158 lines
4.6 KiB
C
158 lines
4.6 KiB
C
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <string.h>
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#include <limits.h>
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#include <linux/fs.h>
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#include <time.h>
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#include <fs_mgr.h>
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#include <pthread.h>
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#define LOG_TAG "fstrim"
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#include "cutils/log.h"
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#include "hardware_legacy/power.h"
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/* These numbers must match what the MountService specified in
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* frameworks/base/services/java/com/android/server/EventLogTags.logtags
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*/
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#define LOG_FSTRIM_START 2755
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#define LOG_FSTRIM_FINISH 2756
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#define FSTRIM_WAKELOCK "dofstrim"
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#define UNUSED __attribute__((unused))
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static unsigned long long get_boot_time_ms(void)
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{
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struct timespec t;
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unsigned long long time_ms;
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t.tv_sec = 0;
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t.tv_nsec = 0;
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clock_gettime(CLOCK_BOOTTIME, &t);
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time_ms = (t.tv_sec * 1000LL) + (t.tv_nsec / 1000000);
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return time_ms;
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}
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static void *do_fstrim_filesystems(void *ignored UNUSED)
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{
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int i;
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int fd;
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int ret = 0;
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struct fstrim_range range = { 0 };
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struct stat sb;
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extern struct fstab *fstab;
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SLOGI("Starting fstrim work...\n");
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/* Log the start time in the event log */
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LOG_EVENT_LONG(LOG_FSTRIM_START, get_boot_time_ms());
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for (i = 0; i < fstab->num_entries; i++) {
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/* Skip raw partitions */
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if (!strcmp(fstab->recs[i].fs_type, "emmc") ||
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!strcmp(fstab->recs[i].fs_type, "mtd")) {
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continue;
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}
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/* Skip read-only filesystems */
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if (fstab->recs[i].flags & MS_RDONLY) {
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continue;
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}
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if (fs_mgr_is_voldmanaged(&fstab->recs[i])) {
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continue; /* Should we trim fat32 filesystems? */
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}
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if (stat(fstab->recs[i].mount_point, &sb) == -1) {
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SLOGE("Cannot stat mount point %s\n", fstab->recs[i].mount_point);
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ret = -1;
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continue;
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}
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if (!S_ISDIR(sb.st_mode)) {
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SLOGE("%s is not a directory\n", fstab->recs[i].mount_point);
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ret = -1;
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continue;
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}
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fd = open(fstab->recs[i].mount_point, O_RDONLY);
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if (fd < 0) {
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SLOGE("Cannot open %s for FITRIM\n", fstab->recs[i].mount_point);
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ret = -1;
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continue;
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}
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memset(&range, 0, sizeof(range));
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range.len = ULLONG_MAX;
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SLOGI("Invoking FITRIM ioctl on %s", fstab->recs[i].mount_point);
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if (ioctl(fd, FITRIM, &range)) {
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SLOGE("FITRIM ioctl failed on %s", fstab->recs[i].mount_point);
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ret = -1;
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} else {
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SLOGI("Trimmed %llu bytes on %s\n", range.len, fstab->recs[i].mount_point);
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}
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close(fd);
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}
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/* Log the finish time in the event log */
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LOG_EVENT_LONG(LOG_FSTRIM_FINISH, get_boot_time_ms());
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SLOGI("Finished fstrim work.\n");
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/* Release the wakelock that let us work */
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release_wake_lock(FSTRIM_WAKELOCK);
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return (void *)(uintptr_t)ret;
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}
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int fstrim_filesystems(void)
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{
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pthread_t t;
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int ret;
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/* Get a wakelock as this may take a while, and we don't want the
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* device to sleep on us.
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*/
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acquire_wake_lock(PARTIAL_WAKE_LOCK, FSTRIM_WAKELOCK);
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/* Depending on the emmc chip and size, this can take upwards
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* of a few minutes. If done in the same thread as the caller
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* of this function, that would block vold from accepting any
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* commands until the trim is finished. So start another thread
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* to do the work, and return immediately.
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*
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* This function should not be called more than once per day, but
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* even if it is called a second time before the first one finishes,
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* the kernel will "do the right thing" and split the work between
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* the two ioctls invoked in separate threads.
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*/
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ret = pthread_create(&t, NULL, do_fstrim_filesystems, NULL);
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if (ret) {
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SLOGE("Cannot create thread to do fstrim");
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return ret;
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}
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ret = pthread_detach(t);
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if (ret) {
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SLOGE("Cannot detach thread doing fstrim");
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return ret;
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}
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return 0;
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}
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