[linux-2.6-block.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_dir.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_dir_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,
	char			__user *buf,
	int			ioflags,
	size_t			count,
	loff_t			pos)
{
	struct iovec		iov = {buf, count};
	struct file		*file = iocb->ki_filp;
	vnode_t			*vp = vn_from_inode(file->f_dentry->d_inode);
	ssize_t			rval;

	BUG_ON(iocb->ki_pos != pos);

	if (unlikely(file->f_flags & O_DIRECT))
		ioflags |= IO_ISDIRECT;
	VOP_READ(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval);
	return rval;
}


STATIC ssize_t
xfs_file_aio_read(
	struct kiocb		*iocb,
	char			__user *buf,
	size_t			count,
	loff_t			pos)
{
	return __xfs_file_read(iocb, buf, IO_ISAIO, count, pos);
}

STATIC ssize_t
xfs_file_aio_read_invis(
	struct kiocb		*iocb,
	char			__user *buf,
	size_t			count,
	loff_t			pos)
{
	return __xfs_file_read(iocb, buf, IO_ISAIO|IO_INVIS, count, pos);
}


STATIC inline ssize_t
__xfs_file_write(
	struct kiocb	*iocb,
	const char	__user *buf,
	int		ioflags,
	size_t		count,
	loff_t		pos)
{
	struct iovec	iov = {(void __user *)buf, count};
	struct file	*file = iocb->ki_filp;
	struct inode	*inode = file->f_mapping->host;
	vnode_t		*vp = vn_from_inode(inode);
	ssize_t		rval;

	BUG_ON(iocb->ki_pos != pos);
	if (unlikely(file->f_flags & O_DIRECT))
		ioflags |= IO_ISDIRECT;

	VOP_WRITE(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval);
	return rval;
}


STATIC ssize_t
xfs_file_aio_write(
	struct kiocb		*iocb,
	const char		__user *buf,
	size_t			count,
	loff_t			pos)
{
	return __xfs_file_write(iocb, buf, IO_ISAIO, count, pos);
}

STATIC ssize_t
xfs_file_aio_write_invis(
	struct kiocb		*iocb,
	const char		__user *buf,
	size_t			count,
	loff_t			pos)
{
	return __xfs_file_write(iocb, buf, IO_ISAIO|IO_INVIS, count, pos);
}


STATIC inline ssize_t
__xfs_file_readv(
	struct file		*file,
	const struct iovec 	*iov,
	int			ioflags,
	unsigned long		nr_segs,
	loff_t			*ppos)
{
	struct inode	*inode = file->f_mapping->host;
	vnode_t		*vp = vn_from_inode(inode);
	struct kiocb	kiocb;
	ssize_t		rval;

	init_sync_kiocb(&kiocb, file);
	kiocb.ki_pos = *ppos;

	if (unlikely(file->f_flags & O_DIRECT))
		ioflags |= IO_ISDIRECT;
	VOP_READ(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval);

	*ppos = kiocb.ki_pos;
	return rval;
}

STATIC ssize_t
xfs_file_readv(
	struct file		*file,
	const struct iovec 	*iov,
	unsigned long		nr_segs,
	loff_t			*ppos)
{
	return __xfs_file_readv(file, iov, 0, nr_segs, ppos);
}

STATIC ssize_t
xfs_file_readv_invis(
	struct file		*file,
	const struct iovec 	*iov,
	unsigned long		nr_segs,
	loff_t			*ppos)
{
	return __xfs_file_readv(file, iov, IO_INVIS, nr_segs, ppos);
}


STATIC inline ssize_t
__xfs_file_writev(
	struct file		*file,
	const struct iovec 	*iov,
	int			ioflags,
	unsigned long		nr_segs,
	loff_t			*ppos)
{
	struct inode	*inode = file->f_mapping->host;
	vnode_t		*vp = vn_from_inode(inode);
	struct kiocb	kiocb;
	ssize_t		rval;

	init_sync_kiocb(&kiocb, file);
	kiocb.ki_pos = *ppos;
	if (unlikely(file->f_flags & O_DIRECT))
		ioflags |= IO_ISDIRECT;

