1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
4 #include <linux/types.h>
5 #include <linux/slab.h>
7 #include <linux/ceph/cls_lock_client.h>
8 #include <linux/ceph/decode.h>
9 #include <linux/ceph/libceph.h>
12 * ceph_cls_lock - grab rados lock for object
13 * @oid, @oloc: object to lock
14 * @lock_name: the name of the lock
15 * @type: lock type (CEPH_CLS_LOCK_EXCLUSIVE or CEPH_CLS_LOCK_SHARED)
16 * @cookie: user-defined identifier for this instance of the lock
17 * @tag: user-defined tag
18 * @desc: user-defined lock description
21 * All operations on the same lock should use the same tag.
23 int ceph_cls_lock(struct ceph_osd_client
*osdc
,
24 struct ceph_object_id
*oid
,
25 struct ceph_object_locator
*oloc
,
26 char *lock_name
, u8 type
, char *cookie
,
27 char *tag
, char *desc
, u8 flags
)
30 int name_len
= strlen(lock_name
);
31 int cookie_len
= strlen(cookie
);
32 int tag_len
= strlen(tag
);
33 int desc_len
= strlen(desc
);
35 struct page
*lock_op_page
;
36 struct timespec64 mtime
;
39 lock_op_buf_size
= name_len
+ sizeof(__le32
) +
40 cookie_len
+ sizeof(__le32
) +
41 tag_len
+ sizeof(__le32
) +
42 desc_len
+ sizeof(__le32
) +
43 sizeof(struct ceph_timespec
) +
45 sizeof(u8
) + sizeof(u8
) +
46 CEPH_ENCODING_START_BLK_LEN
;
47 if (lock_op_buf_size
> PAGE_SIZE
)
50 lock_op_page
= alloc_page(GFP_NOIO
);
54 p
= page_address(lock_op_page
);
55 end
= p
+ lock_op_buf_size
;
57 /* encode cls_lock_lock_op struct */
58 ceph_start_encoding(&p
, 1, 1,
59 lock_op_buf_size
- CEPH_ENCODING_START_BLK_LEN
);
60 ceph_encode_string(&p
, end
, lock_name
, name_len
);
61 ceph_encode_8(&p
, type
);
62 ceph_encode_string(&p
, end
, cookie
, cookie_len
);
63 ceph_encode_string(&p
, end
, tag
, tag_len
);
64 ceph_encode_string(&p
, end
, desc
, desc_len
);
65 /* only support infinite duration */
66 memset(&mtime
, 0, sizeof(mtime
));
67 ceph_encode_timespec64(p
, &mtime
);
68 p
+= sizeof(struct ceph_timespec
);
69 ceph_encode_8(&p
, flags
);
71 dout("%s lock_name %s type %d cookie %s tag %s desc %s flags 0x%x\n",
72 __func__
, lock_name
, type
, cookie
, tag
, desc
, flags
);
73 ret
= ceph_osdc_call(osdc
, oid
, oloc
, "lock", "lock",
74 CEPH_OSD_FLAG_WRITE
, lock_op_page
,
75 lock_op_buf_size
, NULL
, NULL
);
77 dout("%s: status %d\n", __func__
, ret
);
78 __free_page(lock_op_page
);
81 EXPORT_SYMBOL(ceph_cls_lock
);
84 * ceph_cls_unlock - release rados lock for object
85 * @oid, @oloc: object to lock
86 * @lock_name: the name of the lock
87 * @cookie: user-defined identifier for this instance of the lock
89 int ceph_cls_unlock(struct ceph_osd_client
*osdc
,
90 struct ceph_object_id
*oid
,
91 struct ceph_object_locator
*oloc
,
92 char *lock_name
, char *cookie
)
94 int unlock_op_buf_size
;
95 int name_len
= strlen(lock_name
);
96 int cookie_len
= strlen(cookie
