From 737cc81ead34bcef0b1f6ea8322228e4378cf21a Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <idryomov@gmail.com>
Date: Thu, 26 May 2016 00:05:01 +0200
Subject: [PATCH] libceph: support for subscribing to "mdsmap.<id>" maps
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---
include/linux/ceph/ceph_fs.h | 2 ++
include/linux/ceph/mon_client.h | 1 +
net/ceph/debugfs.c | 1 +
net/ceph/mon_client.c | 18 +++++++++++++-----
4 files changed, 17 insertions(+), 5 deletions(-)
diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h
index 3b911ff889dd..bae833d0d055 100644
--- a/include/linux/ceph/ceph_fs.h
+++ b/include/linux/ceph/ceph_fs.h
@@ -208,6 +208,8 @@ struct ceph_mon_subscribe_ack {
struct ceph_fsid fsid;
} __attribute__ ((packed));
+#define CEPH_FS_CLUSTER_ID_NONE -1
+
/*
* mdsmap flags
*/
diff --git a/include/linux/ceph/mon_client.h b/include/linux/ceph/mon_client.h
index 1d730993c3f8..e2a92df08b47 100644
--- a/include/linux/ceph/mon_client.h
+++ b/include/linux/ceph/mon_client.h
@@ -96,6 +96,7 @@ struct ceph_mon_client {
bool want;
u32 have; /* epoch */
} subs[3];
+ int fs_cluster_id; /* "mdsmap.<id>" sub */
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs_file;
diff --git a/net/ceph/debugfs.c b/net/ceph/debugfs.c
index 6e434c75cd08..e77b04ca7802 100644
--- a/net/ceph/debugfs.c
+++ b/net/ceph/debugfs.c
@@ -128,6 +128,7 @@ static int monc_show(struct seq_file *s, void *p)
CEPH_SUBSCRIBE_ONETIME ? "" : "+"));
seq_putc(s, '\n');
}
+ seq_printf(s, "fs_cluster_id %d\n", monc->fs_cluster_id);
for (rp = rb_first(&monc->generic_request_tree); rp; rp = rb_next(rp)) {
__u16 op;
diff --git a/net/ceph/mon_client.c b/net/ceph/mon_client.c
index 72a910bf7819..37c38a7fb5c5 100644
--- a/net/ceph/mon_client.c
+++ b/net/ceph/mon_client.c
@@ -260,20 +260,26 @@ static void __send_subscribe(struct ceph_mon_client *monc)
BUG_ON(num < 1); /* monmap sub is always there */
ceph_encode_32(&p, num);
for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
- const char *s = ceph_sub_str[i];
+ char buf[32];
+ int len;
if (!monc->subs[i].want)
continue;
- dout("%s %s start %llu flags 0x%x\n", __func__, s,
+ len = sprintf(buf, "%s", ceph_sub_str[i]);
+ if (i == CEPH_SUB_MDSMAP &&
+ monc->fs_cluster_id != CEPH_FS_CLUSTER_ID_NONE)
+ len += sprintf(buf + len, ".%d", monc->fs_cluster_id);
+
+ dout("%s %s start %llu flags 0x%x\n", __func__, buf,
le64_to_cpu(monc->subs[i].item.start),
monc->subs[i].item.flags);
- ceph_encode_string(&p, end, s, strlen(s));
+ ceph_encode_string(&p, end, buf, len);
memcpy(p, &monc->subs[i].item, sizeof(monc->subs[i].item));
p += sizeof(monc->subs[i].item);
}
- BUG_ON(p != (end - 35 - (ARRAY_SIZE(monc->subs) - num) * 19));
+ BUG_ON(p > end);
msg->front.iov_len = p - msg->front.iov_base;
msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
ceph_msg_revoke(msg);
@@ -948,7 +954,7 @@ int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
if (!monc->m_subscribe_ack)
goto out_auth;
- monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS,
+ monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 128, GFP_NOFS,
true);
if (!monc->m_subscribe)
goto out_subscribe_ack;
@@ -974,6 +980,8 @@ int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
monc->generic_request_tree = RB_ROOT;
monc->last_tid = 0;
+ monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE;
+
return 0;
out_auth_reply: