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