[net-next-2.6.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 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 /* 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_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;
	vma->vm_flags |= VM_CAN_INVALIDATE;

#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(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,
	.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 = {
	.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	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
bb3f724e	215	STATIC struct page *
3562fd45	216	xfs_vm_nopage(
bb3f724e DR	217	struct vm_area_struct *area,
	218	unsigned long address,
	219	int *type)
	220	{
e678fb0d	221	struct inode *inode = area->vm_file->f_path.dentry->d_inode;
67fcaa73	222	bhv_vnode_t *vp = vn_from_inode(inode);
bb3f724e DR	223
bb3f724e DR	224	ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI);
fbc1462b	225	if (XFS_SEND_MMAP(XFS_VFSTOM(vp->v_vfsp), area, 0))
bb3f724e	226	return NULL;
bb3f724e DR	227	return filemap_nopage(area, address, type);
bb3f724e DR	228	}
bb3f724e DR	229	#endif /* CONFIG_XFS_DMAPI */
bb3f724e DR	230
1da177e4	231	STATIC int
3562fd45	232	xfs_file_readdir(
1da177e4 LT	233	struct file *filp,
	234	void *dirent,
	235	filldir_t filldir)
	236	{
	237	int error = 0;
e678fb0d	238	bhv_vnode_t *vp = vn_from_inode(filp->f_path.dentry->d_inode);
1da177e4 LT	239	uio_t uio;
	240	iovec_t iov;
	241	int eof = 0;
	242	caddr_t read_buf;
	243	int namelen, size = 0;
	244	size_t rlen = PAGE_CACHE_SIZE;
	245	xfs_off_t start_offset, curr_offset;
	246	xfs_dirent_t *dbp = NULL;
	247
1da177e4 LT	248	/* Try fairly hard to get memory */
1da177e4 LT	249	do {
f52720ca	250	if ((read_buf = kmalloc(rlen, GFP_KERNEL)))
1da177e4 LT	251	break;
	252	rlen >>= 1;
	253	} while (rlen >= 1024);
	254
	255	if (read_buf == NULL)
	256	return -ENOMEM;
	257
	258	uio.uio_iov = &iov;
	259	uio.uio_segflg = UIO_SYSSPACE;
	260	curr_offset = filp->f_pos;
	261	if (filp->f_pos != 0x7fffffff)
	262	uio.uio_offset = filp->f_pos;
	263	else
	264	uio.uio_offset = 0xffffffff;
	265
	266	while (!eof) {
	267	uio.uio_resid = iov.iov_len = rlen;
	268	iov.iov_base = read_buf;
	269	uio.uio_iovcnt = 1;
	270
	271	start_offset = uio.uio_offset;
	272
67fcaa73	273	error = bhv_vop_readdir(vp, &uio, NULL, &eof);
1da177e4 LT	274	if ((uio.uio_offset == start_offset) \|\| error) {
	275	size = 0;
	276	break;
	277	}
	278
	279	size = rlen - uio.uio_resid;
	280	dbp = (xfs_dirent_t *)read_buf;
	281	while (size > 0) {
	282	namelen = strlen(dbp->d_name);
	283
	284	if (filldir(dirent, dbp->d_name, namelen,
	285	(loff_t) curr_offset & 0x7fffffff,
	286	(ino_t) dbp->d_ino,
	287	DT_UNKNOWN)) {
	288	goto done;
	289	}
	290	size -= dbp->d_reclen;
	291	curr_offset = (loff_t)dbp->d_off /* & 0x7fffffff */;
1b895840	292	dbp = (xfs_dirent_t )((char )dbp + dbp->d_reclen);
1da177e4 LT	293	}
	294	}
	295	done:
	296	if (!error) {
	297	if (size == 0)
	298	filp->f_pos = uio.uio_offset & 0x7fffffff;
	299	else if (dbp)
	300	filp->f_pos = curr_offset;
	301	}
	302
	303	kfree(read_buf);
	304	return -error;
