1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/*
* Persistent reservation manager abstract class
*
* Copyright (c) 2017 Red Hat, Inc.
*
* Author: Paolo Bonzini <pbonzini@redhat.com>
*
* This code is licensed under the LGPL.
*
*/
#include "qemu/osdep.h"
#include <scsi/sg.h>
#include "qapi/error.h"
#include "block/aio.h"
#include "block/thread-pool.h"
#include "scsi/pr-manager.h"
#include "trace.h"
#include "qapi/qapi-types-block.h"
#include "qemu/module.h"
#include "qapi/qapi-commands-block.h"
#define PR_MANAGER_PATH "/objects"
typedef struct PRManagerData {
PRManager *pr_mgr;
struct sg_io_hdr *hdr;
int fd;
} PRManagerData;
static int pr_manager_worker(void *opaque)
{
PRManagerData *data = opaque;
PRManager *pr_mgr = data->pr_mgr;
PRManagerClass *pr_mgr_class =
PR_MANAGER_GET_CLASS(pr_mgr);
struct sg_io_hdr *hdr = data->hdr;
int fd = data->fd;
int r;
g_free(data);
trace_pr_manager_run(fd, hdr->cmdp[0], hdr->cmdp[1]);
/* The reference was taken in pr_manager_execute. */
r = pr_mgr_class->run(pr_mgr, fd, hdr);
object_unref(OBJECT(pr_mgr));
return r;
}
int coroutine_fn pr_manager_execute(PRManager *pr_mgr, AioContext *ctx, int fd,
struct sg_io_hdr *hdr)
{
ThreadPool *pool = aio_get_thread_pool(ctx);
PRManagerData data = {
.pr_mgr = pr_mgr,
.fd = fd,
.hdr = hdr,
};
trace_pr_manager_execute(fd, hdr->cmdp[0], hdr->cmdp[1]);
/* The matching object_unref is in pr_manager_worker. */
object_ref(OBJECT(pr_mgr));
return thread_pool_submit_co(pool, pr_manager_worker, &data);
}
bool pr_manager_is_connected(PRManager *pr_mgr)
{
PRManagerClass *pr_mgr_class =
PR_MANAGER_GET_CLASS(pr_mgr);
return !pr_mgr_class->is_connected || pr_mgr_class->is_connected(pr_mgr);
}
static const TypeInfo pr_manager_info = {
.parent = TYPE_OBJECT,
.name = TYPE_PR_MANAGER,
.class_size = sizeof(PRManagerClass),
.abstract = true,
.interfaces = (InterfaceInfo[]) {
{ TYPE_USER_CREATABLE },
{ }
}
};
PRManager *pr_manager_lookup(const char *id, Error **errp)
{
Object *obj;
PRManager *pr_mgr;
obj = object_resolve_path_component(object_get_objects_root(), id);
if (!obj) {
error_setg(errp, "No persistent reservation manager with id '%s'", id);
return NULL;
}
pr_mgr = (PRManager *)
object_dynamic_cast(obj,
TYPE_PR_MANAGER);
if (!pr_mgr) {
error_setg(errp,
"Object with id '%s' is not a persistent reservation manager",
id);
return NULL;
}
return pr_mgr;
}
static void
pr_manager_register_types(void)
{
type_register_static(&pr_manager_info);
}
static int query_one_pr_manager(Object *object, void *opaque)
{
PRManagerInfoList ***prev = opaque;
PRManagerInfoList *elem;
PRManagerInfo *info;
PRManager *pr_mgr;
pr_mgr = (PRManager *)object_dynamic_cast(object, TYPE_PR_MANAGER);
if (!pr_mgr) {
return 0;
}
elem = g_new0(PRManagerInfoList, 1);
info = g_new0(PRManagerInfo, 1);
info->id = object_get_canonical_path_component(object);
info->connected = pr_manager_is_connected(pr_mgr);
elem->value = info;
elem->next = NULL;
**prev = elem;
*prev = &elem->next;
return 0;
}
PRManagerInfoList *qmp_query_pr_managers(Error **errp)
{
PRManagerInfoList *head = NULL;
PRManagerInfoList **prev = &head;
Object *container = container_get(object_get_root(), PR_MANAGER_PATH);
object_child_foreach(container, query_one_pr_manager, &prev);
return head;
}
type_init(pr_manager_register_types);
|
