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-rw-r--r--fs/sync.c391
1 files changed, 391 insertions, 0 deletions
diff --git a/fs/sync.c b/fs/sync.c
new file mode 100644
index 000000000..dc725914e
--- /dev/null
+++ b/fs/sync.c
@@ -0,0 +1,391 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * High-level sync()-related operations
+ */
+
+#include <linux/blkdev.h>
+#include <linux/kernel.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <linux/namei.h>
+#include <linux/sched.h>
+#include <linux/writeback.h>
+#include <linux/syscalls.h>
+#include <linux/linkage.h>
+#include <linux/pagemap.h>
+#include <linux/quotaops.h>
+#include <linux/backing-dev.h>
+#include "internal.h"
+
+#define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
+ SYNC_FILE_RANGE_WAIT_AFTER)
+
+/*
+ * Write out and wait upon all dirty data associated with this
+ * superblock. Filesystem data as well as the underlying block
+ * device. Takes the superblock lock.
+ */
+int sync_filesystem(struct super_block *sb)
+{
+ int ret = 0;
+
+ /*
+ * We need to be protected against the filesystem going from
+ * r/o to r/w or vice versa.
+ */
+ WARN_ON(!rwsem_is_locked(&sb->s_umount));
+
+ /*
+ * No point in syncing out anything if the filesystem is read-only.
+ */
+ if (sb_rdonly(sb))
+ return 0;
+
+ /*
+ * Do the filesystem syncing work. For simple filesystems
+ * writeback_inodes_sb(sb) just dirties buffers with inodes so we have
+ * to submit I/O for these buffers via sync_blockdev(). This also
+ * speeds up the wait == 1 case since in that case write_inode()
+ * methods call sync_dirty_buffer() and thus effectively write one block
+ * at a time.
+ */
+ writeback_inodes_sb(sb, WB_REASON_SYNC);
+ if (sb->s_op->sync_fs) {
+ ret = sb->s_op->sync_fs(sb, 0);
+ if (ret)
+ return ret;
+ }
+ ret = sync_blockdev_nowait(sb->s_bdev);
+ if (ret)
+ return ret;
+
+ sync_inodes_sb(sb);
+ if (sb->s_op->sync_fs) {
+ ret = sb->s_op->sync_fs(sb, 1);
+ if (ret)
+ return ret;
+ }
+ return sync_blockdev(sb->s_bdev);
+}
+EXPORT_SYMBOL(sync_filesystem);
+
+static void sync_inodes_one_sb(struct super_block *sb, void *arg)
+{
+ if (!sb_rdonly(sb))
+ sync_inodes_sb(sb);
+}
+
+static void sync_fs_one_sb(struct super_block *sb, void *arg)
+{
+ if (!sb_rdonly(sb) && !(sb->s_iflags & SB_I_SKIP_SYNC) &&
+ sb->s_op->sync_fs)
+ sb->s_op->sync_fs(sb, *(int *)arg);
+}
+
+/*
+ * 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().
+ */
+void ksys_sync(void)
+{
+ int nowait = 0, wait = 1;
+
+ wakeup_flusher_threads(WB_REASON_SYNC);
+ iterate_supers(sync_inodes_one_sb, NULL);
+ iterate_supers(sync_fs_one_sb, &nowait);
+ iterate_supers(sync_fs_one_sb, &wait);
+ sync_bdevs(false);
+ sync_bdevs(true);
+ if (unlikely(laptop_mode))
+ laptop_sync_completion();
+}
+
+SYSCALL_DEFINE0(sync)
+{
+ ksys_sync();
+ return 0;
+}
+
+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);
+ sync_bdevs(false);
+ iterate_supers(sync_inodes_one_sb, &nowait);
+ iterate_supers(sync_fs_one_sb, &nowait);
+ sync_bdevs(false);
+ printk("Emergency Sync complete\n");
+ kfree(work);
+}
+
+void emergency_sync(void)
+{
+ struct work_struct *work;
+
+ work = kmalloc(sizeof(*work), GFP_ATOMIC);
+ if (work) {
+ INIT_WORK(work, do_sync_work);
+ schedule_work(work);
+ }
+}
+
+/*
+ * sync a single super
+ */
+SYSCALL_DEFINE1(syncfs, int, fd)
+{
+ struct fd f = fdget(fd);
+ struct super_block *sb;
+ int ret, ret2;
+
+ if (!f.file)
+ return -EBADF;
+ sb = f.file->f_path.dentry->d_sb;
+
+ down_read(&sb->s_umount);
+ ret = sync_filesystem(sb);
+ up_read(&sb->s_umount);
+
+ ret2 = errseq_check_and_advance(&sb->s_wb_err, &f.file->f_sb_err);
+
+ fdput(f);
+ return ret ? ret : ret2;
+}
+
+/**
+ * vfs_fsync_range - helper to sync a range of data & metadata to disk
+ * @file: file to sync
+ * @start: offset in bytes of the beginning of data range to sync
+ * @end: offset in bytes of the end of data range (inclusive)
+ * @datasync: perform only datasync
+ *
+ * Write back data in range @start..@end and metadata for @file to disk. If
+ * @datasync is set only metadata needed to access modified file data is
+ * written.
