[linux-2.6-block.git] / include / linux / ceph / decode.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __CEPH_DECODE_H
#define __CEPH_DECODE_H

#include <linux/err.h>
#include <linux/bug.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <asm/unaligned.h>

#include <linux/ceph/types.h>

/*
 * in all cases,
 *   void **p     pointer to position pointer
 *   void *end    pointer to end of buffer (last byte + 1)
 */

static inline u64 ceph_decode_64(void **p)
{
	u64 v = get_unaligned_le64(*p);
	*p += sizeof(u64);
	return v;
}
static inline u32 ceph_decode_32(void **p)
{
	u32 v = get_unaligned_le32(*p);
	*p += sizeof(u32);
	return v;
}
static inline u16 ceph_decode_16(void **p)
{
	u16 v = get_unaligned_le16(*p);
	*p += sizeof(u16);
	return v;
}
static inline u8 ceph_decode_8(void **p)
{
	u8 v = *(u8 *)*p;
	(*p)++;
	return v;
}
static inline void ceph_decode_copy(void **p, void *pv, size_t n)
{
	memcpy(pv, *p, n);
	*p += n;
}

/*
 * bounds check input.
 */
static inline bool ceph_has_room(void **p, void *end, size_t n)
{
	return end >= *p && n <= end - *p;
}

#define ceph_decode_need(p, end, n, bad)			\
	do {							\
		if (!likely(ceph_has_room(p, end, n)))		\
			goto bad;				\
	} while (0)

#define ceph_decode_64_safe(p, end, v, bad)			\
	do {							\
		ceph_decode_need(p, end, sizeof(u64), bad);	\
		v = ceph_decode_64(p);				\
	} while (0)
#define ceph_decode_32_safe(p, end, v, bad)			\
	do {							\
		ceph_decode_need(p, end, sizeof(u32), bad);	\
		v = ceph_decode_32(p);				\
	} while (0)
#define ceph_decode_16_safe(p, end, v, bad)			\
	do {							\
		ceph_decode_need(p, end, sizeof(u16), bad);	\
		v = ceph_decode_16(p);				\
	} while (0)
#define ceph_decode_8_safe(p, end, v, bad)			\
	do {							\
		ceph_decode_need(p, end, sizeof(u8), bad);	\
		v = ceph_decode_8(p);				\
	} while (0)

#define ceph_decode_copy_safe(p, end, pv, n, bad)		\
	do {							\
		ceph_decode_need(p, end, n, bad);		\
		ceph_decode_copy(p, pv, n);			\
	} while (0)

/*
 * Allocate a buffer big enough to hold the wire-encoded string, and
 * decode the string into it.  The resulting string will always be
 * terminated with '\0'.  If successful, *p will be advanced
 * past the decoded data.  Also, if lenp is not a null pointer, the
 * length (not including the terminating '\0') will be recorded in
 * *lenp.  Note that a zero-length string is a valid return value.
 *
 * Returns a pointer to the newly-allocated string buffer, or a
 * pointer-coded errno if an error occurs.  Neither *p nor *lenp
 * will have been updated if an error is returned.
 *
 * There are two possible failures:
 *   - converting the string would require accessing memory at or
 *     beyond the "end" pointer provided (-ERANGE)
 *   - memory could not be allocated for the result (-ENOMEM)
 */
static inline char *ceph_extract_encoded_string(void **p, void *end,
						size_t *lenp, gfp_t gfp)
{
	u32 len;
	void *sp = *p;
	char *buf;

	ceph_decode_32_safe(&sp, end, len, bad);
	if (!ceph_has_room(&sp, end, len))
		goto bad;

	buf = kmalloc(len + 1, gfp);
	if (!buf)
		return ERR_PTR(-ENOMEM);

	if (len)
		memcpy(buf, sp, len);
	buf[len] = '\0';

	*p = (char *) *p + sizeof (u32) + len;
	if (lenp)
		*lenp = (size_t) len;

	return buf;

bad:
	return ERR_PTR(-ERANGE);
}

/*
 * skip helpers
 */
#define ceph_decode_skip_n(p, end, n, bad)			\
	do {							\
		ceph_decode_need(p, end, n, bad);		\
                *p += n;					\
	} while (0)

#define ceph_decode_skip_64(p, end, bad)			\
ceph_decode_skip_n(p, end, sizeof(u64), bad)

#define ceph_decode_skip_32(p, end, bad)			\
ceph_decode_skip_n(p, end, sizeof(u32), bad)

#define ceph_decode_skip_16(p, end, bad)			\
ceph_decode_skip_n(p, end, sizeof(u16), bad)

#define ceph_decode_skip_8(p, end, bad)				\
ceph_decode_skip_n(p, end, sizeof(u8), bad)

#define ceph_decode_skip_string(p, end, bad)			\
	do {							\
		u32 len;					\
								\
		ceph_decode_32_safe(p, end, len, bad);		\
		ceph_decode_skip_n(p, end, len, bad);		\
	} while (0)

#define ceph_decode_skip_set(p, end, type, bad)			\
	do {							\
		u32 len;					\
								\
		ceph_decode_32_safe(p, end, len, bad);		\
		while (len--)					\
			ceph_decode_skip_##type(p, end, bad);	\
	} while (0)

#define ceph_decode_skip_map(p, end, ktype, vtype, bad)		\
	do {							\
		u32 len;					\
								\
		ceph_decode_32_safe(p, end, len, bad);		\
		while (len--) {					\
			ceph_decode_skip_##ktype(p, end, bad);	\
			ceph_decode_skip_##vtype(p, end, bad);	\
		}						\
	} while (0)

#define ceph_decode_skip_map_of_map(p, end, ktype1, ktype2, vtype2, bad) \
	do {							\
		u32 len;					\
								\
		ceph_decode_32_safe(p, end, len, bad);		\
		while (len--) {					\
			ceph_decode_skip_##ktype1(p, end, bad);	\
			ceph_decode_skip_map(p, end, ktype2, vtype2, bad); \
		}						\
	} while (0)

/*
 * struct ceph_timespec <-> struct timespec64
 */
static inline void ceph_decode_timespec64(struct timespec64 *ts,
					  const struct ceph_timespec *tv)
{
	/*
	 * This will still overflow in year 2106.  We could extend
	 * the protocol to steal two more bits from tv_nsec to
	 * add three more 136 year epochs after that the way ext4
	 * does if necessary.
	 */
	ts->tv_sec = (time64_t)le32_to_cpu(tv->tv_sec);
	ts->tv_nsec = (long)le32_to_cpu(tv->tv_nsec);
}
static inline void ceph_encode_timespec64(struct ceph_timespec *tv,
					  const struct timespec64 *ts)
{
	tv->tv_sec = cpu_to_le32((u32)ts->tv_sec);
	tv->tv_nsec = cpu_to_le32((u32)ts->tv_nsec);
}

/*
 * sockaddr_storage <-> ceph_sockaddr
 */
static inline void ceph_encode_addr(struct ceph_entity_addr *a)
{
	__be16 ss_family = htons(a->in_addr.ss_family);
	a->in_addr.ss_family = *(__u16 *)&ss_family;
}
static inline void ceph_decode_addr(struct ceph_entity_addr *a)
{
	__be16 ss_family = *(__be16 *)&a->in_addr.ss_family;
	a->in_addr.ss_family = ntohs(ss_family);
	WARN_ON(a->in_addr.ss_family == 512);
}

/*
 * encoders
 */
static inline void ceph_encode_64(void **p, u64 v)
{
	put_unaligned_le64(v, (__le64 *)*p);
	*p += sizeof(u64);
}
static inline void ceph_encode_32(void **p, u32 v)
{
	put_unaligned_le32(v, (__le32 *)*p);
	*p += sizeof(u32);
}
static inline void ceph_encode_16(void **p, u16 v)
{
	put_unaligned_le16(v, (__le16 *)*p);
	*p += sizeof(u16);
}
static inline void ceph_encode_8(void **p, u8 v)
{
	*(u8 *)*p = v;
	(*p)++;
}
static inline void ceph_encode_copy(void **p, const void *s, int len)
{
	memcpy(*p, s, len);
	*p += len;
}

/*
 * filepath, string encoders
 */
static inline void ceph_encode_filepath(void **p, void *end,
					u64 ino, const char *path)
{
	u32 len = path ? strlen(path) : 0;
	BUG_ON(*p + 1 + sizeof(ino) + sizeof(len) + len > end);
	ceph_encode_8(p, 1);
	ceph_encode_64(p, ino);
	ceph_encode_32(p, len);
	if (len)
		memcpy(*p, path, len);
	*p += len;
}

static inline void ceph_encode_string(void **p, void *end,
				      const char *s, u32 len)
{
	BUG_ON(*p + sizeof(len) + len > end);
	ceph_encode_32(p, len);
	if (len)
		memcpy(*p, s, len);
	*p += len;
}

/*
 * version and length starting block encoders/decoders
 */

/* current code version (u8) + compat code version (u8) + len of struct (u32) */
#define CEPH_ENCODING_START_BLK_LEN 6

/**
 * ceph_start_encoding - start encoding block
 * @struct_v: current (code) version of the encoding
 * @struct_compat: oldest code version that can decode it
 * @struct_len: length of struct encoding
 */
static inline void ceph_start_encoding(void **p, u8 struct_v, u8 struct_compat,
				       u32 struct_len)
{
	ceph_encode_8(p, struct_v);
	ceph_encode_8(p, struct_compat);
	ceph_encode_32(p, struct_len);
}

/**
 * ceph_start_decoding - start decoding block
 * @v: current version of the encoding that the code supports
 * @name: name of the struct (free-form)
 * @struct_v: out param for the encoding version
 * @struct_len: out param for the length of struct encoding
 *
 * Validates the length of struct encoding, so unsafe ceph_decode_*
 * variants can be used for decoding.
 */
static inline int ceph_start_decoding(void **p, void *end, u8 v,
				      const char *name, u8 *struct_v,
				      u32 *struct_len)
{
	u8 struct_compat;

	ceph_decode_need(p, end, CEPH_ENCODING_START_BLK_LEN, bad);
	*struct_v = ceph_decode_8(p);
	struct_compat = ceph_decode_8(p);
	if (v < struct_compat) {
		pr_warn("got struct_v %d struct_compat %d > %d of %s\n",
			*struct_v, struct_compat, v, name);
		return -EINVAL;
	}

	*struct_len = ceph_decode_32(p);
	ceph_decode_need(p, end, *struct_len, bad);
	return 0;

bad:
	return -ERANGE;
}

#define ceph_encode_need(p, end, n, bad)			\
	do {							\
		if (!likely(ceph_has_room(p, end, n)))		\
			goto bad;				\
	} while (0)

#define ceph_encode_64_safe(p, end, v, bad)			\
	do {							\
		ceph_encode_need(p, end, sizeof(u64), bad);	\
		ceph_encode_64(p, v);				\
	} while (0)
#define ceph_encode_32_safe(p, end, v, bad)			\
	do {							\
		ceph_encode_need(p, end, sizeof(u32), bad);	\
		ceph_encode_32(p, v);				\
	} while (0)
#define ceph_encode_16_safe(p, end, v, bad)			\
	do {							\
		ceph_encode_need(p, end, sizeof(u16), bad);	\
		ceph_encode_16(p, v);				\
	} while (0)
#define ceph_encode_8_safe(p, end, v, bad)			\
	do {							\
		ceph_encode_need(p, end, sizeof(u8), bad);	\
		ceph_encode_8(p, v);				\
	} while (0)