	VOP_WRITE(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval);

	*ppos = kiocb.ki_pos;
	return rval;
}


STATIC ssize_t
xfs_file_writev(
	struct file		*file,
	const struct iovec 	*iov,
	unsigned long		nr_segs,
	loff_t			*ppos)
{
	return __xfs_file_writev(file, iov, 0, nr_segs, ppos);
}

STATIC ssize_t
xfs_file_writev_invis(
	struct file		*file,
	const struct iovec 	*iov,
	unsigned long		nr_segs,
	loff_t			*ppos)
{
	return __xfs_file_writev(file, iov, IO_INVIS, nr_segs, ppos);
}

STATIC ssize_t
xfs_file_sendfile(
	struct file		*filp,
	loff_t			*ppos,
	size_t			count,
	read_actor_t		actor,
	void			*target)
{
	vnode_t			*vp = vn_from_inode(filp->f_dentry->d_inode);
	ssize_t			rval;

	VOP_SENDFILE(vp, filp, ppos, 0, count, actor, target, NULL, rval);
	return rval;
}


STATIC int
xfs_file_open(
	struct inode	*inode,
	struct file	*filp)
{
	vnode_t		*vp = vn_from_inode(inode);
	int		error;

	if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
		return -EFBIG;

	ASSERT(vp);
	VOP_OPEN(vp, NULL, error);
	return -error;
}


STATIC int
xfs_file_release(
	struct inode	*inode,
	struct file	*filp)
{
	vnode_t		*vp = vn_from_inode(inode);
	int		error = 0;

	if (vp)
		VOP_RELEASE(vp, error);
	return -error;
}


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

	if (datasync)
		flags |= FSYNC_DATA;

	ASSERT(vp);
	VOP_FSYNC(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1, error);
	return -error;
}

/*
 * xfs_file_readdir maps to VOP_READDIR().
 * We need to build a uio, cred, ...
 */

#define nextdp(dp)      ((struct xfs_dirent *)((char *)(dp) + (dp)->d_reclen))

#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;
	vnode_t		*vp = vn_from_inode(inode);
	xfs_mount_t	*mp = XFS_VFSTOM(vp->v_vfsp);
	int		error;

	ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI);

	error = XFS_SEND_MMAP(mp, area, 0);
	if (error)
		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;
	vnode_t		*vp;
	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;

	vp = vn_from_inode(filp->f_dentry->d_inode);
	ASSERT(vp);

	/* Try fairly hard to get memory */
	do {
		if ((read_buf = (caddr_t)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;

		VOP_READDIR(vp, &uio, NULL, &eof, error);
		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 = nextdp(dbp);
		}
	}
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)
{
	struct inode	*ip = filp->f_dentry->d_inode;
	vnode_t		*vp = vn_from_inode(ip);
	vattr_t		vattr;
	int		error;

	vma->vm_ops = &xfs_file_vm_ops;

#ifdef CONFIG_XFS_DMAPI
	if (vp->v_vfsp->vfs_flag & VFS_DMI) {
		vma->vm_ops = &xfs_dmapi_file_vm_ops;
	}
#endif /* CONFIG_XFS_DMAPI */

	vattr.va_mask = XFS_AT_UPDATIME;
	VOP_SETATTR(vp, &vattr, XFS_AT_UPDATIME, NULL, error);
	if (likely(!error))
		__vn_revalidate(vp, &vattr);	/* update flags */
	return 0;
}


STATIC long
xfs_file_ioctl(
	struct file	*filp,
	unsigned int	cmd,
	unsigned long	arg)
{
	int		error;
	struct inode	*inode = filp->f_dentry->d_inode;
	vnode_t		*vp = vn_from_inode(inode);

	VOP_IOCTL(vp, inode, filp, 0, cmd, (void __user *)arg, error);
	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	arg)
{
	int		error;
	struct inode	*inode = filp->f_dentry->d_inode;
	vnode_t		*vp = vn_from_inode(inode);

