fs/xfs/linux-2.6/xfs_file.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
  * All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it would be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write the Free Software Foundation,
  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 #include "xfs.h"
 #include "xfs_bit.h"
 #include "xfs_log.h"
 #include "xfs_inum.h"
 #include "xfs_sb.h"
 #include "xfs_ag.h"
 #include "xfs_dir2.h"
 #include "xfs_trans.h"
 #include "xfs_dmapi.h"
 #include "xfs_mount.h"
 #include "xfs_bmap_btree.h"
 #include "xfs_alloc_btree.h"
 #include "xfs_ialloc_btree.h"
 #include "xfs_alloc.h"
 #include "xfs_btree.h"
 #include "xfs_attr_sf.h"
 #include "xfs_dir2_sf.h"
 #include "xfs_dinode.h"
 #include "xfs_inode.h"
 #include "xfs_error.h"
 #include "xfs_rw.h"
 #include "xfs_ioctl32.h"
 #include "xfs_vnodeops.h"

 #include <linux/dcache.h>
 #include <linux/smp_lock.h>

 static struct vm_operations_struct xfs_file_vm_ops;

 STATIC_INLINE ssize_t
 __xfs_file_read(
 	struct kiocb		*iocb,
 	const struct iovec	*iov,
 	unsigned long		nr_segs,
 	int			ioflags,
 	loff_t			pos)
 {
 	struct file		*file = iocb->ki_filp;

 	BUG_ON(iocb->ki_pos != pos);
 	if (unlikely(file->f_flags & O_DIRECT))
 		ioflags |= IO_ISDIRECT;
 	return xfs_read(XFS_I(file->f_path.dentry->d_inode), iocb, iov,
 				nr_segs, &iocb->ki_pos, ioflags);
 }

 STATIC ssize_t
 xfs_file_aio_read(
 	struct kiocb		*iocb,
 	const struct iovec	*iov,
 	unsigned long		nr_segs,
 	loff_t			pos)
 {
 	return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO, pos);
 }

 STATIC ssize_t
 xfs_file_aio_read_invis(
 	struct kiocb		*iocb,
 	const struct iovec	*iov,
 	unsigned long		nr_segs,
 	loff_t			pos)
 {
 	return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO|IO_INVIS, pos);
 }

 STATIC_INLINE ssize_t
 __xfs_file_write(
 	struct kiocb		*iocb,
 	const struct iovec	*iov,
 	unsigned long		nr_segs,
 	int			ioflags,
 	loff_t			pos)
 {
 	struct file	*file = iocb->ki_filp;

 	BUG_ON(iocb->ki_pos != pos);
 	if (unlikely(file->f_flags & O_DIRECT))
 		ioflags |= IO_ISDIRECT;
 	return xfs_write(XFS_I(file->f_mapping->host), iocb, iov, nr_segs,
 				&iocb->ki_pos, ioflags);
 }

 STATIC ssize_t
 xfs_file_aio_write(
 	struct kiocb		*iocb,
 	const struct iovec	*iov,
 	unsigned long		nr_segs,
 	loff_t			pos)
 {
 	return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO, pos);
 }

 STATIC ssize_t
 xfs_file_aio_write_invis(
 	struct kiocb		*iocb,
 	const struct iovec	*iov,
 	unsigned long		nr_segs,
 	loff_t			pos)
 {
 	return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO|IO_INVIS, pos);
 }

 STATIC ssize_t
 xfs_file_splice_read(
 	struct file		*infilp,
 	loff_t			*ppos,
 	struct pipe_inode_info	*pipe,
 	size_t			len,
 	unsigned int		flags)
 {
 	return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
 				   infilp, ppos, pipe, len, flags, 0);
 }

 STATIC ssize_t
 xfs_file_splice_read_invis(
 	struct file		*infilp,
 	loff_t			*ppos,
 	struct pipe_inode_info	*pipe,
 	size_t			len,
 	unsigned int		flags)
 {
 	return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
 				   infilp, ppos, pipe, len, flags, IO_INVIS);
 }

