From c89136ea4253c73e89e97f5138bb22d97ad9f564 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Wed, 14 Oct 2009 09:59:09 -0700
Subject: [PATCH] ceph: convert encode/decode macros to inlines

This avoids the fugly pass by reference and makes the code a bit easier
to read.

Signed-off-by: Sage Weil <sage@newdream.net>
---
 fs/ceph/decode.h     | 129 ++++++++++++++++++++++---------------------
 fs/ceph/mds_client.c |  20 +++----
 fs/ceph/mdsmap.c     |  38 ++++++-------
 fs/ceph/mon_client.c |   4 +-
 fs/ceph/osd_client.c |   8 +--
 fs/ceph/osdmap.c     |  70 +++++++++++------------
 6 files changed, 137 insertions(+), 132 deletions(-)

diff --git a/fs/ceph/decode.h b/fs/ceph/decode.h
index fc2769df062d..91179fb2cc3f 100644
--- a/fs/ceph/decode.h
+++ b/fs/ceph/decode.h
@@ -3,12 +3,44 @@
 
 #include <asm/unaligned.h>
 
+#include "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.
  */
@@ -18,48 +50,20 @@
 			goto bad;			\
 	} while (0)
 
-#define ceph_decode_64(p, v)					\
-	do {							\
-		v = get_unaligned_le64(*(p));			\
-		*(p) += sizeof(u64);				\
-	} while (0)
-#define ceph_decode_32(p, v)					\
-	do {							\
-		v = get_unaligned_le32(*(p));			\
-		*(p) += sizeof(u32);				\
-	} while (0)
-#define ceph_decode_16(p, v)					\
-	do {							\
-		v = get_unaligned_le16(*(p));			\
-		*(p) += sizeof(u16);				\
-	} while (0)
-#define ceph_decode_8(p, v)				\
-	do {						\
-		v = *(u8 *)*(p);			\
-		(*p)++;					\
-	} while (0)
-
-#define ceph_decode_copy(p, pv, n)			\
-	do {						\
-		memcpy(pv, *(p), n);			\
-		*(p) += n;				\
-	} while (0)
-
-/* bounds check too */
 #define ceph_decode_64_safe(p, end, v, bad)			\
 	do {							\
 		ceph_decode_need(p, end, sizeof(u64), bad);	\
-		ceph_decode_64(p, v);				\
+		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);	\
-		ceph_decode_32(p, v);				\
+		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);	\
-		ceph_decode_16(p, v);				\
+		v = ceph_decode_16(p);				\
 	} while (0)
 
 #define ceph_decode_copy_safe(p, end, pv, n, bad)		\
@@ -71,41 +75,42 @@
 /*
  * struct ceph_timespec <-> struct timespec
  */
-#define ceph_decode_timespec(ts, tv)					\
-	do {								\
-		(ts)->tv_sec = le32_to_cpu((tv)->tv_sec);		\
-		(ts)->tv_nsec = le32_to_cpu((tv)->tv_nsec);		\
-	} while (0)
-#define ceph_encode_timespec(tv, ts)				\
-	do {							\
-		(tv)->tv_sec = cpu_to_le32((ts)->tv_sec);	\
-		(tv)->tv_nsec = cpu_to_le32((ts)->tv_nsec);	\
-	} while (0)
-
+static inline void ceph_decode_timespec(struct timespec *ts,
+					struct ceph_timespec *tv)
+{
+	ts->tv_sec = le32_to_cpu(tv->tv_sec);
+	ts->tv_nsec = le32_to_cpu(tv->tv_nsec);
+}
+static inline void ceph_encode_timespec(struct ceph_timespec *tv,
+					struct timespec *ts)
+{
+	tv->tv_sec = cpu_to_le32(ts->tv_sec);
+	tv->tv_nsec = cpu_to_le32(ts->tv_nsec);
+}
 
 /*
  * encoders
  */
-#define ceph_encode_64(p, v)						\
-	do {								\
-		put_unaligned_le64(v, (__le64 *)*(p));			\
-		*(p) += sizeof(u64);					\
-	} while (0)
-#define ceph_encode_32(p, v)					\
-	do {							\
-		put_unaligned_le32(v, (__le32 *)*(p));		\
-		*(p) += sizeof(u32);				\
-	} while (0)
-#define ceph_encode_16(p, v)					\
-	do {							\
-		put_unaligned_le16(v), (__le16 *)*(p));		\
-	*(p) += sizeof(u16);					\
-	} while (0)
-#define ceph_encode_8(p, v)			  \
-	do {					  \
-		*(u8 *)*(p) = v;		  \
-		(*(p))++;			  \
-	} while (0)
+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)++;
+}
 
 /*
  * filepath, string encoders
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index de8ba4a242ca..2b19da31a8b3 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -136,9 +136,9 @@ static int parse_reply_info_dir(void **p, void *end,
 		goto bad;
 
 	ceph_decode_need(p, end, sizeof(num) + 2, bad);
-	ceph_decode_32(p, num);
-	ceph_decode_8(p, info->dir_end);
-	ceph_decode_8(p, info->dir_complete);
+	num = ceph_decode_32(p);
+	info->dir_end = ceph_decode_8(p);
+	info->dir_complete = ceph_decode_8(p);
 	if (num == 0)
 		goto done;
 
@@ -160,7 +160,7 @@ static int parse_reply_info_dir(void **p, void *end,
 	while (num) {
 		/* dentry */
 		ceph_decode_need(p, end, sizeof(u32)*2, bad);
-		ceph_decode_32(p, info->dir_dname_len[i]);
+		info->dir_dname_len[i] = ceph_decode_32(p);
 		ceph_decode_need(p, end, info->dir_dname_len[i], bad);
 		info->dir_dname[i] = *p;
 		*p += info->dir_dname_len[i];
@@ -1791,10 +1791,10 @@ static void handle_forward(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
 	from_mds = le64_to_cpu(msg->hdr.src.name.num);
 
 	ceph_decode_need(&p, end, sizeof(u64)+2*sizeof(u32), bad);
-	ceph_decode_64(&p, tid);
-	ceph_decode_32(&p, next_mds);
-	ceph_decode_32(&p, fwd_seq);
-	ceph_decode_8(&p, must_resend);
+	tid = ceph_decode_64(&p);
+	next_mds = ceph_decode_32(&p);
+	fwd_seq = ceph_decode_32(&p);
+	must_resend = ceph_decode_8(&p);
 
 	WARN_ON(must_resend);  /* shouldn't happen. */
 
@@ -2783,8 +2783,8 @@ void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
 		pr_err("got mdsmap with wrong fsid\n");
 		return;
 	}
-	ceph_decode_32(&p, epoch);
-	ceph_decode_32(&p, maplen);
+	epoch = ceph_decode_32(&p);
+	maplen = ceph_decode_32(&p);
 	dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
 
 	/* do we need it? */
diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
index 09180d8fafe4..80daea064470 100644
--- a/fs/ceph/mdsmap.c
+++ b/fs/ceph/mdsmap.c
@@ -60,21 +60,21 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 	ceph_decode_16_safe(p, end, version, bad);
 
 	ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad);
-	ceph_decode_32(p, m->m_epoch);
-	ceph_decode_32(p, m->m_client_epoch);
-	ceph_decode_32(p, m->m_last_failure);
-	ceph_decode_32(p, m->m_root);
-	ceph_decode_32(p, m->m_session_timeout);
-	ceph_decode_32(p, m->m_session_autoclose);
-	ceph_decode_64(p, m->m_max_file_size);
-	ceph_decode_32(p, m->m_max_mds);
+	m->m_epoch = ceph_decode_32(p);
+	m->m_client_epoch = ceph_decode_32(p);
+	m->m_last_failure = ceph_decode_32(p);
+	m->m_root = ceph_decode_32(p);
+	m->m_session_timeout = ceph_decode_32(p);
+	m->m_session_autoclose = ceph_decode_32(p);
+	m->m_max_file_size = ceph_decode_64(p);
+	m->m_max_mds = ceph_decode_32(p);
 
 	m->m_info = kcalloc(m->m_max_mds, sizeof(*m->m_info), GFP_NOFS);
 	if (m->m_info == NULL)
 		goto badmem;
 
 	/* pick out active nodes from mds_info (state > 0) */
-	ceph_decode_32(p, n);
+	n = ceph_decode_32(p);
 	for (i = 0; i < n; i++) {
 		u32 namelen;
 		s32 mds, inc, state;
@@ -86,18 +86,18 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 
 		ceph_decode_need(p, end, sizeof(addr) + 1 + sizeof(u32), bad);
 		ceph_decode_copy(p, &addr, sizeof(addr));
-		ceph_decode_8(p, infoversion);
-		ceph_decode_32(p, namelen);  /* skip mds name */
+		infoversion = ceph_decode_8(p);
+		namelen = ceph_decode_32(p);  /* skip mds name */
 		*p += namelen;
 
