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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define ATRACE_TAG ATRACE_TAG_PACKAGE_MANAGER
#include "CacheTracker.h"
#include <fts.h>
#include <sys/xattr.h>
#include <utils/Trace.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include "QuotaUtils.h"
#include "utils.h"
using android::base::StringPrintf;
namespace android {
namespace installd {
CacheTracker::CacheTracker(userid_t userId, appid_t appId, const std::string& uuid)
: cacheUsed(0),
cacheQuota(0),
mUserId(userId),
mAppId(appId),
mItemsLoaded(false),
mUuid(uuid) {
}
CacheTracker::~CacheTracker() {
}
std::string CacheTracker::toString() {
return StringPrintf("UID=%d used=%" PRId64 " quota=%" PRId64 " ratio=%d",
multiuser_get_uid(mUserId, mAppId), cacheUsed, cacheQuota, getCacheRatio());
}
void CacheTracker::addDataPath(const std::string& dataPath) {
mDataPaths.push_back(dataPath);
}
void CacheTracker::loadStats() {
ATRACE_BEGIN("loadStats quota");
cacheUsed = 0;
if (loadQuotaStats()) {
return;
}
ATRACE_END();
ATRACE_BEGIN("loadStats tree");
cacheUsed = 0;
for (const auto& path : mDataPaths) {
auto cachePath = read_path_inode(path, "cache", kXattrInodeCache);
auto codeCachePath = read_path_inode(path, "code_cache", kXattrInodeCodeCache);
calculate_tree_size(cachePath, &cacheUsed);
calculate_tree_size(codeCachePath, &cacheUsed);
}
ATRACE_END();
}
bool CacheTracker::loadQuotaStats() {
int cacheGid = multiuser_get_cache_gid(mUserId, mAppId);
if (IsQuotaSupported(mUuid) && cacheGid != -1) {
int64_t space;
if ((space = GetOccupiedSpaceForGid(mUuid, cacheGid)) != -1) {
cacheUsed += space;
} else {
return false;
}
if ((space = get_occupied_app_cache_space_external(mUuid, mUserId, mAppId)) != -1) {
cacheUsed += space;
} else {
return false;
}
return true;
} else {
return false;
}
}
void CacheTracker::loadItemsFrom(const std::string& path) {
FTS *fts;
FTSENT *p;
char *argv[] = { (char*) path.c_str(), nullptr };
if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, nullptr))) {
PLOG(WARNING) << "Failed to fts_open " << path;
return;
}
while ((p = fts_read(fts)) != nullptr) {
if (p->fts_level == 0) continue;
// Create tracking nodes for everything we encounter
switch (p->fts_info) {
case FTS_D:
case FTS_DEFAULT:
case FTS_F:
case FTS_SL:
case FTS_SLNONE: {
auto item = std::shared_ptr<CacheItem>(new CacheItem(p));
p->fts_pointer = static_cast<void*>(item.get());
items.push_back(item);
}
}
switch (p->fts_info) {
case FTS_D: {
auto item = static_cast<CacheItem*>(p->fts_pointer);
item->group |= (getxattr(p->fts_path, kXattrCacheGroup, nullptr, 0) >= 0);
item->tombstone |= (getxattr(p->fts_path, kXattrCacheTombstone, nullptr, 0) >= 0);
// When group, immediately collect all files under tree
if (item->group) {
while ((p = fts_read(fts)) != nullptr) {
if (p->fts_info == FTS_DP && p->fts_level == item->level) break;
switch (p->fts_info) {
case FTS_D:
case FTS_DEFAULT:
case FTS_F:
case FTS_SL:
case FTS_SLNONE:
item->size += p->fts_statp->st_blocks * 512;
item->modified = std::max(item->modified, p->fts_statp->st_mtime);
}
}
}
}
}
// Bubble up modified time to parent
CHECK(p != nullptr);
switch (p->fts_info) {
case FTS_DP:
case FTS_DEFAULT:
case FTS_F:
case FTS_SL:
case FTS_SLNONE: {
auto item = static_cast<CacheItem*>(p->fts_pointer);
auto parent = static_cast<CacheItem*>(p->fts_parent->fts_pointer);
if (parent) {
parent->modified = std::max(parent->modified, item->modified);
}
}
}
}
fts_close(fts);
}
void CacheTracker::loadItems() {
items.clear();
ATRACE_BEGIN("loadItems");
for (const auto& path : mDataPaths) {
loadItemsFrom(read_path_inode(path, "cache", kXattrInodeCache));
loadItemsFrom(read_path_inode(path, "code_cache", kXattrInodeCodeCache));
}
ATRACE_END();
ATRACE_BEGIN("sortItems");
auto cmp = [](std::shared_ptr<CacheItem> left, std::shared_ptr<CacheItem> right) {
// TODO: sort dotfiles last
// TODO: sort code_cache last
if (left->modified != right->modified) {
return (left->modified > right->modified);
}
if (left->level != right->level) {
return (left->level < right->level);
}
return left->directory;
};
std::stable_sort(items.begin(), items.end(), cmp);
ATRACE_END();
}
void CacheTracker::ensureItems() {
if (mItemsLoaded) {
return;
} else {
loadItems();
mItemsLoaded = true;
}
}
int CacheTracker::getCacheRatio() {
if (cacheQuota == 0) {
return 0;
} else {
return (cacheUsed * 10000) / cacheQuota;
}
}
} // namespace installd
} // namespace android