a77fd4bb29
Using the nested aio_poll() in coroutine is a bad idea. This patch
replaces the aio_poll loop in bdrv_drain with a BH, if called in
coroutine.
For example, the bdrv_drain() in mirror.c can hang when a guest issued
request is pending on it in qemu_co_mutex_lock().
Mirror coroutine in this case has just finished a request, and the block
job is about to complete. It calls bdrv_drain() which waits for the
other coroutine to complete. The other coroutine is a scsi-disk request.
The deadlock happens when the latter is in turn pending on the former to
yield/terminate, in qemu_co_mutex_lock(). The state flow is as below
(assuming a qcow2 image):
mirror coroutine scsi-disk coroutine
-------------------------------------------------------------
do last write
qcow2:qemu_co_mutex_lock()
...
scsi disk read
tracked request begin
qcow2:qemu_co_mutex_lock.enter
qcow2:qemu_co_mutex_unlock()
bdrv_drain
while (has tracked request)
aio_poll()
In the scsi-disk coroutine, the qemu_co_mutex_lock() will never return
because the mirror coroutine is blocked in the aio_poll(blocking=true).
With this patch, the added qemu_coroutine_yield() allows the scsi-disk
coroutine to make progress as expected:
mirror coroutine scsi-disk coroutine
-------------------------------------------------------------
do last write
qcow2:qemu_co_mutex_lock()
...
scsi disk read
tracked request begin
qcow2:qemu_co_mutex_lock.enter
qcow2:qemu_co_mutex_unlock()
bdrv_drain.enter
> schedule BH
> qemu_coroutine_yield()
> qcow2:qemu_co_mutex_lock.return
> ...
tracked request end
...
(resumed from BH callback)
bdrv_drain.return
...
Reported-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-id: 1459855253-5378-2-git-send-email-famz@redhat.com
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
545 lines
23 KiB
C
545 lines
23 KiB
C
#ifndef BLOCK_H
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#define BLOCK_H
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#include "block/aio.h"
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#include "qemu/iov.h"
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#include "qemu/option.h"
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#include "qemu/coroutine.h"
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#include "block/accounting.h"
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#include "block/dirty-bitmap.h"
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#include "qapi/qmp/qobject.h"
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#include "qapi-types.h"
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#include "qemu/hbitmap.h"
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/* block.c */
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typedef struct BlockDriver BlockDriver;
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typedef struct BlockJob BlockJob;
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typedef struct BdrvChild BdrvChild;
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typedef struct BdrvChildRole BdrvChildRole;
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typedef struct BlockJobTxn BlockJobTxn;
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typedef struct BlockDriverInfo {
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/* in bytes, 0 if irrelevant */
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int cluster_size;
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/* offset at which the VM state can be saved (0 if not possible) */
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int64_t vm_state_offset;
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bool is_dirty;
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/*
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* True if unallocated blocks read back as zeroes. This is equivalent
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* to the LBPRZ flag in the SCSI logical block provisioning page.
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*/
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bool unallocated_blocks_are_zero;
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/*
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* True if the driver can optimize writing zeroes by unmapping
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* sectors. This is equivalent to the BLKDISCARDZEROES ioctl in Linux
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* with the difference that in qemu a discard is allowed to silently
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* fail. Therefore we have to use bdrv_write_zeroes with the
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* BDRV_REQ_MAY_UNMAP flag for an optimized zero write with unmapping.
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* After this call the driver has to guarantee that the contents read
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* back as zero. It is additionally required that the block device is
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* opened with BDRV_O_UNMAP flag for this to work.
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*/
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bool can_write_zeroes_with_unmap;
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/*
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* True if this block driver only supports compressed writes
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*/
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bool needs_compressed_writes;
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} BlockDriverInfo;
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typedef struct BlockFragInfo {
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uint64_t allocated_clusters;
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uint64_t total_clusters;
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uint64_t fragmented_clusters;
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uint64_t compressed_clusters;
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} BlockFragInfo;
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typedef enum {
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BDRV_REQ_COPY_ON_READ = 0x1,
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BDRV_REQ_ZERO_WRITE = 0x2,
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/* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
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* is allowed to optimize a write zeroes request by unmapping (discarding)
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* blocks if it is guaranteed that the result will read back as
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* zeroes. The flag is only passed to the driver if the block device is
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* opened with BDRV_O_UNMAP.
