f646912d10
Signed-off-by: Ilya Dryomov <idryomov@redhat.com>
1122 lines
27 KiB
C
1122 lines
27 KiB
C
#include <linux/ceph/ceph_debug.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/sched.h>
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#include <linux/ceph/mon_client.h>
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#include <linux/ceph/libceph.h>
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#include <linux/ceph/debugfs.h>
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#include <linux/ceph/decode.h>
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#include <linux/ceph/auth.h>
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/*
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* Interact with Ceph monitor cluster. Handle requests for new map
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* versions, and periodically resend as needed. Also implement
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* statfs() and umount().
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*
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* A small cluster of Ceph "monitors" are responsible for managing critical
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* cluster configuration and state information. An odd number (e.g., 3, 5)
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* of cmon daemons use a modified version of the Paxos part-time parliament
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* algorithm to manage the MDS map (mds cluster membership), OSD map, and
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* list of clients who have mounted the file system.
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*
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* We maintain an open, active session with a monitor at all times in order to
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* receive timely MDSMap updates. We periodically send a keepalive byte on the
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* TCP socket to ensure we detect a failure. If the connection does break, we
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* randomly hunt for a new monitor. Once the connection is reestablished, we
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* resend any outstanding requests.
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*/
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static const struct ceph_connection_operations mon_con_ops;
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static int __validate_auth(struct ceph_mon_client *monc);
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/*
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* Decode a monmap blob (e.g., during mount).
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*/
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struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
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{
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struct ceph_monmap *m = NULL;
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int i, err = -EINVAL;
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struct ceph_fsid fsid;
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u32 epoch, num_mon;
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u16 version;
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u32 len;
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ceph_decode_32_safe(&p, end, len, bad);
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ceph_decode_need(&p, end, len, bad);
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dout("monmap_decode %p %p len %d\n", p, end, (int)(end-p));
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ceph_decode_16_safe(&p, end, version, bad);
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ceph_decode_need(&p, end, sizeof(fsid) + 2*sizeof(u32), bad);
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ceph_decode_copy(&p, &fsid, sizeof(fsid));
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epoch = ceph_decode_32(&p);
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num_mon = ceph_decode_32(&p);
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ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad);
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if (num_mon >= CEPH_MAX_MON)
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goto bad;
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m = kmalloc(sizeof(*m) + sizeof(m->mon_inst[0])*num_mon, GFP_NOFS);
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if (m == NULL)
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return ERR_PTR(-ENOMEM);
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m->fsid = fsid;
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m->epoch = epoch;
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m->num_mon = num_mon;
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ceph_decode_copy(&p, m->mon_inst, num_mon*sizeof(m->mon_inst[0]));
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for (i = 0; i < num_mon; i++)
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ceph_decode_addr(&m->mon_inst[i].addr);
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dout("monmap_decode epoch %d, num_mon %d\n", m->epoch,
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m->num_mon);
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for (i = 0; i < m->num_mon; i++)
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dout("monmap_decode mon%d is %s\n", i,
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ceph_pr_addr(&m->mon_inst[i].addr.in_addr));
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return m;
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bad:
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dout("monmap_decode failed with %d\n", err);
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kfree(m);
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return ERR_PTR(err);
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}
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/*
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* return true if *addr is included in the monmap.
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*/
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int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr)
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{
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int i;
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for (i = 0; i < m->num_mon; i++)
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if (memcmp(addr, &m->mon_inst[i].addr, sizeof(*addr)) == 0)
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return 1;
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return 0;
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}
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/*
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* Send an auth request.
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*/
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static void __send_prepared_auth_request(struct ceph_mon_client *monc, int len)
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{
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monc->pending_auth = 1;
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monc->m_auth->front.iov_len = len;
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monc->m_auth->hdr.front_len = cpu_to_le32(len);
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ceph_msg_revoke(monc->m_auth);
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ceph_msg_get(monc->m_auth); /* keep our ref */
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ceph_con_send(&monc->con, monc->m_auth);
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}
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/*
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* Close monitor session, if any.
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*/
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static void __close_session(struct ceph_mon_client *monc)
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{
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dout("__close_session closing mon%d\n", monc->cur_mon);
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ceph_msg_revoke(monc->m_auth);
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ceph_msg_revoke_incoming(monc->m_auth_reply);
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ceph_msg_revoke(monc->m_subscribe);
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ceph_msg_revoke_incoming(monc->m_subscribe_ack);
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ceph_con_close(&monc->con);
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monc->cur_mon = -1;
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monc->pending_auth = 0;
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ceph_auth_reset(monc->auth);
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}
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/*
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* Open a session with a (new) monitor.
