/* * Copyright (c) 2000-2004 Silicon Graphics, Inc.  All Rights Reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 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. * * Further, this software is distributed without any warranty that it is * free of the rightful claim of any third person regarding infringement * or the like.  Any license provided herein, whether implied or * otherwise, applies only to this software file.  Patent licenses, if * any, provided herein do not apply to combinations of this program with * other software, or any other product whatsoever. * * You should have received a copy of the GNU General Public License along * with this program; if not, write the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston MA 02111-1307, USA. * * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, * Mountain View, CA  94043, or: * * http://www.sgi.com * * For further information regarding this notice, see: * * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ */#include "xfs.h"#include "xfs_inum.h"#include "xfs_log.h"#include "xfs_sb.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 <linux/dcache.h>#include <linux/smp_lock.h>static struct vm_operations_struct linvfs_file_vm_ops;STATIC inline ssize_t__linvfs_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 = LINVFS_GET_VP(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_tlinvfs_read(	struct kiocb		*iocb,	char __user		*buf,	size_t			count,	loff_t			pos){	return __linvfs_read(iocb, buf, 0, count, pos);}STATIC ssize_tlinvfs_read_invis(	struct kiocb		*iocb,	char __user		*buf,	size_t			count,	loff_t			pos){	return __linvfs_read(iocb, buf, IO_INVIS, count, pos);}STATIC inline ssize_t__linvfs_write(	struct kiocb	*iocb,	const char 	*buf,	int		ioflags,	size_t		count,	loff_t		pos){	struct iovec	iov = {(void *)buf, count};	struct file	*file = iocb->ki_filp;	struct inode	*inode = file->f_mapping->host;	vnode_t		*vp = LINVFS_GET_VP(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);	} else {		down(&inode->i_sem);		VOP_WRITE(vp, iocb, &iov, 1, &iocb->ki_pos,				ioflags, NULL, rval);		up(&inode->i_sem);	}	return rval;}STATIC ssize_tlinvfs_write(	struct kiocb		*iocb,	const char __user	*buf,	size_t			count,	loff_t			pos){	return __linvfs_write(iocb, buf, 0, count, pos);}STATIC ssize_tlinvfs_write_invis(	struct kiocb		*iocb,	const char __user	*buf,	size_t			count,	loff_t			pos){	return __linvfs_write(iocb, buf, IO_INVIS, count, pos);}STATIC inline ssize_t__linvfs_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 = LINVFS_GET_VP(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);	if (rval == -EIOCBQUEUED)		rval = wait_on_sync_kiocb(&kiocb);	*ppos = kiocb.ki_pos;	return rval;}STATIC ssize_tlinvfs_readv(	struct file		*file,	const struct iovec 	*iov,	unsigned long		nr_segs,	loff_t			*ppos){	return __linvfs_readv(file, iov, 0, nr_segs, ppos);}STATIC ssize_tlinvfs_readv_invis(	struct file		*file,	const struct iovec 	*iov,	unsigned long		nr_segs,	loff_t			*ppos){	return __linvfs_readv(file, iov, IO_INVIS, nr_segs, ppos);}STATIC inline ssize_t__linvfs_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 = LINVFS_GET_VP(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);	} else {		down(&inode->i_sem);		VOP_WRITE(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos,				ioflags, NULL, rval);		up(&inode->i_sem);	}	if (rval == -EIOCBQUEUED)		rval = wait_on_sync_kiocb(&kiocb);	*ppos = kiocb.ki_pos;	return rval;}STATIC ssize_tlinvfs_writev(	struct file		*file,	const struct iovec 	*iov,	unsigned long		nr_segs,	loff_t			*ppos){	return __linvfs_writev(file, iov, 0, nr_segs, ppos);}STATIC ssize_tlinvfs_writev_invis(	struct file		*file,	const struct iovec 	*iov,	unsigned long		nr_segs,	loff_t			*ppos){	return __linvfs_writev(file, iov, IO_INVIS, nr_segs, ppos);}STATIC