The next patch will split blockdev.c, which will require accessing some previously-static functions from more than one .c file. But part of promoting a function to public is picking a naming scheme that does not reek of exposing too many internals (two of the three functions were named starting with 'do_'). To make future code motion easier, perform the function rename and non-static promotion into its own patch. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200513011648.166876-5-eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
1360 lines
58 KiB
C
1360 lines
58 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 "block/aio-wait.h"
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#include "qemu/queue.h"
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#include "qemu/coroutine.h"
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#include "qemu/stats64.h"
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#include "qemu/timer.h"
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#include "qemu/hbitmap.h"
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#include "block/snapshot.h"
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#include "qemu/throttle.h"
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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_ENCRYPT_FORMAT "encrypt.format"
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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_OPT_DATA_FILE "data_file"
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#define BLOCK_OPT_DATA_FILE_RAW "data_file_raw"
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#define BLOCK_OPT_COMPRESSION_TYPE "compression_type"
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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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BDRV_TRACKED_TRUNCATE,
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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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uint64_t 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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uint64_t 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. Block filters pass
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* certain callbacks that refer to data (see block.c) to their bs->file if
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* the driver doesn't implement them. Drivers that do not wish to forward
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* must implement them and return -ENOTSUP.
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*/
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bool is_filter;
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/*
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* Set to true if the BlockDriver is a format driver. Format nodes
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* generally do not expect their children to be other format nodes
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* (except for backing files), and so format probing is disabled
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* on those children.
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*/
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bool is_format;
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/*
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* Return true if @to_replace can be replaced by a BDS with the
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* same data as @bs without it affecting @bs's behavior (that is,
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* without it being visible to @bs's parents).
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*/
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bool (*bdrv_recurse_can_replace)(BlockDriverState *bs,
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BlockDriverState *to_replace);
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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_commit_post)(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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/* Protocol drivers should implement this instead of bdrv_open */
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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 coroutine_fn (*bdrv_co_create)(BlockdevCreateOptions *opts,
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Error **errp);
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int coroutine_fn (*bdrv_co_create_opts)(BlockDriver *drv,
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const char *filename,
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QemuOpts *opts,
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Error **errp);
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int (*bdrv_make_empty)(BlockDriverState *bs);
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/*
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* Refreshes the bs->exact_filename field. If that is impossible,
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* bs->exact_filename has to be left empty.
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*/
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void (*bdrv_refresh_filename)(BlockDriverState *bs);
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/*
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* Gathers the open options for all children into @target.
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* A simple format driver (without backing file support) might
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* implement this function like this:
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*
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* QINCREF(bs->file->bs->full_open_options);
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* qdict_put(target, "file", bs->file->bs->full_open_options);
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*
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* If not specified, the generic implementation will simply put
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* all children's options under their respective name.
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*
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* @backing_overridden is true when bs->backing seems not to be
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* the child that would result from opening bs->backing_file.
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* Therefore, if it is true, the backing child's options should be
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* gathered; otherwise, there is no need since the backing child
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* is the one implied by the image header.
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*
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* Note that ideally this function would not be needed. Every
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* block driver which implements it is probably doing something
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* shady regarding its runtime option structure.
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*/
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void (*bdrv_gather_child_options)(BlockDriverState *bs, QDict *target,
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bool backing_overridden);
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/*
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* Returns an allocated string which is the directory name of this BDS: It
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* will be used to make relative filenames absolute by prepending this
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* function's return value to them.
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*/
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char *(*bdrv_dirname)(BlockDriverState *bs, Error **errp);
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/* aio */
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BlockAIOCB *(*bdrv_aio_preadv)(BlockDriverState *bs,
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uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags,
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BlockCompletionFunc *cb, void *opaque);
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BlockAIOCB *(*bdrv_aio_pwritev)(BlockDriverState *bs,
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uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags,
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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 bytes,
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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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/**
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* @offset: position in bytes to read at
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* @bytes: number of bytes to read
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* @qiov: the buffers to fill with read data
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* @flags: currently unused, always 0
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*
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* @offset and @bytes will be a multiple of 'request_alignment',
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* but the length of individual @qiov elements does not have to
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* be a multiple.
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*
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* @bytes will always equal the total size of @qiov, and will be
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* no larger than 'max_transfer'.
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*
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* The buffer in @qiov may point directly to guest memory.
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*/
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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_preadv_part)(BlockDriverState *bs,
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uint64_t offset, uint64_t bytes,
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QEMUIOVector *qiov, size_t qiov_offset, 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, int flags);
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/**
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* @offset: position in bytes to write at
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* @bytes: number of bytes to write
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* @qiov: the buffers containing data to write
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* @flags: zero or more bits allowed by 'supported_write_flags'
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*
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* @offset and @bytes will be a multiple of 'request_alignment',
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* but the length of individual @qiov elements does not have to
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* be a multiple.
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*
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* @bytes will always equal the total size of @qiov, and will be
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* no larger than 'max_transfer'.
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*
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* The buffer in @qiov may point directly to guest memory.
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*/
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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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int coroutine_fn (*bdrv_co_pwritev_part)(BlockDriverState *bs,
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uint64_t offset, uint64_t bytes,
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QEMUIOVector *qiov, size_t qiov_offset, 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 bytes, BdrvRequestFlags flags);
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int coroutine_fn (*bdrv_co_pdiscard)(BlockDriverState *bs,
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int64_t offset, int bytes);
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/* Map [offset, offset + nbytes) range onto a child of @bs to copy from,
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* and invoke bdrv_co_copy_range_from(child, ...), or invoke
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* bdrv_co_copy_range_to() if @bs is the leaf child to copy data from.
