Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * High-level sync()-related operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/sched/xacct.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/writeback.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/quotaops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/backing-dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 			SYNC_FILE_RANGE_WAIT_AFTER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  * Do the filesystem syncing work. For simple filesystems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  * writeback_inodes_sb(sb) just dirties buffers with inodes so we have to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * submit IO for these buffers via __sync_blockdev(). This also speeds up the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  * wait == 1 case since in that case write_inode() functions do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  * sync_dirty_buffer() and thus effectively write one block at a time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static int __sync_filesystem(struct super_block *sb, int wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	if (wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		sync_inodes_sb(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		writeback_inodes_sb(sb, WB_REASON_SYNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	if (sb->s_op->sync_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		sb->s_op->sync_fs(sb, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	return __sync_blockdev(sb->s_bdev, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44)  * Write out and wait upon all dirty data associated with this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45)  * superblock.  Filesystem data as well as the underlying block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46)  * device.  Takes the superblock lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) int sync_filesystem(struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	 * We need to be protected against the filesystem going from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	 * r/o to r/w or vice versa.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	WARN_ON(!rwsem_is_locked(&sb->s_umount));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	 * No point in syncing out anything if the filesystem is read-only.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	if (sb_rdonly(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	ret = __sync_filesystem(sb, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	return __sync_filesystem(sb, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) EXPORT_SYMBOL_NS(sync_filesystem, ANDROID_GKI_VFS_EXPORT_ONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) static void sync_inodes_one_sb(struct super_block *sb, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	if (!sb_rdonly(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		sync_inodes_sb(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) static void sync_fs_one_sb(struct super_block *sb, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (!sb_rdonly(sb) && !(sb->s_iflags & SB_I_SKIP_SYNC) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	    sb->s_op->sync_fs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		sb->s_op->sync_fs(sb, *(int *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) static void fdatawrite_one_bdev(struct block_device *bdev, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	filemap_fdatawrite(bdev->bd_inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) static void fdatawait_one_bdev(struct block_device *bdev, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	 * We keep the error status of individual mapping so that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	 * applications can catch the writeback error using fsync(2).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	 * See filemap_fdatawait_keep_errors() for details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	filemap_fdatawait_keep_errors(bdev->bd_inode->i_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)  * Sync everything. We start by waking flusher threads so that most of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  * writeback runs on all devices in parallel. Then we sync all inodes reliably
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  * which effectively also waits for all flusher threads to finish doing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)  * writeback. At this point all data is on disk so metadata should be stable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)  * and we tell filesystems to sync their metadata via ->sync_fs() calls.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)  * Finally, we writeout all block devices because some filesystems (e.g. ext2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)  * just write metadata (such as inodes or bitmaps) to block device page cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)  * and do not sync it on their own in ->sync_fs().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) void ksys_sync(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	int nowait = 0, wait = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	wakeup_flusher_threads(WB_REASON_SYNC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	iterate_supers(sync_inodes_one_sb, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	iterate_supers(sync_fs_one_sb, &nowait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	iterate_supers(sync_fs_one_sb, &wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	iterate_bdevs(fdatawrite_one_bdev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	iterate_bdevs(fdatawait_one_bdev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (unlikely(laptop_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		laptop_sync_completion();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) SYSCALL_DEFINE0(sync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	ksys_sync();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static void do_sync_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	int nowait = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	 * Sync twice to reduce the possibility we skipped some inodes / pages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	 * because they were temporarily locked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	iterate_supers(sync_inodes_one_sb, &nowait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	iterate_supers(sync_fs_one_sb, &nowait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	iterate_bdevs(fdatawrite_one_bdev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	iterate_supers(sync_inodes_one_sb, &nowait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	iterate_supers(sync_fs_one_sb, &nowait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	iterate_bdevs(fdatawrite_one_bdev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	printk("Emergency Sync complete\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	kfree(work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) void emergency_sync(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	struct work_struct *work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	work = kmalloc(sizeof(*work), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (work) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		INIT_WORK(work, do_sync_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		schedule_work(work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)  * sync a single super
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) SYSCALL_DEFINE1(syncfs, int, fd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	struct fd f = fdget(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	struct super_block *sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	int ret, ret2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	if (!f.file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		return -EBADF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	sb = f.file->f_path.dentry->d_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	down_read(&sb->s_umount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	ret = sync_filesystem(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	up_read(&sb->s_umount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	ret2 = errseq_check_and_advance(&sb->s_wb_err, &f.file->f_sb_err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	fdput(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	return ret ? ret : ret2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  * vfs_fsync_range - helper to sync a range of data & metadata to disk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  * @file:		file to sync
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  * @start:		offset in bytes of the beginning of data range to sync
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  * @end:		offset in bytes of the end of data range (inclusive)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)  * @datasync:		perform only datasync
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)  * Write back data in range @start..@end and metadata for @file to disk.  If
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  * @datasync is set only metadata needed to access modified file data is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)  * written.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) int vfs_fsync_range(struct file *file, loff_t start, loff_t end, int datasync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	struct inode *inode = file->f_mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	if (!file->f_op->fsync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	if (!datasync && (inode->i_state & I_DIRTY_TIME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		mark_inode_dirty_sync(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	return file->f_op->fsync(file, start, end, datasync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) EXPORT_SYMBOL(vfs_fsync_range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)  * vfs_fsync - perform a fsync or fdatasync on a file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)  * @file:		file to sync