	ASSERT(vp);
	VOP_IOCTL(vp, inode, filp, IO_INVIS, cmd, (void __user *)arg, error);
	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)
{
	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)
{
	vnode_t		*vp = vn_from_inode(inode);
	xfs_mount_t	*mp = XFS_VFSTOM(vp->v_vfsp);
	int		error = 0;
	xfs_inode_t	*ip;

	if (vp->v_vfsp->vfs_flag & VFS_DMI) {
		ip = xfs_vtoi(vp);
		if (!ip) {
			error = -EINVAL;
			goto open_exec_out;
		}
		if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)) {
			error = -XFS_SEND_DATA(mp, DM_EVENT_READ, vp,
					       0, 0, 0, NULL);
		}
	}
open_exec_out:
	return error;
}
#endif /* HAVE_FOP_OPEN_EXEC */

const struct file_operations xfs_file_operations = {
	.llseek		= generic_file_llseek,
	.read		= do_sync_read,
	.write		= do_sync_write,
	.readv		= xfs_file_readv,
	.writev		= xfs_file_writev,
	.aio_read	= xfs_file_aio_read,
	.aio_write	= xfs_file_aio_write,
	.sendfile	= xfs_file_sendfile,
	.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,
	.readv		= xfs_file_readv_invis,
	.writev		= xfs_file_writev_invis,
	.aio_read	= xfs_file_aio_read_invis,
	.aio_write	= xfs_file_aio_write_invis,
	.sendfile	= xfs_file_sendfile,
	.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_dir.h"
	25	#include "xfs_dir2.h"
	26	#include "xfs_trans.h"
	27	#include "xfs_dmapi.h"
	28	#include "xfs_mount.h"
	29	#include "xfs_bmap_btree.h"
	30	#include "xfs_alloc_btree.h"
	31	#include "xfs_ialloc_btree.h"
	32	#include "xfs_alloc.h"
	33	#include "xfs_btree.h"
	34	#include "xfs_attr_sf.h"
	35	#include "xfs_dir_sf.h"
	36	#include "xfs_dir2_sf.h"
	37	#include "xfs_dinode.h"
	38	#include "xfs_inode.h"
	39	#include "xfs_error.h"
	40	#include "xfs_rw.h"
	41	#include "xfs_ioctl32.h"
	42
	43	#include <linux/dcache.h>
	44	#include <linux/smp_lock.h>
	45
3562fd45	46	static struct vm_operations_struct xfs_file_vm_ops;
6fac0cb4	47	#ifdef CONFIG_XFS_DMAPI
3562fd45	48	static struct vm_operations_struct xfs_dmapi_file_vm_ops;
6fac0cb4	49	#endif
1da177e4 LT	50
1da177e4 LT	51	STATIC inline ssize_t
3562fd45	52	__xfs_file_read(
1da177e4 LT	53	struct kiocb *iocb,
	54	char __user *buf,
	55	int ioflags,
	56	size_t count,
	57	loff_t pos)
	58	{
	59	struct iovec iov = {buf, count};
	60	struct file *file = iocb->ki_filp;
ec86dc02	61	vnode_t *vp = vn_from_inode(file->f_dentry->d_inode);
1da177e4 LT	62	ssize_t rval;
	63
	64	BUG_ON(iocb->ki_pos != pos);
	65
	66	if (unlikely(file->f_flags & O_DIRECT))
	67	ioflags \|= IO_ISDIRECT;
	68	VOP_READ(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval);
	69	return rval;
	70	}
	71
	72
	73	STATIC ssize_t
3562fd45	74	xfs_file_aio_read(
1da177e4 LT	75	struct kiocb *iocb,
	76	char __user *buf,
	77	size_t count,
	78	loff_t pos)
	79	{
3562fd45	80	return __xfs_file_read(iocb, buf, IO_ISAIO, count, pos);
1da177e4 LT	81	}
	82
	83	STATIC ssize_t
3562fd45	84	xfs_file_aio_read_invis(
1da177e4 LT	85	struct kiocb *iocb,
