forked from Minki/linux
ceph: use rbtree for mds requests
The rbtree is a more appropriate data structure than a radix_tree. It avoids extra memory usage and simplifies the code. It also fixes a bug where the debugfs 'mdsc' file wasn't including the most recent mds request. Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil
parent
91e45ce389
commit
44ca18f268
@ -142,21 +142,16 @@ static int monc_show(struct seq_file *s, void *p)
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static int mdsc_show(struct seq_file *s, void *p)
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{
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struct ceph_client *client = s->private;
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struct ceph_mds_request *req;
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u64 nexttid = 0;
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int got;
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struct ceph_mds_client *mdsc = &client->mdsc;
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struct ceph_mds_request *req;
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struct rb_node *rp;
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int pathlen;
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u64 pathbase;
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char *path;
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mutex_lock(&mdsc->mutex);
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while (nexttid < mdsc->last_tid) {
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got = radix_tree_gang_lookup(&mdsc->request_tree,
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(void **)&req, nexttid, 1);
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if (got == 0)
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break;
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nexttid = req->r_tid + 1;
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for (rp = rb_first(&mdsc->request_tree); rp; rp = rb_next(rp)) {
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req = rb_entry(rp, struct ceph_mds_request, r_node);
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if (req->r_request)
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seq_printf(s, "%lld\tmds%d\t", req->r_tid, req->r_mds);
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@ -255,6 +255,7 @@ static const char *session_state_name(int s)
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case CEPH_MDS_SESSION_OPEN: return "open";
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case CEPH_MDS_SESSION_HUNG: return "hung";
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case CEPH_MDS_SESSION_CLOSING: return "closing";
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case CEPH_MDS_SESSION_RESTARTING: return "restarting";
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case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
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default: return "???";
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}
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@ -448,10 +449,42 @@ static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
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u64 tid)
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{
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struct ceph_mds_request *req;
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req = radix_tree_lookup(&mdsc->request_tree, tid);
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if (req)
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ceph_mdsc_get_request(req);
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return req;
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struct rb_node *n = mdsc->request_tree.rb_node;
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while (n) {
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req = rb_entry(n, struct ceph_mds_request, r_node);
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if (tid < req->r_tid)
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n = n->rb_left;
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else if (tid > req->r_tid)
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n = n->rb_right;
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else {
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ceph_mdsc_get_request(req);
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return req;
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}
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}
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return NULL;
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}
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static void __insert_request(struct ceph_mds_client *mdsc,
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struct ceph_mds_request *new)
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{
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struct rb_node **p = &mdsc->request_tree.rb_node;
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struct rb_node *parent = NULL;
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struct ceph_mds_request *req = NULL;
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while (*p) {
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parent = *p;
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req = rb_entry(parent, struct ceph_mds_request, r_node);
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if (new->r_tid < req->r_tid)
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p = &(*p)->rb_left;
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else if (new->r_tid > req->r_tid)
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p = &(*p)->rb_right;
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else
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BUG();
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}
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rb_link_node(&new->r_node, parent, p);
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rb_insert_color(&new->r_node, &mdsc->request_tree);
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}
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/*
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@ -469,7 +502,7 @@ static void __register_request(struct ceph_mds_client *mdsc,
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ceph_reserve_caps(&req->r_caps_reservation, req->r_num_caps);
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dout("__register_request %p tid %lld\n", req, req->r_tid);
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ceph_mdsc_get_request(req);
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radix_tree_insert(&mdsc->request_tree, req->r_tid, (void *)req);
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__insert_request(mdsc, req);
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if (dir) {
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struct ceph_inode_info *ci = ceph_inode(dir);
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@ -485,7 +518,7 @@ static void __unregister_request(struct ceph_mds_client *mdsc,
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struct ceph_mds_request *req)
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{
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dout("__unregister_request %p tid %lld\n", req, req->r_tid);
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radix_tree_delete(&mdsc->request_tree, req->r_tid);
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rb_erase(&req->r_node, &mdsc->request_tree);
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ceph_mdsc_put_request(req);
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if (req->r_unsafe_dir) {
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@ -1115,17 +1148,25 @@ ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
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}
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/*
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* return oldest (lowest) tid in request tree, 0 if none.
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* return oldest (lowest) request, tid in request tree, 0 if none.
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*
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* called under mdsc->mutex.
