summaryrefslogtreecommitdiff
path: root/net/ceph/cls_lock_client.c
blob: 17447c19d9376f37a267c000edcad997cbbe0c5e (plain)
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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
// SPDX-License-Identifier: GPL-2.0
#include <linux/ceph/ceph_debug.h>

#include <linux/types.h>
#include <linux/slab.h>

#include <linux/ceph/cls_lock_client.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/libceph.h>

/**
 * ceph_cls_lock - grab rados lock for object
 * @oid, @oloc: object to lock
 * @lock_name: the name of the lock
 * @type: lock type (CEPH_CLS_LOCK_EXCLUSIVE or CEPH_CLS_LOCK_SHARED)
 * @cookie: user-defined identifier for this instance of the lock
 * @tag: user-defined tag
 * @desc: user-defined lock description
 * @flags: lock flags
 *
 * All operations on the same lock should use the same tag.
 */
int ceph_cls_lock(struct ceph_osd_client *osdc,
		  struct ceph_object_id *oid,
		  struct ceph_object_locator *oloc,
		  char *lock_name, u8 type, char *cookie,
		  char *tag, char *desc, u8 flags)
{
	int lock_op_buf_size;
	int name_len = strlen(lock_name);
	int cookie_len = strlen(cookie);
	int tag_len = strlen(tag);
	int desc_len = strlen(desc);
	void *p, *end;
	struct page *lock_op_page;
	struct timespec64 mtime;
	int ret;

	lock_op_buf_size = name_len + sizeof(__le32) +
			   cookie_len + sizeof(__le32) +
			   tag_len + sizeof(__le32) +
			   desc_len + sizeof(__le32) +
			   sizeof(struct ceph_timespec) +
			   /* flag and type */
			   sizeof(u8) + sizeof(u8) +
			   CEPH_ENCODING_START_BLK_LEN;
	if (lock_op_buf_size > PAGE_SIZE)
		return -E2BIG;

	lock_op_page = alloc_page(GFP_NOIO);
	if (!lock_op_page)
		return -ENOMEM;

	p = page_address(lock_op_page);
	end = p + lock_op_buf_size;

	/* encode cls_lock_lock_op struct */
	ceph_start_encoding(&p, 1, 1,
			    lock_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
	ceph_encode_string(&p, end, lock_name, name_len);
	ceph_encode_8(&p, type);
	ceph_encode_string(&p, end, cookie, cookie_len);
	ceph_encode_string(&p, end, tag, tag_len);
	ceph_encode_string(&p, end, desc, desc_len);
	/* only support infinite duration */
	memset(&mtime, 0, sizeof(mtime));
	ceph_encode_timespec64(p, &mtime);
	p += sizeof(struct ceph_timespec);
	ceph_encode_8(&p, flags);

	dout("%s lock_name %s type %d cookie %s tag %s desc %s flags 0x%x\n",
	     __func__, lock_name, type, cookie, tag, desc, flags);
	ret = ceph_osdc_call(osdc, oid, oloc, "lock", "lock",
			     CEPH_OSD_FLAG_WRITE, lock_op_page,
			     lock_op_buf_size, NULL, NULL);

	dout("%s: status %d\n", __func__, ret);
	__free_page(lock_op_page);
	return ret;
}
EXPORT_SYMBOL(ceph_cls_lock);

/**
 * ceph_cls_unlock - release rados lock for object
 * @oid, @oloc: object to lock
 * @lock_name: the name of the lock
 * @cookie: user-defined identifier for this instance of the lock
 */
int ceph_cls_unlock(struct ceph_osd_client *osdc,
		    struct ceph_object_id *oid,
		    struct ceph_object_locator *oloc,
		    char *lock_name, char *cookie)
{
	int unlock_op_buf_size;
	int name_len = strlen(lock_name);
	int cookie_len = strlen(cookie);
	void *p, *end;
	struct page *unlock_op_page;
	int ret;

	unlock_op_buf_size = name_len + sizeof(__le32) +
			     cookie_len + sizeof(__le32) +
			     CEPH_ENCODING_START_BLK_LEN;
	if (unlock_op_buf_size > PAGE_SIZE)
		return -E2BIG;

	unlock_op_page = alloc_page(GFP_NOIO);
	if (!unlock_op_page)
		return -ENOMEM;

	p = page_address(unlock_op_page);
	end = p + unlock_op_buf_size;

	/* encode cls_lock_unlock_op struct */
	ceph_start_encoding(&p, 1, 1,
			    unlock_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
	ceph_encode_string(&p, end, lock_name, name_len);
	ceph_encode_string(&p, end, cookie, cookie_len);

	dout("%s lock_name %s cookie %s\n", __func__, lock_name, cookie);
	ret = ceph_osdc_call(osdc, oid, oloc, "lock", "unlock",
			     CEPH_OSD_FLAG_WRITE, unlock_op_page,
			     unlock_op_buf_size, NULL, NULL);

	dout("%s: status %d\n", __func__, ret);
	__free_page(unlock_op_page);
	return ret;
}
EXPORT_SYMBOL(ceph_cls_unlock);

