sys/miscfs/procfs/procfs_linux.c

   1 /*      $NetBSD: procfs_linux.c,v 1.57 2009/01/11 03:16:33 christos Exp $      */
   2
   3 /*
   4  * Copyright (c) 2001 Wasabi Systems, Inc.
   5  * All rights reserved.
   6  *
   7  * Written by Frank van der Linden for Wasabi Systems, Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed for the NetBSD Project by
  20  *      Wasabi Systems, Inc.
  21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
  22  *    or promote products derived from this software without specific prior
  23  *    written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
  29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <sys/cdefs.h>
  39 __KERNEL_RCSID(0, "$NetBSD: procfs_linux.c,v 1.57 2009/01/11 03:16:33 christos Exp $");
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/time.h>
  44 #include <sys/kernel.h>
  45 #include <sys/proc.h>
  46 #include <sys/vnode.h>
  47 #include <sys/exec.h>
  48 #include <sys/resource.h>
  49 #include <sys/resourcevar.h>
  50 #include <sys/signal.h>
  51 #include <sys/signalvar.h>
  52 #include <sys/tty.h>
  53 #include <sys/malloc.h>
  54 #include <sys/mount.h>
  55 #include <sys/conf.h>
  56
  57 #include <miscfs/procfs/procfs.h>
  58
  59 #include <compat/linux/common/linux_exec.h>
  60
  61 #include <uvm/uvm_extern.h>
  62 #include <uvm/uvm.h>
  63
  64 extern struct devsw_conv *devsw_conv;
  65 extern int max_devsw_convs;
  66
  67 #define PGTOB(p)        ((unsigned long)(p) << PAGE_SHIFT)
  68 #define PGTOKB(p)       ((unsigned long)(p) << (PAGE_SHIFT - 10))
  69
  70 #define LBFSZ (8 * 1024)
  71
  72 static void
  73 get_proc_size_info(struct lwp *l, unsigned long *stext, unsigned long *etext, unsigned long *sstack)
  74 {
  75         struct proc *p = l->l_proc;
  76         struct vmspace *vm;
  77         struct vm_map *map;
  78         struct vm_map_entry *entry;
  79
  80         *stext = 0;
  81         *etext = 0;
  82         *sstack = 0;
  83
  84         proc_vmspace_getref(p, &vm);
  85         map = &vm->vm_map;
  86         vm_map_lock_read(map);
  87
  88         for (entry = map->header.next; entry != &map->header;
  89             entry = entry->next) {
  90                 if (UVM_ET_ISSUBMAP(entry))
  91                         continue;
  92                 /* assume text is the first entry */
  93                 if (*stext == *etext) {
  94                         *stext = entry->start;
  95                         *etext = entry->end;
  96                         break;
  97                 }
  98         }
  99 #ifdef LINUX_USRSTACK32
 100         if (strcmp(p->p_emul->e_name, "linux32") == 0 &&
 101             LINUX_USRSTACK32 < USRSTACK32)
 102                 *sstack = (unsigned long)LINUX_USRSTACK32;
 103         else
 104 #endif
 105 #ifdef LINUX_USRSTACK
 106         if (strcmp(p->p_emul->e_name, "linux") == 0 &&
 107             LINUX_USRSTACK < USRSTACK)
 108                 *sstack = (unsigned long)LINUX_USRSTACK;
 109         else
 110 #endif
 111 #ifdef  USRSTACK32
 112         if (strstr(p->p_emul->e_name, "32") != NULL)
 113                 *sstack = (unsigned long)USRSTACK32;
 114         else
 115 #endif
 116                 *sstack = (unsigned long)USRSTACK;
 117
 118         /*
 119          * jdk 1.6 compares low <= addr && addr < high
 120          * if we put addr == high, then the test fails
 121          * so eat one page.
 122          */
 123         *sstack -= PAGE_SIZE;
 124
 125         vm_map_unlock_read(map);
 126         uvmspace_free(vm);
 127 }
 128
 129 /*
 130  * Linux compatible /proc/meminfo. Only active when the -o linux
 131  * mountflag is used.
