[mirror_ubuntu-artful-kernel.git] / fs / xfs / linux-2.6 / xfs_file.c

/*
 * 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 CONFIG_XFS_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_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 CONFIG_XFS_DMAPI
STATIC int
xfs_vm_fault(
	struct vm_area_struct	*vma,
	struct vm_fault	*vmf)
{
	struct inode	*inode = vma->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), vma, 0))
		return VM_FAULT_SIGBUS;
	return filemap_fault(vma, vmf);
}
#endif /* CONFIG_XFS_DMAPI */

STATIC int
xfs_file_readdir(
	struct file	*filp,
	void		*dirent,
	filldir_t	filldir)
{
	struct inode	*inode = filp->f_path.dentry->d_inode;
	bhv_vnode_t	*vp = vn_from_inode(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 = bhv_vop_readdir(vp, dirent, bufsize,
				(xfs_off_t *)&filp->f_pos, filldir);
	if (error)
		return -error;
	return 0;
}

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;

#ifdef CONFIG_XFS_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 /* CONFIG_XFS_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 CONFIG_XFS_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 /* CONFIG_XFS_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(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,
	.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,
};

#ifdef CONFIG_XFS_DMAPI
static struct vm_operations_struct xfs_dmapi_file_vm_ops = {
	.fault		= xfs_vm_fault,
	.page_mkwrite	= xfs_vm_page_mkwrite,
#ifdef HAVE_VMOP_MPROTECT
	.mprotect	= xfs_vm_mprotect,
#endif
};
#endif /* CONFIG_XFS_DMAPI */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4	17	*/
1da177e4	18	#include "xfs.h"
a844f451	19	#include "xfs_bit.h"
1da177e4	20	#include "xfs_log.h"
a844f451	21	#include "xfs_inum.h"
1da177e4	22	#include "xfs_sb.h"
a844f451	23	#include "xfs_ag.h"
1da177e4 LT	24	#include "xfs_dir2.h"
	25	#include "xfs_trans.h"
	26	#include "xfs_dmapi.h"
	27	#include "xfs_mount.h"
	28	#include "xfs_bmap_btree.h"
	29	#include "xfs_alloc_btree.h"
	30	#include "xfs_ialloc_btree.h"
	31	#include "xfs_alloc.h"
	32	#include "xfs_btree.h"
	33	#include "xfs_attr_sf.h"
1da177e4 LT	34	#include "xfs_dir2_sf.h"
	35	#include "xfs_dinode.h"
	36	#include "xfs_inode.h"
	37	#include "xfs_error.h"
	38	#include "xfs_rw.h"
	39	#include "xfs_ioctl32.h"
	40
	41	#include <linux/dcache.h>
	42	#include <linux/smp_lock.h>
	43
3562fd45	44	static struct vm_operations_struct xfs_file_vm_ops;
6fac0cb4	45	#ifdef CONFIG_XFS_DMAPI
3562fd45	46	static struct vm_operations_struct xfs_dmapi_file_vm_ops;
6fac0cb4	47	#endif
1da177e4	48
7989cb8e	49	STATIC_INLINE ssize_t
3562fd45	50	__xfs_file_read(
1da177e4	51	struct kiocb *iocb,
027445c3 BP	52	const struct iovec *iov,
027445c3 BP	53	unsigned long nr_segs,
1da177e4	54	int ioflags,
1da177e4 LT	55	loff_t pos)
1da177e4 LT	56	{
1da177e4	57	struct file *file = iocb->ki_filp;
e678fb0d	58	bhv_vnode_t *vp = vn_from_inode(file->f_path.dentry->d_inode);
1da177e4 LT	59
1da177e4 LT	60	BUG_ON(iocb->ki_pos != pos);
1da177e4 LT	61	if (unlikely(file->f_flags & O_DIRECT))
1da177e4 LT	62	ioflags \|= IO_ISDIRECT;