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*
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* See the comment of bdrv_co_copy_range for the parameter and return value
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* semantics.
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*/
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int coroutine_fn (*bdrv_co_copy_range_from)(BlockDriverState *bs,
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BdrvChild *src,
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uint64_t offset,
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BdrvChild *dst,
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uint64_t dst_offset,
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uint64_t bytes,
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BdrvRequestFlags read_flags,
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BdrvRequestFlags write_flags);
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/* Map [offset, offset + nbytes) range onto a child of bs to copy data to,
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* and invoke bdrv_co_copy_range_to(child, src, ...), or perform the copy
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* operation if @bs is the leaf and @src has the same BlockDriver. Return
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* -ENOTSUP if @bs is the leaf but @src has a different BlockDriver.
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*
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* See the comment of bdrv_co_copy_range for the parameter and return value
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* semantics.
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*/
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int coroutine_fn (*bdrv_co_copy_range_to)(BlockDriverState *bs,
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BdrvChild *src,
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uint64_t src_offset,
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BdrvChild *dst,
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uint64_t dst_offset,
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uint64_t bytes,
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BdrvRequestFlags read_flags,
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BdrvRequestFlags write_flags);
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/*
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* Building block for bdrv_block_status[_above] and
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* bdrv_is_allocated[_above]. The driver should answer only
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* according to the current layer, and should only need to set
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* BDRV_BLOCK_DATA, BDRV_BLOCK_ZERO, BDRV_BLOCK_OFFSET_VALID,
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* and/or BDRV_BLOCK_RAW; if the current layer defers to a backing
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* layer, the result should be 0 (and not BDRV_BLOCK_ZERO). See
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* block.h for the overall meaning of the bits. As a hint, the
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* flag want_zero is true if the caller cares more about precise
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* mappings (favor accurate _OFFSET_VALID/_ZERO) or false for
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* overall allocation (favor larger *pnum, perhaps by reporting
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* _DATA instead of _ZERO). The block layer guarantees input
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* clamped to bdrv_getlength() and aligned to request_alignment,
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* as well as non-NULL pnum, map, and file; in turn, the driver
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* must return an error or set pnum to an aligned non-zero value.
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*/
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int coroutine_fn (*bdrv_co_block_status)(BlockDriverState *bs,
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bool want_zero, int64_t offset, int64_t bytes, int64_t *pnum,
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int64_t *map, BlockDriverState **file);
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/*
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* Invalidate any cached meta-data.
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*/
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void coroutine_fn (*bdrv_co_invalidate_cache)(BlockDriverState *bs,
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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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/* Delete a created file. */
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int coroutine_fn (*bdrv_co_delete_file)(BlockDriverState *bs,
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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 file-posix.c 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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/*
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* Drivers setting this field must be able to work with just a plain
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* filename with '<protocol_name>:' as a prefix, and no other options.
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* Options may be extracted from the filename by implementing
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* bdrv_parse_filename.
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*/
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const char *protocol_name;
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/*
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* Truncate @bs to @offset bytes using the given @prealloc mode
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* when growing. Modes other than PREALLOC_MODE_OFF should be
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* rejected when shrinking @bs.
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*
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* If @exact is true, @bs must be resized to exactly @offset.
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* Otherwise, it is sufficient for @bs (if it is a host block
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* device and thus there is no way to resize it) to be at least
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* @offset bytes in length.
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*
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* If @exact is true and this function fails but would succeed
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* with @exact = false, it should return -ENOTSUP.
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*/
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int coroutine_fn (*bdrv_co_truncate)(BlockDriverState *bs, int64_t offset,
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bool exact, PreallocMode prealloc,
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BdrvRequestFlags flags, Error **errp);
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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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BlockMeasureInfo *(*bdrv_measure)(QemuOpts *opts, BlockDriverState *in_bs,
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Error **errp);
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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 coroutine_fn (*bdrv_co_pwritev_compressed_part)(BlockDriverState *bs,
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uint64_t offset, uint64_t bytes, QEMUIOVector *qiov,
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size_t qiov_offset);
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|
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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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Error **errp);
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BlockStatsSpecific *(*bdrv_get_specific_stats)(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);
|
|
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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void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag);
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void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked);
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|
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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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|
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/* List of options for creating images, terminated by name == NULL */
|
|
QemuOptsList *create_opts;
|
|
/*
|
|
* If this driver supports reopening images this contains a
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|
* NULL-terminated list of the runtime options that can be
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* modified. If an option in this list is unspecified during
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* reopen then it _must_ be reset to its default value or return
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* an error.
