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// -*- 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, const 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)
{
ceph_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;
}
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