027445c3 BP	63	return bhv_vop_read(vp, iocb, iov, nr_segs, &iocb->ki_pos,
027445c3 BP	64	ioflags, NULL);
1da177e4 LT	65	}
1da177e4 LT	66
1da177e4	67	STATIC ssize_t
3562fd45	68	xfs_file_aio_read(
1da177e4	69	struct kiocb *iocb,
027445c3 BP	70	const struct iovec *iov,
027445c3 BP	71	unsigned long nr_segs,
1da177e4 LT	72	loff_t pos)
1da177e4 LT	73	{
027445c3	74	return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO, pos);
1da177e4 LT	75	}
	76
	77	STATIC ssize_t
3562fd45	78	xfs_file_aio_read_invis(
1da177e4	79	struct kiocb *iocb,
027445c3 BP	80	const struct iovec *iov,
027445c3 BP	81	unsigned long nr_segs,
1da177e4 LT	82	loff_t pos)
1da177e4 LT	83	{
027445c3	84	return __xfs_file_read(iocb, iov, nr_segs, IO_ISAIO\|IO_INVIS, pos);
1da177e4 LT	85	}
1da177e4 LT	86
7989cb8e	87	STATIC_INLINE ssize_t
3562fd45	88	__xfs_file_write(
027445c3 BP	89	struct kiocb *iocb,
	90	const struct iovec *iov,
	91	unsigned long nr_segs,
	92	int ioflags,
	93	loff_t pos)
1da177e4	94	{
1da177e4 LT	95	struct file *file = iocb->ki_filp;
1da177e4 LT	96	struct inode *inode = file->f_mapping->host;
67fcaa73	97	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4 LT	98
	99	BUG_ON(iocb->ki_pos != pos);
	100	if (unlikely(file->f_flags & O_DIRECT))
	101	ioflags \|= IO_ISDIRECT;
027445c3 BP	102	return bhv_vop_write(vp, iocb, iov, nr_segs, &iocb->ki_pos,
027445c3 BP	103	ioflags, NULL);
1da177e4 LT	104	}
1da177e4 LT	105
1da177e4	106	STATIC ssize_t
3562fd45	107	xfs_file_aio_write(
1da177e4	108	struct kiocb *iocb,
027445c3 BP	109	const struct iovec *iov,
027445c3 BP	110	unsigned long nr_segs,
1da177e4 LT	111	loff_t pos)
1da177e4 LT	112	{
027445c3	113	return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO, pos);
1da177e4 LT	114	}
	115
	116	STATIC ssize_t
3562fd45	117	xfs_file_aio_write_invis(
1da177e4	118	struct kiocb *iocb,
027445c3 BP	119	const struct iovec *iov,
027445c3 BP	120	unsigned long nr_segs,
1da177e4 LT	121	loff_t pos)
1da177e4 LT	122	{
027445c3	123	return __xfs_file_write(iocb, iov, nr_segs, IO_ISAIO\|IO_INVIS, pos);
1da177e4 LT	124	}
1da177e4 LT	125
1b895840 NS	126	STATIC ssize_t
	127	xfs_file_splice_read(
	128	struct file *infilp,
cbb7e577	129	loff_t *ppos,
3a326a2c	130	struct pipe_inode_info *pipe,
1b895840 NS	131	size_t len,
	132	unsigned int flags)
	133	{
e678fb0d	134	return bhv_vop_splice_read(vn_from_inode(infilp->f_path.dentry->d_inode),
67fcaa73	135	infilp, ppos, pipe, len, flags, 0, NULL);
1b895840 NS	136	}
	137
	138	STATIC ssize_t
	139	xfs_file_splice_read_invis(
	140	struct file *infilp,
cbb7e577	141	loff_t *ppos,
3a326a2c	142	struct pipe_inode_info *pipe,
1b895840 NS	143	size_t len,
	144	unsigned int flags)
	145	{
e678fb0d	146	return bhv_vop_splice_read(vn_from_inode(infilp->f_path.dentry->d_inode),
67fcaa73 NS	147	infilp, ppos, pipe, len, flags, IO_INVIS,
67fcaa73 NS	148	NULL);
1b895840 NS	149	}
	150
	151	STATIC ssize_t
	152	xfs_file_splice_write(
3a326a2c	153	struct pipe_inode_info *pipe,
1b895840	154	struct file *outfilp,
cbb7e577	155	loff_t *ppos,
1b895840 NS	156	size_t len,
	157	unsigned int flags)
	158	{
e678fb0d	159	return bhv_vop_splice_write(vn_from_inode(outfilp->f_path.dentry->d_inode),
