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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f66241cb DF |
2 | #include <linux/ceph/ceph_debug.h> |
3 | ||
4 | #include <linux/types.h> | |
5 | #include <linux/slab.h> | |
6 | ||
7 | #include <linux/ceph/cls_lock_client.h> | |
8 | #include <linux/ceph/decode.h> | |
9 | ||
10 | /** | |
11 | * ceph_cls_lock - grab rados lock for object | |
12 | * @oid, @oloc: object to lock | |
13 | * @lock_name: the name of the lock | |
14 | * @type: lock type (CEPH_CLS_LOCK_EXCLUSIVE or CEPH_CLS_LOCK_SHARED) | |
15 | * @cookie: user-defined identifier for this instance of the lock | |
16 | * @tag: user-defined tag | |
17 | * @desc: user-defined lock description | |
18 | * @flags: lock flags | |
19 | * | |
20 | * All operations on the same lock should use the same tag. | |
21 | */ | |
22 | int ceph_cls_lock(struct ceph_osd_client *osdc, | |
23 | struct ceph_object_id *oid, | |
24 | struct ceph_object_locator *oloc, | |
25 | char *lock_name, u8 type, char *cookie, | |
26 | char *tag, char *desc, u8 flags) | |
27 | { | |
28 | int lock_op_buf_size; | |
29 | int name_len = strlen(lock_name); | |
30 | int cookie_len = strlen(cookie); | |
31 | int tag_len = strlen(tag); | |
32 | int desc_len = strlen(desc); | |
33 | void *p, *end; | |
34 | struct page *lock_op_page; | |
35 | struct timespec mtime; | |
36 | int ret; | |
37 | ||
38 | lock_op_buf_size = name_len + sizeof(__le32) + | |
39 | cookie_len + sizeof(__le32) + | |
40 | tag_len + sizeof(__le32) + | |
41 | desc_len + sizeof(__le32) + | |
42 | sizeof(struct ceph_timespec) + | |
43 | /* flag and type */ | |
44 | sizeof(u8) + sizeof(u8) + | |
45 | CEPH_ENCODING_START_BLK_LEN; | |
46 | if (lock_op_buf_size > PAGE_SIZE) | |
47 | return -E2BIG; | |
48 | ||
49 | lock_op_page = alloc_page(GFP_NOIO); | |
50 | if (!lock_op_page) | |
51 | return -ENOMEM; | |
52 | ||
53 | p = page_address(lock_op_page); | |
54 | end = p + lock_op_buf_size; | |
55 | ||
56 | /* encode cls_lock_lock_op struct */ | |
57 | ceph_start_encoding(&p, 1, 1, | |
58 | lock_op_buf_size - CEPH_ENCODING_START_BLK_LEN); | |
59 | ceph_encode_string(&p, end, lock_name, name_len); | |
60 | ceph_encode_8(&p, type); | |
61 | ceph_encode_string(&p, end, cookie, cookie_len); | |
62 | ceph_encode_string(&p, end, tag, tag_len); | |
63 | ceph_encode_string(&p, end, desc, desc_len); | |
64 | /* only support infinite duration */ | |
65 | memset(&mtime, 0, sizeof(mtime)); | |
66 | ceph_encode_timespec(p, &mtime); | |
67 | p += sizeof(struct ceph_timespec); | |
68 | ceph_encode_8(&p, flags); | |
69 | ||
70 | dout("%s lock_name %s type %d cookie %s tag %s desc %s flags 0x%x\n", | |
71 | __func__, lock_name, type, cookie, tag, desc, flags); | |
72 | ret = ceph_osdc_call(osdc, oid, oloc, "lock", "lock", | |
54ea0046 ID |
73 | CEPH_OSD_FLAG_WRITE, lock_op_page, |
74 | lock_op_buf_size, NULL, NULL); | |
f66241cb DF |
75 | |
76 | dout("%s: status %d\n", __func__, ret); | |
77 | __free_page(lock_op_page); | |
78 | return ret; | |
79 | } | |
80 | EXPORT_SYMBOL(ceph_cls_lock); | |
81 | ||
82 | /** | |
83 | * ceph_cls_unlock - release rados lock for object | |
84 | * @oid, @oloc: object to lock | |
85 | * @lock_name: the name of the lock | |
86 | * @cookie: user-defined identifier for this instance of the lock | |
87 | */ | |
88 | int ceph_cls_unlock(struct ceph_osd_client *osdc, | |
89 | struct ceph_object_id *oid, | |