	305	}
	306
1da177e4	307	STATIC int
3562fd45	308	xfs_file_mmap(
1da177e4 LT	309	struct file *filp,
	310	struct vm_area_struct *vma)
	311	{
3562fd45	312	vma->vm_ops = &xfs_file_vm_ops;
d00806b1	313	vma->vm_flags \|= VM_CAN_INVALIDATE;
6fac0cb4	314
6fac0cb4	315	#ifdef CONFIG_XFS_DMAPI
e678fb0d	316	if (vn_from_inode(filp->f_path.dentry->d_inode)->v_vfsp->vfs_flag & VFS_DMI)
3562fd45	317	vma->vm_ops = &xfs_dmapi_file_vm_ops;
bb3f724e	318	#endif /* CONFIG_XFS_DMAPI */
1da177e4	319
fbc1462b	320	file_accessed(filp);
1da177e4 LT	321	return 0;
	322	}
	323
1da177e4	324	STATIC long
3562fd45	325	xfs_file_ioctl(
1da177e4 LT	326	struct file *filp,
1da177e4 LT	327	unsigned int cmd,
67fcaa73	328	unsigned long p)
1da177e4 LT	329	{
1da177e4 LT	330	int error;
e678fb0d	331	struct inode *inode = filp->f_path.dentry->d_inode;
67fcaa73	332	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4	333
67fcaa73	334	error = bhv_vop_ioctl(vp, inode, filp, 0, cmd, (void __user *)p);
1da177e4 LT	335	VMODIFY(vp);
	336
	337	/* NOTE: some of the ioctl's return positive #'s as a
	338	* byte count indicating success, such as
	339	* readlink_by_handle. So we don't "sign flip"
	340	* like most other routines. This means true
	341	* errors need to be returned as a negative value.
	342	*/
	343	return error;
	344	}
	345
	346	STATIC long
3562fd45	347	xfs_file_ioctl_invis(
1da177e4 LT	348	struct file *filp,
1da177e4 LT	349	unsigned int cmd,
67fcaa73	350	unsigned long p)
1da177e4	351	{
1b895840	352	int error;
e678fb0d	353	struct inode *inode = filp->f_path.dentry->d_inode;
67fcaa73	354	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4	355
67fcaa73	356	error = bhv_vop_ioctl(vp, inode, filp, IO_INVIS, cmd, (void __user *)p);
1da177e4 LT	357	VMODIFY(vp);
	358
	359	/* NOTE: some of the ioctl's return positive #'s as a
	360	* byte count indicating success, such as
	361	* readlink_by_handle. So we don't "sign flip"
	362	* like most other routines. This means true
	363	* errors need to be returned as a negative value.
	364	*/
	365	return error;
	366	}
	367
bb3f724e	368	#ifdef CONFIG_XFS_DMAPI
1da177e4 LT	369	#ifdef HAVE_VMOP_MPROTECT
1da177e4 LT	370	STATIC int
3562fd45	371	xfs_vm_mprotect(
1da177e4 LT	372	struct vm_area_struct *vma,
	373	unsigned int newflags)
	374	{
e678fb0d	375	bhv_vnode_t *vp = vn_from_inode(vma->vm_file->f_path.dentry->d_inode);
1da177e4 LT	376	int error = 0;
	377
	378	if (vp->v_vfsp->vfs_flag & VFS_DMI) {
	379	if ((vma->vm_flags & VM_MAYSHARE) &&
	380	(newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE)) {
	381	xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
	382
	383	error = XFS_SEND_MMAP(mp, vma, VM_WRITE);
	384	}
	385	}
	386	return error;
	387	}
	388	#endif /* HAVE_VMOP_MPROTECT */
bb3f724e	389	#endif /* CONFIG_XFS_DMAPI */
1da177e4 LT	390
	391	#ifdef HAVE_FOP_OPEN_EXEC
	392	/* If the user is attempting to execute a file that is offline then
	393	* we have to trigger a DMAPI READ event before the file is marked as busy
	394	* otherwise the invisible I/O will not be able to write to the file to bring
	395	* it back online.
