Douglas Fuller | f66241c | 2015-06-18 13:06:10 -0700 | [diff] [blame] | 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", |
Ilya Dryomov | 54ea004 | 2017-02-11 18:48:41 +0100 | [diff] [blame] | 72 | CEPH_OSD_FLAG_WRITE, lock_op_page, |
| 73 | lock_op_buf_size, NULL, NULL); |
Douglas Fuller | f66241c | 2015-06-18 13:06:10 -0700 | [diff] [blame] | 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", |
Ilya Dryomov | 54ea004 | 2017-02-11 18:48:41 +0100 | [diff] [blame] | 120 | CEPH_OSD_FLAG_WRITE, unlock_op_page, |
| 121 | unlock_op_buf_size, NULL, NULL); |
Douglas Fuller | f66241c | 2015-06-18 13:06:10 -0700 | [diff] [blame] | 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", |
Ilya Dryomov | 54ea004 | 2017-02-11 18:48:41 +0100 | [diff] [blame] | 173 | CEPH_OSD_FLAG_WRITE, break_op_page, |
| 174 | break_op_buf_size, NULL, NULL); |
Douglas Fuller | f66241c | 2015-06-18 13:06:10 -0700 | [diff] [blame] | 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); |
Douglas Fuller | d4ed4a5 | 2015-06-29 16:55:42 -0700 | [diff] [blame] | 181 | |
Ilya Dryomov | 14bb211 | 2017-04-13 12:17:38 +0200 | [diff] [blame] | 182 | int ceph_cls_set_cookie(struct ceph_osd_client *osdc, |
| 183 | struct ceph_object_id *oid, |
| 184 | struct ceph_object_locator *oloc, |
| 185 | char *lock_name, u8 type, char *old_cookie, |
| 186 | char *tag, char *new_cookie) |
| 187 | { |
| 188 | int cookie_op_buf_size; |
| 189 | int name_len = strlen(lock_name); |
| 190 | int old_cookie_len = strlen(old_cookie); |
| 191 | int tag_len = strlen(tag); |
| 192 | int new_cookie_len = strlen(new_cookie); |
| 193 | void *p, *end; |
| 194 | struct page *cookie_op_page; |
| 195 | int ret; |
| 196 | |
| 197 | cookie_op_buf_size = name_len + sizeof(__le32) + |
| 198 | old_cookie_len + sizeof(__le32) + |
| 199 | tag_len + sizeof(__le32) + |
| 200 | new_cookie_len + sizeof(__le32) + |
| 201 | sizeof(u8) + CEPH_ENCODING_START_BLK_LEN; |
| 202 | if (cookie_op_buf_size > PAGE_SIZE) |
| 203 | return -E2BIG; |
| 204 | |
| 205 | cookie_op_page = alloc_page(GFP_NOIO); |
| 206 | if (!cookie_op_page) |
| 207 | return -ENOMEM; |
| 208 | |
| 209 | p = page_address(cookie_op_page); |
| 210 | end = p + cookie_op_buf_size; |
| 211 | |
| 212 | /* encode cls_lock_set_cookie_op struct */ |
| 213 | ceph_start_encoding(&p, 1, 1, |
| 214 | cookie_op_buf_size - CEPH_ENCODING_START_BLK_LEN); |
| 215 | ceph_encode_string(&p, end, lock_name, name_len); |
| 216 | ceph_encode_8(&p, type); |
| 217 | ceph_encode_string(&p, end, old_cookie, old_cookie_len); |
| 218 | ceph_encode_string(&p, end, tag, tag_len); |
| 219 | ceph_encode_string(&p, end, new_cookie, new_cookie_len); |
| 220 | |
| 221 | dout("%s lock_name %s type %d old_cookie %s tag %s new_cookie %s\n", |
| 222 | __func__, lock_name, type, old_cookie, tag, new_cookie); |
| 223 | ret = ceph_osdc_call(osdc, oid, oloc, "lock", "set_cookie", |
| 224 | CEPH_OSD_FLAG_WRITE, cookie_op_page, |
| 225 | cookie_op_buf_size, NULL, NULL); |
| 226 | |
| 227 | dout("%s: status %d\n", __func__, ret); |
| 228 | __free_page(cookie_op_page); |
| 229 | return ret; |
| 230 | } |
| 231 | EXPORT_SYMBOL(ceph_cls_set_cookie); |
| 232 | |
Douglas Fuller | d4ed4a5 | 2015-06-29 16:55:42 -0700 | [diff] [blame] | 233 | void ceph_free_lockers(struct ceph_locker *lockers, u32 num_lockers) |
| 234 | { |
| 235 | int i; |
| 236 | |
| 237 | for (i = 0; i < num_lockers; i++) |
| 238 | kfree(lockers[i].id.cookie); |
| 239 | kfree(lockers); |
| 240 | } |
| 241 | EXPORT_SYMBOL(ceph_free_lockers); |
| 242 | |
| 243 | static int decode_locker(void **p, void *end, struct ceph_locker *locker) |
| 244 | { |
| 245 | u8 struct_v; |
| 246 | u32 len; |
| 247 | char *s; |
| 248 | int ret; |
| 249 | |
| 250 | ret = ceph_start_decoding(p, end, 1, "locker_id_t", &struct_v, &len); |
| 251 | if (ret) |
| 252 | return ret; |
| 253 | |
| 254 | ceph_decode_copy(p, &locker->id.name, sizeof(locker->id.name)); |
| 255 | s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO); |
| 256 | if (IS_ERR(s)) |
| 257 | return PTR_ERR(s); |
| 258 | |