 132  */
 133 int
 134 procfs_domeminfo(struct lwp *curl, struct proc *p,
 135     struct pfsnode *pfs, struct uio *uio)
 136 {
 137         char *bf;
 138         int len;
 139         int error = 0;
 140
 141         bf = malloc(LBFSZ, M_TEMP, M_WAITOK);
 142
 143         len = snprintf(bf, LBFSZ,
 144                 "        total:    used:    free:  shared: buffers: cached:\n"
 145                 "Mem:  %8lu %8lu %8lu %8lu %8lu %8lu\n"
 146                 "Swap: %8lu %8lu %8lu\n"
 147                 "MemTotal:  %8lu kB\n"
 148                 "MemFree:   %8lu kB\n"
 149                 "MemShared: %8lu kB\n"
 150                 "Buffers:   %8lu kB\n"
 151                 "Cached:    %8lu kB\n"
 152                 "SwapTotal: %8lu kB\n"
 153                 "SwapFree:  %8lu kB\n",
 154                 PGTOB(uvmexp.npages),
 155                 PGTOB(uvmexp.npages - uvmexp.free),
 156                 PGTOB(uvmexp.free),
 157                 0L,
 158                 PGTOB(uvmexp.filepages),
 159                 PGTOB(uvmexp.anonpages + uvmexp.filepages + uvmexp.execpages),
 160                 PGTOB(uvmexp.swpages),
 161                 PGTOB(uvmexp.swpginuse),
 162                 PGTOB(uvmexp.swpages - uvmexp.swpginuse),
 163                 PGTOKB(uvmexp.npages),
 164                 PGTOKB(uvmexp.free),
 165                 0L,
 166                 PGTOKB(uvmexp.filepages),
 167                 PGTOKB(uvmexp.anonpages + uvmexp.filepages + uvmexp.execpages),
 168                 PGTOKB(uvmexp.swpages),
 169                 PGTOKB(uvmexp.swpages - uvmexp.swpginuse));
 170
 171         if (len == 0)
 172                 goto out;
 173
 174         error = uiomove_frombuf(bf, len, uio);
 175 out:
 176         free(bf, M_TEMP);
 177         return error;
 178 }
 179
 180 /*
 181  * Linux compatible /proc/devices. Only active when the -o linux
 182  * mountflag is used.
 183  */
 184 int
 185 procfs_dodevices(struct lwp *curl, struct proc *p,
 186     struct pfsnode *pfs, struct uio *uio)
 187 {
 188         char *bf;
 189         int offset = 0;
 190         int i, error = ENAMETOOLONG;
 191
 192         /* XXX elad - may need filtering. */
 193
 194         bf = malloc(LBFSZ, M_TEMP, M_WAITOK);
 195
 196         offset += snprintf(&bf[offset], LBFSZ - offset, "Character devices:\n");
 197         if (offset >= LBFSZ)
 198                 goto out;
 199
 200         mutex_enter(&device_lock);
 201         for (i = 0; i < max_devsw_convs; i++) {
 202                 if ((devsw_conv[i].d_name == NULL) ||
 203                     (devsw_conv[i].d_cmajor == -1))
 204                         continue;
 205
 206                 offset += snprintf(&bf[offset], LBFSZ - offset,
 207                     "%3d %s\n", devsw_conv[i].d_cmajor, devsw_conv[i].d_name);
 208                 if (offset >= LBFSZ) {
 209                         mutex_exit(&device_lock);
 210                         goto out;
 211                 }
 212         }
 213
 214         offset += snprintf(&bf[offset], LBFSZ - offset, "\nBlock devices:\n");
 215         if (offset >= LBFSZ) {
 216                 mutex_exit(&device_lock);
 217                 goto out;
 218         }
 219
 220         for (i = 0; i < max_devsw_convs; i++) {
 221                 if ((devsw_conv[i].d_name == NULL) ||
 222                     (devsw_conv[i].d_bmajor == -1))
 223                         continue;
 224
 225                 offset += snprintf(&bf[offset], LBFSZ - offset,
 226                     "%3d %s\n", devsw_conv[i].d_bmajor, devsw_conv[i].d_name);
 227                 if (offset >= LBFSZ) {
 228                         mutex_exit(&device_lock);
 229                         goto out;
 230                 }
 231         }
 232         mutex_exit(&device_lock);
 233
 234         error = uiomove_frombuf(bf, offset, uio);
 235 out:
 236         free(bf, M_TEMP);
 237         return error;
 238 }
 239
 240 /*
 241  * Linux compatible /proc/stat. Only active when the -o linux
 242  * mountflag is used.
