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/*
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config-host.h" |
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#include "qemu-common.h" |
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#include "trace.h" |
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#include "monitor.h" |
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#include "block_int.h" |
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#include "module.h" |
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#include "qjson.h" |
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#include "qemu-coroutine.h" |
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#include "qmp-commands.h" |
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#include "qemu-timer.h" |
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|
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#ifdef CONFIG_BSD
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <sys/ioctl.h> |
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#include <sys/queue.h> |
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#ifndef __DragonFly__
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#include <sys/disk.h> |
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#endif
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#endif
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|
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#ifdef _WIN32
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#include <windows.h> |
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#endif
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|
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#define NOT_DONE 0x7fffffff /* used while emulated sync operation in progress */ |
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|
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typedef enum { |
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BDRV_REQ_COPY_ON_READ = 0x1,
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BDRV_REQ_ZERO_WRITE = 0x2,
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} BdrvRequestFlags; |
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|
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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 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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|
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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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#ifdef _WIN32
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if (is_windows_drive(path) ||
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is_windows_drive_prefix(path)) { |
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return 0; |
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} |
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#endif
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return strchr(path, ':') != NULL; |
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} |
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int path_is_absolute(const char *path) |
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{ |
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const char *p; |
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#ifdef _WIN32
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/* specific case for names like: "\\.\d:" */
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if (*path == '/' || *path == '\\') |
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return 1; |
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#endif
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p = strchr(path, ':');
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if (p)
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p++; |
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else
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p = path; |
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#ifdef _WIN32
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return (*p == '/' || *p == '\\'); |
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#else
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return (*p == '/'); |
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#endif
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} |
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/* if filename is absolute, just copy it to dest. Otherwise, build a
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path to it by considering it is relative to base_path. URL are
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supported. */
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void path_combine(char *dest, int dest_size, |
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const char *base_path, |
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const char *filename) |
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{ |
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const char *p, *p1; |
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int len;
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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_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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|
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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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|
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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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} |
317 |
|
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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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|
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if (!whitelist[0]) |
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return 1; /* no whitelist, anything goes */ |
327 |
|
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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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} |
335 |
|
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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; |
340 |
} |
341 |
|
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int bdrv_create(BlockDriver *drv, const char* filename, |
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QEMUOptionParameter *options) |
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{ |
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if (!drv->bdrv_create)
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return -ENOTSUP;
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|
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return drv->bdrv_create(filename, options);
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} |
350 |
|
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int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
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{ |
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BlockDriver *drv; |
354 |
|
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drv = bdrv_find_protocol(filename); |
356 |
if (drv == NULL) { |
357 |
return -ENOENT;
|
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} |
359 |
|
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return bdrv_create(drv, filename, options);
|
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} |
362 |
|
363 |
#ifdef _WIN32
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364 |
void get_tmp_filename(char *filename, int size) |
365 |
{ |
366 |
char temp_dir[MAX_PATH];
|
367 |
|
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GetTempPath(MAX_PATH, temp_dir); |
369 |
GetTempFileName(temp_dir, "qem", 0, filename); |
370 |
} |
371 |
#else
|
372 |
void get_tmp_filename(char *filename, int size) |
373 |
{ |
374 |
int fd;
|
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const char *tmpdir; |
376 |
/* XXX: race condition possible */
|
377 |
tmpdir = getenv("TMPDIR");
|
378 |
if (!tmpdir)
|
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tmpdir = "/tmp";
|
380 |
snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
|
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fd = mkstemp(filename); |
382 |
close(fd); |
383 |
} |
384 |
#endif
|
385 |
|
386 |
/*
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* Detect host devices. By convention, /dev/cdrom[N] is always
|
388 |
* recognized as a host CDROM.
|
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*/
|
390 |
static BlockDriver *find_hdev_driver(const char *filename) |
391 |
{ |
392 |
int score_max = 0, score; |
393 |
BlockDriver *drv = NULL, *d;
|
394 |
|
395 |
QLIST_FOREACH(d, &bdrv_drivers, list) { |
396 |
if (d->bdrv_probe_device) {
|
397 |
score = d->bdrv_probe_device(filename); |
398 |
if (score > score_max) {
|
399 |
score_max = score; |
400 |
drv = d; |
401 |
} |
402 |
} |
403 |
} |
404 |
|
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return drv;
|
406 |
} |
407 |
|
408 |
BlockDriver *bdrv_find_protocol(const char *filename) |
409 |
{ |
410 |
BlockDriver *drv1; |
411 |
char protocol[128]; |
412 |
int len;
|
413 |
const char *p; |
414 |
|
415 |
/* TODO Drivers without bdrv_file_open must be specified explicitly */
|
416 |
|
417 |
/*
|
418 |
* XXX(hch): we really should not let host device detection
|
419 |
* override an explicit protocol specification, but moving this
|
420 |
* later breaks access to device names with colons in them.
|
421 |
* Thanks to the brain-dead persistent naming schemes on udev-
|
422 |
* based Linux systems those actually are quite common.
|
423 |
*/
|
424 |
drv1 = find_hdev_driver(filename); |
425 |
if (drv1) {
|
426 |
return drv1;
|
427 |
} |
428 |
|
429 |
if (!path_has_protocol(filename)) {
|
430 |
return bdrv_find_format("file"); |
431 |
} |
432 |
p = strchr(filename, ':');
|
433 |
assert(p != NULL);
|
434 |
len = p - filename; |
435 |
if (len > sizeof(protocol) - 1) |
436 |
len = sizeof(protocol) - 1; |
437 |
memcpy(protocol, filename, len); |
438 |
protocol[len] = '\0';
|
439 |
QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
440 |
if (drv1->protocol_name &&
|
441 |
!strcmp(drv1->protocol_name, protocol)) { |
442 |
return drv1;
|
443 |
} |
444 |
} |
445 |
return NULL; |
446 |
} |
447 |
|
448 |
static int find_image_format(const char *filename, BlockDriver **pdrv) |
449 |
{ |
450 |
int ret, score, score_max;
|
451 |
BlockDriver *drv1, *drv; |
452 |
uint8_t buf[2048];
|
453 |
BlockDriverState *bs; |
454 |
|
455 |
ret = bdrv_file_open(&bs, filename, 0);
|
456 |
if (ret < 0) { |
457 |
*pdrv = NULL;
|
458 |
return ret;
|
459 |
} |
460 |
|
461 |
/* Return the raw BlockDriver * to scsi-generic devices or empty drives */
|
462 |
if (bs->sg || !bdrv_is_inserted(bs)) {
|
463 |
bdrv_delete(bs); |
464 |
drv = bdrv_find_format("raw");
|
465 |
if (!drv) {
|
466 |
ret = -ENOENT; |
467 |
} |
468 |
*pdrv = drv; |
469 |
return ret;
|
470 |
} |
471 |
|
472 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
473 |
bdrv_delete(bs); |
474 |
if (ret < 0) { |
475 |
*pdrv = NULL;
|
476 |
return ret;
|
477 |
} |
478 |
|
479 |
score_max = 0;
|
480 |
drv = NULL;
|
481 |
QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
482 |
if (drv1->bdrv_probe) {
|
483 |
score = drv1->bdrv_probe(buf, ret, filename); |
484 |
if (score > score_max) {
|
485 |
score_max = score; |
486 |
drv = drv1; |
487 |
} |
488 |
} |
489 |
} |
490 |
if (!drv) {
|
491 |
ret = -ENOENT; |
492 |
} |
493 |
*pdrv = drv; |
494 |
return ret;
|
495 |
} |
496 |
|
497 |
/**
|
498 |
* Set the current 'total_sectors' value
|
499 |
*/
|
500 |
static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
501 |
{ |
502 |
BlockDriver *drv = bs->drv; |
503 |
|
504 |
/* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
|
505 |
if (bs->sg)
|
506 |
return 0; |
507 |
|
508 |
/* query actual device if possible, otherwise just trust the hint */
|
509 |
if (drv->bdrv_getlength) {
|
510 |
int64_t length = drv->bdrv_getlength(bs); |
511 |
if (length < 0) { |
512 |
return length;
|
513 |
} |
514 |
hint = length >> BDRV_SECTOR_BITS; |
515 |
} |
516 |
|
517 |
bs->total_sectors = hint; |
518 |
return 0; |
519 |
} |
520 |
|
521 |
/**
|
522 |
* Set open flags for a given cache mode
|
523 |
*
|
524 |
* Return 0 on success, -1 if the cache mode was invalid.
|
525 |
*/
|
526 |
int bdrv_parse_cache_flags(const char *mode, int *flags) |
527 |
{ |
528 |
*flags &= ~BDRV_O_CACHE_MASK; |
529 |
|
530 |
if (!strcmp(mode, "off") || !strcmp(mode, "none")) { |
531 |
*flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; |
532 |
} else if (!strcmp(mode, "directsync")) { |
533 |
*flags |= BDRV_O_NOCACHE; |
534 |
} else if (!strcmp(mode, "writeback")) { |
535 |
*flags |= BDRV_O_CACHE_WB; |
536 |
} else if (!strcmp(mode, "unsafe")) { |
537 |
*flags |= BDRV_O_CACHE_WB; |
538 |
*flags |= BDRV_O_NO_FLUSH; |
539 |
} else if (!strcmp(mode, "writethrough")) { |
540 |
/* this is the default */
|
541 |
} else {
|
542 |
return -1; |
543 |
} |
544 |
|
545 |
return 0; |
546 |
} |
547 |
|
548 |
/**
|
549 |
* The copy-on-read flag is actually a reference count so multiple users may
|
550 |
* use the feature without worrying about clobbering its previous state.
|
551 |
* Copy-on-read stays enabled until all users have called to disable it.
|
552 |
*/
|
553 |
void bdrv_enable_copy_on_read(BlockDriverState *bs)
|
554 |
{ |
555 |
bs->copy_on_read++; |
556 |
} |
557 |
|
558 |
void bdrv_disable_copy_on_read(BlockDriverState *bs)
|
559 |
{ |
560 |
assert(bs->copy_on_read > 0);
|
561 |
bs->copy_on_read--; |
562 |
} |
563 |
|
564 |
/*
|
565 |
* Common part for opening disk images and files
|
566 |
*/
|
567 |
static int bdrv_open_common(BlockDriverState *bs, const char *filename, |
568 |
int flags, BlockDriver *drv)
|
569 |
{ |
570 |
int ret, open_flags;
|
571 |
|
572 |
assert(drv != NULL);
|
573 |
|
574 |
trace_bdrv_open_common(bs, filename, flags, drv->format_name); |
575 |
|
576 |
bs->file = NULL;
|
577 |
bs->total_sectors = 0;
|
578 |
bs->encrypted = 0;
|
579 |
bs->valid_key = 0;
|
580 |
bs->sg = 0;
|
581 |
bs->open_flags = flags; |
582 |
bs->growable = 0;
|
583 |
bs->buffer_alignment = 512;
|
584 |
|
585 |
assert(bs->copy_on_read == 0); /* bdrv_new() and bdrv_close() make it so */ |
586 |
if ((flags & BDRV_O_RDWR) && (flags & BDRV_O_COPY_ON_READ)) {
|
587 |
bdrv_enable_copy_on_read(bs); |
588 |
} |
589 |
|
590 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
591 |
bs->backing_file[0] = '\0'; |
592 |
|
593 |
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
|
594 |
return -ENOTSUP;
|
595 |
} |
596 |
|
597 |
bs->drv = drv; |
598 |
bs->opaque = g_malloc0(drv->instance_size); |
599 |
|
600 |
bs->enable_write_cache = !!(flags & BDRV_O_CACHE_WB); |
601 |
|
602 |
/*
|
603 |
* Clear flags that are internal to the block layer before opening the
|
604 |
* image.
|
605 |
*/
|
606 |
open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
607 |
|
608 |
/*
|
609 |
* Snapshots should be writable.
|
610 |
*/
|
611 |
if (bs->is_temporary) {
|
612 |
open_flags |= BDRV_O_RDWR; |
613 |
} |
614 |
|
615 |
bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
616 |
|
617 |
/* Open the image, either directly or using a protocol */
|
618 |
if (drv->bdrv_file_open) {
|
619 |
ret = drv->bdrv_file_open(bs, filename, open_flags); |
620 |
} else {
|
621 |
ret = bdrv_file_open(&bs->file, filename, open_flags); |
622 |
if (ret >= 0) { |
623 |
ret = drv->bdrv_open(bs, open_flags); |
624 |
} |
625 |
} |
626 |
|
627 |
if (ret < 0) { |
628 |
goto free_and_fail;
|
629 |
} |
630 |
|
631 |
ret = refresh_total_sectors(bs, bs->total_sectors); |
632 |
if (ret < 0) { |
633 |
goto free_and_fail;
|
634 |
} |
635 |
|
636 |
#ifndef _WIN32
|
637 |
if (bs->is_temporary) {
|
638 |
unlink(filename); |
639 |
} |
640 |
#endif
|
641 |
return 0; |
642 |
|
643 |
free_and_fail:
|
644 |
if (bs->file) {
|
645 |
bdrv_delete(bs->file); |
646 |
bs->file = NULL;
|
647 |
} |
648 |
g_free(bs->opaque); |
649 |
bs->opaque = NULL;
|
650 |
bs->drv = NULL;
|
651 |
return ret;
|
652 |
} |
653 |
|
654 |
/*
|
655 |
* Opens a file using a protocol (file, host_device, nbd, ...)
|
656 |
*/
|
657 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
658 |
{ |
659 |
BlockDriverState *bs; |
660 |
BlockDriver *drv; |
661 |
int ret;
|
662 |
|
663 |
drv = bdrv_find_protocol(filename); |
664 |
if (!drv) {
|
665 |
return -ENOENT;
|
666 |
} |
667 |
|
668 |
bs = bdrv_new("");
|
669 |
ret = bdrv_open_common(bs, filename, flags, drv); |
670 |
if (ret < 0) { |
671 |
bdrv_delete(bs); |
672 |
return ret;
|
673 |
} |
674 |
bs->growable = 1;
|
675 |
*pbs = bs; |
676 |
return 0; |
677 |
} |
678 |
|
679 |
/*
|
680 |
* Opens a disk image (raw, qcow2, vmdk, ...)
|
681 |
*/
|
682 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
683 |
BlockDriver *drv) |
684 |
{ |
685 |
int ret;
|
686 |
char tmp_filename[PATH_MAX];
|
687 |
|
688 |
if (flags & BDRV_O_SNAPSHOT) {
|
689 |
BlockDriverState *bs1; |
690 |
int64_t total_size; |
691 |
int is_protocol = 0; |
692 |
BlockDriver *bdrv_qcow2; |
693 |
QEMUOptionParameter *options; |
694 |
char backing_filename[PATH_MAX];
|
695 |
|
696 |
/* if snapshot, we create a temporary backing file and open it
|
697 |
instead of opening 'filename' directly */
|
698 |
|
699 |
/* if there is a backing file, use it */
|
700 |
bs1 = bdrv_new("");
|
701 |
ret = bdrv_open(bs1, filename, 0, drv);
|
702 |
if (ret < 0) { |
703 |
bdrv_delete(bs1); |
704 |
return ret;
|
705 |
} |
706 |
total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
707 |
|
708 |
if (bs1->drv && bs1->drv->protocol_name)
|
709 |
is_protocol = 1;
|
710 |
|
711 |
bdrv_delete(bs1); |
712 |
|
713 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
714 |
|
715 |
/* Real path is meaningless for protocols */
|
716 |
if (is_protocol)
|
717 |
snprintf(backing_filename, sizeof(backing_filename),
|
718 |
"%s", filename);
|
719 |
else if (!realpath(filename, backing_filename)) |
720 |
return -errno;
|
721 |
|
722 |
bdrv_qcow2 = bdrv_find_format("qcow2");
|
723 |
options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
724 |
|
725 |
set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
726 |
set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
727 |
if (drv) {
|
728 |
set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
729 |
drv->format_name); |
730 |
} |
731 |
|
732 |
ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
733 |
free_option_parameters(options); |
734 |
if (ret < 0) { |
735 |
return ret;
|
736 |
} |
737 |
|
738 |
filename = tmp_filename; |
739 |
drv = bdrv_qcow2; |
740 |
bs->is_temporary = 1;
|
741 |
} |
742 |
|
743 |
/* Find the right image format driver */
|
744 |
if (!drv) {
|
745 |
ret = find_image_format(filename, &drv); |
746 |
} |
747 |
|
748 |
if (!drv) {
|
749 |
goto unlink_and_fail;
|
750 |
} |
751 |
|
752 |
/* Open the image */
|
753 |
ret = bdrv_open_common(bs, filename, flags, drv); |
754 |
if (ret < 0) { |
755 |
goto unlink_and_fail;
|
756 |
} |
757 |
|
758 |
/* If there is a backing file, use it */
|
759 |
if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { |
760 |
char backing_filename[PATH_MAX];
|
761 |
int back_flags;
|
762 |
BlockDriver *back_drv = NULL;
|
763 |
|
764 |
bs->backing_hd = bdrv_new("");
|
765 |
|
766 |
if (path_has_protocol(bs->backing_file)) {
|
767 |
pstrcpy(backing_filename, sizeof(backing_filename),
|
768 |
bs->backing_file); |
769 |
} else {
|
770 |
path_combine(backing_filename, sizeof(backing_filename),
|
771 |
filename, bs->backing_file); |
772 |
} |
773 |
|
774 |
if (bs->backing_format[0] != '\0') { |
775 |
back_drv = bdrv_find_format(bs->backing_format); |
776 |
} |
777 |
|
778 |
/* backing files always opened read-only */
|
779 |
back_flags = |
780 |
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
781 |
|
782 |
ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); |
783 |
if (ret < 0) { |
784 |
bdrv_close(bs); |
785 |
return ret;
|
786 |
} |
787 |
if (bs->is_temporary) {
|
788 |
bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); |
789 |
} else {
|
790 |
/* base image inherits from "parent" */
|
791 |
bs->backing_hd->keep_read_only = bs->keep_read_only; |
792 |
} |
793 |
} |
794 |
|
795 |
if (!bdrv_key_required(bs)) {
|
796 |
bdrv_dev_change_media_cb(bs, true);
|
797 |
} |
798 |
|
799 |
/* throttling disk I/O limits */
|
800 |
if (bs->io_limits_enabled) {
|
801 |
bdrv_io_limits_enable(bs); |
802 |
} |
803 |
|
804 |
return 0; |
805 |
|
806 |
unlink_and_fail:
|
807 |
if (bs->is_temporary) {
|
808 |
unlink(filename); |
809 |
} |
810 |
return ret;
|
811 |
} |
812 |
|
813 |
void bdrv_close(BlockDriverState *bs)
|
814 |
{ |
815 |
if (bs->drv) {
|
816 |
if (bs == bs_snapshots) {
|
817 |
bs_snapshots = NULL;
|
818 |
} |
819 |
if (bs->backing_hd) {
|
820 |
bdrv_delete(bs->backing_hd); |
821 |
bs->backing_hd = NULL;
|
822 |
} |
823 |
bs->drv->bdrv_close(bs); |
824 |
g_free(bs->opaque); |
825 |
#ifdef _WIN32
|
826 |
if (bs->is_temporary) {
|
827 |
unlink(bs->filename); |
828 |
} |
829 |
#endif
|
830 |
bs->opaque = NULL;
|
831 |
bs->drv = NULL;
|
832 |
bs->copy_on_read = 0;
|
833 |
|
834 |
if (bs->file != NULL) { |
835 |
bdrv_close(bs->file); |
836 |
} |
837 |
|
838 |
bdrv_dev_change_media_cb(bs, false);
|
839 |
} |
840 |
|
841 |
/*throttling disk I/O limits*/
|
842 |
if (bs->io_limits_enabled) {
|
843 |
bdrv_io_limits_disable(bs); |
844 |
} |
845 |
} |
846 |
|
847 |
void bdrv_close_all(void) |
848 |
{ |
849 |
BlockDriverState *bs; |
850 |
|
851 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
852 |
bdrv_close(bs); |
853 |
} |
854 |
} |
855 |
|
856 |
/*
|
857 |
* Wait for pending requests to complete across all BlockDriverStates
|
858 |
*
|
859 |
* This function does not flush data to disk, use bdrv_flush_all() for that
|
860 |
* after calling this function.