90 | struct ceph_object_locator *oloc, | |
91 | char *lock_name, char *cookie) | |
92 | { | |
93 | int unlock_op_buf_size; | |
94 | int name_len = strlen(lock_name); | |
95 | int cookie_len = strlen(cookie); | |
96 | void *p, *end; | |
97 | struct page *unlock_op_page; | |
98 | int ret; | |
99 | ||
100 | unlock_op_buf_size = name_len + sizeof(__le32) + | |
101 | cookie_len + sizeof(__le32) + | |
102 | CEPH_ENCODING_START_BLK_LEN; | |
103 | if (unlock_op_buf_size > PAGE_SIZE) | |
104 | return -E2BIG; | |
105 | ||
106 | unlock_op_page = alloc_page(GFP_NOIO); | |
107 | if (!unlock_op_page) | |
108 | return -ENOMEM; | |
109 | ||
110 | p = page_address(unlock_op_page); | |
111 | end = p + unlock_op_buf_size; | |
112 | ||
113 | /* encode cls_lock_unlock_op struct */ | |
114 | ceph_start_encoding(&p, 1, 1, | |
115 | unlock_op_buf_size - CEPH_ENCODING_START_BLK_LEN); | |
116 | ceph_encode_string(&p, end, lock_name, name_len); | |
117 | ceph_encode_string(&p, end, cookie, cookie_len); | |
118 | ||
119 | dout("%s lock_name %s cookie %s\n", __func__, lock_name, cookie); | |
120 | ret = ceph_osdc_call(osdc, oid, oloc, "lock", "unlock", | |
54ea0046 ID |
121 | CEPH_OSD_FLAG_WRITE, unlock_op_page, |
122 | unlock_op_buf_size, NULL, NULL); | |
f66241cb DF |
123 | |
124 | dout("%s: status %d\n", __func__, ret); | |
125 | __free_page(unlock_op_page); | |
126 | return ret; | |
127 | } | |
128 | EXPORT_SYMBOL(ceph_cls_unlock); | |
129 | ||
130 | /** | |
131 | * ceph_cls_break_lock - release rados lock for object for specified client | |
132 | * @oid, @oloc: object to lock | |
133 | * @lock_name: the name of the lock | |
134 | * @cookie: user-defined identifier for this instance of the lock | |
135 | * @locker: current lock owner | |
136 | */ | |
137 | int ceph_cls_break_lock(struct ceph_osd_client *osdc, | |
138 | struct ceph_object_id *oid, | |
139 | struct ceph_object_locator *oloc, | |
140 | char *lock_name, char *cookie, | |
141 | struct ceph_entity_name *locker) | |
142 | { | |
143 | int break_op_buf_size; | |
144 | int name_len = strlen(lock_name); | |
145 | int cookie_len = strlen(cookie); | |
146 | struct page *break_op_page; | |
147 | void *p, *end; | |
148 | int ret; | |
149 | ||
150 | break_op_buf_size = name_len + sizeof(__le32) + | |
151 | cookie_len + sizeof(__le32) + | |
152 | sizeof(u8) + sizeof(__le64) + | |
153 | CEPH_ENCODING_START_BLK_LEN; | |
154 | if (break_op_buf_size > PAGE_SIZE) | |
155 | return -E2BIG; | |
156 | ||
157 | break_op_page = alloc_page(GFP_NOIO); | |
158 | if (!break_op_page) | |
159 | return -ENOMEM; | |
160 | ||
161 | p = page_address(break_op_page); | |
162 | end = p + break_op_buf_size; | |
163 | ||
164 | /* encode cls_lock_break_op struct */ | |
165 | ceph_start_encoding(&p, 1, 1, | |
166 | break_op_buf_size - CEPH_ENCODING_START_BLK_LEN); | |
167 | ceph_encode_string(&p, end, lock_name, name_len); | |
168 | ceph_encode_copy(&p, locker, sizeof(*locker)); | |
169 | ceph_encode_string(&p, end, cookie, cookie_len); | |
170 | ||
171 | dout("%s lock_name %s cookie %s locker %s%llu\n", __func__, lock_name, | |
172 | cookie, ENTITY_NAME(*locker)); | |
173 | ret = ceph_osdc_call(osdc, oid, oloc, "lock", "break_lock", | |
54ea0046 ID |
174 | CEPH_OSD_FLAG_WRITE, break_op_page, |
175 | break_op_buf_size, NULL, NULL); | |
f66241cb DF |
176 | |
177 | dout("%s: status %d\n", __func__, ret); | |
178 | __free_page(break_op_page); | |
179 | return ret; | |
180 | } | |
