ceph: monitor client
The monitor cluster is responsible for managing cluster membership and state. The monitor client handles what minimal interaction the Ceph client has with it: checking for updated versions of the MDS and OSD maps, getting statfs() information, and unmounting. Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil
Родитель
5ecc0a0f81
Коммит
ba75bb98cf
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@ -0,0 +1,694 @@
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#include "ceph_debug.h"
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#include <linux/types.h>
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#include <linux/random.h>
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#include <linux/sched.h>
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#include "mon_client.h"
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#include "super.h"
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#include "decode.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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const static struct ceph_connection_operations mon_con_ops;
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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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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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ceph_decode_32(&p, epoch);
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ceph_decode_32(&p, num_mon);
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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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if (p != end)
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goto bad;
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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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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 (ceph_entity_addr_equal(addr, &m->mon_inst[i].addr))
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return 1;
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return 0;
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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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if (monc->con) {
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dout("__close_session closing mon%d\n", monc->cur_mon);
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ceph_con_close(monc->con);
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monc->cur_mon = -1;
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}
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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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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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monc->con->peer_name.type = CEPH_ENTITY_TYPE_MON;
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monc->con->peer_name.num = cpu_to_le64(monc->cur_mon);
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ceph_con_open(monc->con,
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&monc->monmap->mon_inst[monc->cur_mon].addr);
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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 delay;
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if (monc->cur_mon < 0 || monc->want_mount || __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)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;
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struct ceph_mon_subscribe_item *i;
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void *p, *end;
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msg = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 64, 0, 0, NULL);
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if (!msg)
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return;
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p = msg->front.iov_base;
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end = p + msg->front.iov_len;
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dout("__send_subscribe to 'mdsmap' %u+\n",
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(unsigned)monc->have_mdsmap);
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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)monc->have_osdmap);
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ceph_encode_32(&p, 2);
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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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} else {
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ceph_encode_32(&p, 1);
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}
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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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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_con_send(monc->con, 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 seconds;
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void *p = msg->front.iov_base;
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void *end = p + msg->front.iov_len;
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ceph_decode_32_safe(&p, end, seconds, bad);
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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, 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*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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}
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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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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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/*
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* mount
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*/
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static void __request_mount(struct ceph_mon_client *monc)
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{
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struct ceph_msg *msg;
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struct ceph_client_mount *h;
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int err;
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dout("__request_mount\n");
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err = __open_session(monc);
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if (err)
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return;
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msg = ceph_msg_new(CEPH_MSG_CLIENT_MOUNT, sizeof(*h), 0, 0, NULL);
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if (IS_ERR(msg))
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return;
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h = msg->front.iov_base;
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h->have_version = 0;
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ceph_con_send(monc->con, msg);
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}
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int ceph_monc_request_mount(struct ceph_mon_client *monc)
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{
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if (!monc->con) {
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monc->con = kmalloc(sizeof(*monc->con), GFP_KERNEL);
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if (!monc->con)
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return -ENOMEM;
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ceph_con_init(monc->client->msgr, monc->con);
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monc->con->private = monc;
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monc->con->ops = &mon_con_ops;
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}
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mutex_lock(&monc->mutex);
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__request_mount(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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/*
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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 handle_mount_ack(struct ceph_mon_client *monc, 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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s32 result;
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u32 len;
