[linux.git] / net / ceph / cls_lock_client.c

// 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);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
f66241cb DF	2	#include <linux/ceph/ceph_debug.h>
	3
	4	#include <linux/types.h>
	5	#include <linux/slab.h>
	6
	7	#include <linux/ceph/cls_lock_client.h>
	8	#include <linux/ceph/decode.h>
22e8bd51	9	#include <linux/ceph/libceph.h>
f66241cb DF	10
	11	/**
	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
	19	* @flags: lock flags
	20	*
	21	* All operations on the same lock should use the same tag.
	22	*/
	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)
	28	{
	29	int lock_op_buf_size;
	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);
	34	void p, end;
	35	struct page *lock_op_page;
473bd2d7	36	struct timespec64 mtime;
f66241cb DF	37	int ret;
	38
	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) +
	44	/* flag and type */
	45	sizeof(u8) + sizeof(u8) +
	46	CEPH_ENCODING_START_BLK_LEN;
	47	if (lock_op_buf_size > PAGE_SIZE)
	48	return -E2BIG;
	49
	50	lock_op_page = alloc_page(GFP_NOIO);
	51	if (!lock_op_page)
	52	return -ENOMEM;
	53
	54	p = page_address(lock_op_page);
	55	end = p + lock_op_buf_size;
	56
	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));
473bd2d7	67	ceph_encode_timespec64(p, &mtime);
f66241cb DF	68	p += sizeof(struct ceph_timespec);
	69	ceph_encode_8(&p, flags);
	70
	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",
54ea0046 ID	74	CEPH_OSD_FLAG_WRITE, lock_op_page,
54ea0046 ID	75	lock_op_buf_size, NULL, NULL);
f66241cb DF	76
	77	dout("%s: status %d\n", __func__, ret);
	78	__free_page(lock_op_page);
	79	return ret;
	80	}
	81	EXPORT_SYMBOL(ceph_cls_lock);
	82
	83	/**
	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
	88	*/
	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)
	93	{
	94	int unlock_op_buf_size;
	95	int name_len = strlen(lock_name);
	96	int cookie_len = strlen(cookie);
	97	void p, end;
	98	struct page *unlock_op_page;
	99	int ret;
	100
	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)
	105	return -E2BIG;
	106
	107	unlock_op_page = alloc_page(GFP_NOIO);
	108	if (!unlock_op_page)
	109	return -ENOMEM;
	110
	111	p = page_address(unlock_op_page);
	112	end = p + unlock_op_buf_size;
	113
	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);
	119
	120	dout("%s lock_name %s cookie %s\n", __func__, lock_name, cookie);
	121	ret = ceph_osdc_call(osdc, oid, oloc, "lock", "unlock",
54ea0046 ID	122	CEPH_OSD_FLAG_WRITE, unlock_op_page,
54ea0046 ID	123	unlock_op_buf_size, NULL, NULL);
f66241cb DF	124
	125	dout("%s: status %d\n", __func__, ret);
	126	__free_page(unlock_op_page);
	127	return ret;
	128	}
	129	EXPORT_SYMBOL(ceph_cls_unlock);
	130
	131	/**
	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
	137	*/
	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)
	143	{
	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;
	148	void p, end;
	149	int ret;
	150
	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)
	156	return -E2BIG;
	157
	158	break_op_page = alloc_page(GFP_NOIO);
	159	if (!break_op_page)
	160	return -ENOMEM;
	161
	162	p = page_address(break_op_page);
	163	end = p + break_op_buf_size;
	164
	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);
	171
	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",
54ea0046 ID	175	CEPH_OSD_FLAG_WRITE, break_op_page,
54ea0046 ID	176	break_op_buf_size, NULL, NULL);
f66241cb DF	177
	178	dout("%s: status %d\n", __func__, ret);
	179	__free_page(break_op_page);
	180	return ret;
	181	}
	182	EXPORT_SYMBOL(ceph_cls_break_lock);
d4ed4a53	183
14bb211d ID	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)
	189	{
	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);
	195	void p, end;
	196	struct page *cookie_op_page;
	197	int ret;
	198
	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)
	205	return -E2BIG;
	206
	207	cookie_op_page = alloc_page(GFP_NOIO);
	208	if (!cookie_op_page)
	209	return -ENOMEM;
	210
	211	p = page_address(cookie_op_page);
	212	end = p + cookie_op_buf_size;
	213
	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);
	222
	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);
	228
	229	dout("%s: status %d\n", __func__, ret);
	230	__free_page(cookie_op_page);
	231	return ret;
	232	}
	233	EXPORT_SYMBOL(ceph_cls_set_cookie);
	234
d4ed4a53 DF	235	void ceph_free_lockers(struct ceph_locker *lockers, u32 num_lockers)
	236	{
