ceph/src/cls/cephfs/cls_cephfs_client.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2015 Red Hat
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15
  16
  17 #include "include/rados/librados.hpp"
  18 #include "mds/CInode.h"
  19
  20 #include "cls_cephfs_client.h"
  21
  22 #define XATTR_CEILING "scan_ceiling"
  23 #define XATTR_MAX_MTIME "scan_max_mtime"
  24 #define XATTR_MAX_SIZE "scan_max_size"
  25
  26 int ClsCephFSClient::accumulate_inode_metadata(
  27   librados::IoCtx &ctx,
  28   inodeno_t inode_no,
  29   const uint64_t obj_index,
  30   const uint64_t obj_size,
  31   const time_t mtime)
  32 {
  33   AccumulateArgs args(
  34       obj_index,
  35       obj_size,
  36       mtime,
  37       XATTR_CEILING,
  38       XATTR_MAX_MTIME,
  39       XATTR_MAX_SIZE);
  40
  41   // Generate 0th object name, where we will accumulate sizes/mtimes
  42   object_t zeroth_object = InodeStore::get_object_name(inode_no, frag_t(), "");
  43
  44   // Construct a librados operation invoking our class method
  45   librados::ObjectReadOperation op;
  46   bufferlist inbl;
  47   args.encode(inbl);
  48   op.exec("cephfs", "accumulate_inode_metadata", inbl);
  49
  50   // Execute op
  51   bufferlist outbl;
  52   return ctx.operate(zeroth_object.name, &op, &outbl);
  53 }
  54
  55 int ClsCephFSClient::delete_inode_accumulate_result(
  56     librados::IoCtx &ctx,
  57     const std::string &oid)
  58 {
  59   librados::ObjectWriteOperation op;
  60
  61   // Remove xattrs from object
  62   //
  63   op.rmxattr(XATTR_CEILING);
  64   op.rmxattr(XATTR_MAX_SIZE);
  65   op.rmxattr(XATTR_MAX_MTIME);
  66
  67   return (ctx.operate(oid, &op));
  68 }
  69
  70 int ClsCephFSClient::fetch_inode_accumulate_result(
  71   librados::IoCtx &ctx,
  72   const std::string &oid,
  73   inode_backtrace_t *backtrace,
  74   file_layout_t *layout,
  75   AccumulateResult *result)
  76 {
  77   ceph_assert(backtrace != NULL);
  78   ceph_assert(result != NULL);
  79
  80   librados::ObjectReadOperation op;
  81
  82   int scan_ceiling_r = 0;
  83   bufferlist scan_ceiling_bl;
  84   op.getxattr(XATTR_CEILING, &scan_ceiling_bl, &scan_ceiling_r);
  85
  86   int scan_max_size_r = 0;
  87   bufferlist scan_max_size_bl;
  88   op.getxattr(XATTR_MAX_SIZE, &scan_max_size_bl, &scan_max_size_r);
  89
  90   int scan_max_mtime_r = 0;
  91   bufferlist scan_max_mtime_bl;
  92   op.getxattr(XATTR_MAX_MTIME, &scan_max_mtime_bl, &scan_max_mtime_r);
  93
  94   int parent_r = 0;
  95   bufferlist parent_bl;
  96   op.getxattr("parent", &parent_bl, &parent_r);
  97   op.set_op_flags2(librados::OP_FAILOK);
  98
  99   int layout_r = 0;
 100   bufferlist layout_bl;
 101   op.getxattr("layout", &layout_bl, &layout_r);
 102   op.set_op_flags2(librados::OP_FAILOK);
 103
 104   bufferlist op_bl;
 105   int r = ctx.operate(oid, &op, &op_bl);
 106   if (r < 0) {
 107     return r;
 108   }
 109
 110   // Load scan_ceiling
 111   try {
 112     auto scan_ceiling_bl_iter = scan_ceiling_bl.cbegin();
 113     ObjCeiling ceiling;
 114     ceiling.decode(scan_ceiling_bl_iter);
 115     result->ceiling_obj_index = ceiling.id;
 116     result->ceiling_obj_size = ceiling.size;
 117   } catch (const buffer::error &err) {
 118     //dout(4) << "Invalid size attr on '" << oid << "'" << dendl;
 119     return -EINVAL;
 120   }
 121
 122   // Load scan_max_size
 123   try {
 124     auto scan_max_size_bl_iter = scan_max_size_bl.cbegin();
 125     decode(result->max_obj_size, scan_max_size_bl_iter);
 126   } catch (const buffer::error &err) {
 127     //dout(4) << "Invalid size attr on '" << oid << "'" << dendl;
 128     return -EINVAL;
 129   }
 130
 131   // Load scan_max_mtime
 132   try {
 133     auto scan_max_mtime_bl_iter = scan_max_mtime_bl.cbegin();
 134     decode(result->max_mtime, scan_max_mtime_bl_iter);
 135   } catch (const buffer::error &err) {
 136     //dout(4) << "Invalid size attr on '" << oid << "'" << dendl;
 137     return -EINVAL;
 138   }
 139
 140   // Deserialize backtrace
 141   if (parent_bl.length()) {
 142     try {
 143       auto q = parent_bl.cbegin();
 144       backtrace->decode(q);
 145     } catch (buffer::error &e) {
 146       //dout(4) << "Corrupt backtrace on '" << oid << "': " << e << dendl;
 147       return -EINVAL;
 148     }
 149   }
 150
 151   // Deserialize layout
 152   if (layout_bl.length()) {
 153     try {
 154       auto q = layout_bl.cbegin();
 155       decode(*layout, q);
 156     } catch (buffer::error &e) {
 157       return -EINVAL;
 158     }
 159   }
 160
 161   return 0;
 162 }
 163
 164 void ClsCephFSClient::build_tag_filter(
 165           const std::string &scrub_tag,
 166           bufferlist *out_bl)
 167 {
 168   ceph_assert(out_bl != NULL);
 169
 170   // Leading part of bl is un-versioned string naming the filter
 171   encode(std::string("cephfs.inode_tag"), *out_bl);
 172
 173   // Filter-specific part of the bl: in our case this is a versioned structure
 174   InodeTagFilterArgs args;
 175   args.scrub_tag = scrub_tag;
 176   args.encode(*out_bl);
 177 }