common/fs/xattr.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/param.h>
#include <sys/isa_defs.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/cred.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/pathname.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <sys/acl.h>
#include <sys/file.h>
#include <sys/sunddi.h>
#include <sys/debug.h>
#include <sys/cmn_err.h>
#include <sys/vnode.h>
#include <sys/mode.h>
#include <sys/nvpair.h>
#include <sys/attr.h>
#include <sys/gfs.h>
#include <sys/mutex.h>
#include <fs/fs_subr.h>
#include <sys/kidmap.h>

typedef struct {
	gfs_file_t	gfs_private;
	xattr_view_t	xattr_view;
} xattr_file_t;

/* ARGSUSED */
static int
xattr_file_open(vnode_t **vpp, int flags, cred_t *cr, caller_context_t *ct)
{
	xattr_file_t *np = (*vpp)->v_data;

	if ((np->xattr_view == XATTR_VIEW_READONLY) && (flags & FWRITE))
		return (EACCES);

	return (0);
}

/* ARGSUSED */
static int
xattr_file_access(vnode_t *vp, int mode, int flags, cred_t *cr,
    caller_context_t *ct)
{
	xattr_file_t *np = vp->v_data;

	if ((np->xattr_view == XATTR_VIEW_READONLY) && (mode & VWRITE))
		return (EACCES);

	return (0);
}

/* ARGSUSED */
static int
xattr_file_close(vnode_t *vp, int flags, int count, offset_t off,
    cred_t *cr, caller_context_t *ct)
{
	cleanlocks(vp, ddi_get_pid(), 0);
	cleanshares(vp, ddi_get_pid());
	return (0);
}

static int
xattr_common_fid(vnode_t *vp, fid_t *fidp, caller_context_t *ct)
{
	xattr_fid_t	*xfidp;
	vnode_t		*pvp, *savevp;
	int		error;
	uint16_t	orig_len;

	if (fidp->fid_len < XATTR_FIDSZ) {
		fidp->fid_len = XATTR_FIDSZ;
		return (ENOSPC);
	}

	savevp = pvp = gfs_file_parent(vp);
	mutex_enter(&savevp->v_lock);
	if (pvp->v_flag & V_XATTRDIR) {
		pvp = gfs_file_parent(pvp);
	}
	mutex_exit(&savevp->v_lock);

	xfidp = (xattr_fid_t *)fidp;
	orig_len = fidp->fid_len;
	fidp->fid_len = sizeof (xfidp->parent_fid);

	error = VOP_FID(pvp, fidp, ct);
	if (error) {
		fidp->fid_len = orig_len;
		return (error);
	}

	xfidp->parent_len = fidp->fid_len;
	fidp->fid_len = XATTR_FIDSZ;
	xfidp->dir_offset = gfs_file_inode(vp);

	return (0);
}

/* ARGSUSED */
static int
xattr_fill_nvlist(vnode_t *vp, xattr_view_t xattr_view, nvlist_t *nvlp,
    cred_t *cr, caller_context_t *ct)
{
	int error;
	f_attr_t attr;
	uint64_t fsid;
	xvattr_t xvattr;
	xoptattr_t *xoap;	/* Pointer to optional attributes */
	vnode_t *ppvp;
	const char *domain;
	uint32_t rid;

	xva_init(&xvattr);

	if ((xoap = xva_getxoptattr(&xvattr)) == NULL)
		return (EINVAL);

	/*
	 * For detecting ephemeral uid/gid
	 */
	xvattr.xva_vattr.va_mask |= (AT_UID|AT_GID);

	/*
	 * We need to access the real fs object.
	 * vp points to a GFS file; ppvp points to the real object.
	 */
	ppvp = gfs_file_parent(gfs_file_parent(vp));