	237	int i;
	238
	239	for (i = 0; i < num_lockers; i++)
	240	kfree(lockers[i].id.cookie);
	241	kfree(lockers);
	242	}
	243	EXPORT_SYMBOL(ceph_free_lockers);
	244
	245	static int decode_locker(void *p, void end, struct ceph_locker *locker)
	246	{
	247	u8 struct_v;
	248	u32 len;
	249	char *s;
	250	int ret;
	251
	252	ret = ceph_start_decoding(p, end, 1, "locker_id_t", &struct_v, &len);
	253	if (ret)
	254	return ret;
	255
	256	ceph_decode_copy(p, &locker->id.name, sizeof(locker->id.name));
	257	s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO);
	258	if (IS_ERR(s))
	259	return PTR_ERR(s);
	260
	261	locker->id.cookie = s;
	262
	263	ret = ceph_start_decoding(p, end, 1, "locker_info_t", &struct_v, &len);
	264	if (ret)
	265	return ret;
	266
	267	p += sizeof(struct ceph_timespec); / skip expiration */
2f9800c8 JL	268
	269	ret = ceph_decode_entity_addr(p, end, &locker->info.addr);
	270	if (ret)
	271	return ret;
	272
d4ed4a53 DF	273	len = ceph_decode_32(p);
	274	p += len; / skip description */
	275
	276	dout("%s %s%llu cookie %s addr %s\n", __func__,
	277	ENTITY_NAME(locker->id.name), locker->id.cookie,
b726ec97	278	ceph_pr_addr(&locker->info.addr));
d4ed4a53 DF	279	return 0;
	280	}
	281
	282	static int decode_lockers(void *p, void end, u8 type, char *tag,
	283	struct ceph_locker *lockers, u32 num_lockers)
	284	{
	285	u8 struct_v;
	286	u32 struct_len;
	287	char *s;
	288	int i;
	289	int ret;
	290
	291	ret = ceph_start_decoding(p, end, 1, "cls_lock_get_info_reply",
	292	&struct_v, &struct_len);
	293	if (ret)
	294	return ret;
	295
	296	*num_lockers = ceph_decode_32(p);
	297	lockers = kcalloc(num_lockers, sizeof(**lockers), GFP_NOIO);
	298	if (!*lockers)
	299	return -ENOMEM;
	300
	301	for (i = 0; i < *num_lockers; i++) {
	302	ret = decode_locker(p, end, *lockers + i);
	303	if (ret)
	304	goto err_free_lockers;
	305	}
	306
	307	*type = ceph_decode_8(p);
	308	s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO);
	309	if (IS_ERR(s)) {
	310	ret = PTR_ERR(s);
	311	goto err_free_lockers;
	312	}
	313
	314	*tag = s;
	315	return 0;
	316
	317	err_free_lockers:
	318	ceph_free_lockers(lockers, num_lockers);
	319	return ret;
	320	}
	321
	322	/*
	323	* On success, the caller is responsible for:
	324	*
	325	* kfree(tag);
	326	* ceph_free_lockers(lockers, num_lockers);
	327	*/
	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)
	333	{
	334	int get_info_op_buf_size;
	335	int name_len = strlen(lock_name);
	336	struct page get_info_op_page, reply_page;
2544a020	337	size_t reply_len = PAGE_SIZE;
d4ed4a53 DF	338	void p, end;
	339	int ret;
	340
	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)
	344	return -E2BIG;
	345
	346	get_info_op_page = alloc_page(GFP_NOIO);
	347	if (!get_info_op_page)
	348	return -ENOMEM;
	349
	350	reply_page = alloc_page(GFP_NOIO);
	351	if (!reply_page) {
	352	__free_page(get_info_op_page);
	353	return -ENOMEM;
	354	}
	355
	356	p = page_address(get_info_op_page);
	357	end = p + get_info_op_buf_size;
	358
	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);
	363
	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,
68ada915	367	get_info_op_buf_size, &reply_page, &reply_len);
d4ed4a53 DF	368
	369	dout("%s: status %d\n", __func__, ret);
	370	if (ret >= 0) {
	371	p = page_address(reply_page);
	372	end = p + reply_len;
	373
	374	ret = decode_lockers(&p, end, type, tag, lockers, num_lockers);
	375	}
	376
	377	__free_page(get_info_op_page);
	378	__free_page(reply_page);
	379	return ret;
	380	}
	381	EXPORT_SYMBOL(ceph_cls_lock_info);
22e8bd51 ID	382
	383	int ceph_cls_assert_locked(struct ceph_osd_request *req, int which,
	384	char lock_name, u8 type, char cookie, char *tag)
	385	{
	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);
	390	struct page **pages;
	391	void p, end;
	392	int ret;
	393
	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)
	399	return -E2BIG;
	400
	401	ret = osd_req_op_cls_init(req, which, "lock", "assert_locked");
	402	if (ret)
	403	return ret;
	404
	405	pages = ceph_alloc_page_vector(1, GFP_NOIO);
	406	if (IS_ERR(pages))
	407	return PTR_ERR(pages);
	408
	409	p = page_address(pages[0]);
	410	end = p + assert_op_buf_size;
	411
	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);
	419	WARN_ON(p != end);
	420
	421	osd_req_op_cls_request_data_pages(req, which, pages, assert_op_buf_size,
	422	0, false, true);
	423	return 0;
	424	}
	425	EXPORT_SYMBOL(ceph_cls_assert_locked);