ssize_tlinvfs_sendfile(	struct file		*filp,	loff_t			*ppos,	size_t			count,	read_actor_t		actor,	void			*target){	vnode_t			*vp = LINVFS_GET_VP(filp->f_dentry->d_inode);	ssize_t			rval;	VOP_SENDFILE(vp, filp, ppos, 0, count, actor, target, NULL, rval);	return rval;}STATIC intlinvfs_open(	struct inode	*inode,	struct file	*filp){	vnode_t		*vp = LINVFS_GET_VP(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 intlinvfs_release(	struct inode	*inode,	struct file	*filp){	vnode_t		*vp = LINVFS_GET_VP(inode);	int		error = 0;	if (vp)		VOP_RELEASE(vp, error);	return -error;}STATIC intlinvfs_fsync(	struct file	*filp,	struct dentry	*dentry,	int		datasync){	struct inode	*inode = dentry->d_inode;	vnode_t		*vp = LINVFS_GET_VP(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;}/* * linvfs_readdir maps to VOP_READDIR(). * We need to build a uio, cred, ... */#define nextdp(dp)      ((struct xfs_dirent *)((char *)(dp) + (dp)->d_reclen))STATIC intlinvfs_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 = LINVFS_GET_VP(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 intlinvfs_file_mmap(	struct file	*filp,	struct vm_area_struct *vma){	struct inode	*ip = filp->f_dentry->d_inode;	vnode_t		*vp = LINVFS_GET_VP(ip);	vattr_t		va = { .va_mask = XFS_AT_UPDATIME };	int		error;	if ((vp->v_type == VREG) && (vp->v_vfsp->vfs_flag & VFS_DMI)) {		xfs_mount_t	*mp = XFS_VFSTOM(vp->v_vfsp);		error = -XFS_SEND_MMAP(mp, vma, 0);		if (error)			return error;	}	vma->vm_ops = &linvfs_file_vm_ops;	VOP_SETATTR(vp, &va, XFS_AT_UPDATIME, NULL, error);	return 0;}STATIC intlinvfs_ioctl(	struct inode	*inode,	struct file	*filp,	unsigned int	cmd,	unsigned long	arg){	int		error;	vnode_t		*vp = LINVFS_GET_VP(inode);	unlock_kernel();	VOP_IOCTL(vp, inode, filp, 0, cmd, arg, error);	VMODIFY(vp);	lock_kernel();	/* 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 intlinvfs_ioctl_invis(	struct inode	*inode,	struct file	*filp,	unsigned int	cmd,	unsigned long	arg){	int		error;	vnode_t		*vp = LINVFS_GET_VP(inode);	unlock_kernel();	ASSERT(vp);	VOP_IOCTL(vp, inode, filp, IO_INVIS, cmd, arg, error);	VMODIFY(vp);	lock_kernel();	/* NOTE:  some of the ioctl's return positive #'s as a	 *	  byte count indicating success, such as	 *	  readlink_by_handle.  So we don't "sign flip"	 *	  like most other routines.  This means true	 *	  errors need to be returned as a negative value.	 */	return error;}#ifdef HAVE_VMOP_MPROTECTSTATIC intlinvfs_mprotect(	struct vm_area_struct *vma,	unsigned int	newflags){	vnode_t		*vp = LINVFS_GET_VP(vma->vm_file->f_dentry->d_inode);	int		error = 0;	if ((vp->v_type == VREG) && (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 */struct file_operations linvfs_file_operations = {	.llseek		= generic_file_llseek,	.read		= do_sync_read,	.write		= do_sync_write,	.readv		= linvfs_readv,	.writev		= linvfs_writev,	.aio_read	= linvfs_read,	.aio_write	= linvfs_write,	.sendfile	= linvfs_sendfile,	.ioctl		= linvfs_ioctl,	.mmap		= linvfs_file_mmap,	.open		= linvfs_open,	.release	= linvfs_release,	.fsync		= linvfs_fsync,};struct file_operations linvfs_invis_file_operations = {	.llseek		= generic_file_llseek,	.read		= do_sync_read,	.write		= do_sync_write,	.readv		= linvfs_readv_invis,	.writev		= linvfs_writev_invis,	.aio_read	= linvfs_read_invis,	.aio_write	= linvfs_write_invis,	.sendfile	= linvfs_sendfile,	.ioctl		= linvfs_ioctl_invis,	.mmap		= linvfs_file_mmap,	.open		= linvfs_open,	.release	= linvfs_release,	.fsync		= linvfs_fsync,};struct file_operations linvfs_dir_operations = {	.read		= generic_read_dir,	.readdir	= linvfs_readdir,	.ioctl		= linvfs_ioctl,	.fsync		= linvfs_fsync,};static struct vm_operations_struct linvfs_file_vm_ops = {	.nopage		= filemap_nopage,#ifdef HAVE_VMOP_MPROTECT	.mprotect	= linvfs_mprotect,#endif};