static int cmd_cache(char *args)
{
bool success;
uint32_t tmpAddr = expr(args, &success);
printf("addr:%x:%x cache_total:%u cache_nothit:%u\n", tmpAddr, readcache(tmpAddr, 4), cache.total, cache.nothitnum);
return 0;
}
ssize_t pfs_read(int filedes, void *buf, ssize_t nbyte, off_t offset, int *cache_hit)
{//READ filename w offset length END.
*cache_hit = readcache(filedes, offset, nbyte);//what's the usage of filedes here????
if(*cache_hit)
return nbyte;//cachehit
int ofI = 0;
while((ofI < ofnum)&&(openfiles[ofI]->fd != filedes))
ofI++;
if(ofI == ofnum)
return -1;
OpenFile* of = openfiles[ofI];
char spacket[BUFFER_SIZE]; //Buffer for client data
/*
char Offset[7];
char Length[7];
strcat(spacket,"READ ");
strcat(spacket, of->filename);
int2str(offset/ONEKB,Offset,10);
int2str(nbyte/ONEKB,Length,10);
strcat(spacket, Offset);
strcat(spacket, " ");
strcat(spacket, Length);
strcat(spacket, " ");
strcat(spacket," END.");
if (send(mmFD, spacket, sizeof(spacket), 0) == -1) //READ pfs_file1 offset length END.
perror("Error in sending!");
char rpacket[BUFFER_SIZE] = ""; //Buffer for client data
int size = MMR(rpacket, BUFFER_SIZE);//READ filename offset length END.
*/
//offset ... nbyte
//start = fsoffset + offset/(size*ONEKB), offset -> fsoffset + (offset+length)/(size*ONEKB)
//first: offset % (size*ONEKB) -> min(offset+length, size*ONEKB)
//intermediates:
//last: 0 -> (offset+length)%(size*ONEKB)
unsigned fsstart, from, to, plen;
unsigned os = offset;
unsigned len = nbyte;
int i;
for(i= of->fsoffset + (offset/(STRIP_SIZE*ONEKB)); (i-of->fsoffset)*(STRIP_SIZE*ONEKB) < (offset+nbyte); i++)
{//Send for each FSs -> READ pfs_file1 w from to(plen) END.
//if (!fork())
//{ // this is the child process
// close(myTFD); // child doesn't need the listener
strcpy(spacket,"READ ");
strcat(spacket, of->filename);
strcat(spacket, " ");
strcat(spacket, of->mode);
strcat(spacket, " ");
//0 ,1 ,2 ,3 + 4 ,5 ,6 ,7 + 8 ,9 ,10,11
//12,13,14,15 + 16,17,18,19 + 20,21,22,23
//24,25,26,27 + 28,29,30,31 + 32,33,34,35
//os=19->32 -> l=13, i=4, sw=3,
fsstart = (i/of->stripe_width)*(STRIP_SIZE*ONEKB);
from = fsstart + os%(STRIP_SIZE*ONEKB);
to = fsstart + min(os%(STRIP_SIZE*ONEKB)+len, STRIP_SIZE*ONEKB);
plen = to - from;
char From[10];
char PLen[10];
int2str(from, From, 10);
int2str(plen, PLen, 10);
strcat(spacket, From);
strcat(spacket, " ");
strcat(spacket, PLen);
strcat(spacket, " END.");
if (send(fs[i%of->stripe_width].fd, spacket, sizeof(spacket), 0) == -1)
perror("Error in sending!");
// close(newfd);
// exit(0);
//}
int size;
char rpacket[plen]; //Buffer for client data
if ((size = recv(fs[i%of->stripe_width].fd, rpacket, sizeof(rpacket), 0)) == -1)
perror("Error in receiving!");
rpacket[size] = '\0';
printf("Server: %s\n",rpacket);
strncat(buf, rpacket, plen);
save2cache(filedes,os,plen);
os += plen;
len -= plen;
}
return nbyte;
}
