Network Block Device  @PACKAGE_VERSION@
nbd-trdump.c
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1 /*
2  * nbd-trdump.c
3  *
4  * Takes an nbd transaction log file on stdin and translates it into something
5  * comprehensible
6  */
7 
8 #include <stdlib.h>
9 #include <stdio.h>
10 #include <string.h>
11 #include <sys/time.h>
12 #include <sys/types.h>
13 #include <stdint.h>
14 #include <unistd.h>
15 #include "config.h"
16 /* We don't want to do syslog output in this program */
17 #undef ISSERVER
18 #include "cliserv.h"
19 #include "nbd.h"
20 
21 static inline void doread(int f, void *buf, size_t len) {
22  ssize_t res;
23 
24  while(len>0) {
25  if((res=read(f, buf, len)) <=0) {
26  if (!res)
27  exit(0);
28  perror ("Error reading transactions");
29  exit(1);
30  }
31  len-=res;
32  buf+=res;
33  }
34 }
35 
36 int main(int argc, char**argv) {
37  struct nbd_request req;
38  struct nbd_reply rep;
39  uint32_t magic;
40  uint64_t handle;
41  uint32_t error;
42  uint32_t command;
43  uint32_t len;
44  uint64_t offset;
45  char * ctext;
46  int readfd = 0; /* stdin */
47 
48  if(argc > 1) {
49  int retval=0;
50  if(strcmp(argv[1], "--help") && strcmp(argv[1], "-h")) {
51  printf("E: unknown option %s.\n", argv[1]);
52  retval=1;
53  }
54  printf("This is nbd-trdump, part of nbd %s.\n", PACKAGE_VERSION);
55  printf("Use: %s < transactionlog\n", argv[0]);
56  return retval;
57  }
58 
59  while (1) {
60  /* Read a request or reply from the transaction file */
61  doread(readfd, &magic, sizeof(magic));
62  magic = ntohl(magic);
63  switch (magic) {
64  case NBD_REQUEST_MAGIC:
65  doread(readfd, sizeof(magic)+(char *)(&req), sizeof(struct nbd_request)-sizeof(magic));
66  handle = ntohll(*((long long int *)(req.handle)));
67  offset = ntohll(req.from);
68  len = ntohl(req.len);
69  command = ntohl(req.type);
70 
71  switch (command & NBD_CMD_MASK_COMMAND) {
72  case NBD_CMD_READ:
73  ctext="NBD_CMD_READ";
74  break;
75  case NBD_CMD_WRITE:
76  ctext="NBD_CMD_WRITE";
77  break;
78  case NBD_CMD_DISC:
79  ctext="NBD_CMD_DISC";
80  break;
81  case NBD_CMD_FLUSH:
82  ctext="NBD_CMD_FLUSH";
83  break;
84  default:
85  ctext="UNKNOWN";
86  break;
87  }
88  printf("> H=%016llx C=0x%08x (%13s+%4s) O=%016llx L=%08x\n",
89  (long long unsigned int) handle,
90  command,
91  ctext,
92  (command & NBD_CMD_FLAG_FUA)?"FUA":"NONE",
93  (long long unsigned int) offset,
94  len);
95 
96  break;
97  case NBD_REPLY_MAGIC:
98  doread(readfd, sizeof(magic)+(char *)(&rep), sizeof(struct nbd_reply)-sizeof(magic));
99  handle = ntohll(*((long long int *)(rep.handle)));
100  error = ntohl(rep.error);
101 
102  printf("< H=%016llx E=0x%08x\n",
103  (long long unsigned int) handle,
104  error);
105  break;
106 
107  default:
108  printf("? Unknown transaction type %08x\n",magic);
109  break;
110  }
111 
112  }
113  /* never reached */
114  return 0;
115 }
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