 243  */
 244 int
 245 procfs_docpustat(struct lwp *curl, struct proc *p,
 246     struct pfsnode *pfs, struct uio *uio)
 247 {
 248         char            *bf;
 249         int              error;
 250         int              len;
 251 #if defined(MULTIPROCESSOR)
 252         struct cpu_info *ci;
 253         CPU_INFO_ITERATOR cii;
 254 #endif
 255         int              i;
 256
 257         error = ENAMETOOLONG;
 258         bf = malloc(LBFSZ, M_TEMP, M_WAITOK);
 259
 260         len = snprintf(bf, LBFSZ,
 261                 "cpu %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
 262                 curcpu()->ci_schedstate.spc_cp_time[CP_USER],
 263                 curcpu()->ci_schedstate.spc_cp_time[CP_NICE],
 264                 curcpu()->ci_schedstate.spc_cp_time[CP_SYS] /*+ [CP_INTR]*/,
 265                 curcpu()->ci_schedstate.spc_cp_time[CP_IDLE]);
 266         if (len == 0)
 267                 goto out;
 268
 269 #if defined(MULTIPROCESSOR)
 270 #define ALLCPUS CPU_INFO_FOREACH(cii, ci)
 271 #define CPUNAME ci
 272 #else
 273 #define ALLCPUS ; i < 1 ;
 274 #define CPUNAME curcpu()
 275 #endif
 276
 277         i = 0;
 278         for (ALLCPUS) {
 279                 len += snprintf(&bf[len], LBFSZ - len,
 280                         "cpu%d %" PRIu64 " %" PRIu64 " %" PRIu64 " %" PRIu64
 281                         "\n", i,
 282                         CPUNAME->ci_schedstate.spc_cp_time[CP_USER],
 283                         CPUNAME->ci_schedstate.spc_cp_time[CP_NICE],
 284                         CPUNAME->ci_schedstate.spc_cp_time[CP_SYS],
 285                         CPUNAME->ci_schedstate.spc_cp_time[CP_IDLE]);
 286                 if (len >= LBFSZ)
 287                         goto out;
 288                 i += 1;
 289         }
 290
 291         len += snprintf(&bf[len], LBFSZ - len,
 292                         "disk 0 0 0 0\n"
 293                         "page %u %u\n"
 294                         "swap %u %u\n"
 295                         "intr %u\n"
 296                         "ctxt %u\n"
 297                         "btime %lld\n",
 298                         uvmexp.pageins, uvmexp.pdpageouts,
 299                         uvmexp.pgswapin, uvmexp.pgswapout,
 300                         uvmexp.intrs,
 301                         uvmexp.swtch,
 302                         (long long)boottime.tv_sec);
 303         if (len >= LBFSZ)
 304                 goto out;
 305
 306         error = uiomove_frombuf(bf, len, uio);
 307 out:
 308         free(bf, M_TEMP);
 309         return error;
 310 }
 311
 312 /*
 313  * Linux compatible /proc/loadavg. Only active when the -o linux
 314  * mountflag is used.
