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ceph: split large reconnect into multiple messages
Signed-off-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng
Ilya Dryomov
parent
84bf39509b
commit
81c5a1487e
@ -2393,6 +2393,12 @@ void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc,
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if ((cap->issued & ci->i_flushing_caps) !=
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ci->i_flushing_caps) {
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ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH;
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/* encode_caps_cb() also will reset these sequence
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* numbers. make sure sequence numbers in cap flush
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* message match later reconnect message */
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cap->seq = 0;
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cap->issue_seq = 0;
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cap->mseq = 0;
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__kick_flushing_caps(mdsc, session, ci,
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oldest_flush_tid);
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} else {
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@ -20,6 +20,8 @@
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#include <linux/ceph/auth.h>
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#include <linux/ceph/debugfs.h>
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#define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
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/*
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* A cluster of MDS (metadata server) daemons is responsible for
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* managing the file system namespace (the directory hierarchy and
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@ -46,9 +48,11 @@
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*/
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struct ceph_reconnect_state {
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int nr_caps;
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struct ceph_mds_session *session;
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int nr_caps, nr_realms;
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struct ceph_pagelist *pagelist;
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unsigned msg_version;
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bool allow_multi;
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};
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static void __wake_requests(struct ceph_mds_client *mdsc,
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@ -2985,6 +2989,82 @@ static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
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mutex_unlock(&mdsc->mutex);
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}
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static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
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{
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struct ceph_msg *reply;
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struct ceph_pagelist *_pagelist;
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struct page *page;
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__le32 *addr;
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int err = -ENOMEM;
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if (!recon_state->allow_multi)
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return -ENOSPC;
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/* can't handle message that contains both caps and realm */
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BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
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/* pre-allocate new pagelist */
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_pagelist = ceph_pagelist_alloc(GFP_NOFS);
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if (!_pagelist)
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return -ENOMEM;
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reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
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if (!reply)
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goto fail_msg;
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/* placeholder for nr_caps */
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err = ceph_pagelist_encode_32(_pagelist, 0);
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if (err < 0)
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goto fail;
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if (recon_state->nr_caps) {
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/* currently encoding caps */
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err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
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if (err)
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goto fail;
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} else {
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/* placeholder for nr_realms (currently encoding relams) */
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err = ceph_pagelist_encode_32(_pagelist, 0);
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if (err < 0)
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goto fail;
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}
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err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
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if (err)
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goto fail;
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page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
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addr = kmap_atomic(page);
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if (recon_state->nr_caps) {
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/* currently encoding caps */
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*addr = cpu_to_le32(recon_state->nr_caps);
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} else {
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/* currently encoding relams */
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*(addr + 1) = cpu_to_le32(recon_state->nr_realms);
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}
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kunmap_atomic(addr);
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reply->hdr.version = cpu_to_le16(5);
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reply->hdr.compat_version = cpu_to_le16(4);
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reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
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ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
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ceph_con_send(&recon_state->session->s_con, reply);
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ceph_pagelist_release(recon_state->pagelist);
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recon_state->pagelist = _pagelist;
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recon_state->nr_caps = 0;
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recon_state->nr_realms = 0;
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recon_state->msg_version = 5;
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return 0;
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fail:
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ceph_msg_put(reply);
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fail_msg:
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ceph_pagelist_release(_pagelist);
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return err;
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}
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/*
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* Encode information about a cap for a reconnect with the MDS.