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*/
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static int __open_session(struct ceph_mon_client *monc)
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{
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char r;
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int ret;
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if (monc->cur_mon < 0) {
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get_random_bytes(&r, 1);
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monc->cur_mon = r % monc->monmap->num_mon;
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dout("open_session num=%d r=%d -> mon%d\n",
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monc->monmap->num_mon, r, monc->cur_mon);
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monc->sub_sent = 0;
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monc->sub_renew_after = jiffies; /* i.e., expired */
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monc->want_next_osdmap = !!monc->want_next_osdmap;
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dout("open_session mon%d opening\n", monc->cur_mon);
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ceph_con_open(&monc->con,
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CEPH_ENTITY_TYPE_MON, monc->cur_mon,
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&monc->monmap->mon_inst[monc->cur_mon].addr);
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/* initiatiate authentication handshake */
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ret = ceph_auth_build_hello(monc->auth,
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monc->m_auth->front.iov_base,
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monc->m_auth->front_alloc_len);
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__send_prepared_auth_request(monc, ret);
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} else {
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dout("open_session mon%d already open\n", monc->cur_mon);
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}
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return 0;
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}
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static bool __sub_expired(struct ceph_mon_client *monc)
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{
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return time_after_eq(jiffies, monc->sub_renew_after);
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}
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/*
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* Reschedule delayed work timer.
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*/
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static void __schedule_delayed(struct ceph_mon_client *monc)
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{
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unsigned int delay;
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if (monc->cur_mon < 0 || __sub_expired(monc))
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delay = 10 * HZ;
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else
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delay = 20 * HZ;
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dout("__schedule_delayed after %u\n", delay);
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schedule_delayed_work(&monc->delayed_work, delay);
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}
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/*
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* Send subscribe request for mdsmap and/or osdmap.
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*/
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static void __send_subscribe(struct ceph_mon_client *monc)
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{
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dout("__send_subscribe sub_sent=%u exp=%u want_osd=%d\n",
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(unsigned int)monc->sub_sent, __sub_expired(monc),
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monc->want_next_osdmap);
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if ((__sub_expired(monc) && !monc->sub_sent) ||
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monc->want_next_osdmap == 1) {
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struct ceph_msg *msg = monc->m_subscribe;
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struct ceph_mon_subscribe_item *i;
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void *p, *end;
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int num;
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p = msg->front.iov_base;
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end = p + msg->front_alloc_len;
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num = 1 + !!monc->want_next_osdmap + !!monc->want_mdsmap;
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ceph_encode_32(&p, num);
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if (monc->want_next_osdmap) {
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dout("__send_subscribe to 'osdmap' %u\n",
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(unsigned int)monc->have_osdmap);
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ceph_encode_string(&p, end, "osdmap", 6);
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i = p;
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i->have = cpu_to_le64(monc->have_osdmap);
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i->onetime = 1;
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p += sizeof(*i);
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monc->want_next_osdmap = 2; /* requested */
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}
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if (monc->want_mdsmap) {
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dout("__send_subscribe to 'mdsmap' %u+\n",
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(unsigned int)monc->have_mdsmap);
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ceph_encode_string(&p, end, "mdsmap", 6);
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i = p;
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i->have = cpu_to_le64(monc->have_mdsmap);
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i->onetime = 0;
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p += sizeof(*i);
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}
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ceph_encode_string(&p, end, "monmap", 6);
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i = p;
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i->have = 0;
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i->onetime = 0;
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p += sizeof(*i);
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msg->front.iov_len = p - msg->front.iov_base;
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msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
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ceph_msg_revoke(msg);
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ceph_con_send(&monc->con, ceph_msg_get(msg));
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monc->sub_sent = jiffies | 1; /* never 0 */
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}
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}
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static void handle_subscribe_ack(struct ceph_mon_client *monc,
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struct ceph_msg *msg)
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{
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unsigned int seconds;
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struct ceph_mon_subscribe_ack *h = msg->front.iov_base;
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if (msg->front.iov_len < sizeof(*h))
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goto bad;
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seconds = le32_to_cpu(h->duration);
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mutex_lock(&monc->mutex);
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if (monc->hunting) {
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pr_info("mon%d %s session established\n",
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monc->cur_mon,
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ceph_pr_addr(&monc->con.peer_addr.in_addr));
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monc->hunting = false;
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}
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dout("handle_subscribe_ack after %d seconds\n", seconds);
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monc->sub_renew_after = monc->sub_sent + (seconds >> 1)*HZ - 1;
