10817bf09d
The coroutine files are currently referenced by the block-obj-y variable. The coroutine functionality though is already used by more than just the block code. eg migration code uses coroutine yield. In the future the I/O channel code will also use the coroutine yield functionality. Since the coroutine code is nicely self-contained it can be easily built as part of the libqemuutil.a library, making it widely available. The headers are also moved into include/qemu, instead of the include/block directory, since they are now part of the util codebase, and the impl was never in the block/ directory either. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
676 lines
26 KiB
C
676 lines
26 KiB
C
/*
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef BLOCK_INT_H
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#define BLOCK_INT_H
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#include "block/accounting.h"
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#include "block/block.h"
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#include "qemu/option.h"
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#include "qemu/queue.h"
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#include "qemu/coroutine.h"
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#include "qemu/timer.h"
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#include "qapi-types.h"
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#include "qemu/hbitmap.h"
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#include "block/snapshot.h"
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#include "qemu/main-loop.h"
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#include "qemu/throttle.h"
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#define BLOCK_FLAG_ENCRYPT 1
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#define BLOCK_FLAG_COMPAT6 4
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#define BLOCK_FLAG_LAZY_REFCOUNTS 8
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#define BLOCK_OPT_SIZE "size"
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#define BLOCK_OPT_ENCRYPT "encryption"
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#define BLOCK_OPT_COMPAT6 "compat6"
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#define BLOCK_OPT_BACKING_FILE "backing_file"
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#define BLOCK_OPT_BACKING_FMT "backing_fmt"
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#define BLOCK_OPT_CLUSTER_SIZE "cluster_size"
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#define BLOCK_OPT_TABLE_SIZE "table_size"
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#define BLOCK_OPT_PREALLOC "preallocation"
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#define BLOCK_OPT_SUBFMT "subformat"
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#define BLOCK_OPT_COMPAT_LEVEL "compat"
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#define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts"
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#define BLOCK_OPT_ADAPTER_TYPE "adapter_type"
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#define BLOCK_OPT_REDUNDANCY "redundancy"
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#define BLOCK_OPT_NOCOW "nocow"
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#define BLOCK_OPT_OBJECT_SIZE "object_size"
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#define BLOCK_OPT_REFCOUNT_BITS "refcount_bits"
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#define BLOCK_PROBE_BUF_SIZE 512
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typedef struct BdrvTrackedRequest {
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BlockDriverState *bs;
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int64_t offset;
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unsigned int bytes;
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bool is_write;
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bool serialising;
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int64_t overlap_offset;
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unsigned int overlap_bytes;
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QLIST_ENTRY(BdrvTrackedRequest) list;
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Coroutine *co; /* owner, used for deadlock detection */
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CoQueue wait_queue; /* coroutines blocked on this request */
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struct BdrvTrackedRequest *waiting_for;
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} BdrvTrackedRequest;
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struct BlockDriver {
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const char *format_name;
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int instance_size;
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/* set to true if the BlockDriver is a block filter */
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bool is_filter;
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/* for snapshots block filter like Quorum can implement the
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* following recursive callback.
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* It's purpose is to recurse on the filter children while calling
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* bdrv_recurse_is_first_non_filter on them.
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* For a sample implementation look in the future Quorum block filter.
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*/
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bool (*bdrv_recurse_is_first_non_filter)(BlockDriverState *bs,
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BlockDriverState *candidate);
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int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
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int (*bdrv_probe_device)(const char *filename);
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/* Any driver implementing this callback is expected to be able to handle
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* NULL file names in its .bdrv_open() implementation */
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void (*bdrv_parse_filename)(const char *filename, QDict *options, Error **errp);
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/* Drivers not implementing bdrv_parse_filename nor bdrv_open should have
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* this field set to true, except ones that are defined only by their
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* child's bs.
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* An example of the last type will be the quorum block driver.
