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e971aa1273
This is based on Supriya Kannery's bdrv_reopen() patch series.
This provides a transactional method to reopen multiple
images files safely.
Image files are queue for reopen via bdrv_reopen_queue(), and the
reopen occurs when bdrv_reopen_multiple() is called. Changes are
staged in bdrv_reopen_prepare() and in the equivalent driver level
functions. If any of the staged images fails a prepare, then all
of the images left untouched, and the staged changes for each image
abandoned.
Block drivers are passed a reopen state structure, that contains:
* BDS to reopen
* flags for the reopen
* opaque pointer for any driver-specific data that needs to be
persistent from _prepare to _commit/_abort
* reopen queue pointer, if the driver needs to queue additional
BDS for a reopen
Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
427 lines
16 KiB
C
427 lines
16 KiB
C
#ifndef BLOCK_H
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#define BLOCK_H
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#include "qemu-aio.h"
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#include "qemu-common.h"
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#include "qemu-option.h"
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#include "qemu-coroutine.h"
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#include "qobject.h"
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/* block.c */
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typedef struct BlockDriver BlockDriver;
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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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} 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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} BlockFragInfo;
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typedef struct QEMUSnapshotInfo {
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char id_str[128]; /* unique snapshot id */
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/* the following fields are informative. They are not needed for
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the consistency of the snapshot */
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char name[256]; /* user chosen name */
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uint64_t vm_state_size; /* VM state info size */
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uint32_t date_sec; /* UTC date of the snapshot */
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uint32_t date_nsec;
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uint64_t vm_clock_nsec; /* VM clock relative to boot */
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} QEMUSnapshotInfo;
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/* Callbacks for block device models */
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typedef struct BlockDevOps {
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/*
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* Runs when virtual media changed (monitor commands eject, change)
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* Argument load is true on load and false on eject.
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* Beware: doesn't run when a host device's physical media
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* changes. Sure would be useful if it did.
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* Device models with removable media must implement this callback.
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*/
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void (*change_media_cb)(void *opaque, bool load);
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/*
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* Runs when an eject request is issued from the monitor, the tray
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* is closed, and the medium is locked.
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* Device models that do not implement is_medium_locked will not need
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* this callback. Device models that can lock the medium or tray might
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* want to implement the callback and unlock the tray when "force" is
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* true, even if they do not support eject requests.
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*/
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void (*eject_request_cb)(void *opaque, bool force);
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/*
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* Is the virtual tray open?
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* Device models implement this only when the device has a tray.
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*/
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bool (*is_tray_open)(void *opaque);
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/*
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* Is the virtual medium locked into the device?
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* Device models implement this only when device has such a lock.
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*/
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bool (*is_medium_locked)(void *opaque);
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/*
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* Runs when the size changed (e.g. monitor command block_resize)
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*/
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void (*resize_cb)(void *opaque);
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} BlockDevOps;
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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_NOCACHE 0x0020 /* do not use the host page cache */
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#define BDRV_O_CACHE_WB 0x0040 /* use write-back caching */
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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_INCOMING 0x0800 /* consistency hint for incoming migration */
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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_CACHE_MASK (BDRV_O_NOCACHE | BDRV_O_CACHE_WB | BDRV_O_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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typedef enum {
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BLOCK_ERR_REPORT, BLOCK_ERR_IGNORE, BLOCK_ERR_STOP_ENOSPC,
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BLOCK_ERR_STOP_ANY
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} BlockErrorAction;
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typedef enum {
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BDRV_ACTION_REPORT, BDRV_ACTION_IGNORE, BDRV_ACTION_STOP
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} BlockQMPEventAction;
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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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void *opaque;
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} BDRVReopenState;
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void bdrv_iostatus_enable(BlockDriverState *bs);
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void bdrv_iostatus_reset(BlockDriverState *bs);
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void bdrv_iostatus_disable(BlockDriverState *bs);
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bool bdrv_iostatus_is_enabled(const BlockDriverState *bs);
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void bdrv_iostatus_set_err(BlockDriverState *bs, int error);
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void bdrv_emit_qmp_error_event(const BlockDriverState *bdrv,
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BlockQMPEventAction action, int is_read);
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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);
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void bdrv_io_limits_disable(BlockDriverState *bs);
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bool bdrv_io_limits_enabled(BlockDriverState *bs);
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void bdrv_init(void);
