRV_O_CACHE_WB;
|
|
} else if (!strcmp(mode, "unsafe")) {
|
|
*flags |= BDRV_O_CACHE_WB;
|
|
*flags |= BDRV_O_NO_FLUSH;
|
|
} else if (!strcmp(mode, "writethrough")) {
|
|
/* this is the default */
|
|
} else {
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* The copy-on-read flag is actually a reference count so multiple users may
|
|
* use the feature without worrying about clobbering its previous state.
|
|
* Copy-on-read stays enabled until all users have called to disable it.
|
|
*/
|
|
void bdrv_enable_copy_on_read(BlockDriverState *bs)
|
|
{
|
|
bs->copy_on_read++;
|
|
}
|
|
|
|
void bdrv_disable_copy_on_read(BlockDriverState *bs)
|
|
{
|
|
assert(bs->copy_on_read > 0);
|
|
bs->copy_on_read--;
|
|
}
|
|
|
|
/*
|
|
* Common part for opening disk images and files
|
|
*/
|
|
static int bdrv_open_common(BlockDriverState *bs, const char *filename,
|
|
int flags, BlockDriver *drv)
|
|
{
|
|
int ret, open_flags;
|
|
|
|
assert(drv != NULL);
|
|
assert(bs->file == NULL);
|
|
|
|
trace_bdrv_open_common(bs, filename, flags, drv->format_name);
|
|
|
|
bs->open_flags = flags;
|
|
bs->buffer_alignment = 512;
|
|
|
|
assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */
|
|
if ((flags & BDRV_O_RDWR) && (flags & BDRV_O_COPY_ON_READ)) {
|
|
bdrv_enable_copy_on_read(bs);
|
|
}
|
|
|
|
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
|
|
|
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
bs->drv = drv;
|
|
bs->opaque = g_malloc0(drv->instance_size);
|
|
|
|
bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB);
|
|
open_flags = flags | BDRV_O_CACHE_WB;
|
|
|
|
/*
|
|
* Clear flags that are internal to the block layer before opening the
|
|
* image.
|
|
*/
|
|
open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
|
|
|
|
/*
|
|
* Snapshots should be writable.
|
|
*/
|
|
if (bs->is_temporary) {
|
|
open_flags |= BDRV_O_RDWR;
|
|
}
|
|
|
|
bs->read_only = !(open_flags & BDRV_O_RDWR);
|
|
|
|
/* Open the image, either directly or using a protocol */
|
|
if (drv->bdrv_file_open) {
|
|
ret = drv->bdrv_file_open(bs, filename, open_flags);
|
|
} else {
|
|
ret = bdrv_file_open(&bs->file, filename, open_flags);
|
|
if (ret >= 0) {
|
|
ret = drv->bdrv_open(bs, open_flags);
|
|
}
|
|
}
|
|
|
|
if (ret < 0) {
|
|
goto free_and_fail;
|
|
}
|
|
|
|
ret = refresh_total_sectors(bs, bs->total_sectors);
|
|
if (ret < 0) {
|
|
goto free_and_fail;
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
if (bs->is_temporary) {
|
|
unlink(filename);
|
|
}
|
|
#endif
|
|
return 0;
|
|
|
|
free_and_fail:
|
|
if (bs->file) {
|
|
bdrv_delete(bs->file);
|
|
bs->file = NULL;
|
|
}
|
|
g_free(bs->opaque);
|
|
bs->opaque = NULL;
|
|
bs->drv = NULL;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Opens a file using a protocol (file, host_device, nbd, ...)
|
|
*/
|
|
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
|
|
{
|
|
BlockDriverState *bs;
|
|
BlockDriver *drv;
|
|
int ret;
|
|
|
|
drv = bdrv_find_protocol(filename);
|
|
if (!drv) {
|
|
return -ENOENT;
|
|
}
|
|
|
|
bs = bdrv_new("");
|
|
ret = bdrv_open_common(bs, filename, flags, drv);
|
|
if (ret < 0) {
|
|
bdrv_delete(bs);
|
|
return ret;
|
|
}
|
|
bs->growable = 1;
|
|
*pbs = bs;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Opens a disk image (raw, qcow2, vmdk, ...)
|
|
*/
|
|
int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
|
|
BlockDriver *drv)
|
|
{
|
|
int ret;
|
|
char tmp_filename[PATH_MAX];
|
|
|
|
if (flags & BDRV_O_SNAPSHOT) {
|
|
BlockDriverState *bs1;
|
|
int64_t total_size;
|
|
int is_protocol = 0;
|
|
BlockDriver *bdrv_qcow2;
|
|
QEMUOptionParameter *options;
|
|
char backing_filename[PATH_MAX];
|
|
|
|
/* if snapshot, we create a temporary backing file and open it
|
|
instead of opening 'filename' directly */
|
|
|
|
/* if there is a backing file, use it */
|
|
bs1 = bdrv_new("");
|
|
ret = bdrv_open(bs1, filename, 0, drv);
|
|
if (ret < 0) {
|
|
bdrv_delete(bs1);
|
|
return ret;
|
|
}
|
|
total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
|
|
|
|
if (bs1->drv && bs1->drv->protocol_name)
|
|
is_protocol = 1;
|
|
|
|
bdrv_delete(bs1);
|
|
|
|
ret = get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
/* Real path is meaningless for protocols */
|
|
if (is_protocol)
|
|
snprintf(backing_filename, sizeof(backing_filename),
|
|
"%s", filename);
|
|
else if (!realpath(filename, backing_filename))
|
|
return -errno;
|
|
|
|
bdrv_qcow2 = bdrv_find_format("qcow2");
|
|
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
|
|
|
|
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size);
|
|
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
|
|
if (drv) {
|
|
set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
|
|
drv->format_name);
|
|
}
|
|
|
|
ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
|
|
free_option_parameters(options);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
filename = tmp_filename;
|
|
drv = bdrv_qcow2;
|
|
bs->is_temporary = 1;
|
|
}
|
|
|
|
/* Find the right image format driver */
|
|
if (!drv) {
|
|
ret = find_image_format(filename, &drv);
|
|
}
|
|
|
|
if (!drv) {
|
|
goto unlink_and_fail;
|
|
}
|
|
|
|
if (flags & BDRV_O_RDWR) {
|
|
flags |= BDRV_O_ALLOW_RDWR;
|
|
}
|
|
|
|
/* Open the image */
|
|
ret = bdrv_open_common(bs, filename, flags, drv);
|
|
if (ret < 0) {
|
|
goto unlink_and_fail;
|
|
}
|
|
|
|
/* If there is a backing file, use it */
|
|
if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
|
|
char backing_filename[PATH_MAX];
|
|
int back_flags;
|
|
BlockDriver *back_drv = NULL;
|
|
|
|
bs->backing_hd = bdrv_new("");
|
|
bdrv_get_full_backing_filename(bs, backing_filename,
|
|
sizeof(backing_filename));
|
|
|
|
if (bs->backing_format[0] != '\0') {
|
|
back_drv = bdrv_find_format(bs->backing_format);
|
|
}
|
|
|
|
/* backing files always opened read-only */
|
|
back_flags =
|
|
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
|
|
|
|
ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv);
|
|
if (ret < 0) {
|
|
bdrv_close(bs);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (!bdrv_key_required(bs)) {
|
|
bdrv_dev_change_media_cb(bs, true);
|
|
}
|
|
|
|
/* throttling disk I/O limits */
|
|
if (bs->io_limits_enabled) {
|
|
bdrv_io_limits_enable(bs);
|
|
}
|
|
|
|
return 0;
|
|
|
|
unlink_and_fail:
|
|
if (bs->is_temporary) {
|
|
unlink(filename);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
typedef struct BlockReopenQueueEntry {
|
|
bool prepared;
|
|
BDRVReopenState state;
|
|
QSIMPLEQ_ENTRY(BlockReopenQueueEntry) entry;
|
|
} BlockReopenQueueEntry;
|
|
|
|
/*
|
|
* Adds a BlockDriverState to a simple queue for an atomic, transactional
|
|
* reopen of multiple devices.
|
|
*
|
|
* bs_queue can either be an existing BlockReopenQueue that has had QSIMPLE_INIT
|
|
* already performed, or alternatively may be NULL a new BlockReopenQueue will
|
|
* be created and initialized. This newly created BlockReopenQueue should be
|
|
* passed back in for subsequent calls that are intended to be of the same
|
|
* atomic 'set'.
|
|
*
|
|
* bs is the BlockDriverState to add to the reopen queue.
|
|
*
|
|
* flags contains the open flags for the associated bs
|
|
*
|
|
* returns a pointer to bs_queue, which is either the newly allocated
|
|
* bs_queue, or the existing bs_queue being used.
|
|
*
|
|
*/
|
|
BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
|
|
BlockDriverState *bs, int flags)
|
|
{
|
|
assert(bs != NULL);
|
|
|
|
BlockReopenQueueEntry *bs_entry;
|
|
if (bs_queue == NULL) {
|
|
bs_queue = g_new0(BlockReopenQueue, 1);
|
|
QSIMPLEQ_INIT(bs_queue);
|
|
}
|
|
|
|
if (bs->file) {
|
|
bdrv_reopen_queue(bs_queue, bs->file, flags);
|
|
}
|
|
|
|
bs_entry = g_new0(BlockReopenQueueEntry, 1);
|
|
QSIMPLEQ_INSERT_TAIL(bs_queue, bs_entry, entry);
|
|
|
|
bs_entry->state.bs = bs;
|
|
bs_entry->state.flags = flags;
|
|
|
|
return bs_queue;
|
|
}
|
|
|
|
/*
|
|
* Reopen multiple BlockDriverStates atomically & transactionally.
|
|
*
|
|
* The queue passed in (bs_queue) must have been built up previous
|
|
* via bdrv_reopen_queue().
|
|
*
|
|
* Reopens all BDS specified in the queue, with the appropriate
|
|
* flags. All devices are prepared for reopen, and failure of any
|
|
* device will cause all device changes to be abandonded, and intermediate
|
|
* data cleaned up.
|
|
*
|
|
* If all devices prepare successfully, then the changes are committed
|
|
* to all devices.
|
|
*
|
|
*/
|
|
int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp)
|
|
{
|
|
int ret = -1;
|
|
BlockReopenQueueEntry *bs_entry, *next;
|
|
Error *local_err = NULL;
|
|
|
|
assert(bs_queue != NULL);
|
|
|
|
bdrv_drain_all();
|
|
|
|
QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) {
|
|
if (bdrv_reopen_prepare(&bs_entry->state, bs_queue, &local_err)) {
|
|
error_propagate(errp, local_err);
|
|
goto cleanup;
|
|
}
|
|
bs_entry->prepared = true;
|
|
}
|
|
|
|
/* If we reach this point, we have success and just need to apply the
|
|
* changes
|
|
*/
|
|
QSIMPLEQ_FOREACH(bs_entry, bs_queue, entry) {
|
|
bdrv_reopen_commit(&bs_entry->state);
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
cleanup:
|
|
QSIMPLEQ_FOREACH_SAFE(bs_entry, bs_queue, entry, next) {
|
|
if (ret && bs_entry->prepared) {
|
|
bdrv_reopen_abort(&bs_entry->state);
|
|
}
|
|
g_free(bs_entry);
|
|
}
|
|
g_free(bs_queue);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/* Reopen a single BlockDriverState with the specified flags. */
|
|
int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp)
|
|
{
|
|
int ret = -1;
|
|
Error *local_err = NULL;
|
|
BlockReopenQueue *queue = bdrv_reopen_queue(NULL, bs, bdrv_flags);
|
|
|
|
ret = bdrv_reopen_multiple(queue, &local_err);
|
|
if (local_err != NULL) {
|
|
error_propagate(errp, local_err);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* Prepares a BlockDriverState for reopen. All changes are staged in the
|
|
* 'opaque' field of the BDRVReopenState, which is used and allocated by
|
|
* the block driver layer .bdrv_reopen_prepare()
|
|
*
|
|
* bs is the BlockDriverState to reopen
|
|
* flags are the new open flags
|
|
* queue is the reopen queue
|
|
*
|
|
* Returns 0 on success, non-zero on error. On error errp will be set
|
|
* as well.
|
|
*
|
|
* On failure, bdrv_reopen_abort() will be called to clean up any data.
|
|
* It is the responsibility of the caller to then call the abort() or
|
|
* commit() for any other BDS that have been left in a prepare() state
|
|
*
|
|
*/
|
|
int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue,
|
|
Error **errp)
|
|
{
|
|
int ret = -1;
|
|
Error *local_err = NULL;
|
|
BlockDriver *drv;
|
|
|
|
assert(reopen_state != NULL);
|
|
assert(reopen_state->bs->drv != NULL);
|
|
drv = reopen_state->bs->drv;
|
|
|
|
/* if we are to stay read-only, do not allow permission change
|
|
* to r/w */
|
|
if (!(reopen_state->bs->open_flags & BDRV_O_ALLOW_RDWR) &&
|
|
reopen_state->flags & BDRV_O_RDWR) {
|
|
error_set(errp, QERR_DEVICE_IS_READ_ONLY,
|
|
reopen_state->bs->device_name);
|
|
goto error;
|
|
}
|
|
|
|
|
|
ret = bdrv_flush(reopen_state->bs);
|
|
if (ret) {
|
|
error_set(errp, ERROR_CLASS_GENERIC_ERROR, "Error (%s) flushing drive",
|
|
strerror(-ret));
|
|
goto error;
|
|
}
|
|
|
|
if (drv->bdrv_reopen_prepare) {
|
|
ret = drv->bdrv_reopen_prepare(reopen_state, queue, &local_err);
|
|
if (ret) {
|
|
if (local_err != NULL) {
|
|
error_propagate(errp, local_err);
|
|
} else {
|
|
error_set(errp, QERR_OPEN_FILE_FAILED,
|
|
reopen_state->bs->filename);
|
|
}
|
|
goto error;
|
|
}
|
|
} else {
|
|
/* It is currently mandatory to have a bdrv_reopen_prepare()
|
|
* handler for each supported drv. */
|
|
error_set(errp, QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
|
|
drv->format_name, reopen_state->bs->device_name,
|
|
"reopening of file");
|
|
ret = -1;
|
|
goto error;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
error:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Takes the staged changes for the reopen from bdrv_reopen_prepare(), and
|
|
* makes them final by swapping the staging BlockDriverState contents into
|
|
* the active BlockDriverState contents.