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*/
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BDRV_REQ_MAY_UNMAP = 0x4,
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BDRV_REQ_NO_SERIALISING = 0x8,
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BDRV_REQ_FUA = 0x10,
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} BdrvRequestFlags;
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typedef struct BlockSizes {
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uint32_t phys;
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uint32_t log;
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} BlockSizes;
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typedef struct HDGeometry {
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uint32_t heads;
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uint32_t sectors;
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uint32_t cylinders;
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} HDGeometry;
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#define BDRV_O_RDWR 0x0002
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#define BDRV_O_SNAPSHOT 0x0008 /* open the file read only and save writes in a snapshot */
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#define BDRV_O_TEMPORARY 0x0010 /* delete the file after use */
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#define BDRV_O_NOCACHE 0x0020 /* do not use the host page cache */
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#define BDRV_O_NATIVE_AIO 0x0080 /* use native AIO instead of the thread pool */
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#define BDRV_O_NO_BACKING 0x0100 /* don't open the backing file */
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#define BDRV_O_NO_FLUSH 0x0200 /* disable flushing on this disk */
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#define BDRV_O_COPY_ON_READ 0x0400 /* copy read backing sectors into image */
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#define BDRV_O_INACTIVE 0x0800 /* consistency hint for migration handoff */
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#define BDRV_O_CHECK 0x1000 /* open solely for consistency check */
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#define BDRV_O_ALLOW_RDWR 0x2000 /* allow reopen to change from r/o to r/w */
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#define BDRV_O_UNMAP 0x4000 /* execute guest UNMAP/TRIM operations */
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#define BDRV_O_PROTOCOL 0x8000 /* if no block driver is explicitly given:
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select an appropriate protocol driver,
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ignoring the format layer */
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#define BDRV_O_NO_IO 0x10000 /* don't initialize for I/O */
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#define BDRV_O_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_NO_FLUSH)
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/* Option names of options parsed by the block layer */
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#define BDRV_OPT_CACHE_WB "cache.writeback"
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#define BDRV_OPT_CACHE_DIRECT "cache.direct"
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#define BDRV_OPT_CACHE_NO_FLUSH "cache.no-flush"
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#define BDRV_SECTOR_BITS 9
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#define BDRV_SECTOR_SIZE (1ULL << BDRV_SECTOR_BITS)
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#define BDRV_SECTOR_MASK ~(BDRV_SECTOR_SIZE - 1)
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#define BDRV_REQUEST_MAX_SECTORS MIN(SIZE_MAX >> BDRV_SECTOR_BITS, \
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INT_MAX >> BDRV_SECTOR_BITS)
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/*
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* Allocation status flags
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* BDRV_BLOCK_DATA: data is read from a file returned by bdrv_get_block_status.
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* BDRV_BLOCK_ZERO: sectors read as zero
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* BDRV_BLOCK_OFFSET_VALID: sector stored as raw data in a file returned by
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* bdrv_get_block_status.
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* BDRV_BLOCK_ALLOCATED: the content of the block is determined by this
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* layer (as opposed to the backing file)
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* BDRV_BLOCK_RAW: used internally to indicate that the request
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* was answered by the raw driver and that one
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* should look in bs->file directly.
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*
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* If BDRV_BLOCK_OFFSET_VALID is set, bits 9-62 represent the offset in
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* bs->file where sector data can be read from as raw data.
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*
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* DATA == 0 && ZERO == 0 means that data is read from backing_hd if present.
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*
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* DATA ZERO OFFSET_VALID
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* t t t sectors read as zero, bs->file is zero at offset
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* t f t sectors read as valid from bs->file at offset
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* f t t sectors preallocated, read as zero, bs->file not
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* necessarily zero at offset
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* f f t sectors preallocated but read from backing_hd,
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* bs->file contains garbage at offset
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* t t f sectors preallocated, read as zero, unknown offset
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* t f f sectors read from unknown file or offset
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* f t f not allocated or unknown offset, read as zero
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* f f f not allocated or unknown offset, read from backing_hd
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*/
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#define BDRV_BLOCK_DATA 0x01
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#define BDRV_BLOCK_ZERO 0x02
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#define BDRV_BLOCK_OFFSET_VALID 0x04
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#define BDRV_BLOCK_RAW 0x08
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#define BDRV_BLOCK_ALLOCATED 0x10
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#define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK
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typedef QSIMPLEQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
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typedef struct BDRVReopenState {
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BlockDriverState *bs;
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int flags;
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QDict *options;
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QDict *explicit_options;
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void *opaque;
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} BDRVReopenState;
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/*
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* Block operation types
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*/
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typedef enum BlockOpType {
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BLOCK_OP_TYPE_BACKUP_SOURCE,
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BLOCK_OP_TYPE_BACKUP_TARGET,
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BLOCK_OP_TYPE_CHANGE,
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BLOCK_OP_TYPE_COMMIT_SOURCE,
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BLOCK_OP_TYPE_COMMIT_TARGET,
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BLOCK_OP_TYPE_DATAPLANE,
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BLOCK_OP_TYPE_DRIVE_DEL,
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BLOCK_OP_TYPE_EJECT,
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BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT,
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BLOCK_OP_TYPE_INTERNAL_SNAPSHOT,
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BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE,
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BLOCK_OP_TYPE_MIRROR_SOURCE,
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BLOCK_OP_TYPE_MIRROR_TARGET,
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BLOCK_OP_TYPE_RESIZE,
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BLOCK_OP_TYPE_STREAM,
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BLOCK_OP_TYPE_REPLACE,
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BLOCK_OP_TYPE_MAX,
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} BlockOpType;
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void bdrv_info_print(Monitor *mon, const QObject *data);
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void bdrv_info(Monitor *mon, QObject **ret_data);
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void bdrv_stats_print(Monitor *mon, const QObject *data);
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void bdrv_info_stats(Monitor *mon, QObject **ret_data);
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/* disk I/O throttling */
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void bdrv_io_limits_enable(BlockDriverState *bs, const char *group);
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void bdrv_io_limits_disable(BlockDriverState *bs);
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void bdrv_io_limits_update_group(BlockDriverState *bs, const char *group);
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void bdrv_init(void);
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void bdrv_init_with_whitelist(void);
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bool bdrv_uses_whitelist(void);
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BlockDriver *bdrv_find_protocol(const char *filename,
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bool allow_protocol_prefix,
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Error **errp);
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BlockDriver *bdrv_find_format(const char *format_name);
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int bdrv_create(BlockDriver *drv, const char* filename,
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QemuOpts *opts, Error **errp);
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int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp);
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BlockDriverState *bdrv_new_root(void);
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BlockDriverState *bdrv_new(void);
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void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
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void bdrv_replace_in_backing_chain(BlockDriverState *old,
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BlockDriverState *new);
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int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough);
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int bdrv_parse_discard_flags(const char *mode, int *flags);
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BdrvChild *bdrv_open_child(const char *filename,
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QDict *options, const char *bdref_key,
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BlockDriverState* parent,
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const BdrvChildRole *child_role,
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bool allow_none, Error **errp);
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void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd);
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int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
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const char *bdref_key, Error **errp);
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int bdrv_open(BlockDriverState **pbs, const char *filename,
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const char *reference, QDict *options, int flags, Error **errp);
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BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
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BlockDriverState *bs,
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QDict *options, int flags);
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int bdrv_reopen_multiple(BlockReopenQueue *bs_queue, Error **errp);
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int bdrv_reopen(BlockDriverState *bs, int bdrv_flags, Error **errp);
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int bdrv_reopen_prepare(BDRVReopenState *reopen_state,
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BlockReopenQueue *queue, Error **errp);
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void bdrv_reopen_commit(BDRVReopenState *reopen_state);
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void bdrv_reopen_abort(BDRVReopenState *reopen_state);
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int bdrv_read(BlockDriverState *bs, int64_t sector_num,
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uint8_t *buf, int nb_sectors);
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int bdrv_write(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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int bdrv_write_zeroes(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, BdrvRequestFlags flags);
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BlockAIOCB *bdrv_aio_write_zeroes(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, BdrvRequestFlags flags,
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BlockCompletionFunc *cb, void *opaque);
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int bdrv_make_zero(BlockDriverState *bs, BdrvRequestFlags flags);
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int bdrv_pread(BlockDriverState *bs, int64_t offset,
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void *buf, int count);
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int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
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const void *buf, int count);
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int bdrv_pwritev(BlockDriverState *bs, int64_t offset, QEMUIOVector *qiov);
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int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset,
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const void *buf, int count);
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int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, QEMUIOVector *qiov);
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int coroutine_fn bdrv_co_copy_on_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_readv_no_serialising(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
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int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, QEMUIOVector *qiov);
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/*
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* Efficiently zero a region of the disk image. Note that this is a regular
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* I/O request like read or write and should have a reasonable size. This
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* function is not suitable for zeroing the entire image in a single request
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* because it may allocate memory for the entire region.
