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![Stephen Hemminger](/assets/img/avatar_default.png)
Remove blank lines at end of file and trailing whitespace. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
1360 lines
33 KiB
C
1360 lines
33 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#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/ceph_features.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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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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p += sizeof(u16); /* skip version */
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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(struct_size(m, mon_inst, 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->pending_auth = 0;
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ceph_auth_reset(monc->auth);
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}
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/*
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* Pick a new monitor at random and set cur_mon. If we are repicking
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* (i.e. cur_mon is already set), be sure to pick a different one.
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*/
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static void pick_new_mon(struct ceph_mon_client *monc)
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{
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int old_mon = monc->cur_mon;
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BUG_ON(monc->monmap->num_mon < 1);
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if (monc->monmap->num_mon == 1) {
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monc->cur_mon = 0;
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} else {
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int max = monc->monmap->num_mon;
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int o = -1;
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int n;
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if (monc->cur_mon >= 0) {
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if (monc->cur_mon < monc->monmap->num_mon)
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o = monc->cur_mon;
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if (o >= 0)
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max--;
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}
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n = prandom_u32() % max;
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if (o >= 0 && n >= o)
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n++;
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monc->cur_mon = n;
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}
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dout("%s mon%d -> mon%d out of %d mons\n", __func__, old_mon,
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monc->cur_mon, monc->monmap->num_mon);
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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 void __open_session(struct ceph_mon_client *monc)
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{
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int ret;
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pick_new_mon(monc);
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monc->hunting = true;
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if (monc->had_a_connection) {
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monc->hunt_mult *= CEPH_MONC_HUNT_BACKOFF;
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if (monc->hunt_mult > CEPH_MONC_HUNT_MAX_MULT)
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monc->hunt_mult = CEPH_MONC_HUNT_MAX_MULT;
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}
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monc->sub_renew_after = jiffies; /* i.e., expired */
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monc->sub_renew_sent = 0;
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dout("%s opening mon%d\n", __func__, monc->cur_mon);
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ceph_con_open(&monc->con, CEPH_ENTITY_TYPE_MON, monc->cur_mon,
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&monc->monmap->mon_inst[monc->cur_mon].addr);
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/*
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* send an initial keepalive to ensure our timestamp is valid
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* by the time we are in an OPENED state
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*/
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ceph_con_keepalive(&monc->con);
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/* initiate 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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BUG_ON(ret <= 0);
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__send_prepared_auth_request(monc, ret);
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}
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static void reopen_session(struct ceph_mon_client *monc)
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{
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if (!monc->hunting)
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pr_info("mon%d %s session lost, hunting for new mon\n",
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monc->cur_mon, ceph_pr_addr(&monc->con.peer_addr.in_addr));
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__close_session(monc);
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__open_session(monc);
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}
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static void un_backoff(struct ceph_mon_client *monc)
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{
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monc->hunt_mult /= 2; /* reduce by 50% */
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if (monc->hunt_mult < 1)
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monc->hunt_mult = 1;
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dout("%s hunt_mult now %d\n", __func__, monc->hunt_mult);
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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 long delay;
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if (monc->hunting)
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delay = CEPH_MONC_HUNT_INTERVAL * monc->hunt_mult;
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else
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delay = CEPH_MONC_PING_INTERVAL;
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dout("__schedule_delayed after %lu\n", delay);
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mod_delayed_work(system_wq, &monc->delayed_work,
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round_jiffies_relative(delay));
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}
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const char *ceph_sub_str[] = {
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[CEPH_SUB_MONMAP] = "monmap",
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[CEPH_SUB_OSDMAP] = "osdmap",
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[CEPH_SUB_FSMAP] = "fsmap.user",
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[CEPH_SUB_MDSMAP] = "mdsmap",
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};
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/*
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* Send subscribe request for one or more maps, according to
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* monc->subs.