| 259 | locker->id.cookie = s; |
| 260 | |
| 261 | ret = ceph_start_decoding(p, end, 1, "locker_info_t", &struct_v, &len); |
| 262 | if (ret) |
| 263 | return ret; |
| 264 | |
| 265 | *p += sizeof(struct ceph_timespec); /* skip expiration */ |
| 266 | ceph_decode_copy(p, &locker->info.addr, sizeof(locker->info.addr)); |
| 267 | ceph_decode_addr(&locker->info.addr); |
| 268 | len = ceph_decode_32(p); |
| 269 | *p += len; /* skip description */ |
| 270 | |
| 271 | dout("%s %s%llu cookie %s addr %s\n", __func__, |
| 272 | ENTITY_NAME(locker->id.name), locker->id.cookie, |
| 273 | ceph_pr_addr(&locker->info.addr.in_addr)); |
| 274 | return 0; |
| 275 | } |
| 276 | |
| 277 | static int decode_lockers(void **p, void *end, u8 *type, char **tag, |
| 278 | struct ceph_locker **lockers, u32 *num_lockers) |
| 279 | { |
| 280 | u8 struct_v; |
| 281 | u32 struct_len; |
| 282 | char *s; |
| 283 | int i; |
| 284 | int ret; |
| 285 | |
| 286 | ret = ceph_start_decoding(p, end, 1, "cls_lock_get_info_reply", |
| 287 | &struct_v, &struct_len); |
| 288 | if (ret) |
| 289 | return ret; |
| 290 | |
| 291 | *num_lockers = ceph_decode_32(p); |
| 292 | *lockers = kcalloc(*num_lockers, sizeof(**lockers), GFP_NOIO); |
| 293 | if (!*lockers) |
| 294 | return -ENOMEM; |
| 295 | |
| 296 | for (i = 0; i < *num_lockers; i++) { |
| 297 | ret = decode_locker(p, end, *lockers + i); |
| 298 | if (ret) |
| 299 | goto err_free_lockers; |
| 300 | } |
| 301 | |
| 302 | *type = ceph_decode_8(p); |
| 303 | s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO); |
| 304 | if (IS_ERR(s)) { |
| 305 | ret = PTR_ERR(s); |
| 306 | goto err_free_lockers; |
| 307 | } |
| 308 | |
| 309 | *tag = s; |
| 310 | return 0; |
| 311 | |
| 312 | err_free_lockers: |
| 313 | ceph_free_lockers(*lockers, *num_lockers); |
| 314 | return ret; |
| 315 | } |
| 316 | |
| 317 | /* |
| 318 | * On success, the caller is responsible for: |
| 319 | * |
| 320 | * kfree(tag); |
| 321 | * ceph_free_lockers(lockers, num_lockers); |
| 322 | */ |
| 323 | int ceph_cls_lock_info(struct ceph_osd_client *osdc, |
| 324 | struct ceph_object_id *oid, |
| 325 | struct ceph_object_locator *oloc, |
| 326 | char *lock_name, u8 *type, char **tag, |
| 327 | struct ceph_locker **lockers, u32 *num_lockers) |
| 328 | { |
| 329 | int get_info_op_buf_size; |
| 330 | int name_len = strlen(lock_name); |
| 331 | struct page *get_info_op_page, *reply_page; |
Ilya Dryomov | 2544a02 | 2017-01-25 18:16:21 +0100 | [diff] [blame] | 332 | size_t reply_len = PAGE_SIZE; |
Douglas Fuller | d4ed4a5 | 2015-06-29 16:55:42 -0700 | [diff] [blame] | 333 | void *p, *end; |
| 334 | int ret; |
| 335 | |
| 336 | get_info_op_buf_size = name_len + sizeof(__le32) + |
| 337 | CEPH_ENCODING_START_BLK_LEN; |
| 338 | if (get_info_op_buf_size > PAGE_SIZE) |
| 339 | return -E2BIG; |
| 340 | |
| 341 | get_info_op_page = alloc_page(GFP_NOIO); |
| 342 | if (!get_info_op_page) |
| 343 | return -ENOMEM; |
| 344 | |
| 345 | reply_page = alloc_page(GFP_NOIO); |
| 346 | if (!reply_page) { |
| 347 | __free_page(get_info_op_page); |
| 348 | return -ENOMEM; |
| 349 | } |
| 350 | |
| 351 | p = page_address(get_info_op_page); |
| 352 | end = p + get_info_op_buf_size; |
| 353 | |
| 354 | /* encode cls_lock_get_info_op struct */ |
| 355 | ceph_start_encoding(&p, 1, 1, |
| 356 | get_info_op_buf_size - CEPH_ENCODING_START_BLK_LEN); |
| 357 | ceph_encode_string(&p, end, lock_name, name_len); |
| 358 | |
| 359 | dout("%s lock_name %s\n", __func__, lock_name); |
| 360 | ret = ceph_osdc_call(osdc, oid, oloc, "lock", "get_info", |
| 361 | CEPH_OSD_FLAG_READ, get_info_op_page, |
| 362 | get_info_op_buf_size, reply_page, &reply_len); |
| 363 | |
| 364 | dout("%s: status %d\n", __func__, ret); |
| 365 | if (ret >= 0) { |
| 366 | p = page_address(reply_page); |
| 367 | end = p + reply_len; |
| 368 | |
| 369 | ret = decode_lockers(&p, end, type, tag, lockers, num_lockers); |
| 370 | } |
| 371 | |
| 372 | __free_page(get_info_op_page); |
| 373 | __free_page(reply_page); |
| 374 | return ret; |
| 375 | } |
| 376 | EXPORT_SYMBOL(ceph_cls_lock_info); |