 		ceph_decode_need(p, end,
 				 4*sizeof(u32) + sizeof(u64) +
 				 sizeof(addr) + sizeof(struct ceph_timespec),
 				 bad);
-		ceph_decode_32(p, mds);
-		ceph_decode_32(p, inc);
-		ceph_decode_32(p, state);
-		ceph_decode_64(p, state_seq);
+		mds = ceph_decode_32(p);
+		inc = ceph_decode_32(p);
+		state = ceph_decode_32(p);
+		state_seq = ceph_decode_64(p);
 		*p += sizeof(addr);
 		*p += sizeof(struct ceph_timespec);
 		*p += sizeof(u32);
@@ -123,8 +123,8 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 					kcalloc(num_export_targets, sizeof(u32),
 						GFP_NOFS);
 				for (j = 0; j < num_export_targets; j++)
-					ceph_decode_32(&pexport_targets,
-					      m->m_info[mds].export_targets[j]);
+					m->m_info[mds].export_targets[j] =
+					       ceph_decode_32(&pexport_targets);
 			} else {
 				m->m_info[mds].export_targets = NULL;
 			}
@@ -139,8 +139,8 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 		goto badmem;
 	ceph_decode_need(p, end, sizeof(u32)*(n+1), bad);
 	for (i = 0; i < n; i++)
-		ceph_decode_32(p, m->m_data_pg_pools[i]);
-	ceph_decode_32(p, m->m_cas_pg_pool);
+		m->m_data_pg_pools[i] = ceph_decode_32(p);
+	m->m_cas_pg_pool = ceph_decode_32(p);
 
 	/* ok, we don't care about the rest. */
 	dout("mdsmap_decode success epoch %u\n", m->m_epoch);
diff --git a/fs/ceph/mon_client.c b/fs/ceph/mon_client.c
index d6c8e783467e..bea2be9077e4 100644
--- a/fs/ceph/mon_client.c
+++ b/fs/ceph/mon_client.c
@@ -45,9 +45,9 @@ struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
 
 	ceph_decode_need(&p, end, sizeof(fsid) + 2*sizeof(u32), bad);
 	ceph_decode_copy(&p, &fsid, sizeof(fsid));
-	ceph_decode_32(&p, epoch);
+	epoch = ceph_decode_32(&p);
 
-	ceph_decode_32(&p, num_mon);
+	num_mon = ceph_decode_32(&p);
 	ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad);
 
 	if (num_mon >= CEPH_MAX_MON)
diff --git a/fs/ceph/osd_client.c b/fs/ceph/osd_client.c
index 8e33928647f4..bbd9a5d23712 100644
--- a/fs/ceph/osd_client.c
+++ b/fs/ceph/osd_client.c
@@ -894,8 +894,8 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
 	dout(" %d inc maps\n", nr_maps);
 	while (nr_maps > 0) {
 		ceph_decode_need(&p, end, 2*sizeof(u32), bad);
-		ceph_decode_32(&p, epoch);
-		ceph_decode_32(&p, maplen);
+		epoch = ceph_decode_32(&p);
+		maplen = ceph_decode_32(&p);
 		ceph_decode_need(&p, end, maplen, bad);
 		next = p + maplen;
 		if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
@@ -927,8 +927,8 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
 	dout(" %d full maps\n", nr_maps);
 	while (nr_maps) {
 		ceph_decode_need(&p, end, 2*sizeof(u32), bad);
-		ceph_decode_32(&p, epoch);
-		ceph_decode_32(&p, maplen);
+		epoch = ceph_decode_32(&p);
+		maplen = ceph_decode_32(&p);
 		ceph_decode_need(&p, end, maplen, bad);
 		if (nr_maps > 1) {
 			dout("skipping non-latest full map %u len %d\n",
diff --git a/fs/ceph/osdmap.c b/fs/ceph/osdmap.c
index 342e5f80996b..6f0aeff4185a 100644
--- a/fs/ceph/osdmap.c
+++ b/fs/ceph/osdmap.c
@@ -67,7 +67,7 @@ static int crush_decode_uniform_bucket(void **p, void *end,
 {
 	dout("crush_decode_uniform_bucket %p to %p\n", *p, end);
 	ceph_decode_need(p, end, (1+b->h.size) * sizeof(u32), bad);
-	ceph_decode_32(p, b->item_weight);
+	b->item_weight = ceph_decode_32(p);
 	return 0;
 bad:
 	return -EINVAL;
@@ -86,8 +86,8 @@ static int crush_decode_list_bucket(void **p, void *end,
 		return -ENOMEM;
 	ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
 	for (j = 0; j < b->h.size; j++) {
-		ceph_decode_32(p, b->item_weights[j]);
-		ceph_decode_32(p, b->sum_weights[j]);
+		b->item_weights[j] = ceph_decode_32(p);
+		b->sum_weights[j] = ceph_decode_32(p);
 	}
 	return 0;
 bad:
@@ -105,7 +105,7 @@ static int crush_decode_tree_bucket(void **p, void *end,
 		return -ENOMEM;
 	ceph_decode_need(p, end, b->num_nodes * sizeof(u32), bad);
 	for (j = 0; j < b->num_nodes; j++)
-		ceph_decode_32(p, b->node_weights[j]);
+		b->node_weights[j] = ceph_decode_32(p);
 	return 0;
 bad:
 	return -EINVAL;
@@ -124,8 +124,8 @@ static int crush_decode_straw_bucket(void **p, void *end,
 		return -ENOMEM;
 	ceph_decode_need(p, end, 2 * b->h.size * sizeof(u32), bad);
 	for (j = 0; j < b->h.size; j++) {
-		ceph_decode_32(p, b->item_weights[j]);
-		ceph_decode_32(p, b->straws[j]);
+		b->item_weights[j] = ceph_decode_32(p);
+		b->straws[j] = ceph_decode_32(p);
 	}
 	return 0;
 bad:
@@ -148,15 +148,15 @@ static struct crush_map *crush_decode(void *pbyval, void *end)
 		return ERR_PTR(-ENOMEM);
 