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monc->sub_sent = 0;
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mutex_unlock(&monc->mutex);
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return;
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bad:
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pr_err("got corrupt subscribe-ack msg\n");
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ceph_msg_dump(msg);
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}
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/*
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* Keep track of which maps we have
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*/
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int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 got)
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{
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mutex_lock(&monc->mutex);
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monc->have_mdsmap = got;
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mutex_unlock(&monc->mutex);
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return 0;
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}
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EXPORT_SYMBOL(ceph_monc_got_mdsmap);
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int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 got)
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{
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mutex_lock(&monc->mutex);
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monc->have_osdmap = got;
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monc->want_next_osdmap = 0;
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mutex_unlock(&monc->mutex);
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return 0;
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}
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/*
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* Register interest in the next osdmap
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*/
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void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc)
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{
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dout("request_next_osdmap have %u\n", monc->have_osdmap);
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mutex_lock(&monc->mutex);
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if (!monc->want_next_osdmap)
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monc->want_next_osdmap = 1;
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if (monc->want_next_osdmap < 2)
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__send_subscribe(monc);
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mutex_unlock(&monc->mutex);
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}
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EXPORT_SYMBOL(ceph_monc_request_next_osdmap);
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int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
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unsigned long timeout)
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{
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unsigned long started = jiffies;
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int ret;
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mutex_lock(&monc->mutex);
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while (monc->have_osdmap < epoch) {
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mutex_unlock(&monc->mutex);
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if (timeout != 0 && time_after_eq(jiffies, started + timeout))
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return -ETIMEDOUT;
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ret = wait_event_interruptible_timeout(monc->client->auth_wq,
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monc->have_osdmap >= epoch, timeout);
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if (ret < 0)
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return ret;
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mutex_lock(&monc->mutex);
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}
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mutex_unlock(&monc->mutex);
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return 0;
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}
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EXPORT_SYMBOL(ceph_monc_wait_osdmap);
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/*
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*
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*/
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int ceph_monc_open_session(struct ceph_mon_client *monc)
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{
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mutex_lock(&monc->mutex);
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__open_session(monc);
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__schedule_delayed(monc);
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mutex_unlock(&monc->mutex);
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return 0;
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}
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EXPORT_SYMBOL(ceph_monc_open_session);
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/*
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* We require the fsid and global_id in order to initialize our
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* debugfs dir.
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*/
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static bool have_debugfs_info(struct ceph_mon_client *monc)
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{
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dout("have_debugfs_info fsid %d globalid %lld\n",
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(int)monc->client->have_fsid, monc->auth->global_id);
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return monc->client->have_fsid && monc->auth->global_id > 0;
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}
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/*
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* The monitor responds with mount ack indicate mount success. The
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* included client ticket allows the client to talk to MDSs and OSDs.
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*/
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static void ceph_monc_handle_map(struct ceph_mon_client *monc,
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struct ceph_msg *msg)
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{
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struct ceph_client *client = monc->client;
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struct ceph_monmap *monmap = NULL, *old = monc->monmap;
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void *p, *end;
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int had_debugfs_info, init_debugfs = 0;
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mutex_lock(&monc->mutex);
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had_debugfs_info = have_debugfs_info(monc);
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dout("handle_monmap\n");
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p = msg->front.iov_base;
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end = p + msg->front.iov_len;
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monmap = ceph_monmap_decode(p, end);
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if (IS_ERR(monmap)) {
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pr_err("problem decoding monmap, %d\n",
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(int)PTR_ERR(monmap));
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goto out;
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}
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if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) {
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kfree(monmap);
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goto out;
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}
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client->monc.monmap = monmap;
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kfree(old);
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if (!client->have_fsid) {
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client->have_fsid = true;
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if (!had_debugfs_info && have_debugfs_info(monc)) {
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pr_info("client%lld fsid %pU\n",
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ceph_client_id(monc->client),
