808 lines
32 KiB
C
808 lines
32 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_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_HWVERSION "hwversion"
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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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enum BdrvTrackedRequestType {
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BDRV_TRACKED_READ,
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BDRV_TRACKED_WRITE,
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BDRV_TRACKED_DISCARD,
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};
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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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enum BdrvTrackedRequestType type;
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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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void (*bdrv_join_options)(QDict *options, QDict *old_options);
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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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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, QDict *options);
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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_pdiscard)(BlockDriverState *bs,
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int64_t offset, int count,
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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_preadv)(BlockDriverState *bs,
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uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags);
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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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int coroutine_fn (*bdrv_co_writev_flags)(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov, int flags);
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int coroutine_fn (*bdrv_co_pwritev)(BlockDriverState *bs,
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uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags);
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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 or return -ENOSUP and .bdrv_co_writev()
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* will be called instead.
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*/
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int coroutine_fn (*bdrv_co_pwrite_zeroes)(BlockDriverState *bs,
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int64_t offset, int count, BdrvRequestFlags flags);
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int coroutine_fn (*bdrv_co_pdiscard)(BlockDriverState *bs,
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int64_t offset, int count);
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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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BlockDriverState **file);
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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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int (*bdrv_inactivate)(BlockDriverState *bs);
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/*
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* Flushes all data for all layers by calling bdrv_co_flush for underlying
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* layers, if needed. This function is needed for deterministic
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* synchronization of the flush finishing callback.
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*/
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int coroutine_fn (*bdrv_co_flush)(BlockDriverState *bs);
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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 coroutine_fn (*bdrv_co_pwritev_compressed)(BlockDriverState *bs,
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uint64_t offset, uint64_t bytes, QEMUIOVector *qiov);
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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 coroutine_fn (*bdrv_save_vmstate)(BlockDriverState *bs,
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QEMUIOVector *qiov,
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int64_t pos);
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int coroutine_fn (*bdrv_load_vmstate)(BlockDriverState *bs,
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QEMUIOVector *qiov,
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int64_t pos);
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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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bool (*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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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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int coroutine_fn (*bdrv_co_ioctl)(BlockDriverState *bs,
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unsigned long int req, void *buf);
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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 *cb_opaque);
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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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/**
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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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/**
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* Drain and stop any internal sources of requests in the driver, and
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* remain so until next I/O callback (e.g. bdrv_co_writev) is called.
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*/
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void (*bdrv_drain)(BlockDriverState *bs);
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void (*bdrv_add_child)(BlockDriverState *parent, BlockDriverState *child,
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Error **errp);
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void (*bdrv_del_child)(BlockDriverState *parent, BdrvChild *child,
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Error **errp);
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QLIST_ENTRY(BlockDriver) list;
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};
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typedef struct BlockLimits {
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/* Alignment requirement, in bytes, for offset/length of I/O
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* requests. Must be a power of 2 less than INT_MAX; defaults to
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* 1 for drivers with modern byte interfaces, and to 512
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* otherwise. */
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uint32_t request_alignment;
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/* Maximum number of bytes that can be discarded at once (since it
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* is signed, it must be < 2G, if set). Must be multiple of
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* pdiscard_alignment, but need not be power of 2. May be 0 if no
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* inherent 32-bit limit */
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int32_t max_pdiscard;
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/* Optimal alignment for discard requests in bytes. A power of 2
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* is best but not mandatory. Must be a multiple of
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* bl.request_alignment, and must be less than max_pdiscard if
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* that is set. May be 0 if bl.request_alignment is good enough */
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uint32_t pdiscard_alignment;
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/* Maximum number of bytes that can zeroized at once (since it is
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* signed, it must be < 2G, if set). Must be multiple of
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* pwrite_zeroes_alignment. May be 0 if no inherent 32-bit limit */
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int32_t max_pwrite_zeroes;
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/* Optimal alignment for write zeroes requests in bytes. A power
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* of 2 is best but not mandatory. Must be a multiple of
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* bl.request_alignment, and must be less than max_pwrite_zeroes
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* if that is set. May be 0 if bl.request_alignment is good
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* enough */
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uint32_t pwrite_zeroes_alignment;
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/* Optimal transfer length in bytes. A power of 2 is best but not
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* mandatory. Must be a multiple of bl.request_alignment, or 0 if
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* no preferred size */
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uint32_t opt_transfer;
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/* Maximal transfer length in bytes. Need not be power of 2, but
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* must be multiple of opt_transfer and bl.request_alignment, or 0
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* for no 32-bit limit. For now, anything larger than INT_MAX is
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* clamped down. */
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uint32_t max_transfer;
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/* memory alignment, in bytes so that no bounce buffer is needed */
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size_t min_mem_alignment;
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/* memory alignment, in bytes, for bounce buffer */
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size_t opt_mem_alignment;
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/* maximum number of iovec elements */
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int max_iov;
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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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bool deleted;
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QLIST_ENTRY(BdrvAioNotifier) list;
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} BdrvAioNotifier;
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struct BdrvChildRole {
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void (*inherit_options)(int *child_flags, QDict *child_options,
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int parent_flags, QDict *parent_options);
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void (*change_media)(BdrvChild *child, bool load);
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void (*resize)(BdrvChild *child);
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/* Returns a name that is supposedly more useful for human users than the
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* node name for identifying the node in question (in particular, a BB
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* name), or NULL if the parent can't provide a better name. */
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const char* (*get_name)(BdrvChild *child);
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/*
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* If this pair of functions is implemented, the parent doesn't issue new
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* requests after returning from .drained_begin() until .drained_end() is
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* called.