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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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struct ceph_msg *msg = monc->m_subscribe;
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void *p = msg->front.iov_base;
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void *const end = p + msg->front_alloc_len;
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int num = 0;
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int i;
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dout("%s sent %lu\n", __func__, monc->sub_renew_sent);
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BUG_ON(monc->cur_mon < 0);
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if (!monc->sub_renew_sent)
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monc->sub_renew_sent = jiffies | 1; /* never 0 */
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msg->hdr.version = cpu_to_le16(2);
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for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
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if (monc->subs[i].want)
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num++;
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}
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BUG_ON(num < 1); /* monmap sub is always there */
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ceph_encode_32(&p, num);
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for (i = 0; i < ARRAY_SIZE(monc->subs); i++) {
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char buf[32];
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int len;
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if (!monc->subs[i].want)
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continue;
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len = sprintf(buf, "%s", ceph_sub_str[i]);
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if (i == CEPH_SUB_MDSMAP &&
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monc->fs_cluster_id != CEPH_FS_CLUSTER_ID_NONE)
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len += sprintf(buf + len, ".%d", monc->fs_cluster_id);
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dout("%s %s start %llu flags 0x%x\n", __func__, buf,
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le64_to_cpu(monc->subs[i].item.start),
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monc->subs[i].item.flags);
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ceph_encode_string(&p, end, buf, len);
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memcpy(p, &monc->subs[i].item, sizeof(monc->subs[i].item));
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p += sizeof(monc->subs[i].item);
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}
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BUG_ON(p > end);
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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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}
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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->sub_renew_sent) {
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/*
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* This is only needed for legacy (infernalis or older)
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* MONs -- see delayed_work().
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*/
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monc->sub_renew_after = monc->sub_renew_sent +
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(seconds >> 1) * HZ - 1;
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dout("%s sent %lu duration %d renew after %lu\n", __func__,
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monc->sub_renew_sent, seconds, monc->sub_renew_after);
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monc->sub_renew_sent = 0;
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} else {
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dout("%s sent %lu renew after %lu, ignoring\n", __func__,
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monc->sub_renew_sent, monc->sub_renew_after);
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}
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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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* Register interest in a map
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*
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* @sub: one of CEPH_SUB_*
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* @epoch: X for "every map since X", or 0 for "just the latest"
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*/
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static bool __ceph_monc_want_map(struct ceph_mon_client *monc, int sub,
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u32 epoch, bool continuous)
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{
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__le64 start = cpu_to_le64(epoch);
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u8 flags = !continuous ? CEPH_SUBSCRIBE_ONETIME : 0;
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dout("%s %s epoch %u continuous %d\n", __func__, ceph_sub_str[sub],
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epoch, continuous);
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if (monc->subs[sub].want &&
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monc->subs[sub].item.start == start &&
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monc->subs[sub].item.flags == flags)
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return false;
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monc->subs[sub].item.start = start;
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monc->subs[sub].item.flags = flags;
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monc->subs[sub].want = true;
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return true;
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}
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bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
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bool continuous)
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{
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bool need_request;
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mutex_lock(&monc->mutex);
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need_request = __ceph_monc_want_map(monc, sub, epoch, continuous);
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mutex_unlock(&monc->mutex);
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return need_request;
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}
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EXPORT_SYMBOL(ceph_monc_want_map);
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/*
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* Keep track of which maps we have
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*
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* @sub: one of CEPH_SUB_*
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*/
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static void __ceph_monc_got_map(struct ceph_mon_client *monc, int sub,
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u32 epoch)
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{
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dout("%s %s epoch %u\n", __func__, ceph_sub_str[sub], epoch);
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if (monc->subs[sub].want) {
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if (monc->subs[sub].item.flags & CEPH_SUBSCRIBE_ONETIME)
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monc->subs[sub].want = false;
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else
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monc->subs[sub].item.start = cpu_to_le64(epoch + 1);
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}
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monc->subs[sub].have = epoch;
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}
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void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch)
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{
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mutex_lock(&monc->mutex);
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__ceph_monc_got_map(monc, sub, epoch);
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mutex_unlock(&monc->mutex);
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}
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EXPORT_SYMBOL(ceph_monc_got_map);
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void ceph_monc_renew_subs(struct ceph_mon_client *monc)
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{
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mutex_lock(&monc->mutex);
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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_renew_subs);
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|
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/*
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* Wait for an osdmap with a given epoch.
