[mirror_ubuntu-bionic-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_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_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_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_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_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_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_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_close(
	struct file	*filp,
	fl_owner_t	id)
{
	return -bhv_vop_close(vn_from_inode(filp->f_dentry->d_inode), 0,
				file_count(filp) > 1 ? L_FALSE : L_TRUE, 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 struct page *
xfs_vm_nopage(
	struct vm_area_struct	*area,
	unsigned long		address,
	int			*type)
{
	struct inode	*inode = area->vm_file->f_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 /* CONFIG_XFS_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_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 CONFIG_XFS_DMAPI
	if (vn_from_inode(filp->f_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_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_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_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(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 */

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,
	.flush		= xfs_file_close,
	.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,
	.flush		= xfs_file_close,
	.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,
};

#ifdef CONFIG_XFS_DMAPI
static struct vm_operations_struct xfs_dmapi_file_vm_ops = {
	.nopage		= xfs_vm_nopage,
	.populate	= filemap_populate,
#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 LT	48
1da177e4 LT	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;
67fcaa73	58	bhv_vnode_t *vp = vn_from_inode(file->f_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
1da177e4	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
1da177e4	126	STATIC ssize_t
3562fd45	127	xfs_file_sendfile(
1da177e4	128	struct file *filp,
1b895840	129	loff_t *pos,
1da177e4 LT	130	size_t count,
	131	read_actor_t actor,
	132	void *target)
	133	{
67fcaa73 NS	134	return bhv_vop_sendfile(vn_from_inode(filp->f_dentry->d_inode),
67fcaa73 NS	135	filp, pos, 0, count, actor, target, NULL);
1da177e4 LT	136	}
1da177e4 LT	137
1b895840 NS	138	STATIC ssize_t
	139	xfs_file_sendfile_invis(
	140	struct file *filp,
	141	loff_t *pos,
	142	size_t count,
	143	read_actor_t actor,
	144	void *target)
	145	{
67fcaa73 NS	146	return bhv_vop_sendfile(vn_from_inode(filp->f_dentry->d_inode),
67fcaa73 NS	147	filp, pos, IO_INVIS, count, actor, target, NULL);
1b895840 NS	148	}
	149
	150	STATIC ssize_t
	151	xfs_file_splice_read(
	152	struct file *infilp,
cbb7e577	153	loff_t *ppos,
3a326a2c	154	struct pipe_inode_info *pipe,
1b895840 NS	155	size_t len,
	156	unsigned int flags)
	157	{
67fcaa73 NS	158	return bhv_vop_splice_read(vn_from_inode(infilp->f_dentry->d_inode),
67fcaa73 NS	159	infilp, ppos, pipe, len, flags, 0, NULL);
1b895840 NS	160	}
	161
	162	STATIC ssize_t
	163	xfs_file_splice_read_invis(
	164	struct file *infilp,
cbb7e577	165	loff_t *ppos,
3a326a2c	166	struct pipe_inode_info *pipe,
1b895840 NS	167	size_t len,
	168	unsigned int flags)
	169	{
67fcaa73 NS	170	return bhv_vop_splice_read(vn_from_inode(infilp->f_dentry->d_inode),
	171	infilp, ppos, pipe, len, flags, IO_INVIS,
	172	NULL);
1b895840 NS	173	}
	174
	175	STATIC ssize_t
	176	xfs_file_splice_write(
3a326a2c	177	struct pipe_inode_info *pipe,
1b895840	178	struct file *outfilp,
cbb7e577	179	loff_t *ppos,
1b895840 NS	180	size_t len,
	181	unsigned int flags)
	182	{
67fcaa73 NS	183	return bhv_vop_splice_write(vn_from_inode(outfilp->f_dentry->d_inode),
