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
 100 #include "xlat/blkpg_ops.h"
 101
 102 static void
 103 print_blkpg_req(struct tcb *tcp, const struct_blkpg_ioctl_arg *blkpg)
 104 {
 105         struct_blkpg_partition p;
 106
 107         tprints("{");
 108         printxval(blkpg_ops, blkpg->op, "BLKPG_???");
 109
 110         tprintf(", flags=%d, datalen=%d, data=",
 111                 blkpg->flags, blkpg->datalen);
 112
 113         if (!umove_or_printaddr(tcp, (long) blkpg->data, &p)) {
 114                 tprintf("{start=%lld, length=%lld, pno=%d, devname=",
 115                         (long long) p.start, (long long) p.length, p.pno);
 116                 print_quoted_string(p.devname, sizeof(p.devname),
 117                                     QUOTE_0_TERMINATED);
 118                 tprints(", volname=");
 119                 print_quoted_string(p.volname, sizeof(p.volname),
 120                                     QUOTE_0_TERMINATED);
 121                 tprints("}");
 122         }
 123         tprints("}");
 124 }
 125
 126 MPERS_PRINTER_DECL(int, block_ioctl, struct tcb *tcp,
 127                    const unsigned int code, const long arg)
 128 {
 129         switch (code) {
 130         /* take arg as a value, not as a pointer */
 131         case BLKRASET:
 132         case BLKFRASET:
 133                 tprintf(", %lu", arg);
 134                 break;
 135
 136         /* return an unsigned short */
 137         case BLKSECTGET:
 138         case BLKROTATIONAL:
 139                 if (entering(tcp))
 140                         return 0;
 141                 tprints(", ");
 142                 printnum_short(tcp, arg, "%hu");
 143                 break;
 144
 145         /* return a signed int */
 146         case BLKROGET:
 147         case BLKBSZGET:
 148         case BLKSSZGET:
 149         case BLKALIGNOFF:
 150                 if (entering(tcp))
 151                         return 0;
 152                 /* fall through */
 153         /* take a signed int */
 154         case BLKROSET:
 155         case BLKBSZSET:
 156                 tprints(", ");
 157                 printnum_int(tcp, arg, "%d");
 158                 break;
 159
 160         /* return an unsigned int */
 161         case BLKPBSZGET:
 162         case BLKIOMIN:
 163         case BLKIOOPT:
 164         case BLKDISCARDZEROES:
 165                 if (entering(tcp))
 166                         return 0;
 167                 tprints(", ");
 168                 printnum_int(tcp, arg, "%u");
 169                 break;
 170
 171         /* return a signed long */
 172         case BLKRAGET:
 173         case BLKFRAGET:
 174                 if (entering(tcp))
 175                         return 0;
 176                 tprints(", ");
 177                 printnum_slong(tcp, arg);
 178                 break;
 179
 180         /* returns an unsigned long */
 181         case BLKGETSIZE:
 182                 if (entering(tcp))
 183                         return 0;
 184                 tprints(", ");
 185                 printnum_ulong(tcp, arg);
 186                 break;
 187
 188 #ifdef HAVE_BLKGETSIZE64
 189         /* returns an uint64_t */
 190         case BLKGETSIZE64:
 191                 if (entering(tcp))
 192                         return 0;
 193                 tprints(", ");
 194                 printnum_int64(tcp, arg, "%" PRIu64);
 195                 break;
 196 #endif
 197
 198         /* takes a pair of uint64_t */
 199         case BLKDISCARD:
 200         case BLKSECDISCARD:
 201         case BLKZEROOUT:
 202                 tprints(", ");
 203                 printpair_int64(tcp, arg, "%" PRIu64);
 204                 break;
 205
 206         /* More complex types */
 207         case BLKPG: {
 208                 struct_blkpg_ioctl_arg blkpg;
 209
 210                 tprints(", ");
 211                 if (!umove_or_printaddr(tcp, arg, &blkpg))
 212                         print_blkpg_req(tcp, &blkpg);
 213                 break;
 214         }
 215
 216         case BLKTRACESETUP:
 217                 if (entering(tcp)) {
 218                         struct_blk_user_trace_setup buts;
 219
 220                         tprints(", ");
 221                         if (umove_or_printaddr(tcp, arg, &buts))
 222                                 break;
 223                         tprintf("{act_mask=%u, buf_size=%u, "
 224                                 "buf_nr=%u, start_lba=%" PRIu64 ", "
 225                                 "end_lba=%" PRIu64 ", pid=%u",
 226                                 (unsigned)buts.act_mask, buts.buf_size,
 227                                 buts.buf_nr, buts.start_lba,
 228                                 buts.end_lba, buts.pid);
 229                         return 1;
 230                 } else {
 231                         struct_blk_user_trace_setup buts;
 232
 233                         if (!syserror(tcp) && !umove(tcp, arg, &buts)) {
 234                                 tprints(", name=");
 235                                 print_quoted_string(buts.name, sizeof(buts.name),
 236                                                     QUOTE_0_TERMINATED);
 237                         }
 238                         tprints("}");
 239                         break;
 240                 }
 241
 242         /* No arguments */
 243         case BLKRRPART:
 244         case BLKFLSBUF:
 245         case BLKTRACESTART:
 246         case BLKTRACESTOP:
 247         case BLKTRACETEARDOWN:
 248                 break;
 249         default:
 250                 return RVAL_DECODED;
 251         }
 252
 253         return RVAL_DECODED | 1;
 254 }