	86	char __user *buf,
	87	size_t count,
	88	loff_t pos)
	89	{
3562fd45	90	return __xfs_file_read(iocb, buf, IO_ISAIO\|IO_INVIS, count, pos);
1da177e4 LT	91	}
	92
	93
	94	STATIC inline ssize_t
3562fd45	95	__xfs_file_write(
1da177e4 LT	96	struct kiocb *iocb,
	97	const char __user *buf,
	98	int ioflags,
	99	size_t count,
	100	loff_t pos)
	101	{
	102	struct iovec iov = {(void __user *)buf, count};
	103	struct file *file = iocb->ki_filp;
	104	struct inode *inode = file->f_mapping->host;
ec86dc02	105	vnode_t *vp = vn_from_inode(inode);
1da177e4 LT	106	ssize_t rval;
	107
	108	BUG_ON(iocb->ki_pos != pos);
	109	if (unlikely(file->f_flags & O_DIRECT))
	110	ioflags \|= IO_ISDIRECT;
	111
	112	VOP_WRITE(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval);
	113	return rval;
	114	}
	115
	116
	117	STATIC ssize_t
3562fd45	118	xfs_file_aio_write(
1da177e4 LT	119	struct kiocb *iocb,
	120	const char __user *buf,
	121	size_t count,
	122	loff_t pos)
	123	{
3562fd45	124	return __xfs_file_write(iocb, buf, IO_ISAIO, count, pos);
1da177e4 LT	125	}
	126
	127	STATIC ssize_t
3562fd45	128	xfs_file_aio_write_invis(
1da177e4 LT	129	struct kiocb *iocb,
	130	const char __user *buf,
	131	size_t count,
	132	loff_t pos)
	133	{
3562fd45	134	return __xfs_file_write(iocb, buf, IO_ISAIO\|IO_INVIS, count, pos);
1da177e4 LT	135	}
	136
	137
	138	STATIC inline ssize_t
3562fd45	139	__xfs_file_readv(
1da177e4 LT	140	struct file *file,
	141	const struct iovec *iov,
	142	int ioflags,
	143	unsigned long nr_segs,
	144	loff_t *ppos)
	145	{
	146	struct inode *inode = file->f_mapping->host;
ec86dc02	147	vnode_t *vp = vn_from_inode(inode);
524fbf5d	148	struct kiocb kiocb;
1da177e4 LT	149	ssize_t rval;
1da177e4 LT	150
524fbf5d NS	151	init_sync_kiocb(&kiocb, file);
524fbf5d NS	152	kiocb.ki_pos = *ppos;
1da177e4 LT	153
	154	if (unlikely(file->f_flags & O_DIRECT))
	155	ioflags \|= IO_ISDIRECT;
524fbf5d	156	VOP_READ(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval);
1da177e4	157
524fbf5d	158	*ppos = kiocb.ki_pos;
1da177e4 LT	159	return rval;
	160	}
	161
	162	STATIC ssize_t
3562fd45	163	xfs_file_readv(
1da177e4 LT	164	struct file *file,
	165	const struct iovec *iov,
	166	unsigned long nr_segs,
	167	loff_t *ppos)
	168	{
3562fd45	169	return __xfs_file_readv(file, iov, 0, nr_segs, ppos);
1da177e4 LT	170	}
	171
	172	STATIC ssize_t
3562fd45	173	xfs_file_readv_invis(
1da177e4 LT	174	struct file *file,
	175	const struct iovec *iov,
	176	unsigned long nr_segs,
	177	loff_t *ppos)
	178	{
3562fd45	179	return __xfs_file_readv(file, iov, IO_INVIS, nr_segs, ppos);
1da177e4 LT	180	}
	181
	182
	183	STATIC inline ssize_t
3562fd45	184	__xfs_file_writev(
1da177e4 LT	185	struct file *file,
	186	const struct iovec *iov,
	187	int ioflags,
	188	unsigned long nr_segs,
	189	loff_t *ppos)
	190	{
	191	struct inode *inode = file->f_mapping->host;
ec86dc02	192	vnode_t *vp = vn_from_inode(inode);