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*/
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bool bdrv_needs_filename;
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/* Set if a driver can support backing files */
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bool supports_backing;
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/* For handling image reopen for split or non-split files */
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int (*bdrv_reopen_prepare)(BDRVReopenState *reopen_state,
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BlockReopenQueue *queue, Error **errp);
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void (*bdrv_reopen_commit)(BDRVReopenState *reopen_state);
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void (*bdrv_reopen_abort)(BDRVReopenState *reopen_state);
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int (*bdrv_open)(BlockDriverState *bs, QDict *options, int flags,
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Error **errp);
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int (*bdrv_file_open)(BlockDriverState *bs, QDict *options, int flags,
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Error **errp);
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int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors);
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int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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void (*bdrv_close)(BlockDriverState *bs);
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int (*bdrv_create)(const char *filename, QemuOpts *opts, Error **errp);
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int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
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int (*bdrv_make_empty)(BlockDriverState *bs);
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void (*bdrv_refresh_filename)(BlockDriverState *bs);
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/* aio */
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BlockAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque);
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BlockAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque);
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BlockAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs,
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BlockCompletionFunc *cb, void *opaque);
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BlockAIOCB *(*bdrv_aio_discard)(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque);
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int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
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int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
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/*
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* Efficiently zero a region of the disk image. Typically an image format
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* would use a compact metadata representation to implement this. This
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* function pointer may be NULL and .bdrv_co_writev() will be called
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* instead.
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*/
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int coroutine_fn (*bdrv_co_write_zeroes)(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, BdrvRequestFlags flags);
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int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors);
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int64_t coroutine_fn (*bdrv_co_get_block_status)(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, int *pnum);
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/*
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* Invalidate any cached meta-data.
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*/
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void (*bdrv_invalidate_cache)(BlockDriverState *bs, Error **errp);
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/*
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* Flushes all data that was already written to the OS all the way down to
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* the disk (for example raw-posix calls fsync()).
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*/
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int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs);
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/*
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* Flushes all internal caches to the OS. The data may still sit in a
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* writeback cache of the host OS, but it will survive a crash of the qemu
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* process.
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*/
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int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs);
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const char *protocol_name;
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int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
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int64_t (*bdrv_getlength)(BlockDriverState *bs);
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bool has_variable_length;
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int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs);
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int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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int (*bdrv_snapshot_create)(BlockDriverState *bs,
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QEMUSnapshotInfo *sn_info);
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int (*bdrv_snapshot_goto)(BlockDriverState *bs,
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const char *snapshot_id);
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int (*bdrv_snapshot_delete)(BlockDriverState *bs,
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const char *snapshot_id,
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const char *name,
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Error **errp);
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int (*bdrv_snapshot_list)(BlockDriverState *bs,
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QEMUSnapshotInfo **psn_info);
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int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs,
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const char *snapshot_id,
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const char *name,
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Error **errp);
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int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
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ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs);
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int (*bdrv_save_vmstate)(BlockDriverState *bs, QEMUIOVector *qiov,
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int64_t pos);
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int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
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int64_t pos, int size);
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int (*bdrv_change_backing_file)(BlockDriverState *bs,
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const char *backing_file, const char *backing_fmt);
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/* removable device specific */
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int (*bdrv_is_inserted)(BlockDriverState *bs);
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int (*bdrv_media_changed)(BlockDriverState *bs);
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void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag);
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void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked);
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/* to control generic scsi devices */
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int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
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BlockAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
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unsigned long int req, void *buf,
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BlockCompletionFunc *cb, void *opaque);
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/* List of options for creating images, terminated by name == NULL */
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QemuOptsList *create_opts;
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/*
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* Returns 0 for completed check, -errno for internal errors.
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* The check results are stored in result.
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*/
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int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result,
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BdrvCheckMode fix);
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int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts,
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BlockDriverAmendStatusCB *status_cb);
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void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
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/* TODO Better pass a option string/QDict/QemuOpts to add any rule? */
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int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event,
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const char *tag);
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int (*bdrv_debug_remove_breakpoint)(BlockDriverState *bs,
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const char *tag);
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int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag);
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bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag);
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void (*bdrv_refresh_limits)(BlockDriverState *bs, Error **errp);
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/*
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* Returns 1 if newly created images are guaranteed to contain only
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* zeros, 0 otherwise.
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*/
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int (*bdrv_has_zero_init)(BlockDriverState *bs);
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/* Remove fd handlers, timers, and other event loop callbacks so the event
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* loop is no longer in use. Called with no in-flight requests and in
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* depth-first traversal order with parents before child nodes.
