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

   1 /*
   2  * Copyright (c) 2009, 2010 Jeff Mahoney <jeffm@suse.com>
   3  * All rights reserved.
   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 #ifdef LINUX
  30 #include <stdint.h>
  31 #include <inttypes.h>
  32 #include <linux/blkpg.h>
  33 #include <linux/fs.h>
  34 #include <linux/hdreg.h>
  35
  36 /* ioctls <= 114 are present in Linux 2.4. The following ones have been
  37  * added since then and headers containing them may not be available on
  38  * every system. */
  39
  40 #define BLKTRACE_BDEV_SIZE      32
  41 struct blk_user_trace_setup {
  42         char name[BLKTRACE_BDEV_SIZE];  /* output */
  43         uint16_t act_mask;              /* input */
  44         uint32_t buf_size;              /* input */
  45         uint32_t buf_nr;                /* input */
  46         uint64_t start_lba;
  47         uint64_t end_lba;
  48         uint32_t pid;
  49 };
  50
  51 #ifndef BLKTRACESETUP
  52 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
  53 #endif
  54 #ifndef BLKTRACESTART
  55 #define BLKTRACESTART _IO(0x12,116)
  56 #endif
  57 #ifndef BLKTRACESTOP
  58 #define BLKTRACESTOP _IO(0x12,117)
  59 #endif
  60 #ifndef BLKTRACETEARDOWN
  61 #define BLKTRACETEARDOWN _IO(0x12,118)
  62 #endif
  63 #ifndef BLKDISCARD
  64 #define BLKDISCARD _IO(0x12,119)
  65 #endif
  66 #ifndef BLKIOMIN
  67 #define BLKIOMIN _IO(0x12,120)
  68 #endif
  69 #ifndef BLKIOOPT
  70 #define BLKIOOPT _IO(0x12,121)
  71 #endif
  72 #ifndef BLKALIGNOFF
  73 #define BLKALIGNOFF _IO(0x12,122)
  74 #endif
  75 #ifndef BLKPBSZGET
  76 #define BLKPBSZGET _IO(0x12,123)
  77 #endif
  78 #ifndef BLKDISCARDZEROES
  79 #define BLKDISCARDZEROES _IO(0x12,124)
  80 #endif
  81 #ifndef BLKSECDISCARD
  82 #define BLKSECDISCARD _IO(0x12,125)
  83 #endif
  84
  85 static const struct xlat blkpg_ops[] = {
  86         { BLKPG_ADD_PARTITION,  "BLKPG_ADD_PARTITION", },
  87         { BLKPG_DEL_PARTITION,  "BLKPG_DEL_PARTITION", },
  88         { 0,                    NULL },
  89 };
  90
  91 static void
  92 print_blkpg_req(struct tcb *tcp, struct blkpg_ioctl_arg *blkpg)
  93 {
  94         struct blkpg_partition p;
  95
  96         tprintf("{");
  97         printxval(blkpg_ops, blkpg->op, "BLKPG_???");
  98
  99         tprintf(", flags=%d, datalen=%d, ",
 100                 blkpg->flags, blkpg->datalen);
 101
 102         if (umove(tcp, (long) blkpg->data, &p) < 0)
 103                 tprintf("%#lx}", (long) blkpg->data);
 104         else
 105                 tprintf("{start=%lld, length=%lld, pno=%d, "
 106                         "devname=\"%.*s\", volname=\"%.*s\"}}",
 107                         p.start, p.length, p.pno,
 108                         (int) sizeof(p.devname), p.devname,
 109                         (int) sizeof(p.volname), p.volname);
 110 }
 111
 112 int
 113 block_ioctl(struct tcb *tcp, long code, long arg)
 114 {
 115         switch (code) {
 116         /* take arg as a value, not as a pointer */
 117         case BLKRASET:
 118         case BLKFRASET:
 119                 if (entering(tcp))
 120                         tprintf(", %ld", arg);
 121                 break;
 122
 123         /* take a signed int */
 124         case BLKROSET:
 125         case BLKBSZSET:
 126                 if (entering(tcp)) {
 127                         int val;
 128                         if (umove(tcp, arg, &val) < 0)
 129                                 tprintf(", %#lx", arg);
 130                         else
 131                                 tprintf(", %d", val);
 132                 }
 133                 break;
 134
 135         /* returns an unsigned short */
 136         case BLKSECTGET:
 137                 if (exiting(tcp)) {
 138                         unsigned short val;
 139                         if (syserror(tcp) || umove(tcp, arg, &val) < 0)
 140                                 tprintf(", %#lx", arg);
 141                         else
 142                                 tprintf(", %hu", val);
 143                 }
 144                 break;
 145
 146         /* return a signed int */
 147         case BLKROGET:
 148         case BLKBSZGET:
 149         case BLKSSZGET:
 150         case BLKALIGNOFF:
 151                 if (exiting(tcp)) {
 152                         int val;
 153                         if (syserror(tcp) || umove(tcp, arg, &val) < 0)
 154                                 tprintf(", %#lx", arg);
 155                         else
 156                                 tprintf(", %d", val);
 157                 }
 158                 break;
 159
 160         /* return an unsigned int */
 161         case BLKPBSZGET:
 162         case BLKIOMIN:
 163         case BLKIOOPT:
 164         case BLKDISCARDZEROES:
 165                 if (exiting(tcp)) {
 166                         unsigned int val;
 167                         if (syserror(tcp) || umove(tcp, arg, &val) < 0)
