Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 822 insertions, 0 deletions

diff --git a/src/libcephsqlite.cc b/src/libcephsqlite.cc
new file mode 100644
index 000000000..a6e8a4883
--- /dev/null
+++ b/src/libcephsqlite.cc
@@ -0,0 +1,822 @@
+// -*- 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) 2021 Red Hat, Inc.
+ *
+ * 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.
+ *
+ */
+
+#include <boost/smart_ptr/intrusive_ptr.hpp>
+#include <fmt/format.h>
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <iomanip>
+#include <iostream>
+#include <regex>
+#include <sstream>
+#include <string_view>
+
+#include <limits.h>
+#include <string.h>
+
+#include <sqlite3ext.h>
+SQLITE_EXTENSION_INIT1
+
+#include "include/ceph_assert.h"
+#include "include/rados/librados.hpp"
+
+#include "common/Clock.h"
+#include "common/Formatter.h"
+#include "common/ceph_argparse.h"
+#include "common/ceph_mutex.h"
+#include "common/common_init.h"
+#include "common/config.h"
+#include "common/debug.h"
+#include "common/errno.h"
+#include "common/perf_counters.h"
+#include "common/version.h"
+
+#include "include/libcephsqlite.h"
+#include "SimpleRADOSStriper.h"
+
+#define dout_subsys ceph_subsys_cephsqlite
+#undef dout_prefix
+#define dout_prefix *_dout << "cephsqlite: " << __func__ << ": "
+#define d(vfs,lvl) ldout(getcct(vfs), (lvl)) << "(client." << getdata(vfs).cluster.get_instance_id() << ") "
+#define dv(lvl) d(vfs,(lvl))
+#define df(lvl) d(f->vfs,(lvl)) << f->loc << " "
+
+enum {
+  P_FIRST = 0xf0000,
+  P_OP_OPEN,
+  P_OP_DELETE,
+  P_OP_ACCESS,
+  P_OP_FULLPATHNAME,
+  P_OP_CURRENTTIME,
+  P_OPF_CLOSE,
+  P_OPF_READ,
+  P_OPF_WRITE,
+  P_OPF_TRUNCATE,
+  P_OPF_SYNC,
+  P_OPF_FILESIZE,
+  P_OPF_LOCK,
+  P_OPF_UNLOCK,
+  P_OPF_CHECKRESERVEDLOCK,
+  P_OPF_FILECONTROL,
+  P_OPF_SECTORSIZE,
+  P_OPF_DEVICECHARACTERISTICS,
+  P_LAST,
+};
+
+struct cephsqlite_appdata {
+  ~cephsqlite_appdata() {
+    if (logger) {
+      cct->get_perfcounters_collection()->remove(logger.get());
+    }
+    if (striper_logger) {
+      cct->get_perfcounters_collection()->remove(striper_logger.get());
+    }
+  }
+  int setup_perf() {
+    ceph_assert(cct);
+    PerfCountersBuilder plb(cct.get(), "libcephsqlite_vfs", P_FIRST, P_LAST);
+    plb.add_time_avg(P_OP_OPEN, "op_open", "Time average of Open operations");
+    plb.add_time_avg(P_OP_DELETE, "op_delete", "Time average of Delete operations");
+    plb.add_time_avg(P_OP_ACCESS, "op_access", "Time average of Access operations");
+    plb.add_time_avg(P_OP_FULLPATHNAME, "op_fullpathname", "Time average of FullPathname operations");
+    plb.add_time_avg(P_OP_CURRENTTIME, "op_currenttime", "Time average of Currenttime operations");
+    plb.add_time_avg(P_OPF_CLOSE, "opf_close", "Time average of Close file operations");
+    plb.add_time_avg(P_OPF_READ, "opf_read", "Time average of Read file operations");
+    plb.add_time_avg(P_OPF_WRITE, "opf_write", "Time average of Write file operations");
+    plb.add_time_avg(P_OPF_TRUNCATE, "opf_truncate", "Time average of Truncate file operations");
+    plb.add_time_avg(P_OPF_SYNC, "opf_sync", "Time average of Sync file operations");
