2004-08-02 01:59:26 +04:00
|
|
|
/*
|
|
|
|
* QEMU System Emulator block driver
|
2007-09-17 01:08:06 +04:00
|
|
|
*
|
2004-08-02 01:59:26 +04:00
|
|
|
* Copyright (c) 2003 Fabrice Bellard
|
2007-09-17 01:08:06 +04:00
|
|
|
*
|
2004-08-02 01:59:26 +04:00
|
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
|
|
* in the Software without restriction, including without limitation the rights
|
|
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
|
|
* furnished to do so, subject to the following conditions:
|
|
|
|
*
|
|
|
|
* The above copyright notice and this permission notice shall be included in
|
|
|
|
* all copies or substantial portions of the Software.
|
|
|
|
*
|
|
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
|
|
* THE SOFTWARE.
|
|
|
|
*/
|
|
|
|
#ifndef BLOCK_INT_H
|
|
|
|
#define BLOCK_INT_H
|
|
|
|
|
2007-11-11 05:51:17 +03:00
|
|
|
#include "block.h"
|
2009-05-18 18:42:10 +04:00
|
|
|
#include "qemu-option.h"
|
2010-04-10 10:02:42 +04:00
|
|
|
#include "qemu-queue.h"
|
2011-07-14 19:27:13 +04:00
|
|
|
#include "qemu-coroutine.h"
|
2011-08-25 10:26:10 +04:00
|
|
|
#include "qemu-timer.h"
|
2011-09-22 00:16:47 +04:00
|
|
|
#include "qapi-types.h"
|
2012-07-27 17:52:18 +04:00
|
|
|
#include "qerror.h"
|
block: introduce block job error
The following behaviors are possible:
'report': The behavior is the same as in 1.1. An I/O error,
respectively during a read or a write, will complete the job immediately
with an error code.
'ignore': An I/O error, respectively during a read or a write, will be
ignored. For streaming, the job will complete with an error and the
backing file will be left in place. For mirroring, the sector will be
marked again as dirty and re-examined later.
'stop': The job will be paused and the job iostatus will be set to
failed or nospace, while the VM will keep running. This can only be
specified if the block device has rerror=stop and werror=stop or enospc.
'enospc': Behaves as 'stop' for ENOSPC errors, 'report' for others.
In all cases, even for 'report', the I/O error is reported as a QMP
event BLOCK_JOB_ERROR, with the same arguments as BLOCK_IO_ERROR.
It is possible that while stopping the VM a BLOCK_IO_ERROR event will be
reported and will clobber the event from BLOCK_JOB_ERROR, or vice versa.
This is not really avoidable since stopping the VM completes all pending
I/O requests. In fact, it is already possible now that a series of
BLOCK_IO_ERROR events are reported with rerror=stop, because vm_stop
calls bdrv_drain_all and this can generate further errors.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28 19:22:58 +04:00
|
|
|
#include "monitor.h"
|
2007-11-11 05:51:17 +03:00
|
|
|
|
2012-07-27 12:05:22 +04:00
|
|
|
#define BLOCK_FLAG_ENCRYPT 1
|
|
|
|
#define BLOCK_FLAG_COMPAT6 4
|
|
|
|
#define BLOCK_FLAG_LAZY_REFCOUNTS 8
|
2007-09-17 01:59:02 +04:00
|
|
|
|
2011-11-03 12:57:25 +04:00
|
|
|
#define BLOCK_IO_LIMIT_READ 0
|
|
|
|
#define BLOCK_IO_LIMIT_WRITE 1
|
|
|
|
#define BLOCK_IO_LIMIT_TOTAL 2
|
|
|
|
|
|
|
|
#define BLOCK_IO_SLICE_TIME 100000000
|
2011-11-08 09:00:14 +04:00
|
|
|
#define NANOSECONDS_PER_SECOND 1000000000.0
|
2011-11-03 12:57:25 +04:00
|
|
|
|
2012-07-27 12:05:22 +04:00
|
|
|
#define BLOCK_OPT_SIZE "size"
|
|
|
|
#define BLOCK_OPT_ENCRYPT "encryption"
|
|
|
|
#define BLOCK_OPT_COMPAT6 "compat6"
|
|
|
|
#define BLOCK_OPT_BACKING_FILE "backing_file"
|
|
|
|
#define BLOCK_OPT_BACKING_FMT "backing_fmt"
|
|
|
|
#define BLOCK_OPT_CLUSTER_SIZE "cluster_size"
|
|
|
|
#define BLOCK_OPT_TABLE_SIZE "table_size"
|
|
|
|
#define BLOCK_OPT_PREALLOC "preallocation"