|
|
*/
|
|
void bdrv_reopen_commit(BDRVReopenState *reopen_state)
|
|
{
|
|
BlockDriver *drv;
|
|
|
|
assert(reopen_state != NULL);
|
|
drv = reopen_state->bs->drv;
|
|
assert(drv != NULL);
|
|
|
|
/* If there are any driver level actions to take */
|
|
if (drv->bdrv_reopen_commit) {
|
|
drv->bdrv_reopen_commit(reopen_state);
|
|
}
|
|
|
|
/* set BDS specific flags now */
|
|
reopen_state->bs->open_flags = reopen_state->flags;
|
|
reopen_state->bs->enable_write_cache = !!(reopen_state->flags &
|
|
BDRV_O_CACHE_WB);
|
|
reopen_state->bs->read_only = !(reopen_state->flags & BDRV_O_RDWR);
|
|
}
|
|
|
|
/*
|
|
* Abort the reopen, and delete and free the staged changes in
|
|
* reopen_state
|
|
*/
|
|
void bdrv_reopen_abort(BDRVReopenState *reopen_state)
|
|
{
|
|
BlockDriver *drv;
|
|
|
|
assert(reopen_state != NULL);
|
|
drv = reopen_state->bs->drv;
|
|
assert(drv != NULL);
|
|
|
|
if (drv->bdrv_reopen_abort) {
|
|
drv->bdrv_reopen_abort(reopen_state);
|
|
}
|
|
}
|
|
|
|
|
|
void bdrv_close(BlockDriverState *bs)
|
|
{
|
|
bdrv_flush(bs);
|
|
if (bs->drv) {
|
|
if (bs->job) {
|
|
block_job_cancel_sync(bs->job);
|
|
}
|
|
bdrv_drain_all();
|
|
|
|
if (bs == bs_snapshots) {
|
|
bs_snapshots = NULL;
|
|
}
|
|
if (bs->backing_hd) {
|
|
bdrv_delete(bs->backing_hd);
|
|
bs->backing_hd = NULL;
|
|
}
|
|
bs->drv->bdrv_close(bs);
|
|
g_free(bs->opaque);
|
|
#ifdef _WIN32
|
|
if (bs->is_temporary) {
|
|
unlink(bs->filename);
|
|
}
|
|
#endif
|
|
bs->opaque = NULL;
|
|
bs->drv = NULL;
|
|
bs->copy_on_read = 0;
|
|
bs->backing_file[0] = '\0';
|
|
bs->backing_format[0] = '\0';
|
|
bs->total_sectors = 0;
|
|
bs->encrypted = 0;
|
|
bs->valid_key = 0;
|
|
bs->sg = 0;
|
|
bs->growable = 0;
|
|
|
|
if (bs->file != NULL) {
|
|
bdrv_delete(bs->file);
|
|
bs->file = NULL;
|
|
}
|
|
}
|
|
|
|
bdrv_dev_change_media_cb(bs, false);
|
|
|
|
/*throttling disk I/O limits*/
|
|
if (bs->io_limits_enabled) {
|
|
bdrv_io_limits_disable(bs);
|
|
}
|
|
}
|
|
|
|
void bdrv_close_all(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
bdrv_close(bs);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Wait for pending requests to complete across all BlockDriverStates
|
|
*
|
|
* This function does not flush data to disk, use bdrv_flush_all() for that
|
|
* after calling this function.
|
|
*
|
|
* Note that completion of an asynchronous I/O operation can trigger any
|
|
* number of other I/O operations on other devices---for example a coroutine
|
|
* can be arbitrarily complex and a constant flow of I/O can come until the
|
|
* coroutine is complete. Because of this, it is not possible to have a
|
|
* function to drain a single device's I/O queue.
|
|
*/
|
|
void bdrv_drain_all(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
bool busy;
|
|
|
|
do {
|
|
busy = qemu_aio_wait();
|
|
|
|
/* FIXME: We do not have timer support here, so this is effectively
|
|
* a busy wait.
|
|
*/
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
if (!qemu_co_queue_empty(&bs->throttled_reqs)) {
|
|
qemu_co_queue_restart_all(&bs->throttled_reqs);
|
|
busy = true;
|
|
}
|
|
}
|
|
} while (busy);
|
|
|
|
/* If requests are still pending there is a bug somewhere */
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
assert(QLIST_EMPTY(&bs->tracked_requests));
|
|
assert(qemu_co_queue_empty(&bs->throttled_reqs));
|
|
}
|
|
}
|
|
|
|
/* make a BlockDriverState anonymous by removing from bdrv_state list.
|
|
Also, NULL terminate the device_name to prevent double remove */
|
|
void bdrv_make_anon(BlockDriverState *bs)
|
|
{
|
|
if (bs->device_name[0] != '\0') {
|
|
QTAILQ_REMOVE(&bdrv_states, bs, list);
|
|
}
|
|
bs->device_name[0] = '\0';
|
|
}
|
|
|
|
static void bdrv_rebind(BlockDriverState *bs)
|
|
{
|
|
if (bs->drv && bs->drv->bdrv_rebind) {
|
|
bs->drv->bdrv_rebind(bs);
|
|
}
|
|
}
|
|
|
|
static void bdrv_move_feature_fields(BlockDriverState *bs_dest,
|
|
BlockDriverState *bs_src)
|
|
{
|
|
/* move some fields that need to stay attached to the device */
|
|
bs_dest->open_flags = bs_src->open_flags;
|
|
|
|
/* dev info */
|
|
bs_dest->dev_ops = bs_src->dev_ops;
|
|
bs_dest->dev_opaque = bs_src->dev_opaque;
|
|
bs_dest->dev = bs_src->dev;
|
|
bs_dest->buffer_alignment = bs_src->buffer_alignment;
|
|
bs_dest->copy_on_read = bs_src->copy_on_read;
|
|
|
|
bs_dest->enable_write_cache = bs_src->enable_write_cache;
|
|
|
|
/* i/o timing parameters */
|
|
bs_dest->slice_time = bs_src->slice_time;
|
|
bs_dest->slice_start = bs_src->slice_start;
|
|
bs_dest->slice_end = bs_src->slice_end;
|
|
bs_dest->io_limits = bs_src->io_limits;
|
|
bs_dest->io_base = bs_src->io_base;
|
|
bs_dest->throttled_reqs = bs_src->throttled_reqs;
|
|
bs_dest->block_timer = bs_src->block_timer;
|
|
bs_dest->io_limits_enabled = bs_src->io_limits_enabled;
|
|
|
|
/* r/w error */
|
|
bs_dest->on_read_error = bs_src->on_read_error;
|
|
bs_dest->on_write_error = bs_src->on_write_error;
|
|
|
|
/* i/o status */
|
|
bs_dest->iostatus_enabled = bs_src->iostatus_enabled;
|
|
bs_dest->iostatus = bs_src->iostatus;
|
|
|
|
/* dirty bitmap */
|
|
bs_dest->dirty_count = bs_src->dirty_count;
|
|
bs_dest->dirty_bitmap = bs_src->dirty_bitmap;
|
|
|
|
/* job */
|
|
bs_dest->in_use = bs_src->in_use;
|
|
bs_dest->job = bs_src->job;
|
|
|
|
/* keep the same entry in bdrv_states */
|
|
pstrcpy(bs_dest->device_name, sizeof(bs_dest->device_name),
|
|
bs_src->device_name);
|
|
bs_dest->list = bs_src->list;
|
|
}
|
|
|
|
/*
|
|
* Swap bs contents for two image chains while they are live,
|
|
* while keeping required fields on the BlockDriverState that is
|
|
* actually attached to a device.
|
|
*
|
|
* This will modify the BlockDriverState fields, and swap contents
|
|
* between bs_new and bs_old. Both bs_new and bs_old are modified.
|
|
*
|
|
* bs_new is required to be anonymous.
|
|
*
|
|
* This function does not create any image files.
|
|
*/
|
|
void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old)
|
|
{
|
|
BlockDriverState tmp;
|
|
|
|
/* bs_new must be anonymous and shouldn't have anything fancy enabled */
|
|
assert(bs_new->device_name[0] == '\0');
|
|
assert(bs_new->dirty_bitmap == NULL);
|
|
assert(bs_new->job == NULL);
|
|
assert(bs_new->dev == NULL);
|
|
assert(bs_new->in_use == 0);
|
|
assert(bs_new->io_limits_enabled == false);
|
|
assert(bs_new->block_timer == NULL);
|
|
|
|
tmp = *bs_new;
|
|
*bs_new = *bs_old;
|
|
*bs_old = tmp;
|
|
|
|
/* there are some fields that should not be swapped, move them back */
|
|
bdrv_move_feature_fields(&tmp, bs_old);
|
|
bdrv_move_feature_fields(bs_old, bs_new);
|
|
bdrv_move_feature_fields(bs_new, &tmp);
|
|
|
|
/* bs_new shouldn't be in bdrv_states even after the swap! */
|
|
assert(bs_new->device_name[0] == '\0');
|
|
|
|
/* Check a few fields that should remain attached to the device */
|
|
assert(bs_new->dev == NULL);
|
|
assert(bs_new->job == NULL);
|
|
assert(bs_new->in_use == 0);
|
|
assert(bs_new->io_limits_enabled == false);
|
|
assert(bs_new->block_timer == NULL);
|
|
|
|
bdrv_rebind(bs_new);
|
|
bdrv_rebind(bs_old);
|
|
}
|
|
|
|
/*
|
|
* Add new bs contents at the top of an image chain while the chain is
|
|
* live, while keeping required fields on the top layer.
|
|
*
|
|
* This will modify the BlockDriverState fields, and swap contents
|
|
* between bs_new and bs_top. Both bs_new and bs_top are modified.
|
|
*
|
|
* bs_new is required to be anonymous.
|
|
*
|
|
* This function does not create any image files.
|
|
*/
|
|
void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top)
|
|
{
|
|
bdrv_swap(bs_new, bs_top);
|
|
|
|
/* The contents of 'tmp' will become bs_top, as we are
|
|
* swapping bs_new and bs_top contents. */
|
|
bs_top->backing_hd = bs_new;
|
|
bs_top->open_flags &= ~BDRV_O_NO_BACKING;
|
|
pstrcpy(bs_top->backing_file, sizeof(bs_top->backing_file),
|
|
bs_new->filename);
|
|
pstrcpy(bs_top->backing_format, sizeof(bs_top->backing_format),
|
|
bs_new->drv ? bs_new->drv->format_name : "");
|
|
}
|
|
|
|
void bdrv_delete(BlockDriverState *bs)
|
|
{
|
|
assert(!bs->dev);
|
|
assert(!bs->job);
|
|
assert(!bs->in_use);
|
|
|
|
/* remove from list, if necessary */
|
|
bdrv_make_anon(bs);
|
|
|
|
bdrv_close(bs);
|
|
|
|
assert(bs != bs_snapshots);
|
|
g_free(bs);
|
|
}
|
|
|
|
int bdrv_attach_dev(BlockDriverState *bs, void *dev)
|
|
/* TODO change to DeviceState *dev when all users are qdevified */
|
|
{
|
|
if (bs->dev) {
|
|
return -EBUSY;
|
|
}
|
|
bs->dev = dev;
|
|
bdrv_iostatus_reset(bs);
|
|
return 0;
|
|
}
|
|
|
|
/* TODO qdevified devices don't use this, remove when devices are qdevified */
|
|
void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev)
|
|
{
|
|
if (bdrv_attach_dev(bs, dev) < 0) {
|
|
abort();
|
|
}
|
|
}
|
|
|
|
void bdrv_detach_dev(BlockDriverState *bs, void *dev)
|
|
/* TODO change to DeviceState *dev when all users are qdevified */
|
|
{
|
|
assert(bs->dev == dev);
|
|
bs->dev = NULL;
|
|
bs->dev_ops = NULL;
|
|
bs->dev_opaque = NULL;
|
|
bs->buffer_alignment = 512;
|
|
}
|
|
|
|
/* TODO change to return DeviceState * when all users are qdevified */
|
|
void *bdrv_get_attached_dev(BlockDriverState *bs)
|
|
{
|
|
return bs->dev;
|
|
}
|
|
|
|
void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
|
|
void *opaque)
|
|
{
|
|
bs->dev_ops = ops;
|
|
bs->dev_opaque = opaque;
|
|
if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) {
|
|
bs_snapshots = NULL;
|
|
}
|
|
}
|
|
|
|
void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv,
|
|
enum MonitorEvent ev,
|
|
BlockErrorAction action, bool is_read)
|
|
{
|
|
QObject *data;
|
|
const char *action_str;
|
|
|
|
switch (action) {
|
|
case BDRV_ACTION_REPORT:
|
|
action_str = "report";
|
|
break;
|
|
case BDRV_ACTION_IGNORE:
|
|
action_str = "ignore";
|
|
break;
|
|
case BDRV_ACTION_STOP:
|
|
action_str = "stop";
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
|
|
bdrv->device_name,
|
|
action_str,
|
|
is_read ? "read" : "write");
|
|
monitor_protocol_event(ev, data);
|
|
|
|
qobject_decref(data);
|
|
}
|
|
|
|
static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected)
|
|
{
|
|
QObject *data;
|
|
|
|
data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }",
|
|
bdrv_get_device_name(bs), ejected);
|
|
monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data);
|
|
|
|
qobject_decref(data);
|
|
}
|
|
|
|
static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load)
|
|
{
|
|
if (bs->dev_ops && bs->dev_ops->change_media_cb) {
|
|
bool tray_was_closed = !bdrv_dev_is_tray_open(bs);
|
|
bs->dev_ops->change_media_cb(bs->dev_opaque, load);
|
|
if (tray_was_closed) {
|
|
/* tray open */
|
|
bdrv_emit_qmp_eject_event(bs, true);
|
|
}
|
|
if (load) {
|
|
/* tray close */
|
|
bdrv_emit_qmp_eject_event(bs, false);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool bdrv_dev_has_removable_media(BlockDriverState *bs)
|
|
{
|
|
return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb);
|
|
}
|
|
|
|
void bdrv_dev_eject_request(BlockDriverState *bs, bool force)
|
|
{
|
|
if (bs->dev_ops && bs->dev_ops->eject_request_cb) {
|
|
bs->dev_ops->eject_request_cb(bs->dev_opaque, force);
|
|
}
|
|
}
|
|
|
|
bool bdrv_dev_is_tray_open(BlockDriverState *bs)
|
|
{
|
|
if (bs->dev_ops && bs->dev_ops->is_tray_open) {
|
|
return bs->dev_ops->is_tray_open(bs->dev_opaque);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static void bdrv_dev_resize_cb(BlockDriverState *bs)
|
|
{
|
|
if (bs->dev_ops && bs->dev_ops->resize_cb) {
|
|
bs->dev_ops->resize_cb(bs->dev_opaque);
|
|
}
|
|
}
|
|
|
|
bool bdrv_dev_is_medium_locked(BlockDriverState *bs)
|
|
{
|
|
if (bs->dev_ops && bs->dev_ops->is_medium_locked) {
|
|
return bs->dev_ops->is_medium_locked(bs->dev_opaque);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Run consistency checks on an image
|
|
*
|
|
* Returns 0 if the check could be completed (it doesn't mean that the image is
|
|
* free of errors) or -errno when an internal error occurred. The results of the
|
|
* check are stored in res.