 STATIC ssize_t
 xfs_file_splice_write(
 	struct pipe_inode_info	*pipe,
 	struct file		*outfilp,
 	loff_t			*ppos,
 	size_t			len,
 	unsigned int		flags)
 {
 	return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
 				    pipe, outfilp, ppos, len, flags, 0);
 }

 STATIC ssize_t
 xfs_file_splice_write_invis(
 	struct pipe_inode_info	*pipe,
 	struct file		*outfilp,
 	loff_t			*ppos,
 	size_t			len,
 	unsigned int		flags)
 {
 	return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
 				    pipe, outfilp, ppos, len, flags, IO_INVIS);
 }

 STATIC int
 xfs_file_open(
 	struct inode	*inode,
 	struct file	*filp)
 {
 	if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
 		return -EFBIG;
 	return -xfs_open(XFS_I(inode));
 }

 STATIC int
 xfs_file_release(
 	struct inode	*inode,
 	struct file	*filp)
 {
 	return -xfs_release(XFS_I(inode));
 }

 STATIC int
 xfs_file_fsync(
 	struct file	*filp,
 	struct dentry	*dentry,
 	int		datasync)
 {
 	int		flags = FSYNC_WAIT;

 	if (datasync)
 		flags |= FSYNC_DATA;
 	xfs_iflags_clear(XFS_I(dentry->d_inode), XFS_ITRUNCATED);
 	return -xfs_fsync(XFS_I(dentry->d_inode), flags,
 			(xfs_off_t)0, (xfs_off_t)-1);
 }

 /*
  * Unfortunately we can't just use the clean and simple readdir implementation
  * below, because nfs might call back into ->lookup from the filldir callback
  * and that will deadlock the low-level btree code.
  *
  * Hopefully we'll find a better workaround that allows to use the optimal
  * version at least for local readdirs for 2.6.25.
  */
 #if 0
 STATIC int
 xfs_file_readdir(
 	struct file	*filp,
 	void		*dirent,
 	filldir_t	filldir)
 {
 	struct inode	*inode = filp->f_path.dentry->d_inode;
 	xfs_inode_t	*ip = XFS_I(inode);
 	int		error;
 	size_t		bufsize;

 	/*
 	 * The Linux API doesn't pass down the total size of the buffer
 	 * we read into down to the filesystem.  With the filldir concept
 	 * it's not needed for correct information, but the XFS dir2 leaf
 	 * code wants an estimate of the buffer size to calculate it's
 	 * readahead window and size the buffers used for mapping to
 	 * physical blocks.
 	 *
 	 * Try to give it an estimate that's good enough, maybe at some
 	 * point we can change the ->readdir prototype to include the
 	 * buffer size.
 	 */
 	bufsize = (size_t)min_t(loff_t, PAGE_SIZE, inode->i_size);

 	error = xfs_readdir(ip, dirent, bufsize,
 				(xfs_off_t *)&filp->f_pos, filldir);
 	if (error)
 		return -error;
 	return 0;
 }
 #else

 struct hack_dirent {
 	u64		ino;
 	loff_t		offset;
 	int		namlen;
 	unsigned int	d_type;
 	char		name[];
 };

 struct hack_callback {
 	char		*dirent;
 	size_t		len;
 	size_t		used;
 };

 STATIC int
 xfs_hack_filldir(
 	void		*__buf,
 	const char	*name,
 	int		namlen,
 	loff_t		offset,
 	u64		ino,
 	unsigned int	d_type)
 {
 	struct hack_callback *buf = __buf;
 	struct hack_dirent *de = (struct hack_dirent *)(buf->dirent + buf->used);
 	unsigned int reclen;

 	reclen = ALIGN(sizeof(struct hack_dirent) + namlen, sizeof(u64));
 	if (buf->used + reclen > buf->len)
 		return -EINVAL;

 	de->namlen = namlen;
 	de->offset = offset;
 	de->ino = ino;
 	de->d_type = d_type;
 	memcpy(de->name, name, namlen);
 	buf->used += reclen;
 	return 0;
 }

