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/ioctl.h>
  36 #include <linux/fs.h>
  37
  38 typedef struct {
  39         int op;
  40         int flags;
  41         int datalen;
  42         void *data;
  43 } struct_blkpg_ioctl_arg;
  44
  45 #define BLKPG_DEVNAMELTH        64
  46 #define BLKPG_VOLNAMELTH        64
  47 typedef struct {
  48         long long start;                /* starting offset in bytes */
  49         long long length;               /* length in bytes */
  50         int pno;                        /* partition number */
  51         char devname[BLKPG_DEVNAMELTH]; /* partition name, like sda5 or c0d1p2,
  52                                            to be used in kernel messages */
  53         char volname[BLKPG_VOLNAMELTH]; /* volume label */
  54 } struct_blkpg_partition;
  55
  56 #define BLKTRACE_BDEV_SIZE      32
  57 typedef struct blk_user_trace_setup {
  58         char name[BLKTRACE_BDEV_SIZE];  /* output */
  59         uint16_t act_mask;              /* input */
  60         uint32_t buf_size;              /* input */
  61         uint32_t buf_nr;                /* input */
  62         uint64_t start_lba;
  63         uint64_t end_lba;
  64         uint32_t pid;
  65 } struct_blk_user_trace_setup;
  66
  67 #include MPERS_DEFS
  68
  69 #ifndef BLKPG
  70 # define BLKPG      _IO(0x12,105)
  71 #endif
  72
  73 /*
  74  * ioctl numbers <= 114 are present in Linux 2.4.  The following ones have been
  75  * added since then and headers containing them may not be available on every
  76  * system.
  77  */
  78
  79 #ifndef BLKTRACESETUP
  80 # define BLKTRACESETUP _IOWR(0x12, 115, struct_blk_user_trace_setup)
  81 #endif
  82 #ifndef BLKTRACESTART
  83 # define BLKTRACESTART _IO(0x12,116)
  84 #endif
  85 #ifndef BLKTRACESTOP
  86 # define BLKTRACESTOP _IO(0x12,117)
  87 #endif
  88 #ifndef BLKTRACETEARDOWN
  89 # define BLKTRACETEARDOWN _IO(0x12,118)
  90 #endif
  91 #ifndef BLKDISCARD
  92 # define BLKDISCARD _IO(0x12,119)
  93 #endif
  94 #ifndef BLKIOMIN
  95 # define BLKIOMIN _IO(0x12,120)
  96 #endif
  97 #ifndef BLKIOOPT
  98 # define BLKIOOPT _IO(0x12,121)
  99 #endif
 100 #ifndef BLKALIGNOFF
 101 # define BLKALIGNOFF _IO(0x12,122)
 102 #endif
 103 #ifndef BLKPBSZGET
 104 # define BLKPBSZGET _IO(0x12,123)
 105 #endif
 106 #ifndef BLKDISCARDZEROES
 107 # define BLKDISCARDZEROES _IO(0x12,124)
 108 #endif
 109 #ifndef BLKSECDISCARD
 110 # define BLKSECDISCARD _IO(0x12,125)
 111 #endif
 112 #ifndef BLKROTATIONAL
 113 # define BLKROTATIONAL _IO(0x12,126)
 114 #endif
 115 #ifndef BLKZEROOUT
 116 # define BLKZEROOUT _IO(0x12,127)
 117 #endif
 118
 119 #include "xlat/blkpg_ops.h"
 120
 121 static void
 122 print_blkpg_req(struct tcb *tcp, const struct_blkpg_ioctl_arg *blkpg)
 123 {
 124         struct_blkpg_partition p;
 125
 126         tprints("{");
 127         printxval(blkpg_ops, blkpg->op, "BLKPG_???");
 128
 129         tprintf(", flags=%d, datalen=%d, data=",
 130                 blkpg->flags, blkpg->datalen);
 131
 132         if (!umove_or_printaddr(tcp, (long) blkpg->data, &p)) {
 133                 tprintf("{start=%lld, length=%lld, pno=%d, devname=",
 134                         (long long) p.start, (long long) p.length, p.pno);
 135                 print_quoted_string(p.devname, sizeof(p.devname),
 136                                     QUOTE_0_TERMINATED);
 137                 tprints(", volname=");
 138                 print_quoted_string(p.volname, sizeof(p.volname),
 139                                     QUOTE_0_TERMINATED);
 140                 tprints("}");
 141         }
 142         tprints("}");
 143 }
 144
 145 MPERS_PRINTER_DECL(int, block_ioctl, struct tcb *tcp,
 146                    const unsigned int code, const long arg)
 147 {
 148         switch (code) {
 149         /* take arg as a value, not as a pointer */
 150         case BLKRASET:
 151         case BLKFRASET:
 152                 tprintf(", %lu", arg);
 153                 break;
 154
 155         /* return an unsigned short */
 156         case BLKSECTGET:
 157         case BLKROTATIONAL:
 158                 if (entering(tcp))
