fs/xfs/linux-2.6/xfs_iops.c - kernel/msm-4.19 - Gitiles

 /*
  * 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_fs.h"
 #include "xfs_inum.h"
 #include "xfs_log.h"
 #include "xfs_trans.h"
 #include "xfs_sb.h"
 #include "xfs_ag.h"
 #include "xfs_dir.h"
 #include "xfs_dir2.h"
 #include "xfs_alloc.h"
 #include "xfs_dmapi.h"
 #include "xfs_quota.h"
 #include "xfs_mount.h"
 #include "xfs_alloc_btree.h"
 #include "xfs_bmap_btree.h"
 #include "xfs_ialloc_btree.h"
 #include "xfs_btree.h"
 #include "xfs_ialloc.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_bmap.h"
 #include "xfs_bit.h"
 #include "xfs_rtalloc.h"
 #include "xfs_error.h"
 #include "xfs_itable.h"
 #include "xfs_rw.h"
 #include "xfs_acl.h"
 #include "xfs_cap.h"
 #include "xfs_mac.h"
 #include "xfs_attr.h"
 #include "xfs_buf_item.h"
 #include "xfs_utils.h"

 #include <linux/xattr.h>
 #include <linux/namei.h>


 /*
  * Pull the link count and size up from the xfs inode to the linux inode
  */
 STATIC void
 validate_fields(
 	struct inode	*ip)
 {
 	vnode_t		*vp = LINVFS_GET_VP(ip);
 	vattr_t		va;
 	int		error;

 	va.va_mask = XFS_AT_NLINK|XFS_AT_SIZE|XFS_AT_NBLOCKS;
 	VOP_GETATTR(vp, &va, ATTR_LAZY, NULL, error);
 	if (likely(!error)) {
 		ip->i_nlink = va.va_nlink;
 		ip->i_blocks = va.va_nblocks;

 		/* we're under i_sem so i_size can't change under us */
 		if (i_size_read(ip) != va.va_size)
 			i_size_write(ip, va.va_size);
 	}
 }

 /*
  * Determine whether a process has a valid fs_struct (kernel daemons
  * like knfsd don't have an fs_struct).
  *
  * XXX(hch):  nfsd is broken, better fix it instead.
  */
 STATIC inline int
 has_fs_struct(struct task_struct *task)
 {
 	return (task->fs != init_task.fs);
 }

 STATIC int
 linvfs_mknod(
 	struct inode	*dir,
 	struct dentry	*dentry,
 	int		mode,
 	dev_t		rdev)
 {
 	struct inode	*ip;
 	vattr_t		va;
 	vnode_t		*vp = NULL, *dvp = LINVFS_GET_VP(dir);
 	xfs_acl_t	*default_acl = NULL;
 	attrexists_t	test_default_acl = _ACL_DEFAULT_EXISTS;
 	int		error;

 	/*
 	 * Irix uses Missed'em'V split, but doesn't want to see
 	 * the upper 5 bits of (14bit) major.
 	 */
 	if (!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff)
 		return -EINVAL;

 	if (test_default_acl && test_default_acl(dvp)) {
 		if (!_ACL_ALLOC(default_acl))
 			return -ENOMEM;
 		if (!_ACL_GET_DEFAULT(dvp, default_acl)) {
 			_ACL_FREE(default_acl);
 			default_acl = NULL;
 		}
 	}

 	if (IS_POSIXACL(dir) && !default_acl && has_fs_struct(current))
 		mode &= ~current->fs->umask;

 	memset(&va, 0, sizeof(va));
 	va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;
 	va.va_mode = mode;

 	switch (mode & S_IFMT) {
 	case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
 		va.va_rdev = sysv_encode_dev(rdev);
 		va.va_mask |= XFS_AT_RDEV;
 		/*FALLTHROUGH*/
 	case S_IFREG:
 		VOP_CREATE(dvp, dentry, &va, &vp, NULL, error);
 		break;
 	case S_IFDIR:
 		VOP_MKDIR(dvp, dentry, &va, &vp, NULL, error);
 		break;
 	default:
 		error = EINVAL;
 		break;
 	}

 	if (default_acl) {
 		if (!error) {
 			error = _ACL_INHERIT(vp, &va, default_acl);
 			if (!error) {
 				VMODIFY(vp);
 			} else {
 				struct dentry	teardown = {};
 				int		err2;

 				/* Oh, the horror.
 				 * If we can't add the ACL we must back out.
 				 * ENOSPC can hit here, among other things.
 				 */
 				teardown.d_inode = ip = LINVFS_GET_IP(vp);
 				teardown.d_name = dentry->d_name;

 				vn_mark_bad(vp);

 				if (S_ISDIR(mode))
 					VOP_RMDIR(dvp, &teardown, NULL, err2);
 				else
 					VOP_REMOVE(dvp, &teardown, NULL, err2);
 				VN_RELE(vp);
 			}
 		}
 		_ACL_FREE(default_acl);
 	}

 	if (!error) {
 		ASSERT(vp);
 		ip = LINVFS_GET_IP(vp);

 		if (S_ISCHR(mode) || S_ISBLK(mode))
 			ip->i_rdev = rdev;
 		else if (S_ISDIR(mode))
 			validate_fields(ip);
 		d_instantiate(dentry, ip);
 		validate_fields(dir);
 	}
 	return -error;
 }