	/*
	 * Iterate through the attrs associated with this view
	 */

	for (attr = 0; attr < F_ATTR_ALL; attr++) {
		if (xattr_view != attr_to_xattr_view(attr)) {
			continue;
		}

		switch (attr) {
		case F_SYSTEM:
			XVA_SET_REQ(&xvattr, XAT_SYSTEM);
			break;
		case F_READONLY:
			XVA_SET_REQ(&xvattr, XAT_READONLY);
			break;
		case F_HIDDEN:
			XVA_SET_REQ(&xvattr, XAT_HIDDEN);
			break;
		case F_ARCHIVE:
			XVA_SET_REQ(&xvattr, XAT_ARCHIVE);
			break;
		case F_IMMUTABLE:
			XVA_SET_REQ(&xvattr, XAT_IMMUTABLE);
			break;
		case F_APPENDONLY:
			XVA_SET_REQ(&xvattr, XAT_APPENDONLY);
			break;
		case F_NOUNLINK:
			XVA_SET_REQ(&xvattr, XAT_NOUNLINK);
			break;
		case F_OPAQUE:
			XVA_SET_REQ(&xvattr, XAT_OPAQUE);
			break;
		case F_NODUMP:
			XVA_SET_REQ(&xvattr, XAT_NODUMP);
			break;
		case F_AV_QUARANTINED:
			XVA_SET_REQ(&xvattr, XAT_AV_QUARANTINED);
			break;
		case F_AV_MODIFIED:
			XVA_SET_REQ(&xvattr, XAT_AV_MODIFIED);
			break;
		case F_AV_SCANSTAMP:
			if (ppvp->v_type == VREG)
				XVA_SET_REQ(&xvattr, XAT_AV_SCANSTAMP);
			break;
		case F_CRTIME:
			XVA_SET_REQ(&xvattr, XAT_CREATETIME);
			break;
		case F_FSID:
			fsid = (((uint64_t)vp->v_vfsp->vfs_fsid.val[0] << 32) |
			    (uint64_t)(vp->v_vfsp->vfs_fsid.val[1] &
			    0xffffffff));
			VERIFY(nvlist_add_uint64(nvlp, attr_to_name(attr),
			    fsid) == 0);
			break;
		default:
			break;
		}
	}

	error = VOP_GETATTR(ppvp, &xvattr.xva_vattr, 0, cr, ct);
	if (error)
		return (error);

	/*
	 * Process all the optional attributes together here.  Notice that
	 * xoap was set when the optional attribute bits were set above.
	 */
	if ((xvattr.xva_vattr.va_mask & AT_XVATTR) && xoap) {
		if (XVA_ISSET_RTN(&xvattr, XAT_READONLY)) {
			VERIFY(nvlist_add_boolean_value(nvlp,
			    attr_to_name(F_READONLY),
			    xoap->xoa_readonly) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_HIDDEN)) {
			VERIFY(nvlist_add_boolean_value(nvlp,
			    attr_to_name(F_HIDDEN),
			    xoap->xoa_hidden) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_SYSTEM)) {
			VERIFY(nvlist_add_boolean_value(nvlp,
			    attr_to_name(F_SYSTEM),
			    xoap->xoa_system) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_ARCHIVE)) {
			VERIFY(nvlist_add_boolean_value(nvlp,
			    attr_to_name(F_ARCHIVE),
			    xoap->xoa_archive) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_IMMUTABLE)) {
			VERIFY(nvlist_add_boolean_value(nvlp,
			    attr_to_name(F_IMMUTABLE),
			    xoap->xoa_immutable) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_NOUNLINK)) {
			VERIFY(nvlist_add_boolean_value(nvlp,
			    attr_to_name(F_NOUNLINK),
			    xoap->xoa_nounlink) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_APPENDONLY)) {
			VERIFY(nvlist_add_boolean_value(nvlp,
			    attr_to_name(F_APPENDONLY),
			    xoap->xoa_appendonly) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_NODUMP)) {
			VERIFY(nvlist_add_boolean_value(nvlp,
			    attr_to_name(F_NODUMP),
			    xoap->xoa_nodump) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_OPAQUE)) {
			VERIFY(nvlist_add_boolean_value(nvlp,
			    attr_to_name(F_OPAQUE),
			    xoap->xoa_opaque) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_AV_QUARANTINED)) {
			VERIFY(nvlist_add_boolean_value(nvlp,
			    attr_to_name(F_AV_QUARANTINED),
			    xoap->xoa_av_quarantined) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_AV_MODIFIED)) {
			VERIFY(nvlist_add_boolean_value(nvlp,
			    attr_to_name(F_AV_MODIFIED),
			    xoap->xoa_av_modified) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_AV_SCANSTAMP)) {
			VERIFY(nvlist_add_uint8_array(nvlp,
			    attr_to_name(F_AV_SCANSTAMP),
			    xoap->xoa_av_scanstamp,
			    sizeof (xoap->xoa_av_scanstamp)) == 0);
		}
		if (XVA_ISSET_RTN(&xvattr, XAT_CREATETIME)) {
			VERIFY(nvlist_add_uint64_array(nvlp,
			    attr_to_name(F_CRTIME),
			    (uint64_t *)&(xoap->xoa_createtime),
			    sizeof (xoap->xoa_createtime) /
			    sizeof (uint64_t)) == 0);
		}
	}
	/*
	 * Check for optional ownersid/groupsid
	 */