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&monc->client->fsid);
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init_debugfs = 1;
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}
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mutex_unlock(&monc->mutex);
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if (init_debugfs) {
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/*
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* do debugfs initialization without mutex to avoid
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* creating a locking dependency
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*/
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ceph_debugfs_client_init(monc->client);
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}
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goto out_unlocked;
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}
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out:
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mutex_unlock(&monc->mutex);
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out_unlocked:
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wake_up_all(&client->auth_wq);
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}
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/*
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* generic requests (currently statfs, mon_get_version)
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*/
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static struct ceph_mon_generic_request *__lookup_generic_req(
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struct ceph_mon_client *monc, u64 tid)
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{
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struct ceph_mon_generic_request *req;
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struct rb_node *n = monc->generic_request_tree.rb_node;
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while (n) {
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req = rb_entry(n, struct ceph_mon_generic_request, node);
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if (tid < req->tid)
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n = n->rb_left;
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else if (tid > req->tid)
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n = n->rb_right;
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else
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return req;
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}
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return NULL;
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}
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|
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static void __insert_generic_request(struct ceph_mon_client *monc,
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struct ceph_mon_generic_request *new)
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{
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struct rb_node **p = &monc->generic_request_tree.rb_node;
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struct rb_node *parent = NULL;
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struct ceph_mon_generic_request *req = NULL;
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while (*p) {
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parent = *p;
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req = rb_entry(parent, struct ceph_mon_generic_request, node);
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if (new->tid < req->tid)
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p = &(*p)->rb_left;
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else if (new->tid > req->tid)
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p = &(*p)->rb_right;
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else
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BUG();
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}
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rb_link_node(&new->node, parent, p);
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rb_insert_color(&new->node, &monc->generic_request_tree);
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}
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static void release_generic_request(struct kref *kref)
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{
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struct ceph_mon_generic_request *req =
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container_of(kref, struct ceph_mon_generic_request, kref);
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if (req->reply)
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ceph_msg_put(req->reply);
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if (req->request)
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ceph_msg_put(req->request);
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kfree(req);
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}
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static void put_generic_request(struct ceph_mon_generic_request *req)
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{
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kref_put(&req->kref, release_generic_request);
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}
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static void get_generic_request(struct ceph_mon_generic_request *req)
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{
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kref_get(&req->kref);
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}
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|
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static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
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struct ceph_msg_header *hdr,
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int *skip)
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{
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struct ceph_mon_client *monc = con->private;
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struct ceph_mon_generic_request *req;
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u64 tid = le64_to_cpu(hdr->tid);
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struct ceph_msg *m;
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|
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mutex_lock(&monc->mutex);
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req = __lookup_generic_req(monc, tid);
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if (!req) {
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dout("get_generic_reply %lld dne\n", tid);
|
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*skip = 1;
|
|
m = NULL;
|
|
} else {
|
|
dout("get_generic_reply %lld got %p\n", tid, req->reply);
|
|
*skip = 0;
|
|
m = ceph_msg_get(req->reply);
|
|
/*
|
|
* we don't need to track the connection reading into
|
|
* this reply because we only have one open connection
|
|
* at a time, ever.
|
|
*/
|
|
}
|
|
mutex_unlock(&monc->mutex);
|
|
return m;
|
|
}
|
|
|
|
static int __do_generic_request(struct ceph_mon_client *monc, u64 tid,
|
|
struct ceph_mon_generic_request *req)
|
|
{
|
|
int err;
|
|
|
|
/* register request */
|
|
req->tid = tid != 0 ? tid : ++monc->last_tid;
|
|
req->request->hdr.tid = cpu_to_le64(req->tid);
|
|
__insert_generic_request(monc, req);
|
|
monc->num_generic_requests++;
|
|
ceph_con_send(&monc->con, ceph_msg_get(req->request));
|
|
mutex_unlock(&monc->mutex);
|
|
|
|
err = wait_for_completion_interruptible(&req->completion);
|
|
|
|
mutex_lock(&monc->mutex);
|
|
rb_erase(&req->node, &monc->generic_request_tree);
|
|
monc->num_generic_requests--;
|
|
|
|
if (!err)
|
|
err = req->result;
|
|
return err;
|
|
}
|
|
|
|
static int do_generic_request(struct ceph_mon_client *monc,
|
|
struct ceph_mon_generic_request *req)
|
|
{
|
|
int err;
|
|
|
|
mutex_lock(&monc->mutex);
|
|
err = __do_generic_request(monc, 0, req);
|
|
mutex_unlock(&monc->mutex);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* statfs
|
|
*/
|
|
static void handle_statfs_reply(struct ceph_mon_client *monc,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
|
|
u64 tid = le64_to_cpu(msg->hdr.tid);
|
|
|
|
if (msg->front.iov_len != sizeof(*reply))
|
|
goto bad;
|
|
dout("handle_statfs_reply %p tid %llu\n", msg, tid);
|
|
|
|
mutex_lock(&monc->mutex);
|
|
req = __lookup_generic_req(monc, tid);
|
|
if (req) {
|
|
*(struct ceph_statfs *)req->buf = reply->st;
|
|
req->result = 0;
|
|
get_generic_request(req);
|
|
}
|
|
mutex_unlock(&monc->mutex);
|
|
if (req) {
|
|
complete_all(&req->completion);
|
|
put_generic_request(req);
|
|
}
|
|
return;
|
|
|
|
bad:
|
|
pr_err("corrupt statfs reply, tid %llu\n", tid);
|
|
ceph_msg_dump(msg);
|
|
}
|
|
|
|
/*
|
|
* Do a synchronous statfs().