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*/
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int coroutine_fn bdrv_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, BdrvRequestFlags flags);
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BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
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const char *backing_file);
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int bdrv_get_backing_file_depth(BlockDriverState *bs);
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void bdrv_refresh_filename(BlockDriverState *bs);
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int bdrv_truncate(BlockDriverState *bs, int64_t offset);
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int64_t bdrv_nb_sectors(BlockDriverState *bs);
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int64_t bdrv_getlength(BlockDriverState *bs);
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int64_t bdrv_get_allocated_file_size(BlockDriverState *bs);
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void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
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void bdrv_refresh_limits(BlockDriverState *bs, Error **errp);
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int bdrv_commit(BlockDriverState *bs);
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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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void bdrv_register(BlockDriver *bdrv);
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int bdrv_drop_intermediate(BlockDriverState *active, BlockDriverState *top,
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BlockDriverState *base,
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const char *backing_file_str);
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BlockDriverState *bdrv_find_overlay(BlockDriverState *active,
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BlockDriverState *bs);
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BlockDriverState *bdrv_find_base(BlockDriverState *bs);
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typedef struct BdrvCheckResult {
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int corruptions;
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int leaks;
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int check_errors;
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int corruptions_fixed;
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int leaks_fixed;
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int64_t image_end_offset;
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BlockFragInfo bfi;
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} BdrvCheckResult;
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typedef enum {
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BDRV_FIX_LEAKS = 1,
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BDRV_FIX_ERRORS = 2,
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} BdrvCheckMode;
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int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix);
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/* The units of offset and total_work_size may be chosen arbitrarily by the
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* block driver; total_work_size may change during the course of the amendment
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* operation */
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typedef void BlockDriverAmendStatusCB(BlockDriverState *bs, int64_t offset,
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int64_t total_work_size, void *opaque);
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int bdrv_amend_options(BlockDriverState *bs_new, QemuOpts *opts,
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BlockDriverAmendStatusCB *status_cb, void *cb_opaque);
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/* external snapshots */
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bool bdrv_recurse_is_first_non_filter(BlockDriverState *bs,
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BlockDriverState *candidate);
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bool bdrv_is_first_non_filter(BlockDriverState *candidate);
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/* check if a named node can be replaced when doing drive-mirror */
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BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
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const char *node_name, Error **errp);
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/* async block I/O */
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BlockAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
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QEMUIOVector *iov, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque);
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BlockAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
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QEMUIOVector *iov, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque);
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BlockAIOCB *bdrv_aio_flush(BlockDriverState *bs,
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BlockCompletionFunc *cb, void *opaque);
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BlockAIOCB *bdrv_aio_discard(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque);
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void bdrv_aio_cancel(BlockAIOCB *acb);
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void bdrv_aio_cancel_async(BlockAIOCB *acb);