+    plb.add_time_avg(P_OPF_FILESIZE, "opf_filesize", "Time average of FileSize file operations");
+    plb.add_time_avg(P_OPF_LOCK, "opf_lock", "Time average of Lock file operations");
+    plb.add_time_avg(P_OPF_UNLOCK, "opf_unlock", "Time average of Unlock file operations");
+    plb.add_time_avg(P_OPF_CHECKRESERVEDLOCK, "opf_checkreservedlock", "Time average of CheckReservedLock file operations");
+    plb.add_time_avg(P_OPF_FILECONTROL, "opf_filecontrol", "Time average of FileControl file operations");
+    plb.add_time_avg(P_OPF_SECTORSIZE, "opf_sectorsize", "Time average of SectorSize file operations");
+    plb.add_time_avg(P_OPF_DEVICECHARACTERISTICS, "opf_devicecharacteristics", "Time average of DeviceCharacteristics file operations");
+    logger.reset(plb.create_perf_counters());
+    if (int rc = SimpleRADOSStriper::config_logger(cct.get(), "libcephsqlite_striper", &striper_logger); rc < 0) {
+      return rc;
+    }
+    cct->get_perfcounters_collection()->add(logger.get());
+    cct->get_perfcounters_collection()->add(striper_logger.get());
+    return 0;
+  }
+  int init_cluster() {
+    ceph_assert(cct);
+    ldout(cct, 5) << "initializing RADOS handle as " << cct->_conf->name << dendl;
+    if (int rc = cluster.init_with_context(cct.get()); rc < 0) {
+      lderr(cct) << "cannot initialize RADOS: " << cpp_strerror(rc) << dendl;
+      return rc;
+    }
+    if (int rc = cluster.connect(); rc < 0) {
+      lderr(cct) << "cannot connect: " << cpp_strerror(rc) << dendl;
+      return rc;
+    }
+    auto s = cluster.get_addrs();
+    ldout(cct, 5) << "completed connection to RADOS with address " << s << dendl;
+    return 0;
+  }
+
+  boost::intrusive_ptr<CephContext> cct;
+  std::unique_ptr<PerfCounters> logger;
+  std::shared_ptr<PerfCounters> striper_logger;
+  librados::Rados cluster;
+  struct sqlite3_vfs vfs{};
+};
+
+struct cephsqlite_fileloc {
+  std::string pool;
+  std::string radosns;
+  std::string name;
+};
+
+struct cephsqlite_fileio {
+  librados::IoCtx ioctx;
+  std::unique_ptr<SimpleRADOSStriper> rs;
+};
+
+std::ostream& operator<<(std::ostream &out, const cephsqlite_fileloc& fileloc) {
+  return out
+    << "["
+    << fileloc.pool
+    << ":"
+    << fileloc.radosns
+    << "/"
+    << fileloc.name
+    << "]"
+    ;
+}
+
+struct cephsqlite_file {
+  sqlite3_file base;
+  struct sqlite3_vfs* vfs = nullptr;
+  int flags = 0;
+  // There are 5 lock states: https://sqlite.org/c3ref/c_lock_exclusive.html
+  int lock = 0;
+  struct cephsqlite_fileloc loc{};
+  struct cephsqlite_fileio io{};
+};
+
+
+#define getdata(vfs) (*((cephsqlite_appdata*)((vfs)->pAppData)))
+
+static CephContext* getcct(sqlite3_vfs* vfs)
+{
+  auto&& appd = getdata(vfs);
+  auto& cct = appd.cct;
+  if (cct) {
+    return cct.get();
+  }
+
+  /* bootstrap cct */
+  std::vector<const char*> env_args;
+  env_to_vec(env_args, "CEPH_ARGS");
+  std::string cluster, conf_file_list; // unused
+  CephInitParameters iparams = ceph_argparse_early_args(env_args, CEPH_ENTITY_TYPE_CLIENT, &cluster, &conf_file_list);
+  cct = boost::intrusive_ptr<CephContext>(common_preinit(iparams, CODE_ENVIRONMENT_LIBRARY, 0), false);