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void bdrv_init_with_whitelist(void);
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BlockDriver *bdrv_find_protocol(const char *filename);
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BlockDriver *bdrv_find_format(const char *format_name);
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BlockDriver *bdrv_find_whitelisted_format(const char *format_name);
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int bdrv_create(BlockDriver *drv, const char* filename,
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QEMUOptionParameter *options);
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int bdrv_create_file(const char* filename, QEMUOptionParameter *options);
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BlockDriverState *bdrv_new(const char *device_name);
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void bdrv_make_anon(BlockDriverState *bs);
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void bdrv_swap(BlockDriverState *bs_new, BlockDriverState *bs_old);
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void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
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void bdrv_delete(BlockDriverState *bs);
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int bdrv_parse_cache_flags(const char *mode, int *flags);
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int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags);
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int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
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BlockDriver *drv);
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BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
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BlockDriverState *bs, 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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void bdrv_close(BlockDriverState *bs);
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int bdrv_attach_dev(BlockDriverState *bs, void *dev);
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void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev);
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void bdrv_detach_dev(BlockDriverState *bs, void *dev);
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void *bdrv_get_attached_dev(BlockDriverState *bs);
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void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops,
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void *opaque);
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void bdrv_dev_eject_request(BlockDriverState *bs, bool force);
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bool bdrv_dev_has_removable_media(BlockDriverState *bs);
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bool bdrv_dev_is_tray_open(BlockDriverState *bs);
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bool bdrv_dev_is_medium_locked(BlockDriverState *bs);
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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_read_unthrottled(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_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_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_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);
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int coroutine_fn bdrv_co_is_allocated(BlockDriverState *bs, int64_t sector_num,
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int nb_sectors, int *pnum);
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int coroutine_fn bdrv_co_is_allocated_above(BlockDriverState *top,
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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 *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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int bdrv_truncate(BlockDriverState *bs, int64_t offset);
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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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int bdrv_commit(BlockDriverState *bs);
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int bdrv_commit_all(void);
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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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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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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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/* async block I/O */
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typedef void BlockDriverDirtyHandler(BlockDriverState *bs, int64_t sector,
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int sector_num);
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BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
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QEMUIOVector *iov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
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QEMUIOVector *iov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
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BlockDriverCompletionFunc *cb, void *opaque);
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BlockDriverAIOCB *bdrv_aio_discard(BlockDriverState *bs,
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int64_t sector_num, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque);
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void bdrv_aio_cancel(BlockDriverAIOCB *acb);
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typedef struct BlockRequest {
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/* Fields to be filled by multiwrite caller */
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int64_t sector;
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int nb_sectors;
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QEMUIOVector *qiov;
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BlockDriverCompletionFunc *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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BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
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unsigned long int req, void *buf,
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BlockDriverCompletionFunc *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);
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void bdrv_invalidate_cache_all(void);
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void bdrv_clear_incoming_migration_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_flush_all(void);
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void bdrv_close_all(void);
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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(BlockDriverState *bs);
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int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
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int *pnum);
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void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
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BlockErrorAction on_write_error);
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BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read);
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int bdrv_is_read_only(BlockDriverState *bs);
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int bdrv_is_sg(BlockDriverState *bs);
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int bdrv_enable_write_cache(BlockDriverState *bs);
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void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
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int bdrv_is_inserted(BlockDriverState *bs);
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int bdrv_media_changed(BlockDriverState *bs);
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void bdrv_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(const char *name);
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BlockDriverState *bdrv_next(BlockDriverState *bs);
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void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs),
