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Implement ->page_mkwrite in XFS.

Hook XFS up to ->page_mkwrite to ensure that we know about
mmap pages being written to. This allows use to do correct
delayed allocation and ENOSPC checking as well as remap unwritten
extents so that they get converted correctly during writeback.
This is done via the generic block_page_mkwrite code.
Merge of xfs-linux-melb:xfs-kern:29149a by kenmcd.

  Connect ->page_mkwrite to the generic block_page_mkwrite
  implementation.

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

static struct vm_operations_struct xfs_file_vm_ops;
#ifdef HAVE_DMAPI
static struct vm_operations_struct xfs_dmapi_file_vm_ops;
#endif

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;
	bhv_vnode_t		*vp = vn_from_inode(file->f_path.dentry->d_inode);

	BUG_ON(iocb->ki_pos != pos);
	if (unlikely(file->f_flags & O_DIRECT))
		ioflags |= IO_ISDIRECT;
	return bhv_vop_read(vp, iocb, iov, nr_segs, &iocb->ki_pos,
				ioflags, NULL);
}

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;
	struct inode	*inode = file->f_mapping->host;
	bhv_vnode_t	*vp = vn_from_inode(inode);

	BUG_ON(iocb->ki_pos != pos);
	if (unlikely(file->f_flags & O_DIRECT))
		ioflags |= IO_ISDIRECT;
	return bhv_vop_write(vp, iocb, iov, nr_segs, &iocb->ki_pos,
				ioflags, NULL);
}

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_sendfile(
	struct file		*filp,
	loff_t			*pos,
	size_t			count,
	read_actor_t		actor,
	void			*target)
{
	return bhv_vop_sendfile(vn_from_inode(filp->f_path.dentry->d_inode),
				filp, pos, 0, count, actor, target, NULL);
}

STATIC ssize_t
xfs_file_sendfile_invis(
	struct file		*filp,
	loff_t			*pos,
	size_t			count,
	read_actor_t		actor,
	void			*target)
{
	return bhv_vop_sendfile(vn_from_inode(filp->f_path.dentry->d_inode),
				filp, pos, IO_INVIS, count, actor, target, NULL);
}

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 bhv_vop_splice_read(vn_from_inode(infilp->f_path.dentry->d_inode),
				   infilp, ppos, pipe, len, flags, 0, NULL);
}

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 bhv_vop_splice_read(vn_from_inode(infilp->f_path.dentry->d_inode),
				   infilp, ppos, pipe, len, flags, IO_INVIS,
				   NULL);
}

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 bhv_vop_splice_write(vn_from_inode(outfilp->f_path.dentry->d_inode),
				    pipe, outfilp, ppos, len, flags, 0, NULL);
}

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 bhv_vop_splice_write(vn_from_inode(outfilp->f_path.dentry->d_inode),
				    pipe, outfilp, ppos, len, flags, IO_INVIS,
				    NULL);
}

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 -bhv_vop_open(vn_from_inode(inode), NULL);
}

STATIC int
xfs_file_release(
	struct inode	*inode,
	struct file	*filp)
{
	bhv_vnode_t	*vp = vn_from_inode(inode);

	if (vp)
		return -bhv_vop_release(vp);
	return 0;
}

STATIC int
xfs_file_fsync(
	struct file	*filp,
	struct dentry	*dentry,
	int		datasync)
{
	bhv_vnode_t	*vp = vn_from_inode(dentry->d_inode);
	int		flags = FSYNC_WAIT;

	if (datasync)
		flags |= FSYNC_DATA;
	if (VN_TRUNC(vp))
		VUNTRUNCATE(vp);
	return -bhv_vop_fsync(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1);
}

#ifdef HAVE_DMAPI
STATIC struct page *
xfs_vm_nopage(
	struct vm_area_struct	*area,
	unsigned long		address,
	int			*type)
{
	struct inode	*inode = area->vm_file->f_path.dentry->d_inode;
	bhv_vnode_t	*vp = vn_from_inode(inode);

	ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI);
	if (XFS_SEND_MMAP(XFS_VFSTOM(vp->v_vfsp), area, 0))
		return NULL;
	return filemap_nopage(area, address, type);
}
#endif /* HAVE_DMAPI */

STATIC int
xfs_file_readdir(
	struct file	*filp,
	void		*dirent,
	filldir_t	filldir)
{
	int		error = 0;
	bhv_vnode_t	*vp = vn_from_inode(filp->f_path.dentry->d_inode);
	uio_t		uio;
	iovec_t		iov;
	int		eof = 0;
	caddr_t		read_buf;
	int		namelen, size = 0;
	size_t		rlen = PAGE_CACHE_SIZE;
	xfs_off_t	start_offset, curr_offset;
	xfs_dirent_t	*dbp = NULL;