	if (xvattr.xva_vattr.va_uid > MAXUID) {
		nvlist_t *nvl_sid;

		if (nvlist_alloc(&nvl_sid, NV_UNIQUE_NAME, KM_SLEEP))
			return (ENOMEM);

		if (kidmap_getsidbyuid(crgetzone(cr), xvattr.xva_vattr.va_uid,
		    &domain, &rid) == 0) {
			VERIFY(nvlist_add_string(nvl_sid,
			    SID_DOMAIN, domain) == 0);
			VERIFY(nvlist_add_uint32(nvl_sid, SID_RID, rid) == 0);
			VERIFY(nvlist_add_nvlist(nvlp, attr_to_name(F_OWNERSID),
			    nvl_sid) == 0);
		}
		nvlist_free(nvl_sid);
	}
	if (xvattr.xva_vattr.va_gid > MAXUID) {
		nvlist_t *nvl_sid;

		if (nvlist_alloc(&nvl_sid, NV_UNIQUE_NAME, KM_SLEEP))
			return (ENOMEM);

		if (kidmap_getsidbygid(crgetzone(cr), xvattr.xva_vattr.va_gid,
		    &domain, &rid) == 0) {
			VERIFY(nvlist_add_string(nvl_sid,
			    SID_DOMAIN, domain) == 0);
			VERIFY(nvlist_add_uint32(nvl_sid, SID_RID, rid) == 0);
			VERIFY(nvlist_add_nvlist(nvlp, attr_to_name(F_GROUPSID),
			    nvl_sid) == 0);
		}
		nvlist_free(nvl_sid);
	}

	return (0);
}

/*
 * The size of a sysattr file is the size of the nvlist that will be
 * returned by xattr_file_read().  A call to xattr_file_write() could
 * change the size of that nvlist.  That size is not stored persistently
 * so xattr_fill_nvlist() calls VOP_GETATTR so that it can be calculated.
 */
static int
xattr_file_size(vnode_t *vp, xattr_view_t xattr_view, size_t *size,
    cred_t *cr, caller_context_t *ct)
{
	nvlist_t *nvl;

	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP)) {
		return (ENOMEM);
	}

	if (xattr_fill_nvlist(vp, xattr_view, nvl, cr, ct)) {
		nvlist_free(nvl);
		return (EFAULT);
	}

	VERIFY(nvlist_size(nvl, size, NV_ENCODE_XDR) == 0);
	nvlist_free(nvl);
	return (0);
}

/* ARGSUSED */
static int
xattr_file_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
    caller_context_t *ct)
{
	xattr_file_t *np = vp->v_data;
	timestruc_t now;
	size_t size;
	int error;
	vnode_t *pvp;
	vattr_t pvattr;

	vap->va_type = VREG;
	vap->va_mode = MAKEIMODE(vap->va_type,
	    (np->xattr_view == XATTR_VIEW_READONLY ? 0444 : 0644));
	vap->va_nodeid = gfs_file_inode(vp);
	vap->va_nlink = 1;
	pvp = gfs_file_parent(vp);
	(void) memset(&pvattr, 0, sizeof (pvattr));
	pvattr.va_mask = AT_CTIME|AT_MTIME;
	error = VOP_GETATTR(pvp, &pvattr, flags, cr, ct);
	if (error) {
		return (error);
	}
	vap->va_ctime = pvattr.va_ctime;
	vap->va_mtime = pvattr.va_mtime;
	gethrestime(&now);
	vap->va_atime = now;
	vap->va_uid = 0;
	vap->va_gid = 0;
	vap->va_rdev = 0;
	vap->va_blksize = DEV_BSIZE;
	vap->va_seq = 0;
	vap->va_fsid = vp->v_vfsp->vfs_dev;
	error = xattr_file_size(vp, np->xattr_view, &size, cr, ct);
	vap->va_size = size;
	vap->va_nblocks = howmany(vap->va_size, vap->va_blksize);
	return (error);
}

