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/*
* Copyright (C) 2013 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.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <string.h>
#include <limits.h>
#include <linux/fs.h>
#include <time.h>
#include <fs_mgr.h>
#include <pthread.h>
#define LOG_TAG "fstrim"
#include "cutils/log.h"
#include "hardware_legacy/power.h"
/* These numbers must match what the MountService specified in
* frameworks/base/services/java/com/android/server/EventLogTags.logtags
*/
#define LOG_FSTRIM_START 2755
#define LOG_FSTRIM_FINISH 2756
#define FSTRIM_WAKELOCK "dofstrim"
#define UNUSED __attribute__((unused))
/* From a would-be kernel header */
#define FIDTRIM _IOWR('f', 128, struct fstrim_range) /* Deep discard trim */
static unsigned long long get_boot_time_ms(void)
{
struct timespec t;
unsigned long long time_ms;
t.tv_sec = 0;
t.tv_nsec = 0;
clock_gettime(CLOCK_BOOTTIME, &t);
time_ms = (t.tv_sec * 1000LL) + (t.tv_nsec / 1000000);
return time_ms;
}
static void *do_fstrim_filesystems(void *thread_arg)
{
int i;
int fd;
int ret = 0;
struct fstrim_range range = { 0 };
struct stat sb;
extern struct fstab *fstab;
int deep_trim = !!thread_arg;
SLOGI("Starting fstrim work...\n");
/* Log the start time in the event log */
LOG_EVENT_LONG(LOG_FSTRIM_START, get_boot_time_ms());
for (i = 0; i < fstab->num_entries; i++) {
/* Skip raw partitions */
if (!strcmp(fstab->recs[i].fs_type, "emmc") ||
!strcmp(fstab->recs[i].fs_type, "mtd")) {
continue;
}
/* Skip read-only filesystems */
if (fstab->recs[i].flags & MS_RDONLY) {
continue;
}
if (fs_mgr_is_voldmanaged(&fstab->recs[i])) {
continue; /* Should we trim fat32 filesystems? */
}
if (stat(fstab->recs[i].mount_point, &sb) == -1) {
SLOGE("Cannot stat mount point %s\n", fstab->recs[i].mount_point);
ret = -1;
continue;
}
if (!S_ISDIR(sb.st_mode)) {
SLOGE("%s is not a directory\n", fstab->recs[i].mount_point);
ret = -1;
continue;
}
fd = open(fstab->recs[i].mount_point, O_RDONLY);
if (fd < 0) {
SLOGE("Cannot open %s for FITRIM\n", fstab->recs[i].mount_point);
ret = -1;
continue;
}
memset(&range, 0, sizeof(range));
range.len = ULLONG_MAX;
SLOGI("Invoking %s ioctl on %s", deep_trim ? "FIDTRIM" : "FITRIM", fstab->recs[i].mount_point);
ret = ioctl(fd, deep_trim ? FIDTRIM : FITRIM, &range);
if (ret) {
SLOGE("%s ioctl failed on %s (error %d/%s)", deep_trim ? "FIDTRIM" : "FITRIM", fstab->recs[i].mount_point, errno, strerror(errno));
ret = -1;
} else {
SLOGI("Trimmed %llu bytes on %s\n", range.len, fstab->recs[i].mount_point);
}
close(fd);
}
/* Log the finish time in the event log */
LOG_EVENT_LONG(LOG_FSTRIM_FINISH, get_boot_time_ms());
SLOGI("Finished fstrim work.\n");
/* Release the wakelock that let us work */
release_wake_lock(FSTRIM_WAKELOCK);
return (void *)(uintptr_t)ret;
}
int fstrim_filesystems(int deep_trim)
{
pthread_t t;
int ret;
/* Get a wakelock as this may take a while, and we don't want the
* device to sleep on us.
*/
acquire_wake_lock(PARTIAL_WAKE_LOCK, FSTRIM_WAKELOCK);
/* Depending on the emmc chip and size, this can take upwards
* of a few minutes. If done in the same thread as the caller
* of this function, that would block vold from accepting any
* commands until the trim is finished. So start another thread
* to do the work, and return immediately.
*
* This function should not be called more than once per day, but
* even if it is called a second time before the first one finishes,
* the kernel will "do the right thing" and split the work between
* the two ioctls invoked in separate threads.
*/
ret = pthread_create(&t, NULL, do_fstrim_filesystems, (void *)(intptr_t)deep_trim);
if (ret) {
SLOGE("Cannot create thread to do fstrim");
return ret;
}
ret = pthread_detach(t);
if (ret) {
SLOGE("Cannot detach thread doing fstrim");
return ret;
}
return 0;
}
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