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Registering an I/O buffer is only a performance optimization hint but it is still necessary to return errors when it fails. Later patches will need to detect errors when registering buffers but an immediate advantage is that error_report() calls are no longer needed in block driver .bdrv_register_buf() functions. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 20221013185908.1297568-8-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
117 lines
5 KiB
C
117 lines
5 KiB
C
/*
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* QEMU Block backends
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*
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* Copyright (C) 2014-2016 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_GLOBAL_STATE_H
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#define BLOCK_BACKEND_GLOBAL_STATE_H
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#include "block-backend-common.h"
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/*
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* Global state (GS) API. These functions run under the BQL.
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*
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* See include/block/block-global-state.h for more information about
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* the GS API.
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*/
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BlockBackend *blk_new(AioContext *ctx, uint64_t perm, uint64_t shared_perm);
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BlockBackend *blk_new_with_bs(BlockDriverState *bs, uint64_t perm,
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uint64_t shared_perm, Error **errp);
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BlockBackend *blk_new_open(const char *filename, const char *reference,
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QDict *options, int flags, 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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BlockBackend *blk_by_name(const char *name);
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BlockBackend *blk_next(BlockBackend *blk);
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BlockBackend *blk_all_next(BlockBackend *blk);
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bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp);
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void monitor_remove_blk(BlockBackend *blk);
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BlockBackendPublic *blk_get_public(BlockBackend *blk);
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BlockBackend *blk_by_public(BlockBackendPublic *public);
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void blk_remove_bs(BlockBackend *blk);
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int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp);
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int blk_replace_bs(BlockBackend *blk, BlockDriverState *new_bs, Error **errp);
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bool bdrv_has_blk(BlockDriverState *bs);
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bool bdrv_is_root_node(BlockDriverState *bs);
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int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm,
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Error **errp);
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void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm);
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void blk_iostatus_enable(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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int blk_attach_dev(BlockBackend *blk, DeviceState *dev);
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void blk_detach_dev(BlockBackend *blk, DeviceState *dev);
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DeviceState *blk_get_attached_dev(BlockBackend *blk);
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BlockBackend *blk_by_dev(void *dev);
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BlockBackend *blk_by_qdev_id(const char *id, Error **errp);
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void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque);
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void blk_activate(BlockBackend *blk, Error **errp);
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int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags);
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void blk_aio_cancel(BlockAIOCB *acb);
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int blk_commit_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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bool blk_supports_write_perm(BlockBackend *blk);
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bool blk_is_sg(BlockBackend *blk);
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void blk_set_enable_write_cache(BlockBackend *blk, bool wce);
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int blk_get_flags(BlockBackend *blk);
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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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int blk_set_aio_context(BlockBackend *blk, AioContext *new_context,
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Error **errp);
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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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BlockBackendRootState *blk_get_root_state(BlockBackend *blk);
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void blk_update_root_state(BlockBackend *blk);
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bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk);
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int blk_get_open_flags_from_root_state(BlockBackend *blk);
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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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void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg);
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void blk_io_limits_disable(BlockBackend *blk);
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void blk_io_limits_enable(BlockBackend *blk, const char *group);
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void blk_io_limits_update_group(BlockBackend *blk, const char *group);
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void blk_set_force_allow_inactivate(BlockBackend *blk);
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bool blk_register_buf(BlockBackend *blk, void *host, size_t size, Error **errp);
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void blk_unregister_buf(BlockBackend *blk, void *host, size_t size);
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const BdrvChild *blk_root(BlockBackend *blk);
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int blk_make_empty(BlockBackend *blk, Error **errp);
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#endif /* BLOCK_BACKEND_GLOBAL_STATE_H */
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