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bc4ee65b8c
This adds a function to shut down all block exports, and another one to shut down the block exports of a single type. The latter is used for now when stopping the NBD server. As soon as we implement support for multiple NBD servers, we'll need a per-server list of exports and it will be replaced by a function using that. As a side effect, the BlockExport layer has a list tracking all existing exports now. closed_exports loses its only user and can go away. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200924152717.287415-18-kwolf@redhat.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
74 lines
2 KiB
C
74 lines
2 KiB
C
/*
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* Declarations for block exports
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*
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* Copyright (c) 2012, 2020 Red Hat, Inc.
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*
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* Authors:
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* Paolo Bonzini <pbonzini@redhat.com>
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* Kevin Wolf <kwolf@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*/
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#ifndef BLOCK_EXPORT_H
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#define BLOCK_EXPORT_H
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#include "qapi/qapi-types-block-export.h"
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#include "qemu/queue.h"
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typedef struct BlockExport BlockExport;
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typedef struct BlockExportDriver {
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/* The export type that this driver services */
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BlockExportType type;
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/*
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* The size of the driver-specific state that contains BlockExport as its
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* first field.
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*/
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size_t instance_size;
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/* Creates and starts a new block export */
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int (*create)(BlockExport *, BlockExportOptions *, Error **);
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/*
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* Frees a removed block export. This function is only called after all
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* references have been dropped.
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*/
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void (*delete)(BlockExport *);
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/*
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* Start to disconnect all clients and drop other references held
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* internally by the export driver. When the function returns, there may
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* still be active references while the export is in the process of
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* shutting down.
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*/
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void (*request_shutdown)(BlockExport *);
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} BlockExportDriver;
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struct BlockExport {
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const BlockExportDriver *drv;
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/*
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* Reference count for this block export. This includes strong references
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* both from the owner (qemu-nbd or the monitor) and clients connected to
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* the export.
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*/
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int refcount;
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/* The AioContext whose lock protects this BlockExport object. */
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AioContext *ctx;
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/* List entry for block_exports */
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QLIST_ENTRY(BlockExport) next;
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};
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BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp);
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void blk_exp_ref(BlockExport *exp);
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void blk_exp_unref(BlockExport *exp);
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void blk_exp_request_shutdown(BlockExport *exp);
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void blk_exp_close_all(void);
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void blk_exp_close_all_type(BlockExportType type);
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#endif
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