 315  */
 316 int
 317 procfs_doloadavg(struct lwp *curl, struct proc *p,
 318     struct pfsnode *pfs, struct uio *uio)
 319 {
 320         char    *bf;
 321         int      error;
 322         int      len;
 323
 324         error = ENAMETOOLONG;
 325         bf = malloc(LBFSZ, M_TEMP, M_WAITOK);
 326
 327         averunnable.fscale = FSCALE;
 328         len = snprintf(bf, LBFSZ,
 329                 "%d.%02d %d.%02d %d.%02d %d/%d %d\n",
 330                 (int)(averunnable.ldavg[0] / averunnable.fscale),
 331                 (int)(averunnable.ldavg[0] * 100 / averunnable.fscale % 100),
 332                 (int)(averunnable.ldavg[1] / averunnable.fscale),
 333                 (int)(averunnable.ldavg[1] * 100 / averunnable.fscale % 100),
 334                 (int)(averunnable.ldavg[2] / averunnable.fscale),
 335                 (int)(averunnable.ldavg[2] * 100 / averunnable.fscale % 100),
 336                 1,              /* number of ONPROC processes */
 337                 nprocs,
 338                 30000);         /* last pid */
 339         if (len == 0)
 340                 goto out;
 341
 342         error = uiomove_frombuf(bf, len, uio);
 343 out:
 344         free(bf, M_TEMP);
 345         return error;
 346 }
 347
 348 /*
 349  * Linux compatible /proc/<pid>/statm. Only active when the -o linux
 350  * mountflag is used.
 351  */
 352 int
 353 procfs_do_pid_statm(struct lwp *curl, struct lwp *l,
 354     struct pfsnode *pfs, struct uio *uio)
 355 {
 356         struct vmspace  *vm;
 357         struct proc     *p = l->l_proc;
 358         struct rusage   *ru = &p->p_stats->p_ru;
 359         char            *bf;
 360         int              error;
 361         int              len;
 362
 363         error = ENAMETOOLONG;
 364         bf = malloc(LBFSZ, M_TEMP, M_WAITOK);
 365
 366         /* XXX - we use values from vmspace, since dsl says that ru figures
 367            are always 0 except for zombies. See kvm_proc.c::kvm_getproc2() */
 368         if ((error = proc_vmspace_getref(p, &vm)) != 0) {
 369                 goto out;
 370         }
 371
 372         len = snprintf(bf, LBFSZ,
 373                 "%lu %lu %lu %lu %lu %lu %lu\n",
 374                 (unsigned long)(vm->vm_tsize + vm->vm_dsize + vm->vm_ssize), /* size */
 375                 (unsigned long)(vm->vm_rssize), /* resident */
 376                 (unsigned long)(ru->ru_ixrss),  /* shared */
 377                 (unsigned long)(vm->vm_tsize),  /* text size in pages */
 378                 (unsigned long)(vm->vm_dsize),  /* data size in pages */
 379                 (unsigned long)(vm->vm_ssize),  /* stack size in pages */
 380                 (unsigned long) 0);
 381
 382         uvmspace_free(vm);
 383
 384         if (len == 0)
 385                 goto out;
 386
 387         error = uiomove_frombuf(bf, len, uio);
 388 out:
 389         free(bf, M_TEMP);
 390         return error;
 391 }
 392
 393 #define USEC_2_TICKS(x)         ((x) / 10000)
 394
 395 /*
 396  * Linux compatible /proc/<pid>/stat. Only active when the -o linux
 397  * mountflag is used.
 398  */
 399 int
 400 procfs_do_pid_stat(struct lwp *curl, struct lwp *l,
 401     struct pfsnode *pfs, struct uio *uio)
 402 {
 403         char *bf;
 404         struct proc *p = l->l_proc;
 405         int len;
 406         struct tty *tty = p->p_session->s_ttyp;
 407         struct rusage *ru = &p->p_stats->p_ru;
 408         struct rusage *cru = &p->p_stats->p_cru;
 409         unsigned long stext = 0, etext = 0, sstack = 0;
 410         struct timeval rt;
 411         struct vmspace  *vm;
 412         int error = 0;
 413
 414         bf = malloc(LBFSZ, M_TEMP, M_WAITOK);
 415
 416         if ((error = proc_vmspace_getref(p, &vm)) != 0) {
 417                 goto out;
 418         }
 419
 420         get_proc_size_info(l, &stext, &etext, &sstack);
 421
 422         mutex_enter(proc_lock);
 423         mutex_enter(p->p_lock);
 424
 425         calcru(p, NULL, NULL, NULL, &rt);
 426
 427         len = snprintf(bf, LBFSZ,
 428             "%d (%s) %c %d %d %d %lld %d "
 429             "%u "
 430             "%lu %lu %lu %lu %lu %lu %lu %lu "
 431             "%d %d %d "
 432             "%lld %lld %lu %lu %" PRIu64 " "
 433             "%lu %lu %lu "
 434             "%u %u "
 435             "%u %u %u %u "
 436             "%lu %lu %lu %d %d\n",
 437
 438             p->p_pid,
 439             p->p_comm,
 440             "0IR3SZD"[(p->p_stat > 6) ? 0 : (int)p->p_stat],
 441             (p->p_pptr != NULL) ? p->p_pptr->p_pid : 0,
 442
 443             p->p_pgid,
 444             p->p_session->s_sid,
 445             (unsigned long long)(tty ? tty->t_dev : 0),
 446             (tty && tty->t_pgrp) ? tty->t_pgrp->pg_id : 0,
 447
 448             p->p_flag,
 449
 450             ru->ru_minflt,
 451             cru->ru_minflt,
 452             ru->ru_majflt,
 453             cru->ru_majflt,
 454             (long)USEC_2_TICKS(ru->ru_utime.tv_usec),
 455             (long)USEC_2_TICKS(ru->ru_stime.tv_usec),
 456             (long)USEC_2_TICKS(cru->ru_utime.tv_usec),
 457             (long)USEC_2_TICKS(cru->ru_stime.tv_usec),
 458
 459             l->l_priority,                              /* XXX: priority */
 460             p->p_nice - 20,
 461             0,
 462
 463             (long long)rt.tv_sec,
 464             (long long)p->p_stats->p_start.tv_sec,
 465             (unsigned long)(vm->vm_tsize + vm->vm_dsize + vm->vm_ssize), /* size */
 466             (unsigned long)(vm->vm_rssize),     /* resident */
 467             p->p_rlimit[RLIMIT_RSS].rlim_cur,
 468
 469             stext,                                      /* start code */
 470             etext,                                      /* end code */
 471             sstack,                                     /* mm start stack */
 472             0,                                          /* XXX: pc */
 473             0,                                          /* XXX: sp */
 474             p->p_sigpend.sp_set.__bits[0],              /* XXX: pending */
 475             0,                                          /* XXX: held */
 476             p->p_sigctx.ps_sigignore.__bits[0],         /* ignored */
 477             p->p_sigctx.ps_sigcatch.__bits[0],          /* caught */
 478
 479             (unsigned long)(intptr_t)l->l_wchan,
 480             ru->ru_nvcsw,
 481             ru->ru_nivcsw,
 482             p->p_exitsig,
 483             0);                                         /* XXX: processor */
 484
 485         mutex_exit(p->p_lock);
 486         mutex_exit(proc_lock);
 487
 488         uvmspace_free(vm);
 489
 490         if (len == 0)
 491                 goto out;
 492
 493         error = uiomove_frombuf(bf, len, uio);
 494 out:
 495         free(bf, M_TEMP);