524fbf5d	193	struct kiocb kiocb;
1da177e4 LT	194	ssize_t rval;
1da177e4 LT	195
524fbf5d NS	196	init_sync_kiocb(&kiocb, file);
524fbf5d NS	197	kiocb.ki_pos = *ppos;
1da177e4 LT	198	if (unlikely(file->f_flags & O_DIRECT))
	199	ioflags \|= IO_ISDIRECT;
	200
524fbf5d	201	VOP_WRITE(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval);
1da177e4	202
524fbf5d	203	*ppos = kiocb.ki_pos;
1da177e4 LT	204	return rval;
	205	}
	206
	207
	208	STATIC ssize_t
3562fd45	209	xfs_file_writev(
1da177e4 LT	210	struct file *file,
	211	const struct iovec *iov,
	212	unsigned long nr_segs,
	213	loff_t *ppos)
	214	{
3562fd45	215	return __xfs_file_writev(file, iov, 0, nr_segs, ppos);
1da177e4 LT	216	}
	217
	218	STATIC ssize_t
3562fd45	219	xfs_file_writev_invis(
1da177e4 LT	220	struct file *file,
	221	const struct iovec *iov,
	222	unsigned long nr_segs,
	223	loff_t *ppos)
	224	{
3562fd45	225	return __xfs_file_writev(file, iov, IO_INVIS, nr_segs, ppos);
1da177e4 LT	226	}
	227
	228	STATIC ssize_t
3562fd45	229	xfs_file_sendfile(
1da177e4 LT	230	struct file *filp,
	231	loff_t *ppos,
	232	size_t count,
	233	read_actor_t actor,
	234	void *target)
	235	{
ec86dc02	236	vnode_t *vp = vn_from_inode(filp->f_dentry->d_inode);
1da177e4 LT	237	ssize_t rval;
	238
	239	VOP_SENDFILE(vp, filp, ppos, 0, count, actor, target, NULL, rval);
	240	return rval;
	241	}
	242
	243
	244	STATIC int
3562fd45	245	xfs_file_open(
1da177e4 LT	246	struct inode *inode,
	247	struct file *filp)
	248	{
ec86dc02	249	vnode_t *vp = vn_from_inode(inode);
1da177e4 LT	250	int error;
	251
	252	if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
	253	return -EFBIG;
	254
	255	ASSERT(vp);
	256	VOP_OPEN(vp, NULL, error);
	257	return -error;
	258	}
	259
	260
	261	STATIC int
3562fd45	262	xfs_file_release(
1da177e4 LT	263	struct inode *inode,
	264	struct file *filp)
	265	{
ec86dc02	266	vnode_t *vp = vn_from_inode(inode);
1da177e4 LT	267	int error = 0;
	268
	269	if (vp)
	270	VOP_RELEASE(vp, error);
	271	return -error;
	272	}
	273
	274
	275	STATIC int
3562fd45	276	xfs_file_fsync(
1da177e4 LT	277	struct file *filp,
	278	struct dentry *dentry,
	279	int datasync)
	280	{
	281	struct inode *inode = dentry->d_inode;
ec86dc02	282	vnode_t *vp = vn_from_inode(inode);
1da177e4 LT	283	int error;
	284	int flags = FSYNC_WAIT;
	285
	286	if (datasync)
	287	flags \|= FSYNC_DATA;
	288
	289	ASSERT(vp);
	290	VOP_FSYNC(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1, error);
	291	return -error;
	292	}
	293
	294	/*
3562fd45	295	* xfs_file_readdir maps to VOP_READDIR().
1da177e4 LT	296	* We need to build a uio, cred, ...
	297	*/
	298
	299	#define nextdp(dp) ((struct xfs_dirent )((char )(dp) + (dp)->d_reclen))
	300
bb3f724e DR	301	#ifdef CONFIG_XFS_DMAPI
	302
	303	STATIC struct page *
3562fd45	304	xfs_vm_nopage(
bb3f724e DR	305	struct vm_area_struct *area,
	306	unsigned long address,
	307	int *type)
	308	{
