usr.bin/lsvfs/lsvfs.c

   1 /*
   2  * lsvfs - list loaded VFSes
   3  * Garrett A. Wollman, September 1994
   4  * This file is in the public domain.
   5  *
   6  * $FreeBSD: src/usr.bin/lsvfs/lsvfs.c,v 1.13.2.1 2001/07/30 09:59:16 dd Exp $
   7  */
   8
   9 #define _NEW_VFSCONF
  10
  11 #include <sys/param.h>
  12 #include <sys/mount.h>
  13
  14 #include <err.h>
  15 #include <stdio.h>
  16 #include <string.h>
  17
  18 #define FMT     "%-32.32s 0x%08x %5d  %s\n"
  19 #define HDRFMT  "%-32.32s %10s %5.5s  %s\n"
  20 #define DASHES  "-------------------------------- "     \
  21                 "---------- -----  ---------------\n"
  22
  23 static struct flaglist {
  24         int             flag;
  25         const char      str[32]; /* must be longer than the longest one. */
  26 } fl[] = {
  27         { .flag = VFCF_STATIC, .str = "static", },
  28         { .flag = VFCF_NETWORK, .str = "network", },
  29         { .flag = VFCF_READONLY, .str = "read-only", },
  30         { .flag = VFCF_SYNTHETIC, .str = "synthetic", },
  31         { .flag = VFCF_LOOPBACK, .str = "loopback", },
  32         { .flag = VFCF_UNICODE, .str = "unicode", },
  33 };
  34
  35 static const char *fmt_flags(int);
  36
  37 int
  38 main(int argc, char **argv)
  39 {
  40   int rv = 0;
  41   struct vfsconf vfc;
  42   struct ovfsconf *ovfcp;
  43   argc--, argv++;
  44
  45   setvfsent(1);
  46
  47   printf(HDRFMT, "Filesystem", "Num", "Refs", "Flags");
  48   fputs(DASHES, stdout);
  49
  50   if(argc) {
  51     for(; argc; argc--, argv++) {
  52       if (getvfsbyname(*argv, &vfc) == 0) {
  53         printf(FMT, vfc.vfc_name, vfc.vfc_typenum, vfc.vfc_refcount,
  54             fmt_flags(vfc.vfc_flags));
  55       } else {
  56         warnx("VFS %s unknown or not loaded", *argv);
  57         rv++;
  58       }
  59     }
  60   } else {
  61     while ((ovfcp = getvfsent()) != NULL) {
  62       if (getvfsbyname(ovfcp->vfc_name, &vfc) == 0) {
  63         printf(FMT, vfc.vfc_name, vfc.vfc_typenum, vfc.vfc_refcount,
  64             fmt_flags(vfc.vfc_flags));
  65       } else {
  66         warnx("VFS %s unknown or not loaded", *argv);
  67         rv++;
  68       }
  69     }
  70   }
  71
  72   endvfsent();
  73   return rv;
  74 }
  75
  76 static const char *
  77 fmt_flags(int flags)
  78 {
  79         static char buf[sizeof(struct flaglist) * sizeof(fl)];
  80         int i;
  81
  82         buf[0] = '\0';
  83         for (i = 0; i < (int)nitems(fl); i++)
  84                 if (flags & fl[i].flag) {
  85                         strlcat(buf, fl[i].str, sizeof(buf));
  86                         strlcat(buf, ", ", sizeof(buf));
  87                 }
  88         if (buf[0] != '\0')
  89                 buf[strlen(buf) - 2] = '\0';
  90         return (buf);
  91 }