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

   1 /*
   2  * Copyright (c) 2016 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 #include <linux/ioctl.h>
  30 #include <linux/fs.h>
  31
  32 #ifdef HAVE_LINUX_FIEMAP_H
  33 # include <linux/fiemap.h>
  34 # include "xlat/fiemap_flags.h"
  35 # include "xlat/fiemap_extent_flags.h"
  36 #endif
  37
  38 #ifndef FICLONE
  39 # define FICLONE         _IOW(0x94, 9, int)
  40 #endif
  41
  42 #ifndef FICLONERANGE
  43 # define FICLONERANGE    _IOW(0x94, 13, struct file_clone_range)
  44 struct file_clone_range {
  45         int64_t src_fd;
  46         uint64_t src_offset;
  47         uint64_t src_length;
  48         uint64_t dest_offset;
  49 };
  50 #endif
  51
  52 #ifndef FIDEDUPERANGE
  53 # define FIDEDUPERANGE   _IOWR(0x94, 54, struct file_dedupe_range)
  54 struct file_dedupe_range_info {
  55         int64_t dest_fd;        /* in - destination file */
  56         uint64_t dest_offset;   /* in - start of extent in destination */
  57         uint64_t bytes_deduped; /* out - total # of bytes we were able
  58                                  * to dedupe from this file. */
  59         /* status of this dedupe operation:
  60          * < 0 for error
  61          * == FILE_DEDUPE_RANGE_SAME if dedupe succeeds
  62          * == FILE_DEDUPE_RANGE_DIFFERS if data differs
  63          */
  64         int32_t status;         /* out - see above description */
  65         uint32_t reserved;      /* must be zero */
  66 };
  67
  68 struct file_dedupe_range {
  69         uint64_t src_offset;    /* in - start of extent in source */
  70         uint64_t src_length;    /* in - length of extent */
  71         uint16_t dest_count;    /* in - total elements in info array */
  72         uint16_t reserved1;     /* must be zero */
  73         uint32_t reserved2;     /* must be zero */
  74         struct file_dedupe_range_info info[0];
  75 };
  76 #endif
  77
  78 static bool
  79 print_file_dedupe_range_info(struct tcb *tcp, void *elem_buf,
  80                              size_t elem_size, void *data)
  81 {
  82         const struct file_dedupe_range_info *info = elem_buf;
  83         unsigned int *count = data;
  84
  85         if (count) {
  86                 if (*count == 0) {
  87                         tprints("...");
  88                         return false;
  89                 }
  90                 --*count;
  91         }
  92
  93         if (entering(tcp)) {
  94                 tprints("{dest_fd=");
  95                 printfd(tcp, info->dest_fd);
  96                 tprintf(", dest_offset=%" PRIu64 "}",
  97                         (uint64_t) info->dest_offset);
  98         } else {
  99                 tprintf("{bytes_deduped=%" PRIu64 ", status=%d}",
 100                         (uint64_t) info->bytes_deduped, info->status);
 101         }
 102
 103         return true;
 104 }
 105
 106 #ifdef HAVE_LINUX_FIEMAP_H
 107 static bool
 108 print_fiemap_extent(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 109 {
 110         const struct fiemap_extent *fe = elem_buf;
 111
 112         tprintf("{fe_logical=%" PRI__u64
 113                 ", fe_physical=%" PRI__u64
 114                 ", fe_length=%" PRI__u64 ", ",
 115                 fe->fe_logical, fe->fe_physical, fe->fe_length);
 116
 117         printflags64(fiemap_extent_flags, fe->fe_flags,
 118                      "FIEMAP_EXTENT_???");
 119         tprints("}");
 120
 121         return true;
 122 }
 123 #endif /* HAVE_LINUX_FIEMAP_H */
 124
 125 int
 126 file_ioctl(struct tcb *tcp, const unsigned int code, const long arg)
 127 {
 128         switch (code) {
 129         case FICLONE:   /* W */
 130                 tprintf(", %d", (int) arg);
 131                 break;
 132
 133         case FICLONERANGE: { /* W */
 134                 struct file_clone_range args;
 135
 136                 tprints(", ");
 137                 if (umove_or_printaddr(tcp, arg, &args))
 138                         break;
 139
 140                 tprints("{src_fd=");
 141                 printfd(tcp, args.src_fd);
 142                 tprintf(", src_offset=%" PRIu64
 143                         ", src_length=%" PRIu64