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*/
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void (*bdrv_detach_aio_context)(BlockDriverState *bs);
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/* Add fd handlers, timers, and other event loop callbacks so I/O requests
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* can be processed again. Called with no in-flight requests and in
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* depth-first traversal order with child nodes before parent nodes.
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*/
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void (*bdrv_attach_aio_context)(BlockDriverState *bs,
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AioContext *new_context);
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/* io queue for linux-aio */
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void (*bdrv_io_plug)(BlockDriverState *bs);
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void (*bdrv_io_unplug)(BlockDriverState *bs);
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void (*bdrv_flush_io_queue)(BlockDriverState *bs);
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/**
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* Try to get @bs's logical and physical block size.
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* On success, store them in @bsz and return zero.
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* On failure, return negative errno.
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*/
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int (*bdrv_probe_blocksizes)(BlockDriverState *bs, BlockSizes *bsz);
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/**
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* Try to get @bs's geometry (cyls, heads, sectors)
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* On success, store them in @geo and return 0.
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* On failure return -errno.
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* Only drivers that want to override guest geometry implement this
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* callback; see hd_geometry_guess().
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*/
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int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo);
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QLIST_ENTRY(BlockDriver) list;
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};
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typedef struct BlockLimits {
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/* maximum number of sectors that can be discarded at once */
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int max_discard;
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/* optimal alignment for discard requests in sectors */
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int64_t discard_alignment;
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/* maximum number of sectors that can zeroized at once */
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int max_write_zeroes;
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/* optimal alignment for write zeroes requests in sectors */
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int64_t write_zeroes_alignment;
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/* optimal transfer length in sectors */
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int opt_transfer_length;
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/* maximal transfer length in sectors */
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int max_transfer_length;
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/* memory alignment so that no bounce buffer is needed */
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size_t min_mem_alignment;
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/* memory alignment for bounce buffer */
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size_t opt_mem_alignment;
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} BlockLimits;
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typedef struct BdrvOpBlocker BdrvOpBlocker;
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typedef struct BdrvAioNotifier {
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void (*attached_aio_context)(AioContext *new_context, void *opaque);
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void (*detach_aio_context)(void *opaque);
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void *opaque;
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QLIST_ENTRY(BdrvAioNotifier) list;
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} BdrvAioNotifier;
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struct BdrvChildRole {
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int (*inherit_flags)(int parent_flags);
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};
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extern const BdrvChildRole child_file;
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extern const BdrvChildRole child_format;
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struct BdrvChild {
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BlockDriverState *bs;
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const BdrvChildRole *role;
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QLIST_ENTRY(BdrvChild) next;
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QLIST_ENTRY(BdrvChild) next_parent;
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};
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/*
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* Note: the function bdrv_append() copies and swaps contents of
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* BlockDriverStates, so if you add new fields to this struct, please
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* inspect bdrv_append() to determine if the new fields need to be
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* copied as well.
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*/
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struct BlockDriverState {
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int64_t total_sectors; /* if we are reading a disk image, give its
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size in sectors */
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int read_only; /* if true, the media is read only */
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int open_flags; /* flags used to open the file, re-used for re-open */
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int encrypted; /* if true, the media is encrypted */
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int valid_key; /* if true, a valid encryption key has been set */
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int sg; /* if true, the device is a /dev/sg* */
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int copy_on_read; /* if true, copy read backing sectors into image
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note this is a reference count */
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bool probed;
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BlockDriver *drv; /* NULL means no media */
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void *opaque;
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BlockBackend *blk; /* owning backend, if any */
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AioContext *aio_context; /* event loop used for fd handlers, timers, etc */
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/* long-running tasks intended to always use the same AioContext as this
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* BDS may register themselves in this list to be notified of changes
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* regarding this BDS's context */
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QLIST_HEAD(, BdrvAioNotifier) aio_notifiers;
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char filename[PATH_MAX];
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char backing_file[PATH_MAX]; /* if non zero, the image is a diff of
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this file image */
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char backing_format[16]; /* if non-zero and backing_file exists */
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QDict *full_open_options;
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char exact_filename[PATH_MAX];
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BdrvChild *backing;
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BdrvChild *file;
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NotifierList close_notifiers;
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/* Callback before write request is processed */
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NotifierWithReturnList before_write_notifiers;
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/* number of in-flight serialising requests */
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unsigned int serialising_in_flight;
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/* I/O throttling */
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CoQueue throttled_reqs[2];
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bool io_limits_enabled;
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/* The following fields are protected by the ThrottleGroup lock.