+  cct->_conf.parse_config_files(nullptr, &std::cerr, 0);
+  cct->_conf.parse_env(cct->get_module_type()); // environment variables override
+  cct->_conf.apply_changes(nullptr);
+  common_init_finish(cct.get());
+
+  if (int rc = appd.setup_perf(); rc < 0) {
+    ceph_abort("cannot setup perf counters");
+  }
+
+  if (int rc = appd.init_cluster(); rc < 0) {
+    ceph_abort("cannot setup RADOS cluster handle");
+  }
+
+  return cct.get();
+}
+
+static int Lock(sqlite3_file *file, int ilock)
+{
+  auto f = (cephsqlite_file*)file;
+  auto start = ceph::coarse_mono_clock::now();
+  df(5) << std::hex << ilock << dendl;
+
+  auto& lock = f->lock;
+  ceph_assert(!f->io.rs->is_locked() || lock > SQLITE_LOCK_NONE);
+  ceph_assert(lock <= ilock);
+  if (!f->io.rs->is_locked() && ilock > SQLITE_LOCK_NONE) {
+    if (int rc = f->io.rs->lock(0); rc < 0) {
+      df(5) << "failed: " << rc << dendl;
+      return SQLITE_IOERR;
+    }
+  }
+
+  lock = ilock;
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(f->vfs).logger->tinc(P_OPF_LOCK, end-start);
+  return SQLITE_OK;
+}
+
+static int Unlock(sqlite3_file *file, int ilock)
+{
+  auto f = (cephsqlite_file*)file;
+  auto start = ceph::coarse_mono_clock::now();
+  df(5) << std::hex << ilock << dendl;
+
+  auto& lock = f->lock;
+  ceph_assert(lock == SQLITE_LOCK_NONE || (lock > SQLITE_LOCK_NONE && f->io.rs->is_locked()));
+  ceph_assert(lock >= ilock);
+  if (ilock <= SQLITE_LOCK_NONE && SQLITE_LOCK_NONE < lock) {
+    if (int rc = f->io.rs->unlock(); rc < 0) {
+      df(5) << "failed: " << rc << dendl;
+      return SQLITE_IOERR;
+    }
+  }
+
+  lock = ilock;
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(f->vfs).logger->tinc(P_OPF_UNLOCK, end-start);
+  return SQLITE_OK;
+}
+
+static int CheckReservedLock(sqlite3_file *file, int *result)
+{
+  auto f = (cephsqlite_file*)file;
+  auto start = ceph::coarse_mono_clock::now();
+  df(5) << dendl;
+
+  auto& lock = f->lock;
+  if (lock > SQLITE_LOCK_SHARED) {
+    *result = 1;
+  }
+
+  df(10);
+  f->io.rs->print_lockers(*_dout);
+  *_dout << dendl;
+
+  *result = 0;
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(f->vfs).logger->tinc(P_OPF_CHECKRESERVEDLOCK, end-start);
+  return SQLITE_OK;
+}
+
+static int Close(sqlite3_file *file)
+{
+  auto f = (cephsqlite_file*)file;
+  auto start = ceph::coarse_mono_clock::now();
+  df(5) << dendl;
+  f->~cephsqlite_file();
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(f->vfs).logger->tinc(P_OPF_CLOSE, end-start);
+  return SQLITE_OK;
+}
+
+static int Read(sqlite3_file *file, void *buf, int len, sqlite_int64 off)
+{
+  auto f = (cephsqlite_file*)file;
+  auto start = ceph::coarse_mono_clock::now();
+  df(5) << buf << " " << off << "~" << len << dendl;
+
+  if (int rc = f->io.rs->read(buf, len, off); rc < 0) {
+    df(5) << "read failed: " << cpp_strerror(rc) << dendl;
+    return SQLITE_IOERR_READ;
+  } else {
+    df(5) << "= " << rc << dendl;
+    auto end = ceph::coarse_mono_clock::now();
+    getdata(f->vfs).logger->tinc(P_OPF_READ, end-start);
+    if (rc < len) {
+      memset(buf, 0, len-rc);
+      return SQLITE_IOERR_SHORT_READ;
