make-integrityhuge.c

   1 /*
   2  * make-integrityhuge
   3  *
   4  * Make a file to test oversize writes
   5  */
   6
   7 #include <stdlib.h>
   8 #include <stdio.h>
   9 #include <string.h>
  10 #include <sys/time.h>
  11 #include <sys/types.h>
  12 #include <stdint.h>
  13 #include <unistd.h>
  14 #include "config.h"
  15 #include "cliserv.h"
  16 #include "nbd.h"
  17
  18 const uint64_t filesize=50*1000*1000;
  19 const uint64_t transactions = 250;
  20
  21 static inline void dowrite(int f, void *buf, size_t len) {
  22         ssize_t res;
  23
  24         while(len>0) {
  25                 if((res=write(f, buf, len)) <=0) {
  26                         perror ("Error writing transactions");
  27                         exit(1);
  28                 }
  29                 len-=res;
  30                 buf+=res;
  31         }
  32 }
  33
  34 static inline uint64_t getrandomuint64() {
  35         uint64_t r=0;
  36         int i;
  37         /* RAND_MAX may be as low as 2^15 */
  38         for (i= 1 ; i<=5; i++)
  39                 r ^= random() ^ (r << 15);
  40         return r;
  41 }
  42
  43 int main(int argc, char**argv) {
  44         struct nbd_request req;
  45         struct nbd_reply rep;
  46         uint64_t handle;
  47         int writefd = 1; /*stdout*/
  48
  49         req.magic = htonl(NBD_REQUEST_MAGIC);
  50         rep.magic = htonl(NBD_REPLY_MAGIC);
  51         rep.error = 0;
  52
  53         for (handle = 0; handle < transactions; handle++)
  54         {
  55                 uint64_t offset;
  56                 uint64_t length;
  57                 uint64_t flags;
  58                 uint32_t command;
  59
  60                 /* make the length between 0x400 and the length of the disk -08x800, with all
  61                  * the bottom bits clear */
  62                 length = ((getrandomuint64() % (filesize-0x800)) & ~((uint64_t)0x3ff)) + 0x400;
  63                 /* generate an offset that will fit the length */
  64                 offset = (getrandomuint64() % (filesize-length)) & ~((uint64_t)0x3ff);
  65                 flags = getrandomuint64();
  66
  67                 command = (flags & 0x01)?NBD_CMD_READ:NBD_CMD_WRITE;
  68
  69                 if (!(flags & 0x0f))
  70                         command = NBD_CMD_FLAG_FUA | NBD_CMD_WRITE;
  71
  72                 if (!(flags & 0xf0)) {
  73                         offset = 0;
  74                         length = 0;
  75                         command = NBD_CMD_FLUSH;
  76                 }
  77
  78                 *(uint64_t *)(req.handle) = htonll(handle);
  79                 *(uint64_t *)(rep.handle) = htonll(handle);
  80                 req.type = htonl(command);
  81                 req.from = htonll(offset);
  82                 req.len = htonl(length);
  83
  84                 dowrite(writefd, &req, sizeof(req));
  85                 dowrite(writefd, &rep, sizeof(rep));
  86         }
  87
  88         req.type = htonl(NBD_CMD_DISC);
  89         req.from = 0;
  90         req.len = 0;
  91         dowrite(writefd, &req, sizeof(req));
  92
  93         return 0;
  94 }