diff options
| -rw-r--r-- | include/linux/ceph/cls_lock_client.h | 22 | ||||
| -rw-r--r-- | net/ceph/cls_lock_client.c | 145 |
2 files changed, 167 insertions, 0 deletions
diff --git a/include/linux/ceph/cls_lock_client.h b/include/linux/ceph/cls_lock_client.h index 4e4dffef22bb..84884d8d4710 100644 --- a/include/linux/ceph/cls_lock_client.h +++ b/include/linux/ceph/cls_lock_client.h @@ -9,6 +9,20 @@ enum ceph_cls_lock_type { CEPH_CLS_LOCK_SHARED = 2, }; +struct ceph_locker_id { + struct ceph_entity_name name; /* locker's client name */ + char *cookie; /* locker's cookie */ +}; + +struct ceph_locker_info { + struct ceph_entity_addr addr; /* locker's address */ +}; + +struct ceph_locker { + struct ceph_locker_id id; + struct ceph_locker_info info; +}; + int ceph_cls_lock(struct ceph_osd_client *osdc, struct ceph_object_id *oid, struct ceph_object_locator *oloc, @@ -24,4 +38,12 @@ int ceph_cls_break_lock(struct ceph_osd_client *osdc, char *lock_name, char *cookie, struct ceph_entity_name *locker); +void ceph_free_lockers(struct ceph_locker *lockers, u32 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); + #endif diff --git a/net/ceph/cls_lock_client.c b/net/ceph/cls_lock_client.c index 2a314537f958..50f040fdb2a9 100644 --- a/net/ceph/cls_lock_client.c +++ b/net/ceph/cls_lock_client.c @@ -178,3 +178,148 @@ int ceph_cls_break_lock(struct ceph_osd_client *osdc, return ret; } EXPORT_SYMBOL(ceph_cls_break_lock); + +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 */ + ceph_decode_copy(p, &locker->info.addr, sizeof(locker->info.addr)); + ceph_decode_addr(&locker->info.addr); + 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.in_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; + 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); |