+ */
+int vfs_fsync_range(struct file *file, loff_t start, loff_t end, int datasync)
+{
+ struct inode *inode = file->f_mapping->host;
+
+ if (!file->f_op->fsync)
+ return -EINVAL;
+ if (!datasync && (inode->i_state & I_DIRTY_TIME))
+ mark_inode_dirty_sync(inode);
+ return file->f_op->fsync(file, start, end, datasync);
+}
+EXPORT_SYMBOL(vfs_fsync_range);
+
+/**
+ * vfs_fsync - perform a fsync or fdatasync on a file
+ * @file: file to sync
+ * @datasync: only perform a fdatasync operation
+ *
+ * Write back data and metadata for @file to disk. If @datasync is
+ * set only metadata needed to access modified file data is written.
+ */
+int vfs_fsync(struct file *file, int datasync)
+{
+ return vfs_fsync_range(file, 0, LLONG_MAX, datasync);
+}
+EXPORT_SYMBOL(vfs_fsync);
+
+static int do_fsync(unsigned int fd, int datasync)
+{
+ struct fd f = fdget(fd);
+ int ret = -EBADF;
+
+ if (f.file) {
+ ret = vfs_fsync(f.file, datasync);
+ fdput(f);
+ }
+ return ret;
+}
+
+SYSCALL_DEFINE1(fsync, unsigned int, fd)
+{
+ return do_fsync(fd, 0);
+}
+
+SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
+{
+ return do_fsync(fd, 1);
+}
+
+int sync_file_range(struct file *file, loff_t offset, loff_t nbytes,
+ unsigned int flags)
+{
+ int ret;
+ struct address_space *mapping;
+ loff_t endbyte; /* inclusive */
+ umode_t i_mode;
+
+ ret = -EINVAL;
+ if (flags & ~VALID_FLAGS)
+ goto out;
+
+ endbyte = offset + nbytes;
+
+ if ((s64)offset < 0)
+ goto out;
+ if ((s64)endbyte < 0)
+ goto out;
+ if (endbyte < offset)
+ goto out;
+
+ if (sizeof(pgoff_t) == 4) {
+ if (offset >= (0x100000000ULL << PAGE_SHIFT)) {
+ /*
+ * The range starts outside a 32 bit machine's
+ * pagecache addressing capabilities. Let it "succeed"
+ */
+ ret = 0;
+ goto out;
+ }
+ if (endbyte >= (0x100000000ULL << PAGE_SHIFT)) {
+ /*
+ * Out to EOF
+ */
+ nbytes = 0;
+ }
+ }
+
+ if (nbytes == 0)
+ endbyte = LLONG_MAX;
+ else
+ endbyte--; /* inclusive */
+
+ i_mode = file_inode(file)->i_mode;
+ ret = -ESPIPE;
+ if (!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISDIR(i_mode) &&
+ !S_ISLNK(i_mode))
+ goto out;
+
+ mapping = file->f_mapping;
+ ret = 0;
+ if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
+ ret = file_fdatawait_range(file, offset, endbyte);
+ if (ret < 0)
+ goto out;
+ }
+
+ if (flags & SYNC_FILE_RANGE_WRITE) {
+ int sync_mode = WB_SYNC_NONE;
+
+ if ((flags & SYNC_FILE_RANGE_WRITE_AND_WAIT) ==
+ SYNC_FILE_RANGE_WRITE_AND_WAIT)
+ sync_mode = WB_SYNC_ALL;
+
+ ret = __filemap_fdatawrite_range(mapping, offset, endbyte,
+ sync_mode);
+ if (ret < 0)
+ goto out;
+ }
+
+ if (flags & SYNC_FILE_RANGE_WAIT_AFTER)
+ ret = file_fdatawait_range(file, offset, endbyte);
+
+out:
+ return ret;
+}
+
+/*
+ * ksys_sync_file_range() permits finely controlled syncing over a segment of
+ * a file in the range offset .. (offset+nbytes-1) inclusive. If nbytes is
+ * zero then ksys_sync_file_range() will operate from offset out to EOF.