);
98 struct page
*unlock_op_page
;
101 unlock_op_buf_size
= name_len
+ sizeof(__le32
) +
102 cookie_len
+ sizeof(__le32
) +
103 CEPH_ENCODING_START_BLK_LEN
;
104 if (unlock_op_buf_size
> PAGE_SIZE
)
107 unlock_op_page
= alloc_page(GFP_NOIO
);
111 p
= page_address(unlock_op_page
);
112 end
= p
+ unlock_op_buf_size
;
114 /* encode cls_lock_unlock_op struct */
115 ceph_start_encoding(&p
, 1, 1,
116 unlock_op_buf_size
- CEPH_ENCODING_START_BLK_LEN
);
117 ceph_encode_string(&p
, end
, lock_name
, name_len
);
118 ceph_encode_string(&p
, end
, cookie
, cookie_len
);
120 dout("%s lock_name %s cookie %s\n", __func__
, lock_name
, cookie
);
121 ret
= ceph_osdc_call(osdc
, oid
, oloc
, "lock", "unlock",
122 CEPH_OSD_FLAG_WRITE
, unlock_op_page
,
123 unlock_op_buf_size
, NULL
, NULL
);
125 dout("%s: status %d\n", __func__
, ret
);
126 __free_page(unlock_op_page
);
129 EXPORT_SYMBOL(ceph_cls_unlock
);
132 * ceph_cls_break_lock - release rados lock for object for specified client
133 * @oid, @oloc: object to lock
134 * @lock_name: the name of the lock
135 * @cookie: user-defined identifier for this instance of the lock
136 * @locker: current lock owner
138 int ceph_cls_break_lock(struct ceph_osd_client
*osdc
,
139 struct ceph_object_id
*oid
,
140 struct ceph_object_locator
*oloc
,
141 char *lock_name
, char *cookie
,
142 struct ceph_entity_name
*locker
)
144 int break_op_buf_size
;
145 int name_len
= strlen(lock_name
);
146 int cookie_len
= strlen(cookie
);
147 struct page
*break_op_page
;
151 break_op_buf_size
= name_len
+ sizeof(__le32
) +
152 cookie_len
+ sizeof(__le32
) +
153 sizeof(u8
) + sizeof(__le64
) +
154 CEPH_ENCODING_START_BLK_LEN
;
155 if (break_op_buf_size
> PAGE_SIZE
)
158 break_op_page
= alloc_page(GFP_NOIO
);
162 p
= page_address(break_op_page
);
163 end
= p
+ break_op_buf_size
;
165 /* encode cls_lock_break_op struct */
166 ceph_start_encoding(&p
, 1, 1,
167 break_op_buf_size
- CEPH_ENCODING_START_BLK_LEN
);
168 ceph_encode_string(&p
, end
, lock_name
, name_len
);
169 ceph_encode_copy(&p
, locker
, sizeof(*locker
));
170 ceph_encode_string(&p
, end
, cookie
, cookie_len
);
172 dout("%s lock_name %s cookie %s locker %s%llu\n", __func__
, lock_name
,
173 cookie
, ENTITY_NAME(*locker
));
174 ret
= ceph_osdc_call(osdc
, oid
, oloc
, "lock", "break_lock",
175 CEPH_OSD_FLAG_WRITE
, break_op_page
,
176 break_op_buf_size
, NULL
, NULL
);
178 dout("%s: status %d\n", __func__
, ret
);
179 __free_page(break_op_page
);
182 EXPORT_SYMBOL(ceph_cls_break_lock
);
184 int ceph_cls_set_cookie(struct ceph_osd_client
*osdc
,
185 struct ceph_object_id
*oid
,
186 struct ceph_object_locator
*oloc
,
187 char *lock_name
, u8 type
, char *old_cookie
,
188 char *tag
, char *new_cookie
)
190 int cookie_op_buf_size
;
191 int name_len
= strlen(lock_name
);
192 int old_cookie_len
= strlen(old_cookie
);
193 int tag_len
= strlen(tag
);
194 int new_cookie_len
= strlen(new_cookie
);
196 struct page
*cookie_op_page
;
199 cookie_op_buf_size
= name_len
+ sizeof(__le32
) +
200 old_cookie_len
+ sizeof(__le32
) +
201 tag_len
+ sizeof(__le32
) +
202 new_cookie_len
+ sizeof(__le32
) +
203 sizeof(u8
) + CEPH_ENCODING_START_BLK_LEN
;
204 if (cookie_op_buf_size
> PAGE_SIZE
)
207 cookie_op_page
= alloc_page(GFP_NOIO
);
211 p
= page_address(cookie_op_page
);
212 end
= p
+ cookie_op_buf_size
;
214 /* encode cls_lock_set_cookie_op struct */
215 ceph_start_encoding(&p
, 1, 1,
216 cookie_op_buf_size
- CEPH_ENCODING_START_BLK_LEN
);
217 ceph_encode_string(&p
, end
, lock_name
, name_len
);
218 ceph_encode_8(&p
, type
);
219 ceph_encode_string(&p
, end
, old_cookie
, old_cookie_len
);
220 ceph_encode_string(&p
, end
, tag
, tag_len
);
221 ceph_encode_string(&p
, end
, new_cookie
, new_cookie_len
);
223 dout("%s lock_name %s type %d old_cookie %s tag %s new_cookie %s\n",
224 __func__
, lock_name
, type
, old_cookie
, tag
, new_cookie
);
225 ret
= ceph_osdc_call(osdc
, oid
, oloc
, "lock", "set_cookie",
226 CEPH_OSD_FLAG_WRITE
, cookie_op_page
,
227 cookie_op_buf_size
, NULL
, NULL
);
229 dout("%s: status %d\n", __func__
, ret
);
230 __free_page(cookie_op_page
);
233 EXPORT_SYMBOL(ceph_cls_set_cookie
);
235 void ceph_free_lockers(struct ceph_locker
*lockers
, u32 num_lockers
)
239 for (i
= 0; i
< num_lockers
; i
++)
240 kfree(lockers
[i
].id
.cookie
);
243 EXPORT_SYMBOL(ceph_free_lockers
);
245 static int decode_locker(void **p
, void *end
, struct ceph_locker
*locker
)
252 ret
= ceph_start_decoding(p
, end
, 1, "locker_id_t", &struct_v
, &len
);
256 ceph_decode_copy(p
, &locker
->id
.name
, sizeof(locker
->id
.name
));
257 s
= ceph_extract_encoded_string(p
, end
, NULL
, GFP_NOIO
);
261 locker
->id
.cookie
= s
;
263 ret
= ceph_start_decoding(p
, end
, 1, "locker_info_t", &struct_v
, &len
);
267 *p
+= sizeof(struct ceph_timespec
); /* skip expiration */
269 ret
= ceph_decode_entity_addr(p
, end
, &locker
->info
.addr
);
273 len
= ceph_decode_32(p
);
274 *p
+= len
; /* skip description */
276 dout("%s %s%llu cookie %s addr %s\n", __func__
,
277 ENTITY_NAME(locker
->id
.name
), locker
->id
.cookie
,
278 ceph_pr_addr(&locker
->info
.addr
));
282 static int decode_lockers(void **p
, void *end
, u8
*type
, char **tag
,
283 struct ceph_locker
**lockers
, u32
*num_lockers
)
291 ret
= ceph_start_decoding(p
, end
, 1, "cls_lock_get_info_reply",
292 &struct_v
, &struct_len
);
296 *num_lockers
= ceph_decode_32(p
);
297 *lockers
= kcalloc(*num_lockers
, sizeof(**lockers
), GFP_NOIO
);
301 for (i
= 0; i
< *num_lockers
; i
++) {
302 ret
= decode_locker(p
, end
, *lockers
+ i
);
304 goto err_free_lockers
;
307 *type
= ceph_decode_8(p
);
308 s