|
|
*/
|
|
int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix)
|
|
{
|
|
if (bs->drv->bdrv_check == NULL) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
memset(res, 0, sizeof(*res));
|
|
return bs->drv->bdrv_check(bs, res, fix);
|
|
}
|
|
|
|
#define COMMIT_BUF_SECTORS 2048
|
|
|
|
/* commit COW file into the raw image */
|
|
int bdrv_commit(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
int64_t sector, total_sectors;
|
|
int n, ro, open_flags;
|
|
int ret = 0;
|
|
uint8_t *buf;
|
|
char filename[PATH_MAX];
|
|
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
|
|
if (!bs->backing_hd) {
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) {
|
|
return -EBUSY;
|
|
}
|
|
|
|
ro = bs->backing_hd->read_only;
|
|
/* Use pstrcpy (not strncpy): filename must be NUL-terminated. */
|
|
pstrcpy(filename, sizeof(filename), bs->backing_hd->filename);
|
|
open_flags = bs->backing_hd->open_flags;
|
|
|
|
if (ro) {
|
|
if (bdrv_reopen(bs->backing_hd, open_flags | BDRV_O_RDWR, NULL)) {
|
|
return -EACCES;
|
|
}
|
|
}
|
|
|
|
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
|
|
buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE);
|
|
|
|
for (sector = 0; sector < total_sectors; sector += n) {
|
|
if (bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) {
|
|
|
|
if (bdrv_read(bs, sector, buf, n) != 0) {
|
|
ret = -EIO;
|
|
goto ro_cleanup;
|
|
}
|
|
|
|
if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) {
|
|
ret = -EIO;
|
|
goto ro_cleanup;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (drv->bdrv_make_empty) {
|
|
ret = drv->bdrv_make_empty(bs);
|
|
bdrv_flush(bs);
|
|
}
|
|
|
|
/*
|
|
* Make sure all data we wrote to the backing device is actually
|
|
* stable on disk.
|
|
*/
|
|
if (bs->backing_hd)
|
|
bdrv_flush(bs->backing_hd);
|
|
|
|
ro_cleanup:
|
|
g_free(buf);
|
|
|
|
if (ro) {
|
|
/* ignoring error return here */
|
|
bdrv_reopen(bs->backing_hd, open_flags & ~BDRV_O_RDWR, NULL);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int bdrv_commit_all(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
int ret = bdrv_commit(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct BdrvTrackedRequest {
|
|
BlockDriverState *bs;
|
|
int64_t sector_num;
|
|
int nb_sectors;
|
|
bool is_write;
|
|
QLIST_ENTRY(BdrvTrackedRequest) list;
|
|
Coroutine *co; /* owner, used for deadlock detection */
|
|
CoQueue wait_queue; /* coroutines blocked on this request */
|
|
};
|
|
|
|
/**
|
|
* Remove an active request from the tracked requests list
|
|
*
|
|
* This function should be called when a tracked request is completing.
|
|
*/
|
|
static void tracked_request_end(BdrvTrackedRequest *req)
|
|
{
|
|
QLIST_REMOVE(req, list);
|
|
qemu_co_queue_restart_all(&req->wait_queue);
|
|
}
|
|
|
|
/**
|
|
* Add an active request to the tracked requests list
|
|
*/
|
|
static void tracked_request_begin(BdrvTrackedRequest *req,
|
|
BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
int nb_sectors, bool is_write)
|
|
{
|
|
*req = (BdrvTrackedRequest){
|
|
.bs = bs,
|
|
.sector_num = sector_num,
|
|
.nb_sectors = nb_sectors,
|
|
.is_write = is_write,
|
|
.co = qemu_coroutine_self(),
|
|
};
|
|
|
|
qemu_co_queue_init(&req->wait_queue);
|
|
|
|
QLIST_INSERT_HEAD(&bs->tracked_requests, req, list);
|
|
}
|
|
|
|
/**
|
|
* Round a region to cluster boundaries
|
|
*/
|
|
static void round_to_clusters(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors,
|
|
int64_t *cluster_sector_num,
|
|
int *cluster_nb_sectors)
|
|
{
|
|
BlockDriverInfo bdi;
|
|
|
|
if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) {
|
|
*cluster_sector_num = sector_num;
|
|
*cluster_nb_sectors = nb_sectors;
|
|
} else {
|
|
int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE;
|
|
*cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c);
|
|
*cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num +
|
|
nb_sectors, c);
|
|
}
|
|
}
|
|
|
|
static bool tracked_request_overlaps(BdrvTrackedRequest *req,
|
|
int64_t sector_num, int nb_sectors) {
|
|
/* aaaa bbbb */
|
|
if (sector_num >= req->sector_num + req->nb_sectors) {
|
|
return false;
|
|
}
|
|
/* bbbb aaaa */
|
|
if (req->sector_num >= sector_num + nb_sectors) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors)
|
|
{
|
|
BdrvTrackedRequest *req;
|
|
int64_t cluster_sector_num;
|
|
int cluster_nb_sectors;
|
|
bool retry;
|
|
|
|
/* If we touch the same cluster it counts as an overlap. This guarantees
|
|
* that allocating writes will be serialized and not race with each other
|
|
* for the same cluster. For example, in copy-on-read it ensures that the
|
|
* CoR read and write operations are atomic and guest writes cannot
|
|
* interleave between them.
|
|
*/
|
|
round_to_clusters(bs, sector_num, nb_sectors,
|
|
&cluster_sector_num, &cluster_nb_sectors);
|
|
|
|
do {
|
|
retry = false;
|
|
QLIST_FOREACH(req, &bs->tracked_requests, list) {
|
|
if (tracked_request_overlaps(req, cluster_sector_num,
|
|
cluster_nb_sectors)) {
|
|
/* Hitting this means there was a reentrant request, for
|
|
* example, a block driver issuing nested requests. This must
|
|
* never happen since it means deadlock.
|
|
*/
|
|
assert(qemu_coroutine_self() != req->co);
|
|
|
|
qemu_co_queue_wait(&req->wait_queue);
|
|
retry = true;
|
|
break;
|
|
}
|
|
}
|
|
} while (retry);
|
|
}
|
|
|
|
/*
|
|
* Return values:
|
|
* 0 - success
|
|
* -EINVAL - backing format specified, but no file
|
|
* -ENOSPC - can't update the backing file because no space is left in the
|
|
* image file header
|
|
* -ENOTSUP - format driver doesn't support changing the backing file
|
|
*/
|
|
int bdrv_change_backing_file(BlockDriverState *bs,
|
|
const char *backing_file, const char *backing_fmt)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
int ret;
|
|
|
|
/* Backing file format doesn't make sense without a backing file */
|
|
if (backing_fmt && !backing_file) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (drv->bdrv_change_backing_file != NULL) {
|
|
ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
|
|
} else {
|
|
ret = -ENOTSUP;
|
|
}
|
|
|
|
if (ret == 0) {
|
|
pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: "");
|
|
pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: "");
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Finds the image layer in the chain that has 'bs' as its backing file.
|
|
*
|
|
* active is the current topmost image.
|
|
*
|
|
* Returns NULL if bs is not found in active's image chain,
|
|
* or if active == bs.
|
|
*/
|
|
BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
|
|
BlockDriverState *bs)
|
|
{
|
|
BlockDriverState *overlay = NULL;
|
|
BlockDriverState *intermediate;
|
|
|
|
assert(active != NULL);
|
|
assert(bs != NULL);
|
|
|
|
/* if bs is the same as active, then by definition it has no overlay
|
|
*/
|
|
if (active == bs) {
|
|
return NULL;
|
|
}
|
|
|
|
intermediate = active;
|
|
while (intermediate->backing_hd) {
|
|
if (intermediate->backing_hd == bs) {
|
|
overlay = intermediate;
|
|
break;
|
|
}
|
|
intermediate = intermediate->backing_hd;
|
|
}
|
|
|
|
return overlay;
|
|
}
|
|
|
|
typedef struct BlkIntermediateStates {
|
|
BlockDriverState *bs;
|
|
QSIMPLEQ_ENTRY(BlkIntermediateStates) entry;
|
|
} BlkIntermediateStates;
|
|
|
|
|
|
/*
|
|
* Drops images above 'base' up to and including 'top', and sets the image
|
|
* above 'top' to have base as its backing file.
|
|
*
|
|
* Requires that the overlay to 'top' is opened r/w, so that the backing file
|
|
* information in 'bs' can be properly updated.
|
|
*
|
|
* E.g., this will convert the following chain:
|
|
* bottom <- base <- intermediate <- top <- active
|
|
*
|
|
* to
|
|
*
|
|
* bottom <- base <- active
|
|
*
|
|
* It is allowed for bottom==base, in which case it converts:
|
|
*
|
|
* base <- intermediate <- top <- active
|
|
*
|
|
* to
|
|
*
|
|
* base <- active
|
|
*
|
|
* Error conditions:
|
|
* if active == top, that is considered an error
|
|
*
|
|
*/
|
|
int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
|
|
BlockDriverState *base)
|
|
{
|
|
BlockDriverState *intermediate;
|
|
BlockDriverState *base_bs = NULL;
|
|
BlockDriverState *new_top_bs = NULL;
|
|
BlkIntermediateStates *intermediate_state, *next;
|
|
int ret = -EIO;
|
|
|
|
QSIMPLEQ_HEAD(states_to_delete, BlkIntermediateStates) states_to_delete;
|
|
QSIMPLEQ_INIT(&states_to_delete);
|
|
|
|
if (!top->drv || !base->drv) {
|
|
goto exit;
|
|
}
|
|
|
|
new_top_bs = bdrv_find_overlay(active, top);
|
|
|
|
if (new_top_bs == NULL) {
|
|
/* we could not find the image above 'top', this is an error */
|
|
goto exit;
|
|
}
|
|
|
|
/* special case of new_top_bs->backing_hd already pointing to base - nothing
|
|
* to do, no intermediate images */
|
|
if (new_top_bs->backing_hd == base) {
|
|
ret = 0;
|
|
goto exit;
|
|
}
|
|
|
|
intermediate = top;
|
|
|
|
/* now we will go down through the list, and add each BDS we find
|
|
* into our deletion queue, until we hit the 'base'
|
|
*/
|
|
while (intermediate) {
|
|
intermediate_state = g_malloc0(sizeof(BlkIntermediateStates));
|
|
intermediate_state->bs = intermediate;
|
|
QSIMPLEQ_INSERT_TAIL(&states_to_delete, intermediate_state, entry);
|
|
|
|
if (intermediate->backing_hd == base) {
|
|
base_bs = intermediate->backing_hd;
|
|
break;
|
|
}
|
|
intermediate = intermediate->backing_hd;
|
|
}
|
|
if (base_bs == NULL) {
|
|
/* something went wrong, we did not end at the base. safely
|
|
* unravel everything, and exit with error */
|
|
goto exit;
|
|
}
|
|
|
|
/* success - we can delete the intermediate states, and link top->base */
|
|
ret = bdrv_change_backing_file(new_top_bs, base_bs->filename,
|
|
base_bs->drv ? base_bs->drv->format_name : "");
|
|
if (ret) {
|
|
goto exit;
|
|
}
|
|
new_top_bs->backing_hd = base_bs;
|
|
|
|
|
|
QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) {
|
|
/* so that bdrv_close() does not recursively close the chain */
|
|
intermediate_state->bs->backing_hd = NULL;
|
|
bdrv_delete(intermediate_state->bs);
|
|
}
|
|
ret = 0;
|
|
|
|
exit:
|
|
QSIMPLEQ_FOREACH_SAFE(intermediate_state, &states_to_delete, entry, next) {
|
|
g_free(intermediate_state);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
|
|
size_t size)
|
|
{
|
|
int64_t len;
|
|
|
|
if (!bdrv_is_inserted(bs))
|
|
return -ENOMEDIUM;
|
|
|
|
if (bs->growable)
|
|
return 0;
|
|
|
|
len = bdrv_getlength(bs);
|
|
|
|
if (offset < 0)
|
|
return -EIO;
|
|
|
|
if ((offset > len) || (len - offset < size))
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors)
|
|
{
|
|
return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
|
|
nb_sectors * BDRV_SECTOR_SIZE);
|
|
}
|
|
|
|
typedef struct RwCo {
|
|
BlockDriverState *bs;
|
|
int64_t sector_num;
|
|
int nb_sectors;
|
|
QEMUIOVector *qiov;
|
|
bool is_write;
|
|
int ret;
|
|
} RwCo;
|
|
|
|
static void coroutine_fn bdrv_rw_co_entry(void *opaque)
|
|
{
|
|
RwCo *rwco = opaque;
|
|
|
|
if (!rwco->is_write) {
|
|
rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num,
|
|
rwco->nb_sectors, rwco->qiov, 0);
|
|
} else {
|
|
rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num,
|
|
rwco->nb_sectors, rwco->qiov, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Process a synchronous request using coroutines
|
|
*/
|
|
static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf,
|
|
int nb_sectors, bool is_write)
|
|
{
|
|
QEMUIOVector qiov;
|
|
struct iovec iov = {
|
|
.iov_base = (void *)buf,
|
|
.iov_len = nb_sectors * BDRV_SECTOR_SIZE,
|
|
};
|
|
Coroutine *co;
|
|
RwCo rwco = {
|
|
.bs = bs,
|
|
.sector_num = sector_num,
|
|
.nb_sectors = nb_sectors,
|
|
.qiov = &qiov,
|
|
.is_write = is_write,
|
|
.ret = NOT_DONE,
|
|
};
|
|
|
|
qemu_iovec_init_external(&qiov, &iov, 1);
|
|
|
|
/**
|
|
* In sync call context, when the vcpu is blocked, this throttling timer
|
|
* will not fire; so the I/O throttling function has to be disabled here
|
|
* if it has been enabled.
