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libceph: add ceph_decode_entity_addr 

Add a function for decoding an entity_addr_t. Once
CEPH_FEATURE_MSG_ADDR2 is enabled, the server daemons will start
encoding entity_addr_t differently.

Add a new helper function that can handle either format.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton 2019-06-03 14:45:16 -04:00 committed by Ilya Dryomov
parent bc07532cc5
commit 6c37f0e641
3 changed files with 93 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/ceph/decode.h
View File

@ -230,6 +230,8 @@ static inline void ceph_decode_addr(struct ceph_entity_addr *a)
WARN_ON(a->in_addr.ss_family == 512);
}
extern int ceph_decode_entity_addr(void **p, void *end,
struct ceph_entity_addr *addr);
/*
* encoders
*/

2
net/ceph/Makefile
View File

@ -5,7 +5,7 @@
obj-$(CONFIG_CEPH_LIB) += libceph.o
libceph-y := ceph_common.o messenger.o msgpool.o buffer.o pagelist.o \
mon_client.o \
mon_client.o decode.o \
cls_lock_client.o \
osd_client.o osdmap.o crush/crush.o crush/mapper.o crush/hash.o \
striper.o \

90
net/ceph/decode.c Normal file
View File

@ -0,0 +1,90 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/ceph/decode.h>
static int
ceph_decode_entity_addr_versioned(void **p, void *end,
struct ceph_entity_addr *addr)
{
int ret;
u8 struct_v;
u32 struct_len, addr_len;
void *struct_end;
ret = ceph_start_decoding(p, end, 1, "entity_addr_t", &struct_v,
&struct_len);
if (ret)
goto bad;
ret = -EINVAL;
struct_end = *p + struct_len;
ceph_decode_copy_safe(p, end, &addr->type, sizeof(addr->type), bad);
/*
* TYPE_NONE == 0
* TYPE_LEGACY == 1
*
* Clients that don't support ADDR2 always send TYPE_NONE.
* For now, since all we support is msgr1, just set this to 0
* when we get a TYPE_LEGACY type.
*/
if (addr->type == cpu_to_le32(1))
addr->type = 0;
ceph_decode_copy_safe(p, end, &addr->nonce, sizeof(addr->nonce), bad);
ceph_decode_32_safe(p, end, addr_len, bad);
if (addr_len > sizeof(addr->in_addr))
goto bad;
memset(&addr->in_addr, 0, sizeof(addr->in_addr));
if (addr_len) {
ceph_decode_copy_safe(p, end, &addr->in_addr, addr_len, bad);
addr->in_addr.ss_family =
le16_to_cpu((__force __le16)addr->in_addr.ss_family);
}
/* Advance past anything the client doesn't yet understand */
*p = struct_end;
ret = 0;
bad:
return ret;
}
static int
ceph_decode_entity_addr_legacy(void **p, void *end,
struct ceph_entity_addr *addr)
{
int ret = -EINVAL;
/* Skip rest of type field */
ceph_decode_skip_n(p, end, 3, bad);
addr->type = 0;
ceph_decode_copy_safe(p, end, &addr->nonce, sizeof(addr->nonce), bad);
memset(&addr->in_addr, 0, sizeof(addr->in_addr));
ceph_decode_copy_safe(p, end, &addr->in_addr,
sizeof(addr->in_addr), bad);
addr->in_addr.ss_family =
be16_to_cpu((__force __be16)addr->in_addr.ss_family);
ret = 0;
bad:
return ret;
}
int
ceph_decode_entity_addr(void **p, void *end, struct ceph_entity_addr *addr)
{
u8 marker;
ceph_decode_8_safe(p, end, marker, bad);
if (marker == 1)
return ceph_decode_entity_addr_versioned(p, end, addr);
else if (marker == 0)
return ceph_decode_entity_addr_legacy(p, end, addr);
bad:
return -EINVAL;
}
EXPORT_SYMBOL(ceph_decode_entity_addr);