181 | EXPORT_SYMBOL(ceph_cls_break_lock); | |
d4ed4a53 | 182 | |
14bb211d ID |
183 | int ceph_cls_set_cookie(struct ceph_osd_client *osdc, |
184 | struct ceph_object_id *oid, | |
185 | struct ceph_object_locator *oloc, | |
186 | char *lock_name, u8 type, char *old_cookie, | |
187 | char *tag, char *new_cookie) | |
188 | { | |
189 | int cookie_op_buf_size; | |
190 | int name_len = strlen(lock_name); | |
191 | int old_cookie_len = strlen(old_cookie); | |
192 | int tag_len = strlen(tag); | |
193 | int new_cookie_len = strlen(new_cookie); | |
194 | void *p, *end; | |
195 | struct page *cookie_op_page; | |
196 | int ret; | |
197 | ||
198 | cookie_op_buf_size = name_len + sizeof(__le32) + | |
199 | old_cookie_len + sizeof(__le32) + | |
200 | tag_len + sizeof(__le32) + | |
201 | new_cookie_len + sizeof(__le32) + | |
202 | sizeof(u8) + CEPH_ENCODING_START_BLK_LEN; | |
203 | if (cookie_op_buf_size > PAGE_SIZE) | |
204 | return -E2BIG; | |
205 | ||
206 | cookie_op_page = alloc_page(GFP_NOIO); | |
207 | if (!cookie_op_page) | |
208 | return -ENOMEM; | |
209 | ||
210 | p = page_address(cookie_op_page); | |
211 | end = p + cookie_op_buf_size; | |
212 | ||
213 | /* encode cls_lock_set_cookie_op struct */ | |
214 | ceph_start_encoding(&p, 1, 1, | |
215 | cookie_op_buf_size - CEPH_ENCODING_START_BLK_LEN); | |
216 | ceph_encode_string(&p, end, lock_name, name_len); | |
217 | ceph_encode_8(&p, type); | |
218 | ceph_encode_string(&p, end, old_cookie, old_cookie_len); | |
219 | ceph_encode_string(&p, end, tag, tag_len); | |
220 | ceph_encode_string(&p, end, new_cookie, new_cookie_len); | |
221 | ||
222 | dout("%s lock_name %s type %d old_cookie %s tag %s new_cookie %s\n", | |
223 | __func__, lock_name, type, old_cookie, tag, new_cookie); | |
224 | ret = ceph_osdc_call(osdc, oid, oloc, "lock", "set_cookie", | |
225 | CEPH_OSD_FLAG_WRITE, cookie_op_page, | |
226 | cookie_op_buf_size, NULL, NULL); | |
227 | ||
228 | dout("%s: status %d\n", __func__, ret); | |
229 | __free_page(cookie_op_page); | |
230 | return ret; | |
231 | } | |
232 | EXPORT_SYMBOL(ceph_cls_set_cookie); | |
233 | ||
d4ed4a53 DF |
234 | void ceph_free_lockers(struct ceph_locker *lockers, u32 num_lockers) |
235 | { | |
236 | int i; | |
237 | ||
238 | for (i = 0; i < num_lockers; i++) | |
239 | kfree(lockers[i].id.cookie); | |
240 | kfree(lockers); | |
241 | } | |
242 | EXPORT_SYMBOL(ceph_free_lockers); | |
243 | ||
244 | static int decode_locker(void **p, void *end, struct ceph_locker *locker) | |
245 | { | |
246 | u8 struct_v; | |
247 | u32 len; | |
248 | char *s; | |
249 | int ret; | |
250 | ||
251 | ret = ceph_start_decoding(p, end, 1, "locker_id_t", &struct_v, &len); | |
252 | if (ret) | |
253 | return ret; | |
254 | ||
255 | ceph_decode_copy(p, &locker->id.name, sizeof(locker->id.name)); | |
256 | s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO); | |
257 | if (IS_ERR(s)) | |
258 | return PTR_ERR(s); | |
259 | ||
260 | locker->id.cookie = s; | |
261 | ||
262 | ret = ceph_start_decoding(p, end, 1, "locker_info_t", &struct_v, &len); | |
263 | if (ret) | |
264 | return ret; | |
265 | ||
266 | *p += sizeof(struct ceph_timespec); /* skip expiration */ | |
267 | ceph_decode_copy(p, &locker->info.addr, sizeof(locker->info.addr)); | |
268 | ceph_decode_addr(&locker->info.addr); | |
269 | len = ceph_decode_32(p); | |
270 | *p += len; /* skip description */ | |
271 | ||
272 | dout("%s %s%llu cookie %s addr %s\n", __func__, | |