|
|
|
|
#define BLOCK_OPT_SUBFMT "subformat"
|
|
|
|
#define BLOCK_OPT_COMPAT_LEVEL "compat"
|
|
|
|
#define BLOCK_OPT_LAZY_REFCOUNTS "lazy_refcounts"
|
2009-05-18 18:42:10 +04:00
|
|
|
|
2011-11-17 17:40:27 +04:00
|
|
|
typedef struct BdrvTrackedRequest BdrvTrackedRequest;
|
|
|
|
|
2011-11-03 12:57:25 +04:00
|
|
|
typedef struct BlockIOLimit {
|
|
|
|
int64_t bps[3];
|
|
|
|
int64_t iops[3];
|
|
|
|
} BlockIOLimit;
|
|
|
|
|
|
|
|
typedef struct BlockIOBaseValue {
|
|
|
|
uint64_t bytes[2];
|
|
|
|
uint64_t ios[2];
|
|
|
|
} BlockIOBaseValue;
|
|
|
|
|
2004-08-02 01:59:26 +04:00
|
|
|
struct BlockDriver {
|
|
|
|
const char *format_name;
|
|
|
|
int instance_size;
|
|
|
|
int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename);
|
2009-06-15 16:04:22 +04:00
|
|
|
int (*bdrv_probe_device)(const char *filename);
|
2012-09-20 23:13:19 +04:00
|
|
|
|
|
|
|
/* For handling image reopen for split or non-split files */
|
|
|
|
int (*bdrv_reopen_prepare)(BDRVReopenState *reopen_state,
|
|
|
|
BlockReopenQueue *queue, Error **errp);
|
|
|
|
void (*bdrv_reopen_commit)(BDRVReopenState *reopen_state);
|
|
|
|
void (*bdrv_reopen_abort)(BDRVReopenState *reopen_state);
|
|
|
|
|
2010-04-14 16:17:38 +04:00
|
|
|
int (*bdrv_open)(BlockDriverState *bs, int flags);
|
|
|
|
int (*bdrv_file_open)(BlockDriverState *bs, const char *filename, int flags);
|
2007-09-17 01:08:06 +04:00
|
|
|
int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
|
2004-08-02 01:59:26 +04:00
|
|
|
uint8_t *buf, int nb_sectors);
|
2007-09-17 01:08:06 +04:00
|
|
|
int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
|
2004-08-02 01:59:26 +04:00
|
|
|
const uint8_t *buf, int nb_sectors);
|
2004-09-18 23:32:11 +04:00
|
|
|
void (*bdrv_close)(BlockDriverState *bs);
|
2012-05-08 18:51:41 +04:00
|
|
|
void (*bdrv_rebind)(BlockDriverState *bs);
|
2009-05-18 18:42:10 +04:00
|
|
|
int (*bdrv_create)(const char *filename, QEMUOptionParameter *options);
|
2004-08-02 01:59:26 +04:00
|
|
|
int (*bdrv_set_key)(BlockDriverState *bs, const char *key);
|
2005-12-18 21:28:15 +03:00
|
|
|
int (*bdrv_make_empty)(BlockDriverState *bs);
|
2006-08-01 20:21:11 +04:00
|
|
|
/* aio */
|
2009-04-07 22:43:24 +04:00
|
|
|
BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
|
|
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
2006-08-07 06:38:06 +04:00
|
|
|
BlockDriverCompletionFunc *cb, void *opaque);
|
2009-04-07 22:43:24 +04:00
|
|
|
BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs,
|
|
|
|
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
2006-08-07 06:38:06 +04:00
|
|
|
BlockDriverCompletionFunc *cb, void *opaque);
|
2009-09-04 21:01:49 +04:00
|
|
|
BlockDriverAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs,
|
|
|
|
BlockDriverCompletionFunc *cb, void *opaque);
|
2011-10-17 14:32:14 +04:00
|
|
|
BlockDriverAIOCB *(*bdrv_aio_discard)(BlockDriverState *bs,
|
|
|
|
int64_t sector_num, int nb_sectors,
|
|
|
|
BlockDriverCompletionFunc *cb, void *opaque);
|
2006-08-01 20:21:11 +04:00
|
|
|
|
2011-07-14 19:27:13 +04:00
|
|
|
int coroutine_fn (*bdrv_co_readv)(BlockDriverState *bs,
|
|
|
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
|
|
|
|
int coroutine_fn (*bdrv_co_writev)(BlockDriverState *bs,
|
|
|
|
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
|
2012-02-07 17:27:25 +04:00
|
|
|
/*
|
|
|
|
* Efficiently zero a region of the disk image. Typically an image format
|
|
|
|
* would use a compact metadata representation to implement this. This
|
|
|
|
* function pointer may be NULL and .bdrv_co_writev() will be called
|
|
|
|
* instead.