|
|
*/
|
|
if (bs->io_limits_enabled) {
|
|
fprintf(stderr, "Disabling I/O throttling on '%s' due "
|
|
"to synchronous I/O.\n", bdrv_get_device_name(bs));
|
|
bdrv_io_limits_disable(bs);
|
|
}
|
|
|
|
if (qemu_in_coroutine()) {
|
|
/* Fast-path if already in coroutine context */
|
|
bdrv_rw_co_entry(&rwco);
|
|
} else {
|
|
co = qemu_coroutine_create(bdrv_rw_co_entry);
|
|
qemu_coroutine_enter(co, &rwco);
|
|
while (rwco.ret == NOT_DONE) {
|
|
qemu_aio_wait();
|
|
}
|
|
}
|
|
return rwco.ret;
|
|
}
|
|
|
|
/* return < 0 if error. See bdrv_write() for the return codes */
|
|
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
|
uint8_t *buf, int nb_sectors)
|
|
{
|
|
return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false);
|
|
}
|
|
|
|
/* Just like bdrv_read(), but with I/O throttling temporarily disabled */
|
|
int bdrv_read_unthrottled(BlockDriverState *bs, int64_t sector_num,
|
|
uint8_t *buf, int nb_sectors)
|
|
{
|
|
bool enabled;
|
|
int ret;
|
|
|
|
enabled = bs->io_limits_enabled;
|
|
bs->io_limits_enabled = false;
|
|
ret = bdrv_read(bs, 0, buf, 1);
|
|
bs->io_limits_enabled = enabled;
|
|
return ret;
|
|
}
|
|
|
|
#define BITS_PER_LONG (sizeof(unsigned long) * 8)
|
|
|
|
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors, int dirty)
|
|
{
|
|
int64_t start, end;
|
|
unsigned long val, idx, bit;
|
|
|
|
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
|
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
|
|
|
for (; start <= end; start++) {
|
|
idx = start / BITS_PER_LONG;
|
|
bit = start % BITS_PER_LONG;
|
|
val = bs->dirty_bitmap[idx];
|
|
if (dirty) {
|
|
if (!(val & (1UL << bit))) {
|
|
bs->dirty_count++;
|
|
val |= 1UL << bit;
|
|
}
|
|
} else {
|
|
if (val & (1UL << bit)) {
|
|
bs->dirty_count--;
|
|
val &= ~(1UL << bit);
|
|
}
|
|
}
|
|
bs->dirty_bitmap[idx] = val;
|
|
}
|
|
}
|
|
|
|
/* Return < 0 if error. Important errors are:
|
|
-EIO generic I/O error (may happen for all errors)
|
|
-ENOMEDIUM No media inserted.
|
|
-EINVAL Invalid sector number or nb_sectors
|
|
-EACCES Trying to write a read-only device
|
|
*/
|
|
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
|
const uint8_t *buf, int nb_sectors)
|
|
{
|
|
return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true);
|
|
}
|
|
|
|
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
|
void *buf, int count1)
|
|
{
|
|
uint8_t tmp_buf[BDRV_SECTOR_SIZE];
|
|
int len, nb_sectors, count;
|
|
int64_t sector_num;
|
|
int ret;
|
|
|
|
count = count1;
|
|
/* first read to align to sector start */
|
|
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
|
if (len > count)
|
|
len = count;
|
|
sector_num = offset >> BDRV_SECTOR_BITS;
|
|
if (len > 0) {
|
|
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
|
|
count -= len;
|
|
if (count == 0)
|
|
return count1;
|
|
sector_num++;
|
|
buf += len;
|
|
}
|
|
|
|
/* read the sectors "in place" */
|
|
nb_sectors = count >> BDRV_SECTOR_BITS;
|
|
if (nb_sectors > 0) {
|
|
if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
|
|
return ret;
|
|
sector_num += nb_sectors;
|
|
len = nb_sectors << BDRV_SECTOR_BITS;
|
|
buf += len;
|
|
count -= len;
|
|
}
|
|
|
|
/* add data from the last sector */
|
|
if (count > 0) {
|
|
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
memcpy(buf, tmp_buf, count);
|
|
}
|
|
return count1;
|
|
}
|
|
|
|
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
|
const void *buf, int count1)
|
|
{
|
|
uint8_t tmp_buf[BDRV_SECTOR_SIZE];
|
|
int len, nb_sectors, count;
|
|
int64_t sector_num;
|
|
int ret;
|
|
|
|
count = count1;
|
|
/* first write to align to sector start */
|
|
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
|
if (len > count)
|
|
len = count;
|
|
sector_num = offset >> BDRV_SECTOR_BITS;
|
|
if (len > 0) {
|
|
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
|
|
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
count -= len;
|
|
if (count == 0)
|
|
return count1;
|
|
sector_num++;
|
|
buf += len;
|
|
}
|
|
|
|
/* write the sectors "in place" */
|
|
nb_sectors = count >> BDRV_SECTOR_BITS;
|
|
if (nb_sectors > 0) {
|
|
if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
|
|
return ret;
|
|
sector_num += nb_sectors;
|
|
len = nb_sectors << BDRV_SECTOR_BITS;
|
|
buf += len;
|
|
count -= len;
|
|
}
|
|
|
|
/* add data from the last sector */
|
|
if (count > 0) {
|
|
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
memcpy(tmp_buf, buf, count);
|
|
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
|
|
return ret;
|
|
}
|
|
return count1;
|
|
}
|
|
|
|
/*
|
|
* Writes to the file and ensures that no writes are reordered across this
|
|
* request (acts as a barrier)
|
|
*
|
|
* Returns 0 on success, -errno in error cases.
|
|
*/
|
|
int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
|
|
const void *buf, int count)
|
|
{
|
|
int ret;
|
|
|
|
ret = bdrv_pwrite(bs, offset, buf, count);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
/* No flush needed for cache modes that already do it */
|
|
if (bs->enable_write_cache) {
|
|
bdrv_flush(bs);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
|
|
{
|
|
/* Perform I/O through a temporary buffer so that users who scribble over
|
|
* their read buffer while the operation is in progress do not end up
|
|
* modifying the image file. This is critical for zero-copy guest I/O
|
|
* where anything might happen inside guest memory.
|
|
*/
|
|
void *bounce_buffer;
|
|
|
|
BlockDriver *drv = bs->drv;
|
|
struct iovec iov;
|
|
QEMUIOVector bounce_qiov;
|
|
int64_t cluster_sector_num;
|
|
int cluster_nb_sectors;
|
|
size_t skip_bytes;
|
|
int ret;
|
|
|
|
/* Cover entire cluster so no additional backing file I/O is required when
|
|
* allocating cluster in the image file.
|
|
*/
|
|
round_to_clusters(bs, sector_num, nb_sectors,
|
|
&cluster_sector_num, &cluster_nb_sectors);
|
|
|
|
trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors,
|
|
cluster_sector_num, cluster_nb_sectors);
|
|
|
|
iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE;
|
|
iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len);
|
|
qemu_iovec_init_external(&bounce_qiov, &iov, 1);
|
|
|
|
ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors,
|
|
&bounce_qiov);
|
|
if (ret < 0) {
|
|
goto err;
|
|
}
|
|
|
|
if (drv->bdrv_co_write_zeroes &&
|
|
buffer_is_zero(bounce_buffer, iov.iov_len)) {
|
|
ret = bdrv_co_do_write_zeroes(bs, cluster_sector_num,
|
|
cluster_nb_sectors);
|
|
} else {
|
|
/* This does not change the data on the disk, it is not necessary
|
|
* to flush even in cache=writethrough mode.
|
|
*/
|
|
ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors,
|
|
&bounce_qiov);
|
|
}
|
|
|
|
if (ret < 0) {
|
|
/* It might be okay to ignore write errors for guest requests. If this
|
|
* is a deliberate copy-on-read then we don't want to ignore the error.
|
|
* Simply report it in all cases.
|
|
*/
|
|
goto err;
|
|
}
|
|
|
|
skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE;
|
|
qemu_iovec_from_buf(qiov, 0, bounce_buffer + skip_bytes,
|
|
nb_sectors * BDRV_SECTOR_SIZE);
|
|
|
|
err:
|
|
qemu_vfree(bounce_buffer);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Handle a read request in coroutine context
|
|
*/
|
|
static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
BdrvTrackedRequest req;
|
|
int ret;
|
|
|
|
if (!drv) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
if (bdrv_check_request(bs, sector_num, nb_sectors)) {
|
|
return -EIO;
|
|
}
|
|
|
|
/* throttling disk read I/O */
|
|
if (bs->io_limits_enabled) {
|
|
bdrv_io_limits_intercept(bs, false, nb_sectors);
|
|
}
|
|
|
|
if (bs->copy_on_read) {
|
|
flags |= BDRV_REQ_COPY_ON_READ;
|
|
}
|
|
if (flags & BDRV_REQ_COPY_ON_READ) {
|
|
bs->copy_on_read_in_flight++;
|
|
}
|
|
|
|
if (bs->copy_on_read_in_flight) {
|
|
wait_for_overlapping_requests(bs, sector_num, nb_sectors);
|
|
}
|
|
|
|
tracked_request_begin(&req, bs, sector_num, nb_sectors, false);
|
|
|
|
if (flags & BDRV_REQ_COPY_ON_READ) {
|
|
int pnum;
|
|
|
|
ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum);
|
|
if (ret < 0) {
|
|
goto out;
|
|
}
|
|
|
|
if (!ret || pnum != nb_sectors) {
|
|
ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov);
|
|
|
|
out:
|
|
tracked_request_end(&req);
|
|
|
|
if (flags & BDRV_REQ_COPY_ON_READ) {
|
|
bs->copy_on_read_in_flight--;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors, QEMUIOVector *qiov)
|
|
{
|
|
trace_bdrv_co_readv(bs, sector_num, nb_sectors);
|
|
|
|
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0);
|
|
}
|
|
|
|
int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
|
|
{
|
|
trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors);
|
|
|
|
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov,
|
|
BDRV_REQ_COPY_ON_READ);
|
|
}
|
|
|
|
static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
QEMUIOVector qiov;
|
|
struct iovec iov;
|
|
int ret;
|
|
|
|
/* TODO Emulate only part of misaligned requests instead of letting block
|
|
* drivers return -ENOTSUP and emulate everything */
|
|
|
|
/* First try the efficient write zeroes operation */
|
|
if (drv->bdrv_co_write_zeroes) {
|
|
ret = drv->bdrv_co_write_zeroes(bs, sector_num, nb_sectors);
|
|
if (ret != -ENOTSUP) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* Fall back to bounce buffer if write zeroes is unsupported */
|
|
iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE;
|
|
iov.iov_base = qemu_blockalign(bs, iov.iov_len);
|
|
memset(iov.iov_base, 0, iov.iov_len);
|
|
qemu_iovec_init_external(&qiov, &iov, 1);
|
|
|
|
ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, &qiov);
|
|
|
|
qemu_vfree(iov.iov_base);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Handle a write request in coroutine context
|
|
*/
|
|
static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
|
|
BdrvRequestFlags flags)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
BdrvTrackedRequest req;
|
|
int ret;
|
|
|
|
if (!bs->drv) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
if (bs->read_only) {
|
|
return -EACCES;
|
|
}
|
|
if (bdrv_check_request(bs, sector_num, nb_sectors)) {
|
|
return -EIO;
|
|
}
|
|
|
|
/* throttling disk write I/O */
|
|
if (bs->io_limits_enabled) {
|
|
bdrv_io_limits_intercept(bs, true, nb_sectors);
|
|
}
|
|
|
|
if (bs->copy_on_read_in_flight) {
|
|
wait_for_overlapping_requests(bs, sector_num, nb_sectors);
|
|
}
|
|
|
|
tracked_request_begin(&req, bs, sector_num, nb_sectors, true);
|
|
|
|
if (flags & BDRV_REQ_ZERO_WRITE) {
|
|
ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors);
|
|
} else {
|
|
ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov);
|
|
}
|
|
|
|
if (ret == 0 && !bs->enable_write_cache) {
|
|
ret = bdrv_co_flush(bs);
|
|
}
|
|
|
|
if (bs->dirty_bitmap) {
|
|
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
|
}
|
|
|
|
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
|
|
bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
|
}
|
|
|
|
tracked_request_end(&req);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors, QEMUIOVector *qiov)
|
|
{
|
|
trace_bdrv_co_writev(bs, sector_num, nb_sectors);
|
|
|
|
return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0);
|
|
}
|
|
|
|
int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors)
|
|
{
|
|
trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors);
|
|
|
|
return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL,
|
|
BDRV_REQ_ZERO_WRITE);
|
|
}
|
|
|
|
/**
|
|
* Truncate file to 'offset' bytes (needed only for file protocols)
|
|
*/
|
|
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
int ret;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_truncate)
|
|
return -ENOTSUP;
|
|
if (bs->read_only)
|
|
return -EACCES;
|
|
if (bdrv_in_use(bs))
|
|
return -EBUSY;
|
|
ret = drv->bdrv_truncate(bs, offset);
|
|
if (ret == 0) {
|
|
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
|
|
bdrv_dev_resize_cb(bs);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* Length of a allocated file in bytes. Sparse files are counted by actual
|
|
* allocated space. Return < 0 if error or unknown.
|
|
*/
|
|
int64_t bdrv_get_allocated_file_size(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
if (drv->bdrv_get_allocated_file_size) {
|
|
return drv->bdrv_get_allocated_file_size(bs);
|
|
}
|
|
if (bs->file) {
|
|
return bdrv_get_allocated_file_size(bs->file);
|
|
}
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
/**
|
|
* Length of a file in bytes. Return < 0 if error or unknown.
