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ceph: support cephfs' own feature bits

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Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2018-05-11 18:47:29 +08:00 committed by Ilya Dryomov
parent 4de17aea5c
commit 342ce1823e
2 changed files with 51 additions and 9 deletions
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48
fs/ceph/mds_client.c
View file

@ -902,6 +902,27 @@ static struct ceph_msg *create_session_msg(u32 op, u64 seq)
return msg;
}
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);
if (count > 0) {
size_t i;
size_t size = ((size_t)bits[count - 1] + 64) / 64 * 8;
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);
*p += size;
} else {
BUG_ON(*p + 4 > end);
ceph_encode_32(p, 0);
}
}
/*
* session message, specialization for CEPH_SESSION_REQUEST_OPEN
* to include additional client metadata fields.
@ -911,11 +932,11 @@ static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u6
struct ceph_msg *msg;
struct ceph_mds_session_head *h;
int i = -1;
int metadata_bytes = 0;
int extra_bytes = 0;
int metadata_key_count = 0;
struct ceph_options *opt = mdsc->fsc->client->options;
struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
void *p;
void *p, *end;
const char* metadata[][2] = {
{"hostname", mdsc->nodename},
@ -926,21 +947,26 @@ static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u6
};
/* Calculate serialized length of metadata */
metadata_bytes = 4; /* map length */
extra_bytes = 4; /* map length */
for (i = 0; metadata[i][0]; ++i) {
metadata_bytes += 8 + strlen(metadata[i][0]) +
extra_bytes += 8 + strlen(metadata[i][0]) +
strlen(metadata[i][1]);
metadata_key_count++;
}
/* supported feature */
extra_bytes += 4 + 8;
/* Allocate the message */
msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
GFP_NOFS, false);
if (!msg) {
pr_err("create_session_msg ENOMEM creating msg\n");
return NULL;
}
h = msg->front.iov_base;
p = msg->front.iov_base;
end = p + msg->front.iov_len;
h = p;
h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
h->seq = cpu_to_le64(seq);
@ -950,11 +976,11 @@ static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u6
*
* ClientSession messages with metadata are v2
*/
msg->hdr.version = cpu_to_le16(2);
msg->hdr.version = cpu_to_le16(3);
msg->hdr.compat_version = cpu_to_le16(1);
/* The write pointer, following the session_head structure */
p = msg->front.iov_base + sizeof(*h);
p += sizeof(*h);
/* Number of entries in the map */
ceph_encode_32(&p, metadata_key_count);
@ -972,6 +998,10 @@ static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u6
p += val_len;
}
encode_supported_features(&p, end);
msg->front.iov_len = p - msg->front.iov_base;
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
return msg;
}
@ -2749,7 +2779,7 @@ static void handle_session(struct ceph_mds_session *session,
int wake = 0;
/* decode */
if (msg->front.iov_len != sizeof(*h))
if (msg->front.iov_len < sizeof(*h))
goto bad;
op = le32_to_cpu(h->op);
seq = le64_to_cpu(h->seq);

12
fs/ceph/mds_client.h
View file

@ -16,6 +16,18 @@
#include <linux/ceph/mdsmap.h>
#include <linux/ceph/auth.h>
/* The first 8 bits are reserved for old ceph releases */
#define CEPHFS_FEATURE_MIMIC 8
#define CEPHFS_FEATURES_ALL { \
0, 1, 2, 3, 4, 5, 6, 7, \
CEPHFS_FEATURE_MIMIC, \
}
#define CEPHFS_FEATURES_CLIENT_SUPPORTED CEPHFS_FEATURES_ALL
#define CEPHFS_FEATURES_CLIENT_REQUIRED {}
/*
* Some lock dependencies:
*