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|
*/
|
|
const char *const *mutable_opts;
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|
|
|
/*
|
|
* Returns 0 for completed check, -errno for internal errors.
|
|
* The check results are stored in result.
|
|
*/
|
|
int coroutine_fn (*bdrv_co_check)(BlockDriverState *bs,
|
|
BdrvCheckResult *result,
|
|
BdrvCheckMode fix);
|
|
|
|
int (*bdrv_amend_options)(BlockDriverState *bs, QemuOpts *opts,
|
|
BlockDriverAmendStatusCB *status_cb,
|
|
void *cb_opaque,
|
|
Error **errp);
|
|
|
|
void (*bdrv_debug_event)(BlockDriverState *bs, BlkdebugEvent event);
|
|
|
|
/* TODO Better pass a option string/QDict/QemuOpts to add any rule? */
|
|
int (*bdrv_debug_breakpoint)(BlockDriverState *bs, const char *event,
|
|
const char *tag);
|
|
int (*bdrv_debug_remove_breakpoint)(BlockDriverState *bs,
|
|
const char *tag);
|
|
int (*bdrv_debug_resume)(BlockDriverState *bs, const char *tag);
|
|
bool (*bdrv_debug_is_suspended)(BlockDriverState *bs, const char *tag);
|
|
|
|
void (*bdrv_refresh_limits)(BlockDriverState *bs, Error **errp);
|
|
|
|
/*
|
|
* Returns 1 if newly created images are guaranteed to contain only
|
|
* zeros, 0 otherwise.
|
|
*/
|
|
int (*bdrv_has_zero_init)(BlockDriverState *bs);
|
|
|
|
/* Remove fd handlers, timers, and other event loop callbacks so the event
|
|
* loop is no longer in use. Called with no in-flight requests and in
|
|
* depth-first traversal order with parents before child nodes.
|
|
*/
|
|
void (*bdrv_detach_aio_context)(BlockDriverState *bs);
|
|
|
|
/* Add fd handlers, timers, and other event loop callbacks so I/O requests
|
|
* can be processed again. Called with no in-flight requests and in
|
|
* depth-first traversal order with child nodes before parent nodes.
|
|
*/
|
|
void (*bdrv_attach_aio_context)(BlockDriverState *bs,
|
|
AioContext *new_context);
|
|
|
|
/* io queue for linux-aio */
|
|
void (*bdrv_io_plug)(BlockDriverState *bs);
|
|
void (*bdrv_io_unplug)(BlockDriverState *bs);
|
|
|
|
/**
|
|
* Try to get @bs's logical and physical block size.
|
|
* On success, store them in @bsz and return zero.
|
|
* On failure, return negative errno.
|
|
*/
|
|
int (*bdrv_probe_blocksizes)(BlockDriverState *bs, BlockSizes *bsz);
|
|
/**
|
|
* Try to get @bs's geometry (cyls, heads, sectors)
|
|
* On success, store them in @geo and return 0.
|
|
* On failure return -errno.
|
|
* Only drivers that want to override guest geometry implement this
|
|
* callback; see hd_geometry_guess().
|
|
*/
|
|
int (*bdrv_probe_geometry)(BlockDriverState *bs, HDGeometry *geo);
|
|
|
|
/**
|
|
* bdrv_co_drain_begin is called if implemented in the beginning of a
|
|
* drain operation to drain and stop any internal sources of requests in
|
|
* the driver.
|
|
* bdrv_co_drain_end is called if implemented at the end of the drain.
|
|
*
|
|
* They should be used by the driver to e.g. manage scheduled I/O
|
|
* requests, or toggle an internal state. After the end of the drain new
|
|
* requests will continue normally.
|
|
*/
|
|
void coroutine_fn (*bdrv_co_drain_begin)(BlockDriverState *bs);
|
|
void coroutine_fn (*bdrv_co_drain_end)(BlockDriverState *bs);
|
|
|
|
void (*bdrv_add_child)(BlockDriverState *parent, BlockDriverState *child,
|
|
Error **errp);
|
|
void (*bdrv_del_child)(BlockDriverState *parent, BdrvChild *child,
|
|
Error **errp);
|
|
|
|
/**
|
|
* Informs the block driver that a permission change is intended. The
|
|
* driver checks whether the change is permissible and may take other
|
|
* preparations for the change (e.g. get file system locks). This operation
|
|
* is always followed either by a call to either .bdrv_set_perm or
|
|
* .bdrv_abort_perm_update.
|
|
*
|
|
* Checks whether the requested set of cumulative permissions in @perm
|
|
* can be granted for accessing @bs and whether no other users are using
|
|
* permissions other than those given in @shared (both arguments take
|
|
* BLK_PERM_* bitmasks).
|
|
*
|
|
* If both conditions are met, 0 is returned. Otherwise, -errno is returned
|
|
* and errp is set to an error describing the conflict.
|
|
*/
|
|
int (*bdrv_check_perm)(BlockDriverState *bs, uint64_t perm,
|
|
uint64_t shared, Error **errp);
|
|
|
|
/**
|
|
* Called to inform the driver that the set of cumulative set of used
|
|
* permissions for @bs has changed to @perm, and the set of sharable
|
|
* permission to @shared. The driver can use this to propagate changes to
|
|
* its children (i.e. request permissions only if a parent actually needs
|
|
* them).
|
|
*
|
|
* This function is only invoked after bdrv_check_perm(), so block drivers
|
|
* may rely on preparations made in their .bdrv_check_perm implementation.
|
|
*/
|
|
void (*bdrv_set_perm)(BlockDriverState *bs, uint64_t perm, uint64_t shared);
|
|
|
|
/*
|
|
* Called to inform the driver that after a previous bdrv_check_perm()
|
|
* call, the permission update is not performed and any preparations made
|
|
* for it (e.g. taken file locks) need to be undone.
|
|
*
|
|
* This function can be called even for nodes that never saw a
|
|
* bdrv_check_perm() call. It is a no-op then.
|
|
*/
|
|
void (*bdrv_abort_perm_update)(BlockDriverState *bs);
|
|
|
|
/**
|
|
* Returns in @nperm and @nshared the permissions that the driver for @bs
|
|
* needs on its child @c, based on the cumulative permissions requested by
|
|
* the parents in @parent_perm and @parent_shared.