	396	*/
	397	STATIC int
3562fd45	398	xfs_file_open_exec(
1da177e4 LT	399	struct inode *inode)
1da177e4 LT	400	{
67fcaa73	401	bhv_vnode_t *vp = vn_from_inode(inode);
1da177e4	402
1d47bec2 NS	403	if (unlikely(vp->v_vfsp->vfs_flag & VFS_DMI)) {
	404	xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
	405	xfs_inode_t *ip = xfs_vtoi(vp);
	406
	407	if (!ip)
	408	return -EINVAL;
	409	if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ))
	410	return -XFS_SEND_DATA(mp, DM_EVENT_READ, vp,
1da177e4	411	0, 0, 0, NULL);
1da177e4	412	}
1d47bec2	413	return 0;
1da177e4 LT	414	}
	415	#endif /* HAVE_FOP_OPEN_EXEC */
	416
4b6f5d20	417	const struct file_operations xfs_file_operations = {
1da177e4 LT	418	.llseek = generic_file_llseek,
1da177e4 LT	419	.read = do_sync_read,
bb3f724e	420	.write = do_sync_write,
3562fd45 NS	421	.aio_read = xfs_file_aio_read,
3562fd45 NS	422	.aio_write = xfs_file_aio_write,
1b895840 NS	423	.splice_read = xfs_file_splice_read,
1b895840 NS	424	.splice_write = xfs_file_splice_write,
3562fd45	425	.unlocked_ioctl = xfs_file_ioctl,
1da177e4	426	#ifdef CONFIG_COMPAT
3562fd45	427	.compat_ioctl = xfs_file_compat_ioctl,
1da177e4	428	#endif
3562fd45 NS	429	.mmap = xfs_file_mmap,
	430	.open = xfs_file_open,
	431	.release = xfs_file_release,
	432	.fsync = xfs_file_fsync,
1da177e4	433	#ifdef HAVE_FOP_OPEN_EXEC
3562fd45	434	.open_exec = xfs_file_open_exec,
1da177e4 LT	435	#endif
	436	};
	437
4b6f5d20	438	const struct file_operations xfs_invis_file_operations = {
1da177e4 LT	439	.llseek = generic_file_llseek,
1da177e4 LT	440	.read = do_sync_read,
bb3f724e	441	.write = do_sync_write,
3562fd45 NS	442	.aio_read = xfs_file_aio_read_invis,
3562fd45 NS	443	.aio_write = xfs_file_aio_write_invis,
1b895840 NS	444	.splice_read = xfs_file_splice_read_invis,
1b895840 NS	445	.splice_write = xfs_file_splice_write_invis,
3562fd45	446	.unlocked_ioctl = xfs_file_ioctl_invis,
1da177e4	447	#ifdef CONFIG_COMPAT
3562fd45	448	.compat_ioctl = xfs_file_compat_invis_ioctl,
1da177e4	449	#endif
3562fd45 NS	450	.mmap = xfs_file_mmap,
	451	.open = xfs_file_open,
	452	.release = xfs_file_release,
	453	.fsync = xfs_file_fsync,
1da177e4 LT	454	};
	455
	456
4b6f5d20	457	const struct file_operations xfs_dir_file_operations = {
1da177e4	458	.read = generic_read_dir,
3562fd45 NS	459	.readdir = xfs_file_readdir,
3562fd45 NS	460	.unlocked_ioctl = xfs_file_ioctl,
d3870398	461	#ifdef CONFIG_COMPAT
3562fd45	462	.compat_ioctl = xfs_file_compat_ioctl,
d3870398	463	#endif
3562fd45	464	.fsync = xfs_file_fsync,
1da177e4 LT	465	};
1da177e4 LT	466
3562fd45	467	static struct vm_operations_struct xfs_file_vm_ops = {
1da177e4 LT	468	.nopage = filemap_nopage,
1da177e4 LT	469	.populate = filemap_populate,
6fac0cb4 DR	470	};
	471
	472	#ifdef CONFIG_XFS_DMAPI
3562fd45 NS	473	static struct vm_operations_struct xfs_dmapi_file_vm_ops = {
3562fd45 NS	474	.nopage = xfs_vm_nopage,
6fac0cb4	475	.populate = filemap_populate,
1da177e4	476	#ifdef HAVE_VMOP_MPROTECT
3562fd45	477	.mprotect = xfs_vm_mprotect,
1da177e4 LT	478	#endif
1da177e4 LT	479	};
6fac0cb4	480	#endif /* CONFIG_XFS_DMAPI */