|
|
|
|
*/
|
|
|
|
int coroutine_fn (*bdrv_co_write_zeroes)(BlockDriverState *bs,
|
|
|
|
int64_t sector_num, int nb_sectors);
|
2011-10-17 14:32:14 +04:00
|
|
|
int coroutine_fn (*bdrv_co_discard)(BlockDriverState *bs,
|
|
|
|
int64_t sector_num, int nb_sectors);
|
2011-11-14 16:44:19 +04:00
|
|
|
int coroutine_fn (*bdrv_co_is_allocated)(BlockDriverState *bs,
|
|
|
|
int64_t sector_num, int nb_sectors, int *pnum);
|
2011-07-14 19:27:13 +04:00
|
|
|
|
2011-11-15 01:09:45 +04:00
|
|
|
/*
|
|
|
|
* Invalidate any cached meta-data.
|
|
|
|
*/
|
|
|
|
void (*bdrv_invalidate_cache)(BlockDriverState *bs);
|
|
|
|
|
2011-11-10 20:25:44 +04:00
|
|
|
/*
|
|
|
|
* Flushes all data that was already written to the OS all the way down to
|
|
|
|
* the disk (for example raw-posix calls fsync()).
|
|
|
|
*/
|
|
|
|
int coroutine_fn (*bdrv_co_flush_to_disk)(BlockDriverState *bs);
|
|
|
|
|
2011-11-10 21:10:11 +04:00
|
|
|
/*
|
|
|
|
* Flushes all internal caches to the OS. The data may still sit in a
|
|
|
|
* writeback cache of the host OS, but it will survive a crash of the qemu
|
|
|
|
* process.
|
|
|
|
*/
|
|
|
|
int coroutine_fn (*bdrv_co_flush_to_os)(BlockDriverState *bs);
|
|
|
|
|
2006-08-01 20:21:11 +04:00
|
|
|
const char *protocol_name;
|
|
|
|
int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
|
|
|
|
int64_t (*bdrv_getlength)(BlockDriverState *bs);
|
2011-07-12 15:56:39 +04:00
|
|
|
int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs);
|
2007-09-17 01:08:06 +04:00
|
|
|
int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
|
2006-08-06 01:31:00 +04:00
|
|
|
const uint8_t *buf, int nb_sectors);
|
|
|
|
|
2007-09-17 01:08:06 +04:00
|
|
|
int (*bdrv_snapshot_create)(BlockDriverState *bs,
|
2006-08-06 01:31:00 +04:00
|
|
|
QEMUSnapshotInfo *sn_info);
|
2007-09-17 01:08:06 +04:00
|
|
|
int (*bdrv_snapshot_goto)(BlockDriverState *bs,
|
2006-08-06 01:31:00 +04:00
|
|
|
const char *snapshot_id);
|
|
|
|
int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
|
2007-09-17 01:08:06 +04:00
|
|
|
int (*bdrv_snapshot_list)(BlockDriverState *bs,
|
2006-08-06 01:31:00 +04:00
|
|
|
QEMUSnapshotInfo **psn_info);
|
2010-09-22 06:58:41 +04:00
|
|
|
int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs,
|
|
|
|
const char *snapshot_name);
|
2006-08-06 01:31:00 +04:00
|
|
|
int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
|
2006-08-01 20:21:11 +04:00
|
|
|
|
2009-07-11 01:11:57 +04:00
|
|
|
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);
|
2009-04-05 23:10:55 +04:00
|
|
|
|
2010-01-12 14:55:17 +03:00
|
|
|
int (*bdrv_change_backing_file)(BlockDriverState *bs,
|
|
|
|
const char *backing_file, const char *backing_fmt);
|
|
|
|
|
2006-08-19 15:45:59 +04:00
|
|
|
/* removable device specific */
|
|
|
|
int (*bdrv_is_inserted)(BlockDriverState *bs);
|
|
|
|
int (*bdrv_media_changed)(BlockDriverState *bs);
|
2012-02-03 22:24:53 +04:00
|
|
|
void (*bdrv_eject)(BlockDriverState *bs, bool eject_flag);
|
2011-09-06 20:58:47 +04:00
|
|
|
void (*bdrv_lock_medium)(BlockDriverState *bs, bool locked);
|
2007-09-17 12:09:54 +04:00
|
|
|
|
2007-12-24 19:10:43 +03:00
|
|
|
/* to control generic scsi devices */
|
|
|
|
int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
|
2009-03-28 20:28:41 +03:00
|
|
|
BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
|
|
|
|
unsigned long int req, void *buf,
|
|
|
|
BlockDriverCompletionFunc *cb, void *opaque);
|
2007-12-24 19:10:43 +03:00
|
|
|
|
2009-05-18 18:42:10 +04:00
|
|
|
/* List of options for creating images, terminated by name == NULL */
|
|
|
|
QEMUOptionParameter *create_options;
|
|
|
|
|
2009-03-28 20:55:10 +03:00
|
|
|
|
2010-06-29 14:37:54 +04:00
|
|
|
/*
|
|
|
|
* Returns 0 for completed check, -errno for internal errors.
