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authorYan, Zheng <zyan@redhat.com>2018-12-21 17:41:39 +0800
committerIlya Dryomov <idryomov@gmail.com>2019-03-05 18:55:16 +0100
commit84bf39509bea5b9f936281c4c660e75099fcd15f (patch)
tree399778e7d6d668af74aa31915b4a3962e1ec64ff /fs/ceph
parent5ba72e607cdb3ceebbc6ba4772b79e7e96b55cc4 (diff)
downloadlinux-stericsson-84bf39509bea5b9f936281c4c660e75099fcd15f.tar.gz
ceph: decode feature bits in session message
Signed-off-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/mds_client.c46
-rw-r--r--fs/ceph/mds_client.h3
2 files changed, 44 insertions, 5 deletions
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 163fc74bf221..04f18095e306 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2777,6 +2777,25 @@ bad:
pr_err("mdsc_handle_forward decode error err=%d\n", err);
}
+static int __decode_and_drop_session_metadata(void **p, void *end)
+{
+ /* map<string,string> */
+ u32 n;
+ ceph_decode_32_safe(p, end, n, bad);
+ while (n-- > 0) {
+ u32 len;
+ ceph_decode_32_safe(p, end, len, bad);
+ ceph_decode_need(p, end, len, bad);
+ *p += len;
+ ceph_decode_32_safe(p, end, len, bad);
+ ceph_decode_need(p, end, len, bad);
+ *p += len;
+ }
+ return 0;
+bad:
+ return -1;
+}
+
/*
* handle a mds session control message
*/
@@ -2784,18 +2803,36 @@ static void handle_session(struct ceph_mds_session *session,
struct ceph_msg *msg)
{
struct ceph_mds_client *mdsc = session->s_mdsc;
+ int mds = session->s_mds;
+ int msg_version = le16_to_cpu(msg->hdr.version);
+ void *p = msg->front.iov_base;
+ void *end = p + msg->front.iov_len;
+ struct ceph_mds_session_head *h;
u32 op;
u64 seq;
- int mds = session->s_mds;
- struct ceph_mds_session_head *h = msg->front.iov_base;
+ unsigned long features = 0;
int wake = 0;
/* decode */
- if (msg->front.iov_len < sizeof(*h))
- goto bad;
+ ceph_decode_need(&p, end, sizeof(*h), bad);
+ h = p;
+ p += sizeof(*h);
+
op = le32_to_cpu(h->op);
seq = le64_to_cpu(h->seq);
+ if (msg_version >= 3) {
+ u32 len;
+ /* version >= 2, metadata */
+ if (__decode_and_drop_session_metadata(&p, end) < 0)
+ goto bad;
+ /* version >= 3, feature bits */
+ ceph_decode_32_safe(&p, end, len, bad);
+ ceph_decode_need(&p, end, len, bad);
+ memcpy(&features, p, min_t(size_t, len, sizeof(features)));
+ p += len;
+ }
+
mutex_lock(&mdsc->mutex);
if (op == CEPH_SESSION_CLOSE) {
get_session(session);
@@ -2821,6 +2858,7 @@ static void handle_session(struct ceph_mds_session *session,
if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
pr_info("mds%d reconnect success\n", session->s_mds);
session->s_state = CEPH_MDS_SESSION_OPEN;
+ session->s_features = features;
renewed_caps(mdsc, session, 0);
wake = 1;
if (mdsc->stopping)
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 729da155ebf0..0d3264cf3334 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -152,6 +152,7 @@ struct ceph_mds_session {
int s_mds;
int s_state;
unsigned long s_ttl; /* time until mds kills us */
+ unsigned long s_features;
u64 s_seq; /* incoming msg seq # */
struct mutex s_mutex; /* serialize session messages */
@@ -179,7 +180,7 @@ struct ceph_mds_session {
unsigned long s_renew_requested; /* last time we sent a renew req */
u64 s_renew_seq;
- refcount_t s_ref;
+ refcount_t s_ref;
struct list_head s_waiting; /* waiting requests */
struct list_head s_unsafe; /* unsafe requests */
};