67fcaa73	160	pipe, outfilp, ppos, len, flags, 0, NULL);
1b895840 NS	161	}
	162
	163	STATIC ssize_t
	164	xfs_file_splice_write_invis(
3a326a2c	165	struct pipe_inode_info *pipe,
1b895840	166	struct file *outfilp,
cbb7e577	167	loff_t *ppos,
1b895840 NS	168	size_t len,
	169	unsigned int flags)
	170	{
e678fb0d	171	return bhv_vop_splice_write(vn_from_inode(outfilp->f_path.dentry->d_inode),
67fcaa73 NS	172	pipe, outfilp, ppos, len, flags, IO_INVIS,
67fcaa73 NS	173	NULL);
1b895840	174	}
1da177e4 LT	175
1da177e4 LT	176	STATIC int
3562fd45	177	xfs_file_open(
1da177e4 LT	178	struct inode *inode,
	179	struct file *filp)
	180	{
1da177e4 LT	181	if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
1da177e4 LT	182	return -EFBIG;
67fcaa73	183	return -bhv_vop_open(vn_from_inode(inode), NULL);
1da177e4 LT	184	}
1da177e4 LT	185
1da177e4	186	STATIC int
3562fd45	187	xfs_file_release(
1da177e4 LT	188	struct inode *inode,
	189	struct file *filp)
	190	{
67fcaa73	191	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4 LT	192
1da177e4 LT	193	if (vp)
67fcaa73 NS	194	return -bhv_vop_release(vp);
67fcaa73 NS	195	return 0;
1da177e4 LT	196	}
1da177e4 LT	197
1da177e4	198	STATIC int
3562fd45	199	xfs_file_fsync(
1da177e4 LT	200	struct file *filp,
	201	struct dentry *dentry,
	202	int datasync)
	203	{
67fcaa73	204	bhv_vnode_t *vp = vn_from_inode(dentry->d_inode);
1da177e4 LT	205	int flags = FSYNC_WAIT;
	206
	207	if (datasync)
	208	flags \|= FSYNC_DATA;
7d4fb40a NS	209	if (VN_TRUNC(vp))
7d4fb40a NS	210	VUNTRUNCATE(vp);
67fcaa73	211	return -bhv_vop_fsync(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1);
1da177e4 LT	212	}
1da177e4 LT	213
bb3f724e	214	#ifdef CONFIG_XFS_DMAPI
d0217ac0	215	STATIC int
54cb8821 NP	216	xfs_vm_fault(
54cb8821 NP	217	struct vm_area_struct *vma,
d0217ac0	218	struct vm_fault *vmf)
bb3f724e	219	{
54cb8821	220	struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
67fcaa73	221	bhv_vnode_t *vp = vn_from_inode(inode);
bb3f724e DR	222
bb3f724e DR	223	ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI);
d0217ac0 NP	224	if (XFS_SEND_MMAP(XFS_VFSTOM(vp->v_vfsp), vma, 0))
	225	return VM_FAULT_SIGBUS;
	226	return filemap_fault(vma, vmf);
bb3f724e	227	}
bb3f724e DR	228	#endif /* CONFIG_XFS_DMAPI */
bb3f724e DR	229
1da177e4	230	STATIC int
3562fd45	231	xfs_file_readdir(
1da177e4 LT	232	struct file *filp,
	233	void *dirent,
	234	filldir_t filldir)
	235	{
051e7cd4 CH	236	struct inode *inode = filp->f_path.dentry->d_inode;
	237	bhv_vnode_t *vp = vn_from_inode(inode);
	238	int error;
	239	size_t bufsize;
	240
	241	/*
	242	* The Linux API doesn't pass down the total size of the buffer
	243	* we read into down to the filesystem. With the filldir concept
	244	* it's not needed for correct information, but the XFS dir2 leaf
	245	* code wants an estimate of the buffer size to calculate it's
	246	* readahead window and size the buffers used for mapping to
	247	* physical blocks.
	248	*
	249	* Try to give it an estimate that's good enough, maybe at some
	250	* point we can change the ->readdir prototype to include the
	251	* buffer size.