 159                         return 0;
 160                 tprints(", ");
 161                 printnum_short(tcp, arg, "%hu");
 162                 break;
 163
 164         /* return a signed int */
 165         case BLKROGET:
 166         case BLKBSZGET:
 167         case BLKSSZGET:
 168         case BLKALIGNOFF:
 169                 if (entering(tcp))
 170                         return 0;
 171                 /* fall through */
 172         /* take a signed int */
 173         case BLKROSET:
 174         case BLKBSZSET:
 175                 tprints(", ");
 176                 printnum_int(tcp, arg, "%d");
 177                 break;
 178
 179         /* return an unsigned int */
 180         case BLKPBSZGET:
 181         case BLKIOMIN:
 182         case BLKIOOPT:
 183         case BLKDISCARDZEROES:
 184                 if (entering(tcp))
 185                         return 0;
 186                 tprints(", ");
 187                 printnum_int(tcp, arg, "%u");
 188                 break;
 189
 190         /* return a signed long */
 191         case BLKRAGET:
 192         case BLKFRAGET:
 193                 if (entering(tcp))
 194                         return 0;
 195                 tprints(", ");
 196                 printnum_slong(tcp, arg);
 197                 break;
 198
 199         /* returns an unsigned long */
 200         case BLKGETSIZE:
 201                 if (entering(tcp))
 202                         return 0;
 203                 tprints(", ");
 204                 printnum_ulong(tcp, arg);
 205                 break;
 206
 207 #ifdef HAVE_BLKGETSIZE64
 208         /* returns an uint64_t */
 209         case BLKGETSIZE64:
 210                 if (entering(tcp))
 211                         return 0;
 212                 tprints(", ");
 213                 printnum_int64(tcp, arg, "%" PRIu64);
 214                 break;
 215 #endif
 216
 217         /* takes a pair of uint64_t */
 218         case BLKDISCARD:
 219         case BLKSECDISCARD:
 220         case BLKZEROOUT:
 221                 tprints(", ");
 222                 printpair_int64(tcp, arg, "%" PRIu64);
 223                 break;
 224
 225         /* More complex types */
 226         case BLKPG: {
 227                 struct_blkpg_ioctl_arg blkpg;
 228
 229                 tprints(", ");
 230                 if (!umove_or_printaddr(tcp, arg, &blkpg))
 231                         print_blkpg_req(tcp, &blkpg);
 232                 break;
 233         }
 234
 235         case BLKTRACESETUP:
 236                 if (entering(tcp)) {
 237                         struct_blk_user_trace_setup buts;
 238
 239                         tprints(", ");
 240                         if (umove_or_printaddr(tcp, arg, &buts))
 241                                 break;
 242                         tprintf("{act_mask=%u, buf_size=%u, "
 243                                 "buf_nr=%u, start_lba=%" PRIu64 ", "
 244                                 "end_lba=%" PRIu64 ", pid=%u",
 245                                 (unsigned)buts.act_mask, buts.buf_size,
 246                                 buts.buf_nr, buts.start_lba,
 247                                 buts.end_lba, buts.pid);
 248                         return 1;
 249                 } else {
 250                         struct_blk_user_trace_setup buts;
 251
 252                         if (!syserror(tcp) && !umove(tcp, arg, &buts)) {
 253                                 tprints(", name=");
 254                                 print_quoted_string(buts.name, sizeof(buts.name),
 255                                                     QUOTE_0_TERMINATED);
 256                         }
 257                         tprints("}");
 258                         break;
 259                 }
 260
 261         /* No arguments */
 262         case BLKRRPART:
 263         case BLKFLSBUF:
 264         case BLKTRACESTART:
 265         case BLKTRACESTOP:
 266         case BLKTRACETEARDOWN:
 267                 break;
 268         default:
 269                 return RVAL_DECODED;
 270         }
 271
 272         return RVAL_DECODED | 1;
 273 }