	309	struct inode *inode = area->vm_file->f_dentry->d_inode;
ec86dc02	310	vnode_t *vp = vn_from_inode(inode);
bb3f724e DR	311	xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
	312	int error;
	313
	314	ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI);
	315
	316	error = XFS_SEND_MMAP(mp, area, 0);
	317	if (error)
	318	return NULL;
	319
	320	return filemap_nopage(area, address, type);
	321	}
	322
	323	#endif /* CONFIG_XFS_DMAPI */
	324
	325
1da177e4	326	STATIC int
3562fd45	327	xfs_file_readdir(
1da177e4 LT	328	struct file *filp,
	329	void *dirent,
	330	filldir_t filldir)
	331	{
	332	int error = 0;
	333	vnode_t *vp;
	334	uio_t uio;
	335	iovec_t iov;
	336	int eof = 0;
	337	caddr_t read_buf;
	338	int namelen, size = 0;
	339	size_t rlen = PAGE_CACHE_SIZE;
	340	xfs_off_t start_offset, curr_offset;
	341	xfs_dirent_t *dbp = NULL;
	342
ec86dc02	343	vp = vn_from_inode(filp->f_dentry->d_inode);
1da177e4 LT	344	ASSERT(vp);
	345
	346	/* Try fairly hard to get memory */
	347	do {
	348	if ((read_buf = (caddr_t)kmalloc(rlen, GFP_KERNEL)))
	349	break;
	350	rlen >>= 1;
	351	} while (rlen >= 1024);
	352
	353	if (read_buf == NULL)
	354	return -ENOMEM;
	355
	356	uio.uio_iov = &iov;
	357	uio.uio_segflg = UIO_SYSSPACE;
	358	curr_offset = filp->f_pos;
	359	if (filp->f_pos != 0x7fffffff)
	360	uio.uio_offset = filp->f_pos;
	361	else
	362	uio.uio_offset = 0xffffffff;
	363
	364	while (!eof) {
	365	uio.uio_resid = iov.iov_len = rlen;
	366	iov.iov_base = read_buf;
	367	uio.uio_iovcnt = 1;
	368
	369	start_offset = uio.uio_offset;
	370
	371	VOP_READDIR(vp, &uio, NULL, &eof, error);
	372	if ((uio.uio_offset == start_offset) \|\| error) {
	373	size = 0;
	374	break;
	375	}
	376
	377	size = rlen - uio.uio_resid;
	378	dbp = (xfs_dirent_t *)read_buf;
	379	while (size > 0) {
	380	namelen = strlen(dbp->d_name);
	381
	382	if (filldir(dirent, dbp->d_name, namelen,
	383	(loff_t) curr_offset & 0x7fffffff,
	384	(ino_t) dbp->d_ino,
	385	DT_UNKNOWN)) {
	386	goto done;
	387	}
	388	size -= dbp->d_reclen;
	389	curr_offset = (loff_t)dbp->d_off /* & 0x7fffffff */;
	390	dbp = nextdp(dbp);
	391	}
	392	}
	393	done:
	394	if (!error) {
	395	if (size == 0)
	396	filp->f_pos = uio.uio_offset & 0x7fffffff;
	397	else if (dbp)
	398	filp->f_pos = curr_offset;
	399	}
	400
	401	kfree(read_buf);
	402	return -error;
	403	}
	404
	405
	406	STATIC int
3562fd45	407	xfs_file_mmap(
1da177e4 LT	408	struct file *filp,
	409	struct vm_area_struct *vma)
	410	{
	411	struct inode *ip = filp->f_dentry->d_inode;
ec86dc02	412	vnode_t *vp = vn_from_inode(ip);
524fbf5d	413	vattr_t vattr;
1da177e4 LT	414	int error;
1da177e4 LT	415
3562fd45	416	vma->vm_ops = &xfs_file_vm_ops;
6fac0cb4	417
6fac0cb4	418	#ifdef CONFIG_XFS_DMAPI
bb3f724e	419	if (vp->v_vfsp->vfs_flag & VFS_DMI) {
3562fd45	420	vma->vm_ops = &xfs_dmapi_file_vm_ops;
1da177e4	421	}
bb3f724e	422	#endif /* CONFIG_XFS_DMAPI */
1da177e4	423