 496         return error;
 497 }
 498
 499 int
 500 procfs_docpuinfo(struct lwp *curl, struct proc *p,
 501     struct pfsnode *pfs, struct uio *uio)
 502 {
 503         int len = LBFSZ;
 504         char *bf = malloc(len, M_TEMP, M_WAITOK);
 505         int error;
 506
 507         if (procfs_getcpuinfstr(bf, &len) < 0) {
 508                 error = ENOSPC;
 509                 goto done;
 510         }
 511
 512         if (len == 0) {
 513                 error = 0;
 514                 goto done;
 515         }
 516
 517         error = uiomove_frombuf(bf, len, uio);
 518 done:
 519         free(bf, M_TEMP);
 520         return error;
 521 }
 522
 523 int
 524 procfs_douptime(struct lwp *curl, struct proc *p,
 525     struct pfsnode *pfs, struct uio *uio)
 526 {
 527         char *bf;
 528         int len;
 529         struct timeval runtime;
 530         u_int64_t idle;
 531         int error = 0;
 532
 533         bf = malloc(LBFSZ, M_TEMP, M_WAITOK);
 534
 535         microuptime(&runtime);
 536         idle = curcpu()->ci_schedstate.spc_cp_time[CP_IDLE];
 537         len = snprintf(bf, LBFSZ,
 538             "%lld.%02lu %" PRIu64 ".%02" PRIu64 "\n",
 539             (long long)runtime.tv_sec, (long)runtime.tv_usec / 10000,
 540             idle / hz, (((idle % hz) * 100) / hz) % 100);
 541
 542         if (len == 0)
 543                 goto out;
 544
 545         error = uiomove_frombuf(bf, len, uio);
 546 out:
 547         free(bf, M_TEMP);
 548         return error;
 549 }
 550
 551 int
 552 procfs_domounts(struct lwp *curl, struct proc *p,
 553     struct pfsnode *pfs, struct uio *uio)
 554 {
 555         char *bf, *mtab = NULL;
 556         const char *fsname;
 557         size_t len, mtabsz = 0;
 558         struct mount *mp, *nmp;
 559         struct statvfs *sfs;
 560         int error = 0;
 561
 562         bf = malloc(LBFSZ, M_TEMP, M_WAITOK);
 563         mutex_enter(&mountlist_lock);
 564         for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist;
 565              mp = nmp) {
 566                 if (vfs_busy(mp, &nmp)) {
 567                         continue;
 568                 }
 569
 570                 sfs = &mp->mnt_stat;
 571
 572                 /* Linux uses different names for some filesystems */
 573                 fsname = sfs->f_fstypename;
 574                 if (strcmp(fsname, "procfs") == 0)
 575                         fsname = "proc";
 576                 else if (strcmp(fsname, "ext2fs") == 0)
 577                         fsname = "ext2";
 578
 579                 len = snprintf(bf, LBFSZ, "%s %s %s %s%s%s%s%s%s 0 0\n",
 580                         sfs->f_mntfromname,
 581                         sfs->f_mntonname,
 582                         fsname,
 583                         (mp->mnt_flag & MNT_RDONLY) ? "ro" : "rw",
 584                         (mp->mnt_flag & MNT_NOSUID) ? ",nosuid" : "",
 585                         (mp->mnt_flag & MNT_NOEXEC) ? ",noexec" : "",
 586                         (mp->mnt_flag & MNT_NODEV) ? ",nodev" : "",
 587                         (mp->mnt_flag & MNT_SYNCHRONOUS) ? ",sync" : "",
 588                         (mp->mnt_flag & MNT_NOATIME) ? ",noatime" : ""
 589                         );
 590
 591                 mtab = realloc(mtab, mtabsz + len, M_TEMP, M_WAITOK);
 592                 memcpy(mtab + mtabsz, bf, len);
 593                 mtabsz += len;
 594
 595                 vfs_unbusy(mp, false, &nmp);
 596         }
 597         mutex_exit(&mountlist_lock);
 598         free(bf, M_TEMP);
 599
 600         if (mtabsz > 0) {
 601                 error = uiomove_frombuf(mtab, mtabsz, uio);
 602                 free(mtab, M_TEMP);
 603         }
 604
 605         return error;
 606 }