67fcaa73 NS	184	pipe, outfilp, ppos, len, flags, 0, NULL);
1b895840 NS	185	}
	186
	187	STATIC ssize_t
	188	xfs_file_splice_write_invis(
3a326a2c	189	struct pipe_inode_info *pipe,
1b895840	190	struct file *outfilp,
cbb7e577	191	loff_t *ppos,
1b895840 NS	192	size_t len,
	193	unsigned int flags)
	194	{
67fcaa73 NS	195	return bhv_vop_splice_write(vn_from_inode(outfilp->f_dentry->d_inode),
	196	pipe, outfilp, ppos, len, flags, IO_INVIS,
	197	NULL);
1b895840	198	}
1da177e4 LT	199
1da177e4 LT	200	STATIC int
3562fd45	201	xfs_file_open(
1da177e4 LT	202	struct inode *inode,
	203	struct file *filp)
	204	{
1da177e4 LT	205	if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
1da177e4 LT	206	return -EFBIG;
67fcaa73	207	return -bhv_vop_open(vn_from_inode(inode), NULL);
1da177e4 LT	208	}
1da177e4 LT	209
7d4fb40a NS	210	STATIC int
7d4fb40a NS	211	xfs_file_close(
1e788f8d AD	212	struct file *filp,
1e788f8d AD	213	fl_owner_t id)
7d4fb40a	214	{
67fcaa73 NS	215	return -bhv_vop_close(vn_from_inode(filp->f_dentry->d_inode), 0,
67fcaa73 NS	216	file_count(filp) > 1 ? L_FALSE : L_TRUE, NULL);
7d4fb40a NS	217	}
7d4fb40a NS	218
1da177e4	219	STATIC int
3562fd45	220	xfs_file_release(
1da177e4 LT	221	struct inode *inode,
	222	struct file *filp)
	223	{
67fcaa73	224	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4 LT	225
1da177e4 LT	226	if (vp)
67fcaa73 NS	227	return -bhv_vop_release(vp);
67fcaa73 NS	228	return 0;
1da177e4 LT	229	}
1da177e4 LT	230
1da177e4	231	STATIC int
3562fd45	232	xfs_file_fsync(
1da177e4 LT	233	struct file *filp,
	234	struct dentry *dentry,
	235	int datasync)
	236	{
67fcaa73	237	bhv_vnode_t *vp = vn_from_inode(dentry->d_inode);
1da177e4 LT	238	int flags = FSYNC_WAIT;
	239
	240	if (datasync)
	241	flags \|= FSYNC_DATA;
7d4fb40a NS	242	if (VN_TRUNC(vp))
7d4fb40a NS	243	VUNTRUNCATE(vp);
67fcaa73	244	return -bhv_vop_fsync(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1);
1da177e4 LT	245	}
1da177e4 LT	246
bb3f724e	247	#ifdef CONFIG_XFS_DMAPI
bb3f724e	248	STATIC struct page *
3562fd45	249	xfs_vm_nopage(
bb3f724e DR	250	struct vm_area_struct *area,
	251	unsigned long address,
	252	int *type)
	253	{
	254	struct inode *inode = area->vm_file->f_dentry->d_inode;
67fcaa73	255	bhv_vnode_t *vp = vn_from_inode(inode);
bb3f724e DR	256
bb3f724e DR	257	ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI);
fbc1462b	258	if (XFS_SEND_MMAP(XFS_VFSTOM(vp->v_vfsp), area, 0))
bb3f724e	259	return NULL;
bb3f724e DR	260	return filemap_nopage(area, address, type);
bb3f724e DR	261	}
bb3f724e DR	262	#endif /* CONFIG_XFS_DMAPI */
bb3f724e DR	263
1da177e4	264	STATIC int
3562fd45	265	xfs_file_readdir(
1da177e4 LT	266	struct file *filp,
	267	void *dirent,
	268	filldir_t filldir)
	269	{
	270	int error = 0;
67fcaa73	271	bhv_vnode_t *vp = vn_from_inode(filp->f_dentry->d_inode);
1da177e4 LT	272	uio_t uio;
	273	iovec_t iov;
	274	int eof = 0;
	275	caddr_t read_buf;
	276	int namelen, size = 0;
	277	size_t rlen = PAGE_CACHE_SIZE;
	278	xfs_off_t start_offset, curr_offset;
	279	xfs_dirent_t *dbp = NULL;
	280
1da177e4 LT	281	/* Try fairly hard to get memory */
1da177e4 LT	282	do {
f52720ca	283	if ((read_buf = kmalloc(rlen, GFP_KERNEL)))
1da177e4 LT	284	break;
	285	rlen >>= 1;
	286	} while (rlen >= 1024);
	287
	288	if (read_buf == NULL)
	289	return -ENOMEM;
	290
	291	uio.uio_iov = &iov;
	292	uio.uio_segflg = UIO_SYSSPACE;
	293	curr_offset = filp->f_pos;
	294	if (filp->f_pos != 0x7fffffff)
	295	uio.uio_offset = filp->f_pos;
	296	else
	297	uio.uio_offset = 0xffffffff;
	298
	299	while (!eof) {
	300	uio.uio_resid = iov.iov_len = rlen;
	301	iov.iov_base = read_buf;
	302	uio.uio_iovcnt = 1;
	303
	304	start_offset = uio.uio_offset;
	305
67fcaa73	306	error = bhv_vop_readdir(vp, &uio, NULL, &eof);
1da177e4 LT	307	if ((uio.uio_offset == start_offset) \|\| error) {