+ *
+ * The flag bits are:
+ *
+ * SYNC_FILE_RANGE_WAIT_BEFORE: wait upon writeout of all pages in the range
+ * before performing the write.
+ *
+ * SYNC_FILE_RANGE_WRITE: initiate writeout of all those dirty pages in the
+ * range which are not presently under writeback. Note that this may block for
+ * significant periods due to exhaustion of disk request structures.
+ *
+ * SYNC_FILE_RANGE_WAIT_AFTER: wait upon writeout of all pages in the range
+ * after performing the write.
+ *
+ * Useful combinations of the flag bits are:
+ *
+ * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE: ensures that all pages
+ * in the range which were dirty on entry to ksys_sync_file_range() are placed
+ * under writeout. This is a start-write-for-data-integrity operation.
+ *
+ * SYNC_FILE_RANGE_WRITE: start writeout of all dirty pages in the range which
+ * are not presently under writeout. This is an asynchronous flush-to-disk
+ * operation. Not suitable for data integrity operations.
+ *
+ * SYNC_FILE_RANGE_WAIT_BEFORE (or SYNC_FILE_RANGE_WAIT_AFTER): wait for
+ * completion of writeout of all pages in the range. This will be used after an
+ * earlier SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE operation to wait
+ * for that operation to complete and to return the result.
+ *
+ * SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE|SYNC_FILE_RANGE_WAIT_AFTER
+ * (a.k.a. SYNC_FILE_RANGE_WRITE_AND_WAIT):
+ * a traditional sync() operation. This is a write-for-data-integrity operation
+ * which will ensure that all pages in the range which were dirty on entry to
+ * ksys_sync_file_range() are written to disk. It should be noted that disk
+ * caches are not flushed by this call, so there are no guarantees here that the
+ * data will be available on disk after a crash.
+ *
+ *
+ * SYNC_FILE_RANGE_WAIT_BEFORE and SYNC_FILE_RANGE_WAIT_AFTER will detect any
+ * I/O errors or ENOSPC conditions and will return those to the caller, after
+ * clearing the EIO and ENOSPC flags in the address_space.
+ *
+ * It should be noted that none of these operations write out the file's
+ * metadata. So unless the application is strictly performing overwrites of
+ * already-instantiated disk blocks, there are no guarantees here that the data
+ * will be available after a crash.
+ */
+int ksys_sync_file_range(int fd, loff_t offset, loff_t nbytes,
+ unsigned int flags)
+{
+ int ret;
+ struct fd f;
+
+ ret = -EBADF;
+ f = fdget(fd);
+ if (f.file)
+ ret = sync_file_range(f.file, offset, nbytes, flags);
+
+ fdput(f);
+ return ret;
+}
+
+SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes,
+ unsigned int, flags)
+{
+ return ksys_sync_file_range(fd, offset, nbytes, flags);
+}
+
+#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_SYNC_FILE_RANGE)
+COMPAT_SYSCALL_DEFINE6(sync_file_range, int, fd, compat_arg_u64_dual(offset),
+ compat_arg_u64_dual(nbytes), unsigned int, flags)
+{
+ return ksys_sync_file_range(fd, compat_arg_u64_glue(offset),
+ compat_arg_u64_glue(nbytes), flags);
+}
+#endif
+
+/* It would be nice if people remember that not all the world's an i386
+ when they introduce new system calls */
+SYSCALL_DEFINE4(sync_file_range2, int, fd, unsigned int, flags,
+ loff_t, offset, loff_t, nbytes)
+{
+ return ksys_sync_file_range(fd, offset, nbytes, flags);
+}