 	ceph_decode_need(p, end, 4*sizeof(u32), bad);
-	ceph_decode_32(p, magic);
+	magic = ceph_decode_32(p);
 	if (magic != CRUSH_MAGIC) {
 		pr_err("crush_decode magic %x != current %x\n",
 		       (unsigned)magic, (unsigned)CRUSH_MAGIC);
 		goto bad;
 	}
-	ceph_decode_32(p, c->max_buckets);
-	ceph_decode_32(p, c->max_rules);
-	ceph_decode_32(p, c->max_devices);
+	c->max_buckets = ceph_decode_32(p);
+	c->max_rules = ceph_decode_32(p);
+	c->max_devices = ceph_decode_32(p);
 
 	c->device_parents = kcalloc(c->max_devices, sizeof(u32), GFP_NOFS);
 	if (c->device_parents == NULL)
@@ -208,11 +208,11 @@ static struct crush_map *crush_decode(void *pbyval, void *end)
 			goto badmem;
 
 		ceph_decode_need(p, end, 4*sizeof(u32), bad);
-		ceph_decode_32(p, b->id);
-		ceph_decode_16(p, b->type);
-		ceph_decode_16(p, b->alg);
-		ceph_decode_32(p, b->weight);
-		ceph_decode_32(p, b->size);
+		b->id = ceph_decode_32(p);
+		b->type = ceph_decode_16(p);
+		b->alg = ceph_decode_16(p);
+		b->weight = ceph_decode_32(p);
+		b->size = ceph_decode_32(p);
 
 		dout("crush_decode bucket size %d off %x %p to %p\n",
 		     b->size, (int)(*p-start), *p, end);
@@ -227,7 +227,7 @@ static struct crush_map *crush_decode(void *pbyval, void *end)
 
 		ceph_decode_need(p, end, b->size*sizeof(u32), bad);
 		for (j = 0; j < b->size; j++)
-			ceph_decode_32(p, b->items[j]);
+			b->items[j] = ceph_decode_32(p);
 
 		switch (b->alg) {
 		case CRUSH_BUCKET_UNIFORM:
@@ -290,9 +290,9 @@ static struct crush_map *crush_decode(void *pbyval, void *end)
 		ceph_decode_copy_safe(p, end, &r->mask, 4, bad); /* 4 u8's */
 		ceph_decode_need(p, end, r->len*3*sizeof(u32), bad);
 		for (j = 0; j < r->len; j++) {
-			ceph_decode_32(p, r->steps[j].op);
-			ceph_decode_32(p, r->steps[j].arg1);
-			ceph_decode_32(p, r->steps[j].arg2);
+			r->steps[j].op = ceph_decode_32(p);
+			r->steps[j].arg1 = ceph_decode_32(p);
+			r->steps[j].arg2 = ceph_decode_32(p);
 		}
 	}
 
@@ -411,11 +411,11 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
 
 	ceph_decode_need(p, end, 2*sizeof(u64)+6*sizeof(u32), bad);
 	ceph_decode_copy(p, &map->fsid, sizeof(map->fsid));
-	ceph_decode_32(p, map->epoch);
+	map->epoch = ceph_decode_32(p);
 	ceph_decode_copy(p, &map->created, sizeof(map->created));
 	ceph_decode_copy(p, &map->modified, sizeof(map->modified));
 
