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f66241cb DF |
1 | #include <linux/ceph/ceph_debug.h> |
2 | ||
3 | #include <linux/types.h> | |
4 | #include <linux/slab.h> | |
5 | ||
6 | #include <linux/ceph/cls_lock_client.h> | |
7 | #include <linux/ceph/decode.h> | |
8 | ||
9 | /** | |
10 | * ceph_cls_lock - grab rados lock for object | |
11 | * @oid, @oloc: object to lock | |
12 | * @lock_name: the name of the lock | |
13 | * @type: lock type (CEPH_CLS_LOCK_EXCLUSIVE or CEPH_CLS_LOCK_SHARED) | |
14 | * @cookie: user-defined identifier for this instance of the lock | |
15 | * @tag: user-defined tag | |
16 | * @desc: user-defined lock description | |
17 | * @flags: lock flags | |
18 | * | |
19 | * All operations on the same lock should use the same tag. | |
20 | */ | |
21 | int ceph_cls_lock(struct ceph_osd_client *osdc, | |
22 | struct ceph_object_id *oid, | |
23 | struct ceph_object_locator *oloc, | |
24 | char *lock_name, u8 type, char *cookie, | |
25 | char *tag, char *desc, u8 flags) | |
26 | { | |
27 | int lock_op_buf_size; | |
28 | int name_len = strlen(lock_name); | |
29 | int cookie_len = strlen(cookie); | |
30 | int tag_len = strlen(tag); | |
31 | int desc_len = strlen(desc); | |
32 | void *p, *end; | |
33 | struct page *lock_op_page; | |
34 | struct timespec mtime; | |
35 | int ret; | |
36 | ||
37 | lock_op_buf_size = name_len + sizeof(__le32) + | |
38 | cookie_len + sizeof(__le32) + | |
39 | tag_len + sizeof(__le32) + | |
40 | desc_len + sizeof(__le32) + | |
41 | sizeof(struct ceph_timespec) + | |
42 | /* flag and type */ | |
43 | sizeof(u8) + sizeof(u8) + | |
44 | CEPH_ENCODING_START_BLK_LEN; | |
45 | if (lock_op_buf_size > PAGE_SIZE) | |
46 | return -E2BIG; | |
47 | ||
48 | lock_op_page = alloc_page(GFP_NOIO); | |
49 | if (!lock_op_page) | |
50 | return -ENOMEM; | |
51 | ||
52 | p = page_address(lock_op_page); | |
53 | end = p + lock_op_buf_size; | |
54 | ||
55 | /* encode cls_lock_lock_op struct */ | |
56 | ceph_start_encoding(&p, 1, 1, | |
57 | lock_op_buf_size - CEPH_ENCODING_START_BLK_LEN); | |
58 | ceph_encode_string(&p, end, lock_name, name_len); | |
59 | ceph_encode_8(&p, type); | |
60 | ceph_encode_string(&p, end, cookie, cookie_len); | |
61 | ceph_encode_string(&p, end, tag, tag_len); | |
62 | ceph_encode_string(&p, end, desc, desc_len); | |
63 | /* only support infinite duration */ | |
64 | memset(&mtime, 0, sizeof(mtime)); | |
65 | ceph_encode_timespec(p, &mtime); | |
66 | p += sizeof(struct ceph_timespec); | |
67 | ceph_encode_8(&p, flags); | |
68 | ||
69 | dout("%s lock_name %s type %d cookie %s tag %s desc %s flags 0x%x\n", | |
70 | __func__, lock_name, type, cookie, tag, desc, flags); | |
71 | ret = ceph_osdc_call(osdc, oid, oloc, "lock", "lock", | |
72 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
73 | lock_op_page, lock_op_buf_size, NULL, NULL); | |
74 | ||
75 | dout("%s: status %d\n", __func__, ret); | |
76 | __free_page(lock_op_page); | |
77 | return ret; | |
78 | } | |
79 | EXPORT_SYMBOL(ceph_cls_lock); | |
80 | ||
81 | /** | |
82 | * ceph_cls_unlock - release rados lock for object | |
83 | * @oid, @oloc: object to lock | |
84 | * @lock_name: the name of the lock | |
85 | * @cookie: user-defined identifier for this instance of the lock | |
86 | */ | |
87 | int ceph_cls_unlock(struct ceph_osd_client *osdc, | |
88 | struct ceph_object_id *oid, | |
89 | struct ceph_object_locator *oloc, | |
90 | char *lock_name, char *cookie) | |
91 | { | |
92 | int unlock_op_buf_size; | |
93 | int name_len = strlen(lock_name); | |
94 | int cookie_len = strlen(cookie); | |
95 | void *p, *end; | |
96 | struct page *unlock_op_page; | |
97 | int ret; | |
98 | ||
99 | unlock_op_buf_size = name_len + sizeof(__le32) + | |
100 | cookie_len + sizeof(__le32) + | |
101 | CEPH_ENCODING_START_BLK_LEN; | |
102 | if (unlock_op_buf_size > PAGE_SIZE) | |
103 | return -E2BIG; | |
