X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Ftools%2Fcephfs%2FPgFiles.cc;fp=src%2Fceph%2Fsrc%2Ftools%2Fcephfs%2FPgFiles.cc;h=0c0436419b8af1a6b67aa5e4a223e8b0434c000e;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/tools/cephfs/PgFiles.cc b/src/ceph/src/tools/cephfs/PgFiles.cc
new file mode 100644
index 0000000..0c04364
--- /dev/null
+++ b/src/ceph/src/tools/cephfs/PgFiles.cc
@@ -0,0 +1,194 @@
+// -*- 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) 2016 Red Hat
+ *
+ * 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 "common/errno.h"
+#include "osdc/Striper.h"
+
+#include "PgFiles.h"
+
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_mds
+#undef dout_prefix
+#define dout_prefix *_dout << "pgeffects." << __func__ << ": "
+
+int PgFiles::init()
+{
+  int r = ceph_create_with_context(&cmount, g_ceph_context);
+  if (r != 0) {
+    return r;
+  }
+
+  return ceph_init(cmount);
+}
+
+PgFiles::PgFiles(Objecter *o, std::set<pg_t> pgs_)
+  : objecter(o), pgs(pgs_)
+{
+  for (const auto &i : pgs) {
+    pools.insert(i.m_pool);
+  }
+}
+
+PgFiles::~PgFiles()
+{
+  ceph_release(cmount);
+}
+
+void PgFiles::hit_dir(std::string const &path)
+{
+  dout(10) << "entering " << path << dendl;
+
+  ceph_dir_result *dr = nullptr;
+  int r = ceph_opendir(cmount, path.c_str(), &dr);
+  if (r != 0) {
+    derr << "Failed to open path: " << cpp_strerror(r) << dendl;
+    return;
+  }
+
+  struct dirent de;
+  while((r = ceph_readdir_r(cmount, dr, &de)) != 0) {
+    if (r < 0) {
+      derr << "Error reading path " << path << ": " << cpp_strerror(r)
+           << dendl;
+      ceph_closedir(cmount, dr); // best effort, ignore r
+      return;
+    }
+
+    if (std::string(de.d_name) == "." || std::string(de.d_name) == "..") {
+      continue;
+    }
+
+    struct ceph_statx stx;
+    std::string de_path = (path + std::string("/") + de.d_name);
+    r = ceph_statx(cmount, de_path.c_str(), &stx,
+		    CEPH_STATX_INO|CEPH_STATX_SIZE, 0);
+    if (r != 0) {
+      derr << "Failed to stat path " << de_path << ": "
+            << cpp_strerror(r) << dendl;
+      // Don't hold up the whole process for one bad inode
+      continue;
+    }
+
+    if (S_ISREG(stx.stx_mode)) {
+      hit_file(de_path, stx);
+    } else if (S_ISDIR(stx.stx_mode)) {
+      hit_dir(de_path);
+    } else {
+      dout(20) << "Skipping non reg/dir file: " << de_path << dendl;
+    }
+  }
+
+  r = ceph_closedir(cmount, dr);
+  if (r != 0) {
+    derr << "Error closing path " << path << ": " << cpp_strerror(r) << dendl;
+    return;
+  }
+}
+
+void PgFiles::hit_file(std::string const &path, const struct ceph_statx &stx)
+{
+  assert(S_ISREG(stx.stx_mode));
+
+  dout(20) << "Hitting file '" << path << "'" << dendl;
+
+  int l_stripe_unit = 0;
+  int l_stripe_count = 0;
+  int l_object_size = 0;
+  int l_pool_id = 0;
+  int r = ceph_get_path_layout(cmount, path.c_str(), &l_stripe_unit,
+                               &l_stripe_count, &l_object_size,
+                               &l_pool_id);
+  if (r != 0) {
+    derr << "Error reading layout on " << path << ": " << cpp_strerror(r)
+         << dendl;
+    return;
+  }
+
+  struct file_layout_t layout;
+  layout.stripe_unit = l_stripe_unit;
+  layout.stripe_count = l_stripe_count;
+  layout.object_size = l_object_size;
+  layout.pool_id = l_pool_id;
+
+  // Avoid calculating PG if the layout targeted a completely different pool
+  if (pools.count(layout.pool_id) == 0) {
+    dout(20) << "Fast check missed: pool " << layout.pool_id << " not in "
+                "target set" << dendl;
+    return;
+  }
+
+  auto num_objects = Striper::get_num_objects(layout, stx.stx_size);
+
+  for (uint64_t i = 0; i < num_objects; ++i) {
+    char buf[32];
+    snprintf(buf, sizeof(buf), "%llx.%08llx", (long long unsigned)stx.stx_ino,
+                                              (long long unsigned int)i);
+    dout(20) << "  object " << std::string(buf) << dendl;
+
+    pg_t target;
+    object_t oid;
+    object_locator_t loc;
+    loc.pool = layout.pool_id;
+    loc.key = std::string(buf);
+
+    unsigned pg_num_mask = 0;
+    unsigned pg_num = 0;
+
+    int r = 0;
+    objecter->with_osdmap([&r, oid, loc, &target, &pg_num_mask, &pg_num]
+                          (const OSDMap &osd_map) {
+      r = osd_map.object_locator_to_pg(oid, loc, target);
+      if (r == 0) {
+        auto pool = osd_map.get_pg_pool(loc.pool);
+        pg_num_mask = pool->get_pg_num_mask();
+        pg_num = pool->get_pg_num();
+      }
+    });
+    if (r != 0) {
+      // Can happen if layout pointed to pool not in osdmap, for example
+      continue;
+    }
+
+    target.m_seed = ceph_stable_mod(target.ps(), pg_num, pg_num_mask);
+
+    dout(20) << "  target " << target << dendl;
+
+    if (pgs.count(target)) {
+      std::cout << path << std::endl;
+      return;
+    }
+  }
+  
+}
+
+int PgFiles::scan_path(std::string const &path)
+{
+  int r = ceph_mount(cmount, "/");
+  if (r != 0) {
+    derr << "Failed to mount: " << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  hit_dir(path);
+
+  r = ceph_unmount(cmount);
+  if (r != 0) {
+    derr << "Failed to unmount: " << cpp_strerror(r) << dendl;
+    return r;
+  }
+
+  return r;
+}
+