#define ceph_encode_copy_safe(p, end, pv, n, bad)		\
	do {							\
		ceph_encode_need(p, end, n, bad);		\
		ceph_encode_copy(p, pv, n);			\
	} while (0)
#define ceph_encode_string_safe(p, end, s, n, bad)		\
	do {							\
		ceph_encode_need(p, end, n, bad);		\
		ceph_encode_string(p, end, s, n);		\
	} while (0)


#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
31b8006e SW	2	#ifndef __CEPH_DECODE_H
	3	#define __CEPH_DECODE_H
	4
f8c36c58	5	#include <linux/err.h>
187f1882	6	#include <linux/bug.h>
b2aa5d0b	7	#include <linux/slab.h>
c7e337d6	8	#include <linux/time.h>
187f1882	9	#include <asm/unaligned.h>
31b8006e	10
a1ce3928	11	#include <linux/ceph/types.h>
c89136ea	12
31b8006e SW	13	/*
	14	* in all cases,
	15	* void **p pointer to position pointer
	16	* void *end pointer to end of buffer (last byte + 1)
	17	*/
	18
c89136ea SW	19	static inline u64 ceph_decode_64(void **p)
	20	{
	21	u64 v = get_unaligned_le64(*p);
	22	*p += sizeof(u64);
	23	return v;
	24	}
	25	static inline u32 ceph_decode_32(void **p)
	26	{
	27	u32 v = get_unaligned_le32(*p);
	28	*p += sizeof(u32);
	29	return v;
	30	}
	31	static inline u16 ceph_decode_16(void **p)
	32	{
	33	u16 v = get_unaligned_le16(*p);
	34	*p += sizeof(u16);
	35	return v;
	36	}
	37	static inline u8 ceph_decode_8(void **p)
	38	{
	39	u8 v = (u8 )*p;
	40	(*p)++;
	41	return v;
	42	}
	43	static inline void ceph_decode_copy(void *p, void pv, size_t n)
	44	{
	45	memcpy(pv, *p, n);
	46	*p += n;
	47	}
	48
31b8006e SW	49	/*
	50	* bounds check input.
	51	*/
3b33f692	52	static inline bool ceph_has_room(void *p, void end, size_t n)
76aa542f XW	53	{
	54	return end >= p && n <= end - p;
	55	}
	56
dd5f049d AE	57	#define ceph_decode_need(p, end, n, bad) \
	58	do { \
	59	if (!likely(ceph_has_room(p, end, n))) \
	60	goto bad; \
31b8006e SW	61	} while (0)
31b8006e SW	62
31b8006e SW	63	#define ceph_decode_64_safe(p, end, v, bad) \
	64	do { \
	65	ceph_decode_need(p, end, sizeof(u64), bad); \
c89136ea	66	v = ceph_decode_64(p); \
31b8006e SW	67	} while (0)
	68	#define ceph_decode_32_safe(p, end, v, bad) \
	69	do { \
	70	ceph_decode_need(p, end, sizeof(u32), bad); \
c89136ea	71	v = ceph_decode_32(p); \
31b8006e SW	72	} while (0)
	73	#define ceph_decode_16_safe(p, end, v, bad) \
	74	do { \
	75	ceph_decode_need(p, end, sizeof(u16), bad); \
c89136ea	76	v = ceph_decode_16(p); \
31b8006e	77	} while (0)
c7e337d6 SW	78	#define ceph_decode_8_safe(p, end, v, bad) \
	79	do { \
	80	ceph_decode_need(p, end, sizeof(u8), bad); \
	81	v = ceph_decode_8(p); \
	82	} while (0)
31b8006e SW	83
	84	#define ceph_decode_copy_safe(p, end, pv, n, bad) \
	85	do { \
	86	ceph_decode_need(p, end, n, bad); \
	87	ceph_decode_copy(p, pv, n); \
	88	} while (0)
	89
f8c36c58 AE	90	/*
	91	* Allocate a buffer big enough to hold the wire-encoded string, and
	92	* decode the string into it. The resulting string will always be