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*
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* @epoch: epoch to wait for
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* @timeout: in jiffies, 0 means "wait forever"
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*/
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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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long ret;
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|
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mutex_lock(&monc->mutex);
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while (monc->subs[CEPH_SUB_OSDMAP].have < epoch) {
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mutex_unlock(&monc->mutex);
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|
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if (timeout && 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->subs[CEPH_SUB_OSDMAP].have >= epoch,
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ceph_timeout_jiffies(timeout));
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if (ret < 0)
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return ret;
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|
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mutex_lock(&monc->mutex);
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}
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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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* Open a session with a random monitor. Request monmap and osdmap,
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* which are waited upon in __ceph_open_session().
|
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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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__ceph_monc_want_map(monc, CEPH_SUB_MONMAP, 0, true);
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__ceph_monc_want_map(monc, CEPH_SUB_OSDMAP, 0, false);
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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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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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|
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mutex_lock(&monc->mutex);
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|
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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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|
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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));
|
|
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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}
|
|
|
|
client->monc.monmap = monmap;
|
|
kfree(old);
|
|
|
|
__ceph_monc_got_map(monc, CEPH_SUB_MONMAP, monc->monmap->epoch);
|
|
client->have_fsid = true;
|
|
|
|
out:
|
|
mutex_unlock(&monc->mutex);
|
|
wake_up_all(&client->auth_wq);
|
|
}
|
|
|
|
/*
|
|
* generic requests (currently statfs, mon_get_version)
|
|
*/
|
|
DEFINE_RB_FUNCS(generic_request, struct ceph_mon_generic_request, tid, node)
|
|
|
|
static void release_generic_request(struct kref *kref)
|
|
{
|
|
struct ceph_mon_generic_request *req =
|
|
container_of(kref, struct ceph_mon_generic_request, kref);
|
|
|
|
dout("%s greq %p request %p reply %p\n", __func__, req, req->request,
|
|
req->reply);
|
|
WARN_ON(!RB_EMPTY_NODE(&req->node));
|
|
|
|
if (req->reply)
|
|
ceph_msg_put(req->reply);
|
|
if (req->request)
|
|
ceph_msg_put(req->request);
|
|
|
|
kfree(req);
|
|
}
|
|
|
|
static void put_generic_request(struct ceph_mon_generic_request *req)
|
|
{
|
|
if (req)
|
|
kref_put(&req->kref, release_generic_request);
|
|
}
|
|
|
|
static void get_generic_request(struct ceph_mon_generic_request *req)
|
|
{
|
|
kref_get(&req->kref);
|
|
}
|
|
|
|
static struct ceph_mon_generic_request *
|
|
alloc_generic_request(struct ceph_mon_client *monc, gfp_t gfp)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
|
|
req = kzalloc(sizeof(*req), gfp);
|
|
if (!req)
|
|
return NULL;
|
|
|
|
req->monc = monc;
|
|
kref_init(&req->kref);
|
|
RB_CLEAR_NODE(&req->node);
|
|
init_completion(&req->completion);
|
|
|
|
dout("%s greq %p\n", __func__, req);
|
|
return req;
|
|
}
|
|
|
|
static void register_generic_request(struct ceph_mon_generic_request *req)
|
|
{
|
|
struct ceph_mon_client *monc = req->monc;
|
|
|
|
WARN_ON(req->tid);
|
|
|
|
get_generic_request(req);
|
|
req->tid = ++monc->last_tid;
|
|
insert_generic_request(&monc->generic_request_tree, req);
|
|
}
|
|
|
|
static void send_generic_request(struct ceph_mon_client *monc,
|
|
struct ceph_mon_generic_request *req)
|
|
{
|
|
WARN_ON(!req->tid);
|
|
|
|
dout("%s greq %p tid %llu\n", __func__, req, req->tid);
|
|
req->request->hdr.tid = cpu_to_le64(req->tid);
|
|
ceph_con_send(&monc->con, ceph_msg_get(req->request));
|
|
}
|
|
|
|
static void __finish_generic_request(struct ceph_mon_generic_request *req)
|
|
{
|
|