 STATIC int
 xfs_file_readdir(
 	struct file	*filp,
 	void		*dirent,
 	filldir_t	filldir)
 {
 	struct inode	*inode = filp->f_path.dentry->d_inode;
 	xfs_inode_t	*ip = XFS_I(inode);
 	struct hack_callback buf;
 	struct hack_dirent *de;
 	int		error;
 	loff_t		size;
 	int		eof = 0;
 	xfs_off_t       start_offset, curr_offset, offset;

 	/*
 	 * Try fairly hard to get memory
 	 */
 	buf.len = PAGE_CACHE_SIZE;
 	do {
 		buf.dirent = kmalloc(buf.len, GFP_KERNEL);
 		if (buf.dirent)
 			break;
 		buf.len >>= 1;
 	} while (buf.len >= 1024);

 	if (!buf.dirent)
 		return -ENOMEM;

 	curr_offset = filp->f_pos;
 	if (curr_offset == 0x7fffffff)
 		offset = 0xffffffff;
 	else
 		offset = filp->f_pos;

 	while (!eof) {
 		unsigned int reclen;

 		start_offset = offset;

 		buf.used = 0;
 		error = -xfs_readdir(ip, &buf, buf.len, &offset,
 				     xfs_hack_filldir);
 		if (error || offset == start_offset) {
 			size = 0;
 			break;
 		}

 		size = buf.used;
 		de = (struct hack_dirent *)buf.dirent;
 		while (size > 0) {
 			curr_offset = de->offset /* & 0x7fffffff */;
 			if (filldir(dirent, de->name, de->namlen,
 					curr_offset & 0x7fffffff,
 					de->ino, de->d_type)) {
 				goto done;
 			}

 			reclen = ALIGN(sizeof(struct hack_dirent) + de->namlen,
 				       sizeof(u64));
 			size -= reclen;
 			de = (struct hack_dirent *)((char *)de + reclen);
 		}
 	}

  done:
 	if (!error) {
 		if (size == 0)
 			filp->f_pos = offset & 0x7fffffff;
 		else if (de)
 			filp->f_pos = curr_offset;
 	}

 	kfree(buf.dirent);
 	return error;
 }
 #endif

 STATIC int
 xfs_file_mmap(
 	struct file	*filp,
 	struct vm_area_struct *vma)
 {
 	vma->vm_ops = &xfs_file_vm_ops;
 	vma->vm_flags |= VM_CAN_NONLINEAR;

 	file_accessed(filp);
 	return 0;
 }

 STATIC long
 xfs_file_ioctl(
 	struct file	*filp,
 	unsigned int	cmd,
 	unsigned long	p)
 {
 	int		error;
 	struct inode	*inode = filp->f_path.dentry->d_inode;

 	error = xfs_ioctl(XFS_I(inode), filp, 0, cmd, (void __user *)p);
 	xfs_iflags_set(XFS_I(inode), XFS_IMODIFIED);

 	/* NOTE:  some of the ioctl's return positive #'s as a
 	 *	  byte count indicating success, such as
 	 *	  readlink_by_handle.  So we don't "sign flip"
 	 *	  like most other routines.  This means true
 	 *	  errors need to be returned as a negative value.
 	 */
 	return error;
 }

 STATIC long
 xfs_file_ioctl_invis(
 	struct file	*filp,
 	unsigned int	cmd,
 	unsigned long	p)
 {
 	int		error;
 	struct inode	*inode = filp->f_path.dentry->d_inode;

 	error = xfs_ioctl(XFS_I(inode), filp, IO_INVIS, cmd, (void __user *)p);
 	xfs_iflags_set(XFS_I(inode), XFS_IMODIFIED);

 	/* NOTE:  some of the ioctl's return positive #'s as a
 	 *	  byte count indicating success, such as
 	 *	  readlink_by_handle.  So we don't "sign flip"
 	 *	  like most other routines.  This means true
 	 *	  errors need to be returned as a negative value.
 	 */
 	return error;
 }

