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ceph: allocate the correct amount of extra bytes for the session features 

The total bytes may potentially be larger than 8.

Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2020-01-08 05:17:31 -05:00 committed by Ilya Dryomov
parent 5b3248c677
commit 9ba1e22453
2 changed files with 30 additions and 13 deletions
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20
fs/ceph/mds_client.c
View File

@ -9,6 +9,7 @@
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/ratelimit.h>
#include <linux/bits.h>
#include "super.h"
#include "mds_client.h"
@ -1057,20 +1058,21 @@ static struct ceph_msg *create_session_msg(u32 op, u64 seq)
return msg;
}
static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
#define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
static void encode_supported_features(void **p, void *end)
{
static const unsigned char bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
static const size_t count = ARRAY_SIZE(bits);
static const size_t count = ARRAY_SIZE(feature_bits);
if (count > 0) {
size_t i;
size_t size = ((size_t)bits[count - 1] + 64) / 64 * 8;
size_t size = FEATURE_BYTES(count);
BUG_ON(*p + 4 + size > end);
ceph_encode_32(p, size);
memset(*p, 0, size);
for (i = 0; i < count; i++)
((unsigned char*)(*p))[i / 8] |= 1 << (bits[i] % 8);
((unsigned char*)(*p))[i / 8] |= BIT(feature_bits[i] % 8);
*p += size;
} else {
BUG_ON(*p + 4 > end);
@ -1091,6 +1093,7 @@ static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u6
int metadata_key_count = 0;
struct ceph_options *opt = mdsc->fsc->client->options;
struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
size_t size, count;
void *p, *end;
const char* metadata[][2] = {
@ -1108,8 +1111,13 @@ static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u6
strlen(metadata[i][1]);
metadata_key_count++;
}
/* supported feature */
extra_bytes += 4 + 8;
size = 0;
count = ARRAY_SIZE(feature_bits);
if (count > 0)
size = FEATURE_BYTES(count);
extra_bytes += 4 + size;
/* Allocate the message */
msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
@ -1129,7 +1137,7 @@ static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u6
* Serialize client metadata into waiting buffer space, using
* the format that userspace expects for map<string, string>
*
* ClientSession messages with metadata are v2
* ClientSession messages with metadata are v3
*/
msg->hdr.version = cpu_to_le16(3);
msg->hdr.compat_version = cpu_to_le16(1);

23
fs/ceph/mds_client.h
View File

@ -17,22 +17,31 @@
#include <linux/ceph/auth.h>
/* The first 8 bits are reserved for old ceph releases */
#define CEPHFS_FEATURE_MIMIC 8
#define CEPHFS_FEATURE_REPLY_ENCODING 9
#define CEPHFS_FEATURE_RECLAIM_CLIENT 10
#define CEPHFS_FEATURE_LAZY_CAP_WANTED 11
#define CEPHFS_FEATURE_MULTI_RECONNECT 12
enum ceph_feature_type {
CEPHFS_FEATURE_MIMIC = 8,
CEPHFS_FEATURE_REPLY_ENCODING,
CEPHFS_FEATURE_RECLAIM_CLIENT,
CEPHFS_FEATURE_LAZY_CAP_WANTED,
CEPHFS_FEATURE_MULTI_RECONNECT,
#define CEPHFS_FEATURES_CLIENT_SUPPORTED { \
CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_MULTI_RECONNECT,
};
/*
* This will always have the highest feature bit value
* as the last element of the array.
*/
#define CEPHFS_FEATURES_CLIENT_SUPPORTED { \
0, 1, 2, 3, 4, 5, 6, 7, \
CEPHFS_FEATURE_MIMIC, \
CEPHFS_FEATURE_REPLY_ENCODING, \
CEPHFS_FEATURE_LAZY_CAP_WANTED, \
CEPHFS_FEATURE_MULTI_RECONNECT, \
\
CEPHFS_FEATURE_MAX, \
}
#define CEPHFS_FEATURES_CLIENT_REQUIRED {}
/*
* Some lock dependencies:
*