+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-
-#include "include/int_types.h"
-#include "include/types.h"
-
-#include <unistd.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/ioctl.h>
-
-#include "include/compat.h"
-#include "include/linux_fiemap.h"
-#include "include/color.h"
-#include "include/buffer.h"
-#include "include/assert.h"
-
-#include <iostream>
-#include <fstream>
-#include <sstream>
-
-#include "common/errno.h"
-#include "common/config.h"
-#include "common/sync_filesystem.h"
-
-#include "ZFSFileStoreBackend.h"
-
-#define dout_context cct()
-#define dout_subsys ceph_subsys_filestore
-#undef dout_prefix
-#define dout_prefix *_dout << "zfsfilestorebackend(" << get_basedir_path() << ") "
-
-ZFSFileStoreBackend::ZFSFileStoreBackend(FileStore *fs) :
- GenericFileStoreBackend(fs), base_zh(NULL), current_zh(NULL),
- m_filestore_zfs_snap(cct()->_conf->filestore_zfs_snap)
-{
- int ret = zfs.init();
- if (ret < 0) {
- dout(0) << "ZFSFileStoreBackend: failed to init libzfs" << dendl;
- return;
- }
-
- base_zh = zfs.path_to_zhandle(get_basedir_path().c_str(), ZFS::TYPE_FILESYSTEM);
- if (!base_zh) {
- dout(0) << "ZFSFileStoreBackend: failed to get zfs handler for basedir" << dendl;
- return;
- }
-
- update_current_zh();
-}
-
-ZFSFileStoreBackend::~ZFSFileStoreBackend()
-{
- if (base_zh)
- zfs.close(base_zh);
- if (current_zh)
- zfs.close(current_zh);
-}
-
-int ZFSFileStoreBackend::update_current_zh()
-{
- char path[PATH_MAX];
- snprintf(path, sizeof(path), "%s/current", zfs.get_name(base_zh));
- ZFS::Handle *zh = zfs.open(path, ZFS::TYPE_FILESYSTEM);
- if (zh) {
- char *mnt;
- if (zfs.is_mounted(zh, &mnt)) {
- int ret = get_current_path() == mnt;
- free(mnt);
- if (ret) {
- current_zh = zh;
- return 0;
- }
- } else {
- int ret = zfs.mount(zh, NULL, 0);
- if (ret < 0) {
- ret = -errno;
- dout(0) << "update_current_zh: zfs_mount '" << zfs.get_name(zh)
- << "' got " << cpp_strerror(ret) << dendl;
- return ret;
- }
- }
- zfs.close(zh);
- } else {
- dout(0) << "update_current_zh: zfs_open '" << path << "' got NULL" << dendl;
- return -ENOENT;
- }
-
- zh = zfs.path_to_zhandle(get_current_path().c_str(), ZFS::TYPE_FILESYSTEM);
- if (zh) {
- if (strcmp(zfs.get_name(base_zh), zfs.get_name(zh))) {
- current_zh = zh;
- return 0;
- }
- zfs.close(zh);
- dout(0) << "update_current_zh: basedir and current/ on the same filesystem" << dendl;
- } else {
- dout(0) << "update_current_zh: current/ not exist" << dendl;
- }
- return -ENOENT;
-}
-
-int ZFSFileStoreBackend::detect_features()
-{
- if (!current_zh)
- dout(0) << "detect_features: null zfs handle for current/" << dendl;
- return 0;
-}
-
-bool ZFSFileStoreBackend::can_checkpoint()
-{
- return m_filestore_zfs_snap && current_zh != NULL;
-}
-
-int ZFSFileStoreBackend::create_current()
-{
- struct stat st;
- int ret = ::stat(get_current_path().c_str(), &st);
- if (ret == 0) {
- // current/ exists
- if (!S_ISDIR(st.st_mode)) {
- dout(0) << "create_current: current/ exists but is not a directory" << dendl;
- return -ENOTDIR;
- }
- return 0;
- } else if (errno != ENOENT) {
- ret = -errno;
- dout(0) << "create_current: cannot stat current/ " << cpp_strerror(ret) << dendl;
- return ret;
- }
-
- char path[PATH_MAX];
- snprintf(path, sizeof(path), "%s/current", zfs.get_name(base_zh));
- ret = zfs.create(path, ZFS::TYPE_FILESYSTEM);
- if (ret < 0 && errno != EEXIST) {