+    } else {
+      return SQLITE_OK;
+    }
+  }
+}
+
+static int Write(sqlite3_file *file, const void *buf, int len, sqlite_int64 off)
+{
+  auto f = (cephsqlite_file*)file;
+  auto start = ceph::coarse_mono_clock::now();
+  df(5) << off << "~" << len << dendl;
+
+  if (int rc = f->io.rs->write(buf, len, off); rc < 0) {
+    df(5) << "write failed: " << cpp_strerror(rc) << dendl;
+    return SQLITE_IOERR_WRITE;
+  } else {
+    df(5) << "= " << rc << dendl;
+    auto end = ceph::coarse_mono_clock::now();
+    getdata(f->vfs).logger->tinc(P_OPF_WRITE, end-start);
+    return SQLITE_OK;
+  }
+
+}
+
+static int Truncate(sqlite3_file *file, sqlite_int64 size)
+{
+  auto f = (cephsqlite_file*)file;
+  auto start = ceph::coarse_mono_clock::now();
+  df(5) << size << dendl;
+
+  if (int rc = f->io.rs->truncate(size); rc < 0) {
+    df(5) << "truncate failed: " << cpp_strerror(rc) << dendl;
+    return SQLITE_IOERR;
+  }
+
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(f->vfs).logger->tinc(P_OPF_TRUNCATE, end-start);
+  return SQLITE_OK;
+}
+
+static int Sync(sqlite3_file *file, int flags)
+{
+  auto f = (cephsqlite_file*)file;
+  auto start = ceph::coarse_mono_clock::now();
+  df(5) << flags << dendl;
+
+  if (int rc = f->io.rs->flush(); rc < 0) {
+    df(5) << "failed: " << cpp_strerror(rc) << dendl;
+    return SQLITE_IOERR;
+  }
+
+  df(5) << " = 0" << dendl;
+
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(f->vfs).logger->tinc(P_OPF_SYNC, end-start);
+  return SQLITE_OK;
+}
+
+
+static int FileSize(sqlite3_file *file, sqlite_int64 *osize)
+{
+  auto f = (cephsqlite_file*)file;
+  auto start = ceph::coarse_mono_clock::now();
+  df(5) << dendl;
+
+  uint64_t size = 0;
+  if (int rc = f->io.rs->stat(&size); rc < 0) {
+    df(5) << "stat failed: " << cpp_strerror(rc) << dendl;
+    return SQLITE_NOTFOUND;
+  }
+
+  *osize = (sqlite_int64)size;
+
+  df(5) << "= " << size << dendl;
+
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(f->vfs).logger->tinc(P_OPF_FILESIZE, end-start);
+  return SQLITE_OK;
+}
+
+
+static bool parsepath(std::string_view path, struct cephsqlite_fileloc* fileloc)
+{
+  static const std::regex re1{"^/*(\\*[[:digit:]]+):([[:alnum:]\\-_.]*)/([[:alnum:]\\-._]+)$"};
+  static const std::regex re2{"^/*([[:alnum:]\\-_.]+):([[:alnum:]\\-_.]*)/([[:alnum:]\\-._]+)$"};
+
+  std::cmatch cm;
+  if (!std::regex_match(path.data(), cm, re1)) {
+    if (!std::regex_match(path.data(), cm, re2)) {
+      return false;
+    }
+  }
+  fileloc->pool = cm[1];
+  fileloc->radosns = cm[2];
+  fileloc->name = cm[3];
+
+  return true;
+}
+
+static int makestriper(sqlite3_vfs* vfs, const cephsqlite_fileloc& loc, cephsqlite_fileio* io)
+{
+  auto&& appd = getdata(vfs);
+  auto& cct = appd.cct;
+  auto& cluster = appd.cluster;
+  bool gotmap = false;
+
+  dv(10) << loc << dendl;
+
+enoent_retry:
+  if (loc.pool[0] == '*') {
+    std::string err;
+    int64_t id = strict_strtoll(loc.pool.c_str()+1, 10, &err);
+    ceph_assert(err.empty());
+    if (int rc = cluster.ioctx_create2(id, io->ioctx); rc < 0) {
+      if (rc == -ENOENT && !gotmap) {
+        cluster.wait_for_latest_osdmap();