 /*
  * mmap()d file has taken write protection fault and is being made
  * writable. We can set the page state up correctly for a writable
  * page, which means we can do correct delalloc accounting (ENOSPC
  * checking!) and unwritten extent mapping.
  */
 STATIC int
 xfs_vm_page_mkwrite(
 	struct vm_area_struct	*vma,
 	struct page		*page)
 {
 	return block_page_mkwrite(vma, page, xfs_get_blocks);
 }

 const struct file_operations xfs_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= do_sync_read,
 	.write		= do_sync_write,
 	.aio_read	= xfs_file_aio_read,
 	.aio_write	= xfs_file_aio_write,
 	.splice_read	= xfs_file_splice_read,
 	.splice_write	= xfs_file_splice_write,
 	.unlocked_ioctl	= xfs_file_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= xfs_file_compat_ioctl,
 #endif
 	.mmap		= xfs_file_mmap,
 	.open		= xfs_file_open,
 	.release	= xfs_file_release,
 	.fsync		= xfs_file_fsync,
 #ifdef HAVE_FOP_OPEN_EXEC
 	.open_exec	= xfs_file_open_exec,
 #endif
 };

 const struct file_operations xfs_invis_file_operations = {
 	.llseek		= generic_file_llseek,
 	.read		= do_sync_read,
 	.write		= do_sync_write,
 	.aio_read	= xfs_file_aio_read_invis,
 	.aio_write	= xfs_file_aio_write_invis,
 	.splice_read	= xfs_file_splice_read_invis,
 	.splice_write	= xfs_file_splice_write_invis,
 	.unlocked_ioctl	= xfs_file_ioctl_invis,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= xfs_file_compat_invis_ioctl,
 #endif
 	.mmap		= xfs_file_mmap,
 	.open		= xfs_file_open,
 	.release	= xfs_file_release,
 	.fsync		= xfs_file_fsync,
 };


 const struct file_operations xfs_dir_file_operations = {
 	.read		= generic_read_dir,
 	.readdir	= xfs_file_readdir,
 	.unlocked_ioctl	= xfs_file_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= xfs_file_compat_ioctl,
 #endif
 	.fsync		= xfs_file_fsync,
 };

 static struct vm_operations_struct xfs_file_vm_ops = {
 	.fault		= filemap_fault,
 	.page_mkwrite	= xfs_vm_page_mkwrite,
 };
	/*
	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
	* All Rights Reserved.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it would be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/
	#include "xfs.h"
	#include "xfs_bit.h"
	#include "xfs_log.h"
	#include "xfs_inum.h"
	#include "xfs_sb.h"
	#include "xfs_ag.h"
	#include "xfs_dir2.h"
	#include "xfs_trans.h"
	#include "xfs_dmapi.h"
	#include "xfs_mount.h"
	#include "xfs_bmap_btree.h"
	#include "xfs_alloc_btree.h"
	#include "xfs_ialloc_btree.h"
	#include "xfs_alloc.h"
	#include "xfs_btree.h"
	#include "xfs_attr_sf.h"
	#include "xfs_dir2_sf.h"
	#include "xfs_dinode.h"
	#include "xfs_inode.h"
	#include "xfs_error.h"
	#include "xfs_rw.h"
	#include "xfs_ioctl32.h"
	#include "xfs_vnodeops.h"

	#include <linux/dcache.h>
	#include <linux/smp_lock.h>

	static struct vm_operations_struct xfs_file_vm_ops;

	STATIC_INLINE ssize_t
	__xfs_file_read(
	struct kiocb *iocb,
	const struct iovec *iov,
	unsigned long nr_segs,
	int ioflags,
	loff_t pos)
	{
	struct file *file = iocb->ki_filp;