 STATIC int
 linvfs_create(
 	struct inode	*dir,
 	struct dentry	*dentry,
 	int		mode,
 	struct nameidata *nd)
 {
 	return linvfs_mknod(dir, dentry, mode, 0);
 }

 STATIC int
 linvfs_mkdir(
 	struct inode	*dir,
 	struct dentry	*dentry,
 	int		mode)
 {
 	return linvfs_mknod(dir, dentry, mode|S_IFDIR, 0);
 }

 STATIC struct dentry *
 linvfs_lookup(
 	struct inode	*dir,
 	struct dentry	*dentry,
 	struct nameidata *nd)
 {
 	struct vnode	*vp = LINVFS_GET_VP(dir), *cvp;
 	int		error;

 	if (dentry->d_name.len >= MAXNAMELEN)
 		return ERR_PTR(-ENAMETOOLONG);

 	VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error);
 	if (error) {
 		if (unlikely(error != ENOENT))
 			return ERR_PTR(-error);
 		d_add(dentry, NULL);
 		return NULL;
 	}

 	return d_splice_alias(LINVFS_GET_IP(cvp), dentry);
 }

 STATIC int
 linvfs_link(
 	struct dentry	*old_dentry,
 	struct inode	*dir,
 	struct dentry	*dentry)
 {
 	struct inode	*ip;	/* inode of guy being linked to */
 	vnode_t		*tdvp;	/* target directory for new name/link */
 	vnode_t		*vp;	/* vp of name being linked */
 	int		error;

 	ip = old_dentry->d_inode;	/* inode being linked to */
 	if (S_ISDIR(ip->i_mode))
 		return -EPERM;

 	tdvp = LINVFS_GET_VP(dir);
 	vp = LINVFS_GET_VP(ip);

 	VOP_LINK(tdvp, vp, dentry, NULL, error);
 	if (!error) {
 		VMODIFY(tdvp);
 		VN_HOLD(vp);
 		validate_fields(ip);
 		d_instantiate(dentry, ip);
 	}
 	return -error;
 }

 STATIC int
 linvfs_unlink(
 	struct inode	*dir,
 	struct dentry	*dentry)
 {
 	struct inode	*inode;
 	vnode_t		*dvp;	/* directory containing name to remove */
 	int		error;

 	inode = dentry->d_inode;
 	dvp = LINVFS_GET_VP(dir);

 	VOP_REMOVE(dvp, dentry, NULL, error);
 	if (!error) {
 		validate_fields(dir);	/* For size only */
 		validate_fields(inode);
 	}

 	return -error;
 }

 STATIC int
 linvfs_symlink(
 	struct inode	*dir,
 	struct dentry	*dentry,
 	const char	*symname)
 {
 	struct inode	*ip;
 	vattr_t		va;
 	vnode_t		*dvp;	/* directory containing name of symlink */
 	vnode_t		*cvp;	/* used to lookup symlink to put in dentry */
 	int		error;

 	dvp = LINVFS_GET_VP(dir);
 	cvp = NULL;

 	memset(&va, 0, sizeof(va));
 	va.va_mode = S_IFLNK |
 		(irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO);
 	va.va_mask = XFS_AT_TYPE|XFS_AT_MODE;

 	error = 0;
 	VOP_SYMLINK(dvp, dentry, &va, (char *)symname, &cvp, NULL, error);
 	if (!error && cvp) {
 		ip = LINVFS_GET_IP(cvp);
 		d_instantiate(dentry, ip);
 		validate_fields(dir);
 		validate_fields(ip); /* size needs update */
 	}
 	return -error;
 }

 STATIC int
 linvfs_rmdir(
 	struct inode	*dir,
 	struct dentry	*dentry)
 {
 	struct inode	*inode = dentry->d_inode;
 	vnode_t		*dvp = LINVFS_GET_VP(dir);
 	int		error;

 	VOP_RMDIR(dvp, dentry, NULL, error);
 	if (!error) {
 		validate_fields(inode);
 		validate_fields(dir);
 	}
 	return -error;
 }

 STATIC int
 linvfs_rename(
 	struct inode	*odir,
 	struct dentry	*odentry,
 	struct inode	*ndir,
 	struct dentry	*ndentry)
 {
 	struct inode	*new_inode = ndentry->d_inode;
 	vnode_t		*fvp;	/* from directory */
 	vnode_t		*tvp;	/* target directory */
 	int		error;

 	fvp = LINVFS_GET_VP(odir);
 	tvp = LINVFS_GET_VP(ndir);

