Paolo Bonzini | 7c9e527 | 2017-08-21 18:58:56 +0200 | [diff] [blame] | 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" |
Paolo Bonzini | 5f64089 | 2018-02-28 18:47:57 +0100 | [diff] [blame] | 20 | #include "qapi/qapi-types-block.h" |
Markus Armbruster | 0b8fa32 | 2019-05-23 16:35:07 +0200 | [diff] [blame] | 21 | #include "qemu/module.h" |
Paolo Bonzini | 5f64089 | 2018-02-28 18:47:57 +0100 | [diff] [blame] | 22 | #include "qapi/qapi-commands-block.h" |
| 23 | |
| 24 | #define PR_MANAGER_PATH "/objects" |
Paolo Bonzini | 7c9e527 | 2017-08-21 18:58:56 +0200 | [diff] [blame] | 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 | |
Paolo Bonzini | 7c9e527 | 2017-08-21 18:58:56 +0200 | [diff] [blame] | 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 | |
Kevin Wolf | 2f3a7ab | 2018-10-31 11:25:18 +0100 | [diff] [blame] | 51 | int coroutine_fn pr_manager_execute(PRManager *pr_mgr, AioContext *ctx, int fd, |
| 52 | struct sg_io_hdr *hdr) |
Paolo Bonzini | 7c9e527 | 2017-08-21 18:58:56 +0200 | [diff] [blame] | 53 | { |
Paolo Bonzini | 7c9e527 | 2017-08-21 18:58:56 +0200 | [diff] [blame] | 54 | ThreadPool *pool = aio_get_thread_pool(ctx); |
Kevin Wolf | 2f3a7ab | 2018-10-31 11:25:18 +0100 | [diff] [blame] | 55 | PRManagerData data = { |
| 56 | .pr_mgr = pr_mgr, |
| 57 | .fd = fd, |
| 58 | .hdr = hdr, |
| 59 | }; |
Paolo Bonzini | 7c9e527 | 2017-08-21 18:58:56 +0200 | [diff] [blame] | 60 | |
Kevin Wolf | 2f3a7ab | 2018-10-31 11:25:18 +0100 | [diff] [blame] | 61 | trace_pr_manager_execute(fd, hdr->cmdp[0], hdr->cmdp[1]); |
Paolo Bonzini | 7c9e527 | 2017-08-21 18:58:56 +0200 | [diff] [blame] | 62 | |
| 63 | /* The matching object_unref is in pr_manager_worker. */ |
| 64 | object_ref(OBJECT(pr_mgr)); |
Kevin Wolf | 2f3a7ab | 2018-10-31 11:25:18 +0100 | [diff] [blame] | 65 | return thread_pool_submit_co(pool, pr_manager_worker, &data); |
Paolo Bonzini | 7c9e527 | 2017-08-21 18:58:56 +0200 | [diff] [blame] | 66 | } |
| 67 | |
Paolo Bonzini | 5f64089 | 2018-02-28 18:47:57 +0100 | [diff] [blame] | 68 | bool pr_manager_is_connected(PRManager *pr_mgr) |
| 69 | { |
| 70 | PRManagerClass *pr_mgr_class = |
| 71 | PR_MANAGER_GET_CLASS(pr_mgr); |
| 72 | |
| 73 | return !pr_mgr_class->is_connected || pr_mgr_class->is_connected(pr_mgr); |
| 74 | } |
| 75 | |
Paolo Bonzini | 7c9e527 | 2017-08-21 18:58:56 +0200 | [diff] [blame] | 76 | static const TypeInfo pr_manager_info = { |
| 77 | .parent = TYPE_OBJECT, |
| 78 | .name = TYPE_PR_MANAGER, |
| 79 | .class_size = sizeof(PRManagerClass), |
| 80 | .abstract = true, |
| 81 | .interfaces = (InterfaceInfo[]) { |
| 82 | { TYPE_USER_CREATABLE }, |
| 83 | { } |
| 84 | } |
| 85 | }; |
| 86 | |
| 87 | PRManager *pr_manager_lookup(const char *id, Error **errp) |
| 88 | { |
| 89 | Object *obj; |
| 90 | PRManager *pr_mgr; |
| 91 | |
| 92 | obj = object_resolve_path_component(object_get_objects_root(), id); |
| 93 | if (!obj) { |
| 94 | error_setg(errp, "No persistent reservation manager with id '%s'", id); |
| 95 | return NULL; |
| 96 | } |
| 97 | |
| 98 | pr_mgr = (PRManager *) |
| 99 | object_dynamic_cast(obj, |
| 100 | TYPE_PR_MANAGER); |
| 101 | if (!pr_mgr) { |
| 102 | error_setg(errp, |
| 103 | "Object with id '%s' is not a persistent reservation manager", |
| 104 | id); |
| 105 | return NULL; |
| 106 | } |
| 107 | |
| 108 | return pr_mgr; |
| 109 | } |
| 110 | |
| 111 | static void |
| 112 | pr_manager_register_types(void) |
| 113 | { |
| 114 | type_register_static(&pr_manager_info); |
| 115 | } |
| 116 | |
Paolo Bonzini | 5f64089 | 2018-02-28 18:47:57 +0100 | [diff] [blame] | 117 | static int query_one_pr_manager(Object *object, void *opaque) |
| 118 | { |
| 119 | PRManagerInfoList ***prev = opaque; |
| 120 | PRManagerInfoList *elem; |
| 121 | PRManagerInfo *info; |
| 122 | PRManager *pr_mgr; |
| 123 | |
| 124 | pr_mgr = (PRManager *)object_dynamic_cast(object, TYPE_PR_MANAGER); |
| 125 | if (!pr_mgr) { |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | elem = g_new0(PRManagerInfoList, 1); |
| 130 | info = g_new0(PRManagerInfo, 1); |
| 131 | info->id = object_get_canonical_path_component(object); |
| 132 | info->connected = pr_manager_is_connected(pr_mgr); |
| 133 | elem->value = info; |
| 134 | elem->next = NULL; |
| 135 | |
| 136 | **prev = elem; |
| 137 | *prev = &elem->next; |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | PRManagerInfoList *qmp_query_pr_managers(Error **errp) |
| 142 | { |
| 143 | PRManagerInfoList *head = NULL; |
| 144 | PRManagerInfoList **prev = &head; |
| 145 | Object *container = container_get(object_get_root(), PR_MANAGER_PATH); |
| 146 | |
| 147 | object_child_foreach(container, query_one_pr_manager, &prev); |
| 148 | return head; |
| 149 | } |
Paolo Bonzini | 7c9e527 | 2017-08-21 18:58:56 +0200 | [diff] [blame] | 150 | |
| 151 | type_init(pr_manager_register_types); |