#include "ceph_debug.h" #include #include #include "mds_client.h" #include "mon_client.h" #include "super.h" #include "messenger.h" #include "decode.h" #include "auth.h" /* * A cluster of MDS (metadata server) daemons is responsible for * managing the file system namespace (the directory hierarchy and * inodes) and for coordinating shared access to storage. Metadata is * partitioning hierarchically across a number of servers, and that * partition varies over time as the cluster adjusts the distribution * in order to balance load. * * The MDS client is primarily responsible to managing synchronous * metadata requests for operations like open, unlink, and so forth. * If there is a MDS failure, we find out about it when we (possibly * request and) receive a new MDS map, and can resubmit affected * requests. * * For the most part, though, we take advantage of a lossless * communications channel to the MDS, and do not need to worry about * timing out or resubmitting requests. * * We maintain a stateful "session" with each MDS we interact with. * Within each session, we sent periodic heartbeat messages to ensure * any capabilities or leases we have been issues remain valid. If * the session times out and goes stale, our leases and capabilities * are no longer valid. */ static void __wake_requests(struct ceph_mds_client *mdsc, struct list_head *head); const static struct ceph_connection_operations mds_con_ops; /* * mds reply parsing */ /* * parse individual inode info */ static int parse_reply_info_in(void **p, void *end, struct ceph_mds_reply_info_in *info) { int err = -EIO; info->in = *p; *p += sizeof(struct ceph_mds_reply_inode) + sizeof(*info->in->fragtree.splits) * le32_to_cpu(info->in->fragtree.nsplits); ceph_decode_32_safe(p, end, info->symlink_len, bad); ceph_decode_need(p, end, info->symlink_len, bad); info->symlink = *p; *p += info->symlink_len; ceph_decode_32_safe(p, end, info->xattr_len, bad); ceph_decode_need(p, end, info->xattr_len, bad); info->xattr_data = *p; *p += info->xattr_len; return 0; bad: return err; } /* * parse a normal reply, which may contain a (dir+)dentry and/or a * target inode. */ static int parse_reply_info_trace(void **p, void *end, struct ceph_mds_reply_info_parsed *info) { int err; if (info->head->is_dentry) { err = parse_reply_info_in(p, end, &info->diri); if (err < 0) goto out_bad; if (unlikely(*p + sizeof(*info->dirfrag) > end)) goto bad; info->dirfrag = *p; *p += sizeof(*info->dirfrag) + sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); if (unlikely(*p > end)) goto bad; ceph_decode_32_safe(p, end, info->dname_len, bad); ceph_decode_need(p, end, info->dname_len, bad); info->dname = *p; *p += info->dname_len; info->dlease = *p; *p += sizeof(*info->dlease); } if (info->head->is_target) { err = parse_reply_info_in(p, end, &info->targeti); if (err < 0) goto out_bad; } if (unlikely(*p != end)) goto bad; return 0; bad: err = -EIO; out_bad: pr_err("problem parsing mds trace %d\n", err); return err; } /* * parse readdir results */ static int parse_reply_info_dir(void **p, void *end, struct ceph_mds_reply_info_parsed *info) { u32 num, i = 0; int err; info->dir_dir = *p; if (*p + sizeof(*info->dir_dir) > end) goto bad; *p += sizeof(*info->dir_dir) + sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); if (*p > end) goto bad; ceph_decode_need(p, end, sizeof(num) + 2, bad); num = ceph_decode_32(p); info->dir_end = ceph_decode_8(p); info->dir_complete = ceph_decode_8(p); if (num == 0) goto done; /* alloc large array */ info->dir_nr = num; info->dir_in = kcalloc(num, sizeof(*info->dir_in) + sizeof(*info->dir_dname) + sizeof(*info->dir_dname_len) + sizeof(*info->dir_dlease), GFP_NOFS); if (info->dir_in == NULL) { err = -ENOMEM; goto out_bad; } info->dir_dname = (void *)(info->dir_in + num); info->dir_dname_len = (void *)(info->dir_dname + num); info->dir_dlease = (void *)(info->dir_dname_len + num); while (num) { /* dentry */ ceph_decode_need(p, end, sizeof(u32)*2, bad); info->dir_dname_len[i] = ceph_decode_32(p); ceph_decode_need(p, end, info->dir_dname_len[i], bad); info->dir_dname[i] = *p; *p += info->dir_dname_len[i]; dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i], info->dir_dname[i]); info->dir_dlease[i] = *p; *p += sizeof(struct ceph_mds_reply_lease); /* inode */ err = parse_reply_info_in(p, end, &info->dir_in[i]); if (err < 0) goto out_bad; i++; num--; } done: if (*p != end) goto bad; return 0; bad: err = -EIO; out_bad: pr_err("problem parsing dir contents %d\n", err); return err; } /* * parse entire mds reply */ static int parse_reply_info(struct ceph_msg *msg, struct ceph_mds_reply_info_parsed *info) { void *p, *end; u32 len; int err; info->head = msg->front.iov_base; p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); /* trace */ ceph_decode_32_safe(&p, end, len, bad); if (len > 0) { err = parse_reply_info_trace(&p, p+len, info); if (err < 0) goto out_bad; } /* dir content */ ceph_decode_32_safe(&p, end, len, bad); if (len > 0) { err = parse_reply_info_dir(&p, p+len, info); if (err < 0) goto out_bad; } /* snap blob */ ceph_decode_32_safe(&p, end, len, bad); info->snapblob_len = len; info->snapblob = p; p += len; if (p != end) goto bad; return 0; bad: err = -EIO; out_bad: pr_err("mds parse_reply err %d\n", err); return err; } static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) { kfree(info->dir_in); } /* * sessions */ static const char *session_state_name(int s) { switch (s) { case CEPH_MDS_SESSION_NEW: return "new"; case CEPH_MDS_SESSION_OPENING: return "opening"; case CEPH_MDS_SESSION_OPEN: return "open"; case CEPH_MDS_SESSION_HUNG: return "hung"; case CEPH_MDS_SESSION_CLOSING: return "closing"; case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; default: return "???"; } } static struct ceph_mds_session *get_session(struct ceph_mds_session *s) { if (atomic_inc_not_zero(&s->s_ref)) { dout("mdsc get_session %p %d -> %d\n", s, atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref)); return s; } else { dout("mdsc get_session %p 0 -- FAIL", s); return NULL; } } void ceph_put_mds_session(struct ceph_mds_session *s) { dout("mdsc put_session %p %d -> %d\n", s, atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1); if (atomic_dec_and_test(&s->s_ref)) { if (s->s_authorizer) s->s_mdsc->client->monc.auth->ops->destroy_authorizer( s->s_mdsc->client->monc.auth, s->s_authorizer); kfree(s); } } /* * called under mdsc->mutex */ struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, int mds) { struct ceph_mds_session *session; if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL) return NULL; session = mdsc->sessions[mds]; dout("lookup_mds_session %p %d\n", session, atomic_read(&session->s_ref)); get_session(session); return session; } static bool __have_session(struct ceph_mds_client *mdsc, int mds) { if (mds >= mdsc->max_sessions) return false; return mdsc->sessions[mds]; } /* * create+register a new session for given mds. * called under mdsc->mutex. */ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, int mds) { struct ceph_mds_session *s; s = kzalloc(sizeof(*s), GFP_NOFS); s->s_mdsc = mdsc; s->s_mds = mds; s->s_state = CEPH_MDS_SESSION_NEW; s->s_ttl = 0; s->s_seq = 0; mutex_init(&s->s_mutex); ceph_con_init(mdsc->client->msgr, &s->s_con); s->s_con.private = s; s->s_con.ops = &mds_con_ops; s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS; s->s_con.peer_name.num = cpu_to_le64(mds); spin_lock_init(&s->s_cap_lock); s->s_cap_gen = 0; s->s_cap_ttl = 0; s->s_renew_requested = 0; s->s_renew_seq = 0; INIT_LIST_HEAD(&s->s_caps); s->s_nr_caps = 0; atomic_set(&s->s_ref, 1); INIT_LIST_HEAD(&s->s_waiting); INIT_LIST_HEAD(&s->s_unsafe); s->s_num_cap_releases = 0; INIT_LIST_HEAD(&s->s_cap_releases); INIT_LIST_HEAD(&s->s_cap_releases_done); INIT_LIST_HEAD(&s->s_cap_flushing); INIT_LIST_HEAD(&s->s_cap_snaps_flushing); dout("register_session mds%d\n", mds); if (mds >= mdsc->max_sessions) { int newmax = 1 << get_count_order(mds+1); struct ceph_mds_session **sa; dout("register_session realloc to %d\n", newmax); sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); if (sa == NULL) goto fail_realloc; if (mdsc->sessions) { memcpy(sa, mdsc->sessions, mdsc->max_sessions * sizeof(void *)); kfree(mdsc->sessions); } mdsc->sessions = sa; mdsc->max_sessions = newmax; } mdsc->sessions[mds] = s; atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */ ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); return s; fail_realloc: kfree(s); return ERR_PTR(-ENOMEM); } /* * called under mdsc->mutex */ static void unregister_session(struct ceph_mds_client *mdsc, struct ceph_mds_session *s) { dout("unregister_session mds%d %p\n", s->s_mds, s); mdsc->sessions[s->s_mds] = NULL; ceph_con_close(&s->s_con); ceph_put_mds_session(s); } /* * drop session refs in request. * * should be last request ref, or hold mdsc->mutex */ static void put_request_session(struct ceph_mds_request *req) { if (req->r_session) { ceph_put_mds_session(req->r_session); req->r_session = NULL; } } void ceph_mdsc_release_request(struct kref *kref) { struct ceph_mds_request *req = container_of(kref, struct ceph_mds_request, r_kref); if (req->r_request) ceph_msg_put(req->r_request); if (req->r_reply) { ceph_msg_put(req->r_reply); destroy_reply_info(&req->r_reply_info); } if (req->r_inode) { ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); iput(req->r_inode); } if (req->r_locked_dir) ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); if (req->r_target_inode) iput(req->r_target_inode); if (req->r_dentry) dput(req->r_dentry); if (req->r_old_dentry) { ceph_put_cap_refs( ceph_inode(req->r_old_dentry->d_parent->d_inode), CEPH_CAP_PIN); dput(req->r_old_dentry); } kfree(req->r_path1); kfree(req->r_path2); put_request_session(req); ceph_unreserve_caps(&req->r_caps_reservation); kfree(req); } /* * lookup session, bump ref if found. * * called under mdsc->mutex. */ static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc, u64 tid) { struct ceph_mds_request *req; req = radix_tree_lookup(&mdsc->request_tree, tid); if (req) ceph_mdsc_get_request(req); return req; } /* * Register an in-flight request, and assign a tid. Link to directory * are modifying (if any). * * Called under mdsc->mutex. */ static void __register_request(struct ceph_mds_client *mdsc, struct ceph_mds_request *req, struct inode *dir) { req->r_tid = ++mdsc->last_tid; if (req->r_num_caps) ceph_reserve_caps(&req->r_caps_reservation, req->r_num_caps); dout("__register_request %p tid %lld\n", req, req->r_tid); ceph_mdsc_get_request(req); radix_tree_insert(&mdsc->request_tree, req->r_tid, (void *)req); if (dir) { struct ceph_inode_info *ci = ceph_inode(dir); spin_lock(&ci->i_unsafe_lock); req->r_unsafe_dir = dir; list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops); spin_unlock(&ci->i_unsafe_lock); } } static void __unregister_request(struct ceph_mds_client *mdsc, struct ceph_mds_request *req) { dout("__unregister_request %p tid %lld\n", req, req->r_tid); radix_tree_delete(&mdsc->request_tree, req->r_tid); ceph_mdsc_put_request(req); if (req->r_unsafe_dir) { struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); spin_lock(&ci->i_unsafe_lock); list_del_init(&req->r_unsafe_dir_item); spin_unlock(&ci->i_unsafe_lock); } } /* * Choose mds to send request to next. If there is a hint set in the * request (e.g., due to a prior forward hint from the mds), use that. * Otherwise, consult frag tree and/or caps to identify the * appropriate mds. If all else fails, choose randomly. * * Called under mdsc->mutex. */ static int __choose_mds(struct ceph_mds_client *mdsc, struct ceph_mds_request *req) { struct inode *inode; struct ceph_inode_info *ci; struct ceph_cap *cap; int mode = req->r_direct_mode; int mds = -1; u32 hash = req->r_direct_hash; bool is_hash = req->r_direct_is_hash; /* * is there a specific mds we should try? ignore hint if we have * no session and the mds is not up (active or recovering). */ if (req->r_resend_mds >= 0 && (__have_session(mdsc, req->r_resend_mds) || ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { dout("choose_mds using resend_mds mds%d\n", req->r_resend_mds); return req->r_resend_mds; } if (mode == USE_RANDOM_MDS) goto random; inode = NULL; if (req->r_inode) { inode = req->r_inode; } else if (req->r_dentry) { if (req->r_dentry->d_inode) { inode = req->r_dentry->d_inode; } else { inode = req->r_dentry->d_parent->d_inode; hash = req->r_dentry->d_name.hash; is_hash = true; } } dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash, (int)hash, mode); if (!inode) goto random; ci = ceph_inode(inode); if (is_hash && S_ISDIR(inode->i_mode)) { struct ceph_inode_frag frag; int found; ceph_choose_frag(ci, hash, &frag, &found); if (found) { if (mode == USE_ANY_MDS && frag.ndist > 0) { u8 r; /* choose a random replica */ get_random_bytes(&r, 1); r %= frag.ndist; mds = frag.dist[r]; dout("choose_mds %p %llx.%llx " "frag %u mds%d (%d/%d)\n", inode, ceph_vinop(inode), frag.frag, frag.mds, (int)r, frag.ndist); return mds; } /* since this file/dir wasn't known to be * replicated, then we want to look for the * authoritative mds. */ mode = USE_AUTH_MDS; if (frag.mds >= 0) { /* choose auth mds */ mds = frag.mds; dout("choose_mds %p %llx.%llx " "frag %u mds%d (auth)\n", inode, ceph_vinop(inode), frag.frag, mds); return mds; } } } spin_lock(&inode->i_lock); cap = NULL; if (mode == USE_AUTH_MDS) cap = ci->i_auth_cap; if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); if (!cap) { spin_unlock(&inode->i_lock); goto random; } mds = cap->session->s_mds; dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n", inode, ceph_vinop(inode), mds, cap == ci->i_auth_cap ? "auth " : "", cap); spin_unlock(&inode->i_lock); return mds; random: mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); dout("choose_mds chose random mds%d\n", mds); return mds; } /* * session messages */ static struct ceph_msg *create_session_msg(u32 op, u64 seq) { struct ceph_msg *msg; struct ceph_mds_session_head *h; msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), 0, 0, NULL); if (IS_ERR(msg)) { pr_err("create_session_msg ENOMEM creating msg\n"); return ERR_PTR(PTR_ERR(msg)); } h = msg->front.iov_base; h->op = cpu_to_le32(op); h->seq = cpu_to_le64(seq); return msg; } /* * send session open request. * * called under mdsc->mutex */ static int __open_session(struct ceph_mds_client *mdsc, struct ceph_mds_session *session) { struct ceph_msg *msg; int mstate; int mds = session->s_mds; int err = 0; /* wait for mds to go active? */ mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); dout("open_session to mds%d (%s)\n", mds, ceph_mds_state_name(mstate)); session->s_state = CEPH_MDS_SESSION_OPENING; session->s_renew_requested = jiffies; /* send connect message */ msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq); if (IS_ERR(msg)) { err = PTR_ERR(msg); goto out; } ceph_con_send(&session->s_con, msg); out: return 0; } /* * session caps */ /* * Free preallocated cap messages assigned to this session */ static void cleanup_cap_releases(struct ceph_mds_session *session) { struct ceph_msg *msg; spin_lock(&session->s_cap_lock); while (!list_empty(&session->s_cap_releases)) { msg = list_first_entry(&session->s_cap_releases, struct ceph_msg, list_head); list_del_init(&msg->list_head); ceph_msg_put(msg); } while (!list_empty(&session->s_cap_releases_done)) { msg = list_first_entry(&session->s_cap_releases_done, struct ceph_msg, list_head); list_del_init(&msg->list_head); ceph_msg_put(msg); } spin_unlock(&session->s_cap_lock); } /* * Helper to safely iterate over all caps associated with a session. * * caller must hold session s_mutex */ static int iterate_session_caps(struct ceph_mds_session *session, int (*cb)(struct inode *, struct ceph_cap *, void *), void *arg) { struct ceph_cap *cap, *ncap; struct inode *inode; int ret; dout("iterate_session_caps %p mds%d\n", session, session->s_mds); spin_lock(&session->s_cap_lock); list_for_each_entry_safe(cap, ncap, &session->s_caps, session_caps) { inode = igrab(&cap->ci->vfs_inode); if (!inode) continue; spin_unlock(&session->s_cap_lock); ret = cb(inode, cap, arg); iput(inode); if (ret < 0) return ret; spin_lock(&session->s_cap_lock); } spin_unlock(&session->s_cap_lock); return 0; } static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) { struct ceph_inode_info *ci = ceph_inode(inode); dout("removing cap %p, ci is %p, inode is %p\n", cap, ci, &ci->vfs_inode); ceph_remove_cap(cap); return 0; } /* * caller must hold session s_mutex */ static void remove_session_caps(struct ceph_mds_session *session) { dout("remove_session_caps on %p\n", session); iterate_session_caps(session, remove_session_caps_cb, NULL); BUG_ON(session->s_nr_caps > 0); cleanup_cap_releases(session); } /* * wake up any threads waiting on this session's caps. if the cap is * old (didn't get renewed on the client reconnect), remove it now. * * caller must hold s_mutex. */ static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, void *arg) { struct ceph_inode_info *ci = ceph_inode(inode); wake_up(&ci->i_cap_wq); if (arg) { spin_lock(&inode->i_lock); ci->i_wanted_max_size = 0; ci->i_requested_max_size = 0; spin_unlock(&inode->i_lock); } return 0; } static void wake_up_session_caps(struct ceph_mds_session *session, int reconnect) { dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); iterate_session_caps(session, wake_up_session_cb, (void *)(unsigned long)reconnect); } /* * Send periodic message to MDS renewing all currently held caps. The * ack will reset the expiration for all caps from this session. * * caller holds s_mutex */ static int send_renew_caps(struct ceph_mds_client *mdsc, struct ceph_mds_session *session) { struct ceph_msg *msg; int state; if (time_after_eq(jiffies, session->s_cap_ttl) && time_after_eq(session->s_cap_ttl, session->s_renew_requested)) pr_info("mds%d caps stale\n", session->s_mds); /* do not try to renew caps until a recovering mds has reconnected * with its clients. */ state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); if (state < CEPH_MDS_STATE_RECONNECT) { dout("send_renew_caps ignoring mds%d (%s)\n", session->s_mds, ceph_mds_state_name(state)); return 0; } dout("send_renew_caps to mds%d (%s)\n", session->s_mds, ceph_mds_state_name(state)); session->s_renew_requested = jiffies; msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, ++session->s_renew_seq); if (IS_ERR(msg)) return PTR_ERR(msg); ceph_con_send(&session->s_con, msg); return 0; } /* * Note new cap ttl, and any transition from stale -> not stale (fresh?). * * Called under session->s_mutex */ static void renewed_caps(struct ceph_mds_client *mdsc, struct ceph_mds_session *session, int is_renew) { int was_stale; int wake = 0; spin_lock(&session->s_cap_lock); was_stale = is_renew && (session->s_cap_ttl == 0 || time_after_eq(jiffies, session->s_cap_ttl)); session->s_cap_ttl = session->s_renew_requested + mdsc->mdsmap->m_session_timeout*HZ; if (was_stale) { if (time_before(jiffies, session->s_cap_ttl)) { pr_info("mds%d caps renewed\n", session->s_mds); wake = 1; } else { pr_info("mds%d caps still stale\n", session->s_mds); } } dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); spin_unlock(&session->s_cap_lock); if (wake) wake_up_session_caps(session, 0); } /* * send a session close request */ static int request_close_session(struct ceph_mds_client *mdsc, struct ceph_mds_session *session) { struct ceph_msg *msg; int err = 0; dout("request_close_session mds%d state %s seq %lld\n", session->s_mds, session_state_name(session->s_state), session->s_seq); msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq); if (IS_ERR(msg)) err = PTR_ERR(msg); else ceph_con_send(&session->s_con, msg); return err; } /* * Called with s_mutex held. */ static int __close_session(struct ceph_mds_client *mdsc, struct ceph_mds_session *session) { if (session->s_state >= CEPH_MDS_SESSION_CLOSING) return 0; session->s_state = CEPH_MDS_SESSION_CLOSING; return request_close_session(mdsc, session); } /* * Trim old(er) caps. * * Because we can't cache an inode without one or more caps, we do * this indirectly: if a cap is unused, we prune its aliases, at which * point the inode will hopefully get dropped to. * * Yes, this is a bit sloppy. Our only real goal here is to respond to * memory pressure from the MDS, though, so it needn't be perfect. */ static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) { struct ceph_mds_session *session = arg; struct ceph_inode_info *ci = ceph_inode(inode); int used, oissued, mine; if (session->s_trim_caps <= 0) return -1; spin_lock(&inode->i_lock); mine = cap->issued | cap->implemented; used = __ceph_caps_used(ci); oissued = __ceph_caps_issued_other(ci, cap); dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n", inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), ceph_cap_string(used)); if (ci->i_dirty_caps) goto out; /* dirty caps */ if ((used & ~oissued) & mine) goto out; /* we need these caps */ session->s_trim_caps--; if (oissued) { /* we aren't the only cap.. just remove us */ __ceph_remove_cap(cap, NULL); } else { /* try to drop referring dentries */ spin_unlock(&inode->i_lock); d_prune_aliases(inode); dout("trim_caps_cb %p cap %p pruned, count now %d\n", inode, cap, atomic_read(&inode->i_count)); return 0; } out: spin_unlock(&inode->i_lock); return 0; } /* * Trim session cap count down to some max number. */ static int trim_caps(struct ceph_mds_client *mdsc, struct ceph_mds_session *session, int max_caps) { int trim_caps = session->s_nr_caps - max_caps; dout("trim_caps mds%d start: %d / %d, trim %d\n", session->s_mds, session->s_nr_caps, max_caps, trim_caps); if (trim_caps > 0) { session->s_trim_caps = trim_caps; iterate_session_caps(session, trim_caps_cb, session); dout("trim_caps mds%d done: %d / %d, trimmed %d\n", session->s_mds, session->s_nr_caps, max_caps, trim_caps - session->s_trim_caps); } return 0; } /* * Allocate cap_release messages. If there is a partially full message * in the queue, try to allocate enough to cover it's remainder, so that * we can send it immediately. * * Called under s_mutex. */ static int add_cap_releases(struct ceph_mds_client *mdsc, struct ceph_mds_session *session, int extra) { struct ceph_msg *msg; struct ceph_mds_cap_release *head; int err = -ENOMEM; if (extra < 0) extra = mdsc->client->mount_args->cap_release_safety; spin_lock(&session->s_cap_lock); if (!list_empty(&session->s_cap_releases)) { msg = list_first_entry(&session->s_cap_releases, struct ceph_msg, list_head); head = msg->front.iov_base; extra += CEPH_CAPS_PER_RELEASE - le32_to_cpu(head->num); } while (session->s_num_cap_releases < session->s_nr_caps + extra) { spin_unlock(&session->s_cap_lock); msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE, 0, 0, NULL); if (!msg) goto out_unlocked; dout("add_cap_releases %p msg %p now %d\n", session, msg, (int)msg->front.iov_len); head = msg->front.iov_base; head->num = cpu_to_le32(0); msg->front.iov_len = sizeof(*head); spin_lock(&session->s_cap_lock); list_add(&msg->list_head, &session->s_cap_releases); session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE; } if (!list_empty(&session->s_cap_releases)) { msg = list_first_entry(&session->s_cap_releases, struct ceph_msg, list_head); head = msg->front.iov_base; if (head->num) { dout(" queueing non-full %p (%d)\n", msg, le32_to_cpu(head->num)); list_move_tail(&msg->list_head, &session->s_cap_releases_done); session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - le32_to_cpu(head->num); } } err = 0; spin_unlock(&session->s_cap_lock); out_unlocked: return err; } /* * flush all dirty inode data to disk. * * returns true if we've flushed through want_flush_seq */ static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq) { int mds, ret = 1; dout("check_cap_flush want %lld\n", want_flush_seq); mutex_lock(&mdsc->mutex); for (mds = 0; ret && mds < mdsc->max_sessions; mds++) { struct ceph_mds_session *session = mdsc->sessions[mds]; if (!session) continue; get_session(session); mutex_unlock(&mdsc->mutex); mutex_lock(&session->s_mutex); if (!list_empty(&session->s_cap_flushing)) { struct ceph_inode_info *ci = list_entry(session->s_cap_flushing.next, struct ceph_inode_info, i_flushing_item); struct inode *inode = &ci->vfs_inode; spin_lock(&inode->i_lock); if (ci->i_cap_flush_seq <= want_flush_seq) { dout("check_cap_flush still flushing %p " "seq %lld <= %lld to mds%d\n", inode, ci->i_cap_flush_seq, want_flush_seq, session->s_mds); ret = 0; } spin_unlock(&inode->i_lock); } mutex_unlock(&session->s_mutex); ceph_put_mds_session(session); if (!ret) return ret; mutex_lock(&mdsc->mutex); } mutex_unlock(&mdsc->mutex); dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq); return ret; } /* * called under s_mutex */ static void send_cap_releases(struct ceph_mds_client *mdsc, struct ceph_mds_session *session) { struct ceph_msg *msg; dout("send_cap_releases mds%d\n", session->s_mds); while (1) { spin_lock(&session->s_cap_lock); if (list_empty(&session->s_cap_releases_done)) break; msg = list_first_entry(&session->s_cap_releases_done, struct ceph_msg, list_head); list_del_init(&msg->list_head); spin_unlock(&session->s_cap_lock); msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); dout("send_cap_releases mds%d %p\n", session->s_mds, msg); ceph_con_send(&session->s_con, msg); } spin_unlock(&session->s_cap_lock); } /* * requests */ /* * Create an mds request. */ struct ceph_mds_request * ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) { struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); if (!req) return ERR_PTR(-ENOMEM); req->r_started = jiffies; req->r_resend_mds = -1; INIT_LIST_HEAD(&req->r_unsafe_dir_item); req->r_fmode = -1; kref_init(&req->r_kref); INIT_LIST_HEAD(&req->r_wait); init_completion(&req->r_completion); init_completion(&req->r_safe_completion); INIT_LIST_HEAD(&req->r_unsafe_item); req->r_op = op; req->r_direct_mode = mode; return req; } /* * return oldest (lowest) tid in request tree, 0 if none. * * called under mdsc->mutex. */ static u64 __get_oldest_tid(struct ceph_mds_client *mdsc) { struct ceph_mds_request *first; if (radix_tree_gang_lookup(&mdsc->request_tree, (void **)&first, 0, 1) <= 0) return 0; return first->r_tid; } /* * Build a dentry's path. Allocate on heap; caller must kfree. Based * on build_path_from_dentry in fs/cifs/dir.c. * * If @stop_on_nosnap, generate path relative to the first non-snapped * inode. * * Encode hidden .snap dirs as a double /, i.e. * foo/.snap/bar -> foo//bar */ char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, int stop_on_nosnap) { struct dentry *temp; char *path; int len, pos; if (dentry == NULL) return ERR_PTR(-EINVAL); retry: len = 0; for (temp = dentry; !IS_ROOT(temp);) { struct inode *inode = temp->d_inode; if (inode && ceph_snap(inode) == CEPH_SNAPDIR) len++; /* slash only */ else if (stop_on_nosnap && inode && ceph_snap(inode) == CEPH_NOSNAP) break; else len += 1 + temp->d_name.len; temp = temp->d_parent; if (temp == NULL) { pr_err("build_path_dentry corrupt dentry %p\n", dentry); return ERR_PTR(-EINVAL); } } if (len) len--; /* no leading '/' */ path = kmalloc(len+1, GFP_NOFS); if (path == NULL) return ERR_PTR(-ENOMEM); pos = len; path[pos] = 0; /* trailing null */ for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { struct inode *inode = temp->d_inode; if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { dout("build_path_dentry path+%d: %p SNAPDIR\n", pos, temp); } else if (stop_on_nosnap && inode && ceph_snap(inode) == CEPH_NOSNAP) { break; } else { pos -= temp->d_name.len; if (pos < 0) break; strncpy(path + pos, temp->d_name.name, temp->d_name.len); dout("build_path_dentry path+%d: %p '%.