+        gotmap = true;
+        goto enoent_retry;
+      }
+      dv(10) << "cannot create ioctx: " << cpp_strerror(rc) << dendl;
+      return rc;
+    }
+  } else {
+    if (int rc = cluster.ioctx_create(loc.pool.c_str(), io->ioctx); rc < 0) {
+      if (rc == -ENOENT && !gotmap) {
+        cluster.wait_for_latest_osdmap();
+        gotmap = true;
+        goto enoent_retry;
+      }
+      dv(10) << "cannot create ioctx: " << cpp_strerror(rc) << dendl;
+      return rc;
+    }
+  }
+
+  if (!loc.radosns.empty())
+    io->ioctx.set_namespace(loc.radosns);
+
+  io->rs = std::make_unique<SimpleRADOSStriper>(io->ioctx, loc.name);
+  io->rs->set_logger(appd.striper_logger);
+  io->rs->set_lock_timeout(cct->_conf.get_val<std::chrono::milliseconds>("cephsqlite_lock_renewal_timeout"));
+  io->rs->set_lock_interval(cct->_conf.get_val<std::chrono::milliseconds>("cephsqlite_lock_renewal_interval"));
+  io->rs->set_blocklist_the_dead(cct->_conf.get_val<bool>("cephsqlite_blocklist_dead_locker"));
+
+  return 0;
+}
+
+static int SectorSize(sqlite3_file* sf)
+{
+  static const int size = 65536;
+  auto start = ceph::coarse_mono_clock::now();
+  auto f = (cephsqlite_file*)sf;
+  df(5) << " = " << size << dendl;
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(f->vfs).logger->tinc(P_OPF_SECTORSIZE, end-start);
+  return size;
+}
+
+static int FileControl(sqlite3_file* sf, int op, void *arg)
+{
+  auto f = (cephsqlite_file*)sf;
+  auto start = ceph::coarse_mono_clock::now();
+  df(5) << op << ", " << arg << dendl;
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(f->vfs).logger->tinc(P_OPF_FILECONTROL, end-start);
+  return SQLITE_NOTFOUND;
+}
+
+static int DeviceCharacteristics(sqlite3_file* sf)
+{
+  auto f = (cephsqlite_file*)sf;
+  auto start = ceph::coarse_mono_clock::now();
+  df(5) << dendl;
+  static const int c = 0
+      |SQLITE_IOCAP_ATOMIC
+      |SQLITE_IOCAP_POWERSAFE_OVERWRITE
+      |SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN
+      |SQLITE_IOCAP_SAFE_APPEND
+      ;
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(f->vfs).logger->tinc(P_OPF_DEVICECHARACTERISTICS, end-start);
+  return c;
+}
+
+static int Open(sqlite3_vfs *vfs, const char *name, sqlite3_file *file,
+                int flags,  int *oflags)
+{
+  static const sqlite3_io_methods io = {
+    1,                        /* iVersion */
+    Close,                    /* xClose */
+    Read,                     /* xRead */
+    Write,                    /* xWrite */
+    Truncate,                 /* xTruncate */
+    Sync,                     /* xSync */
+    FileSize,                 /* xFileSize */
+    Lock,                     /* xLock */
+    Unlock,                   /* xUnlock */
+    CheckReservedLock,        /* xCheckReservedLock */
+    FileControl,              /* xFileControl */
+    SectorSize,               /* xSectorSize */
+    DeviceCharacteristics     /* xDeviceCharacteristics */
+  };
+
+  auto start = ceph::coarse_mono_clock::now();
+  bool gotmap = false;
+  auto& cluster = getdata(vfs).cluster;
+
+  /* we are not going to create temporary files */
+  if (name == NULL) {
