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/smp_lock.h>
  27 #include <linux/buffer_head.h>          /* for sync_mapping_buffers() */
  28
  29
  30 /*
  31  *      File may be NULL when we are called. Perhaps we shouldn't
  32  *      even pass file to fsync ?
  33  */
  34
  35 int ext2_sync_file(struct file *file, struct dentry *dentry, int datasync)
  36 {
  37         struct inode *inode = dentry->d_inode;
  38         int err;
  39         int ret;
  40
  41         ret = sync_mapping_buffers(inode->i_mapping);
  42         if (!(inode->i_state & I_DIRTY))
  43                 return ret;
  44         if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
  45                 return ret;
  46
  47         err = ext2_sync_inode(inode);
  48         if (ret == 0)
  49                 ret = err;
  50         return ret;
  51 }