|
|
*/
|
|
int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
struct ceph_mon_statfs *h;
|
|
int err;
|
|
|
|
req = kzalloc(sizeof(*req), GFP_NOFS);
|
|
if (!req)
|
|
return -ENOMEM;
|
|
|
|
kref_init(&req->kref);
|
|
req->buf = buf;
|
|
init_completion(&req->completion);
|
|
|
|
err = -ENOMEM;
|
|
req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS,
|
|
true);
|
|
if (!req->request)
|
|
goto out;
|
|
req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS,
|
|
true);
|
|
if (!req->reply)
|
|
goto out;
|
|
|
|
/* fill out request */
|
|
h = req->request->front.iov_base;
|
|
h->monhdr.have_version = 0;
|
|
h->monhdr.session_mon = cpu_to_le16(-1);
|
|
h->monhdr.session_mon_tid = 0;
|
|
h->fsid = monc->monmap->fsid;
|
|
|
|
err = do_generic_request(monc, req);
|
|
|
|
out:
|
|
put_generic_request(req);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ceph_monc_do_statfs);
|
|
|
|
static void handle_get_version_reply(struct ceph_mon_client *monc,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
u64 tid = le64_to_cpu(msg->hdr.tid);
|
|
void *p = msg->front.iov_base;
|
|
void *end = p + msg->front_alloc_len;
|
|
u64 handle;
|
|
|
|
dout("%s %p tid %llu\n", __func__, msg, tid);
|
|
|
|
ceph_decode_need(&p, end, 2*sizeof(u64), bad);
|
|
handle = ceph_decode_64(&p);
|
|
if (tid != 0 && tid != handle)
|
|
goto bad;
|
|
|
|
mutex_lock(&monc->mutex);
|
|
req = __lookup_generic_req(monc, handle);
|
|
if (req) {
|
|
*(u64 *)req->buf = ceph_decode_64(&p);
|
|
req->result = 0;
|
|
get_generic_request(req);
|
|
}
|
|
mutex_unlock(&monc->mutex);
|
|
if (req) {
|
|
complete_all(&req->completion);
|
|
put_generic_request(req);
|
|
}
|
|
|
|
return;
|
|
bad:
|
|
pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
|
|
ceph_msg_dump(msg);
|
|
}
|
|
|
|
/*
|
|
* Send MMonGetVersion and wait for the reply.
|
|
*
|
|
* @what: one of "mdsmap", "osdmap" or "monmap"
|
|
*/
|
|
int ceph_monc_do_get_version(struct ceph_mon_client *monc, const char *what,
|
|
u64 *newest)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
void *p, *end;
|
|
u64 tid;
|
|
int err;
|
|
|
|
req = kzalloc(sizeof(*req), GFP_NOFS);
|
|
if (!req)
|
|
return -ENOMEM;
|
|
|
|
kref_init(&req->kref);
|
|
req->buf = newest;
|
|
init_completion(&req->completion);
|
|
|
|
req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
|
|
sizeof(u64) + sizeof(u32) + strlen(what),
|
|
GFP_NOFS, true);
|
|
if (!req->request) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 1024,
|
|
GFP_NOFS, true);
|
|
if (!req->reply) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
p = req->request->front.iov_base;
|
|
end = p + req->request->front_alloc_len;
|
|
|
|
/* fill out request */
|
|
mutex_lock(&monc->mutex);
|
|
tid = ++monc->last_tid;
|
|
ceph_encode_64(&p, tid); /* handle */
|
|
ceph_encode_string(&p, end, what, strlen(what));
|
|
|
|
err = __do_generic_request(monc, tid, req);
|
|
|
|
mutex_unlock(&monc->mutex);
|
|
out:
|
|
put_generic_request(req);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ceph_monc_do_get_version);
|
|
|
|
/*
|
|
* Resend pending generic requests.
|
|
*/
|
|
static void __resend_generic_request(struct ceph_mon_client *monc)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
struct rb_node *p;
|
|
|
|
for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) {
|
|
req = rb_entry(p, struct ceph_mon_generic_request, node);
|
|
ceph_msg_revoke(req->request);
|
|
ceph_msg_revoke_incoming(req->reply);
|
|
ceph_con_send(&monc->con, ceph_msg_get(req->request));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Delayed work. If we haven't mounted yet, retry. Otherwise,
|
|
* renew/retry subscription as needed (in case it is timing out, or we
|
|
* got an ENOMEM). And keep the monitor connection alive.