/**
 * ceph_cls_break_lock - release rados lock for object for specified client
 * @oid, @oloc: object to lock
 * @lock_name: the name of the lock
 * @cookie: user-defined identifier for this instance of the lock
 * @locker: current lock owner
 */
int ceph_cls_break_lock(struct ceph_osd_client *osdc,
			struct ceph_object_id *oid,
			struct ceph_object_locator *oloc,
			char *lock_name, char *cookie,
			struct ceph_entity_name *locker)
{
	int break_op_buf_size;
	int name_len = strlen(lock_name);
	int cookie_len = strlen(cookie);
	struct page *break_op_page;
	void *p, *end;
	int ret;

	break_op_buf_size = name_len + sizeof(__le32) +
			    cookie_len + sizeof(__le32) +
			    sizeof(u8) + sizeof(__le64) +
			    CEPH_ENCODING_START_BLK_LEN;
	if (break_op_buf_size > PAGE_SIZE)
		return -E2BIG;

	break_op_page = alloc_page(GFP_NOIO);
	if (!break_op_page)
		return -ENOMEM;

	p = page_address(break_op_page);
	end = p + break_op_buf_size;

	/* encode cls_lock_break_op struct */
	ceph_start_encoding(&p, 1, 1,
			    break_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
	ceph_encode_string(&p, end, lock_name, name_len);
	ceph_encode_copy(&p, locker, sizeof(*locker));
	ceph_encode_string(&p, end, cookie, cookie_len);

	dout("%s lock_name %s cookie %s locker %s%llu\n", __func__, lock_name,
	     cookie, ENTITY_NAME(*locker));
	ret = ceph_osdc_call(osdc, oid, oloc, "lock", "break_lock",
			     CEPH_OSD_FLAG_WRITE, break_op_page,
			     break_op_buf_size, NULL, NULL);

	dout("%s: status %d\n", __func__, ret);
	__free_page(break_op_page);
	return ret;
}
EXPORT_SYMBOL(ceph_cls_break_lock);

int ceph_cls_set_cookie(struct ceph_osd_client *osdc,
			struct ceph_object_id *oid,
			struct ceph_object_locator *oloc,
			char *lock_name, u8 type, char *old_cookie,
			char *tag, char *new_cookie)
{
	int cookie_op_buf_size;
	int name_len = strlen(lock_name);
	int old_cookie_len = strlen(old_cookie);
	int tag_len = strlen(tag);
	int new_cookie_len = strlen(new_cookie);
	void *p, *end;
	struct page *cookie_op_page;
	int ret;

	cookie_op_buf_size = name_len + sizeof(__le32) +
			     old_cookie_len + sizeof(__le32) +
			     tag_len + sizeof(__le32) +
			     new_cookie_len + sizeof(__le32) +
			     sizeof(u8) + CEPH_ENCODING_START_BLK_LEN;
	if (cookie_op_buf_size > PAGE_SIZE)
		return -E2BIG;

	cookie_op_page = alloc_page(GFP_NOIO);
	if (!cookie_op_page)
		return -ENOMEM;

	p = page_address(cookie_op_page);
	end = p + cookie_op_buf_size;

	/* encode cls_lock_set_cookie_op struct */
	ceph_start_encoding(&p, 1, 1,
			    cookie_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
	ceph_encode_string(&p, end, lock_name, name_len);
	ceph_encode_8(&p, type);
	ceph_encode_string(&p, end, old_cookie, old_cookie_len);
	ceph_encode_string(&p, end, tag, tag_len);
	ceph_encode_string(&p, end, new_cookie, new_cookie_len);

	dout("%s lock_name %s type %d old_cookie %s tag %s new_cookie %s\n",
	     __func__, lock_name, type, old_cookie, tag, new_cookie);
	ret = ceph_osdc_call(osdc, oid, oloc, "lock", "set_cookie",
			     CEPH_OSD_FLAG_WRITE, cookie_op_page,
			     cookie_op_buf_size, NULL, NULL);

	dout("%s: status %d\n", __func__, ret);
	__free_page(cookie_op_page);
	return ret;
}
EXPORT_SYMBOL(ceph_cls_set_cookie);

void ceph_free_lockers(struct ceph_locker *lockers, u32 num_lockers)
{
	int i;

	for (i = 0; i < num_lockers; i++)
		kfree(lockers[i].id.cookie);
	kfree(lockers);
}
EXPORT_SYMBOL(ceph_free_lockers);

static int decode_locker(void **p, void *end, struct ceph_locker *locker)
{
	u8 struct_v;
	u32 len;
	char *s;
	int ret;

	ret = ceph_start_decoding(p, end, 1, "locker_id_t", &struct_v, &len);
	if (ret)
		return ret;

	ceph_decode_copy(p, &locker->id.name, sizeof(locker->id.name));
	s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO);
	if (IS_ERR(s))
		return PTR_ERR(s);

	locker->id.cookie = s;

	ret = ceph_start_decoding(p, end, 1, "locker_info_t", &struct_v, &len);
	if (ret)
		return ret;