 168                                 tprintf(", %#lx", arg);
 169                         else
 170                                 tprintf(", %u", val);
 171                 }
 172                 break;
 173
 174         /* return a signed long */
 175         case BLKRAGET:
 176         case BLKFRAGET:
 177                 if (exiting(tcp)) {
 178                         long val;
 179                         if (syserror(tcp) || umove(tcp, arg, &val) < 0)
 180                                 tprintf(", %#lx", arg);
 181                         else
 182                                 tprintf(", %ld", val);
 183                 }
 184                 break;
 185
 186         /* returns an unsigned long */
 187         case BLKGETSIZE:
 188                 if (exiting(tcp)) {
 189                         unsigned long val;
 190                         if (syserror(tcp) || umove(tcp, arg, &val) < 0)
 191                                 tprintf(", %#lx", arg);
 192                         else
 193                                 tprintf(", %lu", val);
 194                         }
 195                 break;
 196
 197         /* return an uint64_t */
 198         case BLKGETSIZE64:
 199                 if (exiting(tcp)) {
 200                         uint64_t val;
 201                         if (syserror(tcp) || umove(tcp, arg, &val) < 0)
 202                                 tprintf(", %#lx", arg);
 203                         else
 204                                 tprintf(", %" PRIu64, val);
 205                 }
 206                 break;
 207
 208         /* More complex types */
 209         case BLKDISCARD:
 210         case BLKSECDISCARD:
 211                 if (entering(tcp)) {
 212                         uint64_t range[2];
 213                         if (umove(tcp, arg, range) < 0)
 214                                 tprintf(", %#lx", arg);
 215                         else
 216                                 tprintf(", {%" PRIx64 ", %" PRIx64 "}",
 217                                         range[0], range[1]);
 218                 }
 219                 break;
 220
 221         case HDIO_GETGEO:
 222                 if (exiting(tcp)) {
 223                         struct hd_geometry geo;
 224                         if (syserror(tcp) || umove(tcp, arg, &geo) < 0)
 225                                 tprintf(", %#lx", arg);
 226                         else
 227                                 tprintf(", {heads=%hhu, sectors=%hhu, "
 228                                         "cylinders=%hu, start=%lu}",
 229                                         geo.heads, geo.sectors,
 230                                         geo.cylinders, geo.start);
 231                 }
 232                 break;
 233
 234         case BLKPG:
 235                 if (entering(tcp)) {
 236                         struct blkpg_ioctl_arg blkpg;
 237                         if (umove(tcp, arg, &blkpg) < 0)
 238                                 tprintf(", %#lx", arg);
 239                         else {
 240                                 tprintf(", ");
 241                                 print_blkpg_req(tcp, &blkpg);
 242                         }
 243                 }
 244                 break;
 245
 246         case BLKTRACESETUP:
 247                 if (entering(tcp)) {
 248                         struct blk_user_trace_setup buts;
 249                         if (umove(tcp, arg, &buts) < 0)
 250                                 tprintf(", %#lx", arg);
 251                         else
 252                                 tprintf(", {act_mask=%hu, buf_size=%u, "
 253                                         "buf_nr=%u, start_lba=%" PRIu64 ", "
 254                                         "end_lba=%" PRIu64 ", pid=%u}",
 255                                         buts.act_mask, buts.buf_size,
 256                                         buts.buf_nr, buts.start_lba,
 257                                         buts.end_lba, buts.pid);
 258                 }
 259                 if (exiting(tcp)) {
 260                         struct blk_user_trace_setup buts;
 261                         if (syserror(tcp) || umove(tcp, arg, &buts) < 0)
 262                                 tprintf(", %#lx", arg);
 263                         else
 264                                 tprintf(", {name=\"%.*s\"}",
 265                                         (int) sizeof(buts.name), buts.name);
 266                 }
 267                 break;
 268
 269         /* No arguments or unhandled */
 270         case BLKTRACESTART:
 271         case BLKTRACESTOP:
 272         case BLKTRACETEARDOWN:
 273         case BLKFLSBUF: /* Requires driver knowlege */
 274         case BLKRRPART: /* No args */
 275         default:
 276                 if (entering(tcp))
 277                         tprintf(", %#lx", arg);
 278                 break;
 279
 280         };
 281         return 1;
 282 }
 283 #endif /* LINUX */