/* ARGSUSED */
static int
xattr_file_read(vnode_t *vp, uio_t *uiop, int ioflag, cred_t *cr,
    caller_context_t *ct)
{
	xattr_file_t *np = vp->v_data;
	xattr_view_t xattr_view = np->xattr_view;
	char *buf;
	size_t filesize;
	nvlist_t *nvl;
	int error;

	/*
	 * Validate file offset and fasttrack empty reads
	 */
	if (uiop->uio_loffset < (offset_t)0)
		return (EINVAL);

	if (uiop->uio_resid == 0)
		return (0);

	if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP))
		return (ENOMEM);

	if (xattr_fill_nvlist(vp, xattr_view, nvl, cr, ct)) {
		nvlist_free(nvl);
		return (EFAULT);
	}

	VERIFY(nvlist_size(nvl, &filesize, NV_ENCODE_XDR) == 0);

	if (uiop->uio_loffset >= filesize) {
		nvlist_free(nvl);
		return (0);
	}

	buf = kmem_alloc(filesize, KM_SLEEP);
	VERIFY(nvlist_pack(nvl, &buf, &filesize, NV_ENCODE_XDR,
	    KM_SLEEP) == 0);

	error = uiomove((caddr_t)buf, filesize, UIO_READ, uiop);
	kmem_free(buf, filesize);
	nvlist_free(nvl);
	return (error);
}

/* ARGSUSED */
static int
xattr_file_write(vnode_t *vp, uio_t *uiop, int ioflag, cred_t *cr,
    caller_context_t *ct)
{
	int error = 0;
	char *buf;
	char *domain;
	uint32_t rid;
	ssize_t size = uiop->uio_resid;
	nvlist_t *nvp;
	nvpair_t *pair = NULL;
	vnode_t *ppvp;
	xvattr_t xvattr;
	xoptattr_t *xoap = NULL;	/* Pointer to optional attributes */

	/*
	 * Validate file offset and size.
	 */
	if (uiop->uio_loffset < (offset_t)0)
		return (EINVAL);

	if (size == 0)
		return (EINVAL);

	xva_init(&xvattr);

	if ((xoap = xva_getxoptattr(&xvattr)) == NULL) {
		return (EINVAL);
	}

	/*
	 * Copy and unpack the nvlist
	 */
	buf = kmem_alloc(size, KM_SLEEP);
	if (uiomove((caddr_t)buf, size, UIO_WRITE, uiop)) {
		return (EFAULT);
	}

	if (nvlist_unpack(buf, size, &nvp, KM_SLEEP) != 0) {
		kmem_free(buf, size);
		uiop->uio_resid = size;
		return (EINVAL);
	}
	kmem_free(buf, size);

	/*
	 * Fasttrack empty writes (nvlist with no nvpairs)
	 */
	if (nvlist_next_nvpair(nvp, NULL) == 0)
		return (0);

	ppvp = gfs_file_parent(gfs_file_parent(vp));

	while (pair = nvlist_next_nvpair(nvp, pair)) {
		data_type_t type;
		f_attr_t attr;
		boolean_t value;
		uint64_t *time, *times;
		uint_t elem, nelems;
		nvlist_t *nvp_sid;
		uint8_t *scanstamp;

		/*
		 * Validate the name and type of each attribute.
		 * Log any unknown names and continue.  This will
		 * help if additional attributes are added later.
		 */
		type = nvpair_type(pair);
		if ((attr = name_to_attr(nvpair_name(pair))) == F_ATTR_INVAL) {
			cmn_err(CE_WARN, "Unknown attribute %s",
			    nvpair_name(pair));
			continue;
		}

		/*
		 * Verify nvlist type matches required type and view is OK
		 */

		if (type != attr_to_data_type(attr) ||
		    (attr_to_xattr_view(attr) == XATTR_VIEW_READONLY)) {
			nvlist_free(nvp);
			return (EINVAL);
		}

		/*
		 * For OWNERSID/GROUPSID make sure the target
		 * file system support ephemeral ID's
		 */
		if ((attr == F_OWNERSID || attr == F_GROUPSID) &&
		    (!(vp->v_vfsp->vfs_flag & VFS_XID))) {
			nvlist_free(nvp);
			return (EINVAL);
		}

		/*
		 * Retrieve data from nvpair
		 */
		switch (type) {
		case DATA_TYPE_BOOLEAN_VALUE:
			if (nvpair_value_boolean_value(pair, &value)) {
				nvlist_free(nvp);
				return (EINVAL);
			}
			break;
		case DATA_TYPE_UINT64_ARRAY:
			if (nvpair_value_uint64_array(pair, &times, &nelems)) {
				nvlist_free(nvp);
				return (EINVAL);
			}
			break;
		case DATA_TYPE_NVLIST:
			if (nvpair_value_nvlist(pair, &nvp_sid)) {
				nvlist_free(nvp);
				return (EINVAL);
			}
			break;
		case DATA_TYPE_UINT8_ARRAY:
			if (nvpair_value_uint8_array(pair,
			    &scanstamp, &nelems)) {
				nvlist_free(nvp);
				return (EINVAL);
			}
			break;
		default:
			nvlist_free(nvp);
			return (EINVAL);
		}

		switch (attr) {
		/*
		 * If we have several similar optional attributes to
		 * process then we should do it all together here so that
		 * xoap and the requested bitmap can be set in one place.
		 */
		case F_READONLY:
			XVA_SET_REQ(&xvattr, XAT_READONLY);
			xoap->xoa_readonly = value;
			break;
		case F_HIDDEN:
			XVA_SET_REQ(&xvattr, XAT_HIDDEN);
			xoap->xoa_hidden = value;
			break;
		case F_SYSTEM:
			XVA_SET_REQ(&xvattr, XAT_SYSTEM);
			xoap->xoa_system = value;
			break;
		case F_ARCHIVE:
			XVA_SET_REQ(&xvattr, XAT_ARCHIVE);
			xoap->xoa_archive = value;
			break;
		case F_IMMUTABLE:
			XVA_SET_REQ(&xvattr, XAT_IMMUTABLE);
			xoap->xoa_immutable = value;
			break;
		case F_NOUNLINK:
			XVA_SET_REQ(&xvattr, XAT_NOUNLINK);
			xoap->xoa_nounlink = value;
			break;
		case F_APPENDONLY:
			XVA_SET_REQ(&xvattr, XAT_APPENDONLY);
			xoap->xoa_appendonly = value;
			break;
		case F_NODUMP:
			XVA_SET_REQ(&xvattr, XAT_NODUMP);
			xoap->xoa_nodump = value;
			break;
		case F_AV_QUARANTINED:
			XVA_SET_REQ(&xvattr, XAT_AV_QUARANTINED);
			xoap->xoa_av_quarantined = value;
			break;
		case F_AV_MODIFIED:
			XVA_SET_REQ(&xvattr, XAT_AV_MODIFIED);
			xoap->xoa_av_modified = value;
			break;
		case F_CRTIME:
			XVA_SET_REQ(&xvattr, XAT_CREATETIME);
			time = (uint64_t *)&(xoap->xoa_createtime);
			for (elem = 0; elem < nelems; elem++)
				*time++ = times[elem];
			break;
		case F_OWNERSID:
		case F_GROUPSID:
			if (nvlist_lookup_string(nvp_sid, SID_DOMAIN,
			    &domain) || nvlist_lookup_uint32(nvp_sid, SID_RID,
			    &rid)) {
				nvlist_free(nvp);
				return (EINVAL);
			}

