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 2007 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) 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) == 0); 81 82 VN_RELE(cvp); 83 84 return (svp); 85 } 86 87 return (NULL); 88 } 89 90 /* 91 * ctfs_latest_access - VOP_ACCESS entry point 92 * 93 * Fails if there isn't a latest contract. 94 */ 95 /* ARGSUSED */ 96 static int 97 ctfs_latest_access(vnode_t *vp, int mode, int flags, cred_t *cr) 98 { 99 vnode_t *nvp; 100 101 if (mode & (VEXEC | VWRITE)) 102 return (EACCES); 103 104 if (nvp = ctfs_latest_nested_open(vp)) { 105 VN_RELE(nvp); 106 return (0); 107 } 108 109 return (ESRCH); 110 } 111 112 /* 113 * ctfs_latest_open - VOP_OPEN entry point 114 * 115 * After checking the mode bits, opens and returns the status file for 116 * the LWP's latest contract. 117 */ 118 static int 119 ctfs_latest_open(vnode_t **vpp, int flag, cred_t *cr) 120 { 121 vnode_t *nvp; 122 123 if (flag != (FREAD | FOFFMAX)) 124 return (EINVAL); 125 126 if (nvp = ctfs_latest_nested_open(*vpp)) { 127 VN_RELE(*vpp); 128 *vpp = nvp; 129 return (VOP_OPEN(vpp, flag, cr)); 130 } 131 132 return (ESRCH); 133 } 134 135 /* 136 * ctfs_latest_getattr - the VOP_GETATTR entry point 137 * 138 * Fetches and calls VOP_GETATTR on the status file for the LWP's 139 * latest contract. Otherwise it fakes up something bland. 140 */ 141 static int 142 ctfs_latest_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr) 143 { 144 vnode_t *nvp; 145 146 if (nvp = ctfs_latest_nested_open(vp)) { 147 int res = VOP_GETATTR(nvp, vap, flags, cr); 148 VN_RELE(nvp); 149 return (res); 150 } 151 152 vap->va_type = VREG; 153 vap->va_mode = 0444; 154 vap->va_nlink = 1; 155 vap->va_size = 0; 156 vap->va_ctime.tv_sec = vp->v_vfsp->vfs_mtime; 157 vap->va_ctime.tv_nsec = 0; 158 vap->va_atime = vap->va_mtime = vap->va_ctime; 159 ctfs_common_getattr(vp, vap); 160 161 return (0); 162 } 163 164 const fs_operation_def_t ctfs_tops_latest[] = { 165 { VOPNAME_OPEN, { .vop_open = ctfs_latest_open } }, 166 { VOPNAME_CLOSE, { .error = fs_inval } }, 167 { VOPNAME_IOCTL, { .error = fs_inval } }, 168 { VOPNAME_GETATTR, { .vop_getattr = ctfs_latest_getattr } }, 169 { VOPNAME_ACCESS, { .vop_access = ctfs_latest_access } }, 170 { VOPNAME_READDIR, { .error = fs_notdir } }, 171 { VOPNAME_LOOKUP, { .error = fs_notdir } }, 172 { VOPNAME_INACTIVE, { .vop_inactive = gfs_vop_inactive } }, 173 { NULL, NULL } 174 }; 175