 144                         ", dest_offset=%" PRIu64 "}",
 145                         (uint64_t) args.src_offset,
 146                         (uint64_t) args.src_length,
 147                         (uint64_t) args.dest_offset);
 148                 break;
 149         }
 150
 151         case FIDEDUPERANGE: { /* RW */
 152                 struct file_dedupe_range args;
 153                 struct file_dedupe_range_info info;
 154                 unsigned int *limit = NULL;
 155                 unsigned int count = 2;
 156                 bool rc;
 157
 158                 if (entering(tcp))
 159                         tprints(", ");
 160                 else if (syserror(tcp))
 161                         break;
 162                 else
 163                         tprints(" => ");
 164
 165                 if (umove_or_printaddr(tcp, arg, &args))
 166                         break;
 167
 168                 tprints("{");
 169                 if (entering(tcp)) {
 170                         tprintf("src_offset=%" PRIu64
 171                                 ", src_length=%" PRIu64
 172                                 ", dest_count=%hu, ",
 173                                 (uint64_t) args.src_offset,
 174                                 (uint64_t) args.src_length,
 175                                 (uint16_t) args.dest_count);
 176                 }
 177
 178                 tprints("info=");
 179
 180                 /* Limit how many elements we print in abbrev mode. */
 181                 if (abbrev(tcp) && args.dest_count > count)
 182                         limit = &count;
 183
 184                 rc = print_array(tcp, arg + offsetof(typeof(args), info),
 185                                  args.dest_count, &info, sizeof(info),
 186                                  umoven_or_printaddr,
 187                                  print_file_dedupe_range_info, limit);
 188
 189                 tprints("}");
 190                 if (!rc || exiting(tcp))
 191                         break;
 192
 193                 return 0;
 194         }
 195
 196 #ifdef HAVE_LINUX_FIEMAP_H
 197         case FS_IOC_FIEMAP: {
 198                 struct fiemap args;
 199
 200                 if (entering(tcp))
 201                         tprints(", ");
 202                 else if (syserror(tcp))
 203                         break;
 204                 else
 205                         tprints(" => ");
 206
 207                 if (umove_or_printaddr(tcp, arg, &args))
 208                         break;
 209
 210                 if (entering(tcp)) {
 211                         tprintf("{fm_start=%" PRI__u64 ", "
 212                                 "fm_length=%" PRI__u64 ", "
 213                                 "fm_flags=",
 214                                 args.fm_start, args.fm_length);
 215                         printflags64(fiemap_flags, args.fm_flags,
 216                                      "FIEMAP_FLAG_???");
 217                         tprintf(", fm_extent_count=%u}", args.fm_extent_count);
 218                         return 0;
 219                 }
 220
 221                 tprints("{fm_flags=");
 222                 printflags64(fiemap_flags, args.fm_flags,
 223                              "FIEMAP_FLAG_???");
 224                 tprintf(", fm_mapped_extents=%u",
 225                         args.fm_mapped_extents);
 226                 tprints(", fm_extents=");
 227                 if (abbrev(tcp)) {
 228                         tprints("...");
 229                 } else {
 230                         struct fiemap_extent fe;
 231                         print_array(tcp,
 232                                     arg + offsetof(typeof(args), fm_extents),
 233                                     args.fm_mapped_extents, &fe, sizeof(fe),
 234                                     umoven_or_printaddr,
 235                                     print_fiemap_extent, 0);
 236                 }
 237                 tprints("}");
 238
 239                 break;
 240         }
 241 #endif /* HAVE_LINUX_FIEMAP_H */
 242
 243         default:
 244                 return RVAL_DECODED;
 245         };
 246
 247         return RVAL_DECODED | 1;
 248 }