kernel/syscall/utime.c

   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 /*
  23  * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
  24  */
  25
  26 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  27 /*        All Rights Reserved   */
  28
  29 /*
  30  * Portions of this source code were derived from Berkeley 4.3 BSD
  31  * under license from the Regents of the University of California.
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/isa_defs.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <sys/sysmacros.h>
  39 #include <sys/systm.h>
  40 #include <sys/errno.h>
  41 #include <sys/vnode.h>
  42 #include <sys/vfs.h>
  43 #include <sys/time.h>
  44 #include <sys/debug.h>
  45 #include <sys/model.h>
  46 #include <sys/fcntl.h>
  47 #include <sys/file.h>
  48 #include <sys/pathname.h>
  49 #include <c2/audit.h>
  50
  51 static int
  52 cfutimesat(int fd, char *fname, int nmflag, vattr_t *vap, int flags, int follow)
  53 {
  54         file_t *fp;
  55         vnode_t *startvp, *vp;
  56         int error;
  57         char startchar;
  58
  59         if (fd == AT_FDCWD && fname == NULL)
  60                 return (set_errno(EFAULT));
  61
  62         if (nmflag == 1 || (nmflag == 2 && fname != NULL)) {
  63                 if (copyin(fname, &startchar, sizeof (char)))
  64                         return (set_errno(EFAULT));
  65         } else {
  66                 startchar = '\0';
  67         }
  68
  69         if (fd == AT_FDCWD) {
  70                 startvp = NULL;
  71         } else {
  72                 /*
  73                  * is this absolute path?
  74                  */
  75                 if (startchar != '/') {
  76                         if ((fp = getf(fd)) == NULL)
  77                                 return (set_errno(EBADF));
  78                         startvp = fp->f_vnode;
  79                         VN_HOLD(startvp);
  80                         releasef(fd);
  81                 } else {
  82                         startvp = NULL;
  83                 }
  84         }
  85
  86         if ((nmflag == 1) || ((nmflag == 2) && (fname != NULL))) {
  87                 if (AU_AUDITING() && startvp != NULL)
  88                         audit_setfsat_path(1);
  89                 if ((error = lookupnameat(fname, UIO_USERSPACE,
  90                     follow, NULLVPP, &vp, startvp)) != 0) {
  91                         if (startvp != NULL)
  92                                 VN_RELE(startvp);
  93                         return (set_errno(error));
  94                 }
  95         } else {
  96                 vp = startvp;
  97                 VN_HOLD(vp);
  98         }
  99
 100         if (startvp != NULL) {
 101                 VN_RELE(startvp);
 102         }
 103
 104         if (vn_is_readonly(vp)) {
 105                 error = EROFS;
 106         } else {
 107                 error = fop_setattr(vp, vap, flags, CRED(), NULL);
 108         }
 109
 110         VN_RELE(vp);
 111         if (error != 0)
 112                 return (set_errno(error));
 113         return (0);
 114 }
 115
 116 static int
 117 get_timespec_vattr(timespec_t *tsptr, struct vattr *vattr, int *flags)
 118 {
 119         timespec_t ts[2];
 120         timespec_t now;
 121         uint_t mask;
 122
 123         if (tsptr != NULL) {
 124                 if (get_udatamodel() == DATAMODEL_NATIVE) {
 125                         if (copyin(tsptr, ts, sizeof (ts)))
 126                                 return (EFAULT);
 127                 } else {
 128                         timespec32_t ts32[2];
 129
 130                         if (copyin(tsptr, ts32, sizeof (ts32)))
 131                                 return (EFAULT);
 132                         TIMESPEC32_TO_TIMESPEC(&ts[0], &ts32[0]);
 133                         TIMESPEC32_TO_TIMESPEC(&ts[1], &ts32[1]);
 134                 }
 135                 if (ts[0].tv_nsec == UTIME_NOW || ts[1].tv_nsec == UTIME_NOW)
 136                         gethrestime(&now);
 137                 mask = 0;
 138                 if (ts[0].tv_nsec == UTIME_OMIT) {
 139                         ts[0].tv_nsec = 0;
 140                 } else {
 141                         mask |= AT_ATIME;
 142                         if (ts[0].tv_nsec == UTIME_NOW)
 143                                 ts[0] = now;
 144                         else if (ts[0].tv_nsec < 0 || ts[0].tv_nsec >= NANOSEC)
 145                                 return (EINVAL);
 146                 }
 147                 if (ts[1].tv_nsec == UTIME_OMIT) {
 148                         ts[1].tv_nsec = 0;
 149                 } else {
 150                         mask |= AT_MTIME;
 151                         if (ts[1].tv_nsec == UTIME_NOW)
 152                                 ts[1] = now;
 153                         else if (ts[1].tv_nsec < 0 || ts[1].tv_nsec >= NANOSEC)
 154                                 return (EINVAL);
 155                 }
 156                 vattr->va_atime = ts[0];
 157                 vattr->va_mtime = ts[1];
 158                 vattr->va_mask = mask;
 159                 *flags = ATTR_UTIME;
 160         } else {
 161                 gethrestime(&now);
 162                 vattr->va_atime = now;
 163                 vattr->va_mtime = now;
 164                 vattr->va_mask = AT_ATIME | AT_MTIME;
 165                 *flags = 0;
 166         }
 167
 168         return (0);
 169 }
 170
 171 int
 172 futimens(int fd, timespec_t *tsptr)
 173 {
 174         struct vattr vattr;
 175         int flags;
 176         int error;
 177
 178         if ((error = get_timespec_vattr(tsptr, &vattr, &flags)) != 0)
 179                 return (set_errno(error));
 180
 181         return (cfutimesat(fd, NULL, 2, &vattr, flags, FOLLOW));
 182 }
 183
 184 int
 185 utimensat(int fd, char *fname, timespec_t *tsptr, int flag)
 186 {
 187         struct vattr vattr;
 188         int flags;
 189         int error;
 190
 191         if ((error = get_timespec_vattr(tsptr, &vattr, &flags)) != 0)
 192                 return (set_errno(error));
 193
 194         return (cfutimesat(fd, fname, 1, &vattr, flags,
 195             (flag & AT_SYMLINK_NOFOLLOW)? NO_FOLLOW : FOLLOW));
 196 }
 197
 198 int
 199 utimesys(int code,
 200     uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
 201 {
 202         switch (code) {
 203         case 0:
 204                 return (futimens((int)arg1, (timespec_t *)arg2));
 205         case 1:
 206                 return (utimensat((int)arg1, (char *)arg2,
 207                     (timespec_t *)arg3, (int)arg4));
 208         default:
 209                 return (set_errno(EINVAL));
 210         }
 211 }