lustre/tests/parse_foreign_file.c

   1 #include <stdlib.h>
   2 #include <unistd.h>
   3 #include <limits.h>
   4 #include <stdio.h>
   5 #include <errno.h>
   6 #include <sys/ioctl.h>
   7 #include <sys/xattr.h>
   8 #include <sys/file.h>
   9 #include <sys/types.h>
  10 #include <sys/xattr.h>
  11 #include <byteswap.h>
  12
  13 #include <lustre/lustreapi.h>
  14
  15 int main(int argc, char **argv)
  16 {
  17         int c, i;
  18         char *fname = "FILE";
  19         size_t len, len2;
  20         struct lov_foreign_md *lfm;
  21
  22         while ((c = getopt(argc, argv, "f:")) != -1) {
  23                 switch (c) {
  24                 case 'f':
  25                         fname = optarg;
  26                         break;
  27                 case 'h':
  28                         fprintf(stderr, "Usage: %s -f <filename>\n", argv[0]);
  29                         break;
  30                 }
  31         }
  32
  33         len = getxattr(fname, "lustre.lov", NULL, 0);
  34         if (len == -1) {
  35                 perror("getxattr()");
  36                 exit(1);
  37         }
  38         if (len > XATTR_SIZE_MAX || len <= 0) {
  39                 fprintf(stderr,
  40                         "invalid LOV EA length %zu > XATTR_SIZE_MAX (%u)\n",
  41                         len, XATTR_SIZE_MAX);
  42                 exit(1);
  43         }
  44
  45         lfm = malloc(len);
  46         if (lfm == NULL) {
  47                 perror("malloc()");
  48                 exit(1);
  49         }
  50
  51         len2 = getxattr(fname, "lustre.lov", lfm, len);
  52         if (len2 == -1) {
  53                 perror("getxattr()");
  54                 exit(1);
  55         }
  56
  57         if (len != len2)
  58                 fprintf(stderr,
  59                         "trusted.lov xattr size changed, before=%zu now=%zu\n",
  60                         len, len2);
  61
  62         if (len2 < offsetof(struct lov_foreign_md, lfm_value)) {
  63                 fprintf(stderr, "trusted.lov size=%zu too small\n", len2);
  64                 fprintf(stderr, "printing its content in hex anyway:\n");
  65                 for (i = 0; i < len2; i++)
  66                         fprintf(stderr, "%02x", *((char *)lfm + i));
  67                 exit(1);
  68         }
  69
  70
  71         if (lfm->lfm_magic != LOV_USER_MAGIC_FOREIGN) {
  72                 if (lfm->lfm_magic == bswap_32(LOV_USER_MAGIC_FOREIGN))
  73                         fprintf(stderr, "magic is swapped\n");
  74                 else
  75                         fprintf(stderr, "wrong magic=(0x%x)\n", lfm->lfm_magic);
  76         }
  77
  78         if (lfm->lfm_length != len2 - offsetof(typeof(*lfm), lfm_value)) {
  79                 if (bswap_32(lfm->lfm_length) == len2 - offsetof(typeof(*lfm),
  80                     lfm_value))
  81                         fprintf(stderr, "length is swapped\n");
  82                 else
  83                         fprintf(stderr,
  84                                 "wrong internal length=%u vs xattr size=%zu\n",
  85                                 lfm->lfm_length, len2);
  86         }
  87
  88         if (lfm->lfm_magic == bswap_32(LOV_USER_MAGIC_FOREIGN)) {
  89                 lfm->lfm_magic = bswap_32(lfm->lfm_magic);
  90                 lfm->lfm_length = bswap_32(lfm->lfm_length);
  91                 lfm->lfm_type = bswap_32(lfm->lfm_type);
  92                 lfm->lfm_flags = bswap_32(lfm->lfm_flags);
  93         }
  94
  95         fprintf(stdout, "lov_xattr_size: %zu\n", len2);
  96         fprintf(stdout, "lov_foreign_magic: 0x%08X\n", lfm->lfm_magic);
  97         fprintf(stdout, "lov_foreign_size: %u\n", lfm->lfm_length);
  98         fprintf(stdout, "lov_foreign_type: %u\n", lfm->lfm_type);
  99         fprintf(stdout, "lov_foreign_flags: 0x%08X\n", lfm->lfm_flags);
 100         fprintf(stdout, "lov_foreign_value: 0x");
 101         for (i = 0; i < len2 - offsetof(typeof(*lfm), lfm_value); i++)
 102                 fprintf(stdout, "%02x", lfm->lfm_value[i]);
 103
 104         fprintf(stdout, "\n");
 105
 106         return 0;
 107 }