LXR linux/fs/ext2/fsync.c

   1/*
   2 *  linux/fs/ext2/fsync.c
   3 *
   4 *  Copyright (C) 1993  Stephen Tweedie (sct@dcs.ed.ac.uk)
   5 *  from
   6 *  Copyright (C) 1992  Remy Card (card@masi.ibp.fr)
   7 *                      Laboratoire MASI - Institut Blaise Pascal
   8 *                      Universite Pierre et Marie Curie (Paris VI)
   9 *  from
  10 *  linux/fs/minix/truncate.c   Copyright (C) 1991, 1992  Linus Torvalds
  11 * 
  12 *  ext2fs fsync primitive
  13 *
  14 *  Big-endian to little-endian byte-swapping/bitmaps by
  15 *        David S. Miller (davem@caip.rutgers.edu), 1995
  16 * 
  17 *  Removed unnecessary code duplication for little endian machines
  18 *  and excessive __inline__s. 
  19 *        Andi Kleen, 1997
  20 *
  21 * Major simplications and cleanup - we only need to do the metadata, because
  22 * we can depend on generic_block_fdatasync() to sync the data blocks.
  23 */
  24
  25#include "ext2.h"
  26#include <linux/buffer_head.h>          /* for sync_mapping_buffers() */
  27
  28
  29/*
  30 *      File may be NULL when we are called. Perhaps we shouldn't
  31 *      even pass file to fsync ?
  32 */
  33
  34int ext2_sync_file(struct file *file, struct dentry *dentry, int datasync)
  35{
  36        struct inode *inode = dentry->d_inode;
  37        int err;
  38        int ret;
  39
  40        ret = sync_mapping_buffers(inode->i_mapping);
  41        if (!(inode->i_state & I_DIRTY))
  42                return ret;
  43        if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
  44                return ret;
  45
  46        err = ext2_sync_inode(inode);
  47        if (ret == 0)
  48                ret = err;
  49        return ret;
  50}
  51