273 | ENTITY_NAME(locker->id.name), locker->id.cookie, | |
274 | ceph_pr_addr(&locker->info.addr.in_addr)); | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int decode_lockers(void **p, void *end, u8 *type, char **tag, | |
279 | struct ceph_locker **lockers, u32 *num_lockers) | |
280 | { | |
281 | u8 struct_v; | |
282 | u32 struct_len; | |
283 | char *s; | |
284 | int i; | |
285 | int ret; | |
286 | ||
287 | ret = ceph_start_decoding(p, end, 1, "cls_lock_get_info_reply", | |
288 | &struct_v, &struct_len); | |
289 | if (ret) | |
290 | return ret; | |
291 | ||
292 | *num_lockers = ceph_decode_32(p); | |
293 | *lockers = kcalloc(*num_lockers, sizeof(**lockers), GFP_NOIO); | |
294 | if (!*lockers) | |
295 | return -ENOMEM; | |
296 | ||
297 | for (i = 0; i < *num_lockers; i++) { | |
298 | ret = decode_locker(p, end, *lockers + i); | |
299 | if (ret) | |
300 | goto err_free_lockers; | |
301 | } | |
302 | ||
303 | *type = ceph_decode_8(p); | |
304 | s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO); | |
305 | if (IS_ERR(s)) { | |
306 | ret = PTR_ERR(s); | |
307 | goto err_free_lockers; | |
308 | } | |
309 | ||
310 | *tag = s; | |
311 | return 0; | |
312 | ||
313 | err_free_lockers: | |
314 | ceph_free_lockers(*lockers, *num_lockers); | |
315 | return ret; | |
316 | } | |
317 | ||
318 | /* | |
319 | * On success, the caller is responsible for: | |
320 | * | |
321 | * kfree(tag); | |
322 | * ceph_free_lockers(lockers, num_lockers); | |
323 | */ | |
324 | int ceph_cls_lock_info(struct ceph_osd_client *osdc, | |
325 | struct ceph_object_id *oid, | |
326 | struct ceph_object_locator *oloc, | |
327 | char *lock_name, u8 *type, char **tag, | |
328 | struct ceph_locker **lockers, u32 *num_lockers) | |
329 | { | |
330 | int get_info_op_buf_size; | |
331 | int name_len = strlen(lock_name); | |
332 | struct page *get_info_op_page, *reply_page; | |
2544a020 | 333 | size_t reply_len = PAGE_SIZE; |
d4ed4a53 DF |
334 | void *p, *end; |
335 | int ret; | |
336 | ||
337 | get_info_op_buf_size = name_len + sizeof(__le32) + | |
338 | CEPH_ENCODING_START_BLK_LEN; | |
339 | if (get_info_op_buf_size > PAGE_SIZE) | |
340 | return -E2BIG; | |
341 | ||
342 | get_info_op_page = alloc_page(GFP_NOIO); | |
343 | if (!get_info_op_page) | |
344 | return -ENOMEM; | |
345 | ||
346 | reply_page = alloc_page(GFP_NOIO); | |
347 | if (!reply_page) { | |
348 | __free_page(get_info_op_page); | |
349 | return -ENOMEM; | |
350 | } | |
351 | ||
352 | p = page_address(get_info_op_page); | |
353 | end = p + get_info_op_buf_size; | |
354 | ||
355 | /* encode cls_lock_get_info_op struct */ | |
356 | ceph_start_encoding(&p, 1, 1, | |
357 | get_info_op_buf_size - CEPH_ENCODING_START_BLK_LEN); | |
358 | ceph_encode_string(&p, end, lock_name, name_len); | |
359 | ||
360 | dout("%s lock_name %s\n", __func__, lock_name); | |
361 | ret = ceph_osdc_call(osdc, oid, oloc, "lock", "get_info", | |
362 | CEPH_OSD_FLAG_READ, get_info_op_page, | |
363 | get_info_op_buf_size, reply_page, &reply_len); | |
364 | ||
365 | dout("%s: status %d\n", __func__, ret); | |
366 | if (ret >= 0) { | |
367 | p = page_address(reply_page); | |
368 | end = p + reply_len; | |
369 | ||
370 | ret = decode_lockers(&p, end, type, tag, lockers, num_lockers); | |
371 | } | |
372 | ||
373 | __free_page(get_info_op_page); | |
374 | __free_page(reply_page); | |
375 | return ret; | |
376 | } | |
377 | EXPORT_SYMBOL(ceph_cls_lock_info); |