|
861 |
*/
|
862 |
void bdrv_drain_all(void) |
863 |
{ |
864 |
BlockDriverState *bs; |
865 |
|
866 |
qemu_aio_flush(); |
867 |
|
868 |
/* If requests are still pending there is a bug somewhere */
|
869 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
870 |
assert(QLIST_EMPTY(&bs->tracked_requests)); |
871 |
assert(qemu_co_queue_empty(&bs->throttled_reqs)); |
872 |
} |
873 |
} |
874 |
|
875 |
/* make a BlockDriverState anonymous by removing from bdrv_state list.
|
876 |
Also, NULL terminate the device_name to prevent double remove */
|
877 |
void bdrv_make_anon(BlockDriverState *bs)
|
878 |
{ |
879 |
if (bs->device_name[0] != '\0') { |
880 |
QTAILQ_REMOVE(&bdrv_states, bs, list); |
881 |
} |
882 |
bs->device_name[0] = '\0'; |
883 |
} |
884 |
|
885 |
/*
|
886 |
* Add new bs contents at the top of an image chain while the chain is
|
887 |
* live, while keeping required fields on the top layer.
|
888 |
*
|
889 |
* This will modify the BlockDriverState fields, and swap contents
|
890 |
* between bs_new and bs_top. Both bs_new and bs_top are modified.
|
891 |
*
|
892 |
* This function does not create any image files.
|
893 |
*/
|
894 |
void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top)
|
895 |
{ |
896 |
BlockDriverState tmp; |
897 |
|
898 |
/* the new bs must not be in bdrv_states */
|
899 |
bdrv_make_anon(bs_new); |
900 |
|
901 |
tmp = *bs_new; |
902 |
|
903 |
/* there are some fields that need to stay on the top layer: */
|
904 |
|
905 |
/* dev info */
|
906 |
tmp.dev_ops = bs_top->dev_ops; |
907 |
tmp.dev_opaque = bs_top->dev_opaque; |
908 |
tmp.dev = bs_top->dev; |
909 |
tmp.buffer_alignment = bs_top->buffer_alignment; |
910 |
tmp.copy_on_read = bs_top->copy_on_read; |
911 |
|
912 |
/* i/o timing parameters */
|
913 |
tmp.slice_time = bs_top->slice_time; |
914 |
tmp.slice_start = bs_top->slice_start; |
915 |
tmp.slice_end = bs_top->slice_end; |
916 |
tmp.io_limits = bs_top->io_limits; |
917 |
tmp.io_base = bs_top->io_base; |
918 |
tmp.throttled_reqs = bs_top->throttled_reqs; |
919 |
tmp.block_timer = bs_top->block_timer; |
920 |
tmp.io_limits_enabled = bs_top->io_limits_enabled; |
921 |
|
922 |
/* geometry */
|
923 |
tmp.cyls = bs_top->cyls; |
924 |
tmp.heads = bs_top->heads; |
925 |
tmp.secs = bs_top->secs; |
926 |
tmp.translation = bs_top->translation; |
927 |
|
928 |
/* r/w error */
|
929 |
tmp.on_read_error = bs_top->on_read_error; |
930 |
tmp.on_write_error = bs_top->on_write_error; |
931 |
|
932 |
/* i/o status */
|
933 |
tmp.iostatus_enabled = bs_top->iostatus_enabled; |
934 |
tmp.iostatus = bs_top->iostatus; |
935 |
|
936 |
/* keep the same entry in bdrv_states */
|
937 |
pstrcpy(tmp.device_name, sizeof(tmp.device_name), bs_top->device_name);
|
938 |
tmp.list = bs_top->list; |
939 |
|
940 |
/* The contents of 'tmp' will become bs_top, as we are
|
941 |
* swapping bs_new and bs_top contents. */
|
942 |
tmp.backing_hd = bs_new; |
943 |
pstrcpy(tmp.backing_file, sizeof(tmp.backing_file), bs_top->filename);
|
944 |
|
945 |
/* swap contents of the fixed new bs and the current top */
|
946 |
*bs_new = *bs_top; |
947 |
*bs_top = tmp; |
948 |
|
949 |
/* clear the copied fields in the new backing file */
|
950 |
bdrv_detach_dev(bs_new, bs_new->dev); |
951 |
|
952 |
qemu_co_queue_init(&bs_new->throttled_reqs); |
953 |
memset(&bs_new->io_base, 0, sizeof(bs_new->io_base)); |
954 |
memset(&bs_new->io_limits, 0, sizeof(bs_new->io_limits)); |
955 |
bdrv_iostatus_disable(bs_new); |
956 |
|
957 |
/* we don't use bdrv_io_limits_disable() for this, because we don't want
|
958 |
* to affect or delete the block_timer, as it has been moved to bs_top */
|
959 |
bs_new->io_limits_enabled = false;
|
960 |
bs_new->block_timer = NULL;
|
961 |
bs_new->slice_time = 0;
|
962 |
bs_new->slice_start = 0;
|
963 |
bs_new->slice_end = 0;
|
964 |
} |
965 |
|
966 |
void bdrv_delete(BlockDriverState *bs)
|
967 |
{ |
968 |
assert(!bs->dev); |
969 |
|
970 |
/* remove from list, if necessary */
|
971 |
bdrv_make_anon(bs); |
972 |
|
973 |
bdrv_close(bs); |
974 |
if (bs->file != NULL) { |
975 |
bdrv_delete(bs->file); |
976 |
} |
977 |
|
978 |
assert(bs != bs_snapshots); |
979 |
g_free(bs); |
980 |
} |
981 |
|
982 |
int bdrv_attach_dev(BlockDriverState *bs, void *dev) |
983 |
/* TODO change to DeviceState *dev when all users are qdevified */
|
984 |
{ |
985 |
if (bs->dev) {
|
986 |
return -EBUSY;
|
987 |
} |
988 |
bs->dev = dev; |
989 |
bdrv_iostatus_reset(bs); |
990 |
return 0; |
991 |
} |
992 |
|
993 |
/* TODO qdevified devices don't use this, remove when devices are qdevified */
|
994 |
void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) |
995 |
{ |
996 |
if (bdrv_attach_dev(bs, dev) < 0) { |
997 |
abort(); |
998 |
} |
999 |
} |
1000 |
|
1001 |
void bdrv_detach_dev(BlockDriverState *bs, void *dev) |
1002 |
/* TODO change to DeviceState *dev when all users are qdevified */
|
1003 |
{ |
1004 |
assert(bs->dev == dev); |
1005 |
bs->dev = NULL;
|
1006 |
bs->dev_ops = NULL;
|
1007 |
bs->dev_opaque = NULL;
|
1008 |
bs->buffer_alignment = 512;
|
1009 |
} |
1010 |
|
1011 |
/* TODO change to return DeviceState * when all users are qdevified */
|
1012 |
void *bdrv_get_attached_dev(BlockDriverState *bs)
|
1013 |
{ |
1014 |
return bs->dev;
|
1015 |
} |
1016 |
|
1017 |
void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, |
1018 |
void *opaque)
|
1019 |
{ |
1020 |
bs->dev_ops = ops; |
1021 |
bs->dev_opaque = opaque; |
1022 |
if (bdrv_dev_has_removable_media(bs) && bs == bs_snapshots) {
|
1023 |
bs_snapshots = NULL;
|
1024 |
} |
1025 |
} |
1026 |
|
1027 |
void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv, |
1028 |
BlockQMPEventAction action, int is_read)
|
1029 |
{ |
1030 |
QObject *data; |
1031 |
const char *action_str; |
1032 |
|
1033 |
switch (action) {
|
1034 |
case BDRV_ACTION_REPORT:
|
1035 |
action_str = "report";
|
1036 |
break;
|
1037 |
case BDRV_ACTION_IGNORE:
|
1038 |
action_str = "ignore";
|
1039 |
break;
|
1040 |
case BDRV_ACTION_STOP:
|
1041 |
action_str = "stop";
|
1042 |
break;
|
1043 |
default:
|
1044 |
abort(); |
1045 |
} |
1046 |
|
1047 |
data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
|
1048 |
bdrv->device_name, |
1049 |
action_str, |
1050 |
is_read ? "read" : "write"); |
1051 |
monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); |
1052 |
|
1053 |
qobject_decref(data); |
1054 |
} |
1055 |
|
1056 |
static void bdrv_emit_qmp_eject_event(BlockDriverState *bs, bool ejected) |
1057 |
{ |
1058 |
QObject *data; |
1059 |
|
1060 |
data = qobject_from_jsonf("{ 'device': %s, 'tray-open': %i }",
|
1061 |
bdrv_get_device_name(bs), ejected); |
1062 |
monitor_protocol_event(QEVENT_DEVICE_TRAY_MOVED, data); |
1063 |
|
1064 |
qobject_decref(data); |
1065 |
} |
1066 |
|
1067 |
static void bdrv_dev_change_media_cb(BlockDriverState *bs, bool load) |
1068 |
{ |
1069 |
if (bs->dev_ops && bs->dev_ops->change_media_cb) {
|
1070 |
bool tray_was_closed = !bdrv_dev_is_tray_open(bs);
|
1071 |
bs->dev_ops->change_media_cb(bs->dev_opaque, load); |
1072 |
if (tray_was_closed) {
|
1073 |
/* tray open */
|
1074 |
bdrv_emit_qmp_eject_event(bs, true);
|
1075 |
} |
1076 |
if (load) {
|
1077 |
/* tray close */
|
1078 |
bdrv_emit_qmp_eject_event(bs, false);
|
1079 |
} |
1080 |
} |
1081 |
} |
1082 |
|
1083 |
bool bdrv_dev_has_removable_media(BlockDriverState *bs)
|
1084 |
{ |
1085 |
return !bs->dev || (bs->dev_ops && bs->dev_ops->change_media_cb);
|
1086 |
} |
1087 |
|
1088 |
void bdrv_dev_eject_request(BlockDriverState *bs, bool force) |
1089 |
{ |
1090 |
if (bs->dev_ops && bs->dev_ops->eject_request_cb) {
|
1091 |
bs->dev_ops->eject_request_cb(bs->dev_opaque, force); |
1092 |
} |
1093 |
} |
1094 |
|
1095 |
bool bdrv_dev_is_tray_open(BlockDriverState *bs)
|
1096 |
{ |
1097 |
if (bs->dev_ops && bs->dev_ops->is_tray_open) {
|
1098 |
return bs->dev_ops->is_tray_open(bs->dev_opaque);
|
1099 |
} |
1100 |
return false; |
1101 |
} |
1102 |
|
1103 |
static void bdrv_dev_resize_cb(BlockDriverState *bs) |
1104 |
{ |
1105 |
if (bs->dev_ops && bs->dev_ops->resize_cb) {
|
1106 |
bs->dev_ops->resize_cb(bs->dev_opaque); |
1107 |
} |
1108 |
} |
1109 |
|
1110 |
bool bdrv_dev_is_medium_locked(BlockDriverState *bs)
|
1111 |
{ |
1112 |
if (bs->dev_ops && bs->dev_ops->is_medium_locked) {
|
1113 |
return bs->dev_ops->is_medium_locked(bs->dev_opaque);
|
1114 |
} |
1115 |
return false; |
1116 |
} |
1117 |
|
1118 |
/*
|
1119 |
* Run consistency checks on an image
|
1120 |
*
|
1121 |
* Returns 0 if the check could be completed (it doesn't mean that the image is
|
1122 |
* free of errors) or -errno when an internal error occurred. The results of the
|
1123 |
* check are stored in res.
|
1124 |
*/
|
1125 |
int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res)
|
1126 |
{ |
1127 |
if (bs->drv->bdrv_check == NULL) { |
1128 |
return -ENOTSUP;
|
1129 |
} |
1130 |
|
1131 |
memset(res, 0, sizeof(*res)); |
1132 |
return bs->drv->bdrv_check(bs, res);
|
1133 |
} |
1134 |
|
1135 |
#define COMMIT_BUF_SECTORS 2048 |
1136 |
|
1137 |
/* commit COW file into the raw image */
|
1138 |
int bdrv_commit(BlockDriverState *bs)
|
1139 |
{ |
1140 |
BlockDriver *drv = bs->drv; |
1141 |
BlockDriver *backing_drv; |
1142 |
int64_t sector, total_sectors; |
1143 |
int n, ro, open_flags;
|
1144 |
int ret = 0, rw_ret = 0; |
1145 |
uint8_t *buf; |
1146 |
char filename[1024]; |
1147 |
BlockDriverState *bs_rw, *bs_ro; |
1148 |
|
1149 |
if (!drv)
|
1150 |
return -ENOMEDIUM;
|
1151 |
|
1152 |
if (!bs->backing_hd) {
|
1153 |
return -ENOTSUP;
|
1154 |
} |
1155 |
|
1156 |
if (bs->backing_hd->keep_read_only) {
|
1157 |
return -EACCES;
|
1158 |
} |
1159 |
|
1160 |
if (bdrv_in_use(bs) || bdrv_in_use(bs->backing_hd)) {
|
1161 |
return -EBUSY;
|
1162 |
} |
1163 |
|
1164 |
backing_drv = bs->backing_hd->drv; |
1165 |
ro = bs->backing_hd->read_only; |
1166 |
strncpy(filename, bs->backing_hd->filename, sizeof(filename));
|
1167 |
open_flags = bs->backing_hd->open_flags; |
1168 |
|
1169 |
if (ro) {
|
1170 |
/* re-open as RW */
|
1171 |
bdrv_delete(bs->backing_hd); |
1172 |
bs->backing_hd = NULL;
|
1173 |
bs_rw = bdrv_new("");
|
1174 |
rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, |
1175 |
backing_drv); |
1176 |
if (rw_ret < 0) { |
1177 |
bdrv_delete(bs_rw); |
1178 |
/* try to re-open read-only */
|
1179 |
bs_ro = bdrv_new("");
|
1180 |
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
1181 |
backing_drv); |
1182 |
if (ret < 0) { |
1183 |
bdrv_delete(bs_ro); |
1184 |
/* drive not functional anymore */
|
1185 |
bs->drv = NULL;
|
1186 |
return ret;
|
1187 |
} |
1188 |
bs->backing_hd = bs_ro; |
1189 |
return rw_ret;
|
1190 |
} |
1191 |
bs->backing_hd = bs_rw; |
1192 |
} |
1193 |
|
1194 |
total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
1195 |
buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
1196 |
|
1197 |
for (sector = 0; sector < total_sectors; sector += n) { |
1198 |
if (bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) {
|
1199 |
|
1200 |
if (bdrv_read(bs, sector, buf, n) != 0) { |
1201 |
ret = -EIO; |
1202 |
goto ro_cleanup;
|
1203 |
} |
1204 |
|
1205 |
if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { |
1206 |
ret = -EIO; |
1207 |
goto ro_cleanup;
|
1208 |
} |
1209 |
} |
1210 |
} |
1211 |
|
1212 |
if (drv->bdrv_make_empty) {
|
1213 |
ret = drv->bdrv_make_empty(bs); |
1214 |
bdrv_flush(bs); |
1215 |
} |
1216 |
|
1217 |
/*
|
1218 |
* Make sure all data we wrote to the backing device is actually
|
1219 |
* stable on disk.
|
1220 |
*/
|
1221 |
if (bs->backing_hd)
|
1222 |
bdrv_flush(bs->backing_hd); |
1223 |
|
1224 |
ro_cleanup:
|
1225 |
g_free(buf); |
1226 |
|
1227 |
if (ro) {
|
1228 |
/* re-open as RO */
|
1229 |
bdrv_delete(bs->backing_hd); |
1230 |
bs->backing_hd = NULL;
|
1231 |
bs_ro = bdrv_new("");
|
1232 |
ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
1233 |
backing_drv); |
1234 |
if (ret < 0) { |
1235 |
bdrv_delete(bs_ro); |
1236 |
/* drive not functional anymore */
|
1237 |
bs->drv = NULL;
|
1238 |
return ret;
|
1239 |
} |
1240 |
bs->backing_hd = bs_ro; |
1241 |
bs->backing_hd->keep_read_only = 0;
|
1242 |
} |
1243 |
|
1244 |
return ret;
|
1245 |
} |
1246 |
|
1247 |
void bdrv_commit_all(void) |
1248 |
{ |
1249 |
BlockDriverState *bs; |
1250 |
|
1251 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1252 |
bdrv_commit(bs); |
1253 |
} |
1254 |
} |
1255 |
|
1256 |
struct BdrvTrackedRequest {
|
1257 |
BlockDriverState *bs; |
1258 |
int64_t sector_num; |
1259 |
int nb_sectors;
|
1260 |
bool is_write;
|
1261 |
QLIST_ENTRY(BdrvTrackedRequest) list; |
1262 |
Coroutine *co; /* owner, used for deadlock detection */
|
1263 |
CoQueue wait_queue; /* coroutines blocked on this request */
|
1264 |
}; |
1265 |
|
1266 |
/**
|
1267 |
* Remove an active request from the tracked requests list
|
1268 |
*
|
1269 |
* This function should be called when a tracked request is completing.