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* See the ThrottleGroup documentation for details. */
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ThrottleState *throttle_state;
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ThrottleTimers throttle_timers;
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unsigned pending_reqs[2];
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QLIST_ENTRY(BlockDriverState) round_robin;
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/* I/O stats (display with "info blockstats"). */
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BlockAcctStats stats;
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/* I/O Limits */
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BlockLimits bl;
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/* Whether produces zeros when read beyond eof */
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bool zero_beyond_eof;
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/* Alignment requirement for offset/length of I/O requests */
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unsigned int request_alignment;
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/* the block size for which the guest device expects atomicity */
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int guest_block_size;
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/* do we need to tell the quest if we have a volatile write cache? */
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int enable_write_cache;
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/* NOTE: the following infos are only hints for real hardware
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drivers. They are not used by the block driver */
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BlockdevOnError on_read_error, on_write_error;
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bool iostatus_enabled;
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BlockDeviceIoStatus iostatus;
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/* the following member gives a name to every node on the bs graph. */
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char node_name[32];
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/* element of the list of named nodes building the graph */
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QTAILQ_ENTRY(BlockDriverState) node_list;
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/* element of the list of "drives" the guest sees */
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QTAILQ_ENTRY(BlockDriverState) device_list;
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QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
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int refcnt;
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QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;
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/* operation blockers */
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QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX];
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/* long-running background operation */
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BlockJob *job;
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/* The node that this node inherited default options from (and a reopen on
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* which can affect this node by changing these defaults). This is always a
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* parent node of this node. */
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BlockDriverState *inherits_from;
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QLIST_HEAD(, BdrvChild) children;
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QLIST_HEAD(, BdrvChild) parents;
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QDict *options;
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BlockdevDetectZeroesOptions detect_zeroes;
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/* The error object in use for blocking operations on backing_hd */
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Error *backing_blocker;
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/* threshold limit for writes, in bytes. "High water mark". */
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uint64_t write_threshold_offset;
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NotifierWithReturn write_threshold_notifier;
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};
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|
|
|
static inline BlockDriverState *backing_bs(BlockDriverState *bs)
|
|
{
|
|
return bs->backing ? bs->backing->bs : NULL;
|
|
}
|
|
|
|
|
|
/* Essential block drivers which must always be statically linked into qemu, and
|
|
* which therefore can be accessed without using bdrv_find_format() */
|
|
extern BlockDriver bdrv_file;
|
|
extern BlockDriver bdrv_raw;
|
|
extern BlockDriver bdrv_qcow2;
|
|
|
|
/**
|
|
* bdrv_setup_io_funcs:
|
|
*
|
|
* Prepare a #BlockDriver for I/O request processing by populating
|
|
* unimplemented coroutine and AIO interfaces with generic wrapper functions
|
|
* that fall back to implemented interfaces.
|
|
*/
|
|
void bdrv_setup_io_funcs(BlockDriver *bdrv);
|
|
|
|
int get_tmp_filename(char *filename, int size);
|
|
BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size,
|
|
const char *filename);
|
|
|
|
void bdrv_set_io_limits(BlockDriverState *bs,
|
|
ThrottleConfig *cfg);
|
|
|
|
|
|
/**
|
|
* bdrv_add_before_write_notifier:
|
|
*
|
|
* Register a callback that is invoked before write requests are processed but
|
|
* after any throttling or waiting for overlapping requests.
|
|
*/
|
|
void bdrv_add_before_write_notifier(BlockDriverState *bs,
|
|
NotifierWithReturn *notifier);
|
|
|
|
/**
|
|
* bdrv_detach_aio_context:
|
|
*
|
|
* May be called from .bdrv_detach_aio_context() to detach children from the
|
|
* current #AioContext. This is only needed by block drivers that manage their
|
|
* own children. Both ->file and ->backing are automatically handled and
|
|
* block drivers should not call this function on them explicitly.