*s'\n", pos, temp, temp->d_name.len, path + pos); } if (pos) path[--pos] = '/'; temp = temp->d_parent; if (temp == NULL) { pr_err("build_path_dentry corrupt dentry\n"); kfree(path); return ERR_PTR(-EINVAL); } } if (pos != 0) { pr_err("build_path_dentry did not end path lookup where " "expected, namelen is %d, pos is %d\n", len, pos); /* presumably this is only possible if racing with a rename of one of the parent directories (we can not lock the dentries above us to prevent this, but retrying should be harmless) */ kfree(path); goto retry; } *base = ceph_ino(temp->d_inode); *plen = len; dout("build_path_dentry on %p %d built %llx '%.*s'\n", dentry, atomic_read(&dentry->d_count), *base, len, path); return path; } static int build_dentry_path(struct dentry *dentry, const char **ppath, int *ppathlen, u64 *pino, int *pfreepath) { char *path; if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) { *pino = ceph_ino(dentry->d_parent->d_inode); *ppath = dentry->d_name.name; *ppathlen = dentry->d_name.len; return 0; } path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); if (IS_ERR(path)) return PTR_ERR(path); *ppath = path; *pfreepath = 1; return 0; } static int build_inode_path(struct inode *inode, const char **ppath, int *ppathlen, u64 *pino, int *pfreepath) { struct dentry *dentry; char *path; if (ceph_snap(inode) == CEPH_NOSNAP) { *pino = ceph_ino(inode); *ppathlen = 0; return 0; } dentry = d_find_alias(inode); path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); dput(dentry); if (IS_ERR(path)) return PTR_ERR(path); *ppath = path; *pfreepath = 1; return 0; } /* * request arguments may be specified via an inode *, a dentry *, or * an explicit ino+path. */ static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, const char *rpath, u64 rino, const char **ppath, int *pathlen, u64 *ino, int *freepath) { int r = 0; if (rinode) { r = build_inode_path(rinode, ppath, pathlen, ino, freepath); dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), ceph_snap(rinode)); } else if (rdentry) { r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath); dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, *ppath); } else if (rpath) { *ino = rino; *ppath = rpath; *pathlen = strlen(rpath); dout(" path %.*s\n", *pathlen, rpath); } return r; } /* * called under mdsc->mutex */ static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, struct ceph_mds_request *req, int mds) { struct ceph_msg *msg; struct ceph_mds_request_head *head; const char *path1 = NULL; const char *path2 = NULL; u64 ino1 = 0, ino2 = 0; int pathlen1 = 0, pathlen2 = 0; int freepath1 = 0, freepath2 = 0; int len; u16 releases; void *p, *end; int ret; ret = set_request_path_attr(req->r_inode, req->r_dentry, req->r_path1, req->r_ino1.ino, &path1, &pathlen1, &ino1, &freepath1); if (ret < 0) { msg = ERR_PTR(ret); goto out; } ret = set_request_path_attr(NULL, req->r_old_dentry, req->r_path2, req->r_ino2.ino, &path2, &pathlen2, &ino2, &freepath2); if (ret < 0) { msg = ERR_PTR(ret); goto out_free1; } len = sizeof(*head) + pathlen1 + pathlen2 + 2*(sizeof(u32) + sizeof(u64)); /* calculate (max) length for cap releases */ len += sizeof(struct ceph_mds_request_release) * (!!req->r_inode_drop + !!req->r_dentry_drop + !!req->r_old_inode_drop + !!req->r_old_dentry_drop); if (req->r_dentry_drop) len += req->r_dentry->d_name.len; if (req->r_old_dentry_drop) len += req->r_old_dentry->d_name.len; msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, 0, 0, NULL); if (IS_ERR(msg)) goto out_free2; head = msg->front.iov_base; p = msg->front.iov_base + sizeof(*head); end = msg->front.iov_base + msg->front.iov_len; head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); head->op = cpu_to_le32(req->r_op); head->caller_uid = cpu_to_le32(current_fsuid()); head->caller_gid = cpu_to_le32(current_fsgid()); head->args = req->r_args; ceph_encode_filepath(&p, end, ino1, path1); ceph_encode_filepath(&p, end, ino2, path2); /* cap releases */ releases = 0; if (req->r_inode_drop) releases += ceph_encode_inode_release(&p, req->r_inode ? req->r_inode : req->r_dentry->d_inode, mds, req->r_inode_drop, req->r_inode_unless, 0); if (req->r_dentry_drop) releases += ceph_encode_dentry_release(&p, req->r_dentry, mds, req->r_dentry_drop, req->r_dentry_unless); if (req->r_old_dentry_drop) releases += ceph_encode_dentry_release(&p, req->r_old_dentry, mds, req->r_old_dentry_drop, req->r_old_dentry_unless); if (req->r_old_inode_drop) releases += ceph_encode_inode_release(&p, req->r_old_dentry->d_inode, mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); head->num_releases = cpu_to_le16(releases); BUG_ON(p > end); msg->front.iov_len = p - msg->front.iov_base; msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); msg->pages = req->r_pages; msg->nr_pages = req->r_num_pages; msg->hdr.data_len = cpu_to_le32(req->r_data_len); msg->hdr.data_off = cpu_to_le16(0); out_free2: if (freepath2) kfree((char *)path2); out_free1: if (freepath1) kfree((char *)path1); out: return msg; } /* * called under mdsc->mutex if error, under no mutex if * success. */ static void complete_request(struct ceph_mds_client *mdsc, struct ceph_mds_request *req) { if (req->r_callback) req->r_callback(mdsc, req); else complete(&req->r_completion); } /* * called under mdsc->mutex */ static int __prepare_send_request(struct ceph_mds_client *mdsc, struct ceph_mds_request *req, int mds) { struct ceph_mds_request_head *rhead; struct ceph_msg *msg; int flags = 0; req->r_mds = mds; req->r_attempts++; dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); if (req->r_request) { ceph_msg_put(req->r_request); req->r_request = NULL; } msg = create_request_message(mdsc, req, mds); if (IS_ERR(msg)) { req->r_reply = ERR_PTR(PTR_ERR(msg)); complete_request(mdsc, req); return -PTR_ERR(msg); } req->r_request = msg; rhead = msg->front.iov_base; rhead->tid = cpu_to_le64(req->r_tid); rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); if (req->r_got_unsafe) flags |= CEPH_MDS_FLAG_REPLAY; if (req->r_locked_dir) flags |= CEPH_MDS_FLAG_WANT_DENTRY; rhead->flags = cpu_to_le32(flags); rhead->num_fwd = req->r_num_fwd; rhead->num_retry = req->r_attempts - 1; dout(" r_locked_dir = %p\n", req->r_locked_dir); if (req->r_target_inode && req->r_got_unsafe) rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); else rhead->ino = 0; return 0; } /* * send request, or put it on the appropriate wait list. */ static int __do_request(struct ceph_mds_client *mdsc, struct ceph_mds_request *req) { struct ceph_mds_session *session = NULL; int mds = -1; int err = -EAGAIN; if (req->r_reply) goto out; if (req->r_timeout && time_after_eq(jiffies, req->r_started + req->r_timeout)) { dout("do_request timed out\n"); err = -EIO; goto finish; } mds = __choose_mds(mdsc, req); if (mds < 0 || ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { dout("do_request no mds or not active, waiting for map\n"); list_add(&req->r_wait, &mdsc->waiting_for_map); goto out; } /* get, open session */ session = __ceph_lookup_mds_session(mdsc, mds); if (!session) session = register_session(mdsc, mds); dout("do_request mds%d session %p state %s\n", mds, session, session_state_name(session->s_state)); if (session->s_state != CEPH_MDS_SESSION_OPEN && session->s_state != CEPH_MDS_SESSION_HUNG) { if (session->s_state == CEPH_MDS_SESSION_NEW || session->s_state == CEPH_MDS_SESSION_CLOSING) __open_session(mdsc, session); list_add(&req->r_wait, &session->s_waiting); goto out_session; } /* send request */ req->r_session = get_session(session); req->r_resend_mds = -1; /* forget any previous mds hint */ if (req->r_request_started == 0) /* note request start time */ req->r_request_started = jiffies; err = __prepare_send_request(mdsc, req, mds); if (!err) { ceph_msg_get(req->r_request); ceph_con_send(&session->s_con, req->r_request); } out_session: ceph_put_mds_session(session); out: return err; finish: req->r_reply = ERR_PTR(err); complete_request(mdsc, req); goto out; } /* * called under mdsc->mutex */ static void __wake_requests(struct ceph_mds_client *mdsc, struct list_head *head) { struct ceph_mds_request *req, *nreq; list_for_each_entry_safe(req, nreq, head, r_wait) { list_del_init(&req->r_wait); __do_request(mdsc, req); } } /* * Wake up threads with requests pending for @mds, so that they can * resubmit their requests to a possibly different mds. If @all is set, * wake up if their requests has been forwarded to @mds, too. */ static void kick_requests(struct ceph_mds_client *mdsc, int mds, int all) { struct ceph_mds_request *reqs[10]; u64 nexttid = 0; int i, got; dout("kick_requests mds%d\n", mds); while (nexttid <= mdsc->last_tid) { got = radix_tree_gang_lookup(&mdsc->request_tree, (void **)&reqs, nexttid, 10); if (got == 0) break; nexttid = reqs[got-1]->r_tid + 1; for (i = 0; i < got; i++) { if (reqs[i]->r_got_unsafe) continue; if (reqs[i]->r_session && reqs[i]->r_session->s_mds == mds) { dout(" kicking tid %llu\n", reqs[i]->r_tid); put_request_session(reqs[i]); __do_request(mdsc, reqs[i]); } } } } void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct ceph_mds_request *req) { dout("submit_request on %p\n", req); mutex_lock(&mdsc->mutex); __register_request(mdsc, req, NULL); __do_request(mdsc, req); mutex_unlock(&mdsc->mutex); } /* * Synchrously perform an mds request. Take care of all of the * session setup, forwarding, retry details. */ int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, struct inode *dir, struct ceph_mds_request *req) { int err; dout("do_request on %p\n", req); /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */ if (req->r_inode) ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); if (req->r_locked_dir) ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); if (req->r_old_dentry) ceph_get_cap_refs( ceph_inode(req->r_old_dentry->d_parent->d_inode), CEPH_CAP_PIN); /* issue */ mutex_lock(&mdsc->mutex); __register_request(mdsc, req, dir); __do_request(mdsc, req); /* wait */ if (!req->r_reply) { mutex_unlock(&mdsc->mutex); if (req->r_timeout) { err = (long)wait_for_completion_interruptible_timeout( &req->r_completion, req->r_timeout); if (err == 0) req->r_reply = ERR_PTR(-EIO); else if (err < 0) req->r_reply = ERR_PTR(err); } else { err = wait_for_completion_interruptible( &req->r_completion); if (err) req->r_reply = ERR_PTR(err); } mutex_lock(&mdsc->mutex); } if (IS_ERR(req->r_reply)) { err = PTR_ERR(req->r_reply); req->r_reply = NULL; /* clean up */ __unregister_request(mdsc, req); if (!list_empty(&req->r_unsafe_item)) list_del_init(&req->r_unsafe_item); complete(&req->r_safe_completion); } else if (req->r_err) { err = req->r_err; } else { err = le32_to_cpu(req->r_reply_info.head->result); } mutex_unlock(&mdsc->mutex); dout("do_request %p done, result %d\n", req, err); return err; } /* * Handle mds reply. * * We take the session mutex and parse and process the reply immediately. * This preserves the logical ordering of replies, capabilities, etc., sent * by the MDS as they are applied to our local cache. */ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) { struct ceph_mds_client *mdsc = session->s_mdsc; struct ceph_mds_request *req; struct ceph_mds_reply_head *head = msg->front.iov_base; struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ u64 tid; int err, result; int mds; if (msg->hdr.src.name.type != CEPH_ENTITY_TYPE_MDS) return; if (msg->front.iov_len < sizeof(*head)) { pr_err("mdsc_handle_reply got corrupt (short) reply\n"); ceph_msg_dump(msg); return; } /* get request, session */ tid = le64_to_cpu(head->tid); mutex_lock(&mdsc->mutex); req = __lookup_request(mdsc, tid); if (!req) { dout("handle_reply on unknown tid %llu\n", tid); mutex_unlock(&mdsc->mutex); return; } dout("handle_reply %p\n", req); mds = le64_to_cpu(msg->hdr.src.name.num); /* correct session? */ if (!req->r_session && req->r_session != session) { pr_err("mdsc_handle_reply got %llu on session mds%d" " not mds%d\n", tid, session->s_mds, req->r_session ? req->r_session->s_mds : -1); mutex_unlock(&mdsc->mutex); goto out; } /* dup? */ if ((req->r_got_unsafe && !head->safe) || (req->r_got_safe && head->safe)) { pr_warning("got a dup %s reply on %llu from mds%d\n", head->safe ? "safe" : "unsafe", tid, mds); mutex_unlock(&mdsc->mutex); goto out; } result = le32_to_cpu(head->result); /* * Tolerate 2 consecutive ESTALEs from the same mds. * FIXME: we should be looking at the cap migrate_seq. */ if (result == -ESTALE) { req->r_direct_mode = USE_AUTH_MDS; req->r_num_stale++; if (req->r_num_stale <= 2) { __do_request(mdsc, req); mutex_unlock(&mdsc->mutex); goto out; } } else { req->r_num_stale = 0; } if (head->safe) { req->r_got_safe = true; __unregister_request(mdsc, req); complete(&req->r_safe_completion); if (req->r_got_unsafe) { /* * We already handled the unsafe response, now do the * cleanup. No need to examine the response; the MDS * doesn't include any result info in the safe * response. And even if it did, there is nothing * useful we could do with a revised return value. */ dout("got safe reply %llu, mds%d\n", tid, mds); list_del_init(&req->r_unsafe_item); /* last unsafe request during umount? */ if (mdsc->stopping && !__get_oldest_tid(mdsc)) complete(&mdsc->safe_umount_waiters); mutex_unlock(&mdsc->mutex); goto out; } } BUG_ON(req->r_reply); if (!head->safe) { req->r_got_unsafe = true; list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); } dout("handle_reply tid %lld result %d\n", tid, result); rinfo = &req->r_reply_info; err = parse_reply_info(msg, rinfo); mutex_unlock(&mdsc->mutex); mutex_lock(&session->s_mutex); if (err < 0) { pr_err("mdsc_handle_reply got corrupt reply mds%d\n", mds); ceph_msg_dump(msg); goto out_err; } /* snap trace */ if (rinfo->snapblob_len) { down_write(&mdsc->snap_rwsem); ceph_update_snap_trace(mdsc, rinfo->snapblob, rinfo->snapblob + rinfo->snapblob_len, le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP); downgrade_write(&mdsc->snap_rwsem); } else { down_read(&mdsc->snap_rwsem); } /* insert trace into our cache */ err = ceph_fill_trace(mdsc->client->sb, req, req->r_session); if (err == 0) { if (result == 0 && rinfo->dir_nr) ceph_readdir_prepopulate(req, req->r_session); ceph_unreserve_caps(&req->r_caps_reservation); } up_read(&mdsc->snap_rwsem); out_err: if (err) { req->r_err = err; } else { req->r_reply = msg; ceph_msg_get(msg); } add_cap_releases(mdsc, req->r_session, -1); mutex_unlock(&session->s_mutex); /* kick calling process */ complete_request(mdsc, req); out: ceph_mdsc_put_request(req); return; } /* * handle mds notification that our request has been forwarded. */ static void handle_forward(struct ceph_mds_client *mdsc, struct ceph_msg *msg) { struct ceph_mds_request *req; u64 tid; u32 next_mds; u32 fwd_seq; u8 must_resend; int err = -EINVAL; void *p = msg->front.iov_base; void *end = p + msg->front.iov_len; int from_mds, state; if (msg->hdr.src.name.type != CEPH_ENTITY_TYPE_MDS) goto bad; from_mds = le64_to_cpu(msg->hdr.src.name.num); ceph_decode_need(&p, end, sizeof(u64)+2*sizeof(u32), bad); tid = ceph_decode_64(&p); next_mds = ceph_decode_32(&p); fwd_seq = ceph_decode_32(&p); must_resend = ceph_decode_8(&p); WARN_ON(must_resend); /* shouldn't happen. */ mutex_lock(&mdsc->mutex); req = __lookup_request(mdsc, tid); if (!req) { dout("forward %llu dne\n", tid); goto out; /* dup reply? */ } state = mdsc->sessions[next_mds]->s_state; if (fwd_seq <= req->r_num_fwd) { dout("forward %llu to mds%d - old seq %d <= %d\n", tid, next_mds, req->r_num_fwd, fwd_seq); } else { /* resend. forward race not possible; mds would drop */ dout("forward %llu to mds%d (we resend)\n", tid, next_mds); req->r_num_fwd = fwd_seq; req->r_resend_mds = next_mds; put_request_session(req); __do_request(mdsc, req); } ceph_mdsc_put_request(req); out: mutex_unlock(&mdsc->mutex); return; bad: pr_err("mdsc_handle_forward decode error err=%d\n", err); } /* * handle a mds session control message */ static void handle_session(struct ceph_mds_session *session, struct ceph_msg *msg) { struct ceph_mds_client *mdsc = session->s_mdsc; u32 op; u64 seq; int mds; struct ceph_mds_session_head *h = msg->front.iov_base; int wake = 0; if (msg->hdr.src.name.type != CEPH_ENTITY_TYPE_MDS) return; mds = le64_to_cpu(msg->hdr.src.name.num); /* decode */ if (msg->front.iov_len != sizeof(*h)) goto bad; op = le32_to_cpu(h->op); seq = le64_to_cpu(h->seq); mutex_lock(&mdsc->mutex); /* FIXME: this ttl calculation is generous */ session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; mutex_unlock(&mdsc->mutex); mutex_lock(&session->s_mutex); dout("handle_session