= ceph_extract_encoded_string(p
, end
, NULL
, GFP_NOIO
);
311 goto err_free_lockers
;
318 ceph_free_lockers(*lockers
, *num_lockers
);
323 * On success, the caller is responsible for:
326 * ceph_free_lockers(lockers, num_lockers);
328 int ceph_cls_lock_info(struct ceph_osd_client
*osdc
,
329 struct ceph_object_id
*oid
,
330 struct ceph_object_locator
*oloc
,
331 char *lock_name
, u8
*type
, char **tag
,
332 struct ceph_locker
**lockers
, u32
*num_lockers
)
334 int get_info_op_buf_size
;
335 int name_len
= strlen(lock_name
);
336 struct page
*get_info_op_page
, *reply_page
;
337 size_t reply_len
= PAGE_SIZE
;
341 get_info_op_buf_size
= name_len
+ sizeof(__le32
) +
342 CEPH_ENCODING_START_BLK_LEN
;
343 if (get_info_op_buf_size
> PAGE_SIZE
)
346 get_info_op_page
= alloc_page(GFP_NOIO
);
347 if (!get_info_op_page
)
350 reply_page
= alloc_page(GFP_NOIO
);
352 __free_page(get_info_op_page
);
356 p
= page_address(get_info_op_page
);
357 end
= p
+ get_info_op_buf_size
;
359 /* encode cls_lock_get_info_op struct */
360 ceph_start_encoding(&p
, 1, 1,
361 get_info_op_buf_size
- CEPH_ENCODING_START_BLK_LEN
);
362 ceph_encode_string(&p
, end
, lock_name
, name_len
);
364 dout("%s lock_name %s\n", __func__
, lock_name
);
365 ret
= ceph_osdc_call(osdc
, oid
, oloc
, "lock", "get_info",
366 CEPH_OSD_FLAG_READ
, get_info_op_page
,
367 get_info_op_buf_size
, &reply_page
, &reply_len
);
369 dout("%s: status %d\n", __func__
, ret
);
371 p
= page_address(reply_page
);
374 ret
= decode_lockers(&p
, end
, type
, tag
, lockers
, num_lockers
);
377 __free_page(get_info_op_page
);
378 __free_page(reply_page
);
381 EXPORT_SYMBOL(ceph_cls_lock_info
);
383 int ceph_cls_assert_locked(struct ceph_osd_request
*req
, int which
,
384 char *lock_name
, u8 type
, char *cookie
, char *tag
)
386 int assert_op_buf_size
;
387 int name_len
= strlen(lock_name
);
388 int cookie_len
= strlen(cookie
);
389 int tag_len
= strlen(tag
);
394 assert_op_buf_size
= name_len
+ sizeof(__le32
) +
395 cookie_len
+ sizeof(__le32
) +
396 tag_len
+ sizeof(__le32
) +
397 sizeof(u8
) + CEPH_ENCODING_START_BLK_LEN
;
398 if (assert_op_buf_size
> PAGE_SIZE
)
401 ret
= osd_req_op_cls_init(req
, which
, "lock", "assert_locked");
405 pages
= ceph_alloc_page_vector(1, GFP_NOIO
);
407 return PTR_ERR(pages
);
409 p
= page_address(pages
[0]);
410 end
= p
+ assert_op_buf_size
;
412 /* encode cls_lock_assert_op struct */
413 ceph_start_encoding(&p
, 1, 1,
414 assert_op_buf_size
- CEPH_ENCODING_START_BLK_LEN
);
415 ceph_encode_string(&p
, end
, lock_name
, name_len
);
416 ceph_encode_8(&p
, type
);
417 ceph_encode_string(&p
, end
, cookie
, cookie_len
);
418 ceph_encode_string(&p
, end
, tag
, tag_len
);
421 osd_req_op_cls_request_data_pages(req
, which
, pages
, assert_op_buf_size
,
425 EXPORT_SYMBOL(ceph_cls_assert_locked
);