diff options
Diffstat (limited to 'net/ceph/cls_lock_client.c')
| -rw-r--r-- | net/ceph/cls_lock_client.c | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/net/ceph/cls_lock_client.c b/net/ceph/cls_lock_client.c new file mode 100644 index 000000000..17447c19d --- /dev/null +++ b/net/ceph/cls_lock_client.c @@ -0,0 +1,425 @@ +// 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); |