Revert "fs: implement fsync_enable module"

This reverts commit 8ad5c32.

fs/sync.c

@@ -15,9 +15,6 @@
 #include <linux/buffer_head.h>
 #include "internal.h"
 
-bool fsync_enabled = false;
-module_param(fsync_enabled, bool, 0755);
-
 #define VALID_FLAGS (SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE| \
 			SYNC_FILE_RANGE_WAIT_AFTER)
 
@@ -211,9 +208,6 @@ int vfs_fsync_range(struct file *file, struct dentry *dentry, loff_t start,
 	struct address_space *mapping;
 	int err, ret;
 
-	if (!fsync_enabled)
-		return 0;
-
 	/*
 	 * Get mapping and operations from the file in case we have
 	 * as file, or get the default values for them in case we
@@ -264,9 +258,6 @@ EXPORT_SYMBOL(vfs_fsync_range);
  */
 int vfs_fsync(struct file *file, struct dentry *dentry, int datasync)
 {
-	if (!fsync_enabled)
-		return 0;
-
 	return vfs_fsync_range(file, dentry, 0, LLONG_MAX, datasync);
 }
 EXPORT_SYMBOL(vfs_fsync);
@@ -276,9 +267,6 @@ static int do_fsync(unsigned int fd, int datasync)
 	struct file *file;
 	int ret = -EBADF;
 
-	if (!fsync_enabled)
-		return 0;
-
 	file = fget(fd);
 	if (file) {
 		ret = vfs_fsync(file, file->f_path.dentry, datasync);
@@ -289,17 +277,11 @@ static int do_fsync(unsigned int fd, int datasync)
 
 SYSCALL_DEFINE1(fsync, unsigned int, fd)
 {
-	if (!fsync_enabled)
-		return 0;
-
 	return do_fsync(fd, 0);
 }
 
 SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
 {
-	if (!fsync_enabled)
-		return 0;
-
 	return do_fsync(fd, 1);
 }
 
@@ -313,9 +295,6 @@ SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
  */
 int generic_write_sync(struct file *file, loff_t pos, loff_t count)
 {
-	if (!fsync_enabled)
-			return 0;
-
 	if (!(file->f_flags & O_SYNC) && !IS_SYNC(file->f_mapping->host))
 		return 0;
 	return vfs_fsync_range(file, file->f_path.dentry, pos,
@@ -379,9 +358,6 @@ SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes,
 	int fput_needed;
 	umode_t i_mode;
 
-	if (!fsync_enabled)
-		return 0;
-
 	ret = -EINVAL;
 	if (flags & ~VALID_FLAGS)
 		goto out;