 	VOP_RENAME(fvp, odentry, tvp, ndentry, NULL, error);
 	if (error)
 		return -error;

 	if (new_inode)
 		validate_fields(new_inode);

 	validate_fields(odir);
 	if (ndir != odir)
 		validate_fields(ndir);
 	return 0;
 }

 /*
  * careful here - this function can get called recursively, so
  * we need to be very careful about how much stack we use.
  * uio is kmalloced for this reason...
  */
 STATIC void *
 linvfs_follow_link(
 	struct dentry		*dentry,
 	struct nameidata	*nd)
 {
 	vnode_t			*vp;
 	uio_t			*uio;
 	iovec_t			iov;
 	int			error;
 	char			*link;

 	ASSERT(dentry);
 	ASSERT(nd);

 	link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL);
 	if (!link) {
 		nd_set_link(nd, ERR_PTR(-ENOMEM));
 		return NULL;
 	}

 	uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
 	if (!uio) {
 		kfree(link);
 		nd_set_link(nd, ERR_PTR(-ENOMEM));
 		return NULL;
 	}

 	vp = LINVFS_GET_VP(dentry->d_inode);

 	iov.iov_base = link;
 	iov.iov_len = MAXNAMELEN;

 	uio->uio_iov = &iov;
 	uio->uio_offset = 0;
 	uio->uio_segflg = UIO_SYSSPACE;
 	uio->uio_resid = MAXNAMELEN;
 	uio->uio_iovcnt = 1;

 	VOP_READLINK(vp, uio, 0, NULL, error);
 	if (error) {
 		kfree(link);
 		link = ERR_PTR(-error);
 	} else {
 		link[MAXNAMELEN - uio->uio_resid] = '\0';
 	}
 	kfree(uio);

 	nd_set_link(nd, link);
 	return NULL;
 }

 static void linvfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
 {
 	char *s = nd_get_link(nd);
 	if (!IS_ERR(s))
 		kfree(s);
 }

 #ifdef CONFIG_XFS_POSIX_ACL
 STATIC int
 linvfs_permission(
 	struct inode	*inode,
 	int		mode,
 	struct nameidata *nd)
 {
 	vnode_t		*vp = LINVFS_GET_VP(inode);
 	int		error;

 	mode <<= 6;		/* convert from linux to vnode access bits */
 	VOP_ACCESS(vp, mode, NULL, error);
 	return -error;
 }
 #else
 #define linvfs_permission NULL
 #endif

 STATIC int
 linvfs_getattr(
 	struct vfsmount	*mnt,
 	struct dentry	*dentry,
 	struct kstat	*stat)
 {
 	struct inode	*inode = dentry->d_inode;
 	vnode_t		*vp = LINVFS_GET_VP(inode);
 	int		error = 0;

 	if (unlikely(vp->v_flag & VMODIFIED))
 		error = vn_revalidate(vp);
 	if (!error)
 		generic_fillattr(inode, stat);
 	return 0;
 }

 STATIC int
 linvfs_setattr(
 	struct dentry	*dentry,
 	struct iattr	*attr)
 {
 	struct inode	*inode = dentry->d_inode;
 	unsigned int	ia_valid = attr->ia_valid;
 	vnode_t		*vp = LINVFS_GET_VP(inode);
 	vattr_t		vattr;
 	int		flags = 0;
 	int		error;

 	memset(&vattr, 0, sizeof(vattr_t));
 	if (ia_valid & ATTR_UID) {
 		vattr.va_mask |= XFS_AT_UID;
 		vattr.va_uid = attr->ia_uid;
 	}
 	if (ia_valid & ATTR_GID) {
 		vattr.va_mask |= XFS_AT_GID;
 		vattr.va_gid = attr->ia_gid;
 	}
 	if (ia_valid & ATTR_SIZE) {
 		vattr.va_mask |= XFS_AT_SIZE;
 		vattr.va_size = attr->ia_size;
 	}
 	if (ia_valid & ATTR_ATIME) {
 		vattr.va_mask |= XFS_AT_ATIME;
 		vattr.va_atime = attr->ia_atime;
 	}
 	if (ia_valid & ATTR_MTIME) {
 		vattr.va_mask |= XFS_AT_MTIME;
 		vattr.va_mtime = attr->ia_mtime;
 	}
 	if (ia_valid & ATTR_CTIME) {
 		vattr.va_mask |= XFS_AT_CTIME;
 		vattr.va_ctime = attr->ia_ctime;
 	}
 	if (ia_valid & ATTR_MODE) {
 		vattr.va_mask |= XFS_AT_MODE;
 		vattr.va_mode = attr->ia_mode;
 		if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 			inode->i_mode &= ~S_ISGID;
 	}

 	if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET))
 		flags |= ATTR_UTIME;
 #ifdef ATTR_NO_BLOCK
 	if ((ia_valid & ATTR_NO_BLOCK))
 		flags |= ATTR_NONBLOCK;
 #endif