|
|
*/
|
|
int64_t bdrv_getlength(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
|
|
if (bs->growable || bdrv_dev_has_removable_media(bs)) {
|
|
if (drv->bdrv_getlength) {
|
|
return drv->bdrv_getlength(bs);
|
|
}
|
|
}
|
|
return bs->total_sectors * BDRV_SECTOR_SIZE;
|
|
}
|
|
|
|
/* return 0 as number of sectors if no device present or error */
|
|
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
|
{
|
|
int64_t length;
|
|
length = bdrv_getlength(bs);
|
|
if (length < 0)
|
|
length = 0;
|
|
else
|
|
length = length >> BDRV_SECTOR_BITS;
|
|
*nb_sectors_ptr = length;
|
|
}
|
|
|
|
/* throttling disk io limits */
|
|
void bdrv_set_io_limits(BlockDriverState *bs,
|
|
BlockIOLimit *io_limits)
|
|
{
|
|
bs->io_limits = *io_limits;
|
|
bs->io_limits_enabled = bdrv_io_limits_enabled(bs);
|
|
}
|
|
|
|
void bdrv_set_on_error(BlockDriverState *bs, BlockdevOnError on_read_error,
|
|
BlockdevOnError on_write_error)
|
|
{
|
|
bs->on_read_error = on_read_error;
|
|
bs->on_write_error = on_write_error;
|
|
}
|
|
|
|
BlockdevOnError bdrv_get_on_error(BlockDriverState *bs, bool is_read)
|
|
{
|
|
return is_read ? bs->on_read_error : bs->on_write_error;
|
|
}
|
|
|
|
BlockErrorAction bdrv_get_error_action(BlockDriverState *bs, bool is_read, int error)
|
|
{
|
|
BlockdevOnError on_err = is_read ? bs->on_read_error : bs->on_write_error;
|
|
|
|
switch (on_err) {
|
|
case BLOCKDEV_ON_ERROR_ENOSPC:
|
|
return (error == ENOSPC) ? BDRV_ACTION_STOP : BDRV_ACTION_REPORT;
|
|
case BLOCKDEV_ON_ERROR_STOP:
|
|
return BDRV_ACTION_STOP;
|
|
case BLOCKDEV_ON_ERROR_REPORT:
|
|
return BDRV_ACTION_REPORT;
|
|
case BLOCKDEV_ON_ERROR_IGNORE:
|
|
return BDRV_ACTION_IGNORE;
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
|
|
/* This is done by device models because, while the block layer knows
|
|
* about the error, it does not know whether an operation comes from
|
|
* the device or the block layer (from a job, for example).
|
|
*/
|
|
void bdrv_error_action(BlockDriverState *bs, BlockErrorAction action,
|
|
bool is_read, int error)
|
|
{
|
|
assert(error >= 0);
|
|
bdrv_emit_qmp_error_event(bs, QEVENT_BLOCK_IO_ERROR, action, is_read);
|
|
if (action == BDRV_ACTION_STOP) {
|
|
vm_stop(RUN_STATE_IO_ERROR);
|
|
bdrv_iostatus_set_err(bs, error);
|
|
}
|
|
}
|
|
|
|
int bdrv_is_read_only(BlockDriverState *bs)
|
|
{
|
|
return bs->read_only;
|
|
}
|
|
|
|
int bdrv_is_sg(BlockDriverState *bs)
|
|
{
|
|
return bs->sg;
|
|
}
|
|
|
|
int bdrv_enable_write_cache(BlockDriverState *bs)
|
|
{
|
|
return bs->enable_write_cache;
|
|
}
|
|
|
|
void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce)
|
|
{
|
|
bs->enable_write_cache = wce;
|
|
|
|
/* so a reopen() will preserve wce */
|
|
if (wce) {
|
|
bs->open_flags |= BDRV_O_CACHE_WB;
|
|
} else {
|
|
bs->open_flags &= ~BDRV_O_CACHE_WB;
|
|
}
|
|
}
|
|
|
|
int bdrv_is_encrypted(BlockDriverState *bs)
|
|
{
|
|
if (bs->backing_hd && bs->backing_hd->encrypted)
|
|
return 1;
|
|
return bs->encrypted;
|
|
}
|
|
|
|
int bdrv_key_required(BlockDriverState *bs)
|
|
{
|
|
BlockDriverState *backing_hd = bs->backing_hd;
|
|
|
|
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
|
return 1;
|
|
return (bs->encrypted && !bs->valid_key);
|
|
}
|
|
|
|
int bdrv_set_key(BlockDriverState *bs, const char *key)
|
|
{
|
|
int ret;
|
|
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
|
ret = bdrv_set_key(bs->backing_hd, key);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (!bs->encrypted)
|
|
return 0;
|
|
}
|
|
if (!bs->encrypted) {
|
|
return -EINVAL;
|
|
} else if (!bs->drv || !bs->drv->bdrv_set_key) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
ret = bs->drv->bdrv_set_key(bs, key);
|
|
if (ret < 0) {
|
|
bs->valid_key = 0;
|
|
} else if (!bs->valid_key) {
|
|
bs->valid_key = 1;
|
|
/* call the change callback now, we skipped it on open */
|
|
bdrv_dev_change_media_cb(bs, true);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
const char *bdrv_get_format_name(BlockDriverState *bs)
|
|
{
|
|
return bs->drv ? bs->drv->format_name : NULL;
|
|
}
|
|
|
|
void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
|
|
void *opaque)
|
|
{
|
|
BlockDriver *drv;
|
|
|
|
QLIST_FOREACH(drv, &bdrv_drivers, list) {
|
|
it(opaque, drv->format_name);
|
|
}
|
|
}
|
|
|
|
BlockDriverState *bdrv_find(const char *name)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
if (!strcmp(name, bs->device_name)) {
|
|
return bs;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
BlockDriverState *bdrv_next(BlockDriverState *bs)
|
|
{
|
|
if (!bs) {
|
|
return QTAILQ_FIRST(&bdrv_states);
|
|
}
|
|
return QTAILQ_NEXT(bs, list);
|
|
}
|
|
|
|
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
it(opaque, bs);
|
|
}
|
|
}
|
|
|
|
const char *bdrv_get_device_name(BlockDriverState *bs)
|
|
{
|
|
return bs->device_name;
|
|
}
|
|
|
|
int bdrv_get_flags(BlockDriverState *bs)
|
|
{
|
|
return bs->open_flags;
|
|
}
|
|
|
|
void bdrv_flush_all(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
bdrv_flush(bs);
|
|
}
|
|
}
|
|
|
|
int bdrv_has_zero_init(BlockDriverState *bs)
|
|
{
|
|
assert(bs->drv);
|
|
|
|
if (bs->drv->bdrv_has_zero_init) {
|
|
return bs->drv->bdrv_has_zero_init(bs);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
typedef struct BdrvCoIsAllocatedData {
|
|
BlockDriverState *bs;
|
|
int64_t sector_num;
|
|
int nb_sectors;
|
|
int *pnum;
|
|
int ret;
|
|
bool done;
|
|
} BdrvCoIsAllocatedData;
|
|
|
|
/*
|
|
* Returns true iff the specified sector is present in the disk image. Drivers
|
|
* not implementing the functionality are assumed to not support backing files,
|
|
* hence all their sectors are reported as allocated.
|
|
*
|
|
* If 'sector_num' is beyond the end of the disk image the return value is 0
|
|
* and 'pnum' is set to 0.
|
|
*
|
|
* 'pnum' is set to the number of sectors (including and immediately following
|
|
* the specified sector) that are known to be in the same
|
|
* allocated/unallocated state.
|
|
*
|
|
* 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
|
|
* beyond the end of the disk image it will be clamped.
|
|
*/
|
|
int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors, int *pnum)
|
|
{
|
|
int64_t n;
|
|
|
|
if (sector_num >= bs->total_sectors) {
|
|
*pnum = 0;
|
|
return 0;
|
|
}
|
|
|
|
n = bs->total_sectors - sector_num;
|
|
if (n < nb_sectors) {
|
|
nb_sectors = n;
|
|
}
|
|
|
|
if (!bs->drv->bdrv_co_is_allocated) {
|
|
*pnum = nb_sectors;
|
|
return 1;
|
|
}
|
|
|
|
return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum);
|
|
}
|
|
|
|
/* Coroutine wrapper for bdrv_is_allocated() */
|
|
static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque)
|
|
{
|
|
BdrvCoIsAllocatedData *data = opaque;
|
|
BlockDriverState *bs = data->bs;
|
|
|
|
data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors,
|
|
data->pnum);
|
|
data->done = true;
|
|
}
|
|
|
|
/*
|
|
* Synchronous wrapper around bdrv_co_is_allocated().
|
|
*
|
|
* See bdrv_co_is_allocated() for details.
|
|
*/
|
|
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
|
|
int *pnum)
|
|
{
|
|
Coroutine *co;
|
|
BdrvCoIsAllocatedData data = {
|
|
.bs = bs,
|
|
.sector_num = sector_num,
|
|
.nb_sectors = nb_sectors,
|
|
.pnum = pnum,
|
|
.done = false,
|
|
};
|
|
|
|
co = qemu_coroutine_create(bdrv_is_allocated_co_entry);
|
|
qemu_coroutine_enter(co, &data);
|
|
while (!data.done) {
|
|
qemu_aio_wait();
|
|
}
|
|
return data.ret;
|
|
}
|
|
|
|
/*
|
|
* Given an image chain: ... -> [BASE] -> [INTER1] -> [INTER2] -> [TOP]
|
|
*
|
|
* Return true if the given sector is allocated in any image between
|
|
* BASE and TOP (inclusive). BASE can be NULL to check if the given
|
|
* sector is allocated in any image of the chain. Return false otherwise.
|
|
*
|
|
* 'pnum' is set to the number of sectors (including and immediately following
|
|
* the specified sector) that are known to be in the same
|
|
* allocated/unallocated state.
|
|
*
|
|
*/
|
|
int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top,
|
|
BlockDriverState *base,
|
|
int64_t sector_num,
|
|
int nb_sectors, int *pnum)
|
|
{
|
|
BlockDriverState *intermediate;
|
|
int ret, n = nb_sectors;
|
|
|
|
intermediate = top;
|
|
while (intermediate && intermediate != base) {
|
|
int pnum_inter;
|
|
ret = bdrv_co_is_allocated(intermediate, sector_num, nb_sectors,
|
|
&pnum_inter);
|
|
if (ret < 0) {
|
|
return ret;
|
|
} else if (ret) {
|
|
*pnum = pnum_inter;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* [sector_num, nb_sectors] is unallocated on top but intermediate
|
|
* might have
|
|
*
|
|
* [sector_num+x, nr_sectors] allocated.