|
|
*
|
|
* If @c is NULL, return the permissions for attaching a new child for the
|
|
* given @child_class and @role.
|
|
*
|
|
* If @reopen_queue is non-NULL, don't return the currently needed
|
|
* permissions, but those that will be needed after applying the
|
|
* @reopen_queue.
|
|
*/
|
|
void (*bdrv_child_perm)(BlockDriverState *bs, BdrvChild *c,
|
|
BdrvChildRole role,
|
|
BlockReopenQueue *reopen_queue,
|
|
uint64_t parent_perm, uint64_t parent_shared,
|
|
uint64_t *nperm, uint64_t *nshared);
|
|
|
|
bool (*bdrv_supports_persistent_dirty_bitmap)(BlockDriverState *bs);
|
|
bool (*bdrv_co_can_store_new_dirty_bitmap)(BlockDriverState *bs,
|
|
const char *name,
|
|
uint32_t granularity,
|
|
Error **errp);
|
|
int (*bdrv_co_remove_persistent_dirty_bitmap)(BlockDriverState *bs,
|
|
const char *name,
|
|
Error **errp);
|
|
|
|
/**
|
|
* Register/unregister a buffer for I/O. For example, when the driver is
|
|
* interested to know the memory areas that will later be used in iovs, so
|
|
* that it can do IOMMU mapping with VFIO etc., in order to get better
|
|
* performance. In the case of VFIO drivers, this callback is used to do
|
|
* DMA mapping for hot buffers.
|
|
*/
|
|
void (*bdrv_register_buf)(BlockDriverState *bs, void *host, size_t size);
|
|
void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host);
|
|
QLIST_ENTRY(BlockDriver) list;
|
|
|
|
/* Pointer to a NULL-terminated array of names of strong options
|
|
* that can be specified for bdrv_open(). A strong option is one
|
|
* that changes the data of a BDS.
|
|
* If this pointer is NULL, the array is considered empty.
|
|
* "filename" and "driver" are always considered strong. */
|
|
const char *const *strong_runtime_opts;
|
|
};
|
|
|
|
static inline bool block_driver_can_compress(BlockDriver *drv)
|
|
{
|
|
return drv->bdrv_co_pwritev_compressed ||
|
|
drv->bdrv_co_pwritev_compressed_part;
|
|
}
|
|
|
|
typedef struct BlockLimits {
|
|
/* Alignment requirement, in bytes, for offset/length of I/O
|
|
* requests. Must be a power of 2 less than INT_MAX; defaults to
|
|
* 1 for drivers with modern byte interfaces, and to 512
|
|
* otherwise. */
|
|
uint32_t request_alignment;
|
|
|
|
/* Maximum number of bytes that can be discarded at once (since it
|
|
* is signed, it must be < 2G, if set). Must be multiple of
|
|
* pdiscard_alignment, but need not be power of 2. May be 0 if no
|
|
* inherent 32-bit limit */
|
|
int32_t max_pdiscard;
|
|
|
|
/* Optimal alignment for discard requests in bytes. A power of 2
|
|
* is best but not mandatory. Must be a multiple of
|
|
* bl.request_alignment, and must be less than max_pdiscard if
|
|
* that is set. May be 0 if bl.request_alignment is good enough */
|
|
uint32_t pdiscard_alignment;
|
|
|
|
/* Maximum number of bytes that can zeroized at once (since it is
|
|
* signed, it must be < 2G, if set). Must be multiple of
|
|
* pwrite_zeroes_alignment. May be 0 if no inherent 32-bit limit */
|
|
int32_t max_pwrite_zeroes;
|
|
|
|
/* Optimal alignment for write zeroes requests in bytes. A power
|
|
* of 2 is best but not mandatory. Must be a multiple of
|
|
* bl.request_alignment, and must be less than max_pwrite_zeroes
|
|
* if that is set. May be 0 if bl.request_alignment is good
|
|
* enough */
|
|
uint32_t pwrite_zeroes_alignment;
|
|
|
|
/* Optimal transfer length in bytes. A power of 2 is best but not
|
|
* mandatory. Must be a multiple of bl.request_alignment, or 0 if
|
|
* no preferred size */
|
|
uint32_t opt_transfer;
|
|
|
|
/* Maximal transfer length in bytes. Need not be power of 2, but
|
|
* must be multiple of opt_transfer and bl.request_alignment, or 0
|
|
* for no 32-bit limit. For now, anything larger than INT_MAX is
|
|
* clamped down. */
|
|
uint32_t max_transfer;
|
|
|
|
/* memory alignment, in bytes so that no bounce buffer is needed */
|
|
size_t min_mem_alignment;
|
|
|
|
/* memory alignment, in bytes, for bounce buffer */
|
|
size_t opt_mem_alignment;
|
|
|
|
/* maximum number of iovec elements */
|
|
int max_iov;
|
|
} BlockLimits;
|
|
|
|
typedef struct BdrvOpBlocker BdrvOpBlocker;
|
|
|
|
typedef struct BdrvAioNotifier {
|
|
void (*attached_aio_context)(AioContext *new_context, void *opaque);
|
|
void (*detach_aio_context)(void *opaque);
|
|
|
|
void *opaque;
|
|
bool deleted;
|
|
|
|
QLIST_ENTRY(BdrvAioNotifier) list;
|
|
} BdrvAioNotifier;
|
|
|
|
struct BdrvChildClass {
|
|
/* If true, bdrv_replace_node() doesn't change the node this BdrvChild
|
|
* points to. */
|
|
bool stay_at_node;
|
|
|
|
/* If true, the parent is a BlockDriverState and bdrv_next_all_states()
|
|
* will return it. This information is used for drain_all, where every node
|
|
* will be drained separately, so the drain only needs to be propagated to
|
|
* non-BDS parents. */
|
|
bool parent_is_bds;
|
|
|
|
void (*inherit_options)(BdrvChildRole role, bool parent_is_format,
|
|
int *child_flags, QDict *child_options,
|
|
int parent_flags, QDict *parent_options);
|
|
|
|
void (*change_media)(BdrvChild *child, bool load);
|
|
void (*resize)(BdrvChild *child);
|
|
|
|
/* Returns a name that is supposedly more useful for human users than the
|
|
* node name for identifying the node in question (in particular, a BB
|
|
* name), or NULL if the parent can't provide a better name. */
|
|
const char *(*get_name)(BdrvChild *child);
|
|
|
|
/* Returns a malloced string that describes the parent of the child for a
|
|
* human reader. This could be a node-name, BlockBackend name, qdev ID or
|
|
* QOM path of the device owning the BlockBackend, job type and ID etc. The
|
|
* caller is responsible for freeing the memory. */
|
|
char *(*get_parent_desc)(BdrvChild *child);
|
|
|
|
/*
|
|
* If this pair of functions is implemented, the parent doesn't issue new
|
|
* requests after returning from .drained_begin() until .drained_end() is
|
|
* called.