|
|
|
|
* The check results are stored in result.
|
|
|
|
*/
|
2012-05-11 18:07:02 +04:00
|
|
|
int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result,
|
|
|
|
BdrvCheckMode fix);
|
2009-04-22 03:11:50 +04:00
|
|
|
|
2010-03-15 19:27:00 +03:00
|
|
|
void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
|
|
|
|
|
2010-07-28 13:26:29 +04:00
|
|
|
/*
|
|
|
|
* Returns 1 if newly created images are guaranteed to contain only
|
|
|
|
* zeros, 0 otherwise.
|
|
|
|
*/
|
|
|
|
int (*bdrv_has_zero_init)(BlockDriverState *bs);
|
2009-11-30 18:54:15 +03:00
|
|
|
|
2010-04-13 13:29:33 +04:00
|
|
|
QLIST_ENTRY(BlockDriver) list;
|
2004-08-02 01:59:26 +04:00
|
|
|
};
|
|
|
|
|
2012-02-29 00:54:06 +04:00
|
|
|
/*
|
|
|
|
* 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.
|
|
|
|
*/
|
2004-08-02 01:59:26 +04:00
|
|
|
struct BlockDriverState {
|
2006-08-06 17:35:09 +04:00
|
|
|
int64_t total_sectors; /* if we are reading a disk image, give its
|
|
|
|
size in sectors */
|
2004-08-02 01:59:26 +04:00
|
|
|
int read_only; /* if true, the media is read only */
|
2010-02-14 14:39:18 +03:00
|
|
|
int open_flags; /* flags used to open the file, re-used for re-open */
|
2004-08-02 01:59:26 +04:00
|
|
|
int encrypted; /* if true, the media is encrypted */
|
2009-03-06 02:01:01 +03:00
|
|
|
int valid_key; /* if true, a valid encryption key has been set */
|
2007-12-24 19:10:43 +03:00
|
|
|
int sg; /* if true, the device is a /dev/sg* */
|
2011-11-28 20:08:47 +04:00
|
|
|
int copy_on_read; /* if true, copy read backing sectors into image
|
|
|
|
note this is a reference count */
|
2004-08-02 01:59:26 +04:00
|
|
|
|
2006-08-19 15:45:59 +04:00
|
|
|
BlockDriver *drv; /* NULL means no media */
|
2004-08-02 01:59:26 +04:00
|
|
|
void *opaque;
|
|
|
|
|
2011-08-03 17:07:40 +04:00
|
|
|
void *dev; /* attached device model, if any */
|
|
|
|
/* TODO change to DeviceState when all users are qdevified */
|
2011-08-03 17:07:41 +04:00
|
|
|
const BlockDevOps *dev_ops;
|
|
|
|
void *dev_opaque;
|
2010-06-29 18:58:30 +04:00
|
|
|
|
2004-08-02 01:59:26 +04:00
|
|
|
char filename[1024];
|
|
|
|
char backing_file[1024]; /* if non zero, the image is a diff of
|
|
|
|
this file image */
|
2009-03-28 20:55:10 +03:00
|
|
|
char backing_format[16]; /* if non-zero and backing_file exists */
|
2004-08-02 01:59:26 +04:00
|
|
|
int is_temporary;
|
2006-08-19 15:45:59 +04:00
|
|
|
|
2004-08-02 01:59:26 +04:00
|
|
|
BlockDriverState *backing_hd;
|
2010-04-14 16:17:38 +04:00
|
|
|
BlockDriverState *file;
|
|
|
|
|
2012-01-18 18:40:42 +04:00
|
|
|
/* number of in-flight copy-on-read requests */
|
|
|
|
unsigned int copy_on_read_in_flight;
|
|
|
|
|