|
|
*/
|
|
if (n > pnum_inter) {
|
|
n = pnum_inter;
|
|
}
|
|
|
|
intermediate = intermediate->backing_hd;
|
|
}
|
|
|
|
*pnum = n;
|
|
return 0;
|
|
}
|
|
|
|
BlockInfoList *qmp_query_block(Error **errp)
|
|
{
|
|
BlockInfoList *head = NULL, *cur_item = NULL;
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
BlockInfoList *info = g_malloc0(sizeof(*info));
|
|
|
|
info->value = g_malloc0(sizeof(*info->value));
|
|
info->value->device = g_strdup(bs->device_name);
|
|
info->value->type = g_strdup("unknown");
|
|
info->value->locked = bdrv_dev_is_medium_locked(bs);
|
|
info->value->removable = bdrv_dev_has_removable_media(bs);
|
|
|
|
if (bdrv_dev_has_removable_media(bs)) {
|
|
info->value->has_tray_open = true;
|
|
info->value->tray_open = bdrv_dev_is_tray_open(bs);
|
|
}
|
|
|
|
if (bdrv_iostatus_is_enabled(bs)) {
|
|
info->value->has_io_status = true;
|
|
info->value->io_status = bs->iostatus;
|
|
}
|
|
|
|
if (bs->drv) {
|
|
info->value->has_inserted = true;
|
|
info->value->inserted = g_malloc0(sizeof(*info->value->inserted));
|
|
info->value->inserted->file = g_strdup(bs->filename);
|
|
info->value->inserted->ro = bs->read_only;
|
|
info->value->inserted->drv = g_strdup(bs->drv->format_name);
|
|
info->value->inserted->encrypted = bs->encrypted;
|
|
info->value->inserted->encryption_key_missing = bdrv_key_required(bs);
|
|
if (bs->backing_file[0]) {
|
|
info->value->inserted->has_backing_file = true;
|
|
info->value->inserted->backing_file = g_strdup(bs->backing_file);
|
|
}
|
|
|
|
info->value->inserted->backing_file_depth =
|
|
bdrv_get_backing_file_depth(bs);
|
|
|
|
if (bs->io_limits_enabled) {
|
|
info->value->inserted->bps =
|
|
bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL];
|
|
info->value->inserted->bps_rd =
|
|
bs->io_limits.bps[BLOCK_IO_LIMIT_READ];
|
|
info->value->inserted->bps_wr =
|
|
bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE];
|
|
info->value->inserted->iops =
|
|
bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL];
|
|
info->value->inserted->iops_rd =
|
|
bs->io_limits.iops[BLOCK_IO_LIMIT_READ];
|
|
info->value->inserted->iops_wr =
|
|
bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE];
|
|
}
|
|
}
|
|
|
|
/* XXX: waiting for the qapi to support GSList */
|
|
if (!cur_item) {
|
|
head = cur_item = info;
|
|
} else {
|
|
cur_item->next = info;
|
|
cur_item = info;
|
|
}
|
|
}
|
|
|
|
return head;
|
|
}
|
|
|
|
/* Consider exposing this as a full fledged QMP command */
|
|
static BlockStats *qmp_query_blockstat(const BlockDriverState *bs, Error **errp)
|
|
{
|
|
BlockStats *s;
|
|
|
|
s = g_malloc0(sizeof(*s));
|
|
|
|
if (bs->device_name[0]) {
|
|
s->has_device = true;
|
|
s->device = g_strdup(bs->device_name);
|
|
}
|
|
|
|
s->stats = g_malloc0(sizeof(*s->stats));
|
|
s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ];
|
|
s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE];
|
|
s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ];
|
|
s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE];
|
|
s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE;
|
|
s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH];
|
|
s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE];
|
|
s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ];
|
|
s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH];
|
|
|
|
if (bs->file) {
|
|
s->has_parent = true;
|
|
s->parent = qmp_query_blockstat(bs->file, NULL);
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
BlockStatsList *qmp_query_blockstats(Error **errp)
|
|
{
|
|
BlockStatsList *head = NULL, *cur_item = NULL;
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
BlockStatsList *info = g_malloc0(sizeof(*info));
|
|
info->value = qmp_query_blockstat(bs, NULL);
|
|
|
|
/* XXX: waiting for the qapi to support GSList */
|
|
if (!cur_item) {
|
|
head = cur_item = info;
|
|
} else {
|
|
cur_item->next = info;
|
|
cur_item = info;
|
|
}
|
|
}
|
|
|
|
return head;
|
|
}
|
|
|
|
const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
|
|
{
|
|
if (bs->backing_hd && bs->backing_hd->encrypted)
|
|
return bs->backing_file;
|
|
else if (bs->encrypted)
|
|
return bs->filename;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
void bdrv_get_backing_filename(BlockDriverState *bs,
|
|
char *filename, int filename_size)
|
|
{
|
|
pstrcpy(filename, filename_size, bs->backing_file);
|
|
}
|
|
|
|
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
|
const uint8_t *buf, int nb_sectors)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_write_compressed)
|
|
return -ENOTSUP;
|
|
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
|
return -EIO;
|
|
|
|
if (bs->dirty_bitmap) {
|
|
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
|
}
|
|
|
|
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
|
}
|
|
|
|
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (!drv->bdrv_get_info)
|
|
return -ENOTSUP;
|
|
memset(bdi, 0, sizeof(*bdi));
|
|
return drv->bdrv_get_info(bs, bdi);
|
|
}
|
|
|
|
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
|
|
int64_t pos, int size)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_save_vmstate)
|
|
return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
|
if (bs->file)
|
|
return bdrv_save_vmstate(bs->file, buf, pos, size);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
|
int64_t pos, int size)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_load_vmstate)
|
|
return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
|
if (bs->file)
|
|
return bdrv_load_vmstate(bs->file, buf, pos, size);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (!drv || !drv->bdrv_debug_event) {
|
|
return;
|
|
}
|
|
|
|
drv->bdrv_debug_event(bs, event);
|
|
|
|
}
|
|
|
|
/**************************************************************/
|
|
/* handling of snapshots */
|
|
|
|
int bdrv_can_snapshot(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
|
|
return 0;
|
|
}
|
|
|
|
if (!drv->bdrv_snapshot_create) {
|
|
if (bs->file != NULL) {
|
|
return bdrv_can_snapshot(bs->file);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int bdrv_is_snapshot(BlockDriverState *bs)
|
|
{
|
|
return !!(bs->open_flags & BDRV_O_SNAPSHOT);
|
|
}
|
|
|
|
BlockDriverState *bdrv_snapshots(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
if (bs_snapshots) {
|
|
return bs_snapshots;
|
|
}
|
|
|
|
bs = NULL;
|
|
while ((bs = bdrv_next(bs))) {
|
|
if (bdrv_can_snapshot(bs)) {
|
|
bs_snapshots = bs;
|
|
return bs;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int bdrv_snapshot_create(BlockDriverState *bs,
|
|
QEMUSnapshotInfo *sn_info)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_snapshot_create)
|
|
return drv->bdrv_snapshot_create(bs, sn_info);
|
|
if (bs->file)
|
|
return bdrv_snapshot_create(bs->file, sn_info);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
int bdrv_snapshot_goto(BlockDriverState *bs,
|
|
const char *snapshot_id)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
int ret, open_ret;
|
|
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_snapshot_goto)
|
|
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
|
|
|
if (bs->file) {
|
|
drv->bdrv_close(bs);
|
|
ret = bdrv_snapshot_goto(bs->file, snapshot_id);
|
|
open_ret = drv->bdrv_open(bs, bs->open_flags);
|
|
if (open_ret < 0) {
|
|
bdrv_delete(bs->file);
|
|
bs->drv = NULL;
|
|
return open_ret;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_snapshot_delete)
|
|
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
|
if (bs->file)
|
|
return bdrv_snapshot_delete(bs->file, snapshot_id);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
int bdrv_snapshot_list(BlockDriverState *bs,
|
|
QEMUSnapshotInfo **psn_info)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv)
|
|
return -ENOMEDIUM;
|
|
if (drv->bdrv_snapshot_list)
|
|
return drv->bdrv_snapshot_list(bs, psn_info);
|
|
if (bs->file)
|
|
return bdrv_snapshot_list(bs->file, psn_info);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
int bdrv_snapshot_load_tmp(BlockDriverState *bs,
|
|
const char *snapshot_name)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
if (!drv) {
|
|
return -ENOMEDIUM;
|
|
}
|
|
if (!bs->read_only) {
|
|
return -EINVAL;
|
|
}
|
|
if (drv->bdrv_snapshot_load_tmp) {
|
|
return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
|
|
}
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
|
|
const char *backing_file)
|
|
{
|
|
if (!bs->drv) {
|
|
return NULL;
|
|
}
|
|
|
|
if (bs->backing_hd) {
|
|
if (strcmp(bs->backing_file, backing_file) == 0) {
|
|
return bs->backing_hd;
|
|
} else {
|
|
return bdrv_find_backing_image(bs->backing_hd, backing_file);
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int bdrv_get_backing_file_depth(BlockDriverState *bs)
|
|
{
|
|
if (!bs->drv) {
|
|
return 0;
|
|
}
|
|
|
|
if (!bs->backing_hd) {
|
|
return 0;
|
|
}
|
|
|
|
return 1 + bdrv_get_backing_file_depth(bs->backing_hd);
|
|
}
|
|
|
|
BlockDriverState *bdrv_find_base(BlockDriverState *bs)
|
|
{
|
|
BlockDriverState *curr_bs = NULL;
|
|
|
|
if (!bs) {
|
|
return NULL;
|
|
}
|
|
|
|
curr_bs = bs;
|
|
|
|
while (curr_bs->backing_hd) {
|
|
curr_bs = curr_bs->backing_hd;
|
|
}
|
|
return curr_bs;
|
|
}
|
|
|
|
#define NB_SUFFIXES 4
|
|
|
|
char *get_human_readable_size(char *buf, int buf_size, int64_t size)
|
|
{
|
|
static const char suffixes[NB_SUFFIXES] = "KMGT";
|
|
int64_t base;
|
|
int i;
|
|
|
|
if (size <= 999) {
|
|
snprintf(buf, buf_size, "%" PRId64, size);
|
|
} else {
|
|
base = 1024;
|
|
for(i = 0; i < NB_SUFFIXES; i++) {
|
|
if (size < (10 * base)) {
|
|
snprintf(buf, buf_size, "%0.1f%c",
|
|
(double)size / base,
|
|
suffixes[i]);
|
|
break;
|
|
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
|
|
snprintf(buf, buf_size, "%" PRId64 "%c",
|
|
((size + (base >> 1)) / base),
|
|
suffixes[i]);
|
|
break;
|
|
}
|
|
base = base * 1024;
|
|
}
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
|
|
{
|
|
char buf1[128], date_buf[128], clock_buf[128];
|
|
#ifdef _WIN32
|
|
struct tm *ptm;
|
|
#else
|
|
struct tm tm;
|
|
#endif
|
|
time_t ti;
|
|
int64_t secs;
|
|
|
|
if (!sn) {
|
|
snprintf(buf, buf_size,
|
|
"%-10s%-20s%7s%20s%15s",
|
|
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
|
|
} else {
|
|
ti = sn->date_sec;
|
|
#ifdef _WIN32
|
|
ptm = localtime(&ti);
|
|
strftime(date_buf, sizeof(date_buf),
|
|
"%Y-%m-%d %H:%M:%S", ptm);
|
|
#else
|
|
localtime_r(&ti, &tm);
|
|
strftime(date_buf, sizeof(date_buf),
|
|
"%Y-%m-%d %H:%M:%S", &tm);
|
|
#endif
|
|
secs = sn->vm_clock_nsec / 1000000000;
|
|
snprintf(clock_buf, sizeof(clock_buf),
|
|
"%02d:%02d:%02d.%03d",
|
|
(int)(secs / 3600),
|
|
(int)((secs / 60) % 60),
|
|
(int)(secs % 60),
|
|
(int)((sn->vm_clock_nsec / 1000000) % 1000));
|
|
snprintf(buf, buf_size,
|
|
"%-10s%-20s%7s%20s%15s",
|
|
sn->id_str, sn->name,
|
|
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
|
date_buf,
|
|
clock_buf);
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
/**************************************************************/
|
|
/* async I/Os */
|
|
|
|
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
|
|
QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque);
|
|
|
|
return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors,
|
|
cb, opaque, false);
|
|
}
|
|
|
|
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
|
|
QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
|
|
|
|
return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors,
|
|
cb, opaque, true);
|
|
}
|
|
|
|
|
|
typedef struct MultiwriteCB {
|
|
int error;
|
|
int num_requests;
|
|
int num_callbacks;
|
|
struct {
|
|
BlockDriverCompletionFunc *cb;
|
|
void *opaque;
|
|
QEMUIOVector *free_qiov;
|
|
} callbacks[];
|
|
} MultiwriteCB;
|
|
|
|
static void multiwrite_user_cb(MultiwriteCB *mcb)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < mcb->num_callbacks; i++) {
|
|
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
|
|
if (mcb->callbacks[i].free_qiov) {
|
|
qemu_iovec_destroy(mcb->callbacks[i].free_qiov);
|
|
}
|
|
g_free(mcb->callbacks[i].free_qiov);
|
|
}
|
|
}
|
|
|
|
static void multiwrite_cb(void *opaque, int ret)
|
|
{
|
|
MultiwriteCB *mcb = opaque;
|
|
|
|
trace_multiwrite_cb(mcb, ret);
|
|
|
|
if (ret < 0 && !mcb->error) {
|
|
mcb->error = ret;
|
|
}
|
|
|
|
mcb->num_requests--;
|
|
if (mcb->num_requests == 0) {
|
|
multiwrite_user_cb(mcb);
|
|
g_free(mcb);
|
|
}
|
|
}
|
|
|
|
static int multiwrite_req_compare(const void *a, const void *b)
|
|
{
|
|
const BlockRequest *req1 = a, *req2 = b;
|
|
|
|
/*
|
|
* Note that we can't simply subtract req2->sector from req1->sector
|
|
* here as that could overflow the return value.
|
|
*/
|
|
if (req1->sector > req2->sector) {
|
|
return 1;
|
|
} else if (req1->sector < req2->sector) {
|
|
return -1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Takes a bunch of requests and tries to merge them. Returns the number of
|
|
* requests that remain after merging.
|
|
*/
|
|
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
|
|
int num_reqs, MultiwriteCB *mcb)
|
|
{
|
|
int i, outidx;
|
|
|
|
// Sort requests by start sector
|
|
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
|
|
|
// Check if adjacent requests touch the same clusters. If so, combine them,
|
|
// filling up gaps with zero sectors.
|
|
outidx = 0;
|
|
for (i = 1; i < num_reqs; i++) {
|
|
int merge = 0;
|
|
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
|
|
|
|
// Handle exactly sequential writes and overlapping writes.
|
|
if (reqs[i].sector <= oldreq_last) {
|
|
merge = 1;
|
|
}
|
|
|
|
if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
|
|
merge = 0;
|
|
}
|
|
|
|
if (merge) {
|
|
size_t size;
|
|
QEMUIOVector *qiov = g_malloc0(sizeof(*qiov));
|
|
qemu_iovec_init(qiov,
|
|
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
|
|
|
// Add the first request to the merged one. If the requests are
|
|
// overlapping, drop the last sectors of the first request.
|
|
size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
|
qemu_iovec_concat(qiov, reqs[outidx].qiov, 0, size);
|
|
|
|
// We should need to add any zeros between the two requests
|
|
assert (reqs[i].sector <= oldreq_last);
|
|
|
|
// Add the second request
|
|
qemu_iovec_concat(qiov, reqs[i].qiov, 0, reqs[i].qiov->size);
|
|
|
|
reqs[outidx].nb_sectors = qiov->size >> 9;
|
|
reqs[outidx].qiov = qiov;
|
|
|
|
mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
|
|
} else {
|
|
outidx++;
|
|
reqs[outidx].sector = reqs[i].sector;
|
|
reqs[outidx].nb_sectors = reqs[i].nb_sectors;
|
|
reqs[outidx].qiov = reqs[i].qiov;
|
|
}
|
|
}
|
|
|
|
return outidx + 1;
|
|
}
|
|
|
|
/*
|
|
* Submit multiple AIO write requests at once.
|
|
*
|
|
* On success, the function returns 0 and all requests in the reqs array have
|
|
* been submitted. In error case this function returns -1, and any of the
|
|
* requests may or may not be submitted yet. In particular, this means that the
|
|
* callback will be called for some of the requests, for others it won't. The
|
|
* caller must check the error field of the BlockRequest to wait for the right
|
|
* callbacks (if error != 0, no callback will be called).
|
|
*
|
|
* The implementation may modify the contents of the reqs array, e.g. to merge
|
|
* requests. However, the fields opaque and error are left unmodified as they
|
|
* are used to signal failure for a single request to the caller.
|
|
*/
|
|
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
|
|
{
|
|
MultiwriteCB *mcb;
|
|
int i;
|
|
|
|
/* don't submit writes if we don't have a medium */
|
|
if (bs->drv == NULL) {
|
|
for (i = 0; i < num_reqs; i++) {
|
|
reqs[i].error = -ENOMEDIUM;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
if (num_reqs == 0) {
|
|
return 0;
|
|
}
|
|
|
|
// Create MultiwriteCB structure
|
|
mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
|
|
mcb->num_requests = 0;
|
|
mcb->num_callbacks = num_reqs;
|
|
|
|
for (i = 0; i < num_reqs; i++) {
|
|
mcb->callbacks[i].cb = reqs[i].cb;
|
|
mcb->callbacks[i].opaque = reqs[i].opaque;
|
|
}
|
|
|
|
// Check for mergable requests
|
|
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
|
|
|
|
trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs);
|
|
|
|
/* Run the aio requests. */
|
|
mcb->num_requests = num_reqs;
|
|
for (i = 0; i < num_reqs; i++) {
|
|
bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
|
|
reqs[i].nb_sectors, multiwrite_cb, mcb);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
|
{
|
|
acb->pool->cancel(acb);
|
|
}
|
|
|
|
/* block I/O throttling */
|
|
static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors,
|
|
bool is_write, double elapsed_time, uint64_t *wait)
|
|
{
|
|
uint64_t bps_limit = 0;
|
|
double bytes_limit, bytes_base, bytes_res;
|
|
double slice_time, wait_time;
|
|
|
|
if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) {
|
|
bps_limit = bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL];
|
|
} else if (bs->io_limits.bps[is_write]) {
|
|
bps_limit = bs->io_limits.bps[is_write];
|
|
} else {
|
|
if (wait) {
|
|
*wait = 0;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
slice_time = bs->slice_end - bs->slice_start;
|
|
slice_time /= (NANOSECONDS_PER_SECOND);
|
|
bytes_limit = bps_limit * slice_time;
|
|
bytes_base = bs->nr_bytes[is_write] - bs->io_base.bytes[is_write];
|
|
if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) {
|
|
bytes_base += bs->nr_bytes[!is_write] - bs->io_base.bytes[!is_write];
|
|
}
|
|
|
|
/* bytes_base: the bytes of data which have been read/written; and
|
|
* it is obtained from the history statistic info.
