granicus.if.org Git - strace/blob - loop.c

   1 /*
   2  * Copyright (c) 2012 The Chromium OS Authors.
   3  * Written by Mike Frysinger <vapier@gentoo.org>.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "defs.h"
  29 #include <linux/ioctl.h>
  30 #include <linux/loop.h>
  31
  32 #include "xlat/loop_flags_options.h"
  33 #include "xlat/loop_crypt_type_options.h"
  34
  35 static void
  36 decode_loop_info(struct tcb *tcp, const long addr)
  37 {
  38         struct loop_info info;
  39
  40         tprints(", ");
  41         if (umove_or_printaddr(tcp, addr, &info))
  42                 return;
  43
  44         tprintf("{number=%d", info.lo_number);
  45
  46         if (!abbrev(tcp)) {
  47                 tprintf(", device=%#lx, inode=%lu, rdevice=%#lx",
  48                         (unsigned long) info.lo_device,
  49                         info.lo_inode,
  50                         (unsigned long) info.lo_rdevice);
  51         }
  52
  53         tprintf(", offset=%#x", info.lo_offset);
  54
  55         if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
  56                 tprints(", encrypt_type=");
  57                 printxval(loop_crypt_type_options, info.lo_encrypt_type,
  58                         "LO_CRYPT_???");
  59                 tprintf(", encrypt_key_size=%d", info.lo_encrypt_key_size);
  60         }
  61
  62         tprints(", flags=");
  63         printflags(loop_flags_options, info.lo_flags, "LO_FLAGS_???");
  64
  65         tprints(", name=");
  66         print_quoted_string(info.lo_name, LO_NAME_SIZE,
  67                             QUOTE_0_TERMINATED);
  68
  69         if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
  70                 tprints(", encrypt_key=");
  71                 print_quoted_string((void *) info.lo_encrypt_key,
  72                                     LO_KEY_SIZE, 0);
  73         }
  74
  75         if (!abbrev(tcp))
  76                 tprintf(", init={%#lx, %#lx}"
  77                         ", reserved={%#x, %#x, %#x, %#x}}",
  78                         info.lo_init[0], info.lo_init[1],
  79                         info.reserved[0], info.reserved[1],
  80                         info.reserved[2], info.reserved[3]);
  81         else
  82                 tprints(", ...}");
  83 }
  84
  85 static void
  86 decode_loop_info64(struct tcb *tcp, const long addr)
  87 {
  88         struct loop_info64 info64;
  89
  90         tprints(", ");
  91         if (umove_or_printaddr(tcp, addr, &info64))
  92                 return;
  93
  94         if (!abbrev(tcp)) {
  95                 tprintf("{device=%" PRIu64 ", inode=%" PRIu64 ", "
  96                         "rdevice=%" PRIu64 ", offset=%#" PRIx64 ", "
  97                         "sizelimit=%" PRIu64 ", number=%" PRIu32,
  98                         (uint64_t) info64.lo_device,
  99                         (uint64_t) info64.lo_inode,
 100                         (uint64_t) info64.lo_rdevice,
 101                         (uint64_t) info64.lo_offset,
 102                         (uint64_t) info64.lo_sizelimit,
 103                         (uint32_t) info64.lo_number);
 104         } else {
 105                 tprintf("{offset=%#" PRIx64 ", number=%" PRIu32,
 106                         (uint64_t) info64.lo_offset,
 107                         (uint32_t) info64.lo_number);
 108         }
 109
 110         if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
 111                 tprints(", encrypt_type=");
 112                 printxval(loop_crypt_type_options, info64.lo_encrypt_type,
 113                         "LO_CRYPT_???");
 114                 tprintf(", encrypt_key_size=%" PRIu32,
 115                         info64.lo_encrypt_key_size);
 116         }
 117
 118         tprints(", flags=");
 119         printflags(loop_flags_options, info64.lo_flags, "LO_FLAGS_???");
 120
 121         tprints(", file_name=");
 122         print_quoted_string((void *) info64.lo_file_name,
 123                             LO_NAME_SIZE, QUOTE_0_TERMINATED);
 124
 125         if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
 126                 tprints(", crypt_name=");
 127                 print_quoted_string((void *) info64.lo_crypt_name,
 128                                     LO_NAME_SIZE, QUOTE_0_TERMINATED);
 129                 tprints(", encrypt_key=");
 130                 print_quoted_string((void *) info64.lo_encrypt_key,
 131                                     LO_KEY_SIZE, 0);
 132         }
 133
 134         if (!abbrev(tcp))
 135                 tprintf(", init={%#" PRIx64 ", %#" PRIx64 "}}",
 136                         (uint64_t) info64.lo_init[0],
 137                         (uint64_t) info64.lo_init[1]);
 138         else
 139                 tprints(", ...}");
 140 }
 141
 142 int
 143 loop_ioctl(struct tcb *tcp, const unsigned int code, long arg)
 144 {
 145         if (!verbose(tcp))
 146                 return RVAL_DECODED;
 147
 148         switch (code) {
 149         case LOOP_SET_STATUS:
 150                 decode_loop_info(tcp, arg);
 151                 break;
 152
 153         case LOOP_GET_STATUS:
 154                 if (entering(tcp))
 155                         return 0;
 156                 decode_loop_info(tcp, arg);
 157                 break;
 158
 159         case LOOP_SET_STATUS64:
 160                 decode_loop_info64(tcp, arg);
 161                 break;
 162
 163         case LOOP_GET_STATUS64:
 164                 if (entering(tcp))
 165                         return 0;
 166                 decode_loop_info64(tcp, arg);
 167                 break;
 168
 169         case LOOP_CLR_FD:
 170 #ifdef LOOP_SET_CAPACITY
 171         case LOOP_SET_CAPACITY:
 172 #endif
 173 #ifdef LOOP_CTL_GET_FREE
 174         /* newer loop-control stuff */
 175         case LOOP_CTL_GET_FREE:
 176 #endif
 177                 /* Takes no arguments */
 178                 break;
 179
 180         case LOOP_SET_FD:
 181         case LOOP_CHANGE_FD:
 182                 tprints(", ");
 183                 printfd(tcp, arg);
 184                 break;
 185
 186 #ifdef LOOP_CTL_ADD
 187         /* newer loop-control stuff */
 188         case LOOP_CTL_ADD:
 189         case LOOP_CTL_REMOVE:
 190                 tprintf(", %d", (int) arg);
 191                 break;
 192 #endif
 193
 194         default:
 195                 return RVAL_DECODED;
 196         }
 197
 198         return RVAL_DECODED | 1;
 199 }