+    dv(-1) << " cannot open temporary database" << dendl;
+    return SQLITE_CANTOPEN;
+  }
+  auto path = std::string_view(name);
+  if (path == ":memory:"sv) {
+    dv(-1) << " cannot open temporary database" << dendl;
+    return SQLITE_IOERR;
+  }
+
+  dv(5) << path << " flags=" << std::hex << flags << dendl;
+
+  auto f = new (file)cephsqlite_file();
+  f->vfs = vfs;
+  if (!parsepath(path, &f->loc)) {
+    ceph_assert(0); /* xFullPathname validates! */
+  }
+  f->flags = flags;
+
+enoent_retry:
+  if (int rc = makestriper(vfs, f->loc, &f->io); rc < 0) {
+    f->~cephsqlite_file();
+    dv(5) << "cannot open striper" << dendl;
+    return SQLITE_IOERR;
+  }
+
+  if (flags & SQLITE_OPEN_CREATE) {
+    dv(10) << "OPEN_CREATE" << dendl;
+    if (int rc = f->io.rs->create(); rc < 0 && rc != -EEXIST) {
+      if (rc == -ENOENT && !gotmap) {
+        /* we may have an out of date OSDMap which cancels the op in the
+         * Objecter. Try to get a new one and retry. This is mostly noticable
+         * in testing when pools are getting created/deleted left and right.
+         */
+        dv(5) << "retrying create after getting latest OSDMap" << dendl;
+        cluster.wait_for_latest_osdmap();
+        gotmap = true;
+        goto enoent_retry;
+      }
+      dv(5) << "file cannot be created: " << cpp_strerror(rc) << dendl;
+      return SQLITE_IOERR;
+    }
+  }
+
+  if (int rc = f->io.rs->open(); rc < 0) {
+    if (rc == -ENOENT && !gotmap) {
+      /* See comment above for create case. */
+      dv(5) << "retrying open after getting latest OSDMap" << dendl;
+      cluster.wait_for_latest_osdmap();
+      gotmap = true;
+      goto enoent_retry;
+    }
+    dv(10) << "cannot open striper: " << cpp_strerror(rc) << dendl;
+    return rc;
+  }
+
+  if (oflags) {
+    *oflags = flags;
+  }
+  f->base.pMethods = &io;
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(vfs).logger->tinc(P_OP_OPEN, end-start);
+  return SQLITE_OK;
+}
+
+/*
+** Delete the file identified by argument path. If the dsync parameter
+** is non-zero, then ensure the file-system modification to delete the
+** file has been synced to disk before returning.
+*/
+static int Delete(sqlite3_vfs* vfs, const char* path, int dsync)
+{
+  auto start = ceph::coarse_mono_clock::now();
+  dv(5) << "'" << path << "', " << dsync << dendl;
+
+  cephsqlite_fileloc fileloc;
+  if (!parsepath(path, &fileloc)) {
+    dv(5) << "path does not parse!" << dendl;
+    return SQLITE_NOTFOUND;
+  }
+
+  cephsqlite_fileio io;
+  if (int rc = makestriper(vfs, fileloc, &io); rc < 0) {
+    dv(5) << "cannot open striper" << dendl;
+    return SQLITE_IOERR;
+  }
+
+  if (int rc = io.rs->lock(0); rc < 0) {
+    return SQLITE_IOERR;
+  }
+
+  if (int rc = io.rs->remove(); rc < 0) {
+    dv(5) << "= " << rc << dendl;
+    return SQLITE_IOERR_DELETE;
+  }
+
+  /* No need to unlock */
+  dv(5) << "= 0" << dendl;
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(vfs).logger->tinc(P_OP_DELETE, end-start);
+
+  return SQLITE_OK;
+}
+
+/*
+** Query the file-system to see if the named file exists, is readable or
+** is both readable and writable.