|
1270 |
*/
|
1271 |
static void tracked_request_end(BdrvTrackedRequest *req) |
1272 |
{ |
1273 |
QLIST_REMOVE(req, list); |
1274 |
qemu_co_queue_restart_all(&req->wait_queue); |
1275 |
} |
1276 |
|
1277 |
/**
|
1278 |
* Add an active request to the tracked requests list
|
1279 |
*/
|
1280 |
static void tracked_request_begin(BdrvTrackedRequest *req, |
1281 |
BlockDriverState *bs, |
1282 |
int64_t sector_num, |
1283 |
int nb_sectors, bool is_write) |
1284 |
{ |
1285 |
*req = (BdrvTrackedRequest){ |
1286 |
.bs = bs, |
1287 |
.sector_num = sector_num, |
1288 |
.nb_sectors = nb_sectors, |
1289 |
.is_write = is_write, |
1290 |
.co = qemu_coroutine_self(), |
1291 |
}; |
1292 |
|
1293 |
qemu_co_queue_init(&req->wait_queue); |
1294 |
|
1295 |
QLIST_INSERT_HEAD(&bs->tracked_requests, req, list); |
1296 |
} |
1297 |
|
1298 |
/**
|
1299 |
* Round a region to cluster boundaries
|
1300 |
*/
|
1301 |
static void round_to_clusters(BlockDriverState *bs, |
1302 |
int64_t sector_num, int nb_sectors,
|
1303 |
int64_t *cluster_sector_num, |
1304 |
int *cluster_nb_sectors)
|
1305 |
{ |
1306 |
BlockDriverInfo bdi; |
1307 |
|
1308 |
if (bdrv_get_info(bs, &bdi) < 0 || bdi.cluster_size == 0) { |
1309 |
*cluster_sector_num = sector_num; |
1310 |
*cluster_nb_sectors = nb_sectors; |
1311 |
} else {
|
1312 |
int64_t c = bdi.cluster_size / BDRV_SECTOR_SIZE; |
1313 |
*cluster_sector_num = QEMU_ALIGN_DOWN(sector_num, c); |
1314 |
*cluster_nb_sectors = QEMU_ALIGN_UP(sector_num - *cluster_sector_num + |
1315 |
nb_sectors, c); |
1316 |
} |
1317 |
} |
1318 |
|
1319 |
static bool tracked_request_overlaps(BdrvTrackedRequest *req, |
1320 |
int64_t sector_num, int nb_sectors) {
|
1321 |
/* aaaa bbbb */
|
1322 |
if (sector_num >= req->sector_num + req->nb_sectors) {
|
1323 |
return false; |
1324 |
} |
1325 |
/* bbbb aaaa */
|
1326 |
if (req->sector_num >= sector_num + nb_sectors) {
|
1327 |
return false; |
1328 |
} |
1329 |
return true; |
1330 |
} |
1331 |
|
1332 |
static void coroutine_fn wait_for_overlapping_requests(BlockDriverState *bs, |
1333 |
int64_t sector_num, int nb_sectors)
|
1334 |
{ |
1335 |
BdrvTrackedRequest *req; |
1336 |
int64_t cluster_sector_num; |
1337 |
int cluster_nb_sectors;
|
1338 |
bool retry;
|
1339 |
|
1340 |
/* If we touch the same cluster it counts as an overlap. This guarantees
|
1341 |
* that allocating writes will be serialized and not race with each other
|
1342 |
* for the same cluster. For example, in copy-on-read it ensures that the
|
1343 |
* CoR read and write operations are atomic and guest writes cannot
|
1344 |
* interleave between them.
|
1345 |
*/
|
1346 |
round_to_clusters(bs, sector_num, nb_sectors, |
1347 |
&cluster_sector_num, &cluster_nb_sectors); |
1348 |
|
1349 |
do {
|
1350 |
retry = false;
|
1351 |
QLIST_FOREACH(req, &bs->tracked_requests, list) { |
1352 |
if (tracked_request_overlaps(req, cluster_sector_num,
|
1353 |
cluster_nb_sectors)) { |
1354 |
/* Hitting this means there was a reentrant request, for
|
1355 |
* example, a block driver issuing nested requests. This must
|
1356 |
* never happen since it means deadlock.
|
1357 |
*/
|
1358 |
assert(qemu_coroutine_self() != req->co); |
1359 |
|
1360 |
qemu_co_queue_wait(&req->wait_queue); |
1361 |
retry = true;
|
1362 |
break;
|
1363 |
} |
1364 |
} |
1365 |
} while (retry);
|
1366 |
} |
1367 |
|
1368 |
/*
|
1369 |
* Return values:
|
1370 |
* 0 - success
|
1371 |
* -EINVAL - backing format specified, but no file
|
1372 |
* -ENOSPC - can't update the backing file because no space is left in the
|
1373 |
* image file header
|
1374 |
* -ENOTSUP - format driver doesn't support changing the backing file
|
1375 |
*/
|
1376 |
int bdrv_change_backing_file(BlockDriverState *bs,
|
1377 |
const char *backing_file, const char *backing_fmt) |
1378 |
{ |
1379 |
BlockDriver *drv = bs->drv; |
1380 |
|
1381 |
if (drv->bdrv_change_backing_file != NULL) { |
1382 |
return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
|
1383 |
} else {
|
1384 |
return -ENOTSUP;
|
1385 |
} |
1386 |
} |
1387 |
|
1388 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
1389 |
size_t size) |
1390 |
{ |
1391 |
int64_t len; |
1392 |
|
1393 |
if (!bdrv_is_inserted(bs))
|
1394 |
return -ENOMEDIUM;
|
1395 |
|
1396 |
if (bs->growable)
|
1397 |
return 0; |
1398 |
|
1399 |
len = bdrv_getlength(bs); |
1400 |
|
1401 |
if (offset < 0) |
1402 |
return -EIO;
|
1403 |
|
1404 |
if ((offset > len) || (len - offset < size))
|
1405 |
return -EIO;
|
1406 |
|
1407 |
return 0; |
1408 |
} |
1409 |
|
1410 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
1411 |
int nb_sectors)
|
1412 |
{ |
1413 |
return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
|
1414 |
nb_sectors * BDRV_SECTOR_SIZE); |
1415 |
} |
1416 |
|
1417 |
typedef struct RwCo { |
1418 |
BlockDriverState *bs; |
1419 |
int64_t sector_num; |
1420 |
int nb_sectors;
|
1421 |
QEMUIOVector *qiov; |
1422 |
bool is_write;
|
1423 |
int ret;
|
1424 |
} RwCo; |
1425 |
|
1426 |
static void coroutine_fn bdrv_rw_co_entry(void *opaque) |
1427 |
{ |
1428 |
RwCo *rwco = opaque; |
1429 |
|
1430 |
if (!rwco->is_write) {
|
1431 |
rwco->ret = bdrv_co_do_readv(rwco->bs, rwco->sector_num, |
1432 |
rwco->nb_sectors, rwco->qiov, 0);
|
1433 |
} else {
|
1434 |
rwco->ret = bdrv_co_do_writev(rwco->bs, rwco->sector_num, |
1435 |
rwco->nb_sectors, rwco->qiov, 0);
|
1436 |
} |
1437 |
} |
1438 |
|
1439 |
/*
|
1440 |
* Process a synchronous request using coroutines
|
1441 |
*/
|
1442 |
static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, |
1443 |
int nb_sectors, bool is_write) |
1444 |
{ |
1445 |
QEMUIOVector qiov; |
1446 |
struct iovec iov = {
|
1447 |
.iov_base = (void *)buf,
|
1448 |
.iov_len = nb_sectors * BDRV_SECTOR_SIZE, |
1449 |
}; |
1450 |
Coroutine *co; |
1451 |
RwCo rwco = { |
1452 |
.bs = bs, |
1453 |
.sector_num = sector_num, |
1454 |
.nb_sectors = nb_sectors, |
1455 |
.qiov = &qiov, |
1456 |
.is_write = is_write, |
1457 |
.ret = NOT_DONE, |
1458 |
}; |
1459 |
|
1460 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
1461 |
|
1462 |
if (qemu_in_coroutine()) {
|
1463 |
/* Fast-path if already in coroutine context */
|
1464 |
bdrv_rw_co_entry(&rwco); |
1465 |
} else {
|
1466 |
co = qemu_coroutine_create(bdrv_rw_co_entry); |
1467 |
qemu_coroutine_enter(co, &rwco); |
1468 |
while (rwco.ret == NOT_DONE) {
|
1469 |
qemu_aio_wait(); |
1470 |
} |
1471 |
} |
1472 |
return rwco.ret;
|
1473 |
} |
1474 |
|
1475 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
1476 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
1477 |
uint8_t *buf, int nb_sectors)
|
1478 |
{ |
1479 |
return bdrv_rw_co(bs, sector_num, buf, nb_sectors, false); |
1480 |
} |
1481 |
|
1482 |
static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
1483 |
int nb_sectors, int dirty) |
1484 |
{ |
1485 |
int64_t start, end; |
1486 |
unsigned long val, idx, bit; |
1487 |
|
1488 |
start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
1489 |
end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
1490 |
|
1491 |
for (; start <= end; start++) {
|
1492 |
idx = start / (sizeof(unsigned long) * 8); |
1493 |
bit = start % (sizeof(unsigned long) * 8); |
1494 |
val = bs->dirty_bitmap[idx]; |
1495 |
if (dirty) {
|
1496 |
if (!(val & (1UL << bit))) { |
1497 |
bs->dirty_count++; |
1498 |
val |= 1UL << bit;
|
1499 |
} |
1500 |
} else {
|
1501 |
if (val & (1UL << bit)) { |
1502 |
bs->dirty_count--; |
1503 |
val &= ~(1UL << bit);
|
1504 |
} |
1505 |
} |
1506 |
bs->dirty_bitmap[idx] = val; |
1507 |
} |
1508 |
} |
1509 |
|
1510 |
/* Return < 0 if error. Important errors are:
|
1511 |
-EIO generic I/O error (may happen for all errors)
|
1512 |
-ENOMEDIUM No media inserted.
|
1513 |
-EINVAL Invalid sector number or nb_sectors
|
1514 |
-EACCES Trying to write a read-only device
|
1515 |
*/
|
1516 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
1517 |
const uint8_t *buf, int nb_sectors) |
1518 |
{ |
1519 |
return bdrv_rw_co(bs, sector_num, (uint8_t *)buf, nb_sectors, true); |
1520 |
} |
1521 |
|
1522 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
1523 |
void *buf, int count1) |
1524 |
{ |
1525 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
1526 |
int len, nb_sectors, count;
|
1527 |
int64_t sector_num; |
1528 |
int ret;
|
1529 |
|
1530 |
count = count1; |
1531 |
/* first read to align to sector start */
|
1532 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
1533 |
if (len > count)
|
1534 |
len = count; |
1535 |
sector_num = offset >> BDRV_SECTOR_BITS; |
1536 |
if (len > 0) { |
1537 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1538 |
return ret;
|
1539 |
memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
|
1540 |
count -= len; |
1541 |
if (count == 0) |
1542 |
return count1;
|
1543 |
sector_num++; |
1544 |
buf += len; |
1545 |
} |
1546 |
|
1547 |
/* read the sectors "in place" */
|
1548 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
1549 |
if (nb_sectors > 0) { |
1550 |
if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
1551 |
return ret;
|
1552 |
sector_num += nb_sectors; |
1553 |
len = nb_sectors << BDRV_SECTOR_BITS; |
1554 |
buf += len; |
1555 |
count -= len; |
1556 |
} |
1557 |
|
1558 |
/* add data from the last sector */
|
1559 |
if (count > 0) { |
1560 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1561 |
return ret;
|
1562 |
memcpy(buf, tmp_buf, count); |
1563 |
} |
1564 |
return count1;
|
1565 |
} |
1566 |
|
1567 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
1568 |
const void *buf, int count1) |
1569 |
{ |
1570 |
uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
1571 |
int len, nb_sectors, count;
|
1572 |
int64_t sector_num; |
1573 |
int ret;
|
1574 |
|
1575 |
count = count1; |
1576 |
/* first write to align to sector start */
|
1577 |
len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
1578 |
if (len > count)
|
1579 |
len = count; |
1580 |
sector_num = offset >> BDRV_SECTOR_BITS; |
1581 |
if (len > 0) { |
1582 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1583 |
return ret;
|
1584 |
memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
|
1585 |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1586 |
return ret;
|
1587 |
count -= len; |
1588 |
if (count == 0) |
1589 |
return count1;
|
1590 |
sector_num++; |
1591 |
buf += len; |
1592 |
} |
1593 |
|
1594 |
/* write the sectors "in place" */
|
1595 |
nb_sectors = count >> BDRV_SECTOR_BITS; |
1596 |
if (nb_sectors > 0) { |
1597 |
if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
1598 |
return ret;
|
1599 |
sector_num += nb_sectors; |
1600 |
len = nb_sectors << BDRV_SECTOR_BITS; |
1601 |
buf += len; |
1602 |
count -= len; |
1603 |
} |
1604 |
|
1605 |
/* add data from the last sector */
|
1606 |
if (count > 0) { |
1607 |
if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1608 |
return ret;
|
1609 |
memcpy(tmp_buf, buf, count); |
1610 |
if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1611 |
return ret;
|
1612 |
} |
1613 |
return count1;
|
1614 |
} |
1615 |
|
1616 |
/*
|
1617 |
* Writes to the file and ensures that no writes are reordered across this
|
1618 |
* request (acts as a barrier)
|
1619 |
*
|
1620 |
* Returns 0 on success, -errno in error cases.
|
1621 |
*/
|
1622 |
int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
|
1623 |
const void *buf, int count) |
1624 |
{ |
1625 |
int ret;
|
1626 |
|
1627 |
ret = bdrv_pwrite(bs, offset, buf, count); |
1628 |
if (ret < 0) { |
1629 |
return ret;
|
1630 |
} |
1631 |
|
1632 |
/* No flush needed for cache modes that use O_DSYNC */
|
1633 |
if ((bs->open_flags & BDRV_O_CACHE_WB) != 0) { |
1634 |
bdrv_flush(bs); |
1635 |
} |
1636 |
|
1637 |
return 0; |
1638 |
} |
1639 |
|
1640 |
static int coroutine_fn bdrv_co_do_copy_on_readv(BlockDriverState *bs, |
1641 |
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
|
1642 |
{ |
1643 |
/* Perform I/O through a temporary buffer so that users who scribble over
|
1644 |
* their read buffer while the operation is in progress do not end up
|
1645 |
* modifying the image file. This is critical for zero-copy guest I/O
|
1646 |
* where anything might happen inside guest memory.
|
1647 |
*/
|
1648 |
void *bounce_buffer;
|
1649 |
|
1650 |
BlockDriver *drv = bs->drv; |
1651 |
struct iovec iov;
|
1652 |
QEMUIOVector bounce_qiov; |
1653 |
int64_t cluster_sector_num; |
1654 |
int cluster_nb_sectors;
|
1655 |
size_t skip_bytes; |
1656 |
int ret;
|
1657 |
|
1658 |
/* Cover entire cluster so no additional backing file I/O is required when
|
1659 |
* allocating cluster in the image file.
|
1660 |
*/
|
1661 |
round_to_clusters(bs, sector_num, nb_sectors, |
1662 |
&cluster_sector_num, &cluster_nb_sectors); |
1663 |
|
1664 |
trace_bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, |
1665 |
cluster_sector_num, cluster_nb_sectors); |
1666 |
|
1667 |
iov.iov_len = cluster_nb_sectors * BDRV_SECTOR_SIZE; |
1668 |
iov.iov_base = bounce_buffer = qemu_blockalign(bs, iov.iov_len); |
1669 |
qemu_iovec_init_external(&bounce_qiov, &iov, 1);
|
1670 |
|
1671 |
ret = drv->bdrv_co_readv(bs, cluster_sector_num, cluster_nb_sectors, |
1672 |
&bounce_qiov); |
1673 |
if (ret < 0) { |
1674 |
goto err;
|
1675 |
} |
1676 |
|
1677 |
if (drv->bdrv_co_write_zeroes &&
|
1678 |
buffer_is_zero(bounce_buffer, iov.iov_len)) { |
1679 |
ret = drv->bdrv_co_write_zeroes(bs, cluster_sector_num, |
1680 |
cluster_nb_sectors); |
1681 |
} else {
|
1682 |
ret = drv->bdrv_co_writev(bs, cluster_sector_num, cluster_nb_sectors, |
1683 |
&bounce_qiov); |
1684 |
} |
1685 |
|
1686 |
if (ret < 0) { |
1687 |
/* It might be okay to ignore write errors for guest requests. If this
|
1688 |
* is a deliberate copy-on-read then we don't want to ignore the error.
|
1689 |
* Simply report it in all cases.