 	VOP_SETATTR(vp, &vattr, flags, NULL, error);
 	if (error)
 		return -error;
 	vn_revalidate(vp);
 	return error;
 }

 STATIC void
 linvfs_truncate(
 	struct inode	*inode)
 {
 	block_truncate_page(inode->i_mapping, inode->i_size, linvfs_get_block);
 }

 STATIC int
 linvfs_setxattr(
 	struct dentry	*dentry,
 	const char	*name,
 	const void	*data,
 	size_t		size,
 	int		flags)
 {
 	vnode_t		*vp = LINVFS_GET_VP(dentry->d_inode);
 	char		*attr = (char *)name;
 	attrnames_t	*namesp;
 	int		xflags = 0;
 	int		error;

 	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 	if (!namesp)
 		return -EOPNOTSUPP;
 	attr += namesp->attr_namelen;
 	error = namesp->attr_capable(vp, NULL);
 	if (error)
 		return error;

 	/* Convert Linux syscall to XFS internal ATTR flags */
 	if (flags & XATTR_CREATE)
 		xflags |= ATTR_CREATE;
 	if (flags & XATTR_REPLACE)
 		xflags |= ATTR_REPLACE;
 	xflags |= namesp->attr_flag;
 	return namesp->attr_set(vp, attr, (void *)data, size, xflags);
 }

 STATIC ssize_t
 linvfs_getxattr(
 	struct dentry	*dentry,
 	const char	*name,
 	void		*data,
 	size_t		size)
 {
 	vnode_t		*vp = LINVFS_GET_VP(dentry->d_inode);
 	char		*attr = (char *)name;
 	attrnames_t	*namesp;
 	int		xflags = 0;
 	ssize_t		error;

 	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 	if (!namesp)
 		return -EOPNOTSUPP;
 	attr += namesp->attr_namelen;
 	error = namesp->attr_capable(vp, NULL);
 	if (error)
 		return error;

 	/* Convert Linux syscall to XFS internal ATTR flags */
 	if (!size) {
 		xflags |= ATTR_KERNOVAL;
 		data = NULL;
 	}
 	xflags |= namesp->attr_flag;
 	return namesp->attr_get(vp, attr, (void *)data, size, xflags);
 }

 STATIC ssize_t
 linvfs_listxattr(
 	struct dentry		*dentry,
 	char			*data,
 	size_t			size)
 {
 	vnode_t			*vp = LINVFS_GET_VP(dentry->d_inode);
 	int			error, xflags = ATTR_KERNAMELS;
 	ssize_t			result;

 	if (!size)
 		xflags |= ATTR_KERNOVAL;
 	xflags |= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;

 	error = attr_generic_list(vp, data, size, xflags, &result);
 	if (error < 0)
 		return error;
 	return result;
 }

 STATIC int
 linvfs_removexattr(
 	struct dentry	*dentry,
 	const char	*name)
 {
 	vnode_t		*vp = LINVFS_GET_VP(dentry->d_inode);
 	char		*attr = (char *)name;
 	attrnames_t	*namesp;
 	int		xflags = 0;
 	int		error;

 	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
 	if (!namesp)
 		return -EOPNOTSUPP;
 	attr += namesp->attr_namelen;
 	error = namesp->attr_capable(vp, NULL);
 	if (error)
 		return error;
 	xflags |= namesp->attr_flag;
 	return namesp->attr_remove(vp, attr, xflags);
 }


 struct inode_operations linvfs_file_inode_operations = {
 	.permission		= linvfs_permission,
 	.truncate		= linvfs_truncate,
 	.getattr		= linvfs_getattr,
 	.setattr		= linvfs_setattr,
 	.setxattr		= linvfs_setxattr,
 	.getxattr		= linvfs_getxattr,
 	.listxattr		= linvfs_listxattr,
 	.removexattr		= linvfs_removexattr,
 };

 struct inode_operations linvfs_dir_inode_operations = {
 	.create			= linvfs_create,
 	.lookup			= linvfs_lookup,
 	.link			= linvfs_link,
 	.unlink			= linvfs_unlink,
 	.symlink		= linvfs_symlink,
 	.mkdir			= linvfs_mkdir,
 	.rmdir			= linvfs_rmdir,
 	.mknod			= linvfs_mknod,
 	.rename			= linvfs_rename,
 	.permission		= linvfs_permission,
 	.getattr		= linvfs_getattr,
 	.setattr		= linvfs_setattr,
 	.setxattr		= linvfs_setxattr,
 	.getxattr		= linvfs_getxattr,
 	.listxattr		= linvfs_listxattr,
 	.removexattr		= linvfs_removexattr,
 };