	BUG_ON(iocb->ki_pos != pos);
	if (unlikely(file->f_flags & O_DIRECT))
	ioflags \|= IO_ISDIRECT;
	return xfs_read(XFS_I(file->f_path.dentry->d_inode), iocb, iov,
	nr_segs, &iocb->ki_pos, ioflags);
	}

	STATIC ssize_t
	xfs_file_aio_read(
	struct kiocb *iocb,
	const struct iovec *iov,
	unsigned long nr_segs,
	loff_t pos)
	{
	return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO, pos);
	}

	STATIC ssize_t
	xfs_file_aio_read_invis(
	struct kiocb *iocb,
	const struct iovec *iov,
	unsigned long nr_segs,
	loff_t pos)
	{
	return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO\|IO_INVIS, pos);
	}

	STATIC_INLINE ssize_t
	__xfs_file_write(
	struct kiocb *iocb,
	const struct iovec *iov,
	unsigned long nr_segs,
	int ioflags,
	loff_t pos)
	{
	struct file *file = iocb->ki_filp;

	BUG_ON(iocb->ki_pos != pos);
	if (unlikely(file->f_flags & O_DIRECT))
	ioflags \|= IO_ISDIRECT;
	return xfs_write(XFS_I(file->f_mapping->host), iocb, iov, nr_segs,
	&iocb->ki_pos, ioflags);
	}

	STATIC ssize_t
	xfs_file_aio_write(
	struct kiocb *iocb,
	const struct iovec *iov,
	unsigned long nr_segs,
	loff_t pos)
	{
	return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO, pos);
	}

	STATIC ssize_t
	xfs_file_aio_write_invis(
	struct kiocb *iocb,
	const struct iovec *iov,
	unsigned long nr_segs,
	loff_t pos)
	{
	return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO\|IO_INVIS, pos);
	}

	STATIC ssize_t
	xfs_file_splice_read(
	struct file *infilp,
	loff_t *ppos,
	struct pipe_inode_info *pipe,
	size_t len,
	unsigned int flags)
	{
	return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
	infilp, ppos, pipe, len, flags, 0);
	}

	STATIC ssize_t
	xfs_file_splice_read_invis(
	struct file *infilp,
	loff_t *ppos,
	struct pipe_inode_info *pipe,
	size_t len,
	unsigned int flags)
	{
	return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
	infilp, ppos, pipe, len, flags, IO_INVIS);
	}

	STATIC ssize_t
	xfs_file_splice_write(
	struct pipe_inode_info *pipe,
	struct file *outfilp,
	loff_t *ppos,
	size_t len,
	unsigned int flags)
	{
	return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
	pipe, outfilp, ppos, len, flags, 0);
	}

	STATIC ssize_t
	xfs_file_splice_write_invis(
	struct pipe_inode_info *pipe,
	struct file *outfilp,
	loff_t *ppos,
	size_t len,
	unsigned int flags)
	{
	return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
	pipe, outfilp, ppos, len, flags, IO_INVIS);
	}

	STATIC int
	xfs_file_open(
	struct inode *inode,
	struct file *filp)
	{
	if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
	return -EFBIG;
	return -xfs_open(XFS_I(inode));
	}

	STATIC int
	xfs_file_release(
	struct inode *inode,
	struct file *filp)
	{
	return -xfs_release(XFS_I(inode));
	}

	STATIC int
	xfs_file_fsync(
	struct file *filp,
	struct dentry *dentry,
	int datasync)
	{
	int flags = FSYNC_WAIT;

	if (datasync)
	flags \|= FSYNC_DATA;
	xfs_iflags_clear(XFS_I(dentry->d_inode), XFS_ITRUNCATED);
	return -xfs_fsync(XFS_I(dentry->d_inode), flags,
	(xfs_off_t)0, (xfs_off_t)-1);
	}