struct ceph_mon_client *monc = req->monc;
|
|
|
|
dout("%s greq %p tid %llu\n", __func__, req, req->tid);
|
|
erase_generic_request(&monc->generic_request_tree, req);
|
|
|
|
ceph_msg_revoke(req->request);
|
|
ceph_msg_revoke_incoming(req->reply);
|
|
}
|
|
|
|
static void finish_generic_request(struct ceph_mon_generic_request *req)
|
|
{
|
|
__finish_generic_request(req);
|
|
put_generic_request(req);
|
|
}
|
|
|
|
static void complete_generic_request(struct ceph_mon_generic_request *req)
|
|
{
|
|
if (req->complete_cb)
|
|
req->complete_cb(req);
|
|
else
|
|
complete_all(&req->completion);
|
|
put_generic_request(req);
|
|
}
|
|
|
|
static void cancel_generic_request(struct ceph_mon_generic_request *req)
|
|
{
|
|
struct ceph_mon_client *monc = req->monc;
|
|
struct ceph_mon_generic_request *lookup_req;
|
|
|
|
dout("%s greq %p tid %llu\n", __func__, req, req->tid);
|
|
|
|
mutex_lock(&monc->mutex);
|
|
lookup_req = lookup_generic_request(&monc->generic_request_tree,
|
|
req->tid);
|
|
if (lookup_req) {
|
|
WARN_ON(lookup_req != req);
|
|
finish_generic_request(req);
|
|
}
|
|
|
|
mutex_unlock(&monc->mutex);
|
|
}
|
|
|
|
static int wait_generic_request(struct ceph_mon_generic_request *req)
|
|
{
|
|
int ret;
|
|
|
|
dout("%s greq %p tid %llu\n", __func__, req, req->tid);
|
|
ret = wait_for_completion_interruptible(&req->completion);
|
|
if (ret)
|
|
cancel_generic_request(req);
|
|
else
|
|
ret = req->result; /* completed */
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct ceph_msg *get_generic_reply(struct ceph_connection *con,
|
|
struct ceph_msg_header *hdr,
|
|
int *skip)
|
|
{
|
|
struct ceph_mon_client *monc = con->private;
|
|
struct ceph_mon_generic_request *req;
|
|
u64 tid = le64_to_cpu(hdr->tid);
|
|
struct ceph_msg *m;
|
|
|
|
mutex_lock(&monc->mutex);
|
|
req = lookup_generic_request(&monc->generic_request_tree, tid);
|
|
if (!req) {
|
|
dout("get_generic_reply %lld dne\n", tid);
|
|
*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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
dout("%s msg %p tid %llu\n", __func__, msg, tid);
|
|
|
|
if (msg->front.iov_len != sizeof(*reply))
|
|
goto bad;
|
|
|
|
mutex_lock(&monc->mutex);
|
|
req = lookup_generic_request(&monc->generic_request_tree, tid);
|
|
if (!req) {
|
|
mutex_unlock(&monc->mutex);
|
|
return;
|
|
}
|
|
|
|
req->result = 0;
|
|
*req->u.st = reply->st; /* struct */
|
|
__finish_generic_request(req);
|
|
mutex_unlock(&monc->mutex);
|
|
|
|
complete_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, u64 data_pool,
|
|
struct ceph_statfs *buf)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
struct ceph_mon_statfs *h;
|
|
int ret = -ENOMEM;
|
|
|
|
req = alloc_generic_request(monc, GFP_NOFS);
|
|
if (!req)
|
|
goto out;
|
|
|
|
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, 64, GFP_NOFS, true);
|
|
if (!req->reply)
|
|
goto out;
|
|
|
|
req->u.st = buf;
|
|
req->request->hdr.version = cpu_to_le16(2);
|
|
|
|
mutex_lock(&monc->mutex);
|
|
register_generic_request(req);
|
|
/* 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;
|
|
h->contains_data_pool = (data_pool != CEPH_NOPOOL);
|
|
h->data_pool = cpu_to_le64(data_pool);
|
|
send_generic_request(monc, req);
|
|
mutex_unlock(&monc->mutex);
|
|
|
|
ret = wait_generic_request(req);
|
|
out:
|
|
put_generic_request(req);
|
|
return ret;
|
|
}
|
|
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 msg %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_request(&monc->generic_request_tree, handle);
|
|
if (!req) {
|
|
mutex_unlock(&monc->mutex);
|
|
return;
|
|
}
|
|
|
|
req->result = 0;
|
|
req->u.newest = ceph_decode_64(&p);
|
|
__finish_generic_request(req);
|
|
mutex_unlock(&monc->mutex);
|
|
|
|
complete_generic_request(req);
|
|
return;
|
|
|
|
bad:
|
|
pr_err("corrupt mon_get_version reply, tid %llu\n", tid);
|
|
ceph_msg_dump(msg);
|
|
}
|
|
|
|
static struct ceph_mon_generic_request *
|
|
__ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
|
|
ceph_monc_callback_t cb, u64 private_data)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
|
|
req = alloc_generic_request(monc, GFP_NOIO);
|
|
if (!req)
|
|
goto err_put_req;
|
|
|
|
req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION,
|
|
sizeof(u64) + sizeof(u32) + strlen(what),
|
|
GFP_NOIO, true);
|
|
if (!req->request)
|
|
goto err_put_req;
|
|
|
|
req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 32, GFP_NOIO,
|
|
true);
|
|
if (!req->reply)
|
|
goto err_put_req;
|
|
|
|
req->complete_cb = cb;
|
|
req->private_data = private_data;
|
|
|
|
mutex_lock(&monc->mutex);
|
|
register_generic_request(req);
|
|
{
|
|
void *p = req->request->front.iov_base;
|
|
void *const end = p + req->request->front_alloc_len;
|
|
|
|
ceph_encode_64(&p, req->tid); /* handle */
|
|
ceph_encode_string(&p, end, what, strlen(what));
|
|
WARN_ON(p != end);
|
|
}
|
|
send_generic_request(monc, req);
|
|
mutex_unlock(&monc->mutex);
|
|
|
|
return req;
|
|
|
|
err_put_req:
|
|
put_generic_request(req);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* Send MMonGetVersion and wait for the reply.
