| #include <linux/ceph/ceph_debug.h> |
| |
| #include <linux/fs.h> |
| #include <linux/wait.h> |
| #include <linux/slab.h> |
| #include <linux/sched.h> |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| |
| #include "super.h" |
| #include "mds_client.h" |
| |
| #include <linux/ceph/messenger.h> |
| #include <linux/ceph/decode.h> |
| #include <linux/ceph/pagelist.h> |
| #include <linux/ceph/auth.h> |
| #include <linux/ceph/debugfs.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| * are no longer valid. |
| */ |
| |
| struct ceph_reconnect_state { |
| struct ceph_pagelist *pagelist; |
| bool flock; |
| }; |
| |
| static void __wake_requests(struct ceph_mds_client *mdsc, |
| struct list_head *head); |
| |
| static const 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 features) |
| { |
| 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; |
| |
| if (features & CEPH_FEATURE_DIRLAYOUTHASH) |
| ceph_decode_copy_safe(p, end, &info->dir_layout, |
| sizeof(info->dir_layout), bad); |
| else |
| memset(&info->dir_layout, 0, sizeof(info->dir_layout)); |
| |
| 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 features) |
| { |
| int err; |
| |
| if (info->head->is_dentry) { |
| err = parse_reply_info_in(p, end, &info->diri, features); |
| 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, features); |
| 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, |
| int features) |
| { |
| 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], features); |
| 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 fcntl F_GETLK results |
| */ |
| static int parse_reply_info_filelock(void **p, void *end, |
| struct ceph_mds_reply_info_parsed *info, |
| int features) |
| { |
| if (*p + sizeof(*info->filelock_reply) > end) |
| goto bad; |
| |
| info->filelock_reply = *p; |
| *p += sizeof(*info->filelock_reply); |
| |
| if (unlikely(*p != end)) |
| goto bad; |
| return 0; |
| |
| bad: |
| return -EIO; |
| } |
| |
| /* |
| * parse extra results |
| */ |
| static int parse_reply_info_extra(void **p, void *end, |
| struct ceph_mds_reply_info_parsed *info, |
| int features) |
| { |
| if (info->head->op == CEPH_MDS_OP_GETFILELOCK) |
| return parse_reply_info_filelock(p, end, info, features); |
| else |
| return parse_reply_info_dir(p, end, info, features); |
| } |
| |
| /* |
| * parse entire mds reply |
| */ |
| static int parse_reply_info(struct ceph_msg *msg, |
| struct ceph_mds_reply_info_parsed *info, |
| int features) |
| { |
| 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, features); |
| if (err < 0) |
| goto out_bad; |
| } |
| |
| /* extra */ |
| ceph_decode_32_safe(&p, end, len, bad); |
| if (len > 0) { |
| err = parse_reply_info_extra(&p, p+len, info, features); |
| 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_RESTARTING: return "restarting"; |
| 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->fsc->client->monc.auth->ops->destroy_authorizer( |
| s->s_mdsc->fsc->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]; |
| } |
| |
| static int __verify_registered_session(struct ceph_mds_client *mdsc, |
| struct ceph_mds_session *s) |
| { |
| if (s->s_mds >= mdsc->max_sessions || |
| mdsc->sessions[s->s_mds] != s) |
| return -ENOENT; |
| return 0; |
| } |
| |
| /* |
| * 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); |
| if (!s) |
| return ERR_PTR(-ENOMEM); |
| 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->fsc->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; |
| s->s_trim_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; |
| s->s_cap_iterator = NULL; |
| 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); |
| BUG_ON(mdsc->sessions[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) { |
| /* |
| * track (and drop pins for) r_old_dentry_dir |
| * separately, since r_old_dentry's d_parent may have |
| * changed between the dir mutex being dropped and |
| * this request being freed. |
| */ |
| ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), |
| CEPH_CAP_PIN); |
| dput(req->r_old_dentry); |
| iput(req->r_old_dentry_dir); |
| } |
| kfree(req->r_path1); |
| kfree(req->r_path2); |
| put_request_session(req); |
| ceph_unreserve_caps(req->r_mdsc, &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; |
| struct rb_node *n = mdsc->request_tree.rb_node; |
| |
| while (n) { |
| req = rb_entry(n, struct ceph_mds_request, r_node); |
| if (tid < req->r_tid) |
| n = n->rb_left; |
| else if (tid > req->r_tid) |
| n = n->rb_right; |
| else { |
| ceph_mdsc_get_request(req); |
| return req; |
| } |
| } |
| return NULL; |
| } |
| |
| static void __insert_request(struct ceph_mds_client *mdsc, |
| struct ceph_mds_request *new) |
| { |
| struct rb_node **p = &mdsc->request_tree.rb_node; |
| struct rb_node *parent = NULL; |
| struct ceph_mds_request *req = NULL; |
| |
| while (*p) { |
| parent = *p; |
| req = rb_entry(parent, struct ceph_mds_request, r_node); |
| if (new->r_tid < req->r_tid) |
| p = &(*p)->rb_left; |
| else if (new->r_tid > req->r_tid) |
| p = &(*p)->rb_right; |
| else |
| BUG(); |
| } |
| |
| rb_link_node(&new->r_node, parent, p); |
| rb_insert_color(&new->r_node, &mdsc->request_tree); |
| } |
| |
| /* |
| * 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(mdsc, &req->r_caps_reservation, |
| req->r_num_caps); |
| dout("__register_request %p tid %lld\n", req, req->r_tid); |
| ceph_mdsc_get_request(req); |
| __insert_request(mdsc, req); |
| |
| req->r_uid = current_fsuid(); |
| req->r_gid = current_fsgid(); |
| |
| if (dir) { |
| struct ceph_inode_info *ci = ceph_inode(dir); |
| |
| ihold(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); |
| rb_erase(&req->r_node, &mdsc->request_tree); |
| RB_CLEAR_NODE(&req->r_node); |
| |
| 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); |
| |
| iput(req->r_unsafe_dir); |
| req->r_unsafe_dir = NULL; |
| } |
| |
| ceph_mdsc_put_request(req); |
| } |
| |
| /* |
| * 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 struct dentry *get_nonsnap_parent(struct dentry *dentry) |
| { |
| /* |
| * we don't need to worry about protecting the d_parent access |
| * here because we never renaming inside the snapped namespace |
| * except to resplice to another snapdir, and either the old or new |
| * result is a valid result. |
| */ |
| while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP) |
| dentry = dentry->d_parent; |
| return dentry; |
| } |
| |
| 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) { |
| /* ignore race with rename; old or new d_parent is okay */ |
| struct dentry *parent = req->r_dentry->d_parent; |
| struct inode *dir = parent->d_inode; |
| |
| if (dir->i_sb != mdsc->fsc->sb) { |
| /* not this fs! */ |
| inode = req->r_dentry->d_inode; |
| } else if (ceph_snap(dir) != CEPH_NOSNAP) { |
| /* direct snapped/virtual snapdir requests |
| * based on parent dir inode */ |
| struct dentry *dn = get_nonsnap_parent(parent); |
| inode = dn->d_inode; |
| dout("__choose_mds using nonsnap parent %p\n", inode); |
| } else if (req->r_dentry->d_inode) { |
| /* dentry target */ |
| inode = req->r_dentry->d_inode; |
| } else { |
| /* dir + name */ |
| inode = dir; |
| hash = ceph_dentry_hash(dir, req->r_dentry); |
| 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, mds, |
| (int)r, frag.ndist); |
| if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
| CEPH_MDS_STATE_ACTIVE) |
| 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); |
| if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
| CEPH_MDS_STATE_ACTIVE) |
| return mds; |
| } |
| } |
| } |
| |
| spin_lock(&ci->i_ceph_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(&ci->i_ceph_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(&ci->i_ceph_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), GFP_NOFS, |
| false); |
| if (!msg) { |
| pr_err("create_session_msg ENOMEM creating msg\n"); |
| return NULL; |
| } |
| 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; |
| |
| /* 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 (!msg) |
| return -ENOMEM; |
| ceph_con_send(&session->s_con, msg); |
| return 0; |
| } |
| |
| /* |
| * open sessions for any export targets for the given mds |
| * |
| * called under mdsc->mutex |
| */ |
| static void __open_export_target_sessions(struct ceph_mds_client *mdsc, |
| struct ceph_mds_session *session) |
| { |
| struct ceph_mds_info *mi; |
| struct ceph_mds_session *ts; |
| int i, mds = session->s_mds; |
| int target; |
| |
| if (mds >= mdsc->mdsmap->m_max_mds) |
| return; |
| mi = &mdsc->mdsmap->m_info[mds]; |
| dout("open_export_target_sessions for mds%d (%d targets)\n", |
| session->s_mds, mi->num_export_targets); |
| |
| for (i = 0; i < mi->num_export_targets; i++) { |
| target = mi->export_targets[i]; |
| ts = __ceph_lookup_mds_session(mdsc, target); |
| if (!ts) { |
| ts = register_session(mdsc, target); |
| if (IS_ERR(ts)) |
| return; |
| } |
| if (session->s_state == CEPH_MDS_SESSION_NEW || |
| session->s_state == CEPH_MDS_SESSION_CLOSING) |
| __open_session(mdsc, session); |
| else |
| dout(" mds%d target mds%d %p is %s\n", session->s_mds, |
| i, ts, session_state_name(ts->s_state)); |
| ceph_put_mds_session(ts); |
| } |
| } |
| |
| void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
| struct ceph_mds_session *session) |
| { |
| mutex_lock(&mdsc->mutex); |
| __open_export_target_sessions(mdsc, session); |
| mutex_unlock(&mdsc->mutex); |
| } |
| |
| /* |
| * 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, with |
| * special care taken to handle a racing __ceph_remove_cap(). |
| * |
| * 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 list_head *p; |
| struct ceph_cap *cap; |
| struct inode *inode, *last_inode = NULL; |
| struct ceph_cap *old_cap = NULL; |
| int ret; |
| |
| dout("iterate_session_caps %p mds%d\n", session, session->s_mds); |
| spin_lock(&session->s_cap_lock); |
| p = session->s_caps.next; |
| while (p != &session->s_caps) { |
| cap = list_entry(p, struct ceph_cap, session_caps); |
| inode = igrab(&cap->ci->vfs_inode); |
| if (!inode) { |
| p = p->next; |
| continue; |
| } |
| session->s_cap_iterator = cap; |
| spin_unlock(&session->s_cap_lock); |
| |
| if (last_inode) { |
| iput(last_inode); |
| last_inode = NULL; |
| } |
| if (old_cap) { |
| ceph_put_cap(session->s_mdsc, old_cap); |
| old_cap = NULL; |
| } |
| |
| ret = cb(inode, cap, arg); |
| last_inode = inode; |
| |
| spin_lock(&session->s_cap_lock); |
| p = p->next; |
| if (cap->ci == NULL) { |
| dout("iterate_session_caps finishing cap %p removal\n", |
| cap); |
| BUG_ON(cap->session != session); |
| list_del_init(&cap->session_caps); |
| session->s_nr_caps--; |
| cap->session = NULL; |
| old_cap = cap; /* put_cap it w/o locks held */ |
| } |
| if (ret < 0) |
| goto out; |
| } |
| ret = 0; |
| out: |
| session->s_cap_iterator = NULL; |
| spin_unlock(&session->s_cap_lock); |
| |
| if (last_inode) |
| iput(last_inode); |
| if (old_cap) |
| ceph_put_cap(session->s_mdsc, old_cap); |
| |
| return ret; |
| } |
| |
| static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, |
| void *arg) |
| { |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| int drop = 0; |
| |
| dout("removing cap %p, ci is %p, inode is %p\n", |
| cap, ci, &ci->vfs_inode); |
| spin_lock(&ci->i_ceph_lock); |
| __ceph_remove_cap(cap); |
| if (!__ceph_is_any_real_caps(ci)) { |
| struct ceph_mds_client *mdsc = |
| ceph_sb_to_client(inode->i_sb)->mdsc; |
| |
| spin_lock(&mdsc->cap_dirty_lock); |
| if (!list_empty(&ci->i_dirty_item)) { |
| pr_info(" dropping dirty %s state for %p %lld\n", |
| ceph_cap_string(ci->i_dirty_caps), |
| inode, ceph_ino(inode)); |
| ci->i_dirty_caps = 0; |
| list_del_init(&ci->i_dirty_item); |
| drop = 1; |
| } |
| if (!list_empty(&ci->i_flushing_item)) { |
| pr_info(" dropping dirty+flushing %s state for %p %lld\n", |
| ceph_cap_string(ci->i_flushing_caps), |
| inode, ceph_ino(inode)); |
| ci->i_flushing_caps = 0; |
| list_del_init(&ci->i_flushing_item); |
| mdsc->num_cap_flushing--; |
| drop = 1; |
| } |
| if (drop && ci->i_wrbuffer_ref) { |
| pr_info(" dropping dirty data for %p %lld\n", |
| inode, ceph_ino(inode)); |
| ci->i_wrbuffer_ref = 0; |
| ci->i_wrbuffer_ref_head = 0; |
| drop++; |
| } |
| spin_unlock(&mdsc->cap_dirty_lock); |
| } |
| spin_unlock(&ci->i_ceph_lock); |
| while (drop--) |
| iput(inode); |
| 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); |
| BUG_ON(!list_empty(&session->s_cap_flushing)); |
| 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_all(&ci->i_cap_wq); |
| if (arg) { |
| spin_lock(&ci->i_ceph_lock); |
| ci->i_wanted_max_size = 0; |
| ci->i_requested_max_size = 0; |
| spin_unlock(&ci->i_ceph_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); |
| session->s_renew_requested = jiffies; |
| |
| /* 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)); |
| msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, |
| ++session->s_renew_seq); |
| if (!msg) |
| return -ENOMEM; |
| 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; |
| |
| 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 (!msg) |
| return -ENOMEM; |
| ceph_con_send(&session->s_con, msg); |
| return 0; |
| } |
| |
| /* |
| * 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(&ci->i_ceph_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); |
| } else { |
| /* try to drop referring dentries */ |
| spin_unlock(&ci->i_ceph_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(&ci->i_ceph_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); |
| session->s_trim_caps = 0; |
| } |
| 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. |
| */ |
| int ceph_add_cap_releases(struct ceph_mds_client *mdsc, |
| struct ceph_mds_session *session) |
| { |
| struct ceph_msg *msg, *partial = NULL; |
| struct ceph_mds_cap_release *head; |
| int err = -ENOMEM; |
| int extra = mdsc->fsc->mount_options->cap_release_safety; |
| int num; |
| |
| dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds, |
| extra); |
| |
| 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; |
| num = le32_to_cpu(head->num); |
| if (num) { |
| dout(" partial %p with (%d/%d)\n", msg, num, |
| (int)CEPH_CAPS_PER_RELEASE); |
| extra += CEPH_CAPS_PER_RELEASE - num; |
| partial = msg; |
| } |
| } |
| 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, |
| GFP_NOFS, false); |
| 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 (partial) { |
| head = partial->front.iov_base; |
| num = le32_to_cpu(head->num); |
| dout(" queueing partial %p with %d/%d\n", partial, num, |
| (int)CEPH_CAPS_PER_RELEASE); |
| list_move_tail(&partial->list_head, |
| &session->s_cap_releases_done); |
| session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - 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(&ci->i_ceph_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(&ci->i_ceph_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 |
| */ |
| void ceph_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); |
| spin_lock(&session->s_cap_lock); |
| 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); |
| 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_lock(&session->s_cap_lock); |
| } |
| spin_unlock(&session->s_cap_lock); |
| } |
| |
| static void discard_cap_releases(struct ceph_mds_client *mdsc, |
| struct ceph_mds_session *session) |
| { |
| struct ceph_msg *msg; |
| struct ceph_mds_cap_release *head; |
| unsigned num; |
| |
| dout("discard_cap_releases mds%d\n", session->s_mds); |
| spin_lock(&session->s_cap_lock); |
| |
| /* zero out the in-progress message */ |
| msg = list_first_entry(&session->s_cap_releases, |
| struct ceph_msg, list_head); |
| head = msg->front.iov_base; |
| num = le32_to_cpu(head->num); |
| dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num); |
| head->num = cpu_to_le32(0); |
| session->s_num_cap_releases += num; |
| |
| /* requeue completed messages */ |
| 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); |
| |
| head = msg->front.iov_base; |
| num = le32_to_cpu(head->num); |
| dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, |
| num); |
| session->s_num_cap_releases += num; |
| head->num = cpu_to_le32(0); |
| msg->front.iov_len = sizeof(*head); |
| list_add(&msg->list_head, &session->s_cap_releases); |
| } |
| |
| 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); |
| |
| mutex_init(&req->r_fill_mutex); |
| req->r_mdsc = mdsc; |
| 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) request, tid in request tree, 0 if none. |
| * |
| * called under mdsc->mutex. |
| */ |
| static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) |
| { |
| if (RB_EMPTY_ROOT(&mdsc->request_tree)) |
| return NULL; |
| return rb_entry(rb_first(&mdsc->request_tree), |
| struct ceph_mds_request, r_node); |
| } |
| |
| static u64 __get_oldest_tid(struct ceph_mds_client *mdsc) |
| { |
| struct ceph_mds_request *req = __get_oldest_req(mdsc); |
| |
| if (req) |
| return req->r_tid; |
| return 0; |
| } |
| |
| /* |
| * 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; |
| unsigned seq; |
| |
| if (dentry == NULL) |
| return ERR_PTR(-EINVAL); |
| |
| retry: |
| len = 0; |
| seq = read_seqbegin(&rename_lock); |
| rcu_read_lock(); |
| 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) { |
| rcu_read_unlock(); |
| pr_err("build_path corrupt dentry %p\n", dentry); |
| return ERR_PTR(-EINVAL); |
| } |
| } |
| rcu_read_unlock(); |
| 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 */ |
| rcu_read_lock(); |
| for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { |
| struct inode *inode; |
| |
| spin_lock(&temp->d_lock); |
| inode = temp->d_inode; |
| if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
| dout("build_path path+%d: %p SNAPDIR\n", |
| pos, temp); |
| } else if (stop_on_nosnap && inode && |
| ceph_snap(inode) == CEPH_NOSNAP) { |
| spin_unlock(&temp->d_lock); |
| break; |
| } else { |
| pos -= temp->d_name.len; |
| if (pos < 0) { |
| spin_unlock(&temp->d_lock); |
| break; |
| } |
| strncpy(path + pos, temp->d_name.name, |
| temp->d_name.len); |
| } |
| spin_unlock(&temp->d_lock); |
| if (pos) |
| path[--pos] = '/'; |
| temp = temp->d_parent; |
| if (temp == NULL) { |
| rcu_read_unlock(); |
| pr_err("build_path corrupt dentry\n"); |
| kfree(path); |
| return ERR_PTR(-EINVAL); |
| } |
| } |
| rcu_read_unlock(); |
| if (pos != 0 || read_seqretry(&rename_lock, seq)) { |
| pr_err("build_path 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 on %p %d built %llx '%.*s'\n", |
| dentry, 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 || rino) { |
| *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*(1 + 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, GFP_NOFS, false); |
| if (!msg) { |
| msg = ERR_PTR(-ENOMEM); |
| goto out_free2; |
| } |
| |
| msg->hdr.tid = cpu_to_le64(req->r_tid); |
| |
| 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(req->r_uid); |
| head->caller_gid = cpu_to_le32(req->r_gid); |
| head->args = req->r_args; |
| |
| ceph_encode_filepath(&p, end, ino1, path1); |
| ceph_encode_filepath(&p, end, ino2, path2); |
| |
| /* make note of release offset, in case we need to replay */ |
| req->r_request_release_offset = p - msg->front.iov_base; |
| |
| /* 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_all(&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_attempts++; |
| if (req->r_inode) { |
| struct ceph_cap *cap = |
| ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); |
| |
| if (cap) |
| req->r_sent_on_mseq = cap->mseq; |
| else |
| req->r_sent_on_mseq = -1; |
| } |
| 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_got_unsafe) { |
| /* |
| * Replay. Do not regenerate message (and rebuild |
| * paths, etc.); just use the original message. |
| * Rebuilding paths will break for renames because |
| * d_move mangles the src name. |
| */ |
| msg = req->r_request; |
| rhead = msg->front.iov_base; |
| |
| flags = le32_to_cpu(rhead->flags); |
| flags |= CEPH_MDS_FLAG_REPLAY; |
| rhead->flags = cpu_to_le32(flags); |
| |
| if (req->r_target_inode) |
| rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); |
| |
| rhead->num_retry = req->r_attempts - 1; |
| |
| /* remove cap/dentry releases from message */ |
| rhead->num_releases = 0; |
| msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset); |
| msg->front.iov_len = req->r_request_release_offset; |
| return 0; |
| } |
| |
| 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_err = PTR_ERR(msg); |
| complete_request(mdsc, req); |
| return PTR_ERR(msg); |
| } |
| req->r_request = msg; |
| |
| rhead = msg->front.iov_base; |
| 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; |
| rhead->ino = 0; |
| |
| dout(" r_locked_dir = %p\n", req->r_locked_dir); |
| 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_err || req->r_got_result) |
| 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; |
| } |
| |
| put_request_session(req); |
| |
| 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); |
| if (IS_ERR(session)) { |
| err = PTR_ERR(session); |
| goto finish; |
| } |
| } |
| req->r_session = get_session(session); |
| |
| 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_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_err = 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. |
| */ |
| static void kick_requests(struct ceph_mds_client *mdsc, int mds) |
| { |
| struct ceph_mds_request *req; |
| struct rb_node *p; |
| |
| dout("kick_requests mds%d\n", mds); |
| for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) { |
| req = rb_entry(p, struct ceph_mds_request, r_node); |
| if (req->r_got_unsafe) |
| continue; |
| if (req->r_session && |
| req->r_session->s_mds == mds) { |
| dout(" kicking tid %llu\n", req->r_tid); |
| __do_request(mdsc, req); |
| } |
| } |
| } |
| |
| 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_dir), |
| CEPH_CAP_PIN); |
| |
| /* issue */ |
| mutex_lock(&mdsc->mutex); |
| __register_request(mdsc, req, dir); |
| __do_request(mdsc, req); |
| |
| if (req->r_err) { |
| err = req->r_err; |
| __unregister_request(mdsc, req); |
| dout("do_request early error %d\n", err); |
| goto out; |
| } |
| |
| /* wait */ |
| mutex_unlock(&mdsc->mutex); |
| dout("do_request waiting\n"); |
| if (req->r_timeout) { |
| err = (long)wait_for_completion_killable_timeout( |
| &req->r_completion, req->r_timeout); |
| if (err == 0) |
| err = -EIO; |
| } else { |
| err = wait_for_completion_killable(&req->r_completion); |
| } |
| dout("do_request waited, got %d\n", err); |
| mutex_lock(&mdsc->mutex); |
| |
| /* only abort if we didn't race with a real reply */ |
| if (req->r_got_result) { |
| err = le32_to_cpu(req->r_reply_info.head->result); |
| } else if (err < 0) { |
| dout("aborted request %lld with %d\n", req->r_tid, err); |
| |
| /* |
| * ensure we aren't running concurrently with |
| * ceph_fill_trace or ceph_readdir_prepopulate, which |
| * rely on locks (dir mutex) held by our caller. |
| */ |
| mutex_lock(&req->r_fill_mutex); |
| req->r_err = err; |
| req->r_aborted = true; |
| mutex_unlock(&req->r_fill_mutex); |
| |
| if (req->r_locked_dir && |
| (req->r_op & CEPH_MDS_OP_WRITE)) |
| ceph_invalidate_dir_request(req); |
| } else { |
| err = req->r_err; |
| } |
| |
| out: |
| mutex_unlock(&mdsc->mutex); |
| dout("do_request %p done, result %d\n", req, err); |
| return err; |
| } |
| |
| /* |
| * Invalidate dir D_COMPLETE, dentry lease state on an aborted MDS |
| * namespace request. |
| */ |
| void ceph_invalidate_dir_request(struct ceph_mds_request *req) |
| { |
| struct inode *inode = req->r_locked_dir; |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| |
| dout("invalidate_dir_request %p (D_COMPLETE, lease(s))\n", inode); |
| spin_lock(&ci->i_ceph_lock); |
| ceph_dir_clear_complete(inode); |
| ci->i_release_count++; |
| spin_unlock(&ci->i_ceph_lock); |
| |
| if (req->r_dentry) |
| ceph_invalidate_dentry_lease(req->r_dentry); |
| if (req->r_old_dentry) |
| ceph_invalidate_dentry_lease(req->r_old_dentry); |
| } |
| |
| /* |
| * 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 = session->s_mds; |
| |
| 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(msg->hdr.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); |
| |
| /* correct session? */ |
| if (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; |
| } |
| if (req->r_got_safe && !head->safe) { |
| pr_warning("got unsafe after safe on %llu from mds%d\n", |
| tid, mds); |
| mutex_unlock(&mdsc->mutex); |
| goto out; |
| } |
| |
| result = le32_to_cpu(head->result); |
| |
| /* |
| * Handle an ESTALE |
| * if we're not talking to the authority, send to them |
| * if the authority has changed while we weren't looking, |
| * send to new authority |
| * Otherwise we just have to return an ESTALE |
| */ |
| if (result == -ESTALE) { |
| dout("got ESTALE on request %llu", req->r_tid); |
| if (!req->r_inode) { |
| /* do nothing; not an authority problem */ |
| } else if (req->r_direct_mode != USE_AUTH_MDS) { |
| dout("not using auth, setting for that now"); |
| req->r_direct_mode = USE_AUTH_MDS; |
| __do_request(mdsc, req); |
| mutex_unlock(&mdsc->mutex); |
| goto out; |
| } else { |
| struct ceph_inode_info *ci = ceph_inode(req->r_inode); |
| struct ceph_cap *cap = NULL; |
| |
| if (req->r_session) |
| cap = ceph_get_cap_for_mds(ci, |
| req->r_session->s_mds); |
| |
| dout("already using auth"); |
| if ((!cap || cap != ci->i_auth_cap) || |
| (cap->mseq != req->r_sent_on_mseq)) { |
| dout("but cap changed, so resending"); |
| __do_request(mdsc, req); |
| mutex_unlock(&mdsc->mutex); |
| goto out; |
| } |
| } |
| dout("have to return ESTALE on request %llu", req->r_tid); |
| } |
| |
| |
| if (head->safe) { |
| req->r_got_safe = true; |
| __unregister_request(mdsc, req); |
| complete_all(&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_req(mdsc)) |
| complete_all(&mdsc->safe_umount_waiters); |
| mutex_unlock(&mdsc->mutex); |
| goto out; |
| } |
| } else { |
| 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, session->s_con.peer_features); |
| mutex_unlock(&mdsc->mutex); |
| |
| mutex_lock(&session->s_mutex); |
| if (err < 0) { |
| pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); |
| 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 */ |
| mutex_lock(&req->r_fill_mutex); |
| err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session); |
| if (err == 0) { |
| if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK && |
| rinfo->dir_nr) |
| ceph_readdir_prepopulate(req, req->r_session); |
| ceph_unreserve_caps(mdsc, &req->r_caps_reservation); |
| } |
| mutex_unlock(&req->r_fill_mutex); |
| |
| up_read(&mdsc->snap_rwsem); |
| out_err: |
| mutex_lock(&mdsc->mutex); |
| if (!req->r_aborted) { |
| if (err) { |
| req->r_err = err; |
| } else { |
| req->r_reply = msg; |
| ceph_msg_get(msg); |
| req->r_got_result = true; |
| } |
| } else { |
| dout("reply arrived after request %lld was aborted\n", tid); |
| } |
| mutex_unlock(&mdsc->mutex); |
| |
| ceph_add_cap_releases(mdsc, req->r_session); |
| 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_mds_session *session, |
| struct ceph_msg *msg) |
| { |
| struct ceph_mds_request *req; |
| u64 tid = le64_to_cpu(msg->hdr.tid); |
| u32 next_mds; |
| u32 fwd_seq; |
| int err = -EINVAL; |
| void *p = msg->front.iov_base; |
| void *end = p + msg->front.iov_len; |
| |
| ceph_decode_need(&p, end, 2*sizeof(u32), bad); |
| next_mds = ceph_decode_32(&p); |
| fwd_seq = ceph_decode_32(&p); |
| |
| mutex_lock(&mdsc->mutex); |
| req = __lookup_request(mdsc, tid); |
| if (!req) { |
| dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); |
| goto out; /* dup reply? */ |
| } |
| |
| if (req->r_aborted) { |
| dout("forward tid %llu aborted, unregistering\n", tid); |
| __unregister_request(mdsc, req); |
| } else if (fwd_seq <= req->r_num_fwd) { |
| dout("forward tid %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 tid %llu to mds%d (we resend)\n", tid, next_mds); |
| BUG_ON(req->r_err); |
| BUG_ON(req->r_got_result); |
| 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 = session->s_mds; |
| struct ceph_mds_session_head *h = msg->front.iov_base; |
| int wake = 0; |
| |
| /* 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); |
| if (op == CEPH_SESSION_CLOSE) |
| __unregister_session(mdsc, session); |
| /* 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: |
| if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
| pr_info("mds%d reconnect success\n", session->s_mds); |
| 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: |
| if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
| pr_info("mds%d reconnect denied\n", session->s_mds); |
| remove_session_caps(session); |
| wake = 1; /* for good measure */ |
| wake_up_all(&mdsc->session_close_wq); |
| kick_requests(mdsc, mds); |
| 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. |
| */ |
| static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, |
| void *arg) |
| { |
| union { |
| struct ceph_mds_cap_reconnect v2; |
| struct ceph_mds_cap_reconnect_v1 v1; |
| } rec; |
| size_t reclen; |
| struct ceph_inode_info *ci; |
| struct ceph_reconnect_state *recon_state = arg; |
| struct ceph_pagelist *pagelist = recon_state->pagelist; |
| 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)); |
| err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); |
| if (err) |
| return err; |
| |
| dentry = d_find_alias(inode); |
| if (dentry) { |
| path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); |
| if (IS_ERR(path)) { |
| err = PTR_ERR(path); |
| goto out_dput; |
| } |
| } else { |
| path = NULL; |
| pathlen = 0; |
| } |
| err = ceph_pagelist_encode_string(pagelist, path, pathlen); |
| if (err) |
| goto out_free; |
| |
| spin_lock(&ci->i_ceph_lock); |
| cap->seq = 0; /* reset cap seq */ |
| cap->issue_seq = 0; /* and issue_seq */ |
| |
| if (recon_state->flock) { |
| rec.v2.cap_id = cpu_to_le64(cap->cap_id); |
| rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); |
| rec.v2.issued = cpu_to_le32(cap->issued); |
| rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); |
| rec.v2.pathbase = cpu_to_le64(pathbase); |
| rec.v2.flock_len = 0; |
| reclen = sizeof(rec.v2); |
| } else { |
| rec.v1.cap_id = cpu_to_le64(cap->cap_id); |
| rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); |
| rec.v1.issued = cpu_to_le32(cap->issued); |
| rec.v1.size = cpu_to_le64(inode->i_size); |
| ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime); |
| ceph_encode_timespec(&rec.v1.atime, &inode->i_atime); |
| rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); |
| rec.v1.pathbase = cpu_to_le64(pathbase); |
| reclen = sizeof(rec.v1); |
| } |
| spin_unlock(&ci->i_ceph_lock); |
| |
| if (recon_state->flock) { |
| int num_fcntl_locks, num_flock_locks; |
| struct ceph_pagelist_cursor trunc_point; |
| |
| ceph_pagelist_set_cursor(pagelist, &trunc_point); |
| do { |
| lock_flocks(); |
| ceph_count_locks(inode, &num_fcntl_locks, |
| &num_flock_locks); |
| rec.v2.flock_len = (2*sizeof(u32) + |
| (num_fcntl_locks+num_flock_locks) * |
| sizeof(struct ceph_filelock)); |
| unlock_flocks(); |
| |
| /* pre-alloc pagelist */ |
| ceph_pagelist_truncate(pagelist, &trunc_point); |
| err = ceph_pagelist_append(pagelist, &rec, reclen); |
| if (!err) |
| err = ceph_pagelist_reserve(pagelist, |
| rec.v2.flock_len); |
| |
| /* encode locks */ |
| if (!err) { |
| lock_flocks(); |
| err = ceph_encode_locks(inode, |
| pagelist, |
| num_fcntl_locks, |
| num_flock_locks); |
| unlock_flocks(); |
| } |
| } while (err == -ENOSPC); |
| } else { |
| err = ceph_pagelist_append(pagelist, &rec, reclen); |
| } |
| |
| out_free: |
| kfree(path); |
| out_dput: |
| dput(dentry); |
| return err; |
| } |
| |
| |
| /* |
| * 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, |
| struct ceph_mds_session *session) |
| { |
| struct ceph_msg *reply; |
| struct rb_node *p; |
| int mds = session->s_mds; |
| int err = -ENOMEM; |
| struct ceph_pagelist *pagelist; |
| struct ceph_reconnect_state recon_state; |
| |
| pr_info("mds%d reconnect start\n", mds); |
| |
| pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); |
| if (!pagelist) |
| goto fail_nopagelist; |
| ceph_pagelist_init(pagelist); |
| |
| reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false); |
| if (!reply) |
| goto fail_nomsg; |
| |
| 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); |
| |
| down_read(&mdsc->snap_rwsem); |
| |
| dout("session %p state %s\n", session, |
| session_state_name(session->s_state)); |
| |
| /* drop old cap expires; we're about to reestablish that state */ |
| discard_cap_releases(mdsc, session); |
| |
| /* traverse this session's caps */ |
| err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps); |
| if (err) |
| goto fail; |
| |
| recon_state.pagelist = pagelist; |
| recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK; |
| err = iterate_session_caps(session, encode_caps_cb, &recon_state); |
| if (err < 0) |
| goto fail; |
| |
| /* |
| * 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. |
| */ |
| for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { |
| struct ceph_snap_realm *realm = |
| rb_entry(p, struct ceph_snap_realm, node); |
| struct ceph_mds_snaprealm_reconnect sr_rec; |
| |
| dout(" adding snap realm %llx seq %lld parent %llx\n", |
| realm->ino, realm->seq, realm->parent_ino); |
| 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); |
| err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); |
| if (err) |
| goto fail; |
| } |
| |
| reply->pagelist = pagelist; |
| if (recon_state.flock) |
| reply->hdr.version = cpu_to_le16(2); |
| reply->hdr.data_len = cpu_to_le32(pagelist->length); |
| reply->nr_pages = calc_pages_for(0, pagelist->length); |
| ceph_con_send(&session->s_con, reply); |
| |
| mutex_unlock(&session->s_mutex); |
| |
| mutex_lock(&mdsc->mutex); |
| __wake_requests(mdsc, &session->s_waiting); |
| mutex_unlock(&mdsc->mutex); |
| |
| up_read(&mdsc->snap_rwsem); |
| return; |
| |
| fail: |
| ceph_msg_put(reply); |
| up_read(&mdsc->snap_rwsem); |
| mutex_unlock(&session->s_mutex); |
| fail_nomsg: |
| ceph_pagelist_release(pagelist); |
| kfree(pagelist); |
| fail_nopagelist: |
| pr_err("error %d preparing reconnect for mds%d\n", err, mds); |
| return; |
| } |
| |
| |
| /* |
| * 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 -> %s%s (session %s)\n", |
| i, ceph_mds_state_name(oldstate), |
| ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", |
| ceph_mds_state_name(newstate), |
| ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", |
| 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); |
| } 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) { |
| mutex_unlock(&mdsc->mutex); |
| send_mds_reconnect(mdsc, s); |
| mutex_lock(&mdsc->mutex); |
| } |
| |
| /* |
| * kick request on any mds that has gone active. |
| */ |
| if (oldstate < CEPH_MDS_STATE_ACTIVE && |
| newstate >= CEPH_MDS_STATE_ACTIVE) { |
| if (oldstate != CEPH_MDS_STATE_CREATING && |
| oldstate != CEPH_MDS_STATE_STARTING) |
| pr_info("mds%d recovery completed\n", s->s_mds); |
| kick_requests(mdsc, i); |
| ceph_kick_flushing_caps(mdsc, s); |
| wake_up_session_caps(s, 1); |
| } |
| } |
| |
| for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) { |
| s = mdsc->sessions[i]; |
| if (!s) |
| continue; |
| if (!ceph_mdsmap_is_laggy(newmap, i)) |
| continue; |
| if (s->s_state == CEPH_MDS_SESSION_OPEN || |
| s->s_state == CEPH_MDS_SESSION_HUNG || |
| s->s_state == CEPH_MDS_SESSION_CLOSING) { |
| dout(" connecting to export targets of laggy mds%d\n", |
| i); |
| __open_export_target_sessions(mdsc, s); |
| } |
| } |
| } |
| |
| |
| |
| /* |
| * 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_mds_session *session, |
| struct ceph_msg *msg) |
| { |
| struct super_block *sb = mdsc->fsc->sb; |
| struct inode *inode; |
| struct dentry *parent, *dentry; |
| struct ceph_dentry_info *di; |
| int mds = session->s_mds; |
| struct ceph_mds_lease *h = msg->front.iov_base; |
| u32 seq; |
| struct ceph_vino vino; |
| struct qstr dname; |
| int release = 0; |
| |
| 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; |
| seq = le32_to_cpu(h->seq); |
| 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; |
| |
| mutex_lock(&session->s_mutex); |
| session->s_seq++; |
| |
| /* lookup inode */ |
| inode = ceph_find_inode(sb, vino); |
| dout("handle_lease %s, ino %llx %p %.*s\n", |
| ceph_lease_op_name(h->action), vino.ino, inode, |
| dname.len, dname.name); |
| if (inode == NULL) { |
| dout("handle_lease no inode %llx\n", vino.ino); |
| goto release; |
| } |
| |
| /* 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) { |
| if (ceph_seq_cmp(di->lease_seq, seq) > 0) |
| 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 = 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); |
| 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, GFP_NOFS, false); |
| if (!msg) |
| return; |
| lease = msg->front.iov_base; |
| lease->action = action; |
| 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) |
| { |
| struct ceph_dentry_info *di; |
| struct ceph_mds_session *session; |
| u32 seq; |
| |
| BUG_ON(inode == NULL); |
| BUG_ON(dentry == NULL); |
| |
| /* 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\n", |
| inode, dentry); |
| 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 to mds%d\n", |
| inode, dentry, 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); |
| ceph_add_cap_releases(mdsc, s); |
| if (s->s_state == CEPH_MDS_SESSION_OPEN || |
| s->s_state == CEPH_MDS_SESSION_HUNG) |
| ceph_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_fs_client *fsc) |
| |
| { |
| struct ceph_mds_client *mdsc; |
| |
| mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); |
| if (!mdsc) |
| return -ENOMEM; |
| mdsc->fsc = fsc; |
| fsc->mdsc = mdsc; |
| mutex_init(&mdsc->mutex); |
| mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); |
| if (mdsc->mdsmap == NULL) |
| return -ENOMEM; |
| |
| init_completion(&mdsc->safe_umount_waiters); |
| init_waitqueue_head(&mdsc->session_close_wq); |
| INIT_LIST_HEAD(&mdsc->waiting_for_map); |
| mdsc->sessions = NULL; |
| mdsc->max_sessions = 0; |
| mdsc->stopping = 0; |
| init_rwsem(&mdsc->snap_rwsem); |
| mdsc->snap_realms = RB_ROOT; |
| INIT_LIST_HEAD(&mdsc->snap_empty); |
| spin_lock_init(&mdsc->snap_empty_lock); |
| mdsc->last_tid = 0; |
| mdsc->request_tree = RB_ROOT; |
| 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-> |