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*/
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static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
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{
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if (RB_EMPTY_ROOT(&mdsc->request_tree))
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return NULL;
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return rb_entry(rb_first(&mdsc->request_tree),
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struct ceph_mds_request, r_node);
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}
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static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
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{
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struct ceph_mds_request *first;
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if (radix_tree_gang_lookup(&mdsc->request_tree,
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(void **)&first, 0, 1) <= 0)
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return 0;
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return first->r_tid;
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struct ceph_mds_request *req = __get_oldest_req(mdsc);
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if (req)
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return req->r_tid;
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return 0;
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}
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/*
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@ -1540,26 +1581,19 @@ static void __wake_requests(struct ceph_mds_client *mdsc,
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*/
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static void kick_requests(struct ceph_mds_client *mdsc, int mds, int all)
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{
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struct ceph_mds_request *reqs[10];
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u64 nexttid = 0;
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int i, got;
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struct ceph_mds_request *req;
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struct rb_node *p;
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dout("kick_requests mds%d\n", mds);
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while (nexttid <= mdsc->last_tid) {
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got = radix_tree_gang_lookup(&mdsc->request_tree,
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(void **)&reqs, nexttid, 10);
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if (got == 0)
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break;
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nexttid = reqs[got-1]->r_tid + 1;
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for (i = 0; i < got; i++) {
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if (reqs[i]->r_got_unsafe)
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continue;
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if (reqs[i]->r_session &&
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reqs[i]->r_session->s_mds == mds) {
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dout(" kicking tid %llu\n", reqs[i]->r_tid);
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put_request_session(reqs[i]);
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__do_request(mdsc, reqs[i]);
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}
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for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
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req = rb_entry(p, struct ceph_mds_request, r_node);
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if (req->r_got_unsafe)
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continue;
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if (req->r_session &&
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req->r_session->s_mds == mds) {
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dout(" kicking tid %llu\n", req->r_tid);
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put_request_session(req);
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__do_request(mdsc, req);
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}
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}
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}
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@ -1748,7 +1782,7 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
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list_del_init(&req->r_unsafe_item);
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/* last unsafe request during umount? */
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if (mdsc->stopping && !__get_oldest_tid(mdsc))
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if (mdsc->stopping && !__get_oldest_req(mdsc))
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complete(&mdsc->safe_umount_waiters);
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mutex_unlock(&mdsc->mutex);
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goto out;
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@ -2573,7 +2607,7 @@ int ceph_mdsc_init(struct ceph_mds_client *mdsc, struct ceph_client *client)
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INIT_LIST_HEAD(&mdsc->snap_empty);
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spin_lock_init(&mdsc->snap_empty_lock);
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mdsc->last_tid = 0;
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INIT_RADIX_TREE(&mdsc->request_tree, GFP_NOFS);
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mdsc->request_tree = RB_ROOT;
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INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
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mdsc->last_renew_caps = jiffies;
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INIT_LIST_HEAD(&mdsc->cap_delay_list);
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@ -2600,20 +2634,19 @@ static void wait_requests(struct ceph_mds_client *mdsc)
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struct ceph_client *client = mdsc->client;
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mutex_lock(&mdsc->mutex);
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if (__get_oldest_tid(mdsc)) {
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if (__get_oldest_req(mdsc)) {
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mutex_unlock(&mdsc->mutex);
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dout("wait_requests waiting for requests\n");
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wait_for_completion_timeout(&mdsc->safe_umount_waiters,
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client->mount_args->mount_timeout * HZ);
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mutex_lock(&mdsc->mutex);
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/* tear down remaining requests */
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while (radix_tree_gang_lookup(&mdsc->request_tree,
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(void **)&req, 0, 1)) {
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mutex_lock(&mdsc->mutex);
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while ((req = __get_oldest_req(mdsc))) {
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dout("wait_requests timed out on tid %llu\n",
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req->r_tid);
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radix_tree_delete(&mdsc->request_tree, req->r_tid);
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ceph_mdsc_put_request(req);
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__unregister_request(mdsc, req);
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}
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}
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mutex_unlock(&mdsc->mutex);
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@ -2639,31 +2672,29 @@ void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
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*/
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static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
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{
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struct ceph_mds_request *req;
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u64 next_tid = 0;
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int got;
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struct ceph_mds_request *req = NULL;
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struct rb_node *n;
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mutex_lock(&mdsc->mutex);
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dout("wait_unsafe_requests want %lld\n", want_tid);
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while (1) {
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got = radix_tree_gang_lookup(&mdsc->request_tree, (void **)&req,
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next_tid, 1);
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if (!got)
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req = __get_oldest_req(mdsc);
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while (req && req->r_tid <= want_tid) {
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if ((req->r_op & CEPH_MDS_OP_WRITE)) {
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/* write op */
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ceph_mdsc_get_request(req);
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mutex_unlock(&mdsc->mutex);
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dout("wait_unsafe_requests wait on %llu (want %llu)\n",
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req->r_tid, want_tid);
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wait_for_completion(&req->r_safe_completion);
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mutex_lock(&mdsc->mutex);
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n = rb_next(&req->r_node);
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ceph_mdsc_put_request(req);
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} else {
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n = rb_next(&req->r_node);
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}
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if (!n)
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break;
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if (req->r_tid > want_tid)
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break;
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next_tid = req->r_tid + 1;
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if ((req->r_op & CEPH_MDS_OP_WRITE) == 0)
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continue; /* not a write op */
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ceph_mdsc_get_request(req);
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mutex_unlock(&mdsc->mutex);
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dout("wait_unsafe_requests wait on %llu (want %llu)\n",
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req->r_tid, want_tid);
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wait_for_completion(&req->r_safe_completion);
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mutex_lock(&mdsc->mutex);
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ceph_mdsc_put_request(req);
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req = rb_entry(n, struct ceph_mds_request, r_node);
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}
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mutex_unlock(&mdsc->mutex);
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dout("wait_unsafe_requests done\n");
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@ -6,6 +6,7 @@
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/radix-tree.h>
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#include <linux/rbtree.h>
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#include <linux/spinlock.h>
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#include "types.h"
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@ -150,6 +151,7 @@ typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
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*/
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struct ceph_mds_request {
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u64 r_tid; /* transaction id */
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struct rb_node r_node;
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int r_op; /* mds op code */
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int r_mds;
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@ -249,7 +251,7 @@ struct ceph_mds_client {
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spinlock_t snap_empty_lock; /* protect snap_empty */
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u64 last_tid; /* most recent mds request */
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struct radix_tree_root request_tree; /* pending mds requests */
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struct rb_root request_tree; /* pending mds requests */
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struct delayed_work delayed_work; /* delayed work */
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unsigned long last_renew_caps; /* last time we renewed our caps */
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struct list_head cap_delay_list; /* caps with delayed release */
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