	/*
	* Unfortunately we can't just use the clean and simple readdir implementation
	* below, because nfs might call back into ->lookup from the filldir callback
	* and that will deadlock the low-level btree code.
	*
	* Hopefully we'll find a better workaround that allows to use the optimal
	* version at least for local readdirs for 2.6.25.
	*/
	#if 0
	STATIC int
	xfs_file_readdir(
	struct file *filp,
	void *dirent,
	filldir_t filldir)
	{
	struct inode *inode = filp->f_path.dentry->d_inode;
	xfs_inode_t *ip = XFS_I(inode);
	int error;
	size_t bufsize;

	/*
	* The Linux API doesn't pass down the total size of the buffer
	* we read into down to the filesystem. With the filldir concept
	* it's not needed for correct information, but the XFS dir2 leaf
	* code wants an estimate of the buffer size to calculate it's
	* readahead window and size the buffers used for mapping to
	* physical blocks.
	*
	* Try to give it an estimate that's good enough, maybe at some
	* point we can change the ->readdir prototype to include the
	* buffer size.
	*/
	bufsize = (size_t)min_t(loff_t, PAGE_SIZE, inode->i_size);

	error = xfs_readdir(ip, dirent, bufsize,
	(xfs_off_t *)&filp->f_pos, filldir);
	if (error)
	return -error;
	return 0;
	}
	#else

	struct hack_dirent {
	u64 ino;
	loff_t offset;
	int namlen;
	unsigned int d_type;
	char name[];
	};

	struct hack_callback {
	char *dirent;
	size_t len;
	size_t used;
	};

	STATIC int
	xfs_hack_filldir(
	void *__buf,
	const char *name,
	int namlen,
	loff_t offset,
	u64 ino,
	unsigned int d_type)
	{
	struct hack_callback *buf = __buf;
	struct hack_dirent de = (struct hack_dirent )(buf->dirent + buf->used);
	unsigned int reclen;

	reclen = ALIGN(sizeof(struct hack_dirent) + namlen, sizeof(u64));
	if (buf->used + reclen > buf->len)
	return -EINVAL;

	de->namlen = namlen;
	de->offset = offset;
	de->ino = ino;
	de->d_type = d_type;
	memcpy(de->name, name, namlen);
	buf->used += reclen;
	return 0;
	}

	STATIC int
	xfs_file_readdir(
	struct file *filp,
	void *dirent,
	filldir_t filldir)
	{
	struct inode *inode = filp->f_path.dentry->d_inode;
	xfs_inode_t *ip = XFS_I(inode);
	struct hack_callback buf;
	struct hack_dirent *de;
	int error;
	loff_t size;
	int eof = 0;
	xfs_off_t start_offset, curr_offset, offset;

	/*
	* Try fairly hard to get memory
	*/
	buf.len = PAGE_CACHE_SIZE;
	do {
	buf.dirent = kmalloc(buf.len, GFP_KERNEL);
	if (buf.dirent)
	break;
	buf.len >>= 1;
	} while (buf.len >= 1024);

	if (!buf.dirent)
	return -ENOMEM;

	curr_offset = filp->f_pos;
	if (curr_offset == 0x7fffffff)
	offset = 0xffffffff;
	else
	offset = filp->f_pos;

	while (!eof) {
	unsigned int reclen;

	start_offset = offset;

	buf.used = 0;
	error = -xfs_readdir(ip, &buf, buf.len, &offset,
	xfs_hack_filldir);
	if (error \|\| offset == start_offset) {
	size = 0;
	break;
	}

	size = buf.used;
	de = (struct hack_dirent *)buf.dirent;
	while (size > 0) {
	curr_offset = de->offset /* & 0x7fffffff */;
	if (filldir(dirent, de->name, de->namlen,
	curr_offset & 0x7fffffff,
	de->ino, de->d_type)) {
	goto done;
	}

	reclen = ALIGN(sizeof(struct hack_dirent) + de->namlen,
	sizeof(u64));
	size -= reclen;
	de = (struct hack_dirent )((char )de + reclen);
	}
	}

	done:
	if (!error) {
	if (size == 0)
	filp->f_pos = offset & 0x7fffffff;
	else if (de)
	filp->f_pos = curr_offset;
	}

