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We'll need an id to identify block exports in monitor commands. This adds one. Note that this is different from the 'name' option in the NBD server, which is the externally visible export name. While block export ids need to be unique in the whole process, export names must be unique only for the same server. Different export types or (potentially in the future) multiple NBD servers can have the same export name externally, but still need different block export ids internally. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200924152717.287415-19-kwolf@redhat.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
77 lines
2 KiB
C
77 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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/* Unique identifier for the export */
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char *id;
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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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