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)  * @datasync:		only perform a fdatasync operation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)  * Write back data and metadata for @file to disk.  If @datasync is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)  * set only metadata needed to access modified file data is written.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) int vfs_fsync(struct file *file, int datasync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	return vfs_fsync_range(file, 0, LLONG_MAX, datasync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) EXPORT_SYMBOL(vfs_fsync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static int do_fsync(unsigned int fd, int datasync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	struct fd f = fdget(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	int ret = -EBADF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	if (f.file) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		ret = vfs_fsync(f.file, datasync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		fdput(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		inc_syscfs(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) SYSCALL_DEFINE1(fsync, unsigned int, fd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	return do_fsync(fd, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return do_fsync(fd, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) int sync_file_range(struct file *file, loff_t offset, loff_t nbytes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		    unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	struct address_space *mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	loff_t endbyte;			/* inclusive */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	umode_t i_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	if (flags & ~VALID_FLAGS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	endbyte = offset + nbytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	if ((s64)offset < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	if ((s64)endbyte < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	if (endbyte < offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	if (sizeof(pgoff_t) == 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		if (offset >= (0x100000000ULL << PAGE_SHIFT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 			 * The range starts outside a 32 bit machine's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			 * pagecache addressing capabilities.  Let it "succeed"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 			ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		if (endbyte >= (0x100000000ULL << PAGE_SHIFT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 			 * Out to EOF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 			nbytes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	if (nbytes == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		endbyte = LLONG_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		endbyte--;		/* inclusive */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	i_mode = file_inode(file)->i_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	ret = -ESPIPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	if (!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISDIR(i_mode) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 			!S_ISLNK(i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	mapping = file->f_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		ret = file_fdatawait_range(file, offset, endbyte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	if (flags & SYNC_FILE_RANGE_WRITE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		int sync_mode = WB_SYNC_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		if ((flags & SYNC_FILE_RANGE_WRITE_AND_WAIT) ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			     SYNC_FILE_RANGE_WRITE_AND_WAIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			sync_mode = WB_SYNC_ALL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		ret = __filemap_fdatawrite_range(mapping, offset, endbyte,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 						 sync_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	if (flags & SYNC_FILE_RANGE_WAIT_AFTER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		ret = file_fdatawait_range(file, offset, endbyte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)  * ksys_sync_file_range() permits finely controlled syncing over a segment of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)  * a file in the range offset .. (offset+nbytes-1) inclusive.  If nbytes is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)  * zero then ksys_sync_file_range() will operate from offset out to EOF.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)  * The flag bits are:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)  * SYNC_FILE_RANGE_WAIT_BEFORE: wait upon writeout of all pages in the range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)  * before performing the write.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)  * SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)  * range which are not presently under writeback. Note that this may block for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)  * significant periods due to exhaustion of disk request structures.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)  * SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)  * after performing the write.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)  * Useful combinations of the flag bits are:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)  * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE: ensures that all pages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)  * in the range which were dirty on entry to ksys_sync_file_range() are placed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)  * under writeout.  This is a start-write-for-data-integrity operation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)  * SYNC_FILE_RANGE_WRITE: start writeout of all dirty pages in the range which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)  * are not presently under writeout.  This is an asynchronous flush-to-disk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)  * operation.  Not suitable for data integrity operations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)  * SYNC_FILE_RANGE_WAIT_BEFORE (or SYNC_FILE_RANGE_WAIT_AFTER): wait for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)  * completion of writeout of all pages in the range.  This will be used after an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)  * earlier SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE operation to wait
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)  * for that operation to complete and to return the result.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)  * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE|SYNC_FILE_RANGE_WAIT_AFTER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)  * (a.k.a. SYNC_FILE_RANGE_WRITE_AND_WAIT):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)  * a traditional sync() operation.  This is a write-for-data-integrity operation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)  * which will ensure that all pages in the range which were dirty on entry to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)  * ksys_sync_file_range() are written to disk.  It should be noted that disk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)  * caches are not flushed by this call, so there are no guarantees here that the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)  * data will be available on disk after a crash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)  * SYNC_FILE_RANGE_WAIT_BEFORE and SYNC_FILE_RANGE_WAIT_AFTER will detect any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)  * I/O errors or ENOSPC conditions and will return those to the caller, after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)  * clearing the EIO and ENOSPC flags in the address_space.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)  * It should be noted that none of these operations write out the file's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)  * metadata.  So unless the application is strictly performing overwrites of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)  * already-instantiated disk blocks, there are no guarantees here that the data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)  * will be available after a crash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) int ksys_sync_file_range(int fd, loff_t offset, loff_t nbytes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 			 unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	struct fd f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	ret = -EBADF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	f = fdget(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	if (f.file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		ret = sync_file_range(f.file, offset, nbytes, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	fdput(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 				unsigned int, flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	return ksys_sync_file_range(fd, offset, nbytes, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) /* It would be nice if people remember that not all the world's an i386
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)    when they introduce new system calls */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) SYSCALL_DEFINE4(sync_file_range2, int, fd, unsigned int, flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 				 loff_t, offset, loff_t, nbytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	return ksys_sync_file_range(fd, offset, nbytes, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }