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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 /*
     22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     23  * Use is subject to license terms.
     24  */
     25 
     26 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     27 
     28 #include <sys/types.h>
     29 #include <sys/param.h>
     30 #include <sys/time.h>
     31 #include <sys/cred.h>
     32 #include <sys/vfs.h>
     33 #include <sys/vfs_opreg.h>
     34 #include <sys/gfs.h>
     35 #include <sys/vnode.h>
     36 #include <sys/systm.h>
     37 #include <sys/errno.h>
     38 #include <sys/sysmacros.h>
     39 #include <fs/fs_subr.h>
     40 #include <sys/contract.h>
     41 #include <sys/contract_impl.h>
     42 #include <sys/ctfs.h>
     43 #include <sys/ctfs_impl.h>
     44 #include <sys/file.h>
     45 
     46 /*
     47  * CTFS routines for the /system/contract/<type>/latest vnode.
     48  */
     49 
     50 /*
     51  * ctfs_create_latenode
     52  */
     53 vnode_t *
     54 ctfs_create_latenode(vnode_t *pvp)
     55 {
     56 	return (gfs_file_create(sizeof (ctfs_latenode_t), pvp,
     57 	    ctfs_ops_latest));
     58 }
     59 
     60 /*
     61  * ctfs_latest_nested_open
     62  *
     63  * The latest node is just a doorway to the status file; this function
     64  * is used by ctfs_latest_access, ctfs_latest_open, and
     65  * ctfs_latest_getattr to obtain that file.
     66  */
     67 static vnode_t *
     68 ctfs_latest_nested_open(vnode_t *vp, cred_t *cr)
     69 {
     70 	contract_t *ct = ttolwp(curthread)->lwp_ct_latest[
     71 	    gfs_file_index(gfs_file_parent(vp))];
     72 
     73 	if (ct) {
     74 		vnode_t *cvp, *svp;
     75 
     76 		cvp = ctfs_create_cdirnode(gfs_file_parent(vp), ct);
     77 
     78 		gfs_file_set_index(cvp, -1);
     79 
     80 		VERIFY(gfs_dir_lookup(cvp, "status", &svp,
     81 		    cr, 0, NULL, NULL) == 0);
     82 
     83 		VN_RELE(cvp);
     84 
     85 		return (svp);
     86 	}
     87 
     88 	return (NULL);
     89 }
     90 
     91 /*
     92  * ctfs_latest_access - VOP_ACCESS entry point
     93  *
     94  * Fails if there isn't a latest contract.
     95  */
     96 /* ARGSUSED */
     97 static int
     98 ctfs_latest_access(
     99 	vnode_t *vp,
    100 	int mode,
    101 	int flags,
    102 	cred_t *cr,
    103 	caller_context_t *ct)
    104 {
    105 	vnode_t *nvp;
    106 
    107 	if (mode & (VEXEC | VWRITE))
    108 		return (EACCES);
    109 
    110 	if (nvp = ctfs_latest_nested_open(vp, cr)) {
    111 		VN_RELE(nvp);
    112 		return (0);
    113 	}
    114 
    115 	return (ESRCH);
    116 }
    117 
    118 /*
    119  * ctfs_latest_open - VOP_OPEN entry point
    120  *
    121  * After checking the mode bits, opens and returns the status file for
    122  * the LWP's latest contract.
    123  */
    124 static int
    125 ctfs_latest_open(vnode_t **vpp, int flag, cred_t *cr, caller_context_t *ct)
    126 {
    127 	vnode_t *nvp;
    128 
    129 	if (flag != (FREAD | FOFFMAX))
    130 		return (EINVAL);
    131 
    132 	if (nvp = ctfs_latest_nested_open(*vpp, cr)) {
    133 		VN_RELE(*vpp);
    134 		*vpp = nvp;
    135 		return (VOP_OPEN(vpp, flag, cr, ct));
    136 	}
    137 
    138 	return (ESRCH);
    139 }
    140 
    141 /*
    142  * ctfs_latest_getattr - the VOP_GETATTR entry point
    143  *
    144  * Fetches and calls VOP_GETATTR on the status file for the LWP's
    145  * latest contract.  Otherwise it fakes up something bland.
    146  */
    147 static int
    148 ctfs_latest_getattr(
    149 	vnode_t *vp,
    150 	vattr_t *vap,
    151 	int flags,
    152 	cred_t *cr,
    153 	caller_context_t *ct)
    154 {
    155 	vnode_t *nvp;
    156 
    157 	if (nvp = ctfs_latest_nested_open(vp, cr)) {
    158 		int res = VOP_GETATTR(nvp, vap, flags, cr, ct);
    159 		VN_RELE(nvp);
    160 		return (res);
    161 	}
    162 
    163 	vap->va_type = VREG;
    164 	vap->va_mode = 0444;
    165 	vap->va_nlink = 1;
    166 	vap->va_size = 0;
    167 	vap->va_ctime.tv_sec = vp->v_vfsp->vfs_mtime;
    168 	vap->va_ctime.tv_nsec = 0;
    169 	vap->va_atime = vap->va_mtime = vap->va_ctime;
    170 	ctfs_common_getattr(vp, vap);
    171 
    172 	return (0);
    173 }
    174 
    175 const fs_operation_def_t ctfs_tops_latest[] = {
    176 	{ VOPNAME_OPEN,		{ .vop_open = ctfs_latest_open } },
    177 	{ VOPNAME_CLOSE,	{ .error = fs_inval } },
    178 	{ VOPNAME_IOCTL,	{ .error = fs_inval } },
    179 	{ VOPNAME_GETATTR,	{ .vop_getattr = ctfs_latest_getattr } },
    180 	{ VOPNAME_ACCESS,	{ .vop_access = ctfs_latest_access } },
    181 	{ VOPNAME_READDIR,	{ .error = fs_notdir } },
    182 	{ VOPNAME_LOOKUP,	{ .error = fs_notdir } },
    183 	{ VOPNAME_INACTIVE,	{ .vop_inactive = gfs_vop_inactive } },
    184 	{ NULL, NULL }
    185 };
    186