|
1690 |
*/
|
1691 |
goto err;
|
1692 |
} |
1693 |
|
1694 |
skip_bytes = (sector_num - cluster_sector_num) * BDRV_SECTOR_SIZE; |
1695 |
qemu_iovec_from_buffer(qiov, bounce_buffer + skip_bytes, |
1696 |
nb_sectors * BDRV_SECTOR_SIZE); |
1697 |
|
1698 |
err:
|
1699 |
qemu_vfree(bounce_buffer); |
1700 |
return ret;
|
1701 |
} |
1702 |
|
1703 |
/*
|
1704 |
* Handle a read request in coroutine context
|
1705 |
*/
|
1706 |
static int coroutine_fn bdrv_co_do_readv(BlockDriverState *bs, |
1707 |
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
|
1708 |
BdrvRequestFlags flags) |
1709 |
{ |
1710 |
BlockDriver *drv = bs->drv; |
1711 |
BdrvTrackedRequest req; |
1712 |
int ret;
|
1713 |
|
1714 |
if (!drv) {
|
1715 |
return -ENOMEDIUM;
|
1716 |
} |
1717 |
if (bdrv_check_request(bs, sector_num, nb_sectors)) {
|
1718 |
return -EIO;
|
1719 |
} |
1720 |
|
1721 |
/* throttling disk read I/O */
|
1722 |
if (bs->io_limits_enabled) {
|
1723 |
bdrv_io_limits_intercept(bs, false, nb_sectors);
|
1724 |
} |
1725 |
|
1726 |
if (bs->copy_on_read) {
|
1727 |
flags |= BDRV_REQ_COPY_ON_READ; |
1728 |
} |
1729 |
if (flags & BDRV_REQ_COPY_ON_READ) {
|
1730 |
bs->copy_on_read_in_flight++; |
1731 |
} |
1732 |
|
1733 |
if (bs->copy_on_read_in_flight) {
|
1734 |
wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
1735 |
} |
1736 |
|
1737 |
tracked_request_begin(&req, bs, sector_num, nb_sectors, false);
|
1738 |
|
1739 |
if (flags & BDRV_REQ_COPY_ON_READ) {
|
1740 |
int pnum;
|
1741 |
|
1742 |
ret = bdrv_co_is_allocated(bs, sector_num, nb_sectors, &pnum); |
1743 |
if (ret < 0) { |
1744 |
goto out;
|
1745 |
} |
1746 |
|
1747 |
if (!ret || pnum != nb_sectors) {
|
1748 |
ret = bdrv_co_do_copy_on_readv(bs, sector_num, nb_sectors, qiov); |
1749 |
goto out;
|
1750 |
} |
1751 |
} |
1752 |
|
1753 |
ret = drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); |
1754 |
|
1755 |
out:
|
1756 |
tracked_request_end(&req); |
1757 |
|
1758 |
if (flags & BDRV_REQ_COPY_ON_READ) {
|
1759 |
bs->copy_on_read_in_flight--; |
1760 |
} |
1761 |
|
1762 |
return ret;
|
1763 |
} |
1764 |
|
1765 |
int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
|
1766 |
int nb_sectors, QEMUIOVector *qiov)
|
1767 |
{ |
1768 |
trace_bdrv_co_readv(bs, sector_num, nb_sectors); |
1769 |
|
1770 |
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0); |
1771 |
} |
1772 |
|
1773 |
int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
|
1774 |
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
|
1775 |
{ |
1776 |
trace_bdrv_co_copy_on_readv(bs, sector_num, nb_sectors); |
1777 |
|
1778 |
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov,
|
1779 |
BDRV_REQ_COPY_ON_READ); |
1780 |
} |
1781 |
|
1782 |
static int coroutine_fn bdrv_co_do_write_zeroes(BlockDriverState *bs, |
1783 |
int64_t sector_num, int nb_sectors)
|
1784 |
{ |
1785 |
BlockDriver *drv = bs->drv; |
1786 |
QEMUIOVector qiov; |
1787 |
struct iovec iov;
|
1788 |
int ret;
|
1789 |
|
1790 |
/* First try the efficient write zeroes operation */
|
1791 |
if (drv->bdrv_co_write_zeroes) {
|
1792 |
return drv->bdrv_co_write_zeroes(bs, sector_num, nb_sectors);
|
1793 |
} |
1794 |
|
1795 |
/* Fall back to bounce buffer if write zeroes is unsupported */
|
1796 |
iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
1797 |
iov.iov_base = qemu_blockalign(bs, iov.iov_len); |
1798 |
memset(iov.iov_base, 0, iov.iov_len);
|
1799 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
1800 |
|
1801 |
ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); |
1802 |
|
1803 |
qemu_vfree(iov.iov_base); |
1804 |
return ret;
|
1805 |
} |
1806 |
|
1807 |
/*
|
1808 |
* Handle a write request in coroutine context
|
1809 |
*/
|
1810 |
static int coroutine_fn bdrv_co_do_writev(BlockDriverState *bs, |
1811 |
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov,
|
1812 |
BdrvRequestFlags flags) |
1813 |
{ |
1814 |
BlockDriver *drv = bs->drv; |
1815 |
BdrvTrackedRequest req; |
1816 |
int ret;
|
1817 |
|
1818 |
if (!bs->drv) {
|
1819 |
return -ENOMEDIUM;
|
1820 |
} |
1821 |
if (bs->read_only) {
|
1822 |
return -EACCES;
|
1823 |
} |
1824 |
if (bdrv_check_request(bs, sector_num, nb_sectors)) {
|
1825 |
return -EIO;
|
1826 |
} |
1827 |
|
1828 |
/* throttling disk write I/O */
|
1829 |
if (bs->io_limits_enabled) {
|
1830 |
bdrv_io_limits_intercept(bs, true, nb_sectors);
|
1831 |
} |
1832 |
|
1833 |
if (bs->copy_on_read_in_flight) {
|
1834 |
wait_for_overlapping_requests(bs, sector_num, nb_sectors); |
1835 |
} |
1836 |
|
1837 |
tracked_request_begin(&req, bs, sector_num, nb_sectors, true);
|
1838 |
|
1839 |
if (flags & BDRV_REQ_ZERO_WRITE) {
|
1840 |
ret = bdrv_co_do_write_zeroes(bs, sector_num, nb_sectors); |
1841 |
} else {
|
1842 |
ret = drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); |
1843 |
} |
1844 |
|
1845 |
if (bs->dirty_bitmap) {
|
1846 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1847 |
} |
1848 |
|
1849 |
if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
1850 |
bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
1851 |
} |
1852 |
|
1853 |
tracked_request_end(&req); |
1854 |
|
1855 |
return ret;
|
1856 |
} |
1857 |
|
1858 |
int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
|
1859 |
int nb_sectors, QEMUIOVector *qiov)
|
1860 |
{ |
1861 |
trace_bdrv_co_writev(bs, sector_num, nb_sectors); |
1862 |
|
1863 |
return bdrv_co_do_writev(bs, sector_num, nb_sectors, qiov, 0); |
1864 |
} |
1865 |
|
1866 |
int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs,
|
1867 |
int64_t sector_num, int nb_sectors)
|
1868 |
{ |
1869 |
trace_bdrv_co_write_zeroes(bs, sector_num, nb_sectors); |
1870 |
|
1871 |
return bdrv_co_do_writev(bs, sector_num, nb_sectors, NULL, |
1872 |
BDRV_REQ_ZERO_WRITE); |
1873 |
} |
1874 |
|
1875 |
/**
|
1876 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
1877 |
*/
|
1878 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
1879 |
{ |
1880 |
BlockDriver *drv = bs->drv; |
1881 |
int ret;
|
1882 |
if (!drv)
|
1883 |
return -ENOMEDIUM;
|
1884 |
if (!drv->bdrv_truncate)
|
1885 |
return -ENOTSUP;
|
1886 |
if (bs->read_only)
|
1887 |
return -EACCES;
|
1888 |
if (bdrv_in_use(bs))
|
1889 |
return -EBUSY;
|
1890 |
ret = drv->bdrv_truncate(bs, offset); |
1891 |
if (ret == 0) { |
1892 |
ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
1893 |
bdrv_dev_resize_cb(bs); |
1894 |
} |
1895 |
return ret;
|
1896 |
} |
1897 |
|
1898 |
/**
|
1899 |
* Length of a allocated file in bytes. Sparse files are counted by actual
|
1900 |
* allocated space. Return < 0 if error or unknown.
|
1901 |
*/
|
1902 |
int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) |
1903 |
{ |
1904 |
BlockDriver *drv = bs->drv; |
1905 |
if (!drv) {
|
1906 |
return -ENOMEDIUM;
|
1907 |
} |
1908 |
if (drv->bdrv_get_allocated_file_size) {
|
1909 |
return drv->bdrv_get_allocated_file_size(bs);
|
1910 |
} |
1911 |
if (bs->file) {
|
1912 |
return bdrv_get_allocated_file_size(bs->file);
|
1913 |
} |
1914 |
return -ENOTSUP;
|
1915 |
} |
1916 |
|
1917 |
/**
|
1918 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
1919 |
*/
|
1920 |
int64_t bdrv_getlength(BlockDriverState *bs) |
1921 |
{ |
1922 |
BlockDriver *drv = bs->drv; |
1923 |
if (!drv)
|
1924 |
return -ENOMEDIUM;
|
1925 |
|
1926 |
if (bs->growable || bdrv_dev_has_removable_media(bs)) {
|
1927 |
if (drv->bdrv_getlength) {
|
1928 |
return drv->bdrv_getlength(bs);
|
1929 |
} |
1930 |
} |
1931 |
return bs->total_sectors * BDRV_SECTOR_SIZE;
|
1932 |
} |
1933 |
|
1934 |
/* return 0 as number of sectors if no device present or error */
|
1935 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
1936 |
{ |
1937 |
int64_t length; |
1938 |
length = bdrv_getlength(bs); |
1939 |
if (length < 0) |
1940 |
length = 0;
|
1941 |
else
|
1942 |
length = length >> BDRV_SECTOR_BITS; |
1943 |
*nb_sectors_ptr = length; |
1944 |
} |
1945 |
|
1946 |
struct partition {
|
1947 |
uint8_t boot_ind; /* 0x80 - active */
|
1948 |
uint8_t head; /* starting head */
|
1949 |
uint8_t sector; /* starting sector */
|
1950 |
uint8_t cyl; /* starting cylinder */
|
1951 |
uint8_t sys_ind; /* What partition type */
|
1952 |
uint8_t end_head; /* end head */
|
1953 |
uint8_t end_sector; /* end sector */
|
1954 |
uint8_t end_cyl; /* end cylinder */
|
1955 |
uint32_t start_sect; /* starting sector counting from 0 */
|
1956 |
uint32_t nr_sects; /* nr of sectors in partition */
|
1957 |
} QEMU_PACKED; |
1958 |
|
1959 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
1960 |
static int guess_disk_lchs(BlockDriverState *bs, |
1961 |
int *pcylinders, int *pheads, int *psectors) |
1962 |
{ |
1963 |
uint8_t buf[BDRV_SECTOR_SIZE]; |
1964 |
int ret, i, heads, sectors, cylinders;
|
1965 |
struct partition *p;
|
1966 |
uint32_t nr_sects; |
1967 |
uint64_t nb_sectors; |
1968 |
|
1969 |
bdrv_get_geometry(bs, &nb_sectors); |
1970 |
|
1971 |
ret = bdrv_read(bs, 0, buf, 1); |
1972 |
if (ret < 0) |
1973 |
return -1; |
1974 |
/* test msdos magic */
|
1975 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
1976 |
return -1; |
1977 |
for(i = 0; i < 4; i++) { |
1978 |
p = ((struct partition *)(buf + 0x1be)) + i; |
1979 |
nr_sects = le32_to_cpu(p->nr_sects); |
1980 |
if (nr_sects && p->end_head) {
|
1981 |
/* We make the assumption that the partition terminates on
|
1982 |
a cylinder boundary */
|
1983 |
heads = p->end_head + 1;
|
1984 |
sectors = p->end_sector & 63;
|
1985 |
if (sectors == 0) |
1986 |
continue;
|
1987 |
cylinders = nb_sectors / (heads * sectors); |
1988 |
if (cylinders < 1 || cylinders > 16383) |
1989 |
continue;
|
1990 |
*pheads = heads; |
1991 |
*psectors = sectors; |
1992 |
*pcylinders = cylinders; |
1993 |
#if 0
|
1994 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
1995 |
cylinders, heads, sectors);
|
1996 |
#endif
|
1997 |
return 0; |
1998 |
} |
1999 |
} |
2000 |
return -1; |
2001 |
} |
2002 |
|
2003 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
2004 |
{ |
2005 |
int translation, lba_detected = 0; |
2006 |
int cylinders, heads, secs;
|
2007 |
uint64_t nb_sectors; |
2008 |
|
2009 |
/* if a geometry hint is available, use it */
|
2010 |
bdrv_get_geometry(bs, &nb_sectors); |
2011 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
2012 |
translation = bdrv_get_translation_hint(bs); |
2013 |
if (cylinders != 0) { |
2014 |
*pcyls = cylinders; |
2015 |
*pheads = heads; |
2016 |
*psecs = secs; |
2017 |
} else {
|
2018 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
2019 |
if (heads > 16) { |
2020 |
/* if heads > 16, it means that a BIOS LBA
|
2021 |
translation was active, so the default
|
2022 |
hardware geometry is OK */
|
2023 |
lba_detected = 1;
|
2024 |
goto default_geometry;
|
2025 |
} else {
|
2026 |
*pcyls = cylinders; |
2027 |
*pheads = heads; |
2028 |
*psecs = secs; |
2029 |
/* disable any translation to be in sync with
|
2030 |
the logical geometry */
|
2031 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
2032 |
bdrv_set_translation_hint(bs, |
2033 |
BIOS_ATA_TRANSLATION_NONE); |
2034 |
} |
2035 |
} |
2036 |
} else {
|
2037 |
default_geometry:
|
2038 |
/* if no geometry, use a standard physical disk geometry */
|
2039 |
cylinders = nb_sectors / (16 * 63); |
2040 |
|
2041 |
if (cylinders > 16383) |
2042 |
cylinders = 16383;
|
2043 |
else if (cylinders < 2) |
2044 |
cylinders = 2;
|
2045 |
*pcyls = cylinders; |
2046 |
*pheads = 16;
|
2047 |
*psecs = 63;
|
2048 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
2049 |
if ((*pcyls * *pheads) <= 131072) { |
2050 |
bdrv_set_translation_hint(bs, |
2051 |
BIOS_ATA_TRANSLATION_LARGE); |
2052 |
} else {
|
2053 |
bdrv_set_translation_hint(bs, |
2054 |
BIOS_ATA_TRANSLATION_LBA); |
2055 |
} |
2056 |
} |
2057 |
} |
2058 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
2059 |
} |
2060 |
} |
2061 |
|
2062 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
2063 |
int cyls, int heads, int secs) |
2064 |
{ |
2065 |
bs->cyls = cyls; |
2066 |
bs->heads = heads; |
2067 |
bs->secs = secs; |
2068 |
} |
2069 |
|
2070 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
2071 |
{ |
2072 |
bs->translation = translation; |
2073 |
} |
2074 |
|
2075 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
2076 |
int *pcyls, int *pheads, int *psecs) |
2077 |
{ |
2078 |
*pcyls = bs->cyls; |
2079 |
*pheads = bs->heads; |
2080 |
*psecs = bs->secs; |
2081 |
} |
2082 |
|
2083 |
/* throttling disk io limits */
|
2084 |
void bdrv_set_io_limits(BlockDriverState *bs,
|
2085 |
BlockIOLimit *io_limits) |
2086 |
{ |
2087 |
bs->io_limits = *io_limits; |
2088 |
bs->io_limits_enabled = bdrv_io_limits_enabled(bs); |
2089 |
} |
2090 |
|
2091 |
/* Recognize floppy formats */
|
2092 |
typedef struct FDFormat { |
2093 |
FDriveType drive; |
2094 |
uint8_t last_sect; |
2095 |
uint8_t max_track; |
2096 |
uint8_t max_head; |
2097 |
FDriveRate rate; |
2098 |
} FDFormat; |
2099 |
|
2100 |
static const FDFormat fd_formats[] = { |
2101 |
/* First entry is default format */
|
2102 |
/* 1.44 MB 3"1/2 floppy disks */
|
2103 |
{ FDRIVE_DRV_144, 18, 80, 1, FDRIVE_RATE_500K, }, |
2104 |
{ FDRIVE_DRV_144, 20, 80, 1, FDRIVE_RATE_500K, }, |
2105 |
{ FDRIVE_DRV_144, 21, 80, 1, FDRIVE_RATE_500K, }, |
2106 |
{ FDRIVE_DRV_144, 21, 82, 1, FDRIVE_RATE_500K, }, |
2107 |
{ FDRIVE_DRV_144, 21, 83, 1, FDRIVE_RATE_500K, }, |
2108 |
{ FDRIVE_DRV_144, 22, 80, 1, FDRIVE_RATE_500K, }, |
2109 |
{ FDRIVE_DRV_144, 23, 80, 1, FDRIVE_RATE_500K, }, |
2110 |
{ FDRIVE_DRV_144, 24, 80, 1, FDRIVE_RATE_500K, }, |
2111 |
/* 2.88 MB 3"1/2 floppy disks */
|
2112 |
{ FDRIVE_DRV_288, 36, 80, 1, FDRIVE_RATE_1M, }, |
2113 |
{ FDRIVE_DRV_288, 39, 80, 1, FDRIVE_RATE_1M, }, |
2114 |
{ FDRIVE_DRV_288, 40, 80, 1, FDRIVE_RATE_1M, }, |
2115 |
{ FDRIVE_DRV_288, 44, 80, 1, FDRIVE_RATE_1M, }, |
2116 |
{ FDRIVE_DRV_288, 48, 80, 1, FDRIVE_RATE_1M, }, |
2117 |
/* 720 kB 3"1/2 floppy disks */
|
2118 |
{ FDRIVE_DRV_144, 9, 80, 1, FDRIVE_RATE_250K, }, |
2119 |
{ FDRIVE_DRV_144, 10, 80, 1, FDRIVE_RATE_250K, }, |
2120 |
{ FDRIVE_DRV_144, 10, 82, 1, FDRIVE_RATE_250K, }, |
2121 |
{ FDRIVE_DRV_144, 10, 83, 1, FDRIVE_RATE_250K, }, |
2122 |
{ FDRIVE_DRV_144, 13, 80, 1, FDRIVE_RATE_250K, }, |
2123 |
{ FDRIVE_DRV_144, 14, 80, 1, FDRIVE_RATE_250K, }, |
2124 |
/* 1.2 MB 5"1/4 floppy disks */
|
2125 |
{ FDRIVE_DRV_120, 15, 80, 1, FDRIVE_RATE_500K, }, |
2126 |
{ FDRIVE_DRV_120, 18, 80, 1, FDRIVE_RATE_500K, }, |
2127 |
{ FDRIVE_DRV_120, 18, 82, 1, FDRIVE_RATE_500K, }, |
2128 |
{ FDRIVE_DRV_120, 18, 83, 1, FDRIVE_RATE_500K, }, |
2129 |
{ FDRIVE_DRV_120, 20, 80, 1, FDRIVE_RATE_500K, }, |
2130 |
/* 720 kB 5"1/4 floppy disks */
|
2131 |
{ FDRIVE_DRV_120, 9, 80, 1, FDRIVE_RATE_250K, }, |
2132 |
{ FDRIVE_DRV_120, 11, 80, 1, FDRIVE_RATE_250K, }, |
2133 |
/* 360 kB 5"1/4 floppy disks */
|
2134 |
{ FDRIVE_DRV_120, 9, 40, 1, FDRIVE_RATE_300K, }, |
2135 |
{ FDRIVE_DRV_120, 9, 40, 0, FDRIVE_RATE_300K, }, |
2136 |
{ FDRIVE_DRV_120, 10, 41, 1, FDRIVE_RATE_300K, }, |
2137 |
{ FDRIVE_DRV_120, 10, 42, 1, FDRIVE_RATE_300K, }, |
2138 |
/* 320 kB 5"1/4 floppy disks */
|
2139 |
{ FDRIVE_DRV_120, 8, 40, 1, FDRIVE_RATE_250K, }, |
2140 |