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s64 cnum;
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int err = -EINVAL;
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if (client->whoami >= 0) {
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dout("handle_mount_ack - already mounted\n");
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return;
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}
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mutex_lock(&monc->mutex);
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dout("handle_mount_ack\n");
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p = msg->front.iov_base;
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end = p + msg->front.iov_len;
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ceph_decode_64_safe(&p, end, cnum, bad);
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ceph_decode_32_safe(&p, end, result, bad);
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ceph_decode_32_safe(&p, end, len, bad);
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if (result) {
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pr_err("mount denied: %.*s (%d)\n", len, (char *)p,
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result);
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err = result;
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goto out;
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}
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p += 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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monmap = ceph_monmap_decode(p, p + len);
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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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err = -EINVAL;
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goto out;
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}
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p += len;
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client->monc.monmap = monmap;
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kfree(old);
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client->signed_ticket = NULL;
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client->signed_ticket_len = 0;
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monc->want_mount = false;
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client->whoami = cnum;
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client->msgr->inst.name.type = CEPH_ENTITY_TYPE_CLIENT;
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client->msgr->inst.name.num = cpu_to_le64(cnum);
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pr_info("client%lld fsid " FSID_FORMAT "\n",
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client->whoami, PR_FSID(&client->monc.monmap->fsid));
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ceph_debugfs_client_init(client);
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__send_subscribe(monc);
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err = 0;
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goto out;
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bad:
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pr_err("error decoding mount_ack message\n");
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out:
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client->mount_err = err;
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mutex_unlock(&monc->mutex);
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wake_up(&client->mount_wq);
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}
|
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|
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|
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|
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|
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/*
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* statfs
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*/
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static void handle_statfs_reply(struct ceph_mon_client *monc,
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struct ceph_msg *msg)
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{
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struct ceph_mon_statfs_request *req;
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struct ceph_mon_statfs_reply *reply = msg->front.iov_base;
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u64 tid;
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if (msg->front.iov_len != sizeof(*reply))
|
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goto bad;
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tid = le64_to_cpu(reply->tid);
|
||||
dout("handle_statfs_reply %p tid %llu\n", msg, tid);
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mutex_lock(&monc->mutex);
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req = radix_tree_lookup(&monc->statfs_request_tree, tid);
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if (req) {
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*req->buf = reply->st;
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req->result = 0;
|
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}
|
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mutex_unlock(&monc->mutex);
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if (req)
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complete(&req->completion);
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return;
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bad:
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pr_err("corrupt statfs reply, no tid\n");
|
||||
}
|
||||
|
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/*
|
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* (re)send a statfs request
|
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*/
|
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static int send_statfs(struct ceph_mon_client *monc,
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struct ceph_mon_statfs_request *req)
|
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{
|
||||
struct ceph_msg *msg;
|
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struct ceph_mon_statfs *h;
|
||||
int err;
|
||||
|
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dout("send_statfs tid %llu\n", req->tid);
|
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err = __open_session(monc);
|
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if (err)
|
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return err;
|
||||
msg = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), 0, 0, NULL);
|
||||
if (IS_ERR(msg))
|
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return PTR_ERR(msg);
|
||||
req->request = msg;
|
||||
h = msg->front.iov_base;
|
||||
h->have_version = 0;
|
||||
h->fsid = monc->monmap->fsid;
|
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h->tid = cpu_to_le64(req->tid);
|
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ceph_con_send(monc->con, msg);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Do a synchronous statfs().
|
||||
*/
|
||||
int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf)
|
||||
{
|
||||
struct ceph_mon_statfs_request req;
|
||||
int err;
|
||||
|
||||
req.buf = buf;
|
||||
init_completion(&req.completion);
|
||||
|
||||
/* allocate memory for reply */
|
||||
err = ceph_msgpool_resv(&monc->msgpool_statfs_reply, 1);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/* register request */
|
||||
mutex_lock(&monc->mutex);
|
||||
req.tid = ++monc->last_tid;
|
||||
req.last_attempt = jiffies;
|
||||
req.delay = BASE_DELAY_INTERVAL;
|
||||
if (radix_tree_insert(&monc->statfs_request_tree, req.tid, &req) < 0) {
|
||||
mutex_unlock(&monc->mutex);
|
||||
pr_err("ENOMEM in do_statfs\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
monc->num_statfs_requests++;
|
||||
mutex_unlock(&monc->mutex);
|
||||
|
||||
/* send request and wait */
|
||||
err = send_statfs(monc, &req);
|
||||
if (!err)
|
||||
err = wait_for_completion_interruptible(&req.completion);
|
||||
|
||||
mutex_lock(&monc->mutex);
|
||||
radix_tree_delete(&monc->statfs_request_tree, req.tid);
|
||||
monc->num_statfs_requests--;
|
||||
ceph_msgpool_resv(&monc->msgpool_statfs_reply, -1);
|
||||
mutex_unlock(&monc->mutex);
|
||||
|
||||
if (!err)
|
||||
err = req.result;
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* Resend pending statfs requests.
