// 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);