+*/
+static int Access(sqlite3_vfs* vfs, const char* path, int flags, int* result)
+{
+  auto start = ceph::coarse_mono_clock::now();
+  dv(5) << path << " " << std::hex << flags << dendl;
+
+  cephsqlite_fileloc fileloc;
+  if (!parsepath(path, &fileloc)) {
+    dv(5) << "path does not parse!" << dendl;
+    return SQLITE_NOTFOUND;
+  }
+
+  cephsqlite_fileio io;
+  if (int rc = makestriper(vfs, fileloc, &io); rc < 0) {
+    dv(5) << "cannot open striper" << dendl;
+    return SQLITE_IOERR;
+  }
+
+  if (int rc = io.rs->open(); rc < 0) {
+    if (rc == -ENOENT) {
+      *result = 0;
+      return SQLITE_OK;
+    } else {
+      dv(10) << "cannot open striper: " << cpp_strerror(rc) << dendl;
+      *result = 0;
+      return SQLITE_IOERR;
+    }
+  }
+
+  uint64_t size = 0;
+  if (int rc = io.rs->stat(&size); rc < 0) {
+    dv(5) << "= " << rc << " (" << cpp_strerror(rc) << ")" << dendl;
+    *result = 0;
+  } else {
+    dv(5) << "= 0" << dendl;
+    *result = 1;
+  }
+
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(vfs).logger->tinc(P_OP_ACCESS, end-start);
+  return SQLITE_OK;
+}
+
+/* This method is only called once for each database. It provides a chance to
+ * reformat the path into a canonical format.
+ */
+static int FullPathname(sqlite3_vfs* vfs, const char* ipath, int opathlen, char* opath)
+{
+  auto start = ceph::coarse_mono_clock::now();
+  auto path = std::string_view(ipath);
+
+  dv(5) << "1: " <<  path << dendl;
+
+  cephsqlite_fileloc fileloc;
+  if (!parsepath(path, &fileloc)) {
+    dv(5) << "path does not parse!" << dendl;
+    return SQLITE_NOTFOUND;
+  }
+  dv(5) << " parsed " << fileloc << dendl;
+
+  auto p = fmt::format("{}:{}/{}", fileloc.pool, fileloc.radosns, fileloc.name);
+  if (p.size() >= (size_t)opathlen) {
+    dv(5) << "path too long!" << dendl;
+    return SQLITE_CANTOPEN;
+  }
+  strcpy(opath, p.c_str());
+  dv(5) << " output " << p << dendl;
+
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(vfs).logger->tinc(P_OP_FULLPATHNAME, end-start);
+  return SQLITE_OK;
+}
+
+static int CurrentTime(sqlite3_vfs* vfs, sqlite3_int64* time)
+{
+  auto start = ceph::coarse_mono_clock::now();
+  dv(5) << time << dendl;
+
+  auto t = ceph_clock_now();
+  *time = t.to_msec() + 2440587.5*86400000; /* julian days since 1970 converted to ms */
+
+  auto end = ceph::coarse_mono_clock::now();
+  getdata(vfs).logger->tinc(P_OP_CURRENTTIME, end-start);
+  return SQLITE_OK;
+}
+
+LIBCEPHSQLITE_API int cephsqlite_setcct(CephContext* cct, char** ident)
+{
+  ldout(cct, 1) << "cct: " << cct << dendl;
+
+  if (sqlite3_api == nullptr) {
+    lderr(cct) << "API violation: must have sqlite3 init libcephsqlite" << dendl;
+    return -EINVAL;
+  }
+
+  auto vfs = sqlite3_vfs_find("ceph");
+  if (!vfs) {
+    lderr(cct) << "API violation: must have sqlite3 init libcephsqlite" << dendl;
+    return -EINVAL;
+  }
+