524fbf5d NS	424	vattr.va_mask = XFS_AT_UPDATIME;
524fbf5d NS	425	VOP_SETATTR(vp, &vattr, XFS_AT_UPDATIME, NULL, error);
220b5284	426	if (likely(!error))
524fbf5d	427	__vn_revalidate(vp, &vattr); /* update flags */
1da177e4 LT	428	return 0;
	429	}
	430
	431
	432	STATIC long
3562fd45	433	xfs_file_ioctl(
1da177e4 LT	434	struct file *filp,
	435	unsigned int cmd,
	436	unsigned long arg)
	437	{
	438	int error;
1f6553f9	439	struct inode *inode = filp->f_dentry->d_inode;
ec86dc02	440	vnode_t *vp = vn_from_inode(inode);
1da177e4 LT	441
	442	VOP_IOCTL(vp, inode, filp, 0, cmd, (void __user *)arg, error);
	443	VMODIFY(vp);
	444
	445	/* NOTE: some of the ioctl's return positive #'s as a
	446	* byte count indicating success, such as
	447	* readlink_by_handle. So we don't "sign flip"
	448	* like most other routines. This means true
	449	* errors need to be returned as a negative value.
	450	*/
	451	return error;
	452	}
	453
	454	STATIC long
3562fd45	455	xfs_file_ioctl_invis(
1da177e4 LT	456	struct file *filp,
	457	unsigned int cmd,
	458	unsigned long arg)
	459	{
	460	int error;
1f6553f9	461	struct inode *inode = filp->f_dentry->d_inode;
ec86dc02	462	vnode_t *vp = vn_from_inode(inode);
1da177e4 LT	463
	464	ASSERT(vp);
	465	VOP_IOCTL(vp, inode, filp, IO_INVIS, cmd, (void __user *)arg, error);
	466	VMODIFY(vp);
	467
	468	/* NOTE: some of the ioctl's return positive #'s as a
	469	* byte count indicating success, such as
	470	* readlink_by_handle. So we don't "sign flip"
	471	* like most other routines. This means true
	472	* errors need to be returned as a negative value.
	473	*/
	474	return error;
	475	}
	476
bb3f724e	477	#ifdef CONFIG_XFS_DMAPI
1da177e4 LT	478	#ifdef HAVE_VMOP_MPROTECT
1da177e4 LT	479	STATIC int
3562fd45	480	xfs_vm_mprotect(
1da177e4 LT	481	struct vm_area_struct *vma,
	482	unsigned int newflags)
	483	{
ec86dc02	484	vnode_t *vp = vn_from_inode(vma->vm_file->f_dentry->d_inode);
1da177e4 LT	485	int error = 0;
	486
	487	if (vp->v_vfsp->vfs_flag & VFS_DMI) {
	488	if ((vma->vm_flags & VM_MAYSHARE) &&
	489	(newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE)) {
	490	xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
	491
	492	error = XFS_SEND_MMAP(mp, vma, VM_WRITE);
	493	}
	494	}
	495	return error;
	496	}
	497	#endif /* HAVE_VMOP_MPROTECT */
bb3f724e	498	#endif /* CONFIG_XFS_DMAPI */
1da177e4 LT	499
	500	#ifdef HAVE_FOP_OPEN_EXEC
	501	/* If the user is attempting to execute a file that is offline then
	502	* we have to trigger a DMAPI READ event before the file is marked as busy
	503	* otherwise the invisible I/O will not be able to write to the file to bring
	504	* it back online.
	505	*/
	506	STATIC int
3562fd45	507	xfs_file_open_exec(
1da177e4 LT	508	struct inode *inode)
1da177e4 LT	509	{
ec86dc02	510	vnode_t *vp = vn_from_inode(inode);
1da177e4 LT	511	xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
1da177e4 LT	512	int error = 0;
