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 *const tcp, const kernel_ulong_t addr)
  37 {
  38         struct loop_info info;
  39
  40         tprints(", ");
  41         if (umove_or_printaddr(tcp, addr, &info))
  42                 return;
  43
  44         tprintf("{lo_number=%d", info.lo_number);
  45
  46         if (!abbrev(tcp)) {
  47                 tprints(", lo_device=");
  48                 print_dev_t(info.lo_device);
  49                 tprintf(", lo_inode=%lu", info.lo_inode);
  50                 tprints(", lo_rdevice=");
  51                 print_dev_t(info.lo_rdevice);
  52         }
  53
  54         tprintf(", lo_offset=%#x", info.lo_offset);
  55
  56         if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
  57                 tprints(", lo_encrypt_type=");
  58                 printxval(loop_crypt_type_options, info.lo_encrypt_type,
  59                         "LO_CRYPT_???");
  60                 tprintf(", lo_encrypt_key_size=%d", info.lo_encrypt_key_size);
  61         }
  62
  63         tprints(", lo_flags=");
  64         printflags(loop_flags_options, info.lo_flags, "LO_FLAGS_???");
  65
  66         tprints(", lo_name=");
  67         print_quoted_string(info.lo_name, LO_NAME_SIZE,
  68                             QUOTE_0_TERMINATED);
  69
  70         if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
  71                 tprints(", lo_encrypt_key=");
  72                 print_quoted_string((void *) info.lo_encrypt_key,
  73                                     LO_KEY_SIZE, 0);
  74         }
  75
  76         if (!abbrev(tcp))
  77                 tprintf(", lo_init=[%#lx, %#lx]"
  78                         ", reserved=[%#x, %#x, %#x, %#x]}",
  79                         info.lo_init[0], info.lo_init[1],
  80                         info.reserved[0], info.reserved[1],
  81                         info.reserved[2], info.reserved[3]);
  82         else
  83                 tprints(", ...}");
  84 }
  85
  86 static void
  87 decode_loop_info64(struct tcb *const tcp, const kernel_ulong_t addr)
  88 {
  89         struct loop_info64 info64;
  90
  91         tprints(", ");
  92         if (umove_or_printaddr(tcp, addr, &info64))
  93                 return;
  94
  95         if (!abbrev(tcp)) {
  96                 tprints("{lo_device=");
  97                 print_dev_t(info64.lo_device);
  98                 tprintf(", lo_inode=%" PRIu64, (uint64_t) info64.lo_inode);
  99                 tprints(", lo_rdevice=");
 100                 print_dev_t(info64.lo_rdevice);
 101                 tprintf(", lo_offset=%#" PRIx64 ", lo_sizelimit=%" PRIu64
 102                         ", lo_number=%" PRIu32,
 103                         (uint64_t) info64.lo_offset,
 104                         (uint64_t) info64.lo_sizelimit,
 105                         (uint32_t) info64.lo_number);
 106         } else {
 107                 tprintf("{lo_offset=%#" PRIx64 ", lo_number=%" PRIu32,
 108                         (uint64_t) info64.lo_offset,
 109                         (uint32_t) info64.lo_number);
 110         }
 111
 112         if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
 113                 tprints(", lo_encrypt_type=");
 114                 printxval(loop_crypt_type_options, info64.lo_encrypt_type,
 115                         "LO_CRYPT_???");
 116                 tprintf(", lo_encrypt_key_size=%" PRIu32,
 117                         info64.lo_encrypt_key_size);
 118         }
 119
 120         tprints(", lo_flags=");
 121         printflags(loop_flags_options, info64.lo_flags, "LO_FLAGS_???");
 122
 123         tprints(", lo_file_name=");
 124         print_quoted_string((void *) info64.lo_file_name,
 125                             LO_NAME_SIZE, QUOTE_0_TERMINATED);
 126
 127         if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
 128                 tprints(", lo_crypt_name=");
 129                 print_quoted_string((void *) info64.lo_crypt_name,
 130                                     LO_NAME_SIZE, QUOTE_0_TERMINATED);
 131                 tprints(", lo_encrypt_key=");
 132                 print_quoted_string((void *) info64.lo_encrypt_key,
 133                                     LO_KEY_SIZE, 0);
 134         }
 135
 136         if (!abbrev(tcp))
 137                 tprintf(", lo_init=[%#" PRIx64 ", %#" PRIx64 "]}",
 138                         (uint64_t) info64.lo_init[0],
 139                         (uint64_t) info64.lo_init[1]);
 140         else
 141                 tprints(", ...}");
 142 }
 143
 144 int
 145 loop_ioctl(struct tcb *const tcp, const unsigned int code,
 146            const kernel_ulong_t arg)
 147 {
 148         if (!verbose(tcp))
 149                 return RVAL_DECODED;
 150
 151         switch (code) {
 152         case LOOP_GET_STATUS:
 153                 if (entering(tcp))
 154                         return 0;
 155                 /* fall through */
 156         case LOOP_SET_STATUS:
 157                 decode_loop_info(tcp, arg);
 158                 break;
 159
 160         case LOOP_GET_STATUS64:
 161                 if (entering(tcp))
 162                         return 0;
 163                 /* fall through */
 164         case LOOP_SET_STATUS64:
 165                 decode_loop_info64(tcp, arg);
 166                 break;
 167
 168         case LOOP_CLR_FD:
 169 #ifdef LOOP_SET_CAPACITY
 170         case LOOP_SET_CAPACITY:
 171 #endif
 172 #ifdef LOOP_CTL_GET_FREE
 173         /* newer loop-control stuff */
 174         case LOOP_CTL_GET_FREE:
 175 #endif
 176                 /* Takes no arguments */
 177                 break;
 178
 179         case LOOP_SET_FD:
 180         case LOOP_CHANGE_FD:
 181                 tprints(", ");
 182                 printfd(tcp, arg);
 183                 break;
 184
 185 #ifdef LOOP_CTL_ADD
 186         /* newer loop-control stuff */
 187         case LOOP_CTL_ADD:
 188         case LOOP_CTL_REMOVE:
 189                 tprintf(", %d", (int) arg);
 190                 break;
 191 #endif
 192
 193 #ifdef LOOP_SET_DIRECT_IO
 194         case LOOP_SET_DIRECT_IO:
 195                 tprintf(", %" PRI_klu, arg);
 196                 break;
 197 #endif
 198
 199         default:
 200                 return RVAL_DECODED;
 201         }
 202
 203         return RVAL_DECODED | 1;
 204 }