	308	size = 0;
	309	break;
	310	}
	311
	312	size = rlen - uio.uio_resid;
	313	dbp = (xfs_dirent_t *)read_buf;
	314	while (size > 0) {
	315	namelen = strlen(dbp->d_name);
	316
	317	if (filldir(dirent, dbp->d_name, namelen,
	318	(loff_t) curr_offset & 0x7fffffff,
	319	(ino_t) dbp->d_ino,
	320	DT_UNKNOWN)) {
	321	goto done;
	322	}
	323	size -= dbp->d_reclen;
	324	curr_offset = (loff_t)dbp->d_off /* & 0x7fffffff */;
1b895840	325	dbp = (xfs_dirent_t )((char )dbp + dbp->d_reclen);
1da177e4 LT	326	}
	327	}
	328	done:
	329	if (!error) {
	330	if (size == 0)
	331	filp->f_pos = uio.uio_offset & 0x7fffffff;
	332	else if (dbp)
	333	filp->f_pos = curr_offset;
	334	}
	335
	336	kfree(read_buf);
	337	return -error;
	338	}
	339
1da177e4	340	STATIC int
3562fd45	341	xfs_file_mmap(
1da177e4 LT	342	struct file *filp,
	343	struct vm_area_struct *vma)
	344	{
3562fd45	345	vma->vm_ops = &xfs_file_vm_ops;
6fac0cb4	346
6fac0cb4	347	#ifdef CONFIG_XFS_DMAPI
fbc1462b	348	if (vn_from_inode(filp->f_dentry->d_inode)->v_vfsp->vfs_flag & VFS_DMI)
3562fd45	349	vma->vm_ops = &xfs_dmapi_file_vm_ops;
bb3f724e	350	#endif /* CONFIG_XFS_DMAPI */
1da177e4	351
fbc1462b	352	file_accessed(filp);
1da177e4 LT	353	return 0;
	354	}
	355
1da177e4	356	STATIC long
3562fd45	357	xfs_file_ioctl(
1da177e4 LT	358	struct file *filp,
1da177e4 LT	359	unsigned int cmd,
67fcaa73	360	unsigned long p)
1da177e4 LT	361	{
1da177e4 LT	362	int error;
1f6553f9	363	struct inode *inode = filp->f_dentry->d_inode;
67fcaa73	364	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4	365
67fcaa73	366	error = bhv_vop_ioctl(vp, inode, filp, 0, cmd, (void __user *)p);
1da177e4 LT	367	VMODIFY(vp);
	368
	369	/* NOTE: some of the ioctl's return positive #'s as a
	370	* byte count indicating success, such as
	371	* readlink_by_handle. So we don't "sign flip"
	372	* like most other routines. This means true
	373	* errors need to be returned as a negative value.
	374	*/
	375	return error;
	376	}
	377
	378	STATIC long
3562fd45	379	xfs_file_ioctl_invis(
1da177e4 LT	380	struct file *filp,
1da177e4 LT	381	unsigned int cmd,
67fcaa73	382	unsigned long p)
1da177e4	383	{
1b895840	384	int error;
67fcaa73 NS	385	struct inode *inode = filp->f_dentry->d_inode;
67fcaa73 NS	386	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4	387
67fcaa73	388	error = bhv_vop_ioctl(vp, inode, filp, IO_INVIS, cmd, (void __user *)p);
1da177e4 LT	389	VMODIFY(vp);
	390
	391	/* NOTE: some of the ioctl's return positive #'s as a
	392	* byte count indicating success, such as
	393	* readlink_by_handle. So we don't "sign flip"
	394	* like most other routines. This means true
	395	* errors need to be returned as a negative value.
	396	*/
	397	return error;
	398	}
	399
bb3f724e	400	#ifdef CONFIG_XFS_DMAPI
1da177e4 LT	401	#ifdef HAVE_VMOP_MPROTECT
1da177e4 LT	402	STATIC int
3562fd45	403	xfs_vm_mprotect(
1da177e4 LT	404	struct vm_area_struct *vma,
	405	unsigned int newflags)
	406	{
67fcaa73	407	bhv_vnode_t *vp = vn_from_inode(vma->vm_file->f_dentry->d_inode);
1da177e4 LT	408	int error = 0;
	409
	410	if (vp->v_vfsp->vfs_flag & VFS_DMI) {
	411	if ((vma->vm_flags & VM_MAYSHARE) &&
	412	(newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE)) {
	413	xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
	414
	415	error = XFS_SEND_MMAP(mp, vma, VM_WRITE);
	416	}
	417	}
	418	return error;
	419	}
	420	#endif /* HAVE_VMOP_MPROTECT */
bb3f724e	421	#endif /* CONFIG_XFS_DMAPI */
1da177e4 LT	422
	423	#ifdef HAVE_FOP_OPEN_EXEC
	424	/* If the user is attempting to execute a file that is offline then
	425	* we have to trigger a DMAPI READ event before the file is marked as busy
	426	* otherwise the invisible I/O will not be able to write to the file to bring
	427	* it back online.