|
||||
*/
|
||||
static void __resend_statfs(struct ceph_mon_client *monc)
|
||||
{
|
||||
u64 next_tid = 0;
|
||||
int got;
|
||||
int did = 0;
|
||||
struct ceph_mon_statfs_request *req;
|
||||
|
||||
while (1) {
|
||||
got = radix_tree_gang_lookup(&monc->statfs_request_tree,
|
||||
(void **)&req,
|
||||
next_tid, 1);
|
||||
if (got == 0)
|
||||
break;
|
||||
did++;
|
||||
next_tid = req->tid + 1;
|
||||
|
||||
send_statfs(monc, req);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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->want_mount) {
|
||||
__request_mount(monc);
|
||||
} else {
|
||||
if (__sub_expired(monc)) {
|
||||
__close_session(monc);
|
||||
__open_session(monc); /* continue hunting */
|
||||
} else {
|
||||
ceph_con_keepalive(monc->con);
|
||||
}
|
||||
}
|
||||
__send_subscribe(monc);
|
||||
__schedule_delayed(monc);
|
||||
mutex_unlock(&monc->mutex);
|
||||
}
|
||||
|
||||
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);
|
||||
|
||||
monc->con = NULL;
|
||||
|
||||
/* msg pools */
|
||||
err = ceph_msgpool_init(&monc->msgpool_mount_ack, 4096, 1, false);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
err = ceph_msgpool_init(&monc->msgpool_subscribe_ack, 8, 1, false);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
err = ceph_msgpool_init(&monc->msgpool_statfs_reply,
|
||||
sizeof(struct ceph_mon_statfs_reply), 0, false);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
monc->cur_mon = -1;
|
||||
monc->hunting = false; /* not really */
|
||||
monc->sub_renew_after = jiffies;
|
||||
monc->sub_sent = 0;
|
||||
|
||||
INIT_DELAYED_WORK(&monc->delayed_work, delayed_work);
|
||||
INIT_RADIX_TREE(&monc->statfs_request_tree, GFP_NOFS);
|
||||
monc->num_statfs_requests = 0;
|
||||
monc->last_tid = 0;
|
||||
|
||||
monc->have_mdsmap = 0;
|
||||
monc->have_osdmap = 0;
|
||||
monc->want_next_osdmap = 1;
|
||||
monc->want_mount = true;
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
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);
|
||||
if (monc->con) {
|
||||
monc->con->private = NULL;
|
||||
monc->con->ops->put(monc->con);
|
||||
monc->con = NULL;
|
||||
}
|
||||
mutex_unlock(&monc->mutex);
|
||||
|
||||
ceph_msgpool_destroy(&monc->msgpool_mount_ack);
|
||||
ceph_msgpool_destroy(&monc->msgpool_subscribe_ack);
|
||||
ceph_msgpool_destroy(&monc->msgpool_statfs_reply);
|
||||
|
||||
kfree(monc->monmap);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* 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_CLIENT_MOUNT_ACK:
|
||||
handle_mount_ack(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_MDS_MAP:
|
||||
ceph_mdsc_handle_map(&monc->client->mdsc, msg);
|
||||
break;
|
||||
|
||||
case CEPH_MSG_OSD_MAP:
|
||||
ceph_osdc_handle_map(&monc->client->osdc, msg);
|
||||
break;
|
||||
|
||||
default:
|
||||
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)
|
||||
{
|
||||
struct ceph_mon_client *monc = con->private;
|
||||
int type = le16_to_cpu(hdr->type);
|
||||
|
||||
switch (type) {
|
||||
case CEPH_MSG_CLIENT_MOUNT_ACK:
|
||||
return ceph_msgpool_get(&monc->msgpool_mount_ack);
|
||||
case CEPH_MSG_MON_SUBSCRIBE_ACK:
|
||||
return ceph_msgpool_get(&monc->msgpool_subscribe_ack);
|
||||
case CEPH_MSG_STATFS_REPLY:
|
||||
return ceph_msgpool_get(&monc->msgpool_statfs_reply);
|
||||
}
|
||||
return ceph_alloc_msg(con, hdr);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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->con && !monc->hunting)
|
||||
pr_info("mon%d %s session lost, "
|
||||
"hunting for new mon\n", monc->cur_mon,
|
||||
pr_addr(&monc->con->peer_addr.in_addr));
|
||||
|
||||
__close_session(monc);
|
||||
if (!monc->hunting) {
|
||||
/* start hunting */
|
||||
monc->hunting = true;
|
||||
if (__open_session(monc) == 0) {
|
||||
__send_subscribe(monc);
|
||||
__resend_statfs(monc);
|
||||
}
|
||||
} else {
|
||||
/* already hunting, let's wait a bit */
|
||||
__schedule_delayed(monc);
|
||||
}
|
||||
out:
|
||||
mutex_unlock(&monc->mutex);
|
||||
}
|
||||
|
||||
const static struct ceph_connection_operations mon_con_ops = {
|
||||
.get = ceph_con_get,
|
||||
.put = ceph_con_put,
|
||||
.dispatch = dispatch,
|
||||
.fault = mon_fault,
|
||||
.alloc_msg = mon_alloc_msg,
|
||||
.alloc_middle = ceph_alloc_middle,
|
||||
};
|
||||
|
|
@ -0,0 +1,109 @@
|
|||
#ifndef _FS_CEPH_MON_CLIENT_H
|
||||
#define _FS_CEPH_MON_CLIENT_H
|
||||
|
||||
#include <linux/completion.h>
|
||||
#include <linux/radix-tree.h>
|
||||
|
||||
#include "messenger.h"
|
||||
#include "msgpool.h"
|
||||
|
||||
struct ceph_client;
|
||||
struct ceph_mount_args;
|
||||
|
||||
/*
|
||||
* The monitor map enumerates the set of all monitors.
