void clear_cache_files(cache_t* cache, int64_t free_size)
{
size_t i;
int skip = 0;
char path[PATH_MAX];
ALOGI("Collected cache files: %d directories, %d files",
cache->numDirs, cache->numFiles);
CACHE_NOISY(ALOGI("Sorting files..."));
qsort(cache->files, cache->numFiles, sizeof(cache_file_t*),
cache_modtime_sort);
CACHE_NOISY(ALOGI("Cleaning empty directories..."));
for (i=cache->numDirs; i>0; i--) {
cache_dir_t* dir = cache->dirs[i-1];
if (dir->childCount <= 0 && !dir->deleted) {
delete_cache_dir(path, dir);
}
}
CACHE_NOISY(ALOGI("Trimming files..."));
for (i=0; i<cache->numFiles; i++) {
skip++;
if (skip > 10) {
if (data_disk_free() > free_size) {
return;
}
skip = 0;
}
cache_file_t* file = cache->files[i];
strcpy(create_dir_path(path, file->dir), file->name);
ALOGI("DEL (mod %d) %s\n", (int)file->modTime, path);
if (unlink(path) < 0) {
ALOGE("Couldn't unlink %s: %s\n", path, strerror(errno));
}
file->dir->childCount--;
if (file->dir->childCount <= 0) {
delete_cache_dir(path, file->dir);
}
}
}
/* Try to ensure free_size bytes of storage are available.
* Returns 0 on success.
* This is rather simple-minded because doing a full LRU would
* be potentially memory-intensive, and without atime it would
* also require that apps constantly modify file metadata even
* when just reading from the cache, which is pretty awful.
*/
int free_cache(int64_t free_size)
{
cache_t* cache;
int64_t avail;
DIR *d;
struct dirent *de;
char tmpdir[PATH_MAX];
char *dirpos;
avail = data_disk_free();
if (avail < 0) return -1;
ALOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
if (avail >= free_size) return 0;
cache = start_cache_collection();
// Collect cache files for primary user.
if (create_persona_path(tmpdir, 0) == 0) {
//ALOGI("adding cache files from %s\n", tmpdir);
add_cache_files(cache, tmpdir, "cache");
}
// Search for other users and add any cache files from them.
snprintf(tmpdir, sizeof(tmpdir), "%s%s", android_data_dir.path,
SECONDARY_USER_PREFIX);
dirpos = tmpdir + strlen(tmpdir);
d = opendir(tmpdir);
if (d != NULL) {
while ((de = readdir(d))) {
if (de->d_type == DT_DIR) {
const char *name = de->d_name;
/* always skip "." and ".." */
if (name[0] == '.') {
if (name[1] == 0) continue;
if ((name[1] == '.') && (name[2] == 0)) continue;
}
if ((strlen(name)+(dirpos-tmpdir)) < (sizeof(tmpdir)-1)) {
strcpy(dirpos, name);
//ALOGI("adding cache files from %s\n", tmpdir);
add_cache_files(cache, tmpdir, "cache");
} else {
ALOGW("Path exceeds limit: %s%s", tmpdir, name);
}
}
}
closedir(d);
}
// Collect cache files on external storage for all users (if it is mounted as part
// of the internal storage).
strcpy(tmpdir, android_media_dir.path);
dirpos = tmpdir + strlen(tmpdir);
d = opendir(tmpdir);
if (d != NULL) {
while ((de = readdir(d))) {
if (de->d_type == DT_DIR) {
const char *name = de->d_name;
/* skip any dir that doesn't start with a number, so not a user */
if (name[0] < '0' || name[0] > '9') {
continue;
}
if ((strlen(name)+(dirpos-tmpdir)) < (sizeof(tmpdir)-1)) {
strcpy(dirpos, name);
if (lookup_media_dir(tmpdir, "Android") == 0
&& lookup_media_dir(tmpdir, "data") == 0) {
//ALOGI("adding cache files from %s\n", tmpdir);
add_cache_files(cache, tmpdir, "cache");
}
} else {
ALOGW("Path exceeds limit: %s%s", tmpdir, name);
}
}
}
closedir(d);
}
clear_cache_files(cache, free_size);
finish_cache_collection(cache);
return data_disk_free() >= free_size ? 0 : -1;
}