-	ceph_decode_32(p, map->num_pools);
+	map->num_pools = ceph_decode_32(p);
 	map->pg_pool = kcalloc(map->num_pools, sizeof(*map->pg_pool),
 			       GFP_NOFS);
 	if (!map->pg_pool) {
@@ -425,7 +425,7 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
 	ceph_decode_32_safe(p, end, max, bad);
 	while (max--) {
 		ceph_decode_need(p, end, 4+sizeof(map->pg_pool->v), bad);
-		ceph_decode_32(p, i);
+		i = ceph_decode_32(p);
 		if (i >= map->num_pools)
 			goto bad;
 		ceph_decode_copy(p, &map->pg_pool[i].v,
@@ -438,7 +438,7 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
 
 	ceph_decode_32_safe(p, end, map->flags, bad);
 
-	ceph_decode_32(p, max);
+	max = ceph_decode_32(p);
 
 	/* (re)alloc osd arrays */
 	err = osdmap_set_max_osd(map, max);
@@ -456,7 +456,7 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
 
 	*p += 4; /* skip length field (should match max) */
 	for (i = 0; i < map->max_osd; i++)
-		ceph_decode_32(p, map->osd_weight[i]);
+		map->osd_weight[i] = ceph_decode_32(p);
 
 	*p += 4; /* skip length field (should match max) */
 	ceph_decode_copy(p, map->osd_addr, map->max_osd*sizeof(*map->osd_addr));
@@ -469,8 +469,8 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
 		struct ceph_pg_mapping *pg;
 
 		ceph_decode_need(p, end, sizeof(u32) + sizeof(u64), bad);
-		ceph_decode_64(p, pgid);
-		ceph_decode_32(p, n);
+		pgid = ceph_decode_64(p);
+		n = ceph_decode_32(p);
 		ceph_decode_need(p, end, n * sizeof(u32), bad);
 		pg = kmalloc(sizeof(*pg) + n*sizeof(u32), GFP_NOFS);
 		if (!pg) {
@@ -480,7 +480,7 @@ struct ceph_osdmap *osdmap_decode(void **p, void *end)
 		pg->pgid = pgid;
 		pg->len = n;
 		for (j = 0; j < n; j++)
-			ceph_decode_32(p, pg->osds[j]);
+			pg->osds[j] = ceph_decode_32(p);
 
 		err = __insert_pg_mapping(pg, &map->pg_temp);
 		if (err)
@@ -537,10 +537,10 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	ceph_decode_need(p, end, sizeof(fsid)+sizeof(modified)+2*sizeof(u32),
 			 bad);
 	ceph_decode_copy(p, &fsid, sizeof(fsid));
-	ceph_decode_32(p, epoch);
+	epoch = ceph_decode_32(p);
 	BUG_ON(epoch != map->epoch+1);
 	ceph_decode_copy(p, &modified, sizeof(modified));
-	ceph_decode_32(p, new_flags);
+	new_flags = ceph_decode_32(p);
 
 	/* full map? */
 	ceph_decode_32_safe(p, end, len, bad);
@@ -568,7 +568,7 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	ceph_decode_need(p, end, 5*sizeof(u32), bad);
 
 	/* new max? */
-	ceph_decode_32(p, max);
+	max = ceph_decode_32(p);
 	if (max >= 0) {
 		err = osdmap_set_max_osd(map, max);
 		if (err < 0)
@@ -641,8 +641,8 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	while (len--) {
 		u32 osd, off;
 		ceph_decode_need(p, end, sizeof(u32)*2, bad);
-		ceph_decode_32(p, osd);
-		ceph_decode_32(p, off);
+		osd = ceph_decode_32(p);
+		off = ceph_decode_32(p);
 		pr_info("osd%d weight 0x%x %s\n", osd, off,
 		     off == CEPH_OSD_IN ? "(in)" :
 		     (off == CEPH_OSD_OUT ? "(out)" : ""));
@@ -659,8 +659,8 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 		u64 pgid;
 		u32 pglen;
 		ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
-		ceph_decode_64(p, pgid);
-		ceph_decode_32(p, pglen);
+		pgid = ceph_decode_64(p);
+		pglen = ceph_decode_32(p);
 
 		/* remove any? */
 		while (rbp && rb_entry(rbp, struct ceph_pg_mapping,
@@ -683,7 +683,7 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 			pg->pgid = pgid;
 			pg->len = pglen;
 			for (j = 0; j < len; j++)
-				ceph_decode_32(p, pg->osds[j]);
+				pg->osds[j] = ceph_decode_32(p);
 			err = __insert_pg_mapping(pg, &map->pg_temp);
 			if (err)
 				goto bad;