{ FDRIVE_DRV_120, 8, 40, 0, FDRIVE_RATE_250K, }, |
2141 |
/* 360 kB must match 5"1/4 better than 3"1/2... */
|
2142 |
{ FDRIVE_DRV_144, 9, 80, 0, FDRIVE_RATE_250K, }, |
2143 |
/* end */
|
2144 |
{ FDRIVE_DRV_NONE, -1, -1, 0, 0, }, |
2145 |
}; |
2146 |
|
2147 |
void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, |
2148 |
int *max_track, int *last_sect, |
2149 |
FDriveType drive_in, FDriveType *drive, |
2150 |
FDriveRate *rate) |
2151 |
{ |
2152 |
const FDFormat *parse;
|
2153 |
uint64_t nb_sectors, size; |
2154 |
int i, first_match, match;
|
2155 |
|
2156 |
bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); |
2157 |
if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { |
2158 |
/* User defined disk */
|
2159 |
*rate = FDRIVE_RATE_500K; |
2160 |
} else {
|
2161 |
bdrv_get_geometry(bs, &nb_sectors); |
2162 |
match = -1;
|
2163 |
first_match = -1;
|
2164 |
for (i = 0; ; i++) { |
2165 |
parse = &fd_formats[i]; |
2166 |
if (parse->drive == FDRIVE_DRV_NONE) {
|
2167 |
break;
|
2168 |
} |
2169 |
if (drive_in == parse->drive ||
|
2170 |
drive_in == FDRIVE_DRV_NONE) { |
2171 |
size = (parse->max_head + 1) * parse->max_track *
|
2172 |
parse->last_sect; |
2173 |
if (nb_sectors == size) {
|
2174 |
match = i; |
2175 |
break;
|
2176 |
} |
2177 |
if (first_match == -1) { |
2178 |
first_match = i; |
2179 |
} |
2180 |
} |
2181 |
} |
2182 |
if (match == -1) { |
2183 |
if (first_match == -1) { |
2184 |
match = 1;
|
2185 |
} else {
|
2186 |
match = first_match; |
2187 |
} |
2188 |
parse = &fd_formats[match]; |
2189 |
} |
2190 |
*nb_heads = parse->max_head + 1;
|
2191 |
*max_track = parse->max_track; |
2192 |
*last_sect = parse->last_sect; |
2193 |
*drive = parse->drive; |
2194 |
*rate = parse->rate; |
2195 |
} |
2196 |
} |
2197 |
|
2198 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
2199 |
{ |
2200 |
return bs->translation;
|
2201 |
} |
2202 |
|
2203 |
void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
|
2204 |
BlockErrorAction on_write_error) |
2205 |
{ |
2206 |
bs->on_read_error = on_read_error; |
2207 |
bs->on_write_error = on_write_error; |
2208 |
} |
2209 |
|
2210 |
BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read)
|
2211 |
{ |
2212 |
return is_read ? bs->on_read_error : bs->on_write_error;
|
2213 |
} |
2214 |
|
2215 |
int bdrv_is_read_only(BlockDriverState *bs)
|
2216 |
{ |
2217 |
return bs->read_only;
|
2218 |
} |
2219 |
|
2220 |
int bdrv_is_sg(BlockDriverState *bs)
|
2221 |
{ |
2222 |
return bs->sg;
|
2223 |
} |
2224 |
|
2225 |
int bdrv_enable_write_cache(BlockDriverState *bs)
|
2226 |
{ |
2227 |
return bs->enable_write_cache;
|
2228 |
} |
2229 |
|
2230 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
2231 |
{ |
2232 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
2233 |
return 1; |
2234 |
return bs->encrypted;
|
2235 |
} |
2236 |
|
2237 |
int bdrv_key_required(BlockDriverState *bs)
|
2238 |
{ |
2239 |
BlockDriverState *backing_hd = bs->backing_hd; |
2240 |
|
2241 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
2242 |
return 1; |
2243 |
return (bs->encrypted && !bs->valid_key);
|
2244 |
} |
2245 |
|
2246 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
2247 |
{ |
2248 |
int ret;
|
2249 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
2250 |
ret = bdrv_set_key(bs->backing_hd, key); |
2251 |
if (ret < 0) |
2252 |
return ret;
|
2253 |
if (!bs->encrypted)
|
2254 |
return 0; |
2255 |
} |
2256 |
if (!bs->encrypted) {
|
2257 |
return -EINVAL;
|
2258 |
} else if (!bs->drv || !bs->drv->bdrv_set_key) { |
2259 |
return -ENOMEDIUM;
|
2260 |
} |
2261 |
ret = bs->drv->bdrv_set_key(bs, key); |
2262 |
if (ret < 0) { |
2263 |
bs->valid_key = 0;
|
2264 |
} else if (!bs->valid_key) { |
2265 |
bs->valid_key = 1;
|
2266 |
/* call the change callback now, we skipped it on open */
|
2267 |
bdrv_dev_change_media_cb(bs, true);
|
2268 |
} |
2269 |
return ret;
|
2270 |
} |
2271 |
|
2272 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
2273 |
{ |
2274 |
if (!bs->drv) {
|
2275 |
buf[0] = '\0'; |
2276 |
} else {
|
2277 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
2278 |
} |
2279 |
} |
2280 |
|
2281 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
2282 |
void *opaque)
|
2283 |
{ |
2284 |
BlockDriver *drv; |
2285 |
|
2286 |
QLIST_FOREACH(drv, &bdrv_drivers, list) { |
2287 |
it(opaque, drv->format_name); |
2288 |
} |
2289 |
} |
2290 |
|
2291 |
BlockDriverState *bdrv_find(const char *name) |
2292 |
{ |
2293 |
BlockDriverState *bs; |
2294 |
|
2295 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2296 |
if (!strcmp(name, bs->device_name)) {
|
2297 |
return bs;
|
2298 |
} |
2299 |
} |
2300 |
return NULL; |
2301 |
} |
2302 |
|
2303 |
BlockDriverState *bdrv_next(BlockDriverState *bs) |
2304 |
{ |
2305 |
if (!bs) {
|
2306 |
return QTAILQ_FIRST(&bdrv_states);
|
2307 |
} |
2308 |
return QTAILQ_NEXT(bs, list);
|
2309 |
} |
2310 |
|
2311 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
2312 |
{ |
2313 |
BlockDriverState *bs; |
2314 |
|
2315 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2316 |
it(opaque, bs); |
2317 |
} |
2318 |
} |
2319 |
|
2320 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
2321 |
{ |
2322 |
return bs->device_name;
|
2323 |
} |
2324 |
|
2325 |
void bdrv_flush_all(void) |
2326 |
{ |
2327 |
BlockDriverState *bs; |
2328 |
|
2329 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2330 |
if (!bdrv_is_read_only(bs) && bdrv_is_inserted(bs)) {
|
2331 |
bdrv_flush(bs); |
2332 |
} |
2333 |
} |
2334 |
} |
2335 |
|
2336 |
int bdrv_has_zero_init(BlockDriverState *bs)
|
2337 |
{ |
2338 |
assert(bs->drv); |
2339 |
|
2340 |
if (bs->drv->bdrv_has_zero_init) {
|
2341 |
return bs->drv->bdrv_has_zero_init(bs);
|
2342 |
} |
2343 |
|
2344 |
return 1; |
2345 |
} |
2346 |
|
2347 |
typedef struct BdrvCoIsAllocatedData { |
2348 |
BlockDriverState *bs; |
2349 |
int64_t sector_num; |
2350 |
int nb_sectors;
|
2351 |
int *pnum;
|
2352 |
int ret;
|
2353 |
bool done;
|
2354 |
} BdrvCoIsAllocatedData; |
2355 |
|
2356 |
/*
|
2357 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
2358 |
* not implementing the functionality are assumed to not support backing files,
|
2359 |
* hence all their sectors are reported as allocated.
|
2360 |
*
|
2361 |
* If 'sector_num' is beyond the end of the disk image the return value is 0
|
2362 |
* and 'pnum' is set to 0.
|
2363 |
*
|
2364 |
* 'pnum' is set to the number of sectors (including and immediately following
|
2365 |
* the specified sector) that are known to be in the same
|
2366 |
* allocated/unallocated state.
|
2367 |
*
|
2368 |
* 'nb_sectors' is the max value 'pnum' should be set to. If nb_sectors goes
|
2369 |
* beyond the end of the disk image it will be clamped.
|
2370 |
*/
|
2371 |
int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
|
2372 |
int nb_sectors, int *pnum) |
2373 |
{ |
2374 |
int64_t n; |
2375 |
|
2376 |
if (sector_num >= bs->total_sectors) {
|
2377 |
*pnum = 0;
|
2378 |
return 0; |
2379 |
} |
2380 |
|
2381 |
n = bs->total_sectors - sector_num; |
2382 |
if (n < nb_sectors) {
|
2383 |
nb_sectors = n; |
2384 |
} |
2385 |
|
2386 |
if (!bs->drv->bdrv_co_is_allocated) {
|
2387 |
*pnum = nb_sectors; |
2388 |
return 1; |
2389 |
} |
2390 |
|
2391 |
return bs->drv->bdrv_co_is_allocated(bs, sector_num, nb_sectors, pnum);
|
2392 |
} |
2393 |
|
2394 |
/* Coroutine wrapper for bdrv_is_allocated() */
|
2395 |
static void coroutine_fn bdrv_is_allocated_co_entry(void *opaque) |
2396 |
{ |
2397 |
BdrvCoIsAllocatedData *data = opaque; |
2398 |
BlockDriverState *bs = data->bs; |
2399 |
|
2400 |
data->ret = bdrv_co_is_allocated(bs, data->sector_num, data->nb_sectors, |
2401 |
data->pnum); |
2402 |
data->done = true;
|
2403 |
} |
2404 |
|
2405 |
/*
|
2406 |
* Synchronous wrapper around bdrv_co_is_allocated().
|
2407 |
*
|
2408 |
* See bdrv_co_is_allocated() for details.
|
2409 |
*/
|
2410 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
2411 |
int *pnum)
|
2412 |
{ |
2413 |
Coroutine *co; |
2414 |
BdrvCoIsAllocatedData data = { |
2415 |
.bs = bs, |
2416 |
.sector_num = sector_num, |
2417 |
.nb_sectors = nb_sectors, |
2418 |
.pnum = pnum, |
2419 |
.done = false,
|
2420 |
}; |
2421 |
|
2422 |
co = qemu_coroutine_create(bdrv_is_allocated_co_entry); |
2423 |
qemu_coroutine_enter(co, &data); |
2424 |
while (!data.done) {
|
2425 |
qemu_aio_wait(); |
2426 |
} |
2427 |
return data.ret;
|
2428 |
} |
2429 |
|
2430 |
BlockInfoList *qmp_query_block(Error **errp) |
2431 |
{ |
2432 |
BlockInfoList *head = NULL, *cur_item = NULL; |
2433 |
BlockDriverState *bs; |
2434 |
|
2435 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2436 |
BlockInfoList *info = g_malloc0(sizeof(*info));
|
2437 |
|
2438 |
info->value = g_malloc0(sizeof(*info->value));
|
2439 |
info->value->device = g_strdup(bs->device_name); |
2440 |
info->value->type = g_strdup("unknown");
|
2441 |
info->value->locked = bdrv_dev_is_medium_locked(bs); |
2442 |
info->value->removable = bdrv_dev_has_removable_media(bs); |
2443 |
|
2444 |
if (bdrv_dev_has_removable_media(bs)) {
|
2445 |
info->value->has_tray_open = true;
|
2446 |
info->value->tray_open = bdrv_dev_is_tray_open(bs); |
2447 |
} |
2448 |
|
2449 |
if (bdrv_iostatus_is_enabled(bs)) {
|
2450 |
info->value->has_io_status = true;
|
2451 |
info->value->io_status = bs->iostatus; |
2452 |
} |
2453 |
|
2454 |
if (bs->drv) {
|
2455 |
info->value->has_inserted = true;
|
2456 |
info->value->inserted = g_malloc0(sizeof(*info->value->inserted));
|
2457 |
info->value->inserted->file = g_strdup(bs->filename); |
2458 |
info->value->inserted->ro = bs->read_only; |
2459 |
info->value->inserted->drv = g_strdup(bs->drv->format_name); |
2460 |
info->value->inserted->encrypted = bs->encrypted; |
2461 |
if (bs->backing_file[0]) { |
2462 |
info->value->inserted->has_backing_file = true;
|
2463 |
info->value->inserted->backing_file = g_strdup(bs->backing_file); |
2464 |
} |
2465 |
|
2466 |
if (bs->io_limits_enabled) {
|
2467 |
info->value->inserted->bps = |
2468 |
bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; |
2469 |
info->value->inserted->bps_rd = |
2470 |
bs->io_limits.bps[BLOCK_IO_LIMIT_READ]; |
2471 |
info->value->inserted->bps_wr = |
2472 |
bs->io_limits.bps[BLOCK_IO_LIMIT_WRITE]; |
2473 |
info->value->inserted->iops = |
2474 |
bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; |
2475 |
info->value->inserted->iops_rd = |
2476 |
bs->io_limits.iops[BLOCK_IO_LIMIT_READ]; |
2477 |
info->value->inserted->iops_wr = |
2478 |
bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE]; |
2479 |
} |
2480 |
} |
2481 |
|
2482 |
/* XXX: waiting for the qapi to support GSList */
|
2483 |
if (!cur_item) {
|
2484 |
head = cur_item = info; |
2485 |
} else {
|
2486 |
cur_item->next = info; |
2487 |
cur_item = info; |
2488 |
} |
2489 |
} |
2490 |
|
2491 |
return head;
|
2492 |
} |
2493 |
|
2494 |
/* Consider exposing this as a full fledged QMP command */
|
2495 |
static BlockStats *qmp_query_blockstat(const BlockDriverState *bs, Error **errp) |
2496 |
{ |
2497 |
BlockStats *s; |
2498 |
|
2499 |
s = g_malloc0(sizeof(*s));
|
2500 |
|
2501 |
if (bs->device_name[0]) { |
2502 |
s->has_device = true;
|
2503 |
s->device = g_strdup(bs->device_name); |
2504 |
} |
2505 |
|
2506 |
s->stats = g_malloc0(sizeof(*s->stats));
|
2507 |
s->stats->rd_bytes = bs->nr_bytes[BDRV_ACCT_READ]; |
2508 |
s->stats->wr_bytes = bs->nr_bytes[BDRV_ACCT_WRITE]; |
2509 |
s->stats->rd_operations = bs->nr_ops[BDRV_ACCT_READ]; |
2510 |
s->stats->wr_operations = bs->nr_ops[BDRV_ACCT_WRITE]; |
2511 |
s->stats->wr_highest_offset = bs->wr_highest_sector * BDRV_SECTOR_SIZE; |
2512 |
s->stats->flush_operations = bs->nr_ops[BDRV_ACCT_FLUSH]; |
2513 |
s->stats->wr_total_time_ns = bs->total_time_ns[BDRV_ACCT_WRITE]; |
2514 |
s->stats->rd_total_time_ns = bs->total_time_ns[BDRV_ACCT_READ]; |
2515 |
s->stats->flush_total_time_ns = bs->total_time_ns[BDRV_ACCT_FLUSH]; |
2516 |
|
2517 |
if (bs->file) {
|
2518 |
s->has_parent = true;
|
2519 |
s->parent = qmp_query_blockstat(bs->file, NULL);
|
2520 |
} |
2521 |
|
2522 |
return s;
|
2523 |
} |
2524 |
|
2525 |
BlockStatsList *qmp_query_blockstats(Error **errp) |
2526 |
{ |
2527 |
BlockStatsList *head = NULL, *cur_item = NULL; |
2528 |
BlockDriverState *bs; |
2529 |
|
2530 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
2531 |
BlockStatsList *info = g_malloc0(sizeof(*info));
|
2532 |
info->value = qmp_query_blockstat(bs, NULL);
|
2533 |
|
2534 |
/* XXX: waiting for the qapi to support GSList */
|
2535 |
if (!cur_item) {
|
2536 |
head = cur_item = info; |
2537 |
} else {
|
2538 |
cur_item->next = info; |
2539 |
cur_item = info; |
2540 |
} |
2541 |
} |
2542 |
|
2543 |
return head;
|
2544 |
} |
2545 |
|
2546 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
2547 |
{ |
2548 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
2549 |
return bs->backing_file;
|
2550 |
else if (bs->encrypted) |
2551 |
return bs->filename;
|
2552 |
else
|
2553 |
return NULL; |
2554 |
} |
2555 |
|
2556 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
2557 |
char *filename, int filename_size) |
2558 |
{ |
2559 |
pstrcpy(filename, filename_size, bs->backing_file); |
2560 |
} |
2561 |
|
2562 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
2563 |
const uint8_t *buf, int nb_sectors) |
2564 |
{ |
2565 |
BlockDriver *drv = bs->drv; |
2566 |
if (!drv)
|
2567 |
return -ENOMEDIUM;
|
2568 |
if (!drv->bdrv_write_compressed)
|
2569 |
return -ENOTSUP;
|
2570 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
2571 |
return -EIO;
|
2572 |
|
2573 |
if (bs->dirty_bitmap) {
|
2574 |
set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
2575 |
} |
2576 |
|
2577 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
2578 |
} |
2579 |
|
2580 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
2581 |
{ |
2582 |
BlockDriver *drv = bs->drv; |
2583 |
if (!drv)
|
2584 |
return -ENOMEDIUM;
|
2585 |
if (!drv->bdrv_get_info)
|
2586 |
return -ENOTSUP;
|
2587 |
memset(bdi, 0, sizeof(*bdi)); |
2588 |
return drv->bdrv_get_info(bs, bdi);
|
2589 |
} |
2590 |
|
2591 |
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
2592 |
int64_t pos, int size)
|
2593 |
{ |
2594 |
BlockDriver *drv = bs->drv; |
2595 |
if (!drv)
|
2596 |
return -ENOMEDIUM;
|
2597 |
if (drv->bdrv_save_vmstate)
|
2598 |
return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
2599 |
if (bs->file)
|
2600 |
return bdrv_save_vmstate(bs->file, buf, pos, size);
|
2601 |
return -ENOTSUP;
|
2602 |
} |
2603 |
|
2604 |
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
2605 |
int64_t pos, int size)
|
2606 |
{ |
2607 |
BlockDriver *drv = bs->drv; |
2608 |
if (!drv)
|
2609 |
return -ENOMEDIUM;
|
2610 |
if (drv->bdrv_load_vmstate)
|
2611 |
return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
2612 |
if (bs->file)
|
2613 |
return bdrv_load_vmstate(bs->file, buf, pos, size);
|
2614 |
return -ENOTSUP;
|
2615 |
} |
2616 |
|
2617 |
void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
|
2618 |
{ |
2619 |
BlockDriver *drv = bs->drv; |
2620 |
|
2621 |
if (!drv || !drv->bdrv_debug_event) {