|
|
*/
|
|
void bdrv_detach_aio_context(BlockDriverState *bs);
|
|
|
|
/**
|
|
* bdrv_attach_aio_context:
|
|
*
|
|
* May be called from .bdrv_attach_aio_context() to attach children to the new
|
|
* #AioContext. This is only needed by block drivers that manage their own
|
|
* children. Both ->file and ->backing are automatically handled and block
|
|
* drivers should not call this function on them explicitly.
|
|
*/
|
|
void bdrv_attach_aio_context(BlockDriverState *bs,
|
|
AioContext *new_context);
|
|
|
|
/**
|
|
* bdrv_add_aio_context_notifier:
|
|
*
|
|
* If a long-running job intends to be always run in the same AioContext as a
|
|
* certain BDS, it may use this function to be notified of changes regarding the
|
|
* association of the BDS to an AioContext.
|
|
*
|
|
* attached_aio_context() is called after the target BDS has been attached to a
|
|
* new AioContext; detach_aio_context() is called before the target BDS is being
|
|
* detached from its old AioContext.
|
|
*/
|
|
void bdrv_add_aio_context_notifier(BlockDriverState *bs,
|
|
void (*attached_aio_context)(AioContext *new_context, void *opaque),
|
|
void (*detach_aio_context)(void *opaque), void *opaque);
|
|
|
|
/**
|
|
* bdrv_remove_aio_context_notifier:
|
|
*
|
|
* Unsubscribe of change notifications regarding the BDS's AioContext. The
|
|
* parameters given here have to be the same as those given to
|
|
* bdrv_add_aio_context_notifier().
|
|
*/
|
|
void bdrv_remove_aio_context_notifier(BlockDriverState *bs,
|
|
void (*aio_context_attached)(AioContext *,
|
|
void *),
|
|
void (*aio_context_detached)(void *),
|
|
void *opaque);
|
|
|
|
#ifdef _WIN32
|
|
int is_windows_drive(const char *filename);
|
|
#endif
|
|
|
|
/**
|
|
* stream_start:
|
|
* @bs: Block device to operate on.
|
|
* @base: Block device that will become the new base, or %NULL to
|
|
* flatten the whole backing file chain onto @bs.
|
|
* @base_id: The file name that will be written to @bs as the new
|
|
* backing file if the job completes. Ignored if @base is %NULL.
|
|
* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
|
|
* @on_error: The action to take upon error.
|
|
* @cb: Completion function for the job.
|
|
* @opaque: Opaque pointer value passed to @cb.
|
|
* @errp: Error object.
|
|
*
|
|
* Start a streaming operation on @bs. Clusters that are unallocated
|
|
* in @bs, but allocated in any image between @base and @bs (both
|
|
* exclusive) will be written to @bs. At the end of a successful
|
|
* streaming job, the backing file of @bs will be changed to
|
|
* @base_id in the written image and to @base in the live BlockDriverState.
|
|
*/
|
|
void stream_start(BlockDriverState *bs, BlockDriverState *base,
|
|
const char *base_id, int64_t speed, BlockdevOnError on_error,
|
|
BlockCompletionFunc *cb,
|
|
void *opaque, Error **errp);
|
|
|
|
/**
|
|
* commit_start:
|
|
* @bs: Active block device.
|
|
* @top: Top block device to be committed.
|
|
* @base: Block device that will be written into, and become the new top.
|
|
* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
|
|
* @on_error: The action to take upon error.
|
|
* @cb: Completion function for the job.
|
|
* @opaque: Opaque pointer value passed to @cb.
|
|
* @backing_file_str: String to use as the backing file in @top's overlay
|
|
* @errp: Error object.
|
|
*
|
|
*/
|
|
void commit_start(BlockDriverState *bs, BlockDriverState *base,
|
|
BlockDriverState *top, int64_t speed,
|
|
BlockdevOnError on_error, BlockCompletionFunc *cb,
|
|
void *opaque, const char *backing_file_str, Error **errp);
|
|
/**
|
|
* commit_active_start:
|
|
* @bs: Active block device to be committed.