|
|
*/
|
|
static void delayed_work(struct work_struct *work)
|
|
{
|
|
struct ceph_mon_client *monc =
|
|
container_of(work, struct ceph_mon_client, delayed_work.work);
|
|
|
|
dout("monc delayed_work\n");
|
|
mutex_lock(&monc->mutex);
|
|
if (monc->hunting) {
|
|
__close_session(monc);
|
|
__open_session(monc); /* continue hunting */
|
|
} else {
|
|
ceph_con_keepalive(&monc->con);
|
|
|
|
__validate_auth(monc);
|
|
|
|
if (ceph_auth_is_authenticated(monc->auth))
|
|
__send_subscribe(monc);
|
|
}
|
|
__schedule_delayed(monc);
|
|
mutex_unlock(&monc->mutex);
|
|
}
|
|
|
|
/*
|
|
* On startup, we build a temporary monmap populated with the IPs
|
|
* provided by mount(2).
|
|
*/
|
|
static int build_initial_monmap(struct ceph_mon_client *monc)
|
|
{
|
|
struct ceph_options *opt = monc->client->options;
|
|
struct ceph_entity_addr *mon_addr = opt->mon_addr;
|
|
int num_mon = opt->num_mon;
|
|
int i;
|
|
|
|
/* build initial monmap */
|
|
monc->monmap = kzalloc(sizeof(*monc->monmap) +
|
|
num_mon*sizeof(monc->monmap->mon_inst[0]),
|
|
GFP_KERNEL);
|
|
if (!monc->monmap)
|
|
return -ENOMEM;
|
|
for (i = 0; i < num_mon; i++) {
|
|
monc->monmap->mon_inst[i].addr = mon_addr[i];
|
|
monc->monmap->mon_inst[i].addr.nonce = 0;
|
|
monc->monmap->mon_inst[i].name.type =
|
|
CEPH_ENTITY_TYPE_MON;
|
|
monc->monmap->mon_inst[i].name.num = cpu_to_le64(i);
|
|
}
|
|
monc->monmap->num_mon = num_mon;
|
|
return 0;
|
|
}
|
|
|
|
int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl)
|
|
{
|
|
int err = 0;
|
|
|
|
dout("init\n");
|
|
memset(monc, 0, sizeof(*monc));
|
|
monc->client = cl;
|
|
monc->monmap = NULL;
|
|
mutex_init(&monc->mutex);
|
|
|
|
err = build_initial_monmap(monc);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* connection */
|
|
/* authentication */
|
|
monc->auth = ceph_auth_init(cl->options->name,
|
|
cl->options->key);
|
|
if (IS_ERR(monc->auth)) {
|
|
err = PTR_ERR(monc->auth);
|
|
goto out_monmap;
|
|
}
|
|
monc->auth->want_keys =
|
|
CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON |
|
|
CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS;
|
|
|
|
/* msgs */
|
|
err = -ENOMEM;
|
|
monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK,
|
|
sizeof(struct ceph_mon_subscribe_ack),
|
|
GFP_NOFS, true);
|
|
if (!monc->m_subscribe_ack)
|
|
goto out_auth;
|
|
|
|
monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS,
|
|
true);
|
|
if (!monc->m_subscribe)
|
|
goto out_subscribe_ack;
|
|
|
|
monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS,
|
|
true);
|
|
if (!monc->m_auth_reply)
|
|
goto out_subscribe;
|
|
|
|
monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS, true);
|
|
monc->pending_auth = 0;
|
|
if (!monc->m_auth)
|
|
goto out_auth_reply;
|
|
|
|
ceph_con_init(&monc->con, monc, &mon_con_ops,
|
|
&monc->client->msgr);
|
|
|
|
monc->cur_mon = -1;
|
|
monc->hunting = true;
|
|
monc->sub_renew_after = jiffies;
|
|
monc->sub_sent = 0;
|
|
|
|
INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
|
|
monc->generic_request_tree = RB_ROOT;
|
|
monc->num_generic_requests = 0;
|
|
monc->last_tid = 0;
|
|
|
|
monc->have_mdsmap = 0;
|
|
monc->have_osdmap = 0;
|
|
monc->want_next_osdmap = 1;
|
|
return 0;
|
|
|
|
out_auth_reply:
|
|
ceph_msg_put(monc->m_auth_reply);
|
|
out_subscribe:
|
|
ceph_msg_put(monc->m_subscribe);
|
|
out_subscribe_ack:
|
|
ceph_msg_put(monc->m_subscribe_ack);
|
|
out_auth:
|
|
ceph_auth_destroy(monc->auth);
|
|
out_monmap:
|
|
kfree(monc->monmap);
|
|
out:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ceph_monc_init);
|
|
|
|
void ceph_monc_stop(struct ceph_mon_client *monc)
|
|
{
|
|
dout("stop\n");
|
|
cancel_delayed_work_sync(&monc->delayed_work);
|
|
|
|
mutex_lock(&monc->mutex);
|
|
__close_session(monc);
|
|
|
|
mutex_unlock(&monc->mutex);
|
|
|
|
/*
|
|
* flush msgr queue before we destroy ourselves to ensure that:
|
|
* - any work that references our embedded con is finished.
