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Diffstat (limited to 'src/messages/MDiscoverReply.h')
| -rw-r--r-- | src/messages/MDiscoverReply.h | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/src/messages/MDiscoverReply.h b/src/messages/MDiscoverReply.h new file mode 100644 index 000000000..e2d11d0fb --- /dev/null +++ b/src/messages/MDiscoverReply.h @@ -0,0 +1,215 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab +/* + * Ceph - scalable distributed file system + * + * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net> + * + * This is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License version 2.1, as published by the Free Software + * Foundation. See file COPYING. + * + */ + + +#ifndef CEPH_MDISCOVERREPLY_H +#define CEPH_MDISCOVERREPLY_H + +#include "include/filepath.h" +#include "messages/MMDSOp.h" + +#include <string> + + + +/** + * MDiscoverReply - return new replicas (of inodes, dirs, dentries) + * + * we group returned items by (dir, dentry, inode). each + * item in each set shares an index (it's "depth"). + * + * we can start and end with any type. + * no_base_dir = true if the first group has an inode but no dir + * no_base_dentry = true if the first group has an inode but no dentry + * they are false if there is no returned data, ie the first group is empty. + * + * we also return errors: + * error_flag_dn(std::string) - the specified dentry dne + * error_flag_dir - the last item wasn't a dir, so we couldn't continue. + * + * and sometimes, + * dir_auth_hint - where we think the dir auth is + * + * depth() gives us the number of depth units/indices for which we have + * information. this INCLUDES those for which we have errors but no data. + * + * see MDCache::handle_discover, handle_discover_reply. + * + * + * so basically, we get + * + * dir den ino i + * x 0 + * x x x 1 + * or + * x x 0 + * x x x 1 + * or + * x x x 0 + * x x x 1 + * ...and trail off however we want. + * + * + */ + +class MDiscoverReply final : public MMDSOp { +private: + static constexpr int HEAD_VERSION = 2; + static constexpr int COMPAT_VERSION = 2; + + // info about original request + inodeno_t base_ino; + frag_t base_dir_frag; + bool wanted_base_dir = false; + bool path_locked = false; + snapid_t wanted_snapid; + + // and the response + bool flag_error_dn = false; + bool flag_error_dir = false; + std::string error_dentry; // dentry that was not found (to trigger waiters on asker) + bool unsolicited = false; + + mds_rank_t dir_auth_hint = 0; + + public: + __u8 starts_with = 0; + ceph::buffer::list trace; + + enum { DIR, DENTRY, INODE }; + + // accessors + inodeno_t get_base_ino() const { return base_ino; } + frag_t get_base_dir_frag() const { return base_dir_frag; } + bool get_wanted_base_dir() const { return wanted_base_dir; } + bool is_path_locked() const { return path_locked; } + snapid_t get_wanted_snapid() const { return wanted_snapid; } + + bool is_flag_error_dn() const { return flag_error_dn; } + bool is_flag_error_dir() const { return flag_error_dir; } + const std::string& get_error_dentry() const { return error_dentry; } + + int get_starts_with() const { return starts_with; } + + mds_rank_t get_dir_auth_hint() const { return dir_auth_hint; } + + bool is_unsolicited() const { return unsolicited; } + void mark_unsolicited() { unsolicited = true; } + + void set_base_dir_frag(frag_t df) { base_dir_frag = df; } + +protected: + MDiscoverReply() : MMDSOp{MSG_MDS_DISCOVERREPLY, HEAD_VERSION, COMPAT_VERSION} { } + MDiscoverReply(const MDiscover &dis) : + MMDSOp{MSG_MDS_DISCOVERREPLY, HEAD_VERSION, COMPAT_VERSION}, + base_ino(dis.get_base_ino()), + base_dir_frag(dis.get_base_dir_frag()), + wanted_base_dir(dis.wants_base_dir()), + path_locked(dis.is_path_locked()), + wanted_snapid(dis.get_snapid()), + flag_error_dn(false), + flag_error_dir(false), + unsolicited(false), + dir_auth_hint(CDIR_AUTH_UNKNOWN), + starts_with(DIR) + { + header.tid = dis.get_tid(); + } + MDiscoverReply(dirfrag_t df) : + MMDSOp{MSG_MDS_DISCOVERREPLY, HEAD_VERSION, COMPAT_VERSION}, + base_ino(df.ino), + base_dir_frag(df.frag), + wanted_base_dir(false), + path_locked(false), + wanted_snapid(CEPH_NOSNAP), + flag_error_dn(false), + flag_error_dir(false), + unsolicited(false), + dir_auth_hint(CDIR_AUTH_UNKNOWN), + starts_with(DIR) + { + header.tid = 0; + } + ~MDiscoverReply() final {} + +public: + std::string_view get_type_name() const override { return "discover_reply"; } + void print(std::ostream& out) const override { + out << "discover_reply(" << header.tid << " " << base_ino << ")"; + } + + // builders + bool is_empty() const { + return trace.length() == 0 && + !flag_error_dn && + !flag_error_dir && + dir_auth_hint == CDIR_AUTH_UNKNOWN; + } + + // void set_flag_forward() { flag_forward = true; } + void set_flag_error_dn(std::string_view dn) { + flag_error_dn = true; + error_dentry = dn; + } + void set_flag_error_dir() { + flag_error_dir = true; + } + void set_dir_auth_hint(int a) { + dir_auth_hint = a; + } + void set_error_dentry(std::string_view dn) { + error_dentry = dn; + } + + + // ... + void decode_payload() override { + using ceph::decode; + auto p = payload.cbegin(); + decode(base_ino, p); + decode(base_dir_frag, p); + decode(wanted_base_dir, p); + decode(path_locked, p); + decode(wanted_snapid, p); + decode(flag_error_dn, p); + decode(flag_error_dir, p); + decode(error_dentry, p); + decode(dir_auth_hint, p); + decode(unsolicited, p); + + decode(starts_with, p); + decode(trace, p); + } + void encode_payload(uint64_t features) override { + using ceph::encode; + encode(base_ino, payload); + encode(base_dir_frag, payload); + encode(wanted_base_dir, payload); + encode(path_locked, payload); + encode(wanted_snapid, payload); + encode(flag_error_dn, payload); + encode(flag_error_dir, payload); + encode(error_dentry, payload); + encode(dir_auth_hint, payload); + encode(unsolicited, payload); + + encode(starts_with, payload); + encode(trace, payload); + } +private: + template<class T, typename... Args> + friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args); +}; + +#endif |