2011-11-03 12:57:25 +04:00
|
|
|
/* the time for latest disk I/O */
|
|
|
|
int64_t slice_time;
|
|
|
|
int64_t slice_start;
|
|
|
|
int64_t slice_end;
|
|
|
|
BlockIOLimit io_limits;
|
|
|
|
BlockIOBaseValue io_base;
|
|
|
|
CoQueue throttled_reqs;
|
|
|
|
QEMUTimer *block_timer;
|
|
|
|
bool io_limits_enabled;
|
|
|
|
|
2007-12-02 08:18:19 +03:00
|
|
|
/* I/O stats (display with "info blockstats"). */
|
2011-08-25 10:26:01 +04:00
|
|
|
uint64_t nr_bytes[BDRV_MAX_IOTYPE];
|
|
|
|
uint64_t nr_ops[BDRV_MAX_IOTYPE];
|
2011-08-25 10:26:10 +04:00
|
|
|
uint64_t total_time_ns[BDRV_MAX_IOTYPE];
|
2010-04-28 16:34:01 +04:00
|
|
|
uint64_t wr_highest_sector;
|
2007-12-02 08:18:19 +03:00
|
|
|
|
2009-03-03 20:37:16 +03:00
|
|
|
/* Whether the disk can expand beyond total_sectors */
|
|
|
|
int growable;
|
|
|
|
|
2009-04-23 00:20:00 +04:00
|
|
|
/* the memory alignment required for the buffers handled by this driver */
|
|
|
|
int buffer_alignment;
|
|
|
|
|
2009-09-04 21:01:15 +04:00
|
|
|
/* do we need to tell the quest if we have a volatile write cache? */
|
|
|
|
int enable_write_cache;
|
|
|
|
|
2004-08-02 01:59:26 +04:00
|
|
|
/* NOTE: the following infos are only hints for real hardware
|
|
|
|
drivers. They are not used by the block driver */
|
2012-09-28 19:22:54 +04:00
|
|
|
BlockdevOnError on_read_error, on_write_error;
|
2011-10-15 00:11:23 +04:00
|
|
|
bool iostatus_enabled;
|
2011-09-22 00:16:47 +04:00
|
|
|
BlockDeviceIoStatus iostatus;
|
2004-08-02 01:59:26 +04:00
|
|
|
char device_name[32];
|
2009-11-30 20:21:20 +03:00
|
|
|
unsigned long *dirty_bitmap;
|
2010-01-26 11:31:48 +03:00
|
|
|
int64_t dirty_count;
|
2011-01-26 17:12:34 +03:00
|
|
|
int in_use; /* users other than guest access, eg. block migration */
|
2010-04-10 10:02:42 +04:00
|
|
|
QTAILQ_ENTRY(BlockDriverState) list;
|
2011-11-17 17:40:27 +04:00
|
|
|
|
|
|
|
QLIST_HEAD(, BdrvTrackedRequest) tracked_requests;
|
2012-01-18 18:40:43 +04:00
|
|
|
|
|
|
|
/* long-running background operation */
|
|
|
|
BlockJob *job;
|
2012-09-20 23:13:19 +04:00
|
|
|
|
2004-08-02 01:59:26 +04:00
|
|
|
};
|
|
|
|
|
2012-05-28 11:27:54 +04:00
|
|
|
int get_tmp_filename(char *filename, int size);
|
2005-12-18 21:28:15 +03:00
|
|
|
|
2011-11-03 12:57:25 +04:00
|
|
|
void bdrv_set_io_limits(BlockDriverState *bs,
|
|
|
|
BlockIOLimit *io_limits);
|
|
|
|
|
2009-06-15 16:04:22 +04:00
|
|
|
#ifdef _WIN32
|
|
|
|
int is_windows_drive(const char *filename);
|
|
|
|
#endif
|
block: introduce block job error
The following behaviors are possible:
'report': The behavior is the same as in 1.1. An I/O error,
respectively during a read or a write, will complete the job immediately
with an error code.