|
|
*
|
|
* @what: one of "mdsmap", "osdmap" or "monmap"
|
|
*/
|
|
int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
|
|
u64 *newest)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
int ret;
|
|
|
|
req = __ceph_monc_get_version(monc, what, NULL, 0);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
ret = wait_generic_request(req);
|
|
if (!ret)
|
|
*newest = req->u.newest;
|
|
|
|
put_generic_request(req);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ceph_monc_get_version);
|
|
|
|
/*
|
|
* Send MMonGetVersion,
|
|
*
|
|
* @what: one of "mdsmap", "osdmap" or "monmap"
|
|
*/
|
|
int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
|
|
ceph_monc_callback_t cb, u64 private_data)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
|
|
req = __ceph_monc_get_version(monc, what, cb, private_data);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
put_generic_request(req);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ceph_monc_get_version_async);
|
|
|
|
static void handle_command_ack(struct ceph_mon_client *monc,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
void *p = msg->front.iov_base;
|
|
void *const end = p + msg->front_alloc_len;
|
|
u64 tid = le64_to_cpu(msg->hdr.tid);
|
|
|
|
dout("%s msg %p tid %llu\n", __func__, msg, tid);
|
|
|
|
ceph_decode_need(&p, end, sizeof(struct ceph_mon_request_header) +
|
|
sizeof(u32), bad);
|
|
p += sizeof(struct ceph_mon_request_header);
|
|
|
|
mutex_lock(&monc->mutex);
|
|
req = lookup_generic_request(&monc->generic_request_tree, tid);
|
|
if (!req) {
|
|
mutex_unlock(&monc->mutex);
|
|
return;
|
|
}
|
|
|
|
req->result = ceph_decode_32(&p);
|
|
__finish_generic_request(req);
|
|
mutex_unlock(&monc->mutex);
|
|
|
|
complete_generic_request(req);
|
|
return;
|
|
|
|
bad:
|
|
pr_err("corrupt mon_command ack, tid %llu\n", tid);
|
|
ceph_msg_dump(msg);
|
|
}
|
|
|
|
int ceph_monc_blacklist_add(struct ceph_mon_client *monc,
|
|
struct ceph_entity_addr *client_addr)
|
|
{
|
|
struct ceph_mon_generic_request *req;
|
|
struct ceph_mon_command *h;
|
|
int ret = -ENOMEM;
|
|
int len;
|
|
|
|
req = alloc_generic_request(monc, GFP_NOIO);
|
|
if (!req)
|
|
goto out;
|
|
|
|
req->request = ceph_msg_new(CEPH_MSG_MON_COMMAND, 256, GFP_NOIO, true);
|
|
if (!req->request)
|
|
goto out;
|
|
|
|
req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, 512, GFP_NOIO,
|
|
true);
|
|
if (!req->reply)
|
|
goto out;
|
|
|
|
mutex_lock(&monc->mutex);
|
|
register_generic_request(req);
|
|
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;
|
|
h->num_strs = cpu_to_le32(1);
|
|
len = sprintf(h->str, "{ \"prefix\": \"osd blacklist\", \
|
|
\"blacklistop\": \"add\", \
|
|
\"addr\": \"%pISpc/%u\" }",
|
|
&client_addr->in_addr, le32_to_cpu(client_addr->nonce));
|
|
h->str_len = cpu_to_le32(len);
|
|
send_generic_request(monc, req);
|
|
mutex_unlock(&monc->mutex);
|
|
|
|
ret = wait_generic_request(req);
|
|
out:
|
|
put_generic_request(req);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ceph_monc_blacklist_add);
|
|
|
|
/*
|
|
* 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) {
|
|
dout("%s continuing hunt\n", __func__);
|
|
reopen_session(monc);
|
|
} else {
|
|
int is_auth = ceph_auth_is_authenticated(monc->auth);
|
|
if (ceph_con_keepalive_expired(&monc->con,
|
|
CEPH_MONC_PING_TIMEOUT)) {
|
|
dout("monc keepalive timeout\n");
|
|
is_auth = 0;
|
|
reopen_session(monc);
|
|
}
|