			/*
			 * Now map domain+rid to ephemeral id's
			 *
			 * If mapping fails, then the uid/gid will
			 * be set to UID_NOBODY by Winchester.
			 */

			if (attr == F_OWNERSID) {
				(void) kidmap_getuidbysid(crgetzone(cr), domain,
				    rid, &xvattr.xva_vattr.va_uid);
				xvattr.xva_vattr.va_mask |= AT_UID;
			} else {
				(void) kidmap_getgidbysid(crgetzone(cr), domain,
				    rid, &xvattr.xva_vattr.va_gid);
				xvattr.xva_vattr.va_mask |= AT_GID;
			}
			break;
		case F_AV_SCANSTAMP:
			if (ppvp->v_type == VREG) {
				XVA_SET_REQ(&xvattr, XAT_AV_SCANSTAMP);
				(void) memcpy(xoap->xoa_av_scanstamp,
				    scanstamp, nelems);
			} else {
				nvlist_free(nvp);
				return (EINVAL);
			}
			break;
		default:
			break;
		}
	}

	ppvp = gfs_file_parent(gfs_file_parent(vp));
	error = VOP_SETATTR(ppvp, &xvattr.xva_vattr, 0, cr, ct);
	if (error)
		uiop->uio_resid = size;

	nvlist_free(nvp);
	return (error);
}

static int
xattr_file_pathconf(vnode_t *vp, int cmd, ulong_t *valp, cred_t *cr,
    caller_context_t *ct)
{
	switch (cmd) {
	case _PC_XATTR_EXISTS:
	case _PC_SATTR_ENABLED:
	case _PC_SATTR_EXISTS:
		*valp = 0;
		return (0);
	default:
		return (fs_pathconf(vp, cmd, valp, cr, ct));
	}
}

vnodeops_t *xattr_file_ops;

static const fs_operation_def_t xattr_file_tops[] = {
	{ VOPNAME_OPEN,		{ .vop_open = xattr_file_open }		},
	{ VOPNAME_CLOSE,	{ .vop_close = xattr_file_close }	},
	{ VOPNAME_READ,		{ .vop_read = xattr_file_read }		},
	{ VOPNAME_WRITE,	{ .vop_write = xattr_file_write }	},
	{ VOPNAME_IOCTL,	{ .error = fs_ioctl }			},
	{ VOPNAME_GETATTR,	{ .vop_getattr = xattr_file_getattr }	},
	{ VOPNAME_ACCESS,	{ .vop_access = xattr_file_access }	},
	{ VOPNAME_READDIR,	{ .error = fs_notdir }			},
	{ VOPNAME_SEEK,		{ .vop_seek = fs_seek }			},
	{ VOPNAME_INACTIVE,	{ .vop_inactive = gfs_vop_inactive }	},
	{ VOPNAME_FID,		{ .vop_fid = xattr_common_fid }		},
	{ VOPNAME_PATHCONF,	{ .vop_pathconf = xattr_file_pathconf }	},
	{ VOPNAME_PUTPAGE,	{ .error = fs_putpage }			},
	{ VOPNAME_FSYNC,	{ .error = fs_fsync }			},
	{ NULL }
};

vnode_t *
xattr_mkfile(vnode_t *pvp, xattr_view_t xattr_view)
{
	vnode_t *vp;
	xattr_file_t *np;

	vp = gfs_file_create(sizeof (xattr_file_t), pvp, xattr_file_ops);
	np = vp->v_data;
	np->xattr_view = xattr_view;
	vp->v_flag |= V_SYSATTR;
	return (vp);
}

vnode_t *
xattr_mkfile_ro(vnode_t *pvp)
{
	return (xattr_mkfile(pvp, XATTR_VIEW_READONLY));
}

vnode_t *
xattr_mkfile_rw(vnode_t *pvp)
{
	return (xattr_mkfile(pvp, XATTR_VIEW_READWRITE));
}

vnodeops_t *xattr_dir_ops;

static gfs_dirent_t xattr_dirents[] = {
	{ VIEW_READONLY, xattr_mkfile_ro, GFS_CACHE_VNODE, },
	{ VIEW_READWRITE, xattr_mkfile_rw, GFS_CACHE_VNODE, },
	{ NULL },
};