|
|
* bytes_res: the remaining bytes of data which need to be read/written.
|
|
* (bytes_base + bytes_res) / bps_limit: used to calcuate
|
|
* the total time for completing reading/writting all data.
|
|
*/
|
|
bytes_res = (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
|
|
|
if (bytes_base + bytes_res <= bytes_limit) {
|
|
if (wait) {
|
|
*wait = 0;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Calc approx time to dispatch */
|
|
wait_time = (bytes_base + bytes_res) / bps_limit - elapsed_time;
|
|
|
|
/* When the I/O rate at runtime exceeds the limits,
|
|
* bs->slice_end need to be extended in order that the current statistic
|
|
* info can be kept until the timer fire, so it is increased and tuned
|
|
* based on the result of experiment.
|
|
*/
|
|
bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
|
bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME;
|
|
if (wait) {
|
|
*wait = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write,
|
|
double elapsed_time, uint64_t *wait)
|
|
{
|
|
uint64_t iops_limit = 0;
|
|
double ios_limit, ios_base;
|
|
double slice_time, wait_time;
|
|
|
|
if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) {
|
|
iops_limit = bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL];
|
|
} else if (bs->io_limits.iops[is_write]) {
|
|
iops_limit = bs->io_limits.iops[is_write];
|
|
} else {
|
|
if (wait) {
|
|
*wait = 0;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
slice_time = bs->slice_end - bs->slice_start;
|
|
slice_time /= (NANOSECONDS_PER_SECOND);
|
|
ios_limit = iops_limit * slice_time;
|
|
ios_base = bs->nr_ops[is_write] - bs->io_base.ios[is_write];
|
|
if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) {
|
|
ios_base += bs->nr_ops[!is_write] - bs->io_base.ios[!is_write];
|
|
}
|
|
|
|
if (ios_base + 1 <= ios_limit) {
|
|
if (wait) {
|
|
*wait = 0;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Calc approx time to dispatch */
|
|
wait_time = (ios_base + 1) / iops_limit;
|
|
if (wait_time > elapsed_time) {
|
|
wait_time = wait_time - elapsed_time;
|
|
} else {
|
|
wait_time = 0;
|
|
}
|
|
|
|
bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
|
bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME;
|
|
if (wait) {
|
|
*wait = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors,
|
|
bool is_write, int64_t *wait)
|
|
{
|
|
int64_t now, max_wait;
|
|
uint64_t bps_wait = 0, iops_wait = 0;
|
|
double elapsed_time;
|
|
int bps_ret, iops_ret;
|
|
|
|
now = qemu_get_clock_ns(vm_clock);
|
|
if ((bs->slice_start < now)
|
|
&& (bs->slice_end > now)) {
|
|
bs->slice_end = now + bs->slice_time;
|
|
} else {
|
|
bs->slice_time = 5 * BLOCK_IO_SLICE_TIME;
|
|
bs->slice_start = now;
|
|
bs->slice_end = now + bs->slice_time;
|
|
|
|
bs->io_base.bytes[is_write] = bs->nr_bytes[is_write];
|
|
bs->io_base.bytes[!is_write] = bs->nr_bytes[!is_write];
|
|
|
|
bs->io_base.ios[is_write] = bs->nr_ops[is_write];
|
|
bs->io_base.ios[!is_write] = bs->nr_ops[!is_write];
|
|
}
|
|
|
|
elapsed_time = now - bs->slice_start;
|
|
elapsed_time /= (NANOSECONDS_PER_SECOND);
|
|
|
|
bps_ret = bdrv_exceed_bps_limits(bs, nb_sectors,
|
|
is_write, elapsed_time, &bps_wait);
|
|
iops_ret = bdrv_exceed_iops_limits(bs, is_write,
|
|
elapsed_time, &iops_wait);
|
|
if (bps_ret || iops_ret) {
|
|
max_wait = bps_wait > iops_wait ? bps_wait : iops_wait;
|
|
if (wait) {
|
|
*wait = max_wait;
|
|
}
|
|
|
|
now = qemu_get_clock_ns(vm_clock);
|
|
if (bs->slice_end < now + max_wait) {
|
|
bs->slice_end = now + max_wait;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
if (wait) {
|
|
*wait = 0;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**************************************************************/
|
|
/* async block device emulation */
|
|
|
|
typedef struct BlockDriverAIOCBSync {
|
|
BlockDriverAIOCB common;
|
|
QEMUBH *bh;
|
|
int ret;
|
|
/* vector translation state */
|
|
QEMUIOVector *qiov;
|
|
uint8_t *bounce;
|
|
int is_write;
|
|
} BlockDriverAIOCBSync;
|
|
|
|
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
|
|
{
|
|
BlockDriverAIOCBSync *acb =
|
|
container_of(blockacb, BlockDriverAIOCBSync, common);
|
|
qemu_bh_delete(acb->bh);
|
|
acb->bh = NULL;
|
|
qemu_aio_release(acb);
|
|
}
|
|
|
|
static AIOPool bdrv_em_aio_pool = {
|
|
.aiocb_size = sizeof(BlockDriverAIOCBSync),
|
|
.cancel = bdrv_aio_cancel_em,
|
|
};
|
|
|
|
static void bdrv_aio_bh_cb(void *opaque)
|
|
{
|
|
BlockDriverAIOCBSync *acb = opaque;
|
|
|
|
if (!acb->is_write)
|
|
qemu_iovec_from_buf(acb->qiov, 0, acb->bounce, acb->qiov->size);
|
|
qemu_vfree(acb->bounce);
|
|
acb->common.cb(acb->common.opaque, acb->ret);
|
|
qemu_bh_delete(acb->bh);
|
|
acb->bh = NULL;
|
|
qemu_aio_release(acb);
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
QEMUIOVector *qiov,
|
|
int nb_sectors,
|
|
BlockDriverCompletionFunc *cb,
|
|
void *opaque,
|
|
int is_write)
|
|
|
|
{
|
|
BlockDriverAIOCBSync *acb;
|
|
|
|
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
|
|
acb->is_write = is_write;
|
|
acb->qiov = qiov;
|
|
acb->bounce = qemu_blockalign(bs, qiov->size);
|
|
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
|
|
|
|
if (is_write) {
|
|
qemu_iovec_to_buf(acb->qiov, 0, acb->bounce, qiov->size);
|
|
acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
|
|
} else {
|
|
acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
|
|
}
|
|
|
|
qemu_bh_schedule(acb->bh);
|
|
|
|
return &acb->common;
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
|
|
}
|
|
|
|
|
|
typedef struct BlockDriverAIOCBCoroutine {
|
|
BlockDriverAIOCB common;
|
|
BlockRequest req;
|
|
bool is_write;
|
|
QEMUBH* bh;
|
|
} BlockDriverAIOCBCoroutine;
|
|
|
|
static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb)
|
|
{
|
|
qemu_aio_flush();
|
|
}
|
|
|
|
static AIOPool bdrv_em_co_aio_pool = {
|
|
.aiocb_size = sizeof(BlockDriverAIOCBCoroutine),
|
|
.cancel = bdrv_aio_co_cancel_em,
|
|
};
|
|
|
|
static void bdrv_co_em_bh(void *opaque)
|
|
{
|
|
BlockDriverAIOCBCoroutine *acb = opaque;
|
|
|
|
acb->common.cb(acb->common.opaque, acb->req.error);
|
|
qemu_bh_delete(acb->bh);
|
|
qemu_aio_release(acb);
|
|
}
|
|
|
|
/* Invoke bdrv_co_do_readv/bdrv_co_do_writev */
|
|
static void coroutine_fn bdrv_co_do_rw(void *opaque)
|
|
{
|
|
BlockDriverAIOCBCoroutine *acb = opaque;
|
|
BlockDriverState *bs = acb->common.bs;
|
|
|
|
if (!acb->is_write) {
|
|
acb->req.error = bdrv_co_do_readv(bs, acb->req.sector,
|
|
acb->req.nb_sectors, acb->req.qiov, 0);
|
|
} else {
|
|
acb->req.error = bdrv_co_do_writev(bs, acb->req.sector,
|
|
acb->req.nb_sectors, acb->req.qiov, 0);
|
|
}
|
|
|
|
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb);
|
|
qemu_bh_schedule(acb->bh);
|
|
}
|
|
|
|
static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs,
|
|
int64_t sector_num,
|
|
QEMUIOVector *qiov,
|
|
int nb_sectors,
|
|
BlockDriverCompletionFunc *cb,
|
|
void *opaque,
|
|
bool is_write)
|
|
{
|
|
Coroutine *co;
|
|
BlockDriverAIOCBCoroutine *acb;
|
|
|
|
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque);
|
|
acb->req.sector = sector_num;
|
|
acb->req.nb_sectors = nb_sectors;
|
|
acb->req.qiov = qiov;
|
|
acb->is_write = is_write;
|
|
|
|
co = qemu_coroutine_create(bdrv_co_do_rw);
|
|
qemu_coroutine_enter(co, acb);
|
|
|
|
return &acb->common;
|
|
}
|
|
|
|
static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque)
|
|
{
|
|
BlockDriverAIOCBCoroutine *acb = opaque;
|
|
BlockDriverState *bs = acb->common.bs;
|
|
|
|
acb->req.error = bdrv_co_flush(bs);
|
|
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb);
|
|
qemu_bh_schedule(acb->bh);
|
|
}
|
|
|
|
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
trace_bdrv_aio_flush(bs, opaque);
|
|
|
|
Coroutine *co;
|
|
BlockDriverAIOCBCoroutine *acb;
|
|
|
|
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque);
|
|
co = qemu_coroutine_create(bdrv_aio_flush_co_entry);
|
|
qemu_coroutine_enter(co, acb);
|
|
|
|
return &acb->common;
|
|
}
|
|
|
|
static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque)
|
|
{
|
|
BlockDriverAIOCBCoroutine *acb = opaque;
|
|
BlockDriverState *bs = acb->common.bs;
|
|
|
|
acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors);
|
|
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb);
|
|
qemu_bh_schedule(acb->bh);
|
|
}
|
|
|
|
BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
Coroutine *co;
|
|
BlockDriverAIOCBCoroutine *acb;
|
|
|
|
trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque);
|
|
|
|
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque);
|
|
acb->req.sector = sector_num;
|
|
acb->req.nb_sectors = nb_sectors;
|
|
co = qemu_coroutine_create(bdrv_aio_discard_co_entry);
|
|
qemu_coroutine_enter(co, acb);
|
|
|
|
return &acb->common;
|
|
}
|
|
|
|
void bdrv_init(void)
|
|
{
|
|
module_call_init(MODULE_INIT_BLOCK);
|
|
}
|
|
|
|
void bdrv_init_with_whitelist(void)
|
|
{
|
|
use_bdrv_whitelist = 1;
|
|
bdrv_init();
|
|
}
|
|
|
|
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriverAIOCB *acb;
|
|
|
|
if (pool->free_aiocb) {
|
|
acb = pool->free_aiocb;
|
|
pool->free_aiocb = acb->next;
|
|
} else {
|
|
acb = g_malloc0(pool->aiocb_size);
|
|
acb->pool = pool;
|
|
}
|
|
acb->bs = bs;
|
|
acb->cb = cb;
|
|
acb->opaque = opaque;
|
|
return acb;
|
|
}
|
|
|
|
void qemu_aio_release(void *p)
|
|
{
|
|
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
|
|
AIOPool *pool = acb->pool;
|
|
acb->next = pool->free_aiocb;
|
|
pool->free_aiocb = acb;
|
|
}
|
|
|
|
/**************************************************************/
|
|
/* Coroutine block device emulation */
|
|
|
|
typedef struct CoroutineIOCompletion {
|
|
Coroutine *coroutine;
|
|
int ret;
|
|
} CoroutineIOCompletion;
|
|
|
|
static void bdrv_co_io_em_complete(void *opaque, int ret)
|
|
{
|
|
CoroutineIOCompletion *co = opaque;
|
|
|
|
co->ret = ret;
|
|
qemu_coroutine_enter(co->coroutine, NULL);
|
|
}
|
|
|
|
static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors, QEMUIOVector *iov,
|
|
bool is_write)
|
|
{
|
|
CoroutineIOCompletion co = {
|
|
.coroutine = qemu_coroutine_self(),
|
|
};
|
|
BlockDriverAIOCB *acb;
|
|
|
|
if (is_write) {
|
|
acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors,
|
|
bdrv_co_io_em_complete, &co);
|
|
} else {
|
|
acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors,
|
|
bdrv_co_io_em_complete, &co);
|
|
}
|
|
|
|
trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb);
|
|
if (!acb) {
|
|
return -EIO;
|
|
}
|
|
qemu_coroutine_yield();
|
|
|
|
return co.ret;
|
|
}
|
|
|
|
static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors,
|
|
QEMUIOVector *iov)
|
|
{
|
|
return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false);
|
|
}
|
|
|
|
static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors,
|
|
QEMUIOVector *iov)
|
|
{
|
|
return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true);
|
|
}
|
|
|
|
static void coroutine_fn bdrv_flush_co_entry(void *opaque)
|
|
{
|
|
RwCo *rwco = opaque;
|
|
|
|
rwco->ret = bdrv_co_flush(rwco->bs);
|
|
}
|
|
|
|
int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
|
|
{
|
|
int ret;
|
|
|
|
if (!bs || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
|
|
return 0;
|
|
}
|
|
|
|
/* Write back cached data to the OS even with cache=unsafe */
|
|
if (bs->drv->bdrv_co_flush_to_os) {
|
|
ret = bs->drv->bdrv_co_flush_to_os(bs);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* But don't actually force it to the disk with cache=unsafe */
|
|
if (bs->open_flags & BDRV_O_NO_FLUSH) {
|
|
goto flush_parent;
|
|
}
|
|
|
|
if (bs->drv->bdrv_co_flush_to_disk) {
|
|
ret = bs->drv->bdrv_co_flush_to_disk(bs);
|
|
} else if (bs->drv->bdrv_aio_flush) {
|
|
BlockDriverAIOCB *acb;
|
|
CoroutineIOCompletion co = {
|
|
.coroutine = qemu_coroutine_self(),
|
|
};
|
|
|
|
acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co);
|
|
if (acb == NULL) {
|
|
ret = -EIO;
|
|
} else {
|
|
qemu_coroutine_yield();
|
|
ret = co.ret;
|
|
}
|
|
} else {
|
|
/*
|
|
* Some block drivers always operate in either writethrough or unsafe
|
|
* mode and don't support bdrv_flush therefore. Usually qemu doesn't
|
|
* know how the server works (because the behaviour is hardcoded or
|
|
* depends on server-side configuration), so we can't ensure that
|
|
* everything is safe on disk. Returning an error doesn't work because
|
|
* that would break guests even if the server operates in writethrough
|
|
* mode.
