155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
/*
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* Persistent reservation manager abstract class
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*
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* Copyright (c) 2017 Red Hat, Inc.
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*
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* Author: Paolo Bonzini <pbonzini@redhat.com>
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*
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* This code is licensed under the LGPL.
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*
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*/
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#include "qemu/osdep.h"
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#include <scsi/sg.h>
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#include "qapi/error.h"
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#include "block/aio.h"
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#include "block/thread-pool.h"
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#include "scsi/pr-manager.h"
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#include "trace.h"
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#include "qapi/qapi-types-block.h"
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#include "qapi/qapi-commands-block.h"
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#define PR_MANAGER_PATH "/objects"
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typedef struct PRManagerData {
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PRManager *pr_mgr;
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struct sg_io_hdr *hdr;
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int fd;
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} PRManagerData;
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static int pr_manager_worker(void *opaque)
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{
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PRManagerData *data = opaque;
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PRManager *pr_mgr = data->pr_mgr;
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PRManagerClass *pr_mgr_class =
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PR_MANAGER_GET_CLASS(pr_mgr);
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struct sg_io_hdr *hdr = data->hdr;
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int fd = data->fd;
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int r;
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g_free(data);
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trace_pr_manager_run(fd, hdr->cmdp[0], hdr->cmdp[1]);
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/* The reference was taken in pr_manager_execute. */
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r = pr_mgr_class->run(pr_mgr, fd, hdr);
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object_unref(OBJECT(pr_mgr));
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return r;
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}
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BlockAIOCB *pr_manager_execute(PRManager *pr_mgr,
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AioContext *ctx, int fd,
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struct sg_io_hdr *hdr,
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BlockCompletionFunc *complete,
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void *opaque)
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{
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PRManagerData *data = g_new(PRManagerData, 1);
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ThreadPool *pool = aio_get_thread_pool(ctx);
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trace_pr_manager_execute(fd, hdr->cmdp[0], hdr->cmdp[1], opaque);
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data->pr_mgr = pr_mgr;
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data->fd = fd;
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data->hdr = hdr;
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/* The matching object_unref is in pr_manager_worker. */
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object_ref(OBJECT(pr_mgr));
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return thread_pool_submit_aio(pool, pr_manager_worker,
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data, complete, opaque);
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}
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bool pr_manager_is_connected(PRManager *pr_mgr)
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{
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PRManagerClass *pr_mgr_class =
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PR_MANAGER_GET_CLASS(pr_mgr);
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return !pr_mgr_class->is_connected || pr_mgr_class->is_connected(pr_mgr);
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}
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static const TypeInfo pr_manager_info = {
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.parent = TYPE_OBJECT,
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.name = TYPE_PR_MANAGER,
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.class_size = sizeof(PRManagerClass),
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.abstract = true,
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.interfaces = (InterfaceInfo[]) {
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{ TYPE_USER_CREATABLE },
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{ }
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}
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};
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PRManager *pr_manager_lookup(const char *id, Error **errp)
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{
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Object *obj;
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PRManager *pr_mgr;
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obj = object_resolve_path_component(object_get_objects_root(), id);
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if (!obj) {
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error_setg(errp, "No persistent reservation manager with id '%s'", id);
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return NULL;
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}
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pr_mgr = (PRManager *)
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object_dynamic_cast(obj,
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TYPE_PR_MANAGER);
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if (!pr_mgr) {
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error_setg(errp,
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"Object with id '%s' is not a persistent reservation manager",
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id);
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return NULL;
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}
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return pr_mgr;
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}
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static void
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pr_manager_register_types(void)
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{
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type_register_static(&pr_manager_info);
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}
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static int query_one_pr_manager(Object *object, void *opaque)
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{
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PRManagerInfoList ***prev = opaque;
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PRManagerInfoList *elem;
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PRManagerInfo *info;
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PRManager *pr_mgr;
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pr_mgr = (PRManager *)object_dynamic_cast(object, TYPE_PR_MANAGER);
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if (!pr_mgr) {
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return 0;
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}
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elem = g_new0(PRManagerInfoList, 1);
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info = g_new0(PRManagerInfo, 1);
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info->id = object_get_canonical_path_component(object);
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info->connected = pr_manager_is_connected(pr_mgr);
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elem->value = info;
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elem->next = NULL;
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**prev = elem;
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*prev = &elem->next;
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return 0;
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}
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PRManagerInfoList *qmp_query_pr_managers(Error **errp)
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{
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PRManagerInfoList *head = NULL;
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PRManagerInfoList **prev = &head;
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Object *container = container_get(object_get_root(), PR_MANAGER_PATH);
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object_child_foreach(container, query_one_pr_manager, &prev);
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return head;
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}
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type_init(pr_manager_register_types);
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