diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ceph/mds_client.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ceph/mds_client.c | 3465 |
1 files changed, 0 insertions, 3465 deletions
diff --git a/ANDROID_3.4.5/fs/ceph/mds_client.c b/ANDROID_3.4.5/fs/ceph/mds_client.c deleted file mode 100644 index 89971e13..00000000 --- a/ANDROID_3.4.5/fs/ceph/mds_client.c +++ /dev/null @@ -1,3465 +0,0 @@ -#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 If - * the session times out and goes stale, our leases and capabilities - * are no longer valid.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) { - ceph_decode_need(&p, end, len, bad); - 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) { - ceph_decode_need(&p, end, len, bad); - 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_gen_ttl_lock); - s->s_cap_gen = 0; - s->s_cap_ttl = jiffies - 1; - - spin_lock_init(&s->s_cap_lock); - 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 && 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_gen_ttl_lock); - session->s_cap_gen++; - session->s_cap_ttl = jiffies - 1; - spin_unlock(&session->s_gen_ttl_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->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->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->snap_flush_lock); - mdsc->cap_flush_seq = 0; - INIT_LIST_HEAD(&mdsc->cap_dirty); - INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); - 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); - - ceph_caps_init(mdsc); - ceph_adjust_min_caps(mdsc, fsc->min_caps); - - 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_fs_client *fsc = mdsc->fsc; - - mutex_lock(&mdsc->mutex); - if (__get_oldest_req(mdsc)) { - mutex_unlock(&mdsc->mutex); - - dout("wait_requests waiting for requests\n"); - wait_for_completion_timeout(&mdsc->safe_umount_waiters, - fsc->client->options->mount_timeout * HZ); - - /* tear down remaining requests */ - mutex_lock(&mdsc->mutex); - while ((req = __get_oldest_req(mdsc))) { - dout("wait_requests timed out on tid %llu\n", - req->r_tid); - __unregister_request(mdsc, 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 reply handlers to drop their request refs and - * their inode/dcache refs - */ - ceph_msgr_flush(); -} - -/* - * 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 = NULL, *nextreq; - struct rb_node *n; - - mutex_lock(&mdsc->mutex); - dout("wait_unsafe_requests want %lld\n", want_tid); -restart: - req = __get_oldest_req(mdsc); - while (req && req->r_tid <= want_tid) { - /* find next request */ - n = rb_next(&req->r_node); - if (n) - nextreq = rb_entry(n, struct ceph_mds_request, r_node); - else - nextreq = NULL; - if ((req->r_op & CEPH_MDS_OP_WRITE)) { - /* write op */ - ceph_mdsc_get_request(req); - if (nextreq) - ceph_mdsc_get_request(nextreq); - 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); - if (!nextreq) - break; /* next dne before, so we're done! */ - if (RB_EMPTY_NODE(&nextreq->r_node)) { - /* next request was removed from tree */ - ceph_mdsc_put_request(nextreq); - goto restart; - } - ceph_mdsc_put_request(nextreq); /* won't go away */ - } - req = nextreq; - } - mutex_unlock(&mdsc->mutex); - dout("wait_unsafe_requests done\n"); -} - -void ceph_mdsc_sync(struct ceph_mds_client *mdsc) -{ - u64 want_tid, want_flush; - - if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) - return; - - 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)); -} - -/* - * true if all sessions are closed, or we force unmount - */ -static bool done_closing_sessions(struct ceph_mds_client *mdsc) -{ - int i, n = 0; - - if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) - return true; - - mutex_lock(&mdsc->mutex); - for (i = 0; i < mdsc->max_sessions; i++) - if (mdsc->sessions[i]) - n++; - mutex_unlock(&mdsc->mutex); - return n == 0; -} - -/* - * called after sb is ro. - */ -void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) -{ - struct ceph_mds_session *session; - int i; - struct ceph_fs_client *fsc = mdsc->fsc; - unsigned long timeout = fsc->client->options->mount_timeout * HZ; - - dout("close_sessions\n"); - - /* close sessions */ - mutex_lock(&mdsc->mutex); - 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); - } - mutex_unlock(&mdsc->mutex); - - dout("waiting for sessions to close\n"); - wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc), - timeout); - - /* tear down remaining sessions */ - mutex_lock(&mdsc->mutex); - 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"); -} - -static 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); - ceph_caps_finalize(mdsc); -} - -void ceph_mdsc_destroy(struct ceph_fs_client *fsc) -{ - struct ceph_mds_client *mdsc = fsc->mdsc; - - dout("mdsc_destroy %p\n", mdsc); - ceph_mdsc_stop(mdsc); - - /* flush out any connection work with references to us */ - ceph_msgr_flush(); - - fsc->mdsc = NULL; - kfree(mdsc); - dout("mdsc_destroy %p done\n", mdsc); -} - - -/* - * 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->fsc->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->fsc->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->fsc->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 ok (%d)\n", s, 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)\n", s, 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; - struct ceph_mds_client *mdsc = s->s_mdsc; - - pr_warning("mds%d closed our session\n", s->s_mds); - send_mds_reconnect(mdsc, s); -} - -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); - - mutex_lock(&mdsc->mutex); - if (__verify_registered_session(mdsc, s) < 0) { - mutex_unlock(&mdsc->mutex); - goto out; - } - mutex_unlock(&mdsc->mutex); - - 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, s, msg); - break; - case CEPH_MSG_CLIENT_CAPS: - ceph_handle_caps(s, msg); - break; - case CEPH_MSG_CLIENT_SNAP: - ceph_handle_snap(mdsc, s, msg); - break; - case CEPH_MSG_CLIENT_LEASE: - handle_lease(mdsc, s, msg); - break; - - default: - pr_err("received unknown message type %d %s\n", type, - ceph_msg_type_name(type)); - } -out: - 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->fsc->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->fsc->client->monc.auth; - - return ac->ops->verify_authorizer_reply(ac, s->s_authorizer, len); -} - -static int invalidate_authorizer(struct ceph_connection *con) -{ - struct ceph_mds_session *s = con->private; - struct ceph_mds_client *mdsc = s->s_mdsc; - struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; - - if (ac->ops->invalidate_authorizer) - ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); - - return ceph_monc_validate_auth(&mdsc->fsc->client->monc); -} - -static const 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, - .invalidate_authorizer = invalidate_authorizer, - .peer_reset = peer_reset, -}; - -/* eof */ |