	93	* terminated with '\0'. If successful, *p will be advanced
	94	* past the decoded data. Also, if lenp is not a null pointer, the
	95	* length (not including the terminating '\0') will be recorded in
	96	* *lenp. Note that a zero-length string is a valid return value.
	97	*
	98	* Returns a pointer to the newly-allocated string buffer, or a
	99	* pointer-coded errno if an error occurs. Neither p nor lenp
	100	* will have been updated if an error is returned.
	101	*
	102	* There are two possible failures:
	103	* - converting the string would require accessing memory at or
dd5f049d AE	104	* beyond the "end" pointer provided (-ERANGE)
dd5f049d AE	105	* - memory could not be allocated for the result (-ENOMEM)
f8c36c58 AE	106	*/
	107	static inline char ceph_extract_encoded_string(void p, void end,
	108	size_t *lenp, gfp_t gfp)
	109	{
	110	u32 len;
	111	void sp = p;
	112	char *buf;
	113
	114	ceph_decode_32_safe(&sp, end, len, bad);
	115	if (!ceph_has_room(&sp, end, len))
	116	goto bad;
	117
	118	buf = kmalloc(len + 1, gfp);
	119	if (!buf)
	120	return ERR_PTR(-ENOMEM);
	121
	122	if (len)
	123	memcpy(buf, sp, len);
	124	buf[len] = '\0';
	125
	126	p = (char ) *p + sizeof (u32) + len;
	127	if (lenp)
	128	*lenp = (size_t) len;
	129
	130	return buf;
	131
	132	bad:
	133	return ERR_PTR(-ERANGE);
	134	}
	135
278b1d70 ID	136	/*
	137	* skip helpers
	138	*/
	139	#define ceph_decode_skip_n(p, end, n, bad) \
	140	do { \
	141	ceph_decode_need(p, end, n, bad); \
	142	*p += n; \
	143	} while (0)
	144
	145	#define ceph_decode_skip_64(p, end, bad) \
	146	ceph_decode_skip_n(p, end, sizeof(u64), bad)
	147
	148	#define ceph_decode_skip_32(p, end, bad) \
	149	ceph_decode_skip_n(p, end, sizeof(u32), bad)
	150
	151	#define ceph_decode_skip_16(p, end, bad) \
	152	ceph_decode_skip_n(p, end, sizeof(u16), bad)
	153
	154	#define ceph_decode_skip_8(p, end, bad) \
	155	ceph_decode_skip_n(p, end, sizeof(u8), bad)
	156
	157	#define ceph_decode_skip_string(p, end, bad) \
	158	do { \
	159	u32 len; \
	160	\
	161	ceph_decode_32_safe(p, end, len, bad); \
	162	ceph_decode_skip_n(p, end, len, bad); \
	163	} while (0)
	164
	165	#define ceph_decode_skip_set(p, end, type, bad) \
	166	do { \
	167	u32 len; \
	168	\
	169	ceph_decode_32_safe(p, end, len, bad); \
	170	while (len--) \
	171	ceph_decode_skip_##type(p, end, bad); \
	172	} while (0)
	173
	174	#define ceph_decode_skip_map(p, end, ktype, vtype, bad) \
	175	do { \
	176	u32 len; \
	177	\
	178	ceph_decode_32_safe(p, end, len, bad); \
	179	while (len--) { \
	180	ceph_decode_skip_##ktype(p, end, bad); \
	181	ceph_decode_skip_##vtype(p, end, bad); \
	182	} \
	183	} while (0)
	184
	185	#define ceph_decode_skip_map_of_map(p, end, ktype1, ktype2, vtype2, bad) \
	186	do { \
	187	u32 len; \
	188	\
	189	ceph_decode_32_safe(p, end, len, bad); \
	190	while (len--) { \
	191	ceph_decode_skip_##ktype1(p, end, bad); \
	192	ceph_decode_skip_map(p, end, ktype2, vtype2, bad); \