	/* Try fairly hard to get memory */
	do {
		if ((read_buf = kmalloc(rlen, GFP_KERNEL)))
			break;
		rlen >>= 1;
	} while (rlen >= 1024);

	if (read_buf == NULL)
		return -ENOMEM;

	uio.uio_iov = &iov;
	uio.uio_segflg = UIO_SYSSPACE;
	curr_offset = filp->f_pos;
	if (filp->f_pos != 0x7fffffff)
		uio.uio_offset = filp->f_pos;
	else
		uio.uio_offset = 0xffffffff;

	while (!eof) {
		uio.uio_resid = iov.iov_len = rlen;
		iov.iov_base = read_buf;
		uio.uio_iovcnt = 1;

		start_offset = uio.uio_offset;

		error = bhv_vop_readdir(vp, &uio, NULL, &eof);
		if ((uio.uio_offset == start_offset) || error) {
			size = 0;
			break;
		}

		size = rlen - uio.uio_resid;
		dbp = (xfs_dirent_t *)read_buf;
		while (size > 0) {
			namelen = strlen(dbp->d_name);

			if (filldir(dirent, dbp->d_name, namelen,
					(loff_t) curr_offset & 0x7fffffff,
					(ino_t) dbp->d_ino,
					DT_UNKNOWN)) {
				goto done;
			}
			size -= dbp->d_reclen;
			curr_offset = (loff_t)dbp->d_off /* & 0x7fffffff */;
			dbp = (xfs_dirent_t *)((char *)dbp + dbp->d_reclen);
		}
	}
done:
	if (!error) {
		if (size == 0)
			filp->f_pos = uio.uio_offset & 0x7fffffff;
		else if (dbp)
			filp->f_pos = curr_offset;
	}

	kfree(read_buf);
	return -error;
}

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

#ifdef HAVE_DMAPI
	if (vn_from_inode(filp->f_path.dentry->d_inode)->v_vfsp->vfs_flag & VFS_DMI)
		vma->vm_ops = &xfs_dmapi_file_vm_ops;
#endif /* HAVE_DMAPI */

	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;
	bhv_vnode_t	*vp = vn_from_inode(inode);

	error = bhv_vop_ioctl(vp, inode, filp, 0, cmd, (void __user *)p);
	VMODIFY(vp);

	/* 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;
	bhv_vnode_t	*vp = vn_from_inode(inode);

	error = bhv_vop_ioctl(vp, inode, filp, IO_INVIS, cmd, (void __user *)p);
	VMODIFY(vp);

	/* 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;
}

#ifdef HAVE_DMAPI
#ifdef HAVE_VMOP_MPROTECT
STATIC int
xfs_vm_mprotect(
	struct vm_area_struct *vma,
	unsigned int	newflags)
{
	bhv_vnode_t	*vp = vn_from_inode(vma->vm_file->f_path.dentry->d_inode);
	int		error = 0;

	if (vp->v_vfsp->vfs_flag & VFS_DMI) {
		if ((vma->vm_flags & VM_MAYSHARE) &&
		    (newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE)) {
			xfs_mount_t	*mp = XFS_VFSTOM(vp->v_vfsp);

			error = XFS_SEND_MMAP(mp, vma, VM_WRITE);
		    }
	}
	return error;
}
#endif /* HAVE_VMOP_MPROTECT */
#endif /* HAVE_DMAPI */

#ifdef HAVE_FOP_OPEN_EXEC
/* If the user is attempting to execute a file that is offline then
 * we have to trigger a DMAPI READ event before the file is marked as busy
 * otherwise the invisible I/O will not be able to write to the file to bring
 * it back online.
 */
STATIC int
xfs_file_open_exec(
	struct inode	*inode)
{
	bhv_vnode_t	*vp = vn_from_inode(inode);

	if (unlikely(vp->v_vfsp->vfs_flag & VFS_DMI)) {
		xfs_mount_t	*mp = XFS_VFSTOM(vp->v_vfsp);
		xfs_inode_t	*ip = xfs_vtoi(vp);

		if (!ip)
			return -EINVAL;
		if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ))
			return -XFS_SEND_DATA(mp, DM_EVENT_READ, vp,
					       0, 0, 0, NULL);
	}
	return 0;
}
#endif /* HAVE_FOP_OPEN_EXEC */

/*
 * 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,
	.sendfile	= xfs_file_sendfile,
	.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,
	.sendfile	= xfs_file_sendfile_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 = {
	.nopage		= filemap_nopage,
	.populate	= filemap_populate,
	.page_mkwrite	= xfs_vm_page_mkwrite,
};

#ifdef HAVE_DMAPI
static struct vm_operations_struct xfs_dmapi_file_vm_ops = {
	.nopage		= xfs_vm_nopage,
	.populate	= filemap_populate,
	.page_mkwrite	= xfs_vm_page_mkwrite,
#ifdef HAVE_VMOP_MPROTECT
	.mprotect	= xfs_vm_mprotect,
#endif
};
#endif /* HAVE_DMAPI */