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*
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* Note that this can be nested. If drained_begin() was called twice, new
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* I/O is allowed only after drained_end() was called twice, too.
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*/
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void (*drained_begin)(BdrvChild *child);
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void (*drained_end)(BdrvChild *child);
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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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char *name;
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const BdrvChildRole *role;
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void *opaque;
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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 open_flags; /* flags used to open the file, re-used for re-open */
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bool read_only; /* if true, the media is read only */
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bool encrypted; /* if true, the media is encrypted */
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bool valid_key; /* if true, a valid encryption key has been set */
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bool sg; /* if true, the device is a /dev/sg* */
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bool probed; /* if true, format was probed rather than specified */
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int copy_on_read; /* if nonzero, copy read backing sectors into image.
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note this is a reference count */
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CoQueue flush_queue; /* Serializing flush queue */
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bool active_flush_req; /* Flush request in flight? */
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unsigned int write_gen; /* Current data generation */
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unsigned int flushed_gen; /* Flushed write generation */
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BlockDriver *drv; /* NULL means no media */
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void *opaque;
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AioContext *aio_context; /* event loop used for fd handlers, timers, etc */
|
|
/* long-running tasks intended to always use the same AioContext as this
|
|
* BDS may register themselves in this list to be notified of changes
|
|
* regarding this BDS's context */
|
|
QLIST_HEAD(, BdrvAioNotifier) aio_notifiers;
|
|
bool walking_aio_notifiers; /* to make removal during iteration safe */
|
|
|
|
char filename[PATH_MAX];
|
|
char backing_file[PATH_MAX]; /* if non zero, the image is a diff of
|
|
this file image */
|
|
char backing_format[16]; /* if non-zero and backing_file exists */
|
|
|
|
QDict *full_open_options;
|
|
char exact_filename[PATH_MAX];
|
|
|
|
BdrvChild *backing;
|
|
BdrvChild *file;
|
|
|
|
/* Callback before write request is processed */
|
|
NotifierWithReturnList before_write_notifiers;
|
|
|
|
/* number of in-flight requests; overall and serialising */
|
|
unsigned int in_flight;
|
|
unsigned int serialising_in_flight;
|
|
|
|
bool wakeup;
|
|
|
|
/* Offset after the highest byte written to */
|
|
uint64_t wr_highest_offset;
|
|
|
|
/* I/O Limits */
|
|
BlockLimits bl;
|
|
|
|
/* Flags honored during pwrite (so far: BDRV_REQ_FUA) */
|
|
unsigned int supported_write_flags;
|
|
/* Flags honored during pwrite_zeroes (so far: BDRV_REQ_FUA,
|
|
* BDRV_REQ_MAY_UNMAP) */
|
|
unsigned int supported_zero_flags;
|
|
|
|
/* the following member gives a name to every node on the bs graph. */
|
|
char node_name[32];
|
|
/* element of the list of named nodes building the graph */
|
|
QTAILQ_ENTRY(BlockDriverState) node_list;
|
|
/* element of the list of all BlockDriverStates (all_bdrv_states) */
|
|
QTAILQ_ENTRY(BlockDriverState) bs_list;
|
|
/* element of the list of monitor-owned BDS */
|
|
QTAILQ_ENTRY(BlockDriverState) monitor_list;
|
|
QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
|
|
int refcnt;
|
|
|
|
QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;
|
|
|
|
/* operation blockers */
|
|
QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX];
|
|
|
|
/* long-running background operation */
|
|
BlockJob *job;
|
|
|
|
/* The node that this node inherited default options from (and a reopen on
|
|
* which can affect this node by changing these defaults). This is always a
|
|
* parent node of this node. */
|
|
BlockDriverState *inherits_from;
|
|
QLIST_HEAD(, BdrvChild) children;
|
|
QLIST_HEAD(, BdrvChild) parents;
|
|
|
|
QDict *options;
|
|
QDict *explicit_options;
|
|
BlockdevDetectZeroesOptions detect_zeroes;
|
|
|
|
/* The error object in use for blocking operations on backing_hd */
|
|
Error *backing_blocker;
|
|
|
|
/* threshold limit for writes, in bytes. "High water mark". */
|
|
uint64_t write_threshold_offset;
|
|
NotifierWithReturn write_threshold_notifier;
|
|
|
|
/* counters for nested bdrv_io_plug and bdrv_io_unplugged_begin */
|
|
unsigned io_plugged;
|
|
unsigned io_plug_disabled;
|
|
|
|
int quiesce_counter;
|
|
};
|
|
|
|
struct BlockBackendRootState {
|
|
int open_flags;
|
|
bool read_only;
|
|
BlockdevDetectZeroesOptions detect_zeroes;
|
|
};
|
|
|
|
typedef enum BlockMirrorBackingMode {
|
|
/* Reuse the existing backing chain from the source for the target.
|
|
* - sync=full: Set backing BDS to NULL.
|
|
* - sync=top: Use source's backing BDS.
|
|
* - sync=none: Use source as the backing BDS. */
|
|
MIRROR_SOURCE_BACKING_CHAIN,
|
|
|
|
/* Open the target's backing chain completely anew */
|
|
MIRROR_OPEN_BACKING_CHAIN,
|
|
|
|
/* Do not change the target's backing BDS after job completion */
|
|
MIRROR_LEAVE_BACKING_CHAIN,
|
|
} BlockMirrorBackingMode;
|
|
|
|
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;
|
|
|
|
int coroutine_fn bdrv_co_preadv(BdrvChild *child,
|
|
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
|
|
BdrvRequestFlags flags);
|
|
int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
|
|
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
|
|
BdrvRequestFlags flags);
|
|
|
|
int get_tmp_filename(char *filename, int size);
|
|
BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size,
|
|
const char *filename);
|
|
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/**
|
|
* bdrv_wakeup:
|
|
* @bs: The BlockDriverState for which an I/O operation has been completed.
|
|
*
|
|
* Wake up the main thread if it is waiting on BDRV_POLL_WHILE. During
|
|
* synchronous I/O on a BlockDriverState that is attached to another
|
|
* I/O thread, the main thread lets the I/O thread's event loop run,
|
|
* waiting for the I/O operation to complete. A bdrv_wakeup will wake
|
|
* up the main thread if necessary.
|
|
*
|
|
* Manual calls to bdrv_wakeup are rarely necessary, because
|
|
* bdrv_dec_in_flight already calls it.
|
|
*/
|
|
void bdrv_wakeup(BlockDriverState *bs);
|
|
|
|
#ifdef _WIN32
|
|
int is_windows_drive(const char *filename);
|
|
#endif
|
|
|
|
/**
|
|
* stream_start:
|
|
* @job_id: The id of the newly-created job, or %NULL to use the
|
|
* device name of @bs.
|
|
* @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.
|
|
* @backing_file_str: The file name that will be written to @bs as the
|
|
* 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.
|
|
* @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
|
|
* @backing_file_str in the written image and to @base in the live
|
|
* BlockDriverState.
|
|
*/
|
|
void stream_start(const char *job_id, BlockDriverState *bs,
|
|
BlockDriverState *base, const char *backing_file_str,
|
|
int64_t speed, BlockdevOnError on_error, Error **errp);
|
|
|
|
/**
|
|
* commit_start:
|
|
* @job_id: The id of the newly-created job, or %NULL to use the
|
|
* device name of @bs.
|
|
* @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.
|
|
* @backing_file_str: String to use as the backing file in @top's overlay
|
|
* @errp: Error object.
|
|
*
|
|
*/
|
|
void commit_start(const char *job_id, BlockDriverState *bs,
|
|
BlockDriverState *base, BlockDriverState *top, int64_t speed,
|
|
BlockdevOnError on_error, const char *backing_file_str,
|
|
Error **errp);
|
|
/**
|
|
* commit_active_start:
|
|
* @job_id: The id of the newly-created job, or %NULL to use the
|
|
* device name of @bs.
|
|
* @bs: Active block device to be committed.
|
|
* @base: Block device that will be written into, and become the new top.
|
|
* @creation_flags: Flags that control the behavior of the Job lifetime.
|
|
* See @BlockJobCreateFlags
|
|
* @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.
|
|
* @auto_complete: Auto complete the job.
|
|
*
|
|
*/
|
|
void commit_active_start(const char *job_id, BlockDriverState *bs,
|
|
BlockDriverState *base, int creation_flags,
|
|
int64_t speed, BlockdevOnError on_error,
|
|
BlockCompletionFunc *cb,
|
|
void *opaque, Error **errp, bool auto_complete);
|
|
/*
|
|
* mirror_start:
|
|
* @job_id: The id of the newly-created job, or %NULL to use the
|
|
* device name of @bs.
|
|
* @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.
|
|
* @backing_mode: How to establish the target's backing chain after completion.
|
|
* @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.
|
|
* @errp: Error object.
|
|
*
|
|
* Start a mirroring operation on @bs. Clusters that are allocated
|
|
* in @bs will be written to @target 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(const char *job_id, BlockDriverState *bs,
|
|
BlockDriverState *target, const char *replaces,
|
|
int64_t speed, uint32_t granularity, int64_t buf_size,
|
|
MirrorSyncMode mode, BlockMirrorBackingMode backing_mode,
|
|
BlockdevOnError on_source_error,
|
|
BlockdevOnError on_target_error,
|
|
bool unmap, Error **errp);
|
|
|
|
/*
|
|
* backup_start:
|
|
* @job_id: The id of the newly-created job, or %NULL to use the
|
|
* device name of @bs.
|
|
* @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.
|
|
* @creation_flags: Flags that control the behavior of the Job lifetime.
|
|
* See @BlockJobCreateFlags
|
|
* @cb: Completion function for the job.
|
|
* @opaque: Opaque pointer value passed to @cb.
|
|
* @txn: Transaction that this job is part of (may be NULL).
|
|
*
|
|
* Start a backup operation on @bs. Clusters in @bs are written to @target
|
|
* until the job is cancelled or manually completed.
|
|
*/
|
|
void backup_start(const char *job_id, BlockDriverState *bs,
|
|
BlockDriverState *target, int64_t speed,
|
|
MirrorSyncMode sync_mode, BdrvDirtyBitmap *sync_bitmap,
|
|
bool compress,
|
|
BlockdevOnError on_source_error,
|
|
BlockdevOnError on_target_error,
|
|
int creation_flags,
|
|
BlockCompletionFunc *cb, void *opaque,
|
|
BlockJobTxn *txn, Error **errp);
|
|
|
|
void hmp_drive_add_node(Monitor *mon, const char *optstr);
|
|
|
|
BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
|
|
const char *child_name,
|
|
const BdrvChildRole *child_role,
|
|
void *opaque);
|
|
void bdrv_root_unref_child(BdrvChild *child);
|
|
|
|
const char *bdrv_get_parent_name(const BlockDriverState *bs);
|
|
void blk_dev_change_media_cb(BlockBackend *blk, bool load);
|
|
bool blk_dev_has_removable_media(BlockBackend *blk);
|
|
bool blk_dev_has_tray(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 bdrv_set_dirty(BlockDriverState *bs, int64_t cur_sector, int64_t nr_sect);
|
|
bool bdrv_requests_pending(BlockDriverState *bs);
|
|
|
|
void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out);
|
|
void bdrv_undo_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *in);
|
|
|
|
void bdrv_inc_in_flight(BlockDriverState *bs);
|
|
void bdrv_dec_in_flight(BlockDriverState *bs);
|
|
|
|
void blockdev_close_all_bdrv_states(void);
|
|
|
|
#endif /* BLOCK_INT_H */
|