 struct inode_operations linvfs_symlink_inode_operations = {
 	.readlink		= generic_readlink,
 	.follow_link		= linvfs_follow_link,
 	.put_link		= linvfs_put_link,
 	.permission		= linvfs_permission,
 	.getattr		= linvfs_getattr,
 	.setattr		= linvfs_setattr,
 	.setxattr		= linvfs_setxattr,
 	.getxattr		= linvfs_getxattr,
 	.listxattr		= linvfs_listxattr,
 	.removexattr		= linvfs_removexattr,
 };
	/*
	* 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_fs.h"
	#include "xfs_inum.h"
	#include "xfs_log.h"
	#include "xfs_trans.h"
	#include "xfs_sb.h"
	#include "xfs_ag.h"
	#include "xfs_dir.h"
	#include "xfs_dir2.h"
	#include "xfs_alloc.h"
	#include "xfs_dmapi.h"
	#include "xfs_quota.h"
	#include "xfs_mount.h"
	#include "xfs_alloc_btree.h"
	#include "xfs_bmap_btree.h"
	#include "xfs_ialloc_btree.h"
	#include "xfs_btree.h"
	#include "xfs_ialloc.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_bmap.h"
	#include "xfs_bit.h"
	#include "xfs_rtalloc.h"
	#include "xfs_error.h"
	#include "xfs_itable.h"
	#include "xfs_rw.h"
	#include "xfs_acl.h"
	#include "xfs_cap.h"
	#include "xfs_mac.h"
	#include "xfs_attr.h"
	#include "xfs_buf_item.h"
	#include "xfs_utils.h"

	#include <linux/xattr.h>
	#include <linux/namei.h>


	/*
	* Pull the link count and size up from the xfs inode to the linux inode
	*/
	STATIC void
	validate_fields(
	struct inode *ip)
	{
	vnode_t *vp = LINVFS_GET_VP(ip);
	vattr_t va;
	int error;

	va.va_mask = XFS_AT_NLINK\|XFS_AT_SIZE\|XFS_AT_NBLOCKS;
	VOP_GETATTR(vp, &va, ATTR_LAZY, NULL, error);
	if (likely(!error)) {
	ip->i_nlink = va.va_nlink;
	ip->i_blocks = va.va_nblocks;

	/* we're under i_sem so i_size can't change under us */
	if (i_size_read(ip) != va.va_size)
	i_size_write(ip, va.va_size);
	}
	}

	/*
	* Determine whether a process has a valid fs_struct (kernel daemons
	* like knfsd don't have an fs_struct).
	*
	* XXX(hch): nfsd is broken, better fix it instead.
	*/
	STATIC inline int
	has_fs_struct(struct task_struct *task)
	{
	return (task->fs != init_task.fs);
	}

	STATIC int
	linvfs_mknod(
	struct inode *dir,
	struct dentry *dentry,
	int mode,
	dev_t rdev)
	{
	struct inode *ip;
	vattr_t va;
	vnode_t vp = NULL, dvp = LINVFS_GET_VP(dir);
	xfs_acl_t *default_acl = NULL;
	attrexists_t test_default_acl = _ACL_DEFAULT_EXISTS;
	int error;

	/*
	* Irix uses Missed'em'V split, but doesn't want to see
	* the upper 5 bits of (14bit) major.
	*/
	if (!sysv_valid_dev(rdev) \|\| MAJOR(rdev) & ~0x1ff)
	return -EINVAL;

	if (test_default_acl && test_default_acl(dvp)) {
	if (!_ACL_ALLOC(default_acl))
	return -ENOMEM;
	if (!_ACL_GET_DEFAULT(dvp, default_acl)) {
	_ACL_FREE(default_acl);
	default_acl = NULL;
	}
	}

	if (IS_POSIXACL(dir) && !default_acl && has_fs_struct(current))
	mode &= ~current->fs->umask;

	memset(&va, 0, sizeof(va));
	va.va_mask = XFS_AT_TYPE\|XFS_AT_MODE;
	va.va_mode = mode;

	switch (mode & S_IFMT) {
	case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:
	va.va_rdev = sysv_encode_dev(rdev);
	va.va_mask \|= XFS_AT_RDEV;
	/FALLTHROUGH/
	case S_IFREG:
	VOP_CREATE(dvp, dentry, &va, &vp, NULL, error);
	break;
	case S_IFDIR:
	VOP_MKDIR(dvp, dentry, &va, &vp, NULL, error);
	break;
	default:
	error = EINVAL;
	break;
	}

	if (default_acl) {
	if (!error) {
	error = _ACL_INHERIT(vp, &va, default_acl);
	if (!error) {
	VMODIFY(vp);
	} else {
	struct dentry teardown = {};
	int err2;