1da177e4 LT	513	xfs_inode_t *ip;
	514
	515	if (vp->v_vfsp->vfs_flag & VFS_DMI) {
75e17b3c CH	516	ip = xfs_vtoi(vp);
75e17b3c CH	517	if (!ip) {
1da177e4 LT	518	error = -EINVAL;
	519	goto open_exec_out;
	520	}
1da177e4 LT	521	if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)) {
	522	error = -XFS_SEND_DATA(mp, DM_EVENT_READ, vp,
	523	0, 0, 0, NULL);
	524	}
	525	}
	526	open_exec_out:
	527	return error;
	528	}
	529	#endif /* HAVE_FOP_OPEN_EXEC */
	530
4b6f5d20	531	const struct file_operations xfs_file_operations = {
1da177e4 LT	532	.llseek = generic_file_llseek,
1da177e4 LT	533	.read = do_sync_read,
bb3f724e	534	.write = do_sync_write,
3562fd45 NS	535	.readv = xfs_file_readv,
	536	.writev = xfs_file_writev,
	537	.aio_read = xfs_file_aio_read,
	538	.aio_write = xfs_file_aio_write,
	539	.sendfile = xfs_file_sendfile,
	540	.unlocked_ioctl = xfs_file_ioctl,
1da177e4	541	#ifdef CONFIG_COMPAT
3562fd45	542	.compat_ioctl = xfs_file_compat_ioctl,
1da177e4	543	#endif
3562fd45 NS	544	.mmap = xfs_file_mmap,
	545	.open = xfs_file_open,
	546	.release = xfs_file_release,
	547	.fsync = xfs_file_fsync,
1da177e4	548	#ifdef HAVE_FOP_OPEN_EXEC
3562fd45	549	.open_exec = xfs_file_open_exec,
1da177e4 LT	550	#endif
	551	};
	552
4b6f5d20	553	const struct file_operations xfs_invis_file_operations = {
1da177e4 LT	554	.llseek = generic_file_llseek,
1da177e4 LT	555	.read = do_sync_read,
bb3f724e	556	.write = do_sync_write,
3562fd45 NS	557	.readv = xfs_file_readv_invis,
	558	.writev = xfs_file_writev_invis,
	559	.aio_read = xfs_file_aio_read_invis,
	560	.aio_write = xfs_file_aio_write_invis,
	561	.sendfile = xfs_file_sendfile,
	562	.unlocked_ioctl = xfs_file_ioctl_invis,
1da177e4	563	#ifdef CONFIG_COMPAT
3562fd45	564	.compat_ioctl = xfs_file_compat_invis_ioctl,
1da177e4	565	#endif
3562fd45 NS	566	.mmap = xfs_file_mmap,
	567	.open = xfs_file_open,
	568	.release = xfs_file_release,
	569	.fsync = xfs_file_fsync,
1da177e4 LT	570	};
	571
	572
4b6f5d20	573	const struct file_operations xfs_dir_file_operations = {
1da177e4	574	.read = generic_read_dir,
3562fd45 NS	575	.readdir = xfs_file_readdir,
3562fd45 NS	576	.unlocked_ioctl = xfs_file_ioctl,
d3870398	577	#ifdef CONFIG_COMPAT
3562fd45	578	.compat_ioctl = xfs_file_compat_ioctl,
d3870398	579	#endif
3562fd45	580	.fsync = xfs_file_fsync,
1da177e4 LT	581	};
1da177e4 LT	582
3562fd45	583	static struct vm_operations_struct xfs_file_vm_ops = {
1da177e4 LT	584	.nopage = filemap_nopage,
1da177e4 LT	585	.populate = filemap_populate,
6fac0cb4 DR	586	};
	587
	588	#ifdef CONFIG_XFS_DMAPI
3562fd45 NS	589	static struct vm_operations_struct xfs_dmapi_file_vm_ops = {
3562fd45 NS	590	.nopage = xfs_vm_nopage,
6fac0cb4	591	.populate = filemap_populate,
1da177e4	592	#ifdef HAVE_VMOP_MPROTECT
3562fd45	593	.mprotect = xfs_vm_mprotect,
1da177e4 LT	594	#endif
1da177e4 LT	595	};
6fac0cb4	596	#endif /* CONFIG_XFS_DMAPI */