|
|
*
|
|
* Let's hope the user knows what he's doing.
|
|
*/
|
|
ret = 0;
|
|
}
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
|
|
/* Now flush the underlying protocol. It will also have BDRV_O_NO_FLUSH
|
|
* in the case of cache=unsafe, so there are no useless flushes.
|
|
*/
|
|
flush_parent:
|
|
return bdrv_co_flush(bs->file);
|
|
}
|
|
|
|
void bdrv_invalidate_cache(BlockDriverState *bs)
|
|
{
|
|
if (bs->drv && bs->drv->bdrv_invalidate_cache) {
|
|
bs->drv->bdrv_invalidate_cache(bs);
|
|
}
|
|
}
|
|
|
|
void bdrv_invalidate_cache_all(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
bdrv_invalidate_cache(bs);
|
|
}
|
|
}
|
|
|
|
void bdrv_clear_incoming_migration_all(void)
|
|
{
|
|
BlockDriverState *bs;
|
|
|
|
QTAILQ_FOREACH(bs, &bdrv_states, list) {
|
|
bs->open_flags = bs->open_flags & ~(BDRV_O_INCOMING);
|
|
}
|
|
}
|
|
|
|
int bdrv_flush(BlockDriverState *bs)
|
|
{
|
|
Coroutine *co;
|
|
RwCo rwco = {
|
|
.bs = bs,
|
|
.ret = NOT_DONE,
|
|
};
|
|
|
|
if (qemu_in_coroutine()) {
|
|
/* Fast-path if already in coroutine context */
|
|
bdrv_flush_co_entry(&rwco);
|
|
} else {
|
|
co = qemu_coroutine_create(bdrv_flush_co_entry);
|
|
qemu_coroutine_enter(co, &rwco);
|
|
while (rwco.ret == NOT_DONE) {
|
|
qemu_aio_wait();
|
|
}
|
|
}
|
|
|
|
return rwco.ret;
|
|
}
|
|
|
|
static void coroutine_fn bdrv_discard_co_entry(void *opaque)
|
|
{
|
|
RwCo *rwco = opaque;
|
|
|
|
rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors);
|
|
}
|
|
|
|
int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num,
|
|
int nb_sectors)
|
|
{
|
|
if (!bs->drv) {
|
|
return -ENOMEDIUM;
|
|
} else if (bdrv_check_request(bs, sector_num, nb_sectors)) {
|
|
return -EIO;
|
|
} else if (bs->read_only) {
|
|
return -EROFS;
|
|
} else if (bs->drv->bdrv_co_discard) {
|
|
return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors);
|
|
} else if (bs->drv->bdrv_aio_discard) {
|
|
BlockDriverAIOCB *acb;
|
|
CoroutineIOCompletion co = {
|
|
.coroutine = qemu_coroutine_self(),
|
|
};
|
|
|
|
acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors,
|
|
bdrv_co_io_em_complete, &co);
|
|
if (acb == NULL) {
|
|
return -EIO;
|
|
} else {
|
|
qemu_coroutine_yield();
|
|
return co.ret;
|
|
}
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
|
|
{
|
|
Coroutine *co;
|
|
RwCo rwco = {
|
|
.bs = bs,
|
|
.sector_num = sector_num,
|
|
.nb_sectors = nb_sectors,
|
|
.ret = NOT_DONE,
|
|
};
|
|
|
|
if (qemu_in_coroutine()) {
|
|
/* Fast-path if already in coroutine context */
|
|
bdrv_discard_co_entry(&rwco);
|
|
} else {
|
|
co = qemu_coroutine_create(bdrv_discard_co_entry);
|
|
qemu_coroutine_enter(co, &rwco);
|
|
while (rwco.ret == NOT_DONE) {
|
|
qemu_aio_wait();
|
|
}
|
|
}
|
|
|
|
return rwco.ret;
|
|
}
|
|
|
|
/**************************************************************/
|
|
/* removable device support */
|
|
|
|
/**
|
|
* Return TRUE if the media is present
|
|
*/
|
|
int bdrv_is_inserted(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
if (!drv->bdrv_is_inserted)
|
|
return 1;
|
|
return drv->bdrv_is_inserted(bs);
|
|
}
|
|
|
|
/**
|
|
* Return whether the media changed since the last call to this
|
|
* function, or -ENOTSUP if we don't know. Most drivers don't know.
|
|
*/
|
|
int bdrv_media_changed(BlockDriverState *bs)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (drv && drv->bdrv_media_changed) {
|
|
return drv->bdrv_media_changed(bs);
|
|
}
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
/**
|
|
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
|
*/
|
|
void bdrv_eject(BlockDriverState *bs, bool eject_flag)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (drv && drv->bdrv_eject) {
|
|
drv->bdrv_eject(bs, eject_flag);
|
|
}
|
|
|
|
if (bs->device_name[0] != '\0') {
|
|
bdrv_emit_qmp_eject_event(bs, eject_flag);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Lock or unlock the media (if it is locked, the user won't be able
|
|
* to eject it manually).
|
|
*/
|
|
void bdrv_lock_medium(BlockDriverState *bs, bool locked)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
trace_bdrv_lock_medium(bs, locked);
|
|
|
|
if (drv && drv->bdrv_lock_medium) {
|
|
drv->bdrv_lock_medium(bs, locked);
|
|
}
|
|
}
|
|
|
|
/* needed for generic scsi interface */
|
|
|
|
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (drv && drv->bdrv_ioctl)
|
|
return drv->bdrv_ioctl(bs, req, buf);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
|
|
unsigned long int req, void *buf,
|
|
BlockDriverCompletionFunc *cb, void *opaque)
|
|
{
|
|
BlockDriver *drv = bs->drv;
|
|
|
|
if (drv && drv->bdrv_aio_ioctl)
|
|
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
|
return NULL;
|
|
}
|
|
|
|
void bdrv_set_buffer_alignment(BlockDriverState *bs, int align)
|
|
{
|
|
bs->buffer_alignment = align;
|
|
}
|
|
|
|
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
|
{
|
|
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
|
|
}
|
|
|
|
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
|
|
{
|
|
int64_t bitmap_size;
|
|
|
|
bs->dirty_count = 0;
|
|
if (enable) {
|
|
if (!bs->dirty_bitmap) {
|
|
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
|
|
BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG - 1;
|
|
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * BITS_PER_LONG;
|
|
|
|
bs->dirty_bitmap = g_new0(unsigned long, bitmap_size);
|
|
}
|
|
} else {
|
|
if (bs->dirty_bitmap) {
|
|
g_free(bs->dirty_bitmap);
|
|
bs->dirty_bitmap = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
|
|
{
|
|
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
|
|
|
|
if (bs->dirty_bitmap &&
|
|
(sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
|
|
return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
|
|
(1UL << (chunk % (sizeof(unsigned long) * 8))));
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
|
|
int nr_sectors)
|
|
{
|
|
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
|
|
}
|
|
|
|
int64_t bdrv_get_dirty_count(BlockDriverState *bs)
|
|
{
|
|
return bs->dirty_count;
|
|
}
|
|
|
|
void bdrv_set_in_use(BlockDriverState *bs, int in_use)
|
|
{
|
|
assert(bs->in_use != in_use);
|
|
bs->in_use = in_use;
|
|
}
|
|
|
|
int bdrv_in_use(BlockDriverState *bs)
|
|
{
|
|
return bs->in_use;
|
|
}
|
|
|
|
void bdrv_iostatus_enable(BlockDriverState *bs)
|
|
{
|
|
bs->iostatus_enabled = true;
|
|
bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
|
|
}
|
|
|
|
/* The I/O status is only enabled if the drive explicitly
|
|
* enables it _and_ the VM is configured to stop on errors */
|
|
bool bdrv_iostatus_is_enabled(const BlockDriverState *bs)
|
|
{
|
|
return (bs->iostatus_enabled &&
|
|
(bs->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC ||
|
|
bs->on_write_error == BLOCKDEV_ON_ERROR_STOP ||
|
|
bs->on_read_error == BLOCKDEV_ON_ERROR_STOP));
|
|
}
|
|
|
|
void bdrv_iostatus_disable(BlockDriverState *bs)
|
|
{
|
|
bs->iostatus_enabled = false;
|
|
}
|
|
|
|
void bdrv_iostatus_reset(BlockDriverState *bs)
|
|
{
|
|
if (bdrv_iostatus_is_enabled(bs)) {
|
|
bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
|
|
}
|
|
}
|
|
|
|
void bdrv_iostatus_set_err(BlockDriverState *bs, int error)
|
|
{
|
|
assert(bdrv_iostatus_is_enabled(bs));
|
|
if (bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
|
|
bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
|
|
BLOCK_DEVICE_IO_STATUS_FAILED;
|
|
}
|
|
}
|
|
|
|
void
|
|
bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes,
|
|
enum BlockAcctType type)
|
|
{
|
|
assert(type < BDRV_MAX_IOTYPE);
|
|
|
|
cookie->bytes = bytes;
|
|
cookie->start_time_ns = get_clock();
|
|
cookie->type = type;
|
|
}
|
|
|
|
void
|
|
bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie)
|
|
{
|
|
assert(cookie->type < BDRV_MAX_IOTYPE);
|
|
|
|
bs->nr_bytes[cookie->type] += cookie->bytes;
|
|
bs->nr_ops[cookie->type]++;
|
|
bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns;
|
|
}
|
|
|
|
int bdrv_img_create(const char *filename, const char *fmt,
|
|
const char *base_filename, const char *base_fmt,
|
|
char *options, uint64_t img_size, int flags)
|
|
{
|
|
QEMUOptionParameter *param = NULL, *create_options = NULL;
|
|
QEMUOptionParameter *backing_fmt, *backing_file, *size;
|
|
BlockDriverState *bs = NULL;
|
|
BlockDriver *drv, *proto_drv;
|
|
BlockDriver *backing_drv = NULL;
|
|
int ret = 0;
|
|
|
|
/* Find driver and parse its options */
|
|
drv = bdrv_find_format(fmt);
|
|
if (!drv) {
|
|
error_report("Unknown file format '%s'", fmt);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
proto_drv = bdrv_find_protocol(filename);
|
|
if (!proto_drv) {
|
|
error_report("Unknown protocol '%s'", filename);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
create_options = append_option_parameters(create_options,
|
|
drv->create_options);
|
|
create_options = append_option_parameters(create_options,
|
|
proto_drv->create_options);
|
|
|
|
/* Create parameter list with default values */
|
|
param = parse_option_parameters("", create_options, param);
|
|
|
|
set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size);
|
|
|
|
/* Parse -o options */
|
|
if (options) {
|
|
param = parse_option_parameters(options, create_options, param);
|
|
if (param == NULL) {
|
|
error_report("Invalid options for file format '%s'.", fmt);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (base_filename) {
|
|
if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE,
|
|
base_filename)) {
|
|
error_report("Backing file not supported for file format '%s'",
|
|
fmt);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (base_fmt) {
|
|
if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) {
|
|
error_report("Backing file format not supported for file "
|
|
"format '%s'", fmt);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
|
|
if (backing_file && backing_file->value.s) {
|
|
if (!strcmp(filename, backing_file->value.s)) {
|
|
error_report("Error: Trying to create an image with the "
|
|
"same filename as the backing file");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT);
|
|
if (backing_fmt && backing_fmt->value.s) {
|
|
backing_drv = bdrv_find_format(backing_fmt->value.s);
|
|
if (!backing_drv) {
|
|
error_report("Unknown backing file format '%s'",
|
|
backing_fmt->value.s);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
// The size for the image must always be specified, with one exception:
|
|
// If we are using a backing file, we can obtain the size from there
|
|
size = get_option_parameter(param, BLOCK_OPT_SIZE);
|
|
if (size && size->value.n == -1) {
|
|
if (backing_file && backing_file->value.s) {
|
|
uint64_t size;
|
|
char buf[32];
|
|
int back_flags;
|
|
|
|
/* backing files always opened read-only */
|
|
back_flags =
|
|
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
|
|
|
|
bs = bdrv_new("");
|
|
|
|
ret = bdrv_open(bs, backing_file->value.s, back_flags, backing_drv);
|
|
if (ret < 0) {
|
|
error_report("Could not open '%s'", backing_file->value.s);
|
|
goto out;
|
|
}
|
|
bdrv_get_geometry(bs, &size);
|
|
size *= 512;
|
|
|
|
snprintf(buf, sizeof(buf), "%" PRId64, size);
|
|
set_option_parameter(param, BLOCK_OPT_SIZE, buf);
|
|
} else {
|
|
error_report("Image creation needs a size parameter");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
printf("Formatting '%s', fmt=%s ", filename, fmt);
|
|
print_option_parameters(param);
|
|
puts("");
|
|
|
|
ret = bdrv_create(drv, filename, param);
|
|
|
|
if (ret < 0) {
|
|
if (ret == -ENOTSUP) {
|
|
error_report("Formatting or formatting option not supported for "
|
|
"file format '%s'", fmt);
|
|
} else if (ret == -EFBIG) {
|
|
error_report("The image size is too large for file format '%s'",
|
|
fmt);
|
|
} else {
|
|
error_report("%s: error while creating %s: %s", filename, fmt,
|
|
strerror(-ret));
|
|
}
|
|
}
|
|
|
|
out:
|
|
free_option_parameters(create_options);
|
|
free_option_parameters(param);
|
|
|
|
if (bs) {
|
|
bdrv_delete(bs);
|
|
}
|
|
|
|
return ret;
|
|
}
|