	/* Oh, the horror.
	* If we can't add the ACL we must back out.
	* ENOSPC can hit here, among other things.
	*/
	teardown.d_inode = ip = LINVFS_GET_IP(vp);
	teardown.d_name = dentry->d_name;

	vn_mark_bad(vp);

	if (S_ISDIR(mode))
	VOP_RMDIR(dvp, &teardown, NULL, err2);
	else
	VOP_REMOVE(dvp, &teardown, NULL, err2);
	VN_RELE(vp);
	}
	}
	_ACL_FREE(default_acl);
	}

	if (!error) {
	ASSERT(vp);
	ip = LINVFS_GET_IP(vp);

	if (S_ISCHR(mode) \|\| S_ISBLK(mode))
	ip->i_rdev = rdev;
	else if (S_ISDIR(mode))
	validate_fields(ip);
	d_instantiate(dentry, ip);
	validate_fields(dir);
	}
	return -error;
	}

	STATIC int
	linvfs_create(
	struct inode *dir,
	struct dentry *dentry,
	int mode,
	struct nameidata *nd)
	{
	return linvfs_mknod(dir, dentry, mode, 0);
	}

	STATIC int
	linvfs_mkdir(
	struct inode *dir,
	struct dentry *dentry,
	int mode)
	{
	return linvfs_mknod(dir, dentry, mode\|S_IFDIR, 0);
	}

	STATIC struct dentry *
	linvfs_lookup(
	struct inode *dir,
	struct dentry *dentry,
	struct nameidata *nd)
	{
	struct vnode vp = LINVFS_GET_VP(dir), cvp;
	int error;

	if (dentry->d_name.len >= MAXNAMELEN)
	return ERR_PTR(-ENAMETOOLONG);

	VOP_LOOKUP(vp, dentry, &cvp, 0, NULL, NULL, error);
	if (error) {
	if (unlikely(error != ENOENT))
	return ERR_PTR(-error);
	d_add(dentry, NULL);
	return NULL;
	}

	return d_splice_alias(LINVFS_GET_IP(cvp), dentry);
	}

	STATIC int
	linvfs_link(
	struct dentry *old_dentry,
	struct inode *dir,
	struct dentry *dentry)
	{
	struct inode ip; / inode of guy being linked to */
	vnode_t tdvp; / target directory for new name/link */
	vnode_t vp; / vp of name being linked */
	int error;

	ip = old_dentry->d_inode; /* inode being linked to */
	if (S_ISDIR(ip->i_mode))
	return -EPERM;

	tdvp = LINVFS_GET_VP(dir);
	vp = LINVFS_GET_VP(ip);

	VOP_LINK(tdvp, vp, dentry, NULL, error);
	if (!error) {
	VMODIFY(tdvp);
	VN_HOLD(vp);
	validate_fields(ip);
	d_instantiate(dentry, ip);
	}
	return -error;
	}

	STATIC int
	linvfs_unlink(
	struct inode *dir,
	struct dentry *dentry)
	{
	struct inode *inode;
	vnode_t dvp; / directory containing name to remove */
	int error;

	inode = dentry->d_inode;
	dvp = LINVFS_GET_VP(dir);

	VOP_REMOVE(dvp, dentry, NULL, error);
	if (!error) {
	validate_fields(dir); /* For size only */
	validate_fields(inode);
	}

	return -error;
	}

	STATIC int
	linvfs_symlink(
	struct inode *dir,
	struct dentry *dentry,
	const char *symname)
	{
	struct inode *ip;
	vattr_t va;
	vnode_t dvp; / directory containing name of symlink */
	vnode_t cvp; / used to lookup symlink to put in dentry */
	int error;

	dvp = LINVFS_GET_VP(dir);
	cvp = NULL;

	memset(&va, 0, sizeof(va));
	va.va_mode = S_IFLNK \|
	(irix_symlink_mode ? 0777 & ~current->fs->umask : S_IRWXUGO);
	va.va_mask = XFS_AT_TYPE\|XFS_AT_MODE;

	error = 0;
	VOP_SYMLINK(dvp, dentry, &va, (char *)symname, &cvp, NULL, error);
	if (!error && cvp) {
	ip = LINVFS_GET_IP(cvp);
	d_instantiate(dentry, ip);
	validate_fields(dir);
	validate_fields(ip); /* size needs update */
	}
	return -error;
	}

	STATIC int
	linvfs_rmdir(
	struct inode *dir,
	struct dentry *dentry)
	{
	struct inode *inode = dentry->d_inode;
	vnode_t *dvp = LINVFS_GET_VP(dir);
	int error;

	VOP_RMDIR(dvp, dentry, NULL, error);
	if (!error) {
	validate_fields(inode);
	validate_fields(dir);
	}
	return -error;
	}

	STATIC int
	linvfs_rename(
	struct inode *odir,
	struct dentry *odentry,
	struct inode *ndir,
	struct dentry *ndentry)
	{
	struct inode *new_inode = ndentry->d_inode;
	vnode_t fvp; / from directory */
	vnode_t tvp; / target directory */
	int error;

	fvp = LINVFS_GET_VP(odir);
	tvp = LINVFS_GET_VP(ndir);

