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

   1 /*
   2  * Copyright (c) 2009, 2010 Jeff Mahoney <jeffm@suse.com>
   3  * Copyright (c) 2011-2016 Dmitry V. Levin <ldv@altlinux.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "defs.h"
  30
  31 #include DEF_MPERS_TYPE(struct_blk_user_trace_setup)
  32 #include DEF_MPERS_TYPE(struct_blkpg_ioctl_arg)
  33 #include DEF_MPERS_TYPE(struct_blkpg_partition)
  34
  35 #include <linux/blkpg.h>
  36 #include <linux/fs.h>
  37
  38 #define BLKTRACE_BDEV_SIZE      32
  39 typedef struct blk_user_trace_setup {
  40         char name[BLKTRACE_BDEV_SIZE];  /* output */
  41         uint16_t act_mask;              /* input */
  42         uint32_t buf_size;              /* input */
  43         uint32_t buf_nr;                /* input */
  44         uint64_t start_lba;
  45         uint64_t end_lba;
  46         uint32_t pid;
  47 } struct_blk_user_trace_setup;
  48
  49 typedef struct blkpg_ioctl_arg struct_blkpg_ioctl_arg;
  50 typedef struct blkpg_partition struct_blkpg_partition;
  51
  52 #include MPERS_DEFS
  53
  54 /*
  55  * ioctl numbers <= 114 are present in Linux 2.4.  The following ones have been
  56  * added since then and headers containing them may not be available on every
  57  * system.
  58  */
  59
  60 #ifndef BLKTRACESETUP
  61 # define BLKTRACESETUP _IOWR(0x12, 115, struct_blk_user_trace_setup)
  62 #endif
  63 #ifndef BLKTRACESTART
  64 # define BLKTRACESTART _IO(0x12,116)
  65 #endif
  66 #ifndef BLKTRACESTOP
  67 # define BLKTRACESTOP _IO(0x12,117)
  68 #endif
  69 #ifndef BLKTRACETEARDOWN
  70 # define BLKTRACETEARDOWN _IO(0x12,118)
  71 #endif
  72 #ifndef BLKDISCARD
  73 # define BLKDISCARD _IO(0x12,119)
  74 #endif
  75 #ifndef BLKIOMIN
  76 # define BLKIOMIN _IO(0x12,120)
  77 #endif
  78 #ifndef BLKIOOPT
  79 # define BLKIOOPT _IO(0x12,121)
  80 #endif
  81 #ifndef BLKALIGNOFF
  82 # define BLKALIGNOFF _IO(0x12,122)
  83 #endif
  84 #ifndef BLKPBSZGET
  85 # define BLKPBSZGET _IO(0x12,123)
  86 #endif
  87 #ifndef BLKDISCARDZEROES
  88 # define BLKDISCARDZEROES _IO(0x12,124)
  89 #endif
  90 #ifndef BLKSECDISCARD
  91 # define BLKSECDISCARD _IO(0x12,125)
  92 #endif
  93 #ifndef BLKROTATIONAL
  94 # define BLKROTATIONAL _IO(0x12,126)
  95 #endif
  96 #ifndef BLKZEROOUT
  97 # define BLKZEROOUT _IO(0x12,127)
  98 #endif
  99 #ifndef BLKDAXGET
 100 # define BLKDAXGET _IO(0x12,129)
 101 #endif
 102
 103 #include "xlat/blkpg_ops.h"
 104
 105 static void
 106 print_blkpg_req(struct tcb *tcp, const struct_blkpg_ioctl_arg *blkpg)
 107 {
 108         struct_blkpg_partition p;
 109
 110         tprints("{");
 111         printxval(blkpg_ops, blkpg->op, "BLKPG_???");
 112
 113         tprintf(", flags=%d, datalen=%d, data=",
 114                 blkpg->flags, blkpg->datalen);
 115
 116         if (!umove_or_printaddr(tcp, (long) blkpg->data, &p)) {
 117                 tprintf("{start=%lld, length=%lld, pno=%d, devname=",
 118                         (long long) p.start, (long long) p.length, p.pno);
 119                 print_quoted_string(p.devname, sizeof(p.devname),
 120                                     QUOTE_0_TERMINATED);
 121                 tprints(", volname=");
 122                 print_quoted_string(p.volname, sizeof(p.volname),
 123                                     QUOTE_0_TERMINATED);
 124                 tprints("}");
 125         }
 126         tprints("}");
 127 }
 128
 129 MPERS_PRINTER_DECL(int, block_ioctl, struct tcb *tcp,
 130                    const unsigned int code, const long arg)
 131 {
 132         switch (code) {
 133         /* take arg as a value, not as a pointer */
 134         case BLKRASET:
 135         case BLKFRASET:
 136                 tprintf(", %lu", arg);
 137                 break;
 138
 139         /* return an unsigned short */
 140         case BLKSECTGET:
 141         case BLKROTATIONAL:
 142                 if (entering(tcp))
 143                         return 0;
 144                 tprints(", ");
 145                 printnum_short(tcp, arg, "%hu");