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*/
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@ -3004,9 +3084,6 @@ static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
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dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
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inode, ceph_vinop(inode), cap, cap->cap_id,
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ceph_cap_string(cap->issued));
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err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
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if (err)
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return err;
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spin_lock(&ci->i_ceph_lock);
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cap->seq = 0; /* reset cap seq */
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@ -3046,7 +3123,7 @@ static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
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if (recon_state->msg_version >= 2) {
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int num_fcntl_locks, num_flock_locks;
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struct ceph_filelock *flocks = NULL;
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size_t struct_len, total_len = 0;
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size_t struct_len, total_len = sizeof(u64);
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u8 struct_v = 0;
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encode_again:
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@ -3081,7 +3158,7 @@ encode_again:
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if (recon_state->msg_version >= 3) {
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/* version, compat_version and struct_len */
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total_len = 2 * sizeof(u8) + sizeof(u32);
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total_len += 2 * sizeof(u8) + sizeof(u32);
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struct_v = 2;
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}
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/*
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@ -3098,12 +3175,19 @@ encode_again:
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struct_len += sizeof(u64); /* snap_follows */
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total_len += struct_len;
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err = ceph_pagelist_reserve(pagelist, total_len);
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if (err) {
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kfree(flocks);
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goto out_err;
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if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
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err = send_reconnect_partial(recon_state);
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if (err)
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goto out_freeflocks;
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pagelist = recon_state->pagelist;
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}
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err = ceph_pagelist_reserve(pagelist, total_len);
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if (err)
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goto out_freeflocks;
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ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
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if (recon_state->msg_version >= 3) {
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ceph_pagelist_encode_8(pagelist, struct_v);
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ceph_pagelist_encode_8(pagelist, 1);
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@ -3115,7 +3199,7 @@ encode_again:
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num_fcntl_locks, num_flock_locks);
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if (struct_v >= 2)
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ceph_pagelist_encode_64(pagelist, snap_follows);
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out_freeflocks:
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kfree(flocks);
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} else {
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u64 pathbase = 0;
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@ -3136,20 +3220,81 @@ encode_again:
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}
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err = ceph_pagelist_reserve(pagelist,
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pathlen + sizeof(u32) + sizeof(rec.v1));
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sizeof(u64) + sizeof(u32) +
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pathlen + sizeof(rec.v1));
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if (err) {
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kfree(path);
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goto out_err;
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goto out_freepath;
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}
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ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
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ceph_pagelist_encode_string(pagelist, path, pathlen);
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ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
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out_freepath:
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kfree(path);
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}
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recon_state->nr_caps++;
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out_err:
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if (err >= 0)
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recon_state->nr_caps++;
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return err;
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}
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static int encode_snap_realms(struct ceph_mds_client *mdsc,
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struct ceph_reconnect_state *recon_state)
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{
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struct rb_node *p;
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struct ceph_pagelist *pagelist = recon_state->pagelist;
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int err = 0;
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if (recon_state->msg_version >= 4) {
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err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
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if (err < 0)
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goto fail;
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}
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/*
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* snaprealms. we provide mds with the ino, seq (version), and
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* parent for all of our realms. If the mds has any newer info,
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* it will tell us.
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*/
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for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
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struct ceph_snap_realm *realm =
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rb_entry(p, struct ceph_snap_realm, node);
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struct ceph_mds_snaprealm_reconnect sr_rec;
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if (recon_state->msg_version >= 4) {
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size_t need = sizeof(u8) * 2 + sizeof(u32) +
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sizeof(sr_rec);
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if (pagelist->length + need > RECONNECT_MAX_SIZE) {
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err = send_reconnect_partial(recon_state);
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if (err)
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goto fail;
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pagelist = recon_state->pagelist;
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}
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err = ceph_pagelist_reserve(pagelist, need);
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if (err)
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goto fail;
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ceph_pagelist_encode_8(pagelist, 1);
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ceph_pagelist_encode_8(pagelist, 1);
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ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
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}
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dout(" adding snap realm %llx seq %lld parent %llx\n",
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realm->ino, realm->seq, realm->parent_ino);
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sr_rec.ino = cpu_to_le64(realm->ino);
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sr_rec.seq = cpu_to_le64(realm->seq);
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sr_rec.parent = cpu_to_le64(realm->parent_ino);
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err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
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if (err)
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goto fail;
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recon_state->nr_realms++;
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}
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fail:
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return err;
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}
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@ -3170,18 +3315,17 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc,
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struct ceph_mds_session *session)
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{
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struct ceph_msg *reply;
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struct rb_node *p;
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int mds = session->s_mds;
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int err = -ENOMEM;
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int s_nr_caps;
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struct ceph_pagelist *pagelist;
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struct ceph_reconnect_state recon_state;
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struct ceph_reconnect_state recon_state = {
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.session = session,
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};
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LIST_HEAD(dispose);
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pr_info("mds%d reconnect start\n", mds);
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pagelist = ceph_pagelist_alloc(GFP_NOFS);
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if (!pagelist)
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recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
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if (!recon_state.pagelist)
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goto fail_nopagelist;
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reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
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@ -3225,63 +3369,90 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc,
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/* replay unsafe requests */
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replay_unsafe_requests(mdsc, session);
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ceph_early_kick_flushing_caps(mdsc, session);
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down_read(&mdsc->snap_rwsem);
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/* traverse this session's caps */
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s_nr_caps = session->s_nr_caps;
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err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
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/* placeholder for nr_caps */
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err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
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if (err)
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goto fail;
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recon_state.nr_caps = 0;
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recon_state.pagelist = pagelist;
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if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
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if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
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recon_state.msg_version = 3;
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else
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recon_state.allow_multi = true;
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} else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
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recon_state.msg_version = 3;
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} else {
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recon_state.msg_version = 2;
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}
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/* trsaverse this session's caps */
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err = iterate_session_caps(session, encode_caps_cb, &recon_state);
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if (err < 0)
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goto fail;
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spin_lock(&session->s_cap_lock);
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session->s_cap_reconnect = 0;
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spin_unlock(&session->s_cap_lock);
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/*
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* snaprealms. we provide mds with the ino, seq (version), and
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* parent for all of our realms. If the mds has any newer info,
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* it will tell us.
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*/
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for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
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struct ceph_snap_realm *realm =
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rb_entry(p, struct ceph_snap_realm, node);
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struct ceph_mds_snaprealm_reconnect sr_rec;
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if (err < 0)
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goto fail;
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dout(" adding snap realm %llx seq %lld parent %llx\n",
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realm->ino, realm->seq, realm->parent_ino);
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sr_rec.ino = cpu_to_le64(realm->ino);
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sr_rec.seq = cpu_to_le64(realm->seq);
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sr_rec.parent = cpu_to_le64(realm->parent_ino);
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err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
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/* check if all realms can be encoded into current message */
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if (mdsc->num_snap_realms) {