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typedef struct BlockRequest {
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/* Fields to be filled by multiwrite caller */
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union {
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struct {
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int64_t sector;
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int nb_sectors;
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int flags;
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QEMUIOVector *qiov;
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};
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struct {
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int req;
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void *buf;
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};
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};
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BlockCompletionFunc *cb;
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void *opaque;
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/* Filled by multiwrite implementation */
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int error;
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} BlockRequest;
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int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs,
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int num_reqs);
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/* sg packet commands */
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int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf);
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BlockAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
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unsigned long int req, void *buf,
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BlockCompletionFunc *cb, void *opaque);
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/* Invalidate any cached metadata used by image formats */
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void bdrv_invalidate_cache(BlockDriverState *bs, Error **errp);
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void bdrv_invalidate_cache_all(Error **errp);
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int bdrv_inactivate_all(void);
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/* Ensure contents are flushed to disk. */
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int bdrv_flush(BlockDriverState *bs);
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int coroutine_fn bdrv_co_flush(BlockDriverState *bs);
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void bdrv_close_all(void);
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void bdrv_drain(BlockDriverState *bs);
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void coroutine_fn bdrv_co_drain(BlockDriverState *bs);
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void bdrv_drain_all(void);
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int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
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int bdrv_co_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors);
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int bdrv_has_zero_init_1(BlockDriverState *bs);
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int bdrv_has_zero_init(BlockDriverState *bs);
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bool bdrv_unallocated_blocks_are_zero(BlockDriverState *bs);
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bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
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int64_t bdrv_get_block_status(BlockDriverState *bs, int64_t sector_num,
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|
int nb_sectors, int *pnum,
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|
BlockDriverState **file);
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|
int64_t bdrv_get_block_status_above(BlockDriverState *bs,
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|
BlockDriverState *base,
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|
int64_t sector_num,
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|
int nb_sectors, int *pnum,
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|
BlockDriverState **file);
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|
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
|
|
int *pnum);
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|
int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
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|
int64_t sector_num, int nb_sectors, int *pnum);
|
|
|
|
int bdrv_is_read_only(BlockDriverState *bs);
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|
int bdrv_is_sg(BlockDriverState *bs);
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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_lock_medium(BlockDriverState *bs, bool locked);
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|
void bdrv_eject(BlockDriverState *bs, bool eject_flag);
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|
const char *bdrv_get_format_name(BlockDriverState *bs);
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|
BlockDriverState *bdrv_find_node(const char *node_name);
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|
BlockDeviceInfoList *bdrv_named_nodes_list(Error **errp);
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|
BlockDriverState *bdrv_lookup_bs(const char *device,
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|
const char *node_name,
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|
