/* 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)
{
const char *name;
int dfd, subfd;
DIR *d;
struct dirent *de;
int64_t avail;
char datadir[PKG_PATH_MAX];//ALPS00106329 +
avail = disk_free();
if (avail < 0) return -1;
LOGI("free_cache(%" PRId64 ") avail %" PRId64 "\n", free_size, avail);
if (avail >= free_size) return 0;
//ALPS00106329 +
if (create_persona_path(datadir, 0)) {
LOGE("couldn't get directory for persona 0");
return -1;
}
d = opendir(datadir);
//ALPS00106329 -
if (d == NULL) {
LOGE("cannot open %s: %s\n", datadir, strerror(errno));//ALPS00106329 +
return -1;
}
dfd = dirfd(d);
while ((de = readdir(d))) {
if (de->d_type != DT_DIR) continue;
name = de->d_name;
/* always skip "." and ".." */
if (name[0] == '.') {
if (name[1] == 0) continue;
if ((name[1] == '.') && (name[2] == 0)) continue;
}
subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
if (subfd < 0) continue;
delete_dir_contents_fd(subfd, "cache");
close(subfd);
avail = disk_free();
if (avail >= free_size) {
closedir(d);
return 0;
}
}
closedir(d);
/* Fail case - not possible to free space */
return -1;
}
/* 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(int free_size)
{
const char *name;
int dfd, subfd;
DIR *d;
struct dirent *de;
int avail;
avail = disk_free();
if (avail < 0) return -1;
LOGI("free_cache(%d) avail %d\n", free_size, avail);
if (avail >= free_size) return 0;
d = opendir(PKG_DIR_PREFIX);
if (d == NULL) {
LOGE("cannot open %s\n", PKG_DIR_PREFIX);
return -1;
}
dfd = dirfd(d);
while ((de = readdir(d))) {
if (de->d_type != DT_DIR) continue;
name = de->d_name;
/* always skip "." and ".." */
if (name[0] == '.') {
if (name[1] == 0) continue;
if ((name[1] == '.') && (name[2] == 0)) continue;
}
subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
if (subfd < 0) continue;
delete_dir_contents_fd(subfd, "cache");
close(subfd);
avail = disk_free();
if (avail >= free_size) {
closedir(d);
return 0;
}
}
closedir(d);
/* Fail case - not possible to free space */
return -1;
}