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 "block/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 | g_free(data); |
43 | trace_pr_manager_run(fd, hdr->cmdp[0], hdr->cmdp[1]); |
44 | |
45 | /* The reference was taken in pr_manager_execute. */ |
46 | r = pr_mgr_class->run(pr_mgr, fd, hdr); |
47 | object_unref(OBJECT(pr_mgr)); |
48 | return r; |
49 | } |
50 | |
51 | |
52 | int coroutine_fn pr_manager_execute(PRManager *pr_mgr, AioContext *ctx, int fd, |
53 | struct sg_io_hdr *hdr) |
54 | { |
55 | ThreadPool *pool = aio_get_thread_pool(ctx); |
56 | PRManagerData data = { |
57 | .pr_mgr = pr_mgr, |
58 | .fd = fd, |
59 | .hdr = hdr, |
60 | }; |
61 | |
62 | trace_pr_manager_execute(fd, hdr->cmdp[0], hdr->cmdp[1]); |
63 | |
64 | /* The matching object_unref is in pr_manager_worker. */ |
65 | object_ref(OBJECT(pr_mgr)); |
66 | return thread_pool_submit_co(pool, pr_manager_worker, &data); |
67 | } |
68 | |
69 | bool pr_manager_is_connected(PRManager *pr_mgr) |
70 | { |
71 | PRManagerClass *pr_mgr_class = |
72 | PR_MANAGER_GET_CLASS(pr_mgr); |
73 | |
74 | return !pr_mgr_class->is_connected || pr_mgr_class->is_connected(pr_mgr); |
75 | } |
76 | |
77 | static const TypeInfo pr_manager_info = { |
78 | .parent = TYPE_OBJECT, |
79 | .name = TYPE_PR_MANAGER, |
80 | .class_size = sizeof(PRManagerClass), |
81 | .abstract = true, |
82 | .interfaces = (InterfaceInfo[]) { |
83 | { TYPE_USER_CREATABLE }, |
84 | { } |
85 | } |
86 | }; |
87 | |
88 | PRManager *pr_manager_lookup(const char *id, Error **errp) |
89 | { |
90 | Object *obj; |
91 | PRManager *pr_mgr; |
92 | |
93 | obj = object_resolve_path_component(object_get_objects_root(), id); |
94 | if (!obj) { |
95 | error_setg(errp, "No persistent reservation manager with id '%s'" , id); |
96 | return NULL; |
97 | } |
98 | |
99 | pr_mgr = (PRManager *) |
100 | object_dynamic_cast(obj, |
101 | TYPE_PR_MANAGER); |
102 | if (!pr_mgr) { |
103 | error_setg(errp, |
104 | "Object with id '%s' is not a persistent reservation manager" , |
105 | id); |
106 | return NULL; |
107 | } |
108 | |
109 | return pr_mgr; |
110 | } |
111 | |
112 | static void |
113 | pr_manager_register_types(void) |
114 | { |
115 | type_register_static(&pr_manager_info); |
116 | } |
117 | |
118 | static int query_one_pr_manager(Object *object, void *opaque) |
119 | { |
120 | PRManagerInfoList ***prev = opaque; |
121 | PRManagerInfoList *elem; |
122 | PRManagerInfo *info; |
123 | PRManager *pr_mgr; |
124 | |
125 | pr_mgr = (PRManager *)object_dynamic_cast(object, TYPE_PR_MANAGER); |
126 | if (!pr_mgr) { |
127 | return 0; |
128 | } |
129 | |
130 | elem = g_new0(PRManagerInfoList, 1); |
131 | info = g_new0(PRManagerInfo, 1); |
132 | info->id = object_get_canonical_path_component(object); |
133 | info->connected = pr_manager_is_connected(pr_mgr); |
134 | elem->value = info; |
135 | elem->next = NULL; |
136 | |
137 | **prev = elem; |
138 | *prev = &elem->next; |
139 | return 0; |
140 | } |
141 | |
142 | PRManagerInfoList *qmp_query_pr_managers(Error **errp) |
143 | { |
144 | PRManagerInfoList *head = NULL; |
145 | PRManagerInfoList **prev = &head; |
146 | Object *container = container_get(object_get_root(), PR_MANAGER_PATH); |
147 | |
148 | object_child_foreach(container, query_one_pr_manager, &prev); |
149 | return head; |
150 | } |
151 | |
152 | type_init(pr_manager_register_types); |
153 | |