sys/compat/common/vfs_syscalls_20.c

   1 /*      $NetBSD: vfs_syscalls_20.c,v 1.33 2008/11/20 09:22:57 ad Exp $  */
   2
   3 /*
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  * (c) UNIX System Laboratories, Inc.
   7  * All or some portions of this file are derived from material licensed
   8  * to the University of California by American Telephone and Telegraph
   9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  10  * the permission of UNIX System Laboratories, Inc.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)vfs_syscalls.c      8.42 (Berkeley) 7/31/95
  37  */
  38
  39 #include <sys/cdefs.h>
  40 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_20.c,v 1.33 2008/11/20 09:22:57 ad Exp $");
  41
  42 #ifdef _KERNEL_OPT
  43 #include "opt_compat_netbsd.h"
  44 #endif
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/namei.h>
  49 #include <sys/filedesc.h>
  50 #include <sys/kernel.h>
  51 #include <sys/file.h>
  52 #include <sys/stat.h>
  53 #include <sys/vnode.h>
  54 #include <sys/mount.h>
  55 #include <sys/proc.h>
  56 #include <sys/uio.h>
  57 #include <sys/malloc.h>
  58 #include <sys/dirent.h>
  59 #include <sys/sysctl.h>
  60 #include <sys/syscallargs.h>
  61 #include <sys/kauth.h>
  62
  63 #include <compat/sys/mount.h>
  64
  65 #define MOUNTNO_NONE    0
  66 #define MOUNTNO_UFS     1               /* UNIX "Fast" Filesystem */
  67 #define MOUNTNO_NFS     2               /* Network Filesystem */
  68 #define MOUNTNO_MFS     3               /* Memory Filesystem */
  69 #define MOUNTNO_MSDOS   4               /* MSDOS Filesystem */
  70 #define MOUNTNO_CD9660  5               /* iso9660 cdrom */
  71 #define MOUNTNO_FDESC   6               /* /dev/fd filesystem */
  72 #define MOUNTNO_KERNFS  7               /* kernel variable filesystem */
  73 #define MOUNTNO_DEVFS   8               /* device node filesystem */
  74 #define MOUNTNO_AFS     9               /* AFS 3.x */
  75 static const struct {
  76         const char *name;
  77         const int value;
  78 } nv[] = {
  79         { MOUNT_UFS, MOUNTNO_UFS },
  80         { MOUNT_NFS, MOUNTNO_NFS },
  81         { MOUNT_MFS, MOUNTNO_MFS },
  82         { MOUNT_MSDOS, MOUNTNO_MSDOS },
  83         { MOUNT_CD9660, MOUNTNO_CD9660 },
  84         { MOUNT_FDESC, MOUNTNO_FDESC },
  85         { MOUNT_KERNFS, MOUNTNO_KERNFS },
  86         { MOUNT_AFS, MOUNTNO_AFS },
  87 };
  88
  89 static int
  90 vfs2fs(struct statfs12 *bfs, const struct statvfs *fs)
  91 {
  92         struct statfs12 ofs;
  93         int i = 0;
  94         ofs.f_type = 0;
  95         ofs.f_oflags = (short)fs->f_flag;
  96
  97         for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) {
  98                 if (strcmp(nv[i].name, fs->f_fstypename) == 0) {
  99                         ofs.f_type = nv[i].value;
 100                         break;
 101                 }
 102         }
 103 #define CLAMP(a)        (long)(((a) & ~LONG_MAX) ? LONG_MAX : (a))
 104         ofs.f_bsize = CLAMP(fs->f_frsize);
 105         ofs.f_iosize = CLAMP(fs->f_iosize);
 106         ofs.f_blocks = CLAMP(fs->f_blocks);
 107         ofs.f_bfree = CLAMP(fs->f_bfree);
 108         if (fs->f_bfree > fs->f_bresvd)
 109                 ofs.f_bavail = CLAMP(fs->f_bfree - fs->f_bresvd);
 110         else
 111                 ofs.f_bavail = -CLAMP(fs->f_bresvd - fs->f_bfree);
 112         ofs.f_files = CLAMP(fs->f_files);
 113         ofs.f_ffree = CLAMP(fs->f_ffree);
 114         ofs.f_fsid = fs->f_fsidx;
 115         ofs.f_owner = fs->f_owner;
 116         ofs.f_flags = (long)fs->f_flag;
 117         ofs.f_syncwrites = CLAMP(fs->f_syncwrites);
 118         ofs.f_asyncwrites = CLAMP(fs->f_asyncwrites);
 119         (void)strncpy(ofs.f_fstypename, fs->f_fstypename,
 120             sizeof(ofs.f_fstypename));
 121         (void)strncpy(ofs.f_mntonname, fs->f_mntonname,
 122             sizeof(ofs.f_mntonname));
 123         (void)strncpy(ofs.f_mntfromname, fs->f_mntfromname,
 124             sizeof(ofs.f_mntfromname));
 125
 126         return copyout(&ofs, bfs, sizeof(ofs));
 127 }
 128
 129 /*
 130  * Get filesystem statistics.
 131  */
 132 /* ARGSUSED */
 133 int
 134 compat_20_sys_statfs(struct lwp *l, const struct compat_20_sys_statfs_args *uap, register_t *retval)
 135 {
 136         /* {
 137                 syscallarg(const char *) path;
 138                 syscallarg(struct statfs12 *) buf;
 139         } */
 140         struct mount *mp;
 141         struct statvfs *sbuf;
 142         int error = 0;
 143         struct vnode *vp;
 144
 145         error = namei_simple_user(SCARG(uap, path),
 146                         NSM_FOLLOW_TRYEMULROOT, &vp);
 147         if (error != 0)
 148                 return error;
 149
 150         mp = vp->v_mount;
 151
 152         sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
 153         if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
 154                 goto done;
 155
 156         error = vfs2fs(SCARG(uap, buf), sbuf);
 157 done:
 158         vrele(vp);
 159         free(sbuf, M_TEMP);
 160         return error;
 161 }
 162
 163 /*
 164  * Get filesystem statistics.
 165  */
 166 /* ARGSUSED */
 167 int
 168 compat_20_sys_fstatfs(struct lwp *l, const struct compat_20_sys_fstatfs_args *uap, register_t *retval)
 169 {
 170         /* {
 171                 syscallarg(int) fd;
 172                 syscallarg(struct statfs12 *) buf;
 173         } */
 174         struct file *fp;
 175         struct mount *mp;
 176         struct statvfs *sbuf;
 177         int error;
 178
 179         /* fd_getvnode() will use the descriptor for us */
 180         if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
 181                 return (error);
 182         mp = ((struct vnode *)fp->f_data)->v_mount;
 183         sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
 184         if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
 185                 goto out;
 186         error = vfs2fs(SCARG(uap, buf), sbuf);
 187  out:
 188         fd_putfile(SCARG(uap, fd));
 189         free(sbuf, M_TEMP);
 190         return error;
 191 }
 192
 193
 194 /*
 195  * Get statistics on all filesystems.
 196  */
 197 int
 198 compat_20_sys_getfsstat(struct lwp *l, const struct compat_20_sys_getfsstat_args *uap, register_t *retval)
 199 {
 200         /* {
 201                 syscallarg(struct statfs12 *) buf;
 202                 syscallarg(long) bufsize;
 203                 syscallarg(int) flags;
 204         } */
 205         int root = 0;
 206         struct mount *mp, *nmp;
 207         struct statvfs *sbuf;
 208         struct statfs12 *sfsp;
 209         size_t count, maxcount;
 210         int error = 0;
 211
 212         sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
 213         maxcount = (size_t)SCARG(uap, bufsize) / sizeof(struct statfs12);
 214         sfsp = SCARG(uap, buf);
 215         mutex_enter(&mountlist_lock);
 216         count = 0;
 217         for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist;
 218              mp = nmp) {
 219                 if (vfs_busy(mp, &nmp)) {
 220                         continue;
 221                 }
 222                 if (sfsp && count < maxcount) {
 223                         error = dostatvfs(mp, sbuf, l, SCARG(uap, flags), 0);
 224                         if (error) {
 225                                 vfs_unbusy(mp, false, &nmp);
 226                                 continue;
 227                         }
 228                         error = vfs2fs(sfsp, sbuf);
 229                         if (error) {
 230                                 vfs_unbusy(mp, false, NULL);
 231                                 goto out;
 232                         }
 233                         sfsp++;
 234                         root |= strcmp(sbuf->f_mntonname, "/") == 0;
 235                 }
 236                 count++;
 237                 vfs_unbusy(mp, false, &nmp);
 238         }
 239         mutex_exit(&mountlist_lock);
 240         if (root == 0 && l->l_proc->p_cwdi->cwdi_rdir) {
 241                 /*
 242                  * fake a root entry
 243                  */
 244                 if ((error = dostatvfs(l->l_proc->p_cwdi->cwdi_rdir->v_mount,
 245                                        sbuf, l, SCARG(uap, flags), 1)) != 0)
 246                         goto out;
 247                 if (sfsp)
 248                         error = vfs2fs(sfsp, sbuf);
 249                 count++;
 250         }
 251         if (sfsp && count > maxcount)
 252                 *retval = maxcount;
 253         else
 254                 *retval = count;
 255 out:
 256         free(sbuf, M_TEMP);
 257         return error;
 258 }
 259
 260 int
 261 compat_20_sys_fhstatfs(struct lwp *l, const struct compat_20_sys_fhstatfs_args *uap, register_t *retval)
 262 {
 263         /* {
 264                 syscallarg(const struct compat_30_fhandle *) fhp;
 265                 syscallarg(struct statfs12 *) buf;
 266         } */
 267         struct statvfs *sbuf;
 268         struct compat_30_fhandle fh;
 269         struct mount *mp;
 270         struct vnode *vp;
 271         int error;
 272
 273         /*
 274          * Must be super user
 275          */
 276         if ((error = kauth_authorize_system(l->l_cred,
 277             KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL)))
 278                 return (error);
 279
 280         if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0)
 281                 return (error);
 282
 283         if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
 284                 return (ESTALE);
 285         if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp)))
 286                 return (error);
 287         mp = vp->v_mount;
 288         VOP_UNLOCK(vp, 0);
 289         sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
 290         if ((error = VFS_STATVFS(mp, sbuf)) != 0)
 291                 goto out;
 292         error = vfs2fs(SCARG(uap, buf), sbuf);
 293 out:
 294         vrele(vp);
 295         free(sbuf, M_TEMP);
 296         return error;
 297 }