3 * used to be just scsi disks, and issued scsi commands directly to the host
4 * adapter, but now it just does normal i/o.
8 enum { Sectorsz = 512, }; /* usual disk sector size */
10 typedef struct Wren Wren;
13 long block; /* size of a block -- from config */
14 Devsize nblock; /* number of blocks -- from config */
15 long mult; /* multiplier to get physical blocks */
16 Devsize max; /* number of logical blocks */
26 if (dir != nil && dir->mode & DMDIR)
27 datanm = smprint("%s/data", file);
29 datanm = strdup(file);
42 d->private = dr = ialloc(sizeof(Wren), 0);
45 d->wren.sddata = dataof(d->wren.file);
47 d->wren.sddir = sdof(d);
48 d->wren.sddata = smprint("%s/data", d->wren.sddir);
51 d->wren.fd = open(d->wren.sddata, ORDWR);
53 panic("wreninit: can't open %s for %Z: %r", d->wren.sddata, d);
55 dr->block = inqsize(d->wren.sddata);
56 if(dr->block <= 0 || dr->block >= 16*1024) {
58 print("\twreninit %Z block size %ld, setting to %d\n",
59 d, dr->block, Sectorsz);
63 dir = dirfstat(d->wren.fd);
64 dr->nblock = dir->length / dr->block;
67 dr->mult = (RBUFSIZE + dr->block - 1) / dr->block;
68 dr->max = (dr->nblock + 1) / dr->mult;
70 print("\tdisk drive %Z: %,lld %ld-byte sectors, ",
71 d, (Wideoff)dr->nblock, dr->block);
72 print("%,lld %d-byte blocks\n", (Wideoff)dr->max, RBUFSIZE);
73 print("\t\t%ld multiplier\n", dr->mult);
80 return ((Wren *)d->private)->max;
84 wrenread(Device *d, Off b, void *c)
87 Wren *dr = d->private;
90 panic("wrenread: no drive (%Z) block %lld", d, (Wideoff)b);
92 fprint(2, "wrenread: block out of range %Z(%lld)\n", d, (Wideoff)b);
94 } else if (pread(d->wren.fd, c, RBUFSIZE, (vlong)b*RBUFSIZE) != RBUFSIZE) {
95 fprint(2, "wrenread: error on %Z(%lld): %r\n", d, (Wideoff)b);
103 wrenwrite(Device *d, Off b, void *c)
106 Wren *dr = d->private;
109 panic("wrenwrite: no drive (%Z) block %lld", d, (Wideoff)b);
111 fprint(2, "wrenwrite: block out of range %Z(%lld)\n",
114 } else if (pwrite(d->wren.fd, c, RBUFSIZE, (vlong)b*RBUFSIZE) != RBUFSIZE) {
115 fprint(2, "wrenwrite: error on %Z(%lld): %r\n", d, (Wideoff)b);