	252	*/
	253	bufsize = (size_t)min_t(loff_t, PAGE_SIZE, inode->i_size);
	254
	255	error = bhv_vop_readdir(vp, dirent, bufsize,
	256	(xfs_off_t *)&filp->f_pos, filldir);
	257	if (error)
	258	return -error;
	259	return 0;
1da177e4 LT	260	}
1da177e4 LT	261
1da177e4	262	STATIC int
3562fd45	263	xfs_file_mmap(
1da177e4 LT	264	struct file *filp,
	265	struct vm_area_struct *vma)
	266	{
3562fd45	267	vma->vm_ops = &xfs_file_vm_ops;
d0217ac0	268	vma->vm_flags \|= VM_CAN_NONLINEAR;
6fac0cb4	269
6fac0cb4	270	#ifdef CONFIG_XFS_DMAPI
e678fb0d	271	if (vn_from_inode(filp->f_path.dentry->d_inode)->v_vfsp->vfs_flag & VFS_DMI)
3562fd45	272	vma->vm_ops = &xfs_dmapi_file_vm_ops;
bb3f724e	273	#endif /* CONFIG_XFS_DMAPI */
1da177e4	274
fbc1462b	275	file_accessed(filp);
1da177e4 LT	276	return 0;
	277	}
	278
1da177e4	279	STATIC long
3562fd45	280	xfs_file_ioctl(
1da177e4 LT	281	struct file *filp,
1da177e4 LT	282	unsigned int cmd,
67fcaa73	283	unsigned long p)
1da177e4 LT	284	{
1da177e4 LT	285	int error;
e678fb0d	286	struct inode *inode = filp->f_path.dentry->d_inode;
67fcaa73	287	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4	288
67fcaa73	289	error = bhv_vop_ioctl(vp, inode, filp, 0, cmd, (void __user *)p);
1da177e4 LT	290	VMODIFY(vp);
	291
	292	/* NOTE: some of the ioctl's return positive #'s as a
	293	* byte count indicating success, such as
	294	* readlink_by_handle. So we don't "sign flip"
	295	* like most other routines. This means true
	296	* errors need to be returned as a negative value.
	297	*/
	298	return error;
	299	}
	300
	301	STATIC long
3562fd45	302	xfs_file_ioctl_invis(
1da177e4 LT	303	struct file *filp,
1da177e4 LT	304	unsigned int cmd,
67fcaa73	305	unsigned long p)
1da177e4	306	{
1b895840	307	int error;
e678fb0d	308	struct inode *inode = filp->f_path.dentry->d_inode;
67fcaa73	309	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4	310
67fcaa73	311	error = bhv_vop_ioctl(vp, inode, filp, IO_INVIS, cmd, (void __user *)p);
1da177e4 LT	312	VMODIFY(vp);
	313
	314	/* NOTE: some of the ioctl's return positive #'s as a
	315	* byte count indicating success, such as
	316	* readlink_by_handle. So we don't "sign flip"
	317	* like most other routines. This means true
	318	* errors need to be returned as a negative value.
	319	*/
	320	return error;
	321	}
	322
bb3f724e	323	#ifdef CONFIG_XFS_DMAPI
1da177e4 LT	324	#ifdef HAVE_VMOP_MPROTECT
1da177e4 LT	325	STATIC int
3562fd45	326	xfs_vm_mprotect(
1da177e4 LT	327	struct vm_area_struct *vma,
	328	unsigned int newflags)
	329	{
e678fb0d	330	bhv_vnode_t *vp = vn_from_inode(vma->vm_file->f_path.dentry->d_inode);
1da177e4 LT	331	int error = 0;
	332
	333	if (vp->v_vfsp->vfs_flag & VFS_DMI) {
	334	if ((vma->vm_flags & VM_MAYSHARE) &&
	335	(newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE)) {
	336	xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
	337
	338	error = XFS_SEND_MMAP(mp, vma, VM_WRITE);
	339	}
	340	}
	341	return error;
	342	}
	343	#endif /* HAVE_VMOP_MPROTECT */
bb3f724e	344	#endif /* CONFIG_XFS_DMAPI */
1da177e4 LT	345
	346	#ifdef HAVE_FOP_OPEN_EXEC
	347	/* If the user is attempting to execute a file that is offline then
	348	* we have to trigger a DMAPI READ event before the file is marked as busy
	349	* otherwise the invisible I/O will not be able to write to the file to bring
	350	* it back online.
	351	*/
	352	STATIC int
3562fd45	353	xfs_file_open_exec(
1da177e4 LT	354	struct inode *inode)
1da177e4 LT	355	{
67fcaa73	356	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4	357
1d47bec2 NS	358	if (unlikely(vp->v_vfsp->vfs_flag & VFS_DMI)) {
	359	xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
	360	xfs_inode_t *ip = xfs_vtoi(vp);
	361
	362	if (!ip)
	363	return -EINVAL;
eb9df39d	364	if (DM_EVENT_ENABLED(ip, DM_EVENT_READ))
1d47bec2	365	return -XFS_SEND_DATA(mp, DM_EVENT_READ, vp,
1da177e4	366	0, 0, 0, NULL);
1da177e4	367	}
1d47bec2	368	return 0;
1da177e4 LT	369	}
	370	#endif /* HAVE_FOP_OPEN_EXEC */
	371
4f57dbc6 DC	372	/*
	373	* mmap()d file has taken write protection fault and is being made
	374	* writable. We can set the page state up correctly for a writable
	375	* page, which means we can do correct delalloc accounting (ENOSPC
	376	* checking!) and unwritten extent mapping.