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void *opaque);
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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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int bdrv_query_missing_keys(void);
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void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
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void *opaque);
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const char *bdrv_get_device_name(BlockDriverState *bs);
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int bdrv_get_flags(BlockDriverState *bs);
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int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
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const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
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void bdrv_get_backing_filename(BlockDriverState *bs,
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char *filename, int filename_size);
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void bdrv_get_full_backing_filename(BlockDriverState *bs,
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char *dest, size_t sz);
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int bdrv_can_snapshot(BlockDriverState *bs);
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int bdrv_is_snapshot(BlockDriverState *bs);
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BlockDriverState *bdrv_snapshots(void);
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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, const char *snapshot_id);
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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_name);
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char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);
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char *get_human_readable_size(char *buf, int buf_size, int64_t size);
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int path_is_absolute(const char *path);
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void path_combine(char *dest, int dest_size,
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const char *base_path,
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const char *filename);
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int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
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int64_t pos, int size);
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int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
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int64_t pos, int size);
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int bdrv_img_create(const char *filename, const char *fmt,
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const char *base_filename, const char *base_fmt,
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char *options, uint64_t img_size, int flags);
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void bdrv_set_buffer_alignment(BlockDriverState *bs, int align);
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void *qemu_blockalign(BlockDriverState *bs, size_t size);
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#define BDRV_SECTORS_PER_DIRTY_CHUNK 2048
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void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable);
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int bdrv_get_dirty(BlockDriverState *bs, int64_t sector);
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void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
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int nr_sectors);
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int64_t bdrv_get_dirty_count(BlockDriverState *bs);
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void bdrv_enable_copy_on_read(BlockDriverState *bs);
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void bdrv_disable_copy_on_read(BlockDriverState *bs);
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void bdrv_set_in_use(BlockDriverState *bs, int in_use);
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int bdrv_in_use(BlockDriverState *bs);
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enum BlockAcctType {
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BDRV_ACCT_READ,
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BDRV_ACCT_WRITE,
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BDRV_ACCT_FLUSH,
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BDRV_MAX_IOTYPE,
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};
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typedef struct BlockAcctCookie {
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int64_t bytes;
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int64_t start_time_ns;
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enum BlockAcctType type;
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} BlockAcctCookie;
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void bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,
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int64_t bytes, enum BlockAcctType type);
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void bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie);
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typedef enum {
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BLKDBG_L1_UPDATE,
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BLKDBG_L1_GROW_ALLOC_TABLE,
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BLKDBG_L1_GROW_WRITE_TABLE,
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BLKDBG_L1_GROW_ACTIVATE_TABLE,
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BLKDBG_L2_LOAD,
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BLKDBG_L2_UPDATE,
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BLKDBG_L2_UPDATE_COMPRESSED,
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BLKDBG_L2_ALLOC_COW_READ,
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BLKDBG_L2_ALLOC_WRITE,
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BLKDBG_READ_AIO,
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BLKDBG_READ_BACKING_AIO,
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BLKDBG_READ_COMPRESSED,
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BLKDBG_WRITE_AIO,
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BLKDBG_WRITE_COMPRESSED,
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BLKDBG_VMSTATE_LOAD,
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BLKDBG_VMSTATE_SAVE,
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BLKDBG_COW_READ,
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BLKDBG_COW_WRITE,
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BLKDBG_REFTABLE_LOAD,
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BLKDBG_REFTABLE_GROW,
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BLKDBG_REFBLOCK_LOAD,
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BLKDBG_REFBLOCK_UPDATE,
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BLKDBG_REFBLOCK_UPDATE_PART,
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BLKDBG_REFBLOCK_ALLOC,
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|
BLKDBG_REFBLOCK_ALLOC_HOOKUP,
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|
BLKDBG_REFBLOCK_ALLOC_WRITE,
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|
BLKDBG_REFBLOCK_ALLOC_WRITE_BLOCKS,
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|
BLKDBG_REFBLOCK_ALLOC_WRITE_TABLE,
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BLKDBG_REFBLOCK_ALLOC_SWITCH_TABLE,
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|
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|
BLKDBG_CLUSTER_ALLOC,
|
|
BLKDBG_CLUSTER_ALLOC_BYTES,
|
|
BLKDBG_CLUSTER_FREE,
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|
|
|
BLKDBG_EVENT_MAX,
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|
} BlkDebugEvent;
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#define BLKDBG_EVENT(bs, evt) bdrv_debug_event(bs, evt)
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void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event);
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#endif
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