'ignore': An I/O error, respectively during a read or a write, will be
ignored. For streaming, the job will complete with an error and the
backing file will be left in place. For mirroring, the sector will be
marked again as dirty and re-examined later.
'stop': The job will be paused and the job iostatus will be set to
failed or nospace, while the VM will keep running. This can only be
specified if the block device has rerror=stop and werror=stop or enospc.
'enospc': Behaves as 'stop' for ENOSPC errors, 'report' for others.
In all cases, even for 'report', the I/O error is reported as a QMP
event BLOCK_JOB_ERROR, with the same arguments as BLOCK_IO_ERROR.
It is possible that while stopping the VM a BLOCK_IO_ERROR event will be
reported and will clobber the event from BLOCK_JOB_ERROR, or vice versa.
This is not really avoidable since stopping the VM completes all pending
I/O requests. In fact, it is already possible now that a series of
BLOCK_IO_ERROR events are reported with rerror=stop, because vm_stop
calls bdrv_drain_all and this can generate further errors.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-09-28 19:22:58 +04:00
|
|
|
void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv,
|
|
|
|
enum MonitorEvent ev,
|
|
|
|
BlockErrorAction action, bool is_read);
|
2009-06-15 16:04:22 +04:00
|
|
|
|
2012-03-30 15:17:13 +04:00
|
|
|
/**
|
|
|
|
* stream_start:
|
|
|
|
* @bs: Block device to operate on.
|
|
|
|
* @base: Block device that will become the new base, or %NULL to
|
|
|
|
* flatten the whole backing file chain onto @bs.
|
|
|
|
* @base_id: The file name that will be written to @bs as the new
|
|
|
|
* backing file if the job completes. Ignored if @base is %NULL.
|
2012-04-25 19:51:03 +04:00
|
|
|
* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
|
2012-09-28 19:22:59 +04:00
|
|
|
* @on_error: The action to take upon error.
|
2012-03-30 15:17:13 +04:00
|
|
|
* @cb: Completion function for the job.
|
|
|
|
* @opaque: Opaque pointer value passed to @cb.
|
2012-04-25 19:51:00 +04:00
|
|
|
* @errp: Error object.
|
2012-03-30 15:17:13 +04:00
|
|
|
*
|
|
|
|
* Start a streaming operation on @bs. Clusters that are unallocated
|
|
|
|
* in @bs, but allocated in any image between @base and @bs (both
|
|
|
|
* exclusive) will be written to @bs. At the end of a successful
|
|
|
|
* streaming job, the backing file of @bs will be changed to
|
|
|
|
* @base_id in the written image and to @base in the live BlockDriverState.
|
|
|
|
*/
|
2012-04-25 19:51:00 +04:00
|
|
|
void stream_start(BlockDriverState *bs, BlockDriverState *base,
|
2012-09-28 19:22:59 +04:00
|
|
|
const char *base_id, int64_t speed, BlockdevOnError on_error,
|
2012-04-25 19:51:03 +04:00
|
|
|
BlockDriverCompletionFunc *cb,
|
2012-04-25 19:51:00 +04:00
|
|
|
void *opaque, Error **errp);
|
2012-01-18 18:40:44 +04:00
|
|
|
|
2012-09-27 21:29:13 +04:00
|
|
|
/**
|
|
|
|
* commit_start:
|
|
|
|
* @bs: Top Block device
|
|
|
|
* @base: Block device that will be written into, and become the new top
|
|
|
|
* @speed: The maximum speed, in bytes per second, or 0 for unlimited.
|
|
|
|
* @on_error: The action to take upon error.
|
|
|
|
* @cb: Completion function for the job.
|
|
|
|
* @opaque: Opaque pointer value passed to @cb.
|
|
|
|
* @errp: Error object.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
void commit_start(BlockDriverState *bs, BlockDriverState *base,
|
|
|
|
BlockDriverState *top, int64_t speed,
|
2012-09-28 19:22:55 +04:00
|
|
|
BlockdevOnError on_error, BlockDriverCompletionFunc *cb,
|
2012-09-27 21:29:13 +04:00
|
|
|
void *opaque, Error **errp);
|
|
|
|
|
2004-08-02 01:59:26 +04:00
|
|
|
#endif /* BLOCK_INT_H */
|