|
|
* @base: Block device that will be written into, and become the new top.
|
|
* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
|
|
* @on_error: The action to take upon error.
|
|
* @cb: Completion function for the job.
|
|
* @opaque: Opaque pointer value passed to @cb.
|
|
* @errp: Error object.
|
|
*
|
|
*/
|
|
void commit_active_start(BlockDriverState *bs, BlockDriverState *base,
|
|
int64_t speed,
|
|
BlockdevOnError on_error,
|
|
BlockCompletionFunc *cb,
|
|
void *opaque, Error **errp);
|
|
/*
|
|
* mirror_start:
|
|
* @bs: Block device to operate on.
|
|
* @target: Block device to write to.
|
|
* @replaces: Block graph node name to replace once the mirror is done. Can
|
|
* only be used when full mirroring is selected.
|
|
* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
|
|
* @granularity: The chosen granularity for the dirty bitmap.
|
|
* @buf_size: The amount of data that can be in flight at one time.
|
|
* @mode: Whether to collapse all images in the chain to the target.
|
|
* @on_source_error: The action to take upon error reading from the source.
|
|
* @on_target_error: The action to take upon error writing to the target.
|
|
* @unmap: Whether to unmap target where source sectors only contain zeroes.
|
|
* @cb: Completion function for the job.
|
|
* @opaque: Opaque pointer value passed to @cb.
|
|
* @errp: Error object.
|
|
*
|
|
* Start a mirroring operation on @bs. Clusters that are allocated
|
|
* in @bs will be written to @bs until the job is cancelled or
|
|
* manually completed. At the end of a successful mirroring job,
|
|
* @bs will be switched to read from @target.
|
|
*/
|
|
void mirror_start(BlockDriverState *bs, BlockDriverState *target,
|
|
const char *replaces,
|
|
int64_t speed, uint32_t granularity, int64_t buf_size,
|
|
MirrorSyncMode mode, BlockdevOnError on_source_error,
|
|
BlockdevOnError on_target_error,
|
|
bool unmap,
|
|
BlockCompletionFunc *cb,
|
|
void *opaque, Error **errp);
|
|
|
|
/*
|
|
* backup_start:
|
|
* @bs: Block device to operate on.
|
|
* @target: Block device to write to.
|
|
* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
|
|
* @sync_mode: What parts of the disk image should be copied to the destination.
|
|
* @sync_bitmap: The dirty bitmap if sync_mode is MIRROR_SYNC_MODE_INCREMENTAL.
|
|
* @on_source_error: The action to take upon error reading from the source.
|
|
* @on_target_error: The action to take upon error writing to the target.
|
|
* @cb: Completion function for the job.
|
|
* @opaque: Opaque pointer value passed to @cb.
|
|
*
|
|
* Start a backup operation on @bs. Clusters in @bs are written to @target
|
|
* until the job is cancelled or manually completed.
|
|
*/
|
|
void backup_start(BlockDriverState *bs, BlockDriverState *target,
|
|
int64_t speed, MirrorSyncMode sync_mode,
|
|
BdrvDirtyBitmap *sync_bitmap,
|
|
BlockdevOnError on_source_error,
|
|
BlockdevOnError on_target_error,
|
|
BlockCompletionFunc *cb, void *opaque,
|
|
Error **errp);
|
|
|
|
void blk_set_bs(BlockBackend *blk, BlockDriverState *bs);
|
|
|
|
void blk_dev_change_media_cb(BlockBackend *blk, bool load);
|
|
bool blk_dev_has_removable_media(BlockBackend *blk);
|
|
void blk_dev_eject_request(BlockBackend *blk, bool force);
|
|
bool blk_dev_is_tray_open(BlockBackend *blk);
|
|
bool blk_dev_is_medium_locked(BlockBackend *blk);
|
|
void blk_dev_resize_cb(BlockBackend *blk);
|
|
|
|
void bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int nr_sectors);
|
|
bool bdrv_requests_pending(BlockDriverState *bs);
|
|
|
|
#endif /* BLOCK_INT_H */
|