@samitouri / QOSamiQemu
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1 /*
2 * Persistent reservation manager abstract class
3 *
4 * Copyright (c) 2017 Red Hat, Inc.
5 *
6 * Author: Paolo Bonzini <pbonzini@redhat.com>
7 *
8 * This code is licensed under the LGPL.
9 *
10 */
11
12 #include "qemu/osdep.h"
13 #include <scsi/sg.h>
14
15 #include "qapi/error.h"
16 #include "qemu/aio.h"
17 #include "block/thread-pool.h"
18 #include "scsi/pr-manager.h"
19 #include "trace.h"
20 #include "qapi/qapi-types-block.h"
21 #include "qemu/module.h"
22 #include "qapi/qapi-commands-block.h"
23
24 #define PR_MANAGER_PATH "objects"
25
26 typedef struct PRManagerData {
27 PRManager *pr_mgr;
28 struct sg_io_hdr *hdr;
29 int fd;
30 } PRManagerData;
31
32 static int pr_manager_worker(void *opaque)
33 {
34 PRManagerData *data = opaque;
35 PRManager *pr_mgr = data->pr_mgr;
36 PRManagerClass *pr_mgr_class =
37 PR_MANAGER_GET_CLASS(pr_mgr);
38 struct sg_io_hdr *hdr = data->hdr;
39 int fd = data->fd;
40 int r;
41
42 trace_pr_manager_run(fd, hdr->cmdp[0], hdr->cmdp[1]);
43
44 /* The reference was taken in pr_manager_execute. */
45 r = pr_mgr_class->run(pr_mgr, fd, hdr);
46 object_unref(OBJECT(pr_mgr));
47 return r;
48 }
49
50
51 int coroutine_fn pr_manager_execute(PRManager *pr_mgr, AioContext *ctx, int fd,
52 struct sg_io_hdr *hdr)
53 {
54 PRManagerData data = {
55 .pr_mgr = pr_mgr,
56 .fd = fd,
57 .hdr = hdr,
58 };
59
60 trace_pr_manager_execute(fd, hdr->cmdp[0], hdr->cmdp[1]);
61
62 /* The matching object_unref is in pr_manager_worker. */
63 object_ref(OBJECT(pr_mgr));
64 return thread_pool_submit_co(pr_manager_worker, &data);
65 }
66
67 bool pr_manager_is_connected(PRManager *pr_mgr)
68 {
69 PRManagerClass *pr_mgr_class =
70 PR_MANAGER_GET_CLASS(pr_mgr);
71
72 return !pr_mgr_class->is_connected || pr_mgr_class->is_connected(pr_mgr);
73 }
74
75 static const TypeInfo pr_manager_info = {
76 .parent = TYPE_OBJECT,
77 .name = TYPE_PR_MANAGER,
78 .class_size = sizeof(PRManagerClass),
79 .abstract = true,
80 .interfaces = (const InterfaceInfo[]) {
81 { TYPE_USER_CREATABLE },
82 { }
83 }
84 };
85
86 PRManager *pr_manager_lookup(const char *id, Error **errp)
87 {
88 Object *obj;
89 PRManager *pr_mgr;
90
91 obj = object_resolve_path_component(object_get_objects_root(), id);
92 if (!obj) {
93 error_setg(errp, "No persistent reservation manager with id '%s'", id);
94 return NULL;
95 }
96
97 pr_mgr = (PRManager *)
98 object_dynamic_cast(obj,
99 TYPE_PR_MANAGER);
100 if (!pr_mgr) {
101 error_setg(errp,
102 "Object with id '%s' is not a persistent reservation manager",
103 id);
104 return NULL;
105 }
106
107 return pr_mgr;
108 }
109
110 static void
111 pr_manager_register_types(void)
112 {
113 type_register_static(&pr_manager_info);
114 }
115
116 static int query_one_pr_manager(Object *object, void *opaque)
117 {
118 PRManagerInfoList ***tail = opaque;
119 PRManagerInfo *info;
120 PRManager *pr_mgr;
121
122 pr_mgr = (PRManager *)object_dynamic_cast(object, TYPE_PR_MANAGER);
123 if (!pr_mgr) {
124 return 0;
125 }
126
127 info = g_new0(PRManagerInfo, 1);
128 info->id = g_strdup(object_get_canonical_path_component(object));
129 info->connected = pr_manager_is_connected(pr_mgr);
130 QAPI_LIST_APPEND(*tail, info);
131 return 0;
132 }
133
134 PRManagerInfoList *qmp_query_pr_managers(Error **errp)
135 {
136 PRManagerInfoList *head = NULL;
137 PRManagerInfoList **prev = &head;
138 Object *container = object_get_container(PR_MANAGER_PATH);
139
140 object_child_foreach(container, query_one_pr_manager, &prev);
141 return head;
142 }
143
144 type_init(pr_manager_register_types);