|
2622 |
return;
|
2623 |
} |
2624 |
|
2625 |
return drv->bdrv_debug_event(bs, event);
|
2626 |
|
2627 |
} |
2628 |
|
2629 |
/**************************************************************/
|
2630 |
/* handling of snapshots */
|
2631 |
|
2632 |
int bdrv_can_snapshot(BlockDriverState *bs)
|
2633 |
{ |
2634 |
BlockDriver *drv = bs->drv; |
2635 |
if (!drv || !bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
|
2636 |
return 0; |
2637 |
} |
2638 |
|
2639 |
if (!drv->bdrv_snapshot_create) {
|
2640 |
if (bs->file != NULL) { |
2641 |
return bdrv_can_snapshot(bs->file);
|
2642 |
} |
2643 |
return 0; |
2644 |
} |
2645 |
|
2646 |
return 1; |
2647 |
} |
2648 |
|
2649 |
int bdrv_is_snapshot(BlockDriverState *bs)
|
2650 |
{ |
2651 |
return !!(bs->open_flags & BDRV_O_SNAPSHOT);
|
2652 |
} |
2653 |
|
2654 |
BlockDriverState *bdrv_snapshots(void)
|
2655 |
{ |
2656 |
BlockDriverState *bs; |
2657 |
|
2658 |
if (bs_snapshots) {
|
2659 |
return bs_snapshots;
|
2660 |
} |
2661 |
|
2662 |
bs = NULL;
|
2663 |
while ((bs = bdrv_next(bs))) {
|
2664 |
if (bdrv_can_snapshot(bs)) {
|
2665 |
bs_snapshots = bs; |
2666 |
return bs;
|
2667 |
} |
2668 |
} |
2669 |
return NULL; |
2670 |
} |
2671 |
|
2672 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
2673 |
QEMUSnapshotInfo *sn_info) |
2674 |
{ |
2675 |
BlockDriver *drv = bs->drv; |
2676 |
if (!drv)
|
2677 |
return -ENOMEDIUM;
|
2678 |
if (drv->bdrv_snapshot_create)
|
2679 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
2680 |
if (bs->file)
|
2681 |
return bdrv_snapshot_create(bs->file, sn_info);
|
2682 |
return -ENOTSUP;
|
2683 |
} |
2684 |
|
2685 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
2686 |
const char *snapshot_id) |
2687 |
{ |
2688 |
BlockDriver *drv = bs->drv; |
2689 |
int ret, open_ret;
|
2690 |
|
2691 |
if (!drv)
|
2692 |
return -ENOMEDIUM;
|
2693 |
if (drv->bdrv_snapshot_goto)
|
2694 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
2695 |
|
2696 |
if (bs->file) {
|
2697 |
drv->bdrv_close(bs); |
2698 |
ret = bdrv_snapshot_goto(bs->file, snapshot_id); |
2699 |
open_ret = drv->bdrv_open(bs, bs->open_flags); |
2700 |
if (open_ret < 0) { |
2701 |
bdrv_delete(bs->file); |
2702 |
bs->drv = NULL;
|
2703 |
return open_ret;
|
2704 |
} |
2705 |
return ret;
|
2706 |
} |
2707 |
|
2708 |
return -ENOTSUP;
|
2709 |
} |
2710 |
|
2711 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
2712 |
{ |
2713 |
BlockDriver *drv = bs->drv; |
2714 |
if (!drv)
|
2715 |
return -ENOMEDIUM;
|
2716 |
if (drv->bdrv_snapshot_delete)
|
2717 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
2718 |
if (bs->file)
|
2719 |
return bdrv_snapshot_delete(bs->file, snapshot_id);
|
2720 |
return -ENOTSUP;
|
2721 |
} |
2722 |
|
2723 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
2724 |
QEMUSnapshotInfo **psn_info) |
2725 |
{ |
2726 |
BlockDriver *drv = bs->drv; |
2727 |
if (!drv)
|
2728 |
return -ENOMEDIUM;
|
2729 |
if (drv->bdrv_snapshot_list)
|
2730 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
2731 |
if (bs->file)
|
2732 |
return bdrv_snapshot_list(bs->file, psn_info);
|
2733 |
return -ENOTSUP;
|
2734 |
} |
2735 |
|
2736 |
int bdrv_snapshot_load_tmp(BlockDriverState *bs,
|
2737 |
const char *snapshot_name) |
2738 |
{ |
2739 |
BlockDriver *drv = bs->drv; |
2740 |
if (!drv) {
|
2741 |
return -ENOMEDIUM;
|
2742 |
} |
2743 |
if (!bs->read_only) {
|
2744 |
return -EINVAL;
|
2745 |
} |
2746 |
if (drv->bdrv_snapshot_load_tmp) {
|
2747 |
return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
|
2748 |
} |
2749 |
return -ENOTSUP;
|
2750 |
} |
2751 |
|
2752 |
BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs, |
2753 |
const char *backing_file) |
2754 |
{ |
2755 |
if (!bs->drv) {
|
2756 |
return NULL; |
2757 |
} |
2758 |
|
2759 |
if (bs->backing_hd) {
|
2760 |
if (strcmp(bs->backing_file, backing_file) == 0) { |
2761 |
return bs->backing_hd;
|
2762 |
} else {
|
2763 |
return bdrv_find_backing_image(bs->backing_hd, backing_file);
|
2764 |
} |
2765 |
} |
2766 |
|
2767 |
return NULL; |
2768 |
} |
2769 |
|
2770 |
#define NB_SUFFIXES 4 |
2771 |
|
2772 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
2773 |
{ |
2774 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
2775 |
int64_t base; |
2776 |
int i;
|
2777 |
|
2778 |
if (size <= 999) { |
2779 |
snprintf(buf, buf_size, "%" PRId64, size);
|
2780 |
} else {
|
2781 |
base = 1024;
|
2782 |
for(i = 0; i < NB_SUFFIXES; i++) { |
2783 |
if (size < (10 * base)) { |
2784 |
snprintf(buf, buf_size, "%0.1f%c",
|
2785 |
(double)size / base,
|
2786 |
suffixes[i]); |
2787 |
break;
|
2788 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
2789 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
2790 |
((size + (base >> 1)) / base),
|
2791 |
suffixes[i]); |
2792 |
break;
|
2793 |
} |
2794 |
base = base * 1024;
|
2795 |
} |
2796 |
} |
2797 |
return buf;
|
2798 |
} |
2799 |
|
2800 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
2801 |
{ |
2802 |
char buf1[128], date_buf[128], clock_buf[128]; |
2803 |
#ifdef _WIN32
|
2804 |
struct tm *ptm;
|
2805 |
#else
|
2806 |
struct tm tm;
|
2807 |
#endif
|
2808 |
time_t ti; |
2809 |
int64_t secs; |
2810 |
|
2811 |
if (!sn) {
|
2812 |
snprintf(buf, buf_size, |
2813 |
"%-10s%-20s%7s%20s%15s",
|
2814 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
2815 |
} else {
|
2816 |
ti = sn->date_sec; |
2817 |
#ifdef _WIN32
|
2818 |
ptm = localtime(&ti); |
2819 |
strftime(date_buf, sizeof(date_buf),
|
2820 |
"%Y-%m-%d %H:%M:%S", ptm);
|
2821 |
#else
|
2822 |
localtime_r(&ti, &tm); |
2823 |
strftime(date_buf, sizeof(date_buf),
|
2824 |
"%Y-%m-%d %H:%M:%S", &tm);
|
2825 |
#endif
|
2826 |
secs = sn->vm_clock_nsec / 1000000000;
|
2827 |
snprintf(clock_buf, sizeof(clock_buf),
|
2828 |
"%02d:%02d:%02d.%03d",
|
2829 |
(int)(secs / 3600), |
2830 |
(int)((secs / 60) % 60), |
2831 |
(int)(secs % 60), |
2832 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
2833 |
snprintf(buf, buf_size, |
2834 |
"%-10s%-20s%7s%20s%15s",
|
2835 |
sn->id_str, sn->name, |
2836 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
2837 |
date_buf, |
2838 |
clock_buf); |
2839 |
} |
2840 |
return buf;
|
2841 |
} |
2842 |
|
2843 |
/**************************************************************/
|
2844 |
/* async I/Os */
|
2845 |
|
2846 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
2847 |
QEMUIOVector *qiov, int nb_sectors,
|
2848 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2849 |
{ |
2850 |
trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
2851 |
|
2852 |
return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors,
|
2853 |
cb, opaque, false);
|
2854 |
} |
2855 |
|
2856 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
2857 |
QEMUIOVector *qiov, int nb_sectors,
|
2858 |
BlockDriverCompletionFunc *cb, void *opaque)
|
2859 |
{ |
2860 |
trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
2861 |
|
2862 |
return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors,
|
2863 |
cb, opaque, true);
|
2864 |
} |
2865 |
|
2866 |
|
2867 |
typedef struct MultiwriteCB { |
2868 |
int error;
|
2869 |
int num_requests;
|
2870 |
int num_callbacks;
|
2871 |
struct {
|
2872 |
BlockDriverCompletionFunc *cb; |
2873 |
void *opaque;
|
2874 |
QEMUIOVector *free_qiov; |
2875 |
} callbacks[]; |
2876 |
} MultiwriteCB; |
2877 |
|
2878 |
static void multiwrite_user_cb(MultiwriteCB *mcb) |
2879 |
{ |
2880 |
int i;
|
2881 |
|
2882 |
for (i = 0; i < mcb->num_callbacks; i++) { |
2883 |
mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
2884 |
if (mcb->callbacks[i].free_qiov) {
|
2885 |
qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
2886 |
} |
2887 |
g_free(mcb->callbacks[i].free_qiov); |
2888 |
} |
2889 |
} |
2890 |
|
2891 |
static void multiwrite_cb(void *opaque, int ret) |
2892 |
{ |
2893 |
MultiwriteCB *mcb = opaque; |
2894 |
|
2895 |
trace_multiwrite_cb(mcb, ret); |
2896 |
|
2897 |
if (ret < 0 && !mcb->error) { |
2898 |
mcb->error = ret; |
2899 |
} |
2900 |
|
2901 |
mcb->num_requests--; |
2902 |
if (mcb->num_requests == 0) { |
2903 |
multiwrite_user_cb(mcb); |
2904 |
g_free(mcb); |
2905 |
} |
2906 |
} |
2907 |
|
2908 |
static int multiwrite_req_compare(const void *a, const void *b) |
2909 |
{ |
2910 |
const BlockRequest *req1 = a, *req2 = b;
|
2911 |
|
2912 |
/*
|
2913 |
* Note that we can't simply subtract req2->sector from req1->sector
|
2914 |
* here as that could overflow the return value.
|
2915 |
*/
|
2916 |
if (req1->sector > req2->sector) {
|
2917 |
return 1; |
2918 |
} else if (req1->sector < req2->sector) { |
2919 |
return -1; |
2920 |
} else {
|
2921 |
return 0; |
2922 |
} |
2923 |
} |
2924 |
|
2925 |
/*
|
2926 |
* Takes a bunch of requests and tries to merge them. Returns the number of
|
2927 |
* requests that remain after merging.
|
2928 |
*/
|
2929 |
static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
2930 |
int num_reqs, MultiwriteCB *mcb)
|
2931 |
{ |
2932 |
int i, outidx;
|
2933 |
|
2934 |
// Sort requests by start sector
|
2935 |
qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
2936 |
|
2937 |
// Check if adjacent requests touch the same clusters. If so, combine them,
|
2938 |
// filling up gaps with zero sectors.
|
2939 |
outidx = 0;
|
2940 |
for (i = 1; i < num_reqs; i++) { |
2941 |
int merge = 0; |
2942 |
int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
2943 |
|
2944 |
// Handle exactly sequential writes and overlapping writes.
|
2945 |
if (reqs[i].sector <= oldreq_last) {
|
2946 |
merge = 1;
|
2947 |
} |
2948 |
|
2949 |
if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
2950 |
merge = 0;
|
2951 |
} |
2952 |
|
2953 |
if (merge) {
|
2954 |
size_t size; |
2955 |
QEMUIOVector *qiov = g_malloc0(sizeof(*qiov));
|
2956 |
qemu_iovec_init(qiov, |
2957 |
reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
2958 |
|
2959 |
// Add the first request to the merged one. If the requests are
|
2960 |
// overlapping, drop the last sectors of the first request.
|
2961 |
size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
2962 |
qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
2963 |
|
2964 |
// We should need to add any zeros between the two requests
|
2965 |
assert (reqs[i].sector <= oldreq_last); |
2966 |
|
2967 |
// Add the second request
|
2968 |
qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
2969 |
|
2970 |
reqs[outidx].nb_sectors = qiov->size >> 9;
|
2971 |
reqs[outidx].qiov = qiov; |
2972 |
|
2973 |
mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
2974 |
} else {
|
2975 |
outidx++; |
2976 |
reqs[outidx].sector = reqs[i].sector; |
2977 |
reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
2978 |
reqs[outidx].qiov = reqs[i].qiov; |
2979 |
} |
2980 |
} |
2981 |
|
2982 |
return outidx + 1; |
2983 |
} |
2984 |
|
2985 |
/*
|
2986 |
* Submit multiple AIO write requests at once.
|
2987 |
*
|
2988 |
* On success, the function returns 0 and all requests in the reqs array have
|
2989 |
* been submitted. In error case this function returns -1, and any of the
|
2990 |
* requests may or may not be submitted yet. In particular, this means that the
|
2991 |
* callback will be called for some of the requests, for others it won't. The
|
2992 |
* caller must check the error field of the BlockRequest to wait for the right
|
2993 |
* callbacks (if error != 0, no callback will be called).
|
2994 |
*
|
2995 |
* The implementation may modify the contents of the reqs array, e.g. to merge
|
2996 |
* requests. However, the fields opaque and error are left unmodified as they
|
2997 |
* are used to signal failure for a single request to the caller.
|
2998 |
*/
|
2999 |
int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
3000 |
{ |
3001 |
MultiwriteCB *mcb; |
3002 |
int i;
|
3003 |
|
3004 |
/* don't submit writes if we don't have a medium */
|
3005 |
if (bs->drv == NULL) { |
3006 |
for (i = 0; i < num_reqs; i++) { |
3007 |
reqs[i].error = -ENOMEDIUM; |
3008 |
} |
3009 |
return -1; |
3010 |
} |
3011 |
|
3012 |
if (num_reqs == 0) { |
3013 |
return 0; |
3014 |
} |
3015 |
|
3016 |
// Create MultiwriteCB structure
|
3017 |
mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
3018 |
mcb->num_requests = 0;
|
3019 |
mcb->num_callbacks = num_reqs; |
3020 |
|
3021 |
for (i = 0; i < num_reqs; i++) { |
3022 |
mcb->callbacks[i].cb = reqs[i].cb; |
3023 |
mcb->callbacks[i].opaque = reqs[i].opaque; |
3024 |
} |
3025 |
|
3026 |
// Check for mergable requests
|
3027 |
num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
3028 |
|
3029 |
trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
3030 |
|
3031 |
/* Run the aio requests. */
|
3032 |
mcb->num_requests = num_reqs; |
3033 |
for (i = 0; i < num_reqs; i++) { |
3034 |
bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
3035 |
reqs[i].nb_sectors, multiwrite_cb, mcb); |
3036 |
} |
3037 |
|
3038 |
return 0; |
3039 |
} |
3040 |
|
3041 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
3042 |
{ |
3043 |
acb->pool->cancel(acb); |
3044 |
} |
3045 |
|
3046 |
/* block I/O throttling */
|
3047 |
static bool bdrv_exceed_bps_limits(BlockDriverState *bs, int nb_sectors, |
3048 |
bool is_write, double elapsed_time, uint64_t *wait) |
3049 |
{ |
3050 |
uint64_t bps_limit = 0;
|
3051 |
double bytes_limit, bytes_base, bytes_res;
|
3052 |
double slice_time, wait_time;
|
3053 |
|
3054 |
if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) {
|
3055 |
bps_limit = bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]; |
3056 |
} else if (bs->io_limits.bps[is_write]) { |
3057 |
bps_limit = bs->io_limits.bps[is_write]; |
3058 |
} else {
|
3059 |
if (wait) {
|
3060 |
*wait = 0;
|
3061 |
} |
3062 |
|
3063 |
return false; |
3064 |
} |
3065 |
|
3066 |
slice_time = bs->slice_end - bs->slice_start; |
3067 |
slice_time /= (NANOSECONDS_PER_SECOND); |
3068 |
bytes_limit = bps_limit * slice_time; |
3069 |
bytes_base = bs->nr_bytes[is_write] - bs->io_base.bytes[is_write]; |
3070 |
if (bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL]) {
|
3071 |
bytes_base += bs->nr_bytes[!is_write] - bs->io_base.bytes[!is_write]; |
3072 |
} |
3073 |
|
3074 |
/* bytes_base: the bytes of data which have been read/written; and
|
3075 |
* it is obtained from the history statistic info.
|
3076 |
* bytes_res: the remaining bytes of data which need to be read/written.
|
3077 |
* (bytes_base + bytes_res) / bps_limit: used to calcuate
|
3078 |
* the total time for completing reading/writting all data.
|
3079 |
*/
|
3080 |
bytes_res = (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
3081 |
|
3082 |
if (bytes_base + bytes_res <= bytes_limit) {
|
3083 |
if (wait) {
|
3084 |
*wait = 0;
|
3085 |
} |
3086 |
|
3087 |
return false; |
3088 |
} |
3089 |
|
3090 |
/* Calc approx time to dispatch */
|
3091 |
wait_time = (bytes_base + bytes_res) / bps_limit - elapsed_time; |
3092 |
|
3093 |
/* When the I/O rate at runtime exceeds the limits,
|
3094 |
* bs->slice_end need to be extended in order that the current statistic
|
3095 |
* info can be kept until the timer fire, so it is increased and tuned
|
3096 |
* based on the result of experiment.