#define	XATTRDIR_NENTS	((sizeof (xattr_dirents) / sizeof (gfs_dirent_t)) - 1)

static int
is_sattr_name(char *s)
{
	int i;

	for (i = 0; i < XATTRDIR_NENTS; ++i) {
		if (strcmp(s, xattr_dirents[i].gfse_name) == 0) {
			return (1);
		}
	}
	return (0);
}

/*
 * Given the name of an extended attribute file, determine if there is a
 * normalization conflict with a sysattr view name.
 */
int
xattr_sysattr_casechk(char *s)
{
	int i;

	for (i = 0; i < XATTRDIR_NENTS; ++i) {
		if (strcasecmp(s, xattr_dirents[i].gfse_name) == 0)
			return (1);
	}
	return (0);
}

static int
xattr_copy(vnode_t *sdvp, char *snm, vnode_t *tdvp, char *tnm,
    cred_t *cr, caller_context_t *ct)
{
	xvattr_t xvattr;
	vnode_t *pdvp;
	int error;

	/*
	 * Only copy system attrs if the views are the same
	 */
	if (strcmp(snm, tnm) != 0)
		return (EINVAL);

	xva_init(&xvattr);

	XVA_SET_REQ(&xvattr, XAT_SYSTEM);
	XVA_SET_REQ(&xvattr, XAT_READONLY);
	XVA_SET_REQ(&xvattr, XAT_HIDDEN);
	XVA_SET_REQ(&xvattr, XAT_ARCHIVE);
	XVA_SET_REQ(&xvattr, XAT_APPENDONLY);
	XVA_SET_REQ(&xvattr, XAT_NOUNLINK);
	XVA_SET_REQ(&xvattr, XAT_IMMUTABLE);
	XVA_SET_REQ(&xvattr, XAT_NODUMP);
	XVA_SET_REQ(&xvattr, XAT_AV_MODIFIED);
	XVA_SET_REQ(&xvattr, XAT_AV_QUARANTINED);
	XVA_SET_REQ(&xvattr, XAT_CREATETIME);

	pdvp = gfs_file_parent(sdvp);
	error = VOP_GETATTR(pdvp, &xvattr.xva_vattr, 0, cr, ct);
	if (error)
		return (error);

	pdvp = gfs_file_parent(tdvp);
	error = VOP_SETATTR(pdvp, &xvattr.xva_vattr, 0, cr, ct);
	return (error);
}

static int
xattr_dir_realdir(vnode_t *dvp, vnode_t **realdvp, int lookup_flags,
    cred_t *cr, caller_context_t *ct)
{
	vnode_t *pvp;
	int error;
	struct pathname pn;
	char *startnm = "";

	*realdvp = NULL;

	pvp = gfs_file_parent(dvp);

	error = pn_get(startnm, UIO_SYSSPACE, &pn);
	if (error) {
		VN_RELE(pvp);
		return (error);
	}

	/*
	 * Set the LOOKUP_HAVE_SYSATTR_DIR flag so that we don't get into an
	 * infinite loop with fop_lookup calling back to xattr_dir_lookup.
	 */
	lookup_flags |= LOOKUP_HAVE_SYSATTR_DIR;
	error = VOP_LOOKUP(pvp, startnm, realdvp, &pn, lookup_flags,
	    rootvp, cr, ct, NULL, NULL);
	pn_free(&pn);

	return (error);
}

/* ARGSUSED */
static int
xattr_dir_open(vnode_t **vpp, int flags, cred_t *cr, caller_context_t *ct)
{
	if (flags & FWRITE) {
		return (EACCES);
	}

	return (0);
}

/* ARGSUSED */
static int
xattr_dir_close(vnode_t *vpp, int flags, int count, offset_t off, cred_t *cr,
    caller_context_t *ct)
{
	return (0);
}

/* ARGSUSED */
static int
xattr_dir_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
    caller_context_t *ct)
{
	timestruc_t now;
	vnode_t *pvp;
	int error;
	vattr_t pvattr;

	error = xattr_dir_realdir(vp, &pvp, LOOKUP_XATTR, cr, ct);
	if (error == 0) {
		error = VOP_GETATTR(pvp, vap, 0, cr, ct);
		VN_RELE(pvp);
		if (error) {
			return (error);
		}
		vap->va_nlink += XATTRDIR_NENTS;
		vap->va_size += XATTRDIR_NENTS;
		return (0);
	}