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size_t total_len =
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recon_state.pagelist->length +
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mdsc->num_snap_realms *
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sizeof(struct ceph_mds_snaprealm_reconnect);
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if (recon_state.msg_version >= 4) {
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/* number of realms */
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total_len += sizeof(u32);
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/* version, compat_version and struct_len */
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total_len += mdsc->num_snap_realms *
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(2 * sizeof(u8) + sizeof(u32));
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}
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if (total_len > RECONNECT_MAX_SIZE) {
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if (!recon_state.allow_multi) {
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err = -ENOSPC;
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goto fail;
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}
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if (recon_state.nr_caps) {
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err = send_reconnect_partial(&recon_state);
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if (err)
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goto fail;
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}
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recon_state.msg_version = 5;
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}
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}
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reply->hdr.version = cpu_to_le16(recon_state.msg_version);
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err = encode_snap_realms(mdsc, &recon_state);
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if (err < 0)
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goto fail;
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/* raced with cap release? */
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if (s_nr_caps != recon_state.nr_caps) {
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struct page *page = list_first_entry(&pagelist->head,
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if (recon_state.msg_version >= 5) {
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err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
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if (err < 0)
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goto fail;
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}
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if (recon_state.nr_caps || recon_state.nr_realms) {
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struct page *page =
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list_first_entry(&recon_state.pagelist->head,
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struct page, lru);
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__le32 *addr = kmap_atomic(page);
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if (recon_state.nr_caps) {
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WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
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*addr = cpu_to_le32(recon_state.nr_caps);
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} else if (recon_state.msg_version >= 4) {
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*(addr + 1) = cpu_to_le32(recon_state.nr_realms);
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}
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kunmap_atomic(addr);
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}
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reply->hdr.data_len = cpu_to_le32(pagelist->length);
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ceph_msg_data_add_pagelist(reply, pagelist);
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reply->hdr.version = cpu_to_le16(recon_state.msg_version);
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if (recon_state.msg_version >= 4)
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reply->hdr.compat_version = cpu_to_le16(4);
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ceph_early_kick_flushing_caps(mdsc, session);
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reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
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ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
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ceph_con_send(&session->s_con, reply);
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@ -3292,7 +3463,7 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc,
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mutex_unlock(&mdsc->mutex);
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up_read(&mdsc->snap_rwsem);
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ceph_pagelist_release(pagelist);
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ceph_pagelist_release(recon_state.pagelist);
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return;
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fail:
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@ -3300,7 +3471,7 @@ fail:
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up_read(&mdsc->snap_rwsem);
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mutex_unlock(&session->s_mutex);
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fail_nomsg:
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ceph_pagelist_release(pagelist);
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ceph_pagelist_release(recon_state.pagelist);
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fail_nopagelist:
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pr_err("error %d preparing reconnect for mds%d\n", err, mds);
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return;
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@ -3698,6 +3869,7 @@ int ceph_mdsc_init(struct ceph_fs_client *fsc)
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init_rwsem(&mdsc->snap_rwsem);
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mdsc->snap_realms = RB_ROOT;
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INIT_LIST_HEAD(&mdsc->snap_empty);
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mdsc->num_snap_realms = 0;
|
||||
spin_lock_init(&mdsc->snap_empty_lock);
|
||||
mdsc->last_tid = 0;
|
||||
mdsc->oldest_tid = 0;
|
||||
|
||||
@ -21,11 +21,13 @@
|
||||
#define CEPHFS_FEATURE_REPLY_ENCODING 9
|
||||
#define CEPHFS_FEATURE_RECLAIM_CLIENT 10
|
||||
#define CEPHFS_FEATURE_LAZY_CAP_WANTED 11
|
||||
#define CEPHFS_FEATURE_MULTI_RECONNECT 12
|
||||
|
||||
#define CEPHFS_FEATURES_CLIENT_SUPPORTED { \
|
||||
0, 1, 2, 3, 4, 5, 6, 7, \
|
||||
CEPHFS_FEATURE_MIMIC, \
|
||||
CEPHFS_FEATURE_LAZY_CAP_WANTED, \
|
||||
CEPHFS_FEATURE_MULTI_RECONNECT, \
|
||||
}
|
||||
#define CEPHFS_FEATURES_CLIENT_REQUIRED {}
|
||||
|
||||
@ -342,6 +344,7 @@ struct ceph_mds_client {
|
||||
struct rw_semaphore snap_rwsem;
|
||||
struct rb_root snap_realms;
|
||||
struct list_head snap_empty;
|
||||
int num_snap_realms;
|
||||
spinlock_t snap_empty_lock; /* protect snap_empty */
|
||||
|
||||
u64 last_tid; /* most recent mds request */
|
||||
|
||||
@ -124,6 +124,8 @@ static struct ceph_snap_realm *ceph_create_snap_realm(
|
||||
INIT_LIST_HEAD(&realm->inodes_with_caps);
|
||||
spin_lock_init(&realm->inodes_with_caps_lock);
|
||||
__insert_snap_realm(&mdsc->snap_realms, realm);
|
||||
mdsc->num_snap_realms++;
|
||||
|
||||
dout("create_snap_realm %llx %p\n", realm->ino, realm);
|
||||
return realm;
|
||||
}
|
||||
@ -175,6 +177,7 @@ static void __destroy_snap_realm(struct ceph_mds_client *mdsc,
|
||||
dout("__destroy_snap_realm %p %llx\n", realm, realm->ino);
|
||||
|
||||
rb_erase(&realm->node, &mdsc->snap_realms);
|
||||
mdsc->num_snap_realms--;
|
||||
|
||||
if (realm->parent) {
|
||||
list_del_init(&realm->child_item);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user