	*p += sizeof(struct ceph_timespec); /* skip expiration */

	ret = ceph_decode_entity_addr(p, end, &locker->info.addr);
	if (ret)
		return ret;

	len = ceph_decode_32(p);
	*p += len; /* skip description */

	dout("%s %s%llu cookie %s addr %s\n", __func__,
	     ENTITY_NAME(locker->id.name), locker->id.cookie,
	     ceph_pr_addr(&locker->info.addr));
	return 0;
}

static int decode_lockers(void **p, void *end, u8 *type, char **tag,
			  struct ceph_locker **lockers, u32 *num_lockers)
{
	u8 struct_v;
	u32 struct_len;
	char *s;
	int i;
	int ret;

	ret = ceph_start_decoding(p, end, 1, "cls_lock_get_info_reply",
				  &struct_v, &struct_len);
	if (ret)
		return ret;

	*num_lockers = ceph_decode_32(p);
	*lockers = kcalloc(*num_lockers, sizeof(**lockers), GFP_NOIO);
	if (!*lockers)
		return -ENOMEM;

	for (i = 0; i < *num_lockers; i++) {
		ret = decode_locker(p, end, *lockers + i);
		if (ret)
			goto err_free_lockers;
	}

	*type = ceph_decode_8(p);
	s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO);
	if (IS_ERR(s)) {
		ret = PTR_ERR(s);
		goto err_free_lockers;
	}

	*tag = s;
	return 0;

err_free_lockers:
	ceph_free_lockers(*lockers, *num_lockers);
	return ret;
}

/*
 * On success, the caller is responsible for:
 *
 *     kfree(tag);
 *     ceph_free_lockers(lockers, num_lockers);
 */
int ceph_cls_lock_info(struct ceph_osd_client *osdc,
		       struct ceph_object_id *oid,
		       struct ceph_object_locator *oloc,
		       char *lock_name, u8 *type, char **tag,
		       struct ceph_locker **lockers, u32 *num_lockers)
{
	int get_info_op_buf_size;
	int name_len = strlen(lock_name);
	struct page *get_info_op_page, *reply_page;
	size_t reply_len = PAGE_SIZE;
	void *p, *end;
	int ret;

	get_info_op_buf_size = name_len + sizeof(__le32) +
			       CEPH_ENCODING_START_BLK_LEN;
	if (get_info_op_buf_size > PAGE_SIZE)
		return -E2BIG;

	get_info_op_page = alloc_page(GFP_NOIO);
	if (!get_info_op_page)
		return -ENOMEM;

	reply_page = alloc_page(GFP_NOIO);
	if (!reply_page) {
		__free_page(get_info_op_page);
		return -ENOMEM;
	}

	p = page_address(get_info_op_page);
	end = p + get_info_op_buf_size;

	/* encode cls_lock_get_info_op struct */
	ceph_start_encoding(&p, 1, 1,
			    get_info_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
	ceph_encode_string(&p, end, lock_name, name_len);

	dout("%s lock_name %s\n", __func__, lock_name);
	ret = ceph_osdc_call(osdc, oid, oloc, "lock", "get_info",
			     CEPH_OSD_FLAG_READ, get_info_op_page,
			     get_info_op_buf_size, &reply_page, &reply_len);

	dout("%s: status %d\n", __func__, ret);
	if (ret >= 0) {
		p = page_address(reply_page);
		end = p + reply_len;

		ret = decode_lockers(&p, end, type, tag, lockers, num_lockers);
	}

	__free_page(get_info_op_page);
	__free_page(reply_page);
	return ret;
}
EXPORT_SYMBOL(ceph_cls_lock_info);

int ceph_cls_assert_locked(struct ceph_osd_request *req, int which,
			   char *lock_name, u8 type, char *cookie, char *tag)
{
	int assert_op_buf_size;
	int name_len = strlen(lock_name);
	int cookie_len = strlen(cookie);
	int tag_len = strlen(tag);
	struct page **pages;
	void *p, *end;
	int ret;

	assert_op_buf_size = name_len + sizeof(__le32) +
			     cookie_len + sizeof(__le32) +
			     tag_len + sizeof(__le32) +
			     sizeof(u8) + CEPH_ENCODING_START_BLK_LEN;
	if (assert_op_buf_size > PAGE_SIZE)
		return -E2BIG;

	ret = osd_req_op_cls_init(req, which, "lock", "assert_locked");
	if (ret)
		return ret;

	pages = ceph_alloc_page_vector(1, GFP_NOIO);
	if (IS_ERR(pages))
		return PTR_ERR(pages);

	p = page_address(pages[0]);
	end = p + assert_op_buf_size;

	/* encode cls_lock_assert_op struct */
	ceph_start_encoding(&p, 1, 1,
			    assert_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
	ceph_encode_string(&p, end, lock_name, name_len);
	ceph_encode_8(&p, type);
	ceph_encode_string(&p, end, cookie, cookie_len);
	ceph_encode_string(&p, end, tag, tag_len);
	WARN_ON(p != end);

	osd_req_op_cls_request_data_pages(req, which, pages, assert_op_buf_size,
					  0, false, true);
	return 0;
}
EXPORT_SYMBOL(ceph_cls_assert_locked);