d8da3cef3b
When bdrv_close_all() is called, instead of force-closing all root BlockDriverStates, it is better to just drop the reference from all BlockBackends and let them be closed automatically. This prevents BDS from getting closed that are still referenced by other BDS, which may result in loss of cached data. This patch adds a function for doing that, but does not yet incorporate it in bdrv_close_all(). Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
196 lines
9.1 KiB
C
196 lines
9.1 KiB
C
/*
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* QEMU Block backends
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*
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* Copyright (C) 2014 Red Hat, Inc.
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*
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* Authors:
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* Markus Armbruster <armbru@redhat.com>,
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1
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* or later. See the COPYING.LIB file in the top-level directory.
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*/
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#ifndef BLOCK_BACKEND_H
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#define BLOCK_BACKEND_H
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#include "qemu/typedefs.h"
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#include "qapi/error.h"
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/*
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* TODO Have to include block/block.h for a bunch of block layer
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* types. Unfortunately, this pulls in the whole BlockDriverState
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* API, which we don't want used by many BlockBackend users. Some of
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* the types belong here, and the rest should be split into a common
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* header and one for the BlockDriverState API.
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*/
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#include "block/block.h"
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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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BlockBackend *blk_new(const char *name, Error **errp);
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BlockBackend *blk_new_with_bs(const char *name, Error **errp);
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BlockBackend *blk_new_open(const char *name, const char *filename,
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const char *reference, QDict *options, int flags,
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Error **errp);
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int blk_get_refcnt(BlockBackend *blk);
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void blk_ref(BlockBackend *blk);
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void blk_unref(BlockBackend *blk);
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void blk_remove_all_bs(void);
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const char *blk_name(BlockBackend *blk);
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BlockBackend *blk_by_name(const char *name);
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BlockBackend *blk_next(BlockBackend *blk);
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BlockDriverState *blk_bs(BlockBackend *blk);
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void blk_remove_bs(BlockBackend *blk);
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void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs);
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void blk_hide_on_behalf_of_hmp_drive_del(BlockBackend *blk);
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void blk_iostatus_enable(BlockBackend *blk);
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bool blk_iostatus_is_enabled(const BlockBackend *blk);
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BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk);
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void blk_iostatus_disable(BlockBackend *blk);
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void blk_iostatus_reset(BlockBackend *blk);
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void blk_iostatus_set_err(BlockBackend *blk, int error);
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int blk_attach_dev(BlockBackend *blk, void *dev);
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void blk_attach_dev_nofail(BlockBackend *blk, void *dev);
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void blk_detach_dev(BlockBackend *blk, void *dev);
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void *blk_get_attached_dev(BlockBackend *blk);
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void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque);
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int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
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int nb_sectors);
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int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf,
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int nb_sectors);
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int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf,
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int nb_sectors);
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int blk_write_zeroes(BlockBackend *blk, int64_t sector_num,
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int nb_sectors, BdrvRequestFlags flags);
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BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, 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 blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count);
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int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count);
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int64_t blk_getlength(BlockBackend *blk);
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void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr);
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int64_t blk_nb_sectors(BlockBackend *blk);
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BlockAIOCB *blk_aio_readv(BlockBackend *blk, 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 *blk_aio_writev(BlockBackend *blk, 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 *blk_aio_flush(BlockBackend *blk,
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BlockCompletionFunc *cb, void *opaque);
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BlockAIOCB *blk_aio_discard(BlockBackend *blk,
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int64_t sector_num, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque);
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void blk_aio_cancel(BlockAIOCB *acb);
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void blk_aio_cancel_async(BlockAIOCB *acb);
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int blk_aio_multiwrite(BlockBackend *blk, BlockRequest *reqs, int num_reqs);
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int blk_ioctl(BlockBackend *blk, unsigned long int req, void *buf);
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BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
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BlockCompletionFunc *cb, void *opaque);
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int blk_co_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors);
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int blk_co_flush(BlockBackend *blk);
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int blk_flush(BlockBackend *blk);
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int blk_flush_all(void);
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void blk_drain(BlockBackend *blk);
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void blk_drain_all(void);
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void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error,
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BlockdevOnError on_write_error);
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BlockdevOnError blk_get_on_error(BlockBackend *blk, bool is_read);
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BlockErrorAction blk_get_error_action(BlockBackend *blk, bool is_read,
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int error);
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void blk_error_action(BlockBackend *blk, BlockErrorAction action,
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bool is_read, int error);
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int blk_is_read_only(BlockBackend *blk);
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int blk_is_sg(BlockBackend *blk);
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int blk_enable_write_cache(BlockBackend *blk);
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void blk_set_enable_write_cache(BlockBackend *blk, bool wce);
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void blk_invalidate_cache(BlockBackend *blk, Error **errp);
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bool blk_is_inserted(BlockBackend *blk);
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bool blk_is_available(BlockBackend *blk);
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void blk_lock_medium(BlockBackend *blk, bool locked);
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void blk_eject(BlockBackend *blk, bool eject_flag);
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int blk_get_flags(BlockBackend *blk);
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int blk_get_max_transfer_length(BlockBackend *blk);
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int blk_get_max_iov(BlockBackend *blk);
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void blk_set_guest_block_size(BlockBackend *blk, int align);
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void *blk_try_blockalign(BlockBackend *blk, size_t size);
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void *blk_blockalign(BlockBackend *blk, size_t size);
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bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp);
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void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason);
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void blk_op_block_all(BlockBackend *blk, Error *reason);
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void blk_op_unblock_all(BlockBackend *blk, Error *reason);
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AioContext *blk_get_aio_context(BlockBackend *blk);
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void blk_set_aio_context(BlockBackend *blk, AioContext *new_context);
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void blk_add_aio_context_notifier(BlockBackend *blk,
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void (*attached_aio_context)(AioContext *new_context, void *opaque),
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void (*detach_aio_context)(void *opaque), void *opaque);
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void blk_remove_aio_context_notifier(BlockBackend *blk,
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void (*attached_aio_context)(AioContext *,
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void *),
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void (*detach_aio_context)(void *),
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void *opaque);
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void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify);
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void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify);
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void blk_io_plug(BlockBackend *blk);
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void blk_io_unplug(BlockBackend *blk);
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BlockAcctStats *blk_get_stats(BlockBackend *blk);
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BlockBackendRootState *blk_get_root_state(BlockBackend *blk);
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void blk_update_root_state(BlockBackend *blk);
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void blk_apply_root_state(BlockBackend *blk, BlockDriverState *bs);
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int blk_get_open_flags_from_root_state(BlockBackend *blk);
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void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk,
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BlockCompletionFunc *cb, void *opaque);
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int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t sector_num,
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int nb_sectors, BdrvRequestFlags flags);
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int blk_write_compressed(BlockBackend *blk, int64_t sector_num,
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const uint8_t *buf, int nb_sectors);
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int blk_truncate(BlockBackend *blk, int64_t offset);
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int blk_discard(BlockBackend *blk, int64_t sector_num, int nb_sectors);
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int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
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int64_t pos, int size);
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int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size);
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int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz);
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int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo);
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BlockAIOCB *blk_abort_aio_request(BlockBackend *blk,
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BlockCompletionFunc *cb,
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void *opaque, int ret);
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#endif
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