|
3097 |
*/
|
3098 |
bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
3099 |
bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME;
|
3100 |
if (wait) {
|
3101 |
*wait = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
3102 |
} |
3103 |
|
3104 |
return true; |
3105 |
} |
3106 |
|
3107 |
static bool bdrv_exceed_iops_limits(BlockDriverState *bs, bool is_write, |
3108 |
double elapsed_time, uint64_t *wait)
|
3109 |
{ |
3110 |
uint64_t iops_limit = 0;
|
3111 |
double ios_limit, ios_base;
|
3112 |
double slice_time, wait_time;
|
3113 |
|
3114 |
if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) {
|
3115 |
iops_limit = bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]; |
3116 |
} else if (bs->io_limits.iops[is_write]) { |
3117 |
iops_limit = bs->io_limits.iops[is_write]; |
3118 |
} else {
|
3119 |
if (wait) {
|
3120 |
*wait = 0;
|
3121 |
} |
3122 |
|
3123 |
return false; |
3124 |
} |
3125 |
|
3126 |
slice_time = bs->slice_end - bs->slice_start; |
3127 |
slice_time /= (NANOSECONDS_PER_SECOND); |
3128 |
ios_limit = iops_limit * slice_time; |
3129 |
ios_base = bs->nr_ops[is_write] - bs->io_base.ios[is_write]; |
3130 |
if (bs->io_limits.iops[BLOCK_IO_LIMIT_TOTAL]) {
|
3131 |
ios_base += bs->nr_ops[!is_write] - bs->io_base.ios[!is_write]; |
3132 |
} |
3133 |
|
3134 |
if (ios_base + 1 <= ios_limit) { |
3135 |
if (wait) {
|
3136 |
*wait = 0;
|
3137 |
} |
3138 |
|
3139 |
return false; |
3140 |
} |
3141 |
|
3142 |
/* Calc approx time to dispatch */
|
3143 |
wait_time = (ios_base + 1) / iops_limit;
|
3144 |
if (wait_time > elapsed_time) {
|
3145 |
wait_time = wait_time - elapsed_time; |
3146 |
} else {
|
3147 |
wait_time = 0;
|
3148 |
} |
3149 |
|
3150 |
bs->slice_time = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
3151 |
bs->slice_end += bs->slice_time - 3 * BLOCK_IO_SLICE_TIME;
|
3152 |
if (wait) {
|
3153 |
*wait = wait_time * BLOCK_IO_SLICE_TIME * 10;
|
3154 |
} |
3155 |
|
3156 |
return true; |
3157 |
} |
3158 |
|
3159 |
static bool bdrv_exceed_io_limits(BlockDriverState *bs, int nb_sectors, |
3160 |
bool is_write, int64_t *wait)
|
3161 |
{ |
3162 |
int64_t now, max_wait; |
3163 |
uint64_t bps_wait = 0, iops_wait = 0; |
3164 |
double elapsed_time;
|
3165 |
int bps_ret, iops_ret;
|
3166 |
|
3167 |
now = qemu_get_clock_ns(vm_clock); |
3168 |
if ((bs->slice_start < now)
|
3169 |
&& (bs->slice_end > now)) { |
3170 |
bs->slice_end = now + bs->slice_time; |
3171 |
} else {
|
3172 |
bs->slice_time = 5 * BLOCK_IO_SLICE_TIME;
|
3173 |
bs->slice_start = now; |
3174 |
bs->slice_end = now + bs->slice_time; |
3175 |
|
3176 |
bs->io_base.bytes[is_write] = bs->nr_bytes[is_write]; |
3177 |
bs->io_base.bytes[!is_write] = bs->nr_bytes[!is_write]; |
3178 |
|
3179 |
bs->io_base.ios[is_write] = bs->nr_ops[is_write]; |
3180 |
bs->io_base.ios[!is_write] = bs->nr_ops[!is_write]; |
3181 |
} |
3182 |
|
3183 |
elapsed_time = now - bs->slice_start; |
3184 |
elapsed_time /= (NANOSECONDS_PER_SECOND); |
3185 |
|
3186 |
bps_ret = bdrv_exceed_bps_limits(bs, nb_sectors, |
3187 |
is_write, elapsed_time, &bps_wait); |
3188 |
iops_ret = bdrv_exceed_iops_limits(bs, is_write, |
3189 |
elapsed_time, &iops_wait); |
3190 |
if (bps_ret || iops_ret) {
|
3191 |
max_wait = bps_wait > iops_wait ? bps_wait : iops_wait; |
3192 |
if (wait) {
|
3193 |
*wait = max_wait; |
3194 |
} |
3195 |
|
3196 |
now = qemu_get_clock_ns(vm_clock); |
3197 |
if (bs->slice_end < now + max_wait) {
|
3198 |
bs->slice_end = now + max_wait; |
3199 |
} |
3200 |
|
3201 |
return true; |
3202 |
} |
3203 |
|
3204 |
if (wait) {
|
3205 |
*wait = 0;
|
3206 |
} |
3207 |
|
3208 |
return false; |
3209 |
} |
3210 |
|
3211 |
/**************************************************************/
|
3212 |
/* async block device emulation */
|
3213 |
|
3214 |
typedef struct BlockDriverAIOCBSync { |
3215 |
BlockDriverAIOCB common; |
3216 |
QEMUBH *bh; |
3217 |
int ret;
|
3218 |
/* vector translation state */
|
3219 |
QEMUIOVector *qiov; |
3220 |
uint8_t *bounce; |
3221 |
int is_write;
|
3222 |
} BlockDriverAIOCBSync; |
3223 |
|
3224 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
3225 |
{ |
3226 |
BlockDriverAIOCBSync *acb = |
3227 |
container_of(blockacb, BlockDriverAIOCBSync, common); |
3228 |
qemu_bh_delete(acb->bh); |
3229 |
acb->bh = NULL;
|
3230 |
qemu_aio_release(acb); |
3231 |
} |
3232 |
|
3233 |
static AIOPool bdrv_em_aio_pool = {
|
3234 |
.aiocb_size = sizeof(BlockDriverAIOCBSync),
|
3235 |
.cancel = bdrv_aio_cancel_em, |
3236 |
}; |
3237 |
|
3238 |
static void bdrv_aio_bh_cb(void *opaque) |
3239 |
{ |
3240 |
BlockDriverAIOCBSync *acb = opaque; |
3241 |
|
3242 |
if (!acb->is_write)
|
3243 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
3244 |
qemu_vfree(acb->bounce); |
3245 |
acb->common.cb(acb->common.opaque, acb->ret); |
3246 |
qemu_bh_delete(acb->bh); |
3247 |
acb->bh = NULL;
|
3248 |
qemu_aio_release(acb); |
3249 |
} |
3250 |
|
3251 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
3252 |
int64_t sector_num, |
3253 |
QEMUIOVector *qiov, |
3254 |
int nb_sectors,
|
3255 |
BlockDriverCompletionFunc *cb, |
3256 |
void *opaque,
|
3257 |
int is_write)
|
3258 |
|
3259 |
{ |
3260 |
BlockDriverAIOCBSync *acb; |
3261 |
|
3262 |
acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
3263 |
acb->is_write = is_write; |
3264 |
acb->qiov = qiov; |
3265 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
3266 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
3267 |
|
3268 |
if (is_write) {
|
3269 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
3270 |
acb->ret = bs->drv->bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
3271 |
} else {
|
3272 |
acb->ret = bs->drv->bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
3273 |
} |
3274 |
|
3275 |
qemu_bh_schedule(acb->bh); |
3276 |
|
3277 |
return &acb->common;
|
3278 |
} |
3279 |
|
3280 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
3281 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
3282 |
BlockDriverCompletionFunc *cb, void *opaque)
|
3283 |
{ |
3284 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
3285 |
} |
3286 |
|
3287 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
3288 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
3289 |
BlockDriverCompletionFunc *cb, void *opaque)
|
3290 |
{ |
3291 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
3292 |
} |
3293 |
|
3294 |
|
3295 |
typedef struct BlockDriverAIOCBCoroutine { |
3296 |
BlockDriverAIOCB common; |
3297 |
BlockRequest req; |
3298 |
bool is_write;
|
3299 |
QEMUBH* bh; |
3300 |
} BlockDriverAIOCBCoroutine; |
3301 |
|
3302 |
static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) |
3303 |
{ |
3304 |
qemu_aio_flush(); |
3305 |
} |
3306 |
|
3307 |
static AIOPool bdrv_em_co_aio_pool = {
|
3308 |
.aiocb_size = sizeof(BlockDriverAIOCBCoroutine),
|
3309 |
.cancel = bdrv_aio_co_cancel_em, |
3310 |
}; |
3311 |
|
3312 |
static void bdrv_co_em_bh(void *opaque) |
3313 |
{ |
3314 |
BlockDriverAIOCBCoroutine *acb = opaque; |
3315 |
|
3316 |
acb->common.cb(acb->common.opaque, acb->req.error); |
3317 |
qemu_bh_delete(acb->bh); |
3318 |
qemu_aio_release(acb); |
3319 |
} |
3320 |
|
3321 |
/* Invoke bdrv_co_do_readv/bdrv_co_do_writev */
|
3322 |
static void coroutine_fn bdrv_co_do_rw(void *opaque) |
3323 |
{ |
3324 |
BlockDriverAIOCBCoroutine *acb = opaque; |
3325 |
BlockDriverState *bs = acb->common.bs; |
3326 |
|
3327 |
if (!acb->is_write) {
|
3328 |
acb->req.error = bdrv_co_do_readv(bs, acb->req.sector, |
3329 |
acb->req.nb_sectors, acb->req.qiov, 0);
|
3330 |
} else {
|
3331 |
acb->req.error = bdrv_co_do_writev(bs, acb->req.sector, |
3332 |
acb->req.nb_sectors, acb->req.qiov, 0);
|
3333 |
} |
3334 |
|
3335 |
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
3336 |
qemu_bh_schedule(acb->bh); |
3337 |
} |
3338 |
|
3339 |
static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs,
|
3340 |
int64_t sector_num, |
3341 |
QEMUIOVector *qiov, |
3342 |
int nb_sectors,
|
3343 |
BlockDriverCompletionFunc *cb, |
3344 |
void *opaque,
|
3345 |
bool is_write)
|
3346 |
{ |
3347 |
Coroutine *co; |
3348 |
BlockDriverAIOCBCoroutine *acb; |
3349 |
|
3350 |
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
3351 |
acb->req.sector = sector_num; |
3352 |
acb->req.nb_sectors = nb_sectors; |
3353 |
acb->req.qiov = qiov; |
3354 |
acb->is_write = is_write; |
3355 |
|
3356 |
co = qemu_coroutine_create(bdrv_co_do_rw); |
3357 |
qemu_coroutine_enter(co, acb); |
3358 |
|
3359 |
return &acb->common;
|
3360 |
} |
3361 |
|
3362 |
static void coroutine_fn bdrv_aio_flush_co_entry(void *opaque) |
3363 |
{ |
3364 |
BlockDriverAIOCBCoroutine *acb = opaque; |
3365 |
BlockDriverState *bs = acb->common.bs; |
3366 |
|
3367 |
acb->req.error = bdrv_co_flush(bs); |
3368 |
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
3369 |
qemu_bh_schedule(acb->bh); |
3370 |
} |
3371 |
|
3372 |
BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
3373 |
BlockDriverCompletionFunc *cb, void *opaque)
|
3374 |
{ |
3375 |
trace_bdrv_aio_flush(bs, opaque); |
3376 |
|
3377 |
Coroutine *co; |
3378 |
BlockDriverAIOCBCoroutine *acb; |
3379 |
|
3380 |
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
3381 |
co = qemu_coroutine_create(bdrv_aio_flush_co_entry); |
3382 |
qemu_coroutine_enter(co, acb); |
3383 |
|
3384 |
return &acb->common;
|
3385 |
} |
3386 |
|
3387 |
static void coroutine_fn bdrv_aio_discard_co_entry(void *opaque) |
3388 |
{ |
3389 |
BlockDriverAIOCBCoroutine *acb = opaque; |
3390 |
BlockDriverState *bs = acb->common.bs; |
3391 |
|
3392 |
acb->req.error = bdrv_co_discard(bs, acb->req.sector, acb->req.nb_sectors); |
3393 |
acb->bh = qemu_bh_new(bdrv_co_em_bh, acb); |
3394 |
qemu_bh_schedule(acb->bh); |
3395 |
} |
3396 |
|
3397 |
BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs, |
3398 |
int64_t sector_num, int nb_sectors,
|
3399 |
BlockDriverCompletionFunc *cb, void *opaque)
|
3400 |
{ |
3401 |
Coroutine *co; |
3402 |
BlockDriverAIOCBCoroutine *acb; |
3403 |
|
3404 |
trace_bdrv_aio_discard(bs, sector_num, nb_sectors, opaque); |
3405 |
|
3406 |
acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); |
3407 |
acb->req.sector = sector_num; |
3408 |
acb->req.nb_sectors = nb_sectors; |
3409 |
co = qemu_coroutine_create(bdrv_aio_discard_co_entry); |
3410 |
qemu_coroutine_enter(co, acb); |
3411 |
|
3412 |
return &acb->common;
|
3413 |
} |
3414 |
|
3415 |
void bdrv_init(void) |
3416 |
{ |
3417 |
module_call_init(MODULE_INIT_BLOCK); |
3418 |
} |
3419 |
|
3420 |
void bdrv_init_with_whitelist(void) |
3421 |
{ |
3422 |
use_bdrv_whitelist = 1;
|
3423 |
bdrv_init(); |
3424 |
} |
3425 |
|
3426 |
void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
3427 |
BlockDriverCompletionFunc *cb, void *opaque)
|
3428 |
{ |
3429 |
BlockDriverAIOCB *acb; |
3430 |
|
3431 |
if (pool->free_aiocb) {
|
3432 |
acb = pool->free_aiocb; |
3433 |
pool->free_aiocb = acb->next; |
3434 |
} else {
|
3435 |
acb = g_malloc0(pool->aiocb_size); |
3436 |
acb->pool = pool; |
3437 |
} |
3438 |
acb->bs = bs; |
3439 |
acb->cb = cb; |
3440 |
acb->opaque = opaque; |
3441 |
return acb;
|
3442 |
} |
3443 |
|
3444 |
void qemu_aio_release(void *p) |
3445 |
{ |
3446 |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
3447 |
AIOPool *pool = acb->pool; |
3448 |
acb->next = pool->free_aiocb; |
3449 |
pool->free_aiocb = acb; |
3450 |
} |
3451 |
|
3452 |
/**************************************************************/
|
3453 |
/* Coroutine block device emulation */
|
3454 |
|
3455 |
typedef struct CoroutineIOCompletion { |
3456 |
Coroutine *coroutine; |
3457 |
int ret;
|
3458 |
} CoroutineIOCompletion; |
3459 |
|
3460 |
static void bdrv_co_io_em_complete(void *opaque, int ret) |
3461 |
{ |
3462 |
CoroutineIOCompletion *co = opaque; |
3463 |
|
3464 |
co->ret = ret; |
3465 |
qemu_coroutine_enter(co->coroutine, NULL);
|
3466 |
} |
3467 |
|
3468 |
static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, |
3469 |
int nb_sectors, QEMUIOVector *iov,
|
3470 |
bool is_write)
|
3471 |
{ |
3472 |
CoroutineIOCompletion co = { |
3473 |
.coroutine = qemu_coroutine_self(), |
3474 |
}; |
3475 |
BlockDriverAIOCB *acb; |
3476 |
|
3477 |
if (is_write) {
|
3478 |
acb = bs->drv->bdrv_aio_writev(bs, sector_num, iov, nb_sectors, |
3479 |
bdrv_co_io_em_complete, &co); |
3480 |
} else {
|
3481 |
acb = bs->drv->bdrv_aio_readv(bs, sector_num, iov, nb_sectors, |
3482 |
bdrv_co_io_em_complete, &co); |
3483 |
} |
3484 |
|
3485 |
trace_bdrv_co_io_em(bs, sector_num, nb_sectors, is_write, acb); |
3486 |
if (!acb) {
|
3487 |
return -EIO;
|
3488 |
} |
3489 |
qemu_coroutine_yield(); |
3490 |
|
3491 |
return co.ret;
|
3492 |
} |
3493 |
|
3494 |
static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, |
3495 |
int64_t sector_num, int nb_sectors,
|
3496 |
QEMUIOVector *iov) |
3497 |
{ |
3498 |
return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); |
3499 |
} |
3500 |
|
3501 |
static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, |
3502 |
int64_t sector_num, int nb_sectors,
|
3503 |
QEMUIOVector *iov) |
3504 |
{ |
3505 |
return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); |
3506 |
} |
3507 |
|
3508 |
static void coroutine_fn bdrv_flush_co_entry(void *opaque) |
3509 |
{ |
3510 |
RwCo *rwco = opaque; |
3511 |
|
3512 |
rwco->ret = bdrv_co_flush(rwco->bs); |
3513 |
} |
3514 |
|
3515 |
int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
|
3516 |
{ |
3517 |
int ret;
|
3518 |
|
3519 |
if (!bs->drv) {
|
3520 |
return 0; |
3521 |
} |
3522 |
|
3523 |
/* Write back cached data to the OS even with cache=unsafe */
|
3524 |
if (bs->drv->bdrv_co_flush_to_os) {
|
3525 |
ret = bs->drv->bdrv_co_flush_to_os(bs); |
3526 |
if (ret < 0) { |
3527 |
return ret;
|
3528 |
} |
3529 |
} |
3530 |
|
3531 |
/* But don't actually force it to the disk with cache=unsafe */
|
3532 |
if (bs->open_flags & BDRV_O_NO_FLUSH) {
|
3533 |
return 0; |
3534 |
} |
3535 |
|
3536 |
if (bs->drv->bdrv_co_flush_to_disk) {
|
3537 |
return bs->drv->bdrv_co_flush_to_disk(bs);
|
3538 |
} else if (bs->drv->bdrv_aio_flush) { |
3539 |
BlockDriverAIOCB *acb; |
3540 |
CoroutineIOCompletion co = { |
3541 |
.coroutine = qemu_coroutine_self(), |
3542 |
}; |
3543 |
|
3544 |
acb = bs->drv->bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); |
3545 |
if (acb == NULL) { |
3546 |
return -EIO;
|
3547 |
} else {
|
3548 |
qemu_coroutine_yield(); |
3549 |
return co.ret;
|
3550 |
} |
3551 |
} else {
|
3552 |
/*
|
3553 |
* Some block drivers always operate in either writethrough or unsafe
|
3554 |
* mode and don't support bdrv_flush therefore. Usually qemu doesn't
|
3555 |
* know how the server works (because the behaviour is hardcoded or
|
3556 |
* depends on server-side configuration), so we can't ensure that
|
3557 |
* everything is safe on disk. Returning an error doesn't work because
|
3558 |
* that would break guests even if the server operates in writethrough
|
3559 |
* mode.
|
3560 |
*
|
3561 |
* Let's hope the user knows what he's doing.
