1 0c98da8b 2005-07-13 devnull #include <u.h>
  2 0c98da8b 2005-07-13 devnull #include <libc.h>
  3 0c98da8b 2005-07-13 devnull #include <diskfs.h>
  4 0c98da8b 2005-07-13 devnull 
  5 d3285dcb 2005-12-16 devnull int nfilereads;
  6 6519f895 2007-11-05 rsc void _nfilereads_darwin_sucks(void) { }
  7 d3285dcb 2005-12-16 devnull 
  8 0c98da8b 2005-07-13 devnull typedef struct DiskFile DiskFile;
  9 0c98da8b 2005-07-13 devnull struct DiskFile
 10 0c98da8b 2005-07-13 devnull {
 11 0c98da8b 2005-07-13 devnull 	Disk disk;
 12 0c98da8b 2005-07-13 devnull 	int fd;
 13 0c98da8b 2005-07-13 devnull };
 14 0c98da8b 2005-07-13 devnull 
 15 0c98da8b 2005-07-13 devnull static long
 16 0c98da8b 2005-07-13 devnull preadn(int fd, void *vdata, u32int ulen, u64int offset)
 17 0c98da8b 2005-07-13 devnull {
 18 0c98da8b 2005-07-13 devnull 	long n;
 19 0c98da8b 2005-07-13 devnull 	uchar *data;
 20 0c98da8b 2005-07-13 devnull 	long len;
 21 0c98da8b 2005-07-13 devnull 
 22 0c98da8b 2005-07-13 devnull 	nfilereads++;
 23 0c98da8b 2005-07-13 devnull 	len = ulen;
 24 0c98da8b 2005-07-13 devnull 	data = vdata;
 25 cbeb0b26 2006-04-01 devnull /*	fprint(2, "readn 0x%llux 0x%ux\n", offset, ulen); */
 26 0c98da8b 2005-07-13 devnull 	while(len > 0){
 27 0c98da8b 2005-07-13 devnull 		n = pread(fd, data, len, offset);
 28 0c98da8b 2005-07-13 devnull 		if(n <= 0)
 29 0c98da8b 2005-07-13 devnull 			break;
 30 0c98da8b 2005-07-13 devnull 		data += n;
 31 0c98da8b 2005-07-13 devnull 		offset += n;
 32 0c98da8b 2005-07-13 devnull 		len -= n;
 33 0c98da8b 2005-07-13 devnull 	}
 34 0c98da8b 2005-07-13 devnull 	return data-(uchar*)vdata;
 35 0c98da8b 2005-07-13 devnull }
 36 0c98da8b 2005-07-13 devnull 
 37 0c98da8b 2005-07-13 devnull static void
 38 0c98da8b 2005-07-13 devnull diskfileblockput(Block *b)
 39 0c98da8b 2005-07-13 devnull {
 40 0c98da8b 2005-07-13 devnull 	free(b);
 41 0c98da8b 2005-07-13 devnull }
 42 0c98da8b 2005-07-13 devnull 
 43 0c98da8b 2005-07-13 devnull uvlong nreadx;
 44 0c98da8b 2005-07-13 devnull static Block*
 45 0c98da8b 2005-07-13 devnull diskfileread(Disk *dd, u32int len, u64int offset)
 46 0c98da8b 2005-07-13 devnull {
 47 0c98da8b 2005-07-13 devnull 	int n;
 48 0c98da8b 2005-07-13 devnull 	Block *b;
 49 0c98da8b 2005-07-13 devnull 	DiskFile *d = (DiskFile*)dd;
 50 0c98da8b 2005-07-13 devnull 
 51 0c98da8b 2005-07-13 devnull 	b = mallocz(sizeof(Block)+len, 1);
 52 0c98da8b 2005-07-13 devnull 	if(b == nil)
 53 0c98da8b 2005-07-13 devnull 		return nil;
 54 0c98da8b 2005-07-13 devnull 	b->data = (uchar*)&b[1];
 55 0c98da8b 2005-07-13 devnull nreadx += len;
 56 0c98da8b 2005-07-13 devnull 	n = preadn(d->fd, b->data, len, offset);
 57 0c98da8b 2005-07-13 devnull 	if(n <= 0){
 58 0c98da8b 2005-07-13 devnull 		free(b);
 59 0c98da8b 2005-07-13 devnull 		return nil;
 60 0c98da8b 2005-07-13 devnull 	}
 61 0c98da8b 2005-07-13 devnull 	b->_close = diskfileblockput;
 62 0c98da8b 2005-07-13 devnull 	b->len = n;
 63 0c98da8b 2005-07-13 devnull 	return b;
 64 0c98da8b 2005-07-13 devnull }
 65 0c98da8b 2005-07-13 devnull 
 66 0c98da8b 2005-07-13 devnull static int
 67 0c98da8b 2005-07-13 devnull diskfilesync(Disk *dd)
 68 0c98da8b 2005-07-13 devnull {
 69 0c98da8b 2005-07-13 devnull 	USED(dd);
 70 0c98da8b 2005-07-13 devnull 	return 0;
 71 0c98da8b 2005-07-13 devnull }
 72 0c98da8b 2005-07-13 devnull 
 73 0c98da8b 2005-07-13 devnull static void
 74 0c98da8b 2005-07-13 devnull diskfileclose(Disk *dd)
 75 0c98da8b 2005-07-13 devnull {
 76 0c98da8b 2005-07-13 devnull 	DiskFile *d = (DiskFile*)dd;
 77 0c98da8b 2005-07-13 devnull 
 78 0c98da8b 2005-07-13 devnull 	close(d->fd);
 79 0c98da8b 2005-07-13 devnull 	free(d);
 80 0c98da8b 2005-07-13 devnull }
 81 0c98da8b 2005-07-13 devnull 
 82 0c98da8b 2005-07-13 devnull Disk*
 83 0c98da8b 2005-07-13 devnull diskopenfile(char *file)
 84 0c98da8b 2005-07-13 devnull {
 85 0c98da8b 2005-07-13 devnull 	int fd;
 86 0c98da8b 2005-07-13 devnull 	DiskFile *d;
 87 0c98da8b 2005-07-13 devnull 
 88 0c98da8b 2005-07-13 devnull 	if((fd = open(file, OREAD)) < 0)
 89 0c98da8b 2005-07-13 devnull 		return nil;
 90 0c98da8b 2005-07-13 devnull 	d = mallocz(sizeof(DiskFile), 1);
 91 0c98da8b 2005-07-13 devnull 	if(d == nil){
 92 0c98da8b 2005-07-13 devnull 		close(fd);
 93 0c98da8b 2005-07-13 devnull 		return nil;
 94 0c98da8b 2005-07-13 devnull 	}
 95 0c98da8b 2005-07-13 devnull 	d->disk._read = diskfileread;
 96 0c98da8b 2005-07-13 devnull 	d->disk._sync = diskfilesync;
 97 0c98da8b 2005-07-13 devnull 	d->disk._close = diskfileclose;
 98 0c98da8b 2005-07-13 devnull 	d->fd = fd;
 99 0c98da8b 2005-07-13 devnull 	return &d->disk;
100 0c98da8b 2005-07-13 devnull }