	193	} \
	194	} while (0)
	195
31b8006e	196	/*
473bd2d7	197	* struct ceph_timespec <-> struct timespec64
31b8006e	198	*/
473bd2d7 AB	199	static inline void ceph_decode_timespec64(struct timespec64 *ts,
	200	const struct ceph_timespec *tv)
	201	{
	202	/*
	203	* This will still overflow in year 2106. We could extend
	204	* the protocol to steal two more bits from tv_nsec to
	205	* add three more 136 year epochs after that the way ext4
	206	* does if necessary.
	207	*/
	208	ts->tv_sec = (time64_t)le32_to_cpu(tv->tv_sec);
	209	ts->tv_nsec = (long)le32_to_cpu(tv->tv_nsec);
	210	}
	211	static inline void ceph_encode_timespec64(struct ceph_timespec *tv,
	212	const struct timespec64 *ts)
	213	{
	214	tv->tv_sec = cpu_to_le32((u32)ts->tv_sec);
	215	tv->tv_nsec = cpu_to_le32((u32)ts->tv_nsec);
c89136ea	216	}
31b8006e	217
63f2d211 SW	218	/*
	219	* sockaddr_storage <-> ceph_sockaddr
	220	*/
	221	static inline void ceph_encode_addr(struct ceph_entity_addr *a)
	222	{
cd84db6e YS	223	__be16 ss_family = htons(a->in_addr.ss_family);
cd84db6e YS	224	a->in_addr.ss_family = (__u16 )&ss_family;
63f2d211 SW	225	}
	226	static inline void ceph_decode_addr(struct ceph_entity_addr *a)
	227	{
cd84db6e YS	228	__be16 ss_family = (__be16 )&a->in_addr.ss_family;
cd84db6e YS	229	a->in_addr.ss_family = ntohs(ss_family);
4e7a5dcd	230	WARN_ON(a->in_addr.ss_family == 512);
63f2d211 SW	231	}
63f2d211 SW	232
31b8006e SW	233	/*
	234	* encoders
	235	*/
c89136ea SW	236	static inline void ceph_encode_64(void **p, u64 v)
	237	{
	238	put_unaligned_le64(v, (__le64 )p);
	239	*p += sizeof(u64);
	240	}
	241	static inline void ceph_encode_32(void **p, u32 v)
	242	{
	243	put_unaligned_le32(v, (__le32 )p);
	244	*p += sizeof(u32);
	245	}
	246	static inline void ceph_encode_16(void **p, u16 v)
	247	{
	248	put_unaligned_le16(v, (__le16 )p);
	249	*p += sizeof(u16);
	250	}
	251	static inline void ceph_encode_8(void **p, u8 v)
	252	{
	253	(u8 )*p = v;
	254	(*p)++;
	255	}
4e7a5dcd SW	256	static inline void ceph_encode_copy(void *p, const void s, int len)
	257	{
	258	memcpy(*p, s, len);
	259	*p += len;
	260	}
31b8006e SW	261
	262	/*
	263	* filepath, string encoders
	264	*/
	265	static inline void ceph_encode_filepath(void *p, void end,
	266	u64 ino, const char *path)
	267	{
	268	u32 len = path ? strlen(path) : 0;
c61a1abd	269	BUG_ON(*p + 1 + sizeof(ino) + sizeof(len) + len > end);
ac8839d7	270	ceph_encode_8(p, 1);
31b8006e SW	271	ceph_encode_64(p, ino);
	272	ceph_encode_32(p, len);
	273	if (len)
	274	memcpy(*p, path, len);
	275	*p += len;
	276	}
	277
	278	static inline void ceph_encode_string(void *p, void end,
	279	const char *s, u32 len)
	280	{
	281	BUG_ON(*p + sizeof(len) + len > end);
	282	ceph_encode_32(p, len);
	283	if (len)
	284	memcpy(*p, s, len);
	285	*p += len;
	286	}
	287
22748f9d ID	288	/*
	289	* version and length starting block encoders/decoders
	290	*/
	291
	292	/* current code version (u8) + compat code version (u8) + len of struct (u32) */
	293	#define CEPH_ENCODING_START_BLK_LEN 6
	294
	295	/**
	296	* ceph_start_encoding - start encoding block
	297	* @struct_v: current (code) version of the encoding
	298	* @struct_compat: oldest code version that can decode it
	299	* @struct_len: length of struct encoding
	300	*/
	301	static inline void ceph_start_encoding(void **p, u8 struct_v, u8 struct_compat,
	302	u32 struct_len)
	303	{
	304	ceph_encode_8(p, struct_v);
	305	ceph_encode_8(p, struct_compat);
	306	ceph_encode_32(p, struct_len);
	307	}
	308
	309	/**
	310	* ceph_start_decoding - start decoding block
	311	* @v: current version of the encoding that the code supports
	312	* @name: name of the struct (free-form)
	313	* @struct_v: out param for the encoding version
	314	* @struct_len: out param for the length of struct encoding
	315	*
	316	* Validates the length of struct encoding, so unsafe ceph_decode_*
	317	* variants can be used for decoding.
	318	*/
	319	static inline int ceph_start_decoding(void *p, void end, u8 v,
	320	const char name, u8 struct_v,
	321	u32 *struct_len)
	322	{
	323	u8 struct_compat;
	324
	325	ceph_decode_need(p, end, CEPH_ENCODING_START_BLK_LEN, bad);
	326	*struct_v = ceph_decode_8(p);
	327	struct_compat = ceph_decode_8(p);
	328	if (v < struct_compat) {
	329	pr_warn("got struct_v %d struct_compat %d > %d of %s\n",
	330	*struct_v, struct_compat, v, name);
	331	return -EINVAL;
	332	}
	333
	334	*struct_len = ceph_decode_32(p);
	335	ceph_decode_need(p, end, *struct_len, bad);
	336	return 0;
	337
	338	bad:
	339	return -ERANGE;
	340	}
	341
dd5f049d AE	342	#define ceph_encode_need(p, end, n, bad) \
	343	do { \
	344	if (!likely(ceph_has_room(p, end, n))) \
	345	goto bad; \
c7e337d6 SW	346	} while (0)
	347
	348	#define ceph_encode_64_safe(p, end, v, bad) \
	349	do { \
	350	ceph_encode_need(p, end, sizeof(u64), bad); \
	351	ceph_encode_64(p, v); \
	352	} while (0)
	353	#define ceph_encode_32_safe(p, end, v, bad) \
	354	do { \
	355	ceph_encode_need(p, end, sizeof(u32), bad); \
dd5f049d	356	ceph_encode_32(p, v); \
c7e337d6 SW	357	} while (0)
	358	#define ceph_encode_16_safe(p, end, v, bad) \
	359	do { \
	360	ceph_encode_need(p, end, sizeof(u16), bad); \
dd5f049d AE	361	ceph_encode_16(p, v); \
	362	} while (0)
	363	#define ceph_encode_8_safe(p, end, v, bad) \
	364	do { \
	365	ceph_encode_need(p, end, sizeof(u8), bad); \
	366	ceph_encode_8(p, v); \
c7e337d6 SW	367	} while (0)
	368
	369	#define ceph_encode_copy_safe(p, end, pv, n, bad) \
	370	do { \
	371	ceph_encode_need(p, end, n, bad); \
	372	ceph_encode_copy(p, pv, n); \
	373	} while (0)
ae1533b6 YS	374	#define ceph_encode_string_safe(p, end, s, n, bad) \
	375	do { \
	376	ceph_encode_need(p, end, n, bad); \
	377	ceph_encode_string(p, end, s, n); \
	378	} while (0)
c7e337d6	379
31b8006e SW	380
31b8006e SW	381	#endif