	VOP_RENAME(fvp, odentry, tvp, ndentry, NULL, error);
	if (error)
	return -error;

	if (new_inode)
	validate_fields(new_inode);

	validate_fields(odir);
	if (ndir != odir)
	validate_fields(ndir);
	return 0;
	}

	/*
	* careful here - this function can get called recursively, so
	* we need to be very careful about how much stack we use.
	* uio is kmalloced for this reason...
	*/
	STATIC void *
	linvfs_follow_link(
	struct dentry *dentry,
	struct nameidata *nd)
	{
	vnode_t *vp;
	uio_t *uio;
	iovec_t iov;
	int error;
	char *link;

	ASSERT(dentry);
	ASSERT(nd);

	link = (char *)kmalloc(MAXNAMELEN+1, GFP_KERNEL);
	if (!link) {
	nd_set_link(nd, ERR_PTR(-ENOMEM));
	return NULL;
	}

	uio = (uio_t *)kmalloc(sizeof(uio_t), GFP_KERNEL);
	if (!uio) {
	kfree(link);
	nd_set_link(nd, ERR_PTR(-ENOMEM));
	return NULL;
	}

	vp = LINVFS_GET_VP(dentry->d_inode);

	iov.iov_base = link;
	iov.iov_len = MAXNAMELEN;

	uio->uio_iov = &iov;
	uio->uio_offset = 0;
	uio->uio_segflg = UIO_SYSSPACE;
	uio->uio_resid = MAXNAMELEN;
	uio->uio_iovcnt = 1;

	VOP_READLINK(vp, uio, 0, NULL, error);
	if (error) {
	kfree(link);
	link = ERR_PTR(-error);
	} else {
	link[MAXNAMELEN - uio->uio_resid] = '\0';
	}
	kfree(uio);

	nd_set_link(nd, link);
	return NULL;
	}

	static void linvfs_put_link(struct dentry dentry, struct nameidata nd, void *p)
	{
	char *s = nd_get_link(nd);
	if (!IS_ERR(s))
	kfree(s);
	}

	#ifdef CONFIG_XFS_POSIX_ACL
	STATIC int
	linvfs_permission(
	struct inode *inode,
	int mode,
	struct nameidata *nd)
	{
	vnode_t *vp = LINVFS_GET_VP(inode);
	int error;

	mode <<= 6; /* convert from linux to vnode access bits */
	VOP_ACCESS(vp, mode, NULL, error);
	return -error;
	}
	#else
	#define linvfs_permission NULL
	#endif

	STATIC int
	linvfs_getattr(
	struct vfsmount *mnt,
	struct dentry *dentry,
	struct kstat *stat)
	{
	struct inode *inode = dentry->d_inode;
	vnode_t *vp = LINVFS_GET_VP(inode);
	int error = 0;

	if (unlikely(vp->v_flag & VMODIFIED))
	error = vn_revalidate(vp);
	if (!error)
	generic_fillattr(inode, stat);
	return 0;
	}

	STATIC int
	linvfs_setattr(
	struct dentry *dentry,
	struct iattr *attr)
	{
	struct inode *inode = dentry->d_inode;
	unsigned int ia_valid = attr->ia_valid;
	vnode_t *vp = LINVFS_GET_VP(inode);
	vattr_t vattr;
	int flags = 0;
	int error;

	memset(&vattr, 0, sizeof(vattr_t));
	if (ia_valid & ATTR_UID) {
	vattr.va_mask \|= XFS_AT_UID;
	vattr.va_uid = attr->ia_uid;
	}
	if (ia_valid & ATTR_GID) {
	vattr.va_mask \|= XFS_AT_GID;
	vattr.va_gid = attr->ia_gid;
	}
	if (ia_valid & ATTR_SIZE) {
	vattr.va_mask \|= XFS_AT_SIZE;
	vattr.va_size = attr->ia_size;
	}
	if (ia_valid & ATTR_ATIME) {
	vattr.va_mask \|= XFS_AT_ATIME;
	vattr.va_atime = attr->ia_atime;
	}
	if (ia_valid & ATTR_MTIME) {
	vattr.va_mask \|= XFS_AT_MTIME;
	vattr.va_mtime = attr->ia_mtime;
	}
	if (ia_valid & ATTR_CTIME) {
	vattr.va_mask \|= XFS_AT_CTIME;
	vattr.va_ctime = attr->ia_ctime;
	}
	if (ia_valid & ATTR_MODE) {
	vattr.va_mask \|= XFS_AT_MODE;
	vattr.va_mode = attr->ia_mode;
	if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
	inode->i_mode &= ~S_ISGID;
	}

	if (ia_valid & (ATTR_MTIME_SET \| ATTR_ATIME_SET))
	flags \|= ATTR_UTIME;
	#ifdef ATTR_NO_BLOCK
	if ((ia_valid & ATTR_NO_BLOCK))
	flags \|= ATTR_NONBLOCK;
	#endif