|
||||
*/
|
||||
struct ceph_monmap {
|
||||
struct ceph_fsid fsid;
|
||||
u32 epoch;
|
||||
u32 num_mon;
|
||||
struct ceph_entity_inst mon_inst[0];
|
||||
};
|
||||
|
||||
struct ceph_mon_client;
|
||||
struct ceph_mon_statfs_request;
|
||||
|
||||
|
||||
/*
|
||||
* Generic mechanism for resending monitor requests.
|
||||
*/
|
||||
typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
|
||||
int newmon);
|
||||
|
||||
/* a pending monitor request */
|
||||
struct ceph_mon_request {
|
||||
struct ceph_mon_client *monc;
|
||||
struct delayed_work delayed_work;
|
||||
unsigned long delay;
|
||||
ceph_monc_request_func_t do_request;
|
||||
};
|
||||
|
||||
/*
|
||||
* statfs() is done a bit differently because we need to get data back
|
||||
* to the caller
|
||||
*/
|
||||
struct ceph_mon_statfs_request {
|
||||
u64 tid;
|
||||
int result;
|
||||
struct ceph_statfs *buf;
|
||||
struct completion completion;
|
||||
unsigned long last_attempt, delay; /* jiffies */
|
||||
struct ceph_msg *request; /* original request */
|
||||
};
|
||||
|
||||
struct ceph_mon_client {
|
||||
struct ceph_client *client;
|
||||
struct ceph_monmap *monmap;
|
||||
|
||||
struct mutex mutex;
|
||||
struct delayed_work delayed_work;
|
||||
|
||||
bool hunting;
|
||||
int cur_mon; /* last monitor i contacted */
|
||||
unsigned long sub_sent, sub_renew_after;
|
||||
struct ceph_connection *con;
|
||||
|
||||
/* msg pools */
|
||||
struct ceph_msgpool msgpool_mount_ack;
|
||||
struct ceph_msgpool msgpool_subscribe_ack;
|
||||
struct ceph_msgpool msgpool_statfs_reply;
|
||||
|
||||
/* pending statfs requests */
|
||||
struct radix_tree_root statfs_request_tree;
|
||||
int num_statfs_requests;
|
||||
u64 last_tid;
|
||||
|
||||
/* mds/osd map or mount requests */
|
||||
bool want_mount;
|
||||
int want_next_osdmap; /* 1 = want, 2 = want+asked */
|
||||
u32 have_osdmap, have_mdsmap;
|
||||
|
||||
struct dentry *debugfs_file;
|
||||
};
|
||||
|
||||
extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
|
||||
extern int ceph_monmap_contains(struct ceph_monmap *m,
|
||||
struct ceph_entity_addr *addr);
|
||||
|
||||
extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
|
||||
extern void ceph_monc_stop(struct ceph_mon_client *monc);
|
||||
|
||||
/*
|
||||
* The model here is to indicate that we need a new map of at least
|
||||
* epoch @want, and also call in when we receive a map. We will
|
||||
* periodically rerequest the map from the monitor cluster until we
|
||||
* get what we want.
|
||||
*/
|
||||
extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
|
||||
extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
|
||||
|
||||
extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
|
||||
|
||||
extern int ceph_monc_request_mount(struct ceph_mon_client *monc);
|
||||
|
||||
extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
|
||||
struct ceph_statfs *buf);
|
||||
|
||||
|
||||
|
||||
#endif
|
||||
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