- ret = -errno;
- dout(0) << "create_current: zfs_create '" << path << "' got " << cpp_strerror(ret) << dendl;
- return ret;
- }
-
- ret = update_current_zh();
- return ret;
-}
-
-static int list_checkpoints_callback(ZFS::Handle *zh, void *data)
-{
- list<string> *ls = static_cast<list<string> *>(data);
- string str = ZFS::get_name(zh);
- size_t pos = str.find('@');
- assert(pos != string::npos && pos + 1 != str.length());
- ls->push_back(str.substr(pos + 1));
- return 0;
-}
-
-int ZFSFileStoreBackend::list_checkpoints(list<string>& ls)
-{
- dout(10) << "list_checkpoints:" << dendl;
- if (!current_zh)
- return -EINVAL;
-
- list<string> snaps;
- int ret = zfs.iter_snapshots_sorted(current_zh, list_checkpoints_callback, &snaps);
- if (ret < 0) {
- ret = -errno;
- dout(0) << "list_checkpoints: zfs_iter_snapshots_sorted got" << cpp_strerror(ret) << dendl;
- return ret;
- }
- ls.swap(snaps);
- return 0;
-}
-
-int ZFSFileStoreBackend::create_checkpoint(const string& name, uint64_t *cid)
-{
- dout(10) << "create_checkpoint: '" << name << "'" << dendl;
- if (!current_zh)
- return -EINVAL;
-
- // looks like zfsonlinux doesn't flush dirty data when taking snapshot
- int ret = sync_filesystem(get_current_fd());
- if (ret < 0) {
- ret = -errno;
- dout(0) << "create_checkpoint: sync_filesystem got" << cpp_strerror(ret) << dendl;
- return ret;
- }
-
- char path[PATH_MAX];
- snprintf(path, sizeof(path), "%s@%s", zfs.get_name(current_zh), name.c_str());
- ret = zfs.snapshot(path, false);
- if (ret < 0) {
- ret = -errno;
- dout(0) << "create_checkpoint: zfs_snapshot '" << path << "' got" << cpp_strerror(ret) << dendl;
- return ret;
- }
- if (cid)
- *cid = 0;
- return 0;
-}
-
-int ZFSFileStoreBackend::rollback_to(const string& name)
-{
- dout(10) << "rollback_to: '" << name << "'" << dendl;
- if (!current_zh)
- return -EINVAL;
-
- // umount current to avoid triggering online rollback deadlock
- int ret;
- if (zfs.is_mounted(current_zh, NULL)) {
- ret = zfs.umount(current_zh, NULL, 0);
- if (ret < 0) {
- ret = -errno;
- dout(0) << "rollback_to: zfs_umount '" << zfs.get_name(current_zh) << "' got" << cpp_strerror(ret) << dendl;
- }
- }
-
- char path[PATH_MAX];
- snprintf(path, sizeof(path), "%s@%s", zfs.get_name(current_zh), name.c_str());
-
- ZFS::Handle *snap_zh = zfs.open(path, ZFS::TYPE_SNAPSHOT);
- if (!snap_zh) {
- dout(0) << "rollback_to: zfs_open '" << path << "' got NULL" << dendl;
- return -ENOENT;
- }
-
- ret = zfs.rollback(current_zh, snap_zh, false);
- if (ret < 0) {
- ret = -errno;
- dout(0) << "rollback_to: zfs_rollback '" << zfs.get_name(snap_zh) << "' got" << cpp_strerror(ret) << dendl;
- }
-
- if (!zfs.is_mounted(current_zh, NULL)) {
- int ret = zfs.mount(current_zh, NULL, 0);
- if (ret < 0) {
- ret = -errno;
- dout(0) << "update_current_zh: zfs_mount '" << zfs.get_name(current_zh) << "' got " << cpp_strerror(ret) << dendl;
- return ret;
- }
- }
-
- zfs.close(snap_zh);
- return ret;
-}
-
-int ZFSFileStoreBackend::destroy_checkpoint(const string& name)
-{
- dout(10) << "destroy_checkpoint: '" << name << "'" << dendl;
- if (!current_zh)
- return -EINVAL;
-
- int ret = zfs.destroy_snaps(current_zh, name.c_str(), true);
- if (ret < 0) {
- ret = -errno;
- dout(0) << "destroy_checkpoint: zfs_destroy_snaps '" << name << "' got" << cpp_strerror(ret) << dendl;
- }
- return ret;
-}
Code Review / stor4nfv.git / blobdiff