|
|
|
if (!monc->hunting) {
|
|
ceph_con_keepalive(&monc->con);
|
|
__validate_auth(monc);
|
|
un_backoff(monc);
|
|
}
|
|
|
|
if (is_auth &&
|
|
!(monc->con.peer_features & CEPH_FEATURE_MON_STATEFUL_SUB)) {
|
|
unsigned long now = jiffies;
|
|
|
|
dout("%s renew subs? now %lu renew after %lu\n",
|
|
__func__, now, monc->sub_renew_after);
|
|
if (time_after_eq(now, monc->sub_renew_after))
|
|
__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(struct_size(monc->monmap, mon_inst, num_mon),
|
|
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_KERNEL, true);
|
|
if (!monc->m_subscribe_ack)
|
|
goto out_auth;
|
|
|
|
monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 128,
|
|
GFP_KERNEL, true);
|
|
if (!monc->m_subscribe)
|
|
goto out_subscribe_ack;
|
|
|
|
monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096,
|
|
GFP_KERNEL, true);
|
|
if (!monc->m_auth_reply)
|
|
goto out_subscribe;
|
|
|
|
monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_KERNEL, 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->had_a_connection = false;
|
|
monc->hunt_mult = 1;
|
|
|
|
INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
|
|
monc->generic_request_tree = RB_ROOT;
|
|
monc->last_tid = 0;
|
|
|
|
monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE;
|
|
|
|
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);
|
|
monc->cur_mon = -1;
|
|
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);
|
|
|
|
WARN_ON(!RB_EMPTY_ROOT(&monc->generic_request_tree));
|
|
|
|
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 finish_hunting(struct ceph_mon_client *monc)
|
|
{
|
|
if (monc->hunting) {
|
|
dout("%s found mon%d\n", __func__, monc->cur_mon);
|
|
monc->hunting = false;
|
|
monc->had_a_connection = true;
|
|
un_backoff(monc);
|
|
__schedule_delayed(monc);
|
|
}
|
|
}
|
|
|
|
static void handle_auth_reply(struct ceph_mon_client *monc,
|
|
struct ceph_msg *msg)
|
|
{
|
|
int ret;
|
|
int was_auth = 0;
|
|
|
|
mutex_lock(&monc->mutex);
|
|
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) {
|
|
__send_prepared_auth_request(monc, ret);
|
|
goto out;
|
|
}
|
|
|
|
finish_hunting(monc);
|
|
|
|
if (ret < 0) {
|
|
monc->client->auth_err = 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);
|
|
|
|
pr_info("mon%d %s session established\n", monc->cur_mon,
|
|
ceph_pr_addr(&monc->con.peer_addr.in_addr));
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&monc->mutex);
|
|
if (monc->client->auth_err < 0)
|
|
wake_up_all(&monc->client->auth_wq);
|
|
}
|
|
|
|
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_COMMAND_ACK:
|
|
handle_command_ack(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:
|
|
case CEPH_MSG_MON_COMMAND_ACK:
|
|
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. Work around this weirdness
|
|
* by allocating a new message.
|
|
*/
|
|
/* fall through */
|
|
case CEPH_MSG_MON_MAP:
|
|
case CEPH_MSG_MDS_MAP:
|
|
case CEPH_MSG_OSD_MAP:
|
|
case CEPH_MSG_FS_MAP_USER:
|
|
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;
|
|
|
|
mutex_lock(&monc->mutex);
|
|
dout("%s mon%d\n", __func__, monc->cur_mon);
|
|
if (monc->cur_mon >= 0) {
|
|
if (!monc->hunting) {
|
|
dout("%s hunting for new mon\n", __func__);
|
|
reopen_session(monc);
|
|
__schedule_delayed(monc);
|
|
} else {
|
|
dout("%s already hunting\n", __func__);
|
|
}
|
|
}
|
|
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,
|
|
};
|