|
|
*
|
|
* These functions must not change the graph (and therefore also must not
|
|
* call aio_poll(), which could change the graph indirectly).
|
|
*
|
|
* If drained_end() schedules background operations, it must atomically
|
|
* increment *drained_end_counter for each such operation and atomically
|
|
* decrement it once the operation has settled.
|
|
*
|
|
* Note that this can be nested. If drained_begin() was called twice, new
|
|
* I/O is allowed only after drained_end() was called twice, too.
|
|
*/
|
|
void (*drained_begin)(BdrvChild *child);
|
|
void (*drained_end)(BdrvChild *child, int *drained_end_counter);
|
|
|
|
/*
|
|
* Returns whether the parent has pending requests for the child. This
|
|
* callback is polled after .drained_begin() has been called until all
|
|
* activity on the child has stopped.
|
|
*/
|
|
bool (*drained_poll)(BdrvChild *child);
|
|
|
|
/* Notifies the parent that the child has been activated/inactivated (e.g.
|
|
* when migration is completing) and it can start/stop requesting
|
|
* permissions and doing I/O on it. */
|
|
void (*activate)(BdrvChild *child, Error **errp);
|
|
int (*inactivate)(BdrvChild *child);
|
|
|
|
void (*attach)(BdrvChild *child);
|
|
void (*detach)(BdrvChild *child);
|
|
|
|
/* Notifies the parent that the filename of its child has changed (e.g.
|
|
* because the direct child was removed from the backing chain), so that it
|
|
* can update its reference. */
|
|
int (*update_filename)(BdrvChild *child, BlockDriverState *new_base,
|
|
const char *filename, Error **errp);
|
|
|
|
bool (*can_set_aio_ctx)(BdrvChild *child, AioContext *ctx,
|
|
GSList **ignore, Error **errp);
|
|
void (*set_aio_ctx)(BdrvChild *child, AioContext *ctx, GSList **ignore);
|
|
};
|
|
|
|
extern const BdrvChildClass child_of_bds;
|
|
|
|
struct BdrvChild {
|
|
BlockDriverState *bs;
|
|
char *name;
|
|
const BdrvChildClass *klass;
|
|
BdrvChildRole role;
|
|
void *opaque;
|
|
|
|
/**
|
|
* Granted permissions for operating on this BdrvChild (BLK_PERM_* bitmask)
|
|
*/
|
|
uint64_t perm;
|
|
|
|
/**
|
|
* Permissions that can still be granted to other users of @bs while this
|
|
* BdrvChild is still attached to it. (BLK_PERM_* bitmask)
|
|
*/
|
|
uint64_t shared_perm;
|
|
|
|
/* backup of permissions during permission update procedure */
|
|
bool has_backup_perm;
|
|
uint64_t backup_perm;
|
|
uint64_t backup_shared_perm;
|
|
|
|
/*
|
|
* This link is frozen: the child can neither be replaced nor
|
|
* detached from the parent.
|
|
*/
|
|
bool frozen;
|
|
|
|
/*
|
|
* How many times the parent of this child has been drained
|
|
* (through klass->drained_*).
|
|
* Usually, this is equal to bs->quiesce_counter (potentially
|
|
* reduced by bdrv_drain_all_count). It may differ while the
|
|
* child is entering or leaving a drained section.
|
|
*/
|
|
int parent_quiesce_counter;
|
|
|
|
QLIST_ENTRY(BdrvChild) next;
|
|
QLIST_ENTRY(BdrvChild) next_parent;
|
|
};
|
|
|
|
/*
|
|
* Note: the function bdrv_append() copies and swaps contents of
|
|
* BlockDriverStates, so if you add new fields to this struct, please
|
|
* inspect bdrv_append() to determine if the new fields need to be
|
|
* copied as well.
|
|
*/
|
|
struct BlockDriverState {
|
|
/* Protected by big QEMU lock or read-only after opening. No special
|
|
* locking needed during I/O...