	kfree(buf.dirent);
	return error;
	}
	#endif

	STATIC int
	xfs_file_mmap(
	struct file *filp,
	struct vm_area_struct *vma)
	{
	vma->vm_ops = &xfs_file_vm_ops;
	vma->vm_flags \|= VM_CAN_NONLINEAR;

	file_accessed(filp);
	return 0;
	}

	STATIC long
	xfs_file_ioctl(
	struct file *filp,
	unsigned int cmd,
	unsigned long p)
	{
	int error;
	struct inode *inode = filp->f_path.dentry->d_inode;

	error = xfs_ioctl(XFS_I(inode), filp, 0, cmd, (void __user *)p);
	xfs_iflags_set(XFS_I(inode), XFS_IMODIFIED);

	/* NOTE: some of the ioctl's return positive #'s as a
	* byte count indicating success, such as
	* readlink_by_handle. So we don't "sign flip"
	* like most other routines. This means true
	* errors need to be returned as a negative value.
	*/
	return error;
	}

	STATIC long
	xfs_file_ioctl_invis(
	struct file *filp,
	unsigned int cmd,
	unsigned long p)
	{
	int error;
	struct inode *inode = filp->f_path.dentry->d_inode;

	error = xfs_ioctl(XFS_I(inode), filp, IO_INVIS, cmd, (void __user *)p);
	xfs_iflags_set(XFS_I(inode), XFS_IMODIFIED);

	/* NOTE: some of the ioctl's return positive #'s as a
	* byte count indicating success, such as
	* readlink_by_handle. So we don't "sign flip"
	* like most other routines. This means true
	* errors need to be returned as a negative value.
	*/
	return error;
	}

	/*
	* mmap()d file has taken write protection fault and is being made
	* writable. We can set the page state up correctly for a writable
	* page, which means we can do correct delalloc accounting (ENOSPC
	* checking!) and unwritten extent mapping.
	*/
	STATIC int
	xfs_vm_page_mkwrite(
	struct vm_area_struct *vma,
	struct page *page)
	{
	return block_page_mkwrite(vma, page, xfs_get_blocks);
	}

	const struct file_operations xfs_file_operations = {
	.llseek = generic_file_llseek,
	.read = do_sync_read,
	.write = do_sync_write,
	.aio_read = xfs_file_aio_read,
	.aio_write = xfs_file_aio_write,
	.splice_read = xfs_file_splice_read,
	.splice_write = xfs_file_splice_write,
	.unlocked_ioctl = xfs_file_ioctl,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = xfs_file_compat_ioctl,
	#endif
	.mmap = xfs_file_mmap,
	.open = xfs_file_open,
	.release = xfs_file_release,
	.fsync = xfs_file_fsync,
	#ifdef HAVE_FOP_OPEN_EXEC
	.open_exec = xfs_file_open_exec,
	#endif
	};

	const struct file_operations xfs_invis_file_operations = {
	.llseek = generic_file_llseek,
	.read = do_sync_read,
	.write = do_sync_write,
	.aio_read = xfs_file_aio_read_invis,
	.aio_write = xfs_file_aio_write_invis,
	.splice_read = xfs_file_splice_read_invis,
	.splice_write = xfs_file_splice_write_invis,
	.unlocked_ioctl = xfs_file_ioctl_invis,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = xfs_file_compat_invis_ioctl,
	#endif
	.mmap = xfs_file_mmap,
	.open = xfs_file_open,
	.release = xfs_file_release,
	.fsync = xfs_file_fsync,
	};


	const struct file_operations xfs_dir_file_operations = {
	.read = generic_read_dir,
	.readdir = xfs_file_readdir,
	.unlocked_ioctl = xfs_file_ioctl,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = xfs_file_compat_ioctl,
	#endif
	.fsync = xfs_file_fsync,
	};

	static struct vm_operations_struct xfs_file_vm_ops = {
	.fault = filemap_fault,
	.page_mkwrite = xfs_vm_page_mkwrite,
	};