text: /*
   *  linux/fs/ext2/file.c
   *
   * Copyright (C) 1992, 1993, 1994, 1995
   * Remy Card (card@masi.ibp.fr)
   * Laboratoire MASI - Institut Blaise Pascal
   * Universite Pierre et Marie Curie (Paris VI)
   *
   *  from
   *
   *  linux/fs/minix/file.c
   *
   *  Copyright (C) 1991, 1992  Linus Torvalds
   *
   *  ext2 fs regular file handling primitives
   *
   *  64-bit file support on 64-bit platforms by Jakub Jelinek
   * 	(jj@sunsite.ms.mff.cuni.cz)
   */
  
  #include <linux/time.h>
  #include <linux/pagemap.h>
  #include <linux/quotaops.h>
  #include "ext2.h"
  #include "xattr.h"
  #include "acl.h"
  
  /*
   * Called when filp is released. This happens when all file descriptors
   * for a single struct file are closed. Note that different open() calls
   * for the same file yield different struct file structures.
   */
  static int ext2_release_file (struct inode * inode, struct file * filp)
  {
  	if (filp->f_mode & FMODE_WRITE) {
  		mutex_lock(&EXT2_I(inode)->truncate_mutex);
  		ext2_discard_reservation(inode);
  		mutex_unlock(&EXT2_I(inode)->truncate_mutex);
  	}
  	return 0;
  }
  
  int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
  {
  	int ret;
  	struct super_block *sb = file->f_mapping->host->i_sb;
  	struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
  
  	ret = generic_file_fsync(file, start, end, datasync);
  	if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
  		/* We don't really know where the IO error happened... */
  		ext2_error(sb, __func__,
  			   "detected IO error when writing metadata buffers");
  		ret = -EIO;
  	}
  	return ret;
  }
  
  /*
   * We have mostly NULL's here: the current defaults are ok for
   * the ext2 filesystem.
   */
  const struct file_operations ext2_file_operations = {
  	.llseek		= generic_file_llseek,
  	.read		= do_sync_read,
  	.write		= do_sync_write,
  	.aio_read	= generic_file_aio_read,
  	.aio_write	= generic_file_aio_write,
  	.unlocked_ioctl = ext2_ioctl,
  #ifdef CONFIG_COMPAT
  	.compat_ioctl	= ext2_compat_ioctl,
  #endif
  	.mmap		= generic_file_mmap,
  	.open		= dquot_file_open,
  	.release	= ext2_release_file,
  	.fsync		= ext2_fsync,
  	.splice_read	= generic_file_splice_read,
  	.splice_write	= generic_file_splice_write,
  };
  
  #ifdef CONFIG_EXT2_FS_XIP
  const struct file_operations ext2_xip_file_operations = {
  	.llseek		= generic_file_llseek,
  	.read		= xip_file_read,
  	.write		= xip_file_write,
  	.unlocked_ioctl = ext2_ioctl,
  #ifdef CONFIG_COMPAT
  	.compat_ioctl	= ext2_compat_ioctl,
  #endif
  	.mmap		= xip_file_mmap,
  	.open		= dquot_file_open,
  	.release	= ext2_release_file,
  	.fsync		= ext2_fsync,
  };
  #endif
  
  const struct inode_operations ext2_file_inode_operations = {
  #ifdef CONFIG_EXT2_FS_XATTR
  	.setxattr	= generic_setxattr,
  	.getxattr	= generic_getxattr,
  	.listxattr	= ext2_listxattr,
  	.removexattr	= generic_removexattr,
  #endif
  	.setattr	= ext2_setattr,
  	.get_acl	= ext2_get_acl,
  	.set_acl	= ext2_set_acl,
  	.fiemap		= ext2_fiemap,
  };
  