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 typedef struct loop_info struct_loop_info;
  33
  34 #include DEF_MPERS_TYPE(struct_loop_info)
  35
  36 #include MPERS_DEFS
  37
  38 #include "xlat/loop_flags_options.h"
  39 #include "xlat/loop_crypt_type_options.h"
  40
  41 static void
  42 decode_loop_info(struct tcb *const tcp, const kernel_ulong_t addr)
  43 {
  44         struct_loop_info info;
  45
  46         tprints(", ");
  47         if (umove_or_printaddr(tcp, addr, &info))
  48                 return;
  49
  50         tprintf("{lo_number=%d", info.lo_number);
  51
  52         if (!abbrev(tcp)) {
  53                 tprints(", lo_device=");
  54                 print_dev_t(info.lo_device);
  55                 tprintf(", lo_inode=%" PRI_klu, (kernel_ulong_t) info.lo_inode);
  56                 tprints(", lo_rdevice=");
  57                 print_dev_t(info.lo_rdevice);
  58         }
  59
  60         tprintf(", lo_offset=%#x", info.lo_offset);
  61
  62         if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
  63                 tprints(", lo_encrypt_type=");
  64                 printxval(loop_crypt_type_options, info.lo_encrypt_type,
  65                         "LO_CRYPT_???");
  66                 tprintf(", lo_encrypt_key_size=%d", info.lo_encrypt_key_size);
  67         }
  68
  69         tprints(", lo_flags=");
  70         printflags(loop_flags_options, info.lo_flags, "LO_FLAGS_???");
  71
  72         tprints(", lo_name=");
  73         print_quoted_string(info.lo_name, LO_NAME_SIZE,
  74                             QUOTE_0_TERMINATED);
  75
  76         if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
  77                 tprints(", lo_encrypt_key=");
  78                 print_quoted_string((void *) info.lo_encrypt_key,
  79                                     LO_KEY_SIZE, 0);
  80         }
  81
  82         if (!abbrev(tcp))
  83                 tprintf(", lo_init=[%#" PRI_klx ", %#" PRI_klx "]"
  84                         ", reserved=[%#x, %#x, %#x, %#x]}",
  85                         (kernel_ulong_t) info.lo_init[0],
  86                         (kernel_ulong_t) info.lo_init[1],
  87                         info.reserved[0], info.reserved[1],
  88                         info.reserved[2], info.reserved[3]);
  89         else
  90                 tprints(", ...}");
  91 }
  92
  93 static void
  94 decode_loop_info64(struct tcb *const tcp, const kernel_ulong_t addr)
  95 {
  96         struct loop_info64 info64;
  97
  98         tprints(", ");
  99         if (umove_or_printaddr(tcp, addr, &info64))
 100                 return;
 101
 102         if (!abbrev(tcp)) {
 103                 tprints("{lo_device=");
 104                 print_dev_t(info64.lo_device);
 105                 tprintf(", lo_inode=%" PRIu64, (uint64_t) info64.lo_inode);
 106                 tprints(", lo_rdevice=");
 107                 print_dev_t(info64.lo_rdevice);
 108                 tprintf(", lo_offset=%#" PRIx64 ", lo_sizelimit=%" PRIu64
 109                         ", lo_number=%" PRIu32,
 110                         (uint64_t) info64.lo_offset,
 111                         (uint64_t) info64.lo_sizelimit,
 112                         (uint32_t) info64.lo_number);
 113         } else {
 114                 tprintf("{lo_offset=%#" PRIx64 ", lo_number=%" PRIu32,
 115                         (uint64_t) info64.lo_offset,
 116                         (uint32_t) info64.lo_number);
 117         }
 118
 119         if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
 120                 tprints(", lo_encrypt_type=");
 121                 printxval(loop_crypt_type_options, info64.lo_encrypt_type,
 122                         "LO_CRYPT_???");
 123                 tprintf(", lo_encrypt_key_size=%" PRIu32,
 124                         info64.lo_encrypt_key_size);
 125         }
 126
 127         tprints(", lo_flags=");
 128         printflags(loop_flags_options, info64.lo_flags, "LO_FLAGS_???");
 129
 130         tprints(", lo_file_name=");
 131         print_quoted_string((void *) info64.lo_file_name,
 132                             LO_NAME_SIZE, QUOTE_0_TERMINATED);
 133
 134         if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
 135                 tprints(", lo_crypt_name=");
 136                 print_quoted_string((void *) info64.lo_crypt_name,
 137                                     LO_NAME_SIZE, QUOTE_0_TERMINATED);
 138                 tprints(", lo_encrypt_key=");
 139                 print_quoted_string((void *) info64.lo_encrypt_key,
 140                                     LO_KEY_SIZE, 0);
 141         }
 142
 143         if (!abbrev(tcp))
 144                 tprintf(", lo_init=[%#" PRIx64 ", %#" PRIx64 "]}",
 145                         (uint64_t) info64.lo_init[0],
 146                         (uint64_t) info64.lo_init[1]);
 147         else
 148                 tprints(", ...}");
 149 }
 150
 151 MPERS_PRINTER_DECL(int, loop_ioctl,
 152                    struct tcb *tcp, const unsigned int code,
 153                    const kernel_ulong_t arg)
 154 {
 155         if (!verbose(tcp))
 156                 return RVAL_DECODED;
 157
 158         switch (code) {
 159         case LOOP_GET_STATUS:
 160                 if (entering(tcp))
 161                         return 0;
 162                 /* fall through */
 163         case LOOP_SET_STATUS:
 164                 decode_loop_info(tcp, arg);
 165                 break;
 166
 167         case LOOP_GET_STATUS64:
 168                 if (entering(tcp))
 169                         return 0;
 170                 /* fall through */
 171         case LOOP_SET_STATUS64:
 172                 decode_loop_info64(tcp, arg);
 173                 break;
 174
 175         case LOOP_CLR_FD:
 176 #ifdef LOOP_SET_CAPACITY
 177         case LOOP_SET_CAPACITY:
 178 #endif
 179 #ifdef LOOP_CTL_GET_FREE
 180         /* newer loop-control stuff */
 181         case LOOP_CTL_GET_FREE:
 182 #endif
 183                 /* Takes no arguments */
 184                 break;
 185
 186         case LOOP_SET_FD:
 187         case LOOP_CHANGE_FD:
 188                 tprints(", ");
 189                 printfd(tcp, arg);
 190                 break;
 191
 192 #ifdef LOOP_CTL_ADD
 193         /* newer loop-control stuff */
 194         case LOOP_CTL_ADD:
 195         case LOOP_CTL_REMOVE:
 196                 tprintf(", %d", (int) arg);
 197                 break;
 198 #endif
 199
 200 #ifdef LOOP_SET_DIRECT_IO
 201         case LOOP_SET_DIRECT_IO:
 202                 tprintf(", %" PRI_klu, arg);
 203                 break;
 204 #endif
 205
 206         default:
 207                 return RVAL_DECODED;
 208         }
 209
 210         return RVAL_DECODED | 1;
 211 }