 146                 break;
 147
 148         /* return a signed int */
 149         case BLKROGET:
 150         case BLKBSZGET:
 151         case BLKSSZGET:
 152         case BLKALIGNOFF:
 153         case BLKDAXGET:
 154                 if (entering(tcp))
 155                         return 0;
 156                 /* fall through */
 157         /* take a signed int */
 158         case BLKROSET:
 159         case BLKBSZSET:
 160                 tprints(", ");
 161                 printnum_int(tcp, arg, "%d");
 162                 break;
 163
 164         /* return an unsigned int */
 165         case BLKPBSZGET:
 166         case BLKIOMIN:
 167         case BLKIOOPT:
 168         case BLKDISCARDZEROES:
 169                 if (entering(tcp))
 170                         return 0;
 171                 tprints(", ");
 172                 printnum_int(tcp, arg, "%u");
 173                 break;
 174
 175         /* return a signed long */
 176         case BLKRAGET:
 177         case BLKFRAGET:
 178                 if (entering(tcp))
 179                         return 0;
 180                 tprints(", ");
 181                 printnum_slong(tcp, arg);
 182                 break;
 183
 184         /* returns an unsigned long */
 185         case BLKGETSIZE:
 186                 if (entering(tcp))
 187                         return 0;
 188                 tprints(", ");
 189                 printnum_ulong(tcp, arg);
 190                 break;
 191
 192 #ifdef HAVE_BLKGETSIZE64
 193         /* returns an uint64_t */
 194         case BLKGETSIZE64:
 195                 if (entering(tcp))
 196                         return 0;
 197                 tprints(", ");
 198                 printnum_int64(tcp, arg, "%" PRIu64);
 199                 break;
 200 #endif
 201
 202         /* takes a pair of uint64_t */
 203         case BLKDISCARD:
 204         case BLKSECDISCARD:
 205         case BLKZEROOUT:
 206                 tprints(", ");
 207                 printpair_int64(tcp, arg, "%" PRIu64);
 208                 break;
 209
 210         /* More complex types */
 211         case BLKPG: {
 212                 struct_blkpg_ioctl_arg blkpg;
 213
 214                 tprints(", ");
 215                 if (!umove_or_printaddr(tcp, arg, &blkpg))
 216                         print_blkpg_req(tcp, &blkpg);
 217                 break;
 218         }
 219
 220         case BLKTRACESETUP:
 221                 if (entering(tcp)) {
 222                         struct_blk_user_trace_setup buts;
 223
 224                         tprints(", ");
 225                         if (umove_or_printaddr(tcp, arg, &buts))
 226                                 break;
 227                         tprintf("{act_mask=%u, buf_size=%u, "
 228                                 "buf_nr=%u, start_lba=%" PRIu64 ", "
 229                                 "end_lba=%" PRIu64 ", pid=%u",
 230                                 (unsigned)buts.act_mask, buts.buf_size,
 231                                 buts.buf_nr, buts.start_lba,
 232                                 buts.end_lba, buts.pid);
 233                         return 1;
 234                 } else {
 235                         struct_blk_user_trace_setup buts;
 236
 237                         if (!syserror(tcp) && !umove(tcp, arg, &buts)) {
 238                                 tprints(", name=");
 239                                 print_quoted_string(buts.name, sizeof(buts.name),
 240                                                     QUOTE_0_TERMINATED);
 241                         }
 242                         tprints("}");
 243                         break;
 244                 }
 245
 246         /* No arguments */
 247         case BLKRRPART:
 248         case BLKFLSBUF:
 249         case BLKTRACESTART:
 250         case BLKTRACESTOP:
 251         case BLKTRACETEARDOWN:
 252                 break;
 253         default:
 254                 return RVAL_DECODED;
 255         }
 256
 257         return RVAL_DECODED | 1;
 258 }