|
3562 |
*/
|
3563 |
return 0; |
3564 |
} |
3565 |
} |
3566 |
|
3567 |
void bdrv_invalidate_cache(BlockDriverState *bs)
|
3568 |
{ |
3569 |
if (bs->drv && bs->drv->bdrv_invalidate_cache) {
|
3570 |
bs->drv->bdrv_invalidate_cache(bs); |
3571 |
} |
3572 |
} |
3573 |
|
3574 |
void bdrv_invalidate_cache_all(void) |
3575 |
{ |
3576 |
BlockDriverState *bs; |
3577 |
|
3578 |
QTAILQ_FOREACH(bs, &bdrv_states, list) { |
3579 |
bdrv_invalidate_cache(bs); |
3580 |
} |
3581 |
} |
3582 |
|
3583 |
int bdrv_flush(BlockDriverState *bs)
|
3584 |
{ |
3585 |
Coroutine *co; |
3586 |
RwCo rwco = { |
3587 |
.bs = bs, |
3588 |
.ret = NOT_DONE, |
3589 |
}; |
3590 |
|
3591 |
if (qemu_in_coroutine()) {
|
3592 |
/* Fast-path if already in coroutine context */
|
3593 |
bdrv_flush_co_entry(&rwco); |
3594 |
} else {
|
3595 |
co = qemu_coroutine_create(bdrv_flush_co_entry); |
3596 |
qemu_coroutine_enter(co, &rwco); |
3597 |
while (rwco.ret == NOT_DONE) {
|
3598 |
qemu_aio_wait(); |
3599 |
} |
3600 |
} |
3601 |
|
3602 |
return rwco.ret;
|
3603 |
} |
3604 |
|
3605 |
static void coroutine_fn bdrv_discard_co_entry(void *opaque) |
3606 |
{ |
3607 |
RwCo *rwco = opaque; |
3608 |
|
3609 |
rwco->ret = bdrv_co_discard(rwco->bs, rwco->sector_num, rwco->nb_sectors); |
3610 |
} |
3611 |
|
3612 |
int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num,
|
3613 |
int nb_sectors)
|
3614 |
{ |
3615 |
if (!bs->drv) {
|
3616 |
return -ENOMEDIUM;
|
3617 |
} else if (bdrv_check_request(bs, sector_num, nb_sectors)) { |
3618 |
return -EIO;
|
3619 |
} else if (bs->read_only) { |
3620 |
return -EROFS;
|
3621 |
} else if (bs->drv->bdrv_co_discard) { |
3622 |
return bs->drv->bdrv_co_discard(bs, sector_num, nb_sectors);
|
3623 |
} else if (bs->drv->bdrv_aio_discard) { |
3624 |
BlockDriverAIOCB *acb; |
3625 |
CoroutineIOCompletion co = { |
3626 |
.coroutine = qemu_coroutine_self(), |
3627 |
}; |
3628 |
|
3629 |
acb = bs->drv->bdrv_aio_discard(bs, sector_num, nb_sectors, |
3630 |
bdrv_co_io_em_complete, &co); |
3631 |
if (acb == NULL) { |
3632 |
return -EIO;
|
3633 |
} else {
|
3634 |
qemu_coroutine_yield(); |
3635 |
return co.ret;
|
3636 |
} |
3637 |
} else {
|
3638 |
return 0; |
3639 |
} |
3640 |
} |
3641 |
|
3642 |
int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) |
3643 |
{ |
3644 |
Coroutine *co; |
3645 |
RwCo rwco = { |
3646 |
.bs = bs, |
3647 |
.sector_num = sector_num, |
3648 |
.nb_sectors = nb_sectors, |
3649 |
.ret = NOT_DONE, |
3650 |
}; |
3651 |
|
3652 |
if (qemu_in_coroutine()) {
|
3653 |
/* Fast-path if already in coroutine context */
|
3654 |
bdrv_discard_co_entry(&rwco); |
3655 |
} else {
|
3656 |
co = qemu_coroutine_create(bdrv_discard_co_entry); |
3657 |
qemu_coroutine_enter(co, &rwco); |
3658 |
while (rwco.ret == NOT_DONE) {
|
3659 |
qemu_aio_wait(); |
3660 |
} |
3661 |
} |
3662 |
|
3663 |
return rwco.ret;
|
3664 |
} |
3665 |
|
3666 |
/**************************************************************/
|
3667 |
/* removable device support */
|
3668 |
|
3669 |
/**
|
3670 |
* Return TRUE if the media is present
|
3671 |
*/
|
3672 |
int bdrv_is_inserted(BlockDriverState *bs)
|
3673 |
{ |
3674 |
BlockDriver *drv = bs->drv; |
3675 |
|
3676 |
if (!drv)
|
3677 |
return 0; |
3678 |
if (!drv->bdrv_is_inserted)
|
3679 |
return 1; |
3680 |
return drv->bdrv_is_inserted(bs);
|
3681 |
} |
3682 |
|
3683 |
/**
|
3684 |
* Return whether the media changed since the last call to this
|
3685 |
* function, or -ENOTSUP if we don't know. Most drivers don't know.
|
3686 |
*/
|
3687 |
int bdrv_media_changed(BlockDriverState *bs)
|
3688 |
{ |
3689 |
BlockDriver *drv = bs->drv; |
3690 |
|
3691 |
if (drv && drv->bdrv_media_changed) {
|
3692 |
return drv->bdrv_media_changed(bs);
|
3693 |
} |
3694 |
return -ENOTSUP;
|
3695 |
} |
3696 |
|
3697 |
/**
|
3698 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
3699 |
*/
|
3700 |
void bdrv_eject(BlockDriverState *bs, bool eject_flag) |
3701 |
{ |
3702 |
BlockDriver *drv = bs->drv; |
3703 |
|
3704 |
if (drv && drv->bdrv_eject) {
|
3705 |
drv->bdrv_eject(bs, eject_flag); |
3706 |
} |
3707 |
|
3708 |
if (bs->device_name[0] != '\0') { |
3709 |
bdrv_emit_qmp_eject_event(bs, eject_flag); |
3710 |
} |
3711 |
} |
3712 |
|
3713 |
/**
|
3714 |
* Lock or unlock the media (if it is locked, the user won't be able
|
3715 |
* to eject it manually).
|
3716 |
*/
|
3717 |
void bdrv_lock_medium(BlockDriverState *bs, bool locked) |
3718 |
{ |
3719 |
BlockDriver *drv = bs->drv; |
3720 |
|
3721 |
trace_bdrv_lock_medium(bs, locked); |
3722 |
|
3723 |
if (drv && drv->bdrv_lock_medium) {
|
3724 |
drv->bdrv_lock_medium(bs, locked); |
3725 |
} |
3726 |
} |
3727 |
|
3728 |
/* needed for generic scsi interface */
|
3729 |
|
3730 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
3731 |
{ |
3732 |
BlockDriver *drv = bs->drv; |
3733 |
|
3734 |
if (drv && drv->bdrv_ioctl)
|
3735 |
return drv->bdrv_ioctl(bs, req, buf);
|
3736 |
return -ENOTSUP;
|
3737 |
} |
3738 |
|
3739 |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
3740 |
unsigned long int req, void *buf, |
3741 |
BlockDriverCompletionFunc *cb, void *opaque)
|
3742 |
{ |
3743 |
BlockDriver *drv = bs->drv; |
3744 |
|
3745 |
if (drv && drv->bdrv_aio_ioctl)
|
3746 |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
3747 |
return NULL; |
3748 |
} |
3749 |
|
3750 |
void bdrv_set_buffer_alignment(BlockDriverState *bs, int align) |
3751 |
{ |
3752 |
bs->buffer_alignment = align; |
3753 |
} |
3754 |
|
3755 |
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
3756 |
{ |
3757 |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
3758 |
} |
3759 |
|
3760 |
void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
3761 |
{ |
3762 |
int64_t bitmap_size; |
3763 |
|
3764 |
bs->dirty_count = 0;
|
3765 |
if (enable) {
|
3766 |
if (!bs->dirty_bitmap) {
|
3767 |
bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
3768 |
BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
3769 |
bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
|
3770 |
|
3771 |
bs->dirty_bitmap = g_malloc0(bitmap_size); |
3772 |
} |
3773 |
} else {
|
3774 |
if (bs->dirty_bitmap) {
|
3775 |
g_free(bs->dirty_bitmap); |
3776 |
bs->dirty_bitmap = NULL;
|
3777 |
} |
3778 |
} |
3779 |
} |
3780 |
|
3781 |
int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
|
3782 |
{ |
3783 |
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
3784 |
|
3785 |
if (bs->dirty_bitmap &&
|
3786 |
(sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { |
3787 |
return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
3788 |
(1UL << (chunk % (sizeof(unsigned long) * 8)))); |
3789 |
} else {
|
3790 |
return 0; |
3791 |
} |
3792 |
} |
3793 |
|
3794 |
void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
|
3795 |
int nr_sectors)
|
3796 |
{ |
3797 |
set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
|
3798 |
} |
3799 |
|
3800 |
int64_t bdrv_get_dirty_count(BlockDriverState *bs) |
3801 |
{ |
3802 |
return bs->dirty_count;
|
3803 |
} |
3804 |
|
3805 |
void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
3806 |
{ |
3807 |
assert(bs->in_use != in_use); |
3808 |
bs->in_use = in_use; |
3809 |
} |
3810 |
|
3811 |
int bdrv_in_use(BlockDriverState *bs)
|
3812 |
{ |
3813 |
return bs->in_use;
|
3814 |
} |
3815 |
|
3816 |
void bdrv_iostatus_enable(BlockDriverState *bs)
|
3817 |
{ |
3818 |
bs->iostatus_enabled = true;
|
3819 |
bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3820 |
} |
3821 |
|
3822 |
/* The I/O status is only enabled if the drive explicitly
|
3823 |
* enables it _and_ the VM is configured to stop on errors */
|
3824 |
bool bdrv_iostatus_is_enabled(const BlockDriverState *bs) |
3825 |
{ |
3826 |
return (bs->iostatus_enabled &&
|
3827 |
(bs->on_write_error == BLOCK_ERR_STOP_ENOSPC || |
3828 |
bs->on_write_error == BLOCK_ERR_STOP_ANY || |
3829 |
bs->on_read_error == BLOCK_ERR_STOP_ANY)); |
3830 |
} |
3831 |
|
3832 |
void bdrv_iostatus_disable(BlockDriverState *bs)
|
3833 |
{ |
3834 |
bs->iostatus_enabled = false;
|
3835 |
} |
3836 |
|
3837 |
void bdrv_iostatus_reset(BlockDriverState *bs)
|
3838 |
{ |
3839 |
if (bdrv_iostatus_is_enabled(bs)) {
|
3840 |
bs->iostatus = BLOCK_DEVICE_IO_STATUS_OK; |
3841 |
} |
3842 |
} |
3843 |
|
3844 |
/* XXX: Today this is set by device models because it makes the implementation
|
3845 |
quite simple. However, the block layer knows about the error, so it's
|
3846 |
possible to implement this without device models being involved */
|
3847 |
void bdrv_iostatus_set_err(BlockDriverState *bs, int error) |
3848 |
{ |
3849 |
if (bdrv_iostatus_is_enabled(bs) &&
|
3850 |
bs->iostatus == BLOCK_DEVICE_IO_STATUS_OK) { |
3851 |
assert(error >= 0);
|
3852 |
bs->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE : |
3853 |
BLOCK_DEVICE_IO_STATUS_FAILED; |
3854 |
} |
3855 |
} |
3856 |
|
3857 |
void
|
3858 |
bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, |
3859 |
enum BlockAcctType type)
|
3860 |
{ |
3861 |
assert(type < BDRV_MAX_IOTYPE); |
3862 |
|
3863 |
cookie->bytes = bytes; |
3864 |
cookie->start_time_ns = get_clock(); |
3865 |
cookie->type = type; |
3866 |
} |
3867 |
|
3868 |
void
|
3869 |
bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) |
3870 |
{ |
3871 |
assert(cookie->type < BDRV_MAX_IOTYPE); |
3872 |
|
3873 |
bs->nr_bytes[cookie->type] += cookie->bytes; |
3874 |
bs->nr_ops[cookie->type]++; |
3875 |
bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; |
3876 |
} |
3877 |
|
3878 |
int bdrv_img_create(const char *filename, const char *fmt, |
3879 |
const char *base_filename, const char *base_fmt, |
3880 |
char *options, uint64_t img_size, int flags) |
3881 |
{ |
3882 |
QEMUOptionParameter *param = NULL, *create_options = NULL; |
3883 |
QEMUOptionParameter *backing_fmt, *backing_file, *size; |
3884 |
BlockDriverState *bs = NULL;
|
3885 |
BlockDriver *drv, *proto_drv; |
3886 |
BlockDriver *backing_drv = NULL;
|
3887 |
int ret = 0; |
3888 |
|
3889 |
/* Find driver and parse its options */
|
3890 |
drv = bdrv_find_format(fmt); |
3891 |
if (!drv) {
|
3892 |
error_report("Unknown file format '%s'", fmt);
|
3893 |
ret = -EINVAL; |
3894 |
goto out;
|
3895 |
} |
3896 |
|
3897 |
proto_drv = bdrv_find_protocol(filename); |
3898 |
if (!proto_drv) {
|
3899 |
error_report("Unknown protocol '%s'", filename);
|
3900 |
ret = -EINVAL; |
3901 |
goto out;
|
3902 |
} |
3903 |
|
3904 |
create_options = append_option_parameters(create_options, |
3905 |
drv->create_options); |
3906 |
create_options = append_option_parameters(create_options, |
3907 |
proto_drv->create_options); |
3908 |
|
3909 |
/* Create parameter list with default values */
|
3910 |
param = parse_option_parameters("", create_options, param);
|
3911 |
|
3912 |
set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); |
3913 |
|
3914 |
/* Parse -o options */
|
3915 |
if (options) {
|
3916 |
param = parse_option_parameters(options, create_options, param); |
3917 |
if (param == NULL) { |
3918 |
error_report("Invalid options for file format '%s'.", fmt);
|
3919 |
ret = -EINVAL; |
3920 |
goto out;
|
3921 |
} |
3922 |
} |
3923 |
|
3924 |
if (base_filename) {
|
3925 |
if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE,
|
3926 |
base_filename)) { |
3927 |
error_report("Backing file not supported for file format '%s'",
|
3928 |
fmt); |
3929 |
ret = -EINVAL; |
3930 |
goto out;
|
3931 |
} |
3932 |
} |
3933 |
|
3934 |
if (base_fmt) {
|
3935 |
if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) {
|
3936 |
error_report("Backing file format not supported for file "
|
3937 |
"format '%s'", fmt);
|
3938 |
ret = -EINVAL; |
3939 |
goto out;
|
3940 |
} |
3941 |
} |
3942 |
|
3943 |
backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
3944 |
if (backing_file && backing_file->value.s) {
|
3945 |
if (!strcmp(filename, backing_file->value.s)) {
|
3946 |
error_report("Error: Trying to create an image with the "
|
3947 |
"same filename as the backing file");
|
3948 |
ret = -EINVAL; |
3949 |
goto out;
|
3950 |
} |
3951 |
} |
3952 |
|
3953 |
backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
3954 |
if (backing_fmt && backing_fmt->value.s) {
|
3955 |
backing_drv = bdrv_find_format(backing_fmt->value.s); |
3956 |
if (!backing_drv) {
|
3957 |
error_report("Unknown backing file format '%s'",
|
3958 |
backing_fmt->value.s); |
3959 |
ret = -EINVAL; |
3960 |
goto out;
|
3961 |
} |
3962 |
} |
3963 |
|
3964 |
// The size for the image must always be specified, with one exception:
|
3965 |
// If we are using a backing file, we can obtain the size from there
|
3966 |
size = get_option_parameter(param, BLOCK_OPT_SIZE); |
3967 |
if (size && size->value.n == -1) { |
3968 |
if (backing_file && backing_file->value.s) {
|
3969 |
uint64_t size; |
3970 |
char buf[32]; |
3971 |
|
3972 |
bs = bdrv_new("");
|
3973 |
|
3974 |
ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv); |
3975 |
if (ret < 0) { |
3976 |
error_report("Could not open '%s'", backing_file->value.s);
|
3977 |
goto out;
|
3978 |
} |
3979 |
bdrv_get_geometry(bs, &size); |
3980 |
size *= 512;
|
3981 |
|
3982 |
snprintf(buf, sizeof(buf), "%" PRId64, size); |
3983 |
set_option_parameter(param, BLOCK_OPT_SIZE, buf); |
3984 |
} else {
|
3985 |
error_report("Image creation needs a size parameter");
|
3986 |
ret = -EINVAL; |
3987 |
goto out;
|
3988 |
} |
3989 |
} |
3990 |
|
3991 |
printf("Formatting '%s', fmt=%s ", filename, fmt);
|
3992 |
print_option_parameters(param); |
3993 |
puts("");
|
3994 |
|
3995 |
ret = bdrv_create(drv, filename, param); |
3996 |
|
3997 |
if (ret < 0) { |
3998 |
if (ret == -ENOTSUP) {
|
3999 |
error_report("Formatting or formatting option not supported for "
|
4000 |
"file format '%s'", fmt);
|
4001 |
} else if (ret == -EFBIG) { |
4002 |
error_report("The image size is too large for file format '%s'",
|
4003 |
fmt); |
4004 |
} else {
|
4005 |
error_report("%s: error while creating %s: %s", filename, fmt,
|
4006 |
strerror(-ret)); |
4007 |
} |
4008 |
} |
4009 |
|
4010 |
out:
|
4011 |
free_option_parameters(create_options); |
4012 |
free_option_parameters(param); |
4013 |
|
4014 |
if (bs) {
|
4015 |
bdrv_delete(bs); |
4016 |
} |
4017 |
|
4018 |
return ret;
|
4019 |
} |
4020 |
|
4021 |
void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs, |
4022 |
BlockDriverCompletionFunc *cb, void *opaque)
|
4023 |
{ |
4024 |
BlockJob *job; |
4025 |
|
4026 |
if (bs->job || bdrv_in_use(bs)) {
|
4027 |
return NULL; |
4028 |
} |
4029 |
bdrv_set_in_use(bs, 1);
|
4030 |
|
4031 |
job = g_malloc0(job_type->instance_size); |
4032 |
job->job_type = job_type; |
4033 |
job->bs = bs; |
4034 |
job->cb = cb; |
4035 |
job->opaque = opaque; |
4036 |
bs->job = job; |
4037 |
return job;
|
4038 |
} |
4039 |
|
4040 |
void block_job_complete(BlockJob *job, int ret) |
4041 |
{ |
4042 |
BlockDriverState *bs = job->bs; |
4043 |
|
4044 |
assert(bs->job == job); |
4045 |
job->cb(job->opaque, ret); |
4046 |
bs->job = NULL;
|
4047 |
g_free(job); |
4048 |
bdrv_set_in_use(bs, 0);
|
4049 |
} |
4050 |
|
4051 |
int block_job_set_speed(BlockJob *job, int64_t value)
|
4052 |
{ |
4053 |
if (!job->job_type->set_speed) {
|
4054 |
return -ENOTSUP;
|
4055 |
} |
4056 |
return job->job_type->set_speed(job, value);
|
4057 |
} |
4058 |
|
4059 |
void block_job_cancel(BlockJob *job)
|
4060 |
{ |
4061 |
job->cancelled = true;
|
4062 |
} |
4063 |
|
4064 |
bool block_job_is_cancelled(BlockJob *job)
|
4065 |
{ |
4066 |
return job->cancelled;
|
4067 |
} |