	/*
	 * There is no real xattr directory.  Cobble together
	 * an entry using info from the parent object.
	 */
	pvp = gfs_file_parent(vp);
	(void) memset(&pvattr, 0, sizeof (pvattr));
	pvattr.va_mask = AT_UID|AT_GID|AT_RDEV|AT_CTIME|AT_MTIME;
	error = VOP_GETATTR(pvp, &pvattr, 0, cr, ct);
	if (error) {
		return (error);
	}
	*vap = pvattr;
	vap->va_type = VDIR;
	vap->va_mode = MAKEIMODE(vap->va_type, S_ISVTX | 0777);
	vap->va_fsid = vp->v_vfsp->vfs_dev;
	vap->va_nodeid = gfs_file_inode(vp);
	vap->va_nlink = XATTRDIR_NENTS+2;
	vap->va_size = vap->va_nlink;
	gethrestime(&now);
	vap->va_atime = now;
	vap->va_blksize = 0;
	vap->va_nblocks = 0;
	vap->va_seq = 0;
	return (0);
}

static int
xattr_dir_setattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr,
    caller_context_t *ct)
{
	vnode_t *realvp;
	int error;

	/*
	 * If there is a real xattr directory, do the setattr there.
	 * Otherwise, just return success.  The GFS directory is transient,
	 * and any setattr changes can disappear anyway.
	 */
	error = xattr_dir_realdir(vp, &realvp, LOOKUP_XATTR, cr, ct);
	if (error == 0) {
		error = VOP_SETATTR(realvp, vap, flags, cr, ct);
		VN_RELE(realvp);
	}
	if (error == ENOENT) {
		error = 0;
	}
	return (error);
}

/* ARGSUSED */
static int
xattr_dir_access(vnode_t *vp, int mode, int flags, cred_t *cr,
    caller_context_t *ct)
{
	int error;
	vnode_t *realvp = NULL;

	if (mode & VWRITE) {
		return (EACCES);
	}

	error = xattr_dir_realdir(vp, &realvp, LOOKUP_XATTR, cr, ct);

	if (realvp)
		VN_RELE(realvp);

	/*
	 * No real xattr dir isn't an error
	 * an error of EINVAL indicates attributes on attributes
	 * are not supported.  In that case just allow access to the
	 * transient directory.
	 */
	return ((error == ENOENT || error == EINVAL) ? 0 : error);
}

static int
xattr_dir_create(vnode_t *dvp, char *name, vattr_t *vap, vcexcl_t excl,
    int mode, vnode_t **vpp, cred_t *cr, int flag, caller_context_t *ct,
    vsecattr_t *vsecp)
{
	vnode_t *pvp;
	int error;

	*vpp = NULL;

	/*
	 * Don't allow creation of extended attributes with sysattr names.
	 */
	if (is_sattr_name(name)) {
		return (gfs_dir_lookup(dvp, name, vpp, cr, 0, NULL, NULL));
	}

	error = xattr_dir_realdir(dvp, &pvp, LOOKUP_XATTR|CREATE_XATTR_DIR,
	    cr, ct);
	if (error == 0) {
		error = VOP_CREATE(pvp, name, vap, excl, mode, vpp, cr, flag,
		    ct, vsecp);
		VN_RELE(pvp);
	}
	return (error);
}

static int
xattr_dir_remove(vnode_t *dvp, char *name, cred_t *cr, caller_context_t *ct,
    int flags)
{
	vnode_t *pvp;
	int error;

	if (is_sattr_name(name)) {
		return (EACCES);
	}

	error = xattr_dir_realdir(dvp, &pvp, LOOKUP_XATTR, cr, ct);
	if (error == 0) {
		error = VOP_REMOVE(pvp, name, cr, ct, flags);
		VN_RELE(pvp);
	}
	return (error);
}

static int
xattr_dir_link(vnode_t *tdvp, vnode_t *svp, char *name, cred_t *cr,
    caller_context_t *ct, int flags)