	428	*/
	429	STATIC int
3562fd45	430	xfs_file_open_exec(
1da177e4 LT	431	struct inode *inode)
1da177e4 LT	432	{
67fcaa73	433	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4	434
1d47bec2 NS	435	if (unlikely(vp->v_vfsp->vfs_flag & VFS_DMI)) {
	436	xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
	437	xfs_inode_t *ip = xfs_vtoi(vp);
	438
	439	if (!ip)
	440	return -EINVAL;
	441	if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ))
	442	return -XFS_SEND_DATA(mp, DM_EVENT_READ, vp,
1da177e4	443	0, 0, 0, NULL);
1da177e4	444	}
1d47bec2	445	return 0;
1da177e4 LT	446	}
	447	#endif /* HAVE_FOP_OPEN_EXEC */
	448
4b6f5d20	449	const struct file_operations xfs_file_operations = {
1da177e4 LT	450	.llseek = generic_file_llseek,
1da177e4 LT	451	.read = do_sync_read,
bb3f724e	452	.write = do_sync_write,
3562fd45 NS	453	.aio_read = xfs_file_aio_read,
	454	.aio_write = xfs_file_aio_write,
	455	.sendfile = xfs_file_sendfile,
1b895840 NS	456	.splice_read = xfs_file_splice_read,
1b895840 NS	457	.splice_write = xfs_file_splice_write,
3562fd45	458	.unlocked_ioctl = xfs_file_ioctl,
1da177e4	459	#ifdef CONFIG_COMPAT
3562fd45	460	.compat_ioctl = xfs_file_compat_ioctl,
1da177e4	461	#endif
3562fd45 NS	462	.mmap = xfs_file_mmap,
3562fd45 NS	463	.open = xfs_file_open,
7d4fb40a	464	.flush = xfs_file_close,
3562fd45 NS	465	.release = xfs_file_release,
3562fd45 NS	466	.fsync = xfs_file_fsync,
1da177e4	467	#ifdef HAVE_FOP_OPEN_EXEC
3562fd45	468	.open_exec = xfs_file_open_exec,
1da177e4 LT	469	#endif
	470	};
	471
4b6f5d20	472	const struct file_operations xfs_invis_file_operations = {
1da177e4 LT	473	.llseek = generic_file_llseek,
1da177e4 LT	474	.read = do_sync_read,
bb3f724e	475	.write = do_sync_write,
3562fd45 NS	476	.aio_read = xfs_file_aio_read_invis,
3562fd45 NS	477	.aio_write = xfs_file_aio_write_invis,
1b895840 NS	478	.sendfile = xfs_file_sendfile_invis,
	479	.splice_read = xfs_file_splice_read_invis,
	480	.splice_write = xfs_file_splice_write_invis,
3562fd45	481	.unlocked_ioctl = xfs_file_ioctl_invis,
1da177e4	482	#ifdef CONFIG_COMPAT
3562fd45	483	.compat_ioctl = xfs_file_compat_invis_ioctl,
1da177e4	484	#endif
3562fd45 NS	485	.mmap = xfs_file_mmap,
3562fd45 NS	486	.open = xfs_file_open,
7d4fb40a	487	.flush = xfs_file_close,
3562fd45 NS	488	.release = xfs_file_release,
3562fd45 NS	489	.fsync = xfs_file_fsync,
1da177e4 LT	490	};
	491
	492
4b6f5d20	493	const struct file_operations xfs_dir_file_operations = {
1da177e4	494	.read = generic_read_dir,
3562fd45 NS	495	.readdir = xfs_file_readdir,
3562fd45 NS	496	.unlocked_ioctl = xfs_file_ioctl,
d3870398	497	#ifdef CONFIG_COMPAT
3562fd45	498	.compat_ioctl = xfs_file_compat_ioctl,
d3870398	499	#endif
3562fd45	500	.fsync = xfs_file_fsync,
1da177e4 LT	501	};
1da177e4 LT	502
3562fd45	503	static struct vm_operations_struct xfs_file_vm_ops = {
1da177e4 LT	504	.nopage = filemap_nopage,
1da177e4 LT	505	.populate = filemap_populate,
6fac0cb4 DR	506	};
	507
	508	#ifdef CONFIG_XFS_DMAPI
3562fd45 NS	509	static struct vm_operations_struct xfs_dmapi_file_vm_ops = {
3562fd45 NS	510	.nopage = xfs_vm_nopage,
6fac0cb4	511	.populate = filemap_populate,
1da177e4	512	#ifdef HAVE_VMOP_MPROTECT
3562fd45	513	.mprotect = xfs_vm_mprotect,
1da177e4 LT	514	#endif
1da177e4 LT	515	};
6fac0cb4	516	#endif /* CONFIG_XFS_DMAPI */