+  auto& appd = getdata(vfs);
+  appd.cct = cct;
+  if (int rc = appd.setup_perf(); rc < 0) {
+    appd.cct = nullptr;
+    return rc;
+  }
+  if (int rc = appd.init_cluster(); rc < 0) {
+    appd.cct = nullptr;
+    return rc;
+  }
+
+  auto s = appd.cluster.get_addrs();
+  if (ident) {
+    *ident = strdup(s.c_str());
+  }
+
+  ldout(cct, 1) << "complete" << dendl;
+
+  return 0;
+}
+
+static void f_perf(sqlite3_context* ctx, int argc, sqlite3_value** argv)
+{
+  auto vfs = (sqlite3_vfs*)sqlite3_user_data(ctx);
+  dv(10) << dendl;
+  auto&& appd = getdata(vfs);
+  JSONFormatter f(false);
+  f.open_object_section("ceph_perf");
+  appd.logger->dump_formatted(&f, false);
+  appd.striper_logger->dump_formatted(&f, false);
+  f.close_section();
+  {
+    CachedStackStringStream css;
+    f.flush(*css);
+    auto sv = css->strv();
+    dv(20) << " = " << sv << dendl;
+    sqlite3_result_text(ctx, sv.data(), sv.size(), SQLITE_TRANSIENT);
+  }
+}
+
+static void f_status(sqlite3_context* ctx, int argc, sqlite3_value** argv)
+{
+  auto vfs = (sqlite3_vfs*)sqlite3_user_data(ctx);
+  dv(10) << dendl;
+  auto&& appd = getdata(vfs);
+  JSONFormatter f(false);
+  f.open_object_section("ceph_status");
+  f.dump_int("id", appd.cluster.get_instance_id());
+  f.dump_string("addr", appd.cluster.get_addrs());
+  f.close_section();
+  {
+    CachedStackStringStream css;
+    f.flush(*css);
+    auto sv = css->strv();
+    dv(20) << " = " << sv << dendl;
+    sqlite3_result_text(ctx, sv.data(), sv.size(), SQLITE_TRANSIENT);
+  }
+}
+
+static int autoreg(sqlite3* db, char** err, const struct sqlite3_api_routines* thunk)
+{
+  auto vfs = sqlite3_vfs_find("ceph");
+  if (!vfs) {
+    ceph_abort("ceph vfs not found");
+  }
+
+  if (int rc = sqlite3_create_function(db, "ceph_perf", 0, SQLITE_UTF8, vfs, f_perf, nullptr, nullptr); rc) {
+    return rc;
+  }
+
+  if (int rc = sqlite3_create_function(db, "ceph_status", 0, SQLITE_UTF8, vfs, f_status, nullptr, nullptr); rc) {
+    return rc;
+  }
+
+  return SQLITE_OK;
+}
+
+LIBCEPHSQLITE_API int sqlite3_cephsqlite_init(sqlite3* db, char** err, const sqlite3_api_routines* api)
+{
+  SQLITE_EXTENSION_INIT2(api);
+
+  auto vfs = sqlite3_vfs_find("ceph");
+  if (!vfs) {
+    auto appd = new cephsqlite_appdata;
+    vfs = &appd->vfs;
+    vfs->iVersion = 2;
+    vfs->szOsFile = sizeof(struct cephsqlite_file);
+    vfs->mxPathname = 4096;
+    vfs->zName = "ceph";
+    vfs->pAppData = appd;
+    vfs->xOpen = Open;
+    vfs->xDelete = Delete;
+    vfs->xAccess = Access;
+    vfs->xFullPathname = FullPathname;
+    vfs->xCurrentTimeInt64 = CurrentTime;
+    appd->cct = nullptr;
+    sqlite3_vfs_register(vfs, 0);
+  }
+
+  if (int rc = sqlite3_auto_extension((void(*)(void))autoreg); rc) {
+    return rc;
+  }
+  if (int rc = autoreg(db, err, api); rc) {
+    return rc;
+  }
+
+  return SQLITE_OK_LOAD_PERMANENTLY;
+}