|
|
* - any osd_client or other work that may reference an authorizer
|
|
* finishes before we shut down the auth subsystem.
|
|
*/
|
|
ceph_msgr_flush();
|
|
|
|
ceph_auth_destroy(monc->auth);
|
|
|
|
ceph_msg_put(monc->m_auth);
|
|
ceph_msg_put(monc->m_auth_reply);
|
|
ceph_msg_put(monc->m_subscribe);
|
|
ceph_msg_put(monc->m_subscribe_ack);
|
|
|
|
kfree(monc->monmap);
|
|
}
|
|
EXPORT_SYMBOL(ceph_monc_stop);
|
|
|
|
static void handle_auth_reply(struct ceph_mon_client *monc,
|
|
struct ceph_msg *msg)
|
|
{
|
|
int ret;
|
|
int was_auth = 0;
|
|
int had_debugfs_info, init_debugfs = 0;
|
|
|
|
mutex_lock(&monc->mutex);
|
|
had_debugfs_info = have_debugfs_info(monc);
|
|
was_auth = ceph_auth_is_authenticated(monc->auth);
|
|
monc->pending_auth = 0;
|
|
ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base,
|
|
msg->front.iov_len,
|
|
monc->m_auth->front.iov_base,
|
|
monc->m_auth->front_alloc_len);
|
|
if (ret < 0) {
|
|
monc->client->auth_err = ret;
|
|
wake_up_all(&monc->client->auth_wq);
|
|
} else if (ret > 0) {
|
|
__send_prepared_auth_request(monc, ret);
|
|
} else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) {
|
|
dout("authenticated, starting session\n");
|
|
|
|
monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
|
|
monc->client->msgr.inst.name.num =
|
|
cpu_to_le64(monc->auth->global_id);
|
|
|
|
__send_subscribe(monc);
|
|
__resend_generic_request(monc);
|
|
}
|
|
|
|
if (!had_debugfs_info && have_debugfs_info(monc)) {
|
|
pr_info("client%lld fsid %pU\n",
|
|
ceph_client_id(monc->client),
|
|
&monc->client->fsid);
|
|
init_debugfs = 1;
|
|
}
|
|
mutex_unlock(&monc->mutex);
|
|
|
|
if (init_debugfs) {
|
|
/*
|
|
* do debugfs initialization without mutex to avoid
|
|
* creating a locking dependency
|
|
*/
|
|
ceph_debugfs_client_init(monc->client);
|
|
}
|
|
}
|
|
|
|
static int __validate_auth(struct ceph_mon_client *monc)
|
|
{
|
|
int ret;
|
|
|
|
if (monc->pending_auth)
|
|
return 0;
|
|
|
|
ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base,
|
|
monc->m_auth->front_alloc_len);
|
|
if (ret <= 0)
|
|
return ret; /* either an error, or no need to authenticate */
|
|
__send_prepared_auth_request(monc, ret);
|
|
return 0;
|
|
}
|
|
|
|
int ceph_monc_validate_auth(struct ceph_mon_client *monc)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&monc->mutex);
|
|
ret = __validate_auth(monc);
|
|
mutex_unlock(&monc->mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ceph_monc_validate_auth);
|
|
|
|
/*
|
|
* handle incoming message
|
|
*/
|
|
static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mon_client *monc = con->private;
|
|
int type = le16_to_cpu(msg->hdr.type);
|
|
|
|
if (!monc)
|
|
return;
|
|
|
|
switch (type) {
|
|
case CEPH_MSG_AUTH_REPLY:
|
|
handle_auth_reply(monc, msg);
|
|
break;
|
|
|
|
case CEPH_MSG_MON_SUBSCRIBE_ACK:
|
|
handle_subscribe_ack(monc, msg);
|
|
break;
|
|
|
|
case CEPH_MSG_STATFS_REPLY:
|
|
handle_statfs_reply(monc, msg);
|
|
break;
|
|
|
|
case CEPH_MSG_MON_GET_VERSION_REPLY:
|
|
handle_get_version_reply(monc, msg);
|
|
break;
|
|
|
|
case CEPH_MSG_MON_MAP:
|
|
ceph_monc_handle_map(monc, msg);
|
|
break;
|
|
|
|
case CEPH_MSG_OSD_MAP:
|
|
ceph_osdc_handle_map(&monc->client->osdc, msg);
|
|
break;
|
|