104 | ||
105 | unlock_op_page = alloc_page(GFP_NOIO); | |
106 | if (!unlock_op_page) | |
107 | return -ENOMEM; | |
108 | ||
109 | p = page_address(unlock_op_page); | |
110 | end = p + unlock_op_buf_size; | |
111 | ||
112 | /* encode cls_lock_unlock_op struct */ | |
113 | ceph_start_encoding(&p, 1, 1, | |
114 | unlock_op_buf_size - CEPH_ENCODING_START_BLK_LEN); | |
115 | ceph_encode_string(&p, end, lock_name, name_len); | |
116 | ceph_encode_string(&p, end, cookie, cookie_len); | |
117 | ||
118 | dout("%s lock_name %s cookie %s\n", __func__, lock_name, cookie); | |
119 | ret = ceph_osdc_call(osdc, oid, oloc, "lock", "unlock", | |
120 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
121 | unlock_op_page, unlock_op_buf_size, NULL, NULL); | |
122 | ||
123 | dout("%s: status %d\n", __func__, ret); | |
124 | __free_page(unlock_op_page); | |
125 | return ret; | |
126 | } | |
127 | EXPORT_SYMBOL(ceph_cls_unlock); | |
128 | ||
129 | /** | |
130 | * ceph_cls_break_lock - release rados lock for object for specified client | |
131 | * @oid, @oloc: object to lock | |
132 | * @lock_name: the name of the lock | |
133 | * @cookie: user-defined identifier for this instance of the lock | |
134 | * @locker: current lock owner | |
135 | */ | |
136 | int ceph_cls_break_lock(struct ceph_osd_client *osdc, | |
137 | struct ceph_object_id *oid, | |
138 | struct ceph_object_locator *oloc, | |
139 | char *lock_name, char *cookie, | |
140 | struct ceph_entity_name *locker) | |
141 | { | |
142 | int break_op_buf_size; | |
143 | int name_len = strlen(lock_name); | |
144 | int cookie_len = strlen(cookie); | |
145 | struct page *break_op_page; | |
146 | void *p, *end; | |
147 | int ret; | |
148 | ||
149 | break_op_buf_size = name_len + sizeof(__le32) + | |
150 | cookie_len + sizeof(__le32) + | |
151 | sizeof(u8) + sizeof(__le64) + | |
152 | CEPH_ENCODING_START_BLK_LEN; | |
153 | if (break_op_buf_size > PAGE_SIZE) | |
154 | return -E2BIG; | |
155 | ||
156 | break_op_page = alloc_page(GFP_NOIO); | |
157 | if (!break_op_page) | |
158 | return -ENOMEM; | |
159 | ||
160 | p = page_address(break_op_page); | |
161 | end = p + break_op_buf_size; | |
162 | ||
163 | /* encode cls_lock_break_op struct */ | |
164 | ceph_start_encoding(&p, 1, 1, | |
165 | break_op_buf_size - CEPH_ENCODING_START_BLK_LEN); | |
166 | ceph_encode_string(&p, end, lock_name, name_len); | |
167 | ceph_encode_copy(&p, locker, sizeof(*locker)); | |
168 | ceph_encode_string(&p, end, cookie, cookie_len); | |
169 | ||
170 | dout("%s lock_name %s cookie %s locker %s%llu\n", __func__, lock_name, | |
171 | cookie, ENTITY_NAME(*locker)); | |
172 | ret = ceph_osdc_call(osdc, oid, oloc, "lock", "break_lock", | |
173 | CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, | |
174 | break_op_page, break_op_buf_size, NULL, NULL); | |
175 | ||
176 | dout("%s: status %d\n", __func__, ret); | |
177 | __free_page(break_op_page); | |
178 | return ret; | |
179 | } | |
180 | EXPORT_SYMBOL(ceph_cls_break_lock); | |
d4ed4a53 DF |
181 | |
182 | void ceph_free_lockers(struct ceph_locker *lockers, u32 num_lockers) | |
183 | { | |
184 | int i; | |
185 | ||
186 | for (i = 0; i < num_lockers; i++) | |
187 | kfree(lockers[i].id.cookie); | |
188 | kfree(lockers); | |
189 | } | |
190 | EXPORT_SYMBOL(ceph_free_lockers); | |
191 | ||
192 | static int decode_locker(void **p, void *end, struct ceph_locker *locker) | |
193 | { | |
194 | u8 struct_v; | |
195 | u32 len; | |
196 | char *s; | |
197 | int ret; | |
198 | ||
199 | ret = ceph_start_decoding(p, end, 1, "locker_id_t", &struct_v, &len); | |
200 | if (ret) | |
201 | return ret; | |
202 | ||
203 | ceph_decode_copy(p, &locker->id.name, sizeof(locker->id.name)); | |
204 | s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO); | |
205 | if (IS_ERR(s)) | |
206 | return PTR_ERR(s); | |
207 | ||
208 | locker->id.cookie = s; | |
209 | ||
210 | ret = ceph_start_decoding(p, end, 1, "locker_info_t", &struct_v, &len); | |
211 | if (ret) | |
212 | return ret; | |
213 | ||
214 | *p += sizeof(struct ceph_timespec); /* skip expiration */ | |
215 | ceph_decode_copy(p, &locker->info.addr, sizeof(locker->info.addr)); | |
216 | ceph_decode_addr(&locker->info.addr); | |
217 | len = ceph_decode_32(p); | |
218 | *p += len; /* skip description */ | |
219 | ||
220 | dout("%s %s%llu cookie %s addr %s\n", __func__, | |
221 | ENTITY_NAME(locker->id.name), locker->id.cookie, | |
222 | ceph_pr_addr(&locker->info.addr.in_addr)); | |
223 | return 0; | |
224 | } | |
225 | ||
226 | static int decode_lockers(void **p, void *end, u8 *type, char **tag, | |
227 | struct ceph_locker **lockers, u32 *num_lockers) | |
228 | { | |
229 | u8 struct_v; | |
230 | u32 struct_len; | |
231 | char *s; | |
232 | int i; | |
233 | int ret; | |
234 | ||
235 | ret = ceph_start_decoding(p, end, 1, "cls_lock_get_info_reply", | |
236 | &struct_v, &struct_len); | |
237 | if (ret) | |
238 | return ret; | |
239 | ||
240 | *num_lockers = ceph_decode_32(p); | |
241 | *lockers = kcalloc(*num_lockers, sizeof(**lockers), GFP_NOIO); | |
242 | if (!*lockers) | |
243 | return -ENOMEM; | |
244 | ||
245 | for (i = 0; i < *num_lockers; i++) { | |
246 | ret = decode_locker(p, end, *lockers + i); | |
247 | if (ret) | |
248 | goto err_free_lockers; | |
249 | } | |
250 | ||
251 | *type = ceph_decode_8(p); | |
252 | s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO); | |
253 | if (IS_ERR(s)) { | |
254 | ret = PTR_ERR(s); | |
255 | goto err_free_lockers; | |
256 | } | |
257 | ||
258 | *tag = s; | |
259 | return 0; | |
260 | ||
261 | err_free_lockers: | |
262 | ceph_free_lockers(*lockers, *num_lockers); | |
263 | return ret; | |
264 | } | |
265 | ||
266 | /* | |
267 | * On success, the caller is responsible for: | |
268 | * | |
269 | * kfree(tag); | |
270 | * ceph_free_lockers(lockers, num_lockers); | |
271 | */ | |
272 | int ceph_cls_lock_info(struct ceph_osd_client *osdc, | |
273 | struct ceph_object_id *oid, | |
274 | struct ceph_object_locator *oloc, | |
275 | char *lock_name, u8 *type, char **tag, | |
276 | struct ceph_locker **lockers, u32 *num_lockers) | |
277 | { | |
278 | int get_info_op_buf_size; | |
279 | int name_len = strlen(lock_name); | |
280 | struct page *get_info_op_page, *reply_page; | |
281 | size_t reply_len; | |
282 | void *p, *end; | |
283 | int ret; | |
284 | ||
285 | get_info_op_buf_size = name_len + sizeof(__le32) + | |
286 | CEPH_ENCODING_START_BLK_LEN; | |
287 | if (get_info_op_buf_size > PAGE_SIZE) | |
288 | return -E2BIG; | |
289 | ||
290 | get_info_op_page = alloc_page(GFP_NOIO); | |
291 | if (!get_info_op_page) | |
292 | return -ENOMEM; | |
293 | ||
294 | reply_page = alloc_page(GFP_NOIO); | |
295 | if (!reply_page) { | |
296 | __free_page(get_info_op_page); | |
297 | return -ENOMEM; | |
298 | } | |
299 | ||
300 | p = page_address(get_info_op_page); | |
301 | end = p + get_info_op_buf_size; | |
302 | ||
303 | /* encode cls_lock_get_info_op struct */ | |
304 | ceph_start_encoding(&p, 1, 1, | |
305 | get_info_op_buf_size - CEPH_ENCODING_START_BLK_LEN); | |
306 | ceph_encode_string(&p, end, lock_name, name_len); | |
307 | ||
308 | dout("%s lock_name %s\n", __func__, lock_name); | |
309 | ret = ceph_osdc_call(osdc, oid, oloc, "lock", "get_info", | |
310 | CEPH_OSD_FLAG_READ, get_info_op_page, | |
311 | get_info_op_buf_size, reply_page, &reply_len); | |
312 | ||
313 | dout("%s: status %d\n", __func__, ret); | |
314 | if (ret >= 0) { | |
315 | p = page_address(reply_page); | |
316 | end = p + reply_len; | |
317 | ||
318 | ret = decode_lockers(&p, end, type, tag, lockers, num_lockers); | |
319 | } | |
320 | ||
321 | __free_page(get_info_op_page); | |
322 | __free_page(reply_page); | |
323 | return ret; | |
324 | } | |
325 | EXPORT_SYMBOL(ceph_cls_lock_info); |