	377	*/
	378	STATIC int
	379	xfs_vm_page_mkwrite(
	380	struct vm_area_struct *vma,
	381	struct page *page)
	382	{
	383	return block_page_mkwrite(vma, page, xfs_get_blocks);
	384	}
	385
4b6f5d20	386	const struct file_operations xfs_file_operations = {
1da177e4 LT	387	.llseek = generic_file_llseek,
1da177e4 LT	388	.read = do_sync_read,
bb3f724e	389	.write = do_sync_write,
3562fd45 NS	390	.aio_read = xfs_file_aio_read,
3562fd45 NS	391	.aio_write = xfs_file_aio_write,
1b895840 NS	392	.splice_read = xfs_file_splice_read,
1b895840 NS	393	.splice_write = xfs_file_splice_write,
3562fd45	394	.unlocked_ioctl = xfs_file_ioctl,
1da177e4	395	#ifdef CONFIG_COMPAT
3562fd45	396	.compat_ioctl = xfs_file_compat_ioctl,
1da177e4	397	#endif
3562fd45 NS	398	.mmap = xfs_file_mmap,
	399	.open = xfs_file_open,
	400	.release = xfs_file_release,
	401	.fsync = xfs_file_fsync,
1da177e4	402	#ifdef HAVE_FOP_OPEN_EXEC
3562fd45	403	.open_exec = xfs_file_open_exec,
1da177e4 LT	404	#endif
	405	};
	406
4b6f5d20	407	const struct file_operations xfs_invis_file_operations = {
1da177e4 LT	408	.llseek = generic_file_llseek,
1da177e4 LT	409	.read = do_sync_read,
bb3f724e	410	.write = do_sync_write,
3562fd45 NS	411	.aio_read = xfs_file_aio_read_invis,
3562fd45 NS	412	.aio_write = xfs_file_aio_write_invis,
1b895840 NS	413	.splice_read = xfs_file_splice_read_invis,
1b895840 NS	414	.splice_write = xfs_file_splice_write_invis,
3562fd45	415	.unlocked_ioctl = xfs_file_ioctl_invis,
1da177e4	416	#ifdef CONFIG_COMPAT
3562fd45	417	.compat_ioctl = xfs_file_compat_invis_ioctl,
1da177e4	418	#endif
3562fd45 NS	419	.mmap = xfs_file_mmap,
	420	.open = xfs_file_open,
	421	.release = xfs_file_release,
	422	.fsync = xfs_file_fsync,
1da177e4 LT	423	};
	424
	425
4b6f5d20	426	const struct file_operations xfs_dir_file_operations = {
1da177e4	427	.read = generic_read_dir,
3562fd45 NS	428	.readdir = xfs_file_readdir,
3562fd45 NS	429	.unlocked_ioctl = xfs_file_ioctl,
d3870398	430	#ifdef CONFIG_COMPAT
3562fd45	431	.compat_ioctl = xfs_file_compat_ioctl,
d3870398	432	#endif
3562fd45	433	.fsync = xfs_file_fsync,
1da177e4 LT	434	};
1da177e4 LT	435
3562fd45	436	static struct vm_operations_struct xfs_file_vm_ops = {
54cb8821	437	.fault = filemap_fault,
4f57dbc6	438	.page_mkwrite = xfs_vm_page_mkwrite,
6fac0cb4 DR	439	};
	440
	441	#ifdef CONFIG_XFS_DMAPI
3562fd45	442	static struct vm_operations_struct xfs_dmapi_file_vm_ops = {
54cb8821	443	.fault = xfs_vm_fault,
4f57dbc6	444	.page_mkwrite = xfs_vm_page_mkwrite,
1da177e4	445	#ifdef HAVE_VMOP_MPROTECT
3562fd45	446	.mprotect = xfs_vm_mprotect,
1da177e4 LT	447	#endif
1da177e4 LT	448	};
6fac0cb4	449	#endif /* CONFIG_XFS_DMAPI */