|
|
*/
|
|
int open_flags; /* flags used to open the file, re-used for re-open */
|
|
bool read_only; /* if true, the media is read only */
|
|
bool encrypted; /* if true, the media is encrypted */
|
|
bool sg; /* if true, the device is a /dev/sg* */
|
|
bool probed; /* if true, format was probed rather than specified */
|
|
bool force_share; /* if true, always allow all shared permissions */
|
|
bool implicit; /* if true, this filter node was automatically inserted */
|
|
|
|
BlockDriver *drv; /* NULL means no media */
|
|
void *opaque;
|
|
|
|
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 */
|
|
/* The backing filename indicated by the image header; if we ever
|
|
* open this file, then this is replaced by the resulting BDS's
|
|
* filename (i.e. after a bdrv_refresh_filename() run). */
|
|
char auto_backing_file[PATH_MAX];
|
|
char backing_format[16]; /* if non-zero and backing_file exists */
|
|
|
|
QDict *full_open_options;
|
|
char exact_filename[PATH_MAX];
|
|
|
|
BdrvChild *backing;
|
|
BdrvChild *file;
|
|
|
|
/* I/O Limits */
|
|
BlockLimits bl;
|
|
|
|
/* Flags honored during pwrite (so far: BDRV_REQ_FUA,
|
|
* BDRV_REQ_WRITE_UNCHANGED).
|
|
* If a driver does not support BDRV_REQ_WRITE_UNCHANGED, those
|
|
* writes will be issued as normal writes without the flag set.
|
|
* This is important to note for drivers that do not explicitly
|
|
* request a WRITE permission for their children and instead take
|
|
* the same permissions as their parent did (this is commonly what
|
|
* block filters do). Such drivers have to be aware that the
|
|
* parent may have taken a WRITE_UNCHANGED permission only and is
|
|
* issuing such requests. Drivers either must make sure that
|
|
* these requests do not result in plain WRITE accesses (usually
|
|
* by supporting BDRV_REQ_WRITE_UNCHANGED, and then forwarding
|
|
* every incoming write request as-is, including potentially that
|
|
* flag), or they have to explicitly take the WRITE permission for
|
|
* their children. */
|
|
unsigned int supported_write_flags;
|
|
/* Flags honored during pwrite_zeroes (so far: BDRV_REQ_FUA,
|
|
* BDRV_REQ_MAY_UNMAP, BDRV_REQ_WRITE_UNCHANGED) */
|
|
unsigned int supported_zero_flags;
|
|
/*
|
|
* Flags honoured during truncate (so far: BDRV_REQ_ZERO_WRITE).
|
|
*
|
|
* If BDRV_REQ_ZERO_WRITE is given, the truncate operation must make sure
|
|
* that any added space reads as all zeros. If this can't be guaranteed,
|
|
* the operation must fail.
|
|
*/
|
|
unsigned int supported_truncate_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;
|
|
int refcnt;
|
|
|
|
/* operation blockers */
|
|
QLIST_HEAD(, BdrvOpBlocker) op_blockers[BLOCK_OP_TYPE_MAX];
|
|
|
|
/* 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;
|
|
|
|
/* Protected by AioContext lock */
|
|
|
|
/* If we are reading a disk image, give its size in sectors.
|
|
* Generally read-only; it is written to by load_snapshot and
|
|
* save_snaphost, but the block layer is quiescent during those.
|
|
*/
|
|
int64_t total_sectors;
|
|
|
|
/* Callback before write request is processed */
|
|
NotifierWithReturnList before_write_notifiers;
|
|
|
|
/* threshold limit for writes, in bytes. "High water mark". */
|
|
uint64_t write_threshold_offset;
|
|
NotifierWithReturn write_threshold_notifier;
|
|
|
|
/* Writing to the list requires the BQL _and_ the dirty_bitmap_mutex.
|
|
* Reading from the list can be done with either the BQL or the
|
|
* dirty_bitmap_mutex. Modifying a bitmap only requires
|
|
* dirty_bitmap_mutex. */
|
|
QemuMutex dirty_bitmap_mutex;
|
|
QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
|
|
|
|
/* Offset after the highest byte written to */
|
|
Stat64 wr_highest_offset;
|
|
|
|
/* If true, copy read backing sectors into image. Can be >1 if more
|
|
* than one client has requested copy-on-read. Accessed with atomic
|
|
* ops.
|
|
*/
|
|
int copy_on_read;
|
|
|
|
/* number of in-flight requests; overall and serialising.
|
|
* Accessed with atomic ops.
|
|
*/
|
|
unsigned int in_flight;
|
|
unsigned int serialising_in_flight;
|
|
|
|
/* counter for nested bdrv_io_plug.
|
|
* Accessed with atomic ops.
|
|
*/
|
|
unsigned io_plugged;
|
|
|
|
/* do we need to tell the quest if we have a volatile write cache? */
|
|
int enable_write_cache;
|
|
|
|
/* Accessed with atomic ops. */
|
|
int quiesce_counter;
|
|
int recursive_quiesce_counter;
|
|
|
|
unsigned int write_gen; /* Current data generation */
|
|
|
|
/* Protected by reqs_lock. */
|
|
CoMutex reqs_lock;
|
|
QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;
|
|
CoQueue flush_queue; /* Serializing flush queue */
|
|
bool active_flush_req; /* Flush request in flight? */
|
|
|
|
/* Only read/written by whoever has set active_flush_req to true. */
|
|
unsigned int flushed_gen; /* Flushed write generation */
|
|
|
|
/* BdrvChild links to this node may never be frozen */
|
|
bool never_freeze;
|
|
};
|
|
|
|
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_preadv_part(BdrvChild *child,
|
|
int64_t offset, unsigned int bytes,
|
|
QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags);
|
|
int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
|
|
int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
|
|
BdrvRequestFlags flags);
|
|
int coroutine_fn bdrv_co_pwritev_part(BdrvChild *child,
|
|
int64_t offset, unsigned int bytes,
|
|
QEMUIOVector *qiov, size_t qiov_offset, BdrvRequestFlags flags);
|
|
|
|
static inline int coroutine_fn bdrv_co_pread(BdrvChild *child,
|
|
int64_t offset, unsigned int bytes, void *buf, BdrvRequestFlags flags)
|
|
{
|
|
QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
|
|
|
|
return bdrv_co_preadv(child, offset, bytes, &qiov, flags);
|
|
}
|
|
|
|
static inline int coroutine_fn bdrv_co_pwrite(BdrvChild *child,
|
|
int64_t offset, unsigned int bytes, void *buf, BdrvRequestFlags flags)
|
|
{
|
|
QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
|
|
|
|
return bdrv_co_pwritev(child, offset, bytes, &qiov, flags);
|
|
}
|
|
|
|
extern unsigned int bdrv_drain_all_count;
|
|
void bdrv_apply_subtree_drain(BdrvChild *child, BlockDriverState *new_parent);
|
|
void bdrv_unapply_subtree_drain(BdrvChild *child, BlockDriverState *old_parent);
|
|
|
|
bool coroutine_fn bdrv_mark_request_serialising(BdrvTrackedRequest *req, uint64_t align);
|
|
BdrvTrackedRequest *coroutine_fn bdrv_co_get_self_request(BlockDriverState *bs);
|
|
|
|
int get_tmp_filename(char *filename, int size);
|
|
BlockDriver *bdrv_probe_all(const uint8_t *buf, int buf_size,
|
|
const char *filename);
|
|
|
|
void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix,
|
|
QDict *options);
|
|
|
|
|
|
/**
|
|
* 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_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.
|
|
* @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.
|
|
* @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,
|
|
int creation_flags, 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.
|
|
* @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.
|
|
* @backing_file_str: String to use as the backing file in @top's overlay
|
|
* @filter_node_name: The node name that should be assigned to the filter
|
|
* driver that the commit job inserts into the graph above @top. NULL means
|
|
* that a node name should be autogenerated.
|
|
* @errp: Error object.
|
|
*
|
|
*/
|
|
void commit_start(const char *job_id, BlockDriverState *bs,
|
|
BlockDriverState *base, BlockDriverState *top,
|
|
int creation_flags, int64_t speed,
|
|
BlockdevOnError on_error, const char *backing_file_str,
|
|
const char *filter_node_name, 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.
|
|
* @filter_node_name: The node name that should be assigned to the filter
|
|
* driver that the commit job inserts into the graph above @bs. NULL means that
|
|
* a node name should be autogenerated.
|
|
* @cb: Completion function for the job.
|
|
* @opaque: Opaque pointer value passed to @cb.
|
|
* @auto_complete: Auto complete the job.
|
|
* @errp: Error object.
|
|
*
|
|
*/
|
|
BlockJob *commit_active_start(const char *job_id, BlockDriverState *bs,
|
|
BlockDriverState *base, int creation_flags,
|
|
int64_t speed, BlockdevOnError on_error,
|
|
const char *filter_node_name,
|
|
BlockCompletionFunc *cb, void *opaque,
|
|
bool auto_complete, Error **errp);
|
|
/*
|
|
* 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.
|
|
* @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.
|
|
* @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.
|
|
* @zero_target: Whether the target should be explicitly zero-initialized
|
|
* @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.
|
|
* @filter_node_name: The node name that should be assigned to the filter
|
|
* driver that the mirror job inserts into the graph above @bs. NULL means that
|
|
* a node name should be autogenerated.
|
|
* @copy_mode: When to trigger writes to the target.
|
|
* @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,
|
|
int creation_flags, int64_t speed,
|
|
uint32_t granularity, int64_t buf_size,
|
|
MirrorSyncMode mode, BlockMirrorBackingMode backing_mode,
|
|
bool zero_target,
|
|
BlockdevOnError on_source_error,
|
|
BlockdevOnError on_target_error,
|
|
bool unmap, const char *filter_node_name,
|
|
MirrorCopyMode copy_mode, Error **errp);
|
|
|
|
/*
|
|
* backup_job_create:
|
|
* @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 'bitmap' or 'incremental'
|
|
* @bitmap_mode: The bitmap synchronization policy to use.
|
|
* @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).
|
|
*
|
|
* Create a backup operation on @bs. Clusters in @bs are written to @target
|
|
* until the job is cancelled or manually completed.