mds%d %s %p state %s seq %llu\n", mds, ceph_session_op_name(op), session, session_state_name(session->s_state), seq); if (session->s_state == CEPH_MDS_SESSION_HUNG) { session->s_state = CEPH_MDS_SESSION_OPEN; pr_info("mds%d came back\n", session->s_mds); } switch (op) { case CEPH_SESSION_OPEN: session->s_state = CEPH_MDS_SESSION_OPEN; renewed_caps(mdsc, session, 0); wake = 1; if (mdsc->stopping) __close_session(mdsc, session); break; case CEPH_SESSION_RENEWCAPS: if (session->s_renew_seq == seq) renewed_caps(mdsc, session, 1); break; case CEPH_SESSION_CLOSE: unregister_session(mdsc, session); remove_session_caps(session); wake = 1; /* for good measure */ complete(&mdsc->session_close_waiters); kick_requests(mdsc, mds, 0); /* cur only */ break; case CEPH_SESSION_STALE: pr_info("mds%d caps went stale, renewing\n", session->s_mds); spin_lock(&session->s_cap_lock); session->s_cap_gen++; session->s_cap_ttl = 0; spin_unlock(&session->s_cap_lock); send_renew_caps(mdsc, session); break; case CEPH_SESSION_RECALL_STATE: trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); break; default: pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); WARN_ON(1); } mutex_unlock(&session->s_mutex); if (wake) { mutex_lock(&mdsc->mutex); __wake_requests(mdsc, &session->s_waiting); mutex_unlock(&mdsc->mutex); } return; bad: pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, (int)msg->front.iov_len); ceph_msg_dump(msg); return; } /* * called under session->mutex. */ static void replay_unsafe_requests(struct ceph_mds_client *mdsc, struct ceph_mds_session *session) { struct ceph_mds_request *req, *nreq; int err; dout("replay_unsafe_requests mds%d\n", session->s_mds); mutex_lock(&mdsc->mutex); list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { err = __prepare_send_request(mdsc, req, session->s_mds); if (!err) { ceph_msg_get(req->r_request); ceph_con_send(&session->s_con, req->r_request); } } mutex_unlock(&mdsc->mutex); } /* * Encode information about a cap for a reconnect with the MDS. */ struct encode_caps_data { void **pp; void *end; int *num_caps; }; static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) { struct ceph_mds_cap_reconnect *rec; struct ceph_inode_info *ci; struct encode_caps_data *data = (struct encode_caps_data *)arg; void *p = *(data->pp); void *end = data->end; char *path; int pathlen, err; u64 pathbase; struct dentry *dentry; ci = cap->ci; dout(" adding %p ino %llx.%llx cap %p %lld %s\n", inode, ceph_vinop(inode), cap, cap->cap_id, ceph_cap_string(cap->issued)); ceph_decode_need(&p, end, sizeof(u64), needmore); ceph_encode_64(&p, ceph_ino(inode)); dentry = d_find_alias(inode); if (dentry) { path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); if (IS_ERR(path)) { err = PTR_ERR(path); BUG_ON(err); } } else { path = NULL; pathlen = 0; } ceph_decode_need(&p, end, pathlen+4, needmore); ceph_encode_string(&p, end, path, pathlen); ceph_decode_need(&p, end, sizeof(*rec), needmore); rec = p; p += sizeof(*rec); BUG_ON(p > end); spin_lock(&inode->i_lock); cap->seq = 0; /* reset cap seq */ cap->issue_seq = 0; /* and issue_seq */ rec->cap_id = cpu_to_le64(cap->cap_id); rec->pathbase = cpu_to_le64(pathbase); rec->wanted = cpu_to_le32(__ceph_caps_wanted(ci)); rec->issued = cpu_to_le32(cap->issued); rec->size = cpu_to_le64(inode->i_size); ceph_encode_timespec(&rec->mtime, &inode->i_mtime); ceph_encode_timespec(&rec->atime, &inode->i_atime); rec->snaprealm = cpu_to_le64(ci->i_snap_realm->ino); spin_unlock(&inode->i_lock); kfree(path); dput(dentry); (*data->num_caps)++; *(data->pp) = p; return 0; needmore: return -ENOSPC; } /* * If an MDS fails and recovers, clients need to reconnect in order to * reestablish shared state. This includes all caps issued through * this session _and_ the snap_realm hierarchy. Because it's not * clear which snap realms the mds cares about, we send everything we * know about.. that ensures we'll then get any new info the * recovering MDS might have. * * This is a relatively heavyweight operation, but it's rare. * * called with mdsc->mutex held. */ static void send_mds_reconnect(struct ceph_mds_client *mdsc, int mds) { struct ceph_mds_session *session; struct ceph_msg *reply; int newlen, len = 4 + 1; void *p, *end; int err; int num_caps, num_realms = 0; int got; u64 next_snap_ino = 0; __le32 *pnum_caps, *pnum_realms; struct encode_caps_data iter_args; pr_info("reconnect to recovering mds%d\n", mds); /* find session */ session = __ceph_lookup_mds_session(mdsc, mds); mutex_unlock(&mdsc->mutex); /* drop lock for duration */ if (session) { mutex_lock(&session->s_mutex); session->s_state = CEPH_MDS_SESSION_RECONNECTING; session->s_seq = 0; ceph_con_open(&session->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); /* replay unsafe requests */ replay_unsafe_requests(mdsc, session); /* estimate needed space */ len += session->s_nr_caps * (100+sizeof(struct ceph_mds_cap_reconnect)); pr_info("estimating i need %d bytes for %d caps\n", len, session->s_nr_caps); } else { dout("no session for mds%d, will send short reconnect\n", mds); } down_read(&mdsc->snap_rwsem); retry: /* build reply */ reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, len, 0, 0, NULL); if (IS_ERR(reply)) { err = PTR_ERR(reply); pr_err("send_mds_reconnect ENOMEM on %d for mds%d\n", len, mds); goto out; } p = reply->front.iov_base; end = p + len; if (!session) { ceph_encode_8(&p, 1); /* session was closed */ ceph_encode_32(&p, 0); goto send; } dout("session %p state %s\n", session, session_state_name(session->s_state)); /* traverse this session's caps */ ceph_encode_8(&p, 0); pnum_caps = p; ceph_encode_32(&p, session->s_nr_caps); num_caps = 0; iter_args.pp = &p; iter_args.end = end; iter_args.num_caps = &num_caps; err = iterate_session_caps(session, encode_caps_cb, &iter_args); if (err == -ENOSPC) goto needmore; if (err < 0) goto out; *pnum_caps = cpu_to_le32(num_caps); /* * snaprealms. we provide mds with the ino, seq (version), and * parent for all of our realms. If the mds has any newer info, * it will tell us. */ next_snap_ino = 0; /* save some space for the snaprealm count */ pnum_realms = p; ceph_decode_need(&p, end, sizeof(*pnum_realms), needmore); p += sizeof(*pnum_realms); num_realms = 0; while (1) { struct ceph_snap_realm *realm; struct ceph_mds_snaprealm_reconnect *sr_rec; got = radix_tree_gang_lookup(&mdsc->snap_realms, (void **)&realm, next_snap_ino, 1); if (!got) break; dout(" adding snap realm %llx seq %lld parent %llx\n", realm->ino, realm->seq, realm->parent_ino); ceph_decode_need(&p, end, sizeof(*sr_rec), needmore); sr_rec = p; sr_rec->ino = cpu_to_le64(realm->ino); sr_rec->seq = cpu_to_le64(realm->seq); sr_rec->parent = cpu_to_le64(realm->parent_ino); p += sizeof(*sr_rec); num_realms++; next_snap_ino = realm->ino + 1; } *pnum_realms = cpu_to_le32(num_realms); send: reply->front.iov_len = p - reply->front.iov_base; reply->hdr.front_len = cpu_to_le32(reply->front.iov_len); dout("final len was %u (guessed %d)\n", (unsigned)reply->front.iov_len, len); ceph_con_send(&session->s_con, reply); if (session) { session->s_state = CEPH_MDS_SESSION_OPEN; __wake_requests(mdsc, &session->s_waiting); } out: up_read(&mdsc->snap_rwsem); if (session) { mutex_unlock(&session->s_mutex); ceph_put_mds_session(session); } mutex_lock(&mdsc->mutex); return; needmore: /* * we need a larger buffer. this doesn't very accurately * factor in snap realms, but it's safe. */ num_caps += num_realms; newlen = len * ((100 * (session->s_nr_caps+3)) / (num_caps + 1)) / 100; pr_info("i guessed %d, and did %d of %d caps, retrying with %d\n", len, num_caps, session->s_nr_caps, newlen); len = newlen; ceph_msg_put(reply); goto retry; } /* * compare old and new mdsmaps, kicking requests * and closing out old connections as necessary * * called under mdsc->mutex. */ static void check_new_map(struct ceph_mds_client *mdsc, struct ceph_mdsmap *newmap, struct ceph_mdsmap *oldmap) { int i; int oldstate, newstate; struct ceph_mds_session *s; dout("check_new_map new %u old %u\n", newmap->m_epoch, oldmap->m_epoch); for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) { if (mdsc->sessions[i] == NULL) continue; s = mdsc->sessions[i]; oldstate = ceph_mdsmap_get_state(oldmap, i); newstate = ceph_mdsmap_get_state(newmap, i); dout("check_new_map mds%d state %s -> %s (session %s)\n", i, ceph_mds_state_name(oldstate), ceph_mds_state_name(newstate), session_state_name(s->s_state)); if (memcmp(ceph_mdsmap_get_addr(oldmap, i), ceph_mdsmap_get_addr(newmap, i), sizeof(struct ceph_entity_addr))) { if (s->s_state == CEPH_MDS_SESSION_OPENING) { /* the session never opened, just close it * out now */ __wake_requests(mdsc, &s->s_waiting); unregister_session(mdsc, s); } else { /* just close it */ mutex_unlock(&mdsc->mutex); mutex_lock(&s->s_mutex); mutex_lock(&mdsc->mutex); ceph_con_close(&s->s_con); mutex_unlock(&s->s_mutex); s->s_state = CEPH_MDS_SESSION_RESTARTING; } /* kick any requests waiting on the recovering mds */ kick_requests(mdsc, i, 1); } else if (oldstate == newstate) { continue; /* nothing new with this mds */ } /* * send reconnect? */ if (s->s_state == CEPH_MDS_SESSION_RESTARTING && newstate >= CEPH_MDS_STATE_RECONNECT) send_mds_reconnect(mdsc, i); /* * kick requests on any mds that has gone active. * * kick requests on cur or forwarder: we may have sent * the request to mds1, mds1 told us it forwarded it * to mds2, but then we learn mds1 failed and can't be * sure it successfully forwarded our request before * it died. */ if (oldstate < CEPH_MDS_STATE_ACTIVE && newstate >= CEPH_MDS_STATE_ACTIVE) { pr_info("mds%d reconnect completed\n", s->s_mds); kick_requests(mdsc, i, 1); ceph_kick_flushing_caps(mdsc, s); wake_up_session_caps(s, 1); } } } /* * leases */ /* * caller must hold session s_mutex, dentry->d_lock */ void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) { struct ceph_dentry_info *di = ceph_dentry(dentry); ceph_put_mds_session(di->lease_session); di->lease_session = NULL; } static void handle_lease(struct ceph_mds_client *mdsc, struct ceph_msg *msg) { struct super_block *sb = mdsc->client->sb; struct inode *inode; struct ceph_mds_session *session; struct ceph_inode_info *ci; struct dentry *parent, *dentry; struct ceph_dentry_info *di; int mds; struct ceph_mds_lease *h = msg->front.iov_base; struct ceph_vino vino; int mask; struct qstr dname; int release = 0; if (msg->hdr.src.name.type != CEPH_ENTITY_TYPE_MDS) return; mds = le64_to_cpu(msg->hdr.src.name.num); dout("handle_lease from mds%d\n", mds); /* decode */ if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) goto bad; vino.ino = le64_to_cpu(h->ino); vino.snap = CEPH_NOSNAP; mask = le16_to_cpu(h->mask); dname.name = (void *)h + sizeof(*h) + sizeof(u32); dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); if (dname.len != get_unaligned_le32(h+1)) goto bad; /* find session */ mutex_lock(&mdsc->mutex); session = __ceph_lookup_mds_session(mdsc, mds); mutex_unlock(&mdsc->mutex); if (!session) { pr_err("handle_lease got lease but no session mds%d\n", mds); return; } mutex_lock(&session->s_mutex); session->s_seq++; /* lookup inode */ inode = ceph_find_inode(sb, vino); dout("handle_lease '%s', mask %d, ino %llx %p\n", ceph_lease_op_name(h->action), mask, vino.ino, inode); if (inode == NULL) { dout("handle_lease no inode %llx\n", vino.ino); goto release; } ci = ceph_inode(inode); /* dentry */ parent = d_find_alias(inode); if (!parent) { dout("no parent dentry on inode %p\n", inode); WARN_ON(1); goto release; /* hrm... */ } dname.hash = full_name_hash(dname.name, dname.len); dentry = d_lookup(parent, &dname); dput(parent); if (!dentry) goto release; spin_lock(&dentry->d_lock); di = ceph_dentry(dentry); switch (h->action) { case CEPH_MDS_LEASE_REVOKE: if (di && di->lease_session == session) { h->seq = cpu_to_le32(di->lease_seq); __ceph_mdsc_drop_dentry_lease(dentry); } release = 1; break; case CEPH_MDS_LEASE_RENEW: if (di && di->lease_session == session && di->lease_gen == session->s_cap_gen && di->lease_renew_from && di->lease_renew_after == 0) { unsigned long duration = le32_to_cpu(h->duration_ms) * HZ / 1000; di->lease_seq = le32_to_cpu(h->seq); dentry->d_time = di->lease_renew_from + duration; di->lease_renew_after = di->lease_renew_from + (duration >> 1); di->lease_renew_from = 0; } break; } spin_unlock(&dentry->d_lock); dput(dentry); if (!release) goto out; release: /* let's just reuse the same message */ h->action = CEPH_MDS_LEASE_REVOKE_ACK; ceph_msg_get(msg); ceph_con_send(&session->s_con, msg); out: iput(inode); mutex_unlock(&session->s_mutex); ceph_put_mds_session(session); return; bad: pr_err("corrupt lease message\n"); ceph_msg_dump(msg); } void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, struct inode *inode, struct dentry *dentry, char action, u32 seq) { struct ceph_msg *msg; struct ceph_mds_lease *lease; int len = sizeof(*lease) + sizeof(u32); int dnamelen = 0; dout("lease_send_msg inode %p dentry %p %s to mds%d\n", inode, dentry, ceph_lease_op_name(action), session->s_mds); dnamelen = dentry->d_name.len; len += dnamelen; msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, 0, 0, NULL); if (IS_ERR(msg)) return; lease = msg->front.iov_base; lease->action = action; lease->mask = cpu_to_le16(CEPH_LOCK_DN); lease->ino = cpu_to_le64(ceph_vino(inode).ino); lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); lease->seq = cpu_to_le32(seq); put_unaligned_le32(dnamelen, lease + 1); memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); /* * if this is a preemptive lease RELEASE, no need to * flush request stream, since the actual request will * soon follow. */ msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); ceph_con_send(&session->s_con, msg); } /* * Preemptively release a lease we expect to invalidate anyway. * Pass @inode always, @dentry is optional. */ void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode, struct dentry *dentry, int mask) { struct ceph_dentry_info *di; struct ceph_mds_session *session; u32 seq; BUG_ON(inode == NULL); BUG_ON(dentry == NULL); BUG_ON(mask != CEPH_LOCK_DN); /* is dentry lease valid? */ spin_lock(&dentry->d_lock); di = ceph_dentry(dentry); if (!di || !di->lease_session || di->lease_session->s_mds < 0 || di->lease_gen != di->lease_session->s_cap_gen || !time_before(jiffies, dentry->d_time)) { dout("lease_release inode %p dentry %p -- " "no lease on %d\n", inode, dentry, mask); spin_unlock(&dentry->d_lock); return; } /* we do have a lease on this dentry; note mds and seq */ session = ceph_get_mds_session(di->lease_session); seq = di->lease_seq; __ceph_mdsc_drop_dentry_lease(dentry); spin_unlock(&dentry->d_lock); dout("lease_release inode %p dentry %p mask %d to mds%d\n", inode, dentry, mask, session->s_mds); ceph_mdsc_lease_send_msg(session, inode, dentry, CEPH_MDS_LEASE_RELEASE, seq); ceph_put_mds_session(session); } /* * drop all leases (and dentry refs) in preparation for umount */ static void drop_leases(struct ceph_mds_client *mdsc) { int i; dout("drop_leases\n"); mutex_lock(&mdsc->mutex); for (i = 0; i < mdsc->max_sessions; i++) { struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); if (!s) continue; mutex_unlock(&mdsc->mutex); mutex_lock(&s->s_mutex); mutex_unlock(&s->s_mutex); ceph_put_mds_session(s); mutex_lock(&mdsc->mutex); } mutex_unlock(&mdsc->mutex); } /* * delayed work -- periodically trim expired leases, renew caps with mds */ static void schedule_delayed(struct ceph_mds_client *mdsc) { int delay = 5; unsigned hz = round_jiffies_relative(HZ * delay); schedule_delayed_work(&mdsc->delayed_work, hz); } static void delayed_work(struct work_struct *work) { int i; struct ceph_mds_client *mdsc = container_of(work, struct ceph_mds_client, delayed_work.work); int renew_interval; int renew_caps; dout("mdsc delayed_work\n"); ceph_check_delayed_caps(mdsc); mutex_lock(&mdsc->mutex); renew_interval = mdsc->mdsmap->m_session_timeout >> 2; renew_caps = time_after_eq(jiffies, HZ*renew_interval + mdsc->last_renew_caps); if (renew_caps) mdsc->last_renew_caps = jiffies; for (i = 0; i < mdsc->max_sessions; i++) { struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); if (s == NULL) continue; if (s->s_state == CEPH_MDS_SESSION_CLOSING) { dout("resending session close request for mds%d\n", s->s_mds); request_close_session(mdsc, s); ceph_put_mds_session(s); continue; } if (s->s_ttl && time_after(jiffies, s->s_ttl)) { if (s->s_state == CEPH_MDS_SESSION_OPEN) { s->s_state = CEPH_MDS_SESSION_HUNG; pr_info("mds%d hung\n", s->s_mds); } } if (s->s_state < CEPH_MDS_SESSION_OPEN) { /* this mds is failed or recovering, just wait */ ceph_put_mds_session(s); continue; } mutex_unlock(&mdsc->mutex); mutex_lock(&s->s_mutex); if (renew_caps) send_renew_caps(mdsc, s); else ceph_con_keepalive(&s->s_con); add_cap_releases(mdsc, s, -1); send_cap_releases(mdsc, s); mutex_unlock(&s->s_mutex); ceph_put_mds_session(s); mutex_lock(&mdsc->mutex); } mutex_unlock(&mdsc->mutex); schedule_delayed(mdsc); } int ceph_mdsc_init(struct ceph_mds_client *mdsc, struct ceph_client *client) { mdsc->client = client; mutex_init(&mdsc->mutex); mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); init_completion(&mdsc->safe_umount_waiters); init_completion(&mdsc->session_close_waiters); INIT_LIST_HEAD(&mdsc->waiting_for_map); mdsc->sessions = NULL; mdsc->max_sessions = 0; mdsc->stopping = 0; init_rwsem(&mdsc->snap_rwsem); INIT_RADIX_TREE(&mdsc->snap_realms, GFP_NOFS); INIT_LIST_HEAD(&mdsc->snap_empty); spin_lock_init(&mdsc->snap_empty_lock); mdsc->last_tid = 0; INIT_RADIX_TREE(&mdsc->request_tree, GFP_NOFS); INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); mdsc->last_renew_caps = jiffies; INIT_LIST_HEAD(&mdsc->cap_delay_list); spin_lock_init(&mdsc->cap_delay_lock); INIT_LIST_HEAD(&mdsc->snap_flush_list); spin_lock_init(&mdsc->snap_flush_lock); mdsc->cap_flush_seq = 0; INIT_LIST_HEAD(&mdsc->cap_dirty); mdsc->num_cap_flushing = 0; spin_lock_init(&mdsc->cap_dirty_lock); init_waitqueue_head(&mdsc->cap_flushing_wq); spin_lock_init(&mdsc->dentry_lru_lock); INIT_LIST_HEAD(&mdsc->dentry_lru); return 0; } /* * Wait for safe replies on open mds requests. If we time out, drop * all requests from the tree to avoid dangling dentry refs. */ static void wait_requests(struct ceph_mds_client *mdsc) { struct ceph_mds_request *req; struct ceph_client *client = mdsc->client; mutex_lock(&mdsc->mutex); if (__get_oldest_tid(mdsc)) { mutex_unlock(&mdsc->mutex); dout("wait_requests waiting for requests\n"); wait_for_completion_timeout(&mdsc->safe_umount_waiters, client->mount_args->mount_timeout * HZ); mutex_lock(&mdsc->mutex); /* tear down remaining requests */ while (radix_tree_gang_lookup(&mdsc->request_tree, (void **)&req, 0, 1)) { dout("wait_requests timed out on tid %llu\n", req->r_tid); radix_tree_delete(&mdsc->request_tree, req->r_tid); ceph_mdsc_put_request(req); } } mutex_unlock(&mdsc->mutex); dout("wait_requests done\n"); } /* * called before mount is ro, and before dentries are torn down. * (hmm, does this still race with new lookups?) */ void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) { dout("pre_umount\n"); mdsc->stopping = 1; drop_leases(mdsc); ceph_flush_dirty_caps(mdsc); wait_requests(mdsc); } /* * wait for all write mds requests to flush. */ static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) { struct ceph_mds_request *req; u64 next_tid = 0; int got; mutex_lock(&mdsc->mutex); dout("wait_unsafe_requests want %lld\n", want_tid); while (1) { got = radix_tree_gang_lookup(&mdsc->request_tree, (void **)&req, next_tid, 1); if (!got) break; if (req->r_tid > want_tid) break; next_tid = req->r_tid + 1; if ((req->r_op & CEPH_MDS_OP_WRITE) == 0) continue; /* not a write op */ ceph_mdsc_get_request(req); mutex_unlock(&mdsc->mutex); dout("wait_unsafe_requests wait on %llu (want %llu)\n", req->r_tid, want_tid); wait_for_completion(&req->r_safe_completion); mutex_lock(&mdsc->mutex); ceph_mdsc_put_request(req); } mutex_unlock(&mdsc->mutex); dout("wait_unsafe_requests done\n"); } void ceph_mdsc_sync(struct ceph_mds_client *mdsc) { u64 want_tid, want_flush; dout("sync\n"); mutex_lock(&mdsc->mutex); want_tid = mdsc->last_tid; want_flush = mdsc->cap_flush_seq; mutex_unlock(&mdsc->mutex); dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush); ceph_flush_dirty_caps(mdsc); wait_unsafe_requests(mdsc, want_tid); wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush)); } /* * called after sb is ro. */ void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) { struct ceph_mds_session *session; int i; int n; struct ceph_client *client = mdsc->client; unsigned long started, timeout = client->mount_args->mount_timeout * HZ; dout("close_sessions\n"); mutex_lock(&mdsc->mutex); /* close sessions */ started = jiffies; while (time_before(jiffies, started + timeout)) { dout("closing sessions\n"); n = 0; for (i = 0; i < mdsc->max_sessions; i++) { session = __ceph_lookup_mds_session(mdsc, i); if (!session) continue; mutex_unlock(&mdsc->mutex); mutex_lock(&session->s_mutex); __close_session(mdsc, session); mutex_unlock(&session->s_mutex); ceph_put_mds_session(session); mutex_lock(&mdsc->mutex); n++; } if (n == 0) break; if (client->mount_state == CEPH_MOUNT_SHUTDOWN) break; dout("waiting for sessions to close\n"); mutex_unlock(&mdsc->mutex); wait_for_completion_timeout(&mdsc->session_close_waiters, timeout); mutex_lock(&mdsc->mutex); } /* tear down remaining sessions */ for (i = 0; i < mdsc->max_sessions; i++) { if (mdsc->sessions[i]) { session = get_session(mdsc->sessions[i]); unregister_session(mdsc, session); mutex_unlock(&mdsc->mutex); mutex_lock(&session->s_mutex); remove_session_caps(session); mutex_unlock(&session->s_mutex); ceph_put_mds_session(session); mutex_lock(&mdsc->mutex); } } WARN_ON(!list_empty(&mdsc->cap_delay_list)); mutex_unlock(&mdsc->mutex); ceph_cleanup_empty_realms(mdsc); cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ dout("stopped\n"); } void ceph_mdsc_stop(struct ceph_mds_client *mdsc) { dout("stop\n"); cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ if (mdsc->mdsmap) ceph_mdsmap_destroy(mdsc->mdsmap); kfree(mdsc->sessions); } /* * handle mds map update. */ void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg) { u32 epoch; u32 maplen; void *p = msg->front.iov_base; void *end = p + msg->front.iov_len; struct ceph_mdsmap *newmap, *oldmap; struct ceph_fsid fsid; int err = -EINVAL; ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); ceph_decode_copy(&p, &fsid, sizeof(fsid)); if (ceph_check_fsid(mdsc->client, &fsid) < 0) return; epoch = ceph_decode_32(&p); maplen = ceph_decode_32(&p); dout("handle_map epoch %u len %d\n", epoch, (int)maplen); /* do we need it? */ ceph_monc_got_mdsmap(&mdsc->client->monc, epoch); mutex_lock(&mdsc->mutex); if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { dout("handle_map epoch %u <= our %u\n", epoch, mdsc->mdsmap->m_epoch); mutex_unlock(&mdsc->mutex); return; } newmap = ceph_mdsmap_decode(&p, end); if (IS_ERR(newmap)) { err = PTR_ERR(newmap); goto bad_unlock; } /* swap into place */ if (mdsc->mdsmap) { oldmap = mdsc->mdsmap; mdsc->mdsmap = newmap; check_new_map(mdsc, newmap, oldmap); ceph_mdsmap_destroy(oldmap); } else { mdsc->mdsmap = newmap; /* first mds map */ } mdsc->client->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; __wake_requests(mdsc, &mdsc->waiting_for_map); mutex_unlock(&mdsc->mutex); schedule_delayed(mdsc); return; bad_unlock: mutex_unlock(&mdsc->mutex); bad: pr_err("error decoding mdsmap %d\n", err); return; } static struct ceph_connection *con_get(struct ceph_connection *con) { struct ceph_mds_session *s = con->private; if (get_session(s)) { dout("mdsc con_get %p %d -> %d\n", s, atomic_read(&s->s_ref) - 1, atomic_read(&s->s_ref)); return con; } dout("mdsc con_get %p FAIL\n", s); return NULL; } static void con_put(struct ceph_connection *con) { struct ceph_mds_session *s = con->private; dout("mdsc con_put %p %d -> %d\n", s, atomic_read(&s->s_ref), atomic_read(&s->s_ref) - 1); ceph_put_mds_session(s); } /* * if the client is unresponsive for long enough, the mds will kill * the session entirely. */ static void peer_reset(struct ceph_connection *con) { struct ceph_mds_session *s = con->private; pr_err("mds%d gave us the boot. IMPLEMENT RECONNECT.\n", s->s_mds); } static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) { struct ceph_mds_session *s = con->private; struct ceph_mds_client *mdsc = s->s_mdsc; int type = le16_to_cpu(msg->hdr.type); switch (type) { case CEPH_MSG_MDS_MAP: ceph_mdsc_handle_map(mdsc, msg); break; case CEPH_MSG_CLIENT_SESSION: handle_session(s, msg); break; case CEPH_MSG_CLIENT_REPLY: handle_reply(s, msg); break; case CEPH_MSG_CLIENT_REQUEST_FORWARD: handle_forward(mdsc, msg); break; case CEPH_MSG_CLIENT_CAPS: ceph_handle_caps(s, msg); break; case CEPH_MSG_CLIENT_SNAP: ceph_handle_snap(mdsc, msg); break; case CEPH_MSG_CLIENT_LEASE: handle_lease(mdsc, msg); break; default: pr_err("received unknown message type %d %s\n", type, ceph_msg_type_name(type)); } ceph_msg_put(msg); } /* * authentication */ static int get_authorizer(struct ceph_connection *con, void **buf, int *len, int *proto, void **reply_buf, int *reply_len, int force_new) { struct ceph_mds_session *s = con->private; struct ceph_mds_client *mdsc = s->s_mdsc; struct ceph_auth_client *ac = mdsc->client->monc.auth; int ret = 0; if (force_new && s->s_authorizer) { ac->ops->destroy_authorizer(ac, s->s_authorizer); s->s_authorizer = NULL; } if (s->s_authorizer == NULL) { if (ac->ops->create_authorizer) { ret = ac->ops->create_authorizer( ac, CEPH_ENTITY_TYPE_MDS, &s->s_authorizer, &s->s_authorizer_buf, &s->s_authorizer_buf_len, &s->s_authorizer_reply_buf, &s->s_authorizer_reply_buf_len); if (ret) return ret; } } *proto = ac->protocol; *buf = s->s_authorizer_buf; *len = s->s_authorizer_buf_len; *reply_buf = s->s_authorizer_reply_buf; *reply_len = s->s_authorizer_reply_buf_len; return 0; } static int verify_authorizer_reply(struct ceph_connection *con, int len) { struct ceph_mds_session *s = con->private; struct ceph_mds_client *mdsc = s->s_mdsc; struct ceph_auth_client *ac = mdsc->client->monc.auth; return ac->ops->verify_authorizer_reply(ac, s->s_authorizer, len); } const static struct ceph_connection_operations mds_con_ops = { .get = con_get, .put = con_put, .dispatch = dispatch, .get_authorizer = get_authorizer, .verify_authorizer_reply = verify_authorizer_reply, .peer_reset = peer_reset, .alloc_msg = ceph_alloc_msg, .alloc_middle = ceph_alloc_middle, }; /* eof */