	VOP_SETATTR(vp, &vattr, flags, NULL, error);
	if (error)
	return -error;
	vn_revalidate(vp);
	return error;
	}

	STATIC void
	linvfs_truncate(
	struct inode *inode)
	{
	block_truncate_page(inode->i_mapping, inode->i_size, linvfs_get_block);
	}

	STATIC int
	linvfs_setxattr(
	struct dentry *dentry,
	const char *name,
	const void *data,
	size_t size,
	int flags)
	{
	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
	char attr = (char )name;
	attrnames_t *namesp;
	int xflags = 0;
	int error;

	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
	if (!namesp)
	return -EOPNOTSUPP;
	attr += namesp->attr_namelen;
	error = namesp->attr_capable(vp, NULL);
	if (error)
	return error;

	/* Convert Linux syscall to XFS internal ATTR flags */
	if (flags & XATTR_CREATE)
	xflags \|= ATTR_CREATE;
	if (flags & XATTR_REPLACE)
	xflags \|= ATTR_REPLACE;
	xflags \|= namesp->attr_flag;
	return namesp->attr_set(vp, attr, (void *)data, size, xflags);
	}

	STATIC ssize_t
	linvfs_getxattr(
	struct dentry *dentry,
	const char *name,
	void *data,
	size_t size)
	{
	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
	char attr = (char )name;
	attrnames_t *namesp;
	int xflags = 0;
	ssize_t error;

	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
	if (!namesp)
	return -EOPNOTSUPP;
	attr += namesp->attr_namelen;
	error = namesp->attr_capable(vp, NULL);
	if (error)
	return error;

	/* Convert Linux syscall to XFS internal ATTR flags */
	if (!size) {
	xflags \|= ATTR_KERNOVAL;
	data = NULL;
	}
	xflags \|= namesp->attr_flag;
	return namesp->attr_get(vp, attr, (void *)data, size, xflags);
	}

	STATIC ssize_t
	linvfs_listxattr(
	struct dentry *dentry,
	char *data,
	size_t size)
	{
	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
	int error, xflags = ATTR_KERNAMELS;
	ssize_t result;

	if (!size)
	xflags \|= ATTR_KERNOVAL;
	xflags \|= capable(CAP_SYS_ADMIN) ? ATTR_KERNFULLS : ATTR_KERNORMALS;

	error = attr_generic_list(vp, data, size, xflags, &result);
	if (error < 0)
	return error;
	return result;
	}

	STATIC int
	linvfs_removexattr(
	struct dentry *dentry,
	const char *name)
	{
	vnode_t *vp = LINVFS_GET_VP(dentry->d_inode);
	char attr = (char )name;
	attrnames_t *namesp;
	int xflags = 0;
	int error;

	namesp = attr_lookup_namespace(attr, attr_namespaces, ATTR_NAMECOUNT);
	if (!namesp)
	return -EOPNOTSUPP;
	attr += namesp->attr_namelen;
	error = namesp->attr_capable(vp, NULL);
	if (error)
	return error;
	xflags \|= namesp->attr_flag;
	return namesp->attr_remove(vp, attr, xflags);
	}


	struct inode_operations linvfs_file_inode_operations = {
	.permission = linvfs_permission,
	.truncate = linvfs_truncate,
	.getattr = linvfs_getattr,
	.setattr = linvfs_setattr,
	.setxattr = linvfs_setxattr,
	.getxattr = linvfs_getxattr,
	.listxattr = linvfs_listxattr,
	.removexattr = linvfs_removexattr,
	};

	struct inode_operations linvfs_dir_inode_operations = {
	.create = linvfs_create,
	.lookup = linvfs_lookup,
	.link = linvfs_link,
	.unlink = linvfs_unlink,
	.symlink = linvfs_symlink,
	.mkdir = linvfs_mkdir,
	.rmdir = linvfs_rmdir,
	.mknod = linvfs_mknod,
	.rename = linvfs_rename,
	.permission = linvfs_permission,
	.getattr = linvfs_getattr,
	.setattr = linvfs_setattr,
	.setxattr = linvfs_setxattr,
	.getxattr = linvfs_getxattr,
	.listxattr = linvfs_listxattr,
	.removexattr = linvfs_removexattr,
	};

	struct inode_operations linvfs_symlink_inode_operations = {
	.readlink = generic_readlink,
	.follow_link = linvfs_follow_link,
	.put_link = linvfs_put_link,
	.permission = linvfs_permission,
	.getattr = linvfs_getattr,
	.setattr = linvfs_setattr,
	.setxattr = linvfs_setxattr,
	.getxattr = linvfs_getxattr,
	.listxattr = linvfs_listxattr,
	.removexattr = linvfs_removexattr,
	};