|
|
*/
|
|
BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs,
|
|
BlockDriverState *target, int64_t speed,
|
|
MirrorSyncMode sync_mode,
|
|
BdrvDirtyBitmap *sync_bitmap,
|
|
BitmapSyncMode bitmap_mode,
|
|
bool compress,
|
|
const char *filter_node_name,
|
|
BlockdevOnError on_source_error,
|
|
BlockdevOnError on_target_error,
|
|
int creation_flags,
|
|
BlockCompletionFunc *cb, void *opaque,
|
|
JobTxn *txn, Error **errp);
|
|
|
|
BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
|
|
const char *child_name,
|
|
const BdrvChildClass *child_class,
|
|
BdrvChildRole child_role,
|
|
AioContext *ctx,
|
|
uint64_t perm, uint64_t shared_perm,
|
|
void *opaque, Error **errp);
|
|
void bdrv_root_unref_child(BdrvChild *child);
|
|
|
|
void bdrv_get_cumulative_perm(BlockDriverState *bs, uint64_t *perm,
|
|
uint64_t *shared_perm);
|
|
|
|
/**
|
|
* Sets a BdrvChild's permissions. Avoid if the parent is a BDS; use
|
|
* bdrv_child_refresh_perms() instead and make the parent's
|
|
* .bdrv_child_perm() implementation return the correct values.
|
|
*/
|
|
int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared,
|
|
Error **errp);
|
|
|
|
/**
|
|
* Calls bs->drv->bdrv_child_perm() and updates the child's permission
|
|
* masks with the result.
|
|
* Drivers should invoke this function whenever an event occurs that
|
|
* makes their .bdrv_child_perm() implementation return different
|
|
* values than before, but which will not result in the block layer
|
|
* automatically refreshing the permissions.
|
|
*/
|
|
int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp);
|
|
|
|
bool bdrv_recurse_can_replace(BlockDriverState *bs,
|
|
BlockDriverState *to_replace);
|
|
|
|
/*
|
|
* Default implementation for BlockDriver.bdrv_child_perm() that can
|
|
* be used by block filters and image formats, as long as they use the
|
|
* child_of_bds child class and set an appropriate BdrvChildRole.
|
|
*/
|
|
void bdrv_default_perms(BlockDriverState *bs, BdrvChild *c,
|
|
BdrvChildRole role, BlockReopenQueue *reopen_queue,
|
|
uint64_t perm, uint64_t shared,
|
|
uint64_t *nperm, uint64_t *nshared);
|
|
|
|
/*
|
|
* Default implementation for drivers to pass bdrv_co_block_status() to
|
|
* their file.
|
|
*/
|
|
int coroutine_fn bdrv_co_block_status_from_file(BlockDriverState *bs,
|
|
bool want_zero,
|
|
int64_t offset,
|
|
int64_t bytes,
|
|
int64_t *pnum,
|
|
int64_t *map,
|
|
BlockDriverState **file);
|
|
/*
|
|
* Default implementation for drivers to pass bdrv_co_block_status() to
|
|
* their backing file.
|
|
*/
|
|
int coroutine_fn bdrv_co_block_status_from_backing(BlockDriverState *bs,
|
|
bool want_zero,
|
|
int64_t offset,
|
|
int64_t bytes,
|
|
int64_t *pnum,
|
|
int64_t *map,
|
|
BlockDriverState **file);
|
|
const char *bdrv_get_parent_name(const BlockDriverState *bs);
|
|
void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp);
|
|
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 offset, int64_t bytes);
|
|
|
|
void bdrv_clear_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap **out);
|
|
void bdrv_restore_dirty_bitmap(BdrvDirtyBitmap *bitmap, HBitmap *backup);
|
|
bool bdrv_dirty_bitmap_merge_internal(BdrvDirtyBitmap *dest,
|
|
const BdrvDirtyBitmap *src,
|
|
HBitmap **backup, bool lock);
|
|
|
|
void bdrv_inc_in_flight(BlockDriverState *bs);
|
|
void bdrv_dec_in_flight(BlockDriverState *bs);
|
|
|
|
void blockdev_close_all_bdrv_states(void);
|
|
|
|
int coroutine_fn bdrv_co_copy_range_from(BdrvChild *src, uint64_t src_offset,
|
|
BdrvChild *dst, uint64_t dst_offset,
|
|
uint64_t bytes,
|
|
BdrvRequestFlags read_flags,
|
|
BdrvRequestFlags write_flags);
|
|
int coroutine_fn bdrv_co_copy_range_to(BdrvChild *src, uint64_t src_offset,
|
|
BdrvChild *dst, uint64_t dst_offset,
|
|
uint64_t bytes,
|
|
BdrvRequestFlags read_flags,
|
|
BdrvRequestFlags write_flags);
|
|
|
|
int refresh_total_sectors(BlockDriverState *bs, int64_t hint);
|
|
|
|
void bdrv_set_monitor_owned(BlockDriverState *bs);
|
|
BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp);
|
|
|
|
/**
|
|
* Simple implementation of bdrv_co_create_opts for protocol drivers
|
|
* which only support creation via opening a file
|
|
* (usually existing raw storage device)
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|
*/
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|
int coroutine_fn bdrv_co_create_opts_simple(BlockDriver *drv,
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|
const char *filename,
|
|
QemuOpts *opts,
|
|
Error **errp);
|
|
extern QemuOptsList bdrv_create_opts_simple;
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|
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|
BdrvDirtyBitmap *block_dirty_bitmap_lookup(const char *node,
|
|
const char *name,
|
|
BlockDriverState **pbs,
|
|
Error **errp);
|
|
BdrvDirtyBitmap *block_dirty_bitmap_merge(const char *node, const char *target,
|
|
BlockDirtyBitmapMergeSourceList *bms,
|
|
HBitmap **backup, Error **errp);
|
|
BdrvDirtyBitmap *block_dirty_bitmap_remove(const char *node, const char *name,
|
|
bool release,
|
|
BlockDriverState **bitmap_bs,
|
|
Error **errp);
|
|
|
|
#endif /* BLOCK_INT_H */
|