Error **errp);
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|
bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base);
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|
BlockDriverState *bdrv_next_node(BlockDriverState *bs);
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|
BlockDriverState *bdrv_next(BlockDriverState *bs);
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|
BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs);
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|
int bdrv_is_encrypted(BlockDriverState *bs);
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|
int bdrv_key_required(BlockDriverState *bs);
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|
int bdrv_set_key(BlockDriverState *bs, const char *key);
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|
void bdrv_add_key(BlockDriverState *bs, const char *key, Error **errp);
|
|
int bdrv_query_missing_keys(void);
|
|
void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
|
|
void *opaque);
|
|
const char *bdrv_get_node_name(const BlockDriverState *bs);
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|
const char *bdrv_get_device_name(const BlockDriverState *bs);
|
|
const char *bdrv_get_device_or_node_name(const BlockDriverState *bs);
|
|
int bdrv_get_flags(BlockDriverState *bs);
|
|
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
|
const uint8_t *buf, int nb_sectors);
|
|
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
|
|
ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
|
|
void bdrv_round_to_clusters(BlockDriverState *bs,
|
|
int64_t sector_num, int nb_sectors,
|
|
int64_t *cluster_sector_num,
|
|
int *cluster_nb_sectors);
|
|
|
|
const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
|
|
void bdrv_get_backing_filename(BlockDriverState *bs,
|
|
char *filename, int filename_size);
|
|
void bdrv_get_full_backing_filename(BlockDriverState *bs,
|
|
char *dest, size_t sz, Error **errp);
|
|
void bdrv_get_full_backing_filename_from_filename(const char *backed,
|
|
const char *backing,
|
|
char *dest, size_t sz,
|
|
Error **errp);
|
|
int bdrv_is_snapshot(BlockDriverState *bs);
|
|
|
|
int path_has_protocol(const char *path);
|
|
int path_is_absolute(const char *path);
|
|
void path_combine(char *dest, int dest_size,
|
|
const char *base_path,
|
|
const char *filename);
|
|
|
|
int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
|
|
int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
|
|
int64_t pos, int size);
|
|
|
|
int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
|
int64_t pos, int size);
|
|
|
|
void bdrv_img_create(const char *filename, const char *fmt,
|
|
const char *base_filename, const char *base_fmt,
|
|
char *options, uint64_t img_size, int flags,
|
|
Error **errp, bool quiet);
|
|
|
|
/* Returns the alignment in bytes that is required so that no bounce buffer
|
|
* is required throughout the stack */
|
|
size_t bdrv_min_mem_align(BlockDriverState *bs);
|
|
/* Returns optimal alignment in bytes for bounce buffer */
|
|
size_t bdrv_opt_mem_align(BlockDriverState *bs);
|
|
void *qemu_blockalign(BlockDriverState *bs, size_t size);
|
|
void *qemu_blockalign0(BlockDriverState *bs, size_t size);
|
|
void *qemu_try_blockalign(BlockDriverState *bs, size_t size);
|
|
void *qemu_try_blockalign0(BlockDriverState *bs, size_t size);
|
|
bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov);
|
|
|
|
void bdrv_enable_copy_on_read(BlockDriverState *bs);
|
|
void bdrv_disable_copy_on_read(BlockDriverState *bs);
|
|
|
|
void bdrv_ref(BlockDriverState *bs);
|
|
void bdrv_unref(BlockDriverState *bs);
|
|
void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child);
|
|
|
|
bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp);
|
|
void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason);
|
|
void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason);
|
|
void bdrv_op_block_all(BlockDriverState *bs, Error *reason);
|
|
void bdrv_op_unblock_all(BlockDriverState *bs, Error *reason);
|
|
bool bdrv_op_blocker_is_empty(BlockDriverState *bs);
|
|
|
|
#define BLKDBG_EVENT(child, evt) \
|
|
do { \
|
|
if (child) { \
|
|
bdrv_debug_event(child->bs, evt); \
|
|
} \
|
|
} while (0)
|
|
|
|
void bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event);
|
|
|
|
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);
|
|
|
|
/**
|
|
* bdrv_get_aio_context:
|
|
*
|
|
* Returns: the currently bound #AioContext
|
|
*/
|
|
AioContext *bdrv_get_aio_context(BlockDriverState *bs);
|
|
|
|
/**
|
|
* bdrv_set_aio_context:
|
|
*
|
|
* Changes the #AioContext used for fd handlers, timers, and BHs by this
|
|
* BlockDriverState and all its children.
|
|
*
|
|
* This function must be called with iothread lock held.
|
|
*/
|
|
void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context);
|
|
int bdrv_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz);
|
|
int bdrv_probe_geometry(BlockDriverState *bs, HDGeometry *geo);
|
|
|
|
void bdrv_io_plug(BlockDriverState *bs);
|
|
void bdrv_io_unplug(BlockDriverState *bs);
|
|
void bdrv_flush_io_queue(BlockDriverState *bs);
|
|
|
|
/**
|
|
* bdrv_drained_begin:
|
|
*
|
|
* Begin a quiesced section for exclusive access to the BDS, by disabling
|
|
* external request sources including NBD server and device model. Note that
|
|
* this doesn't block timers or coroutines from submitting more requests, which
|
|
* means block_job_pause is still necessary.
|
|
*
|
|
* This function can be recursive.
|
|
*/
|
|
void bdrv_drained_begin(BlockDriverState *bs);
|
|
|
|
/**
|
|
* bdrv_drained_end:
|
|
*
|
|
* End a quiescent section started by bdrv_drained_begin().
|
|
*/
|
|
void bdrv_drained_end(BlockDriverState *bs);
|
|
|
|
#endif
|