/* * Sync all the data for all the filesystems (called by sys_sync() and * emergency sync) */ void sync_filesystems(int wait) { iterate_supers(sync_inodes_one_sb, NULL); iterate_supers(sync_fs_one_sb, &wait); iterate_supers(sync_fs_one_sb, &wait); iterate_bdevs(fdatawrite_one_bdev, NULL); iterate_bdevs(fdatawait_one_bdev, NULL); }
/* * Sync everything. We start by waking flusher threads so that most of * writeback runs on all devices in parallel. Then we sync all inodes reliably * which effectively also waits for all flusher threads to finish doing * writeback. At this point all data is on disk so metadata should be stable * and we tell filesystems to sync their metadata via ->sync_fs() calls. * Finally, we writeout all block devices because some filesystems (e.g. ext2) * just write metadata (such as inodes or bitmaps) to block device page cache * and do not sync it on their own in ->sync_fs(). */ static void do_sync(void) { int nowait = 0, wait = 1; wakeup_flusher_threads(0, WB_REASON_SYNC); iterate_supers(sync_inodes_one_sb, NULL); iterate_supers(sync_fs_one_sb, &nowait); iterate_supers(sync_fs_one_sb, &wait); iterate_bdevs(fdatawrite_one_bdev, NULL); iterate_bdevs(fdatawait_one_bdev, NULL); if (unlikely(laptop_mode)) laptop_sync_completion(); return; }
static void do_sync_work(struct work_struct *work) { int nowait = 0; /* * Sync twice to reduce the possibility we skipped some inodes / pages * because they were temporarily locked */ iterate_supers(sync_inodes_one_sb, &nowait); iterate_supers(sync_fs_one_sb, &nowait); iterate_bdevs(fdatawrite_one_bdev, NULL); iterate_supers(sync_inodes_one_sb, &nowait); iterate_supers(sync_fs_one_sb, &nowait); iterate_bdevs(fdatawrite_one_bdev, NULL); printk("Emergency Sync complete\n"); kfree(work); }
static void do_sync_work(struct work_struct *work) { int nowait = 0; /* * Sync twice to reduce the possibility we skipped some inodes / pages * because they were temporarily locked */ #ifdef CONFIG_POWER_OFF_BATTERY_LOG blocking_notifier_call_chain(&fs_notifier_list, 0, "Emergency Sync"); #endif iterate_supers(sync_inodes_one_sb, &nowait); iterate_supers(sync_fs_one_sb, &nowait); iterate_bdevs(fdatawrite_one_bdev, NULL); iterate_supers(sync_inodes_one_sb, &nowait); iterate_supers(sync_fs_one_sb, &nowait); iterate_bdevs(fdatawrite_one_bdev, NULL); printk("Emergency Sync complete\n"); kfree(work); }