|
|
default:
|
|
/* can the chained handler handle it? */
|
|
if (monc->client->extra_mon_dispatch &&
|
|
monc->client->extra_mon_dispatch(monc->client, msg) == 0)
|
|
break;
|
|
|
|
pr_err("received unknown message type %d %s\n", type,
|
|
ceph_msg_type_name(type));
|
|
}
|
|
ceph_msg_put(msg);
|
|
}
|
|
|
|
/*
|
|
* Allocate memory for incoming message
|
|
*/
|
|
static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con,
|
|
struct ceph_msg_header *hdr,
|
|
int *skip)
|
|
{
|
|
struct ceph_mon_client *monc = con->private;
|
|
int type = le16_to_cpu(hdr->type);
|
|
int front_len = le32_to_cpu(hdr->front_len);
|
|
struct ceph_msg *m = NULL;
|
|
|
|
*skip = 0;
|
|
|
|
switch (type) {
|
|
case CEPH_MSG_MON_SUBSCRIBE_ACK:
|
|
m = ceph_msg_get(monc->m_subscribe_ack);
|
|
break;
|
|
case CEPH_MSG_STATFS_REPLY:
|
|
return get_generic_reply(con, hdr, skip);
|
|
case CEPH_MSG_AUTH_REPLY:
|
|
m = ceph_msg_get(monc->m_auth_reply);
|
|
break;
|
|
case CEPH_MSG_MON_GET_VERSION_REPLY:
|
|
if (le64_to_cpu(hdr->tid) != 0)
|
|
return get_generic_reply(con, hdr, skip);
|
|
|
|
/*
|
|
* Older OSDs don't set reply tid even if the orignal
|
|
* request had a non-zero tid. Workaround this weirdness
|
|
* by falling through to the allocate case.
|
|
*/
|
|
case CEPH_MSG_MON_MAP:
|
|
case CEPH_MSG_MDS_MAP:
|
|
case CEPH_MSG_OSD_MAP:
|
|
m = ceph_msg_new(type, front_len, GFP_NOFS, false);
|
|
if (!m)
|
|
return NULL; /* ENOMEM--return skip == 0 */
|
|
break;
|
|
}
|
|
|
|
if (!m) {
|
|
pr_info("alloc_msg unknown type %d\n", type);
|
|
*skip = 1;
|
|
} else if (front_len > m->front_alloc_len) {
|
|
pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n",
|
|
front_len, m->front_alloc_len,
|
|
(unsigned int)con->peer_name.type,
|
|
le64_to_cpu(con->peer_name.num));
|
|
ceph_msg_put(m);
|
|
m = ceph_msg_new(type, front_len, GFP_NOFS, false);
|
|
}
|
|
|
|
return m;
|
|
}
|
|
|
|
/*
|
|
* If the monitor connection resets, pick a new monitor and resubmit
|
|
* any pending requests.
|
|
*/
|
|
static void mon_fault(struct ceph_connection *con)
|
|
{
|
|
struct ceph_mon_client *monc = con->private;
|
|
|
|
if (!monc)
|
|
return;
|
|
|
|
dout("mon_fault\n");
|
|
mutex_lock(&monc->mutex);
|
|
if (!con->private)
|
|
goto out;
|
|
|
|
if (!monc->hunting)
|
|
pr_info("mon%d %s session lost, "
|
|
"hunting for new mon\n", monc->cur_mon,
|
|
ceph_pr_addr(&monc->con.peer_addr.in_addr));
|
|
|
|
__close_session(monc);
|
|
if (!monc->hunting) {
|
|
/* start hunting */
|
|
monc->hunting = true;
|
|
__open_session(monc);
|
|
} else {
|
|
/* already hunting, let's wait a bit */
|
|
__schedule_delayed(monc);
|
|
}
|
|
out:
|
|
mutex_unlock(&monc->mutex);
|
|
}
|
|
|
|
/*
|
|
* We can ignore refcounting on the connection struct, as all references
|
|
* will come from the messenger workqueue, which is drained prior to
|
|
* mon_client destruction.
|
|
*/
|
|
static struct ceph_connection *con_get(struct ceph_connection *con)
|
|
{
|
|
return con;
|
|
}
|
|
|
|
static void con_put(struct ceph_connection *con)
|
|
{
|
|
}
|
|
|
|
static const struct ceph_connection_operations mon_con_ops = {
|
|
.get = con_get,
|
|
.put = con_put,
|
|
.dispatch = dispatch,
|
|
.fault = mon_fault,
|
|
.alloc_msg = mon_alloc_msg,
|
|
};
|