1991/0927/port/devwren.c (diff list | history)

1991/0921/sys/src/9/port/devwren.c:7,24 – 1991/0927/sys/src/9/port/devwren.c:7,26 (short | long | prev | next)
1991/0110		#include "devtab.h" #include "io.h"
1991/0927		#define DATASIZE (8*1024)
1991/0823		typedef struct Partition Partition; typedef struct Drive Drive;
1991/0112
1991/0110		enum {
1991/0823		Npart= 8+2, /* 8 sub partitions, disk, and partition */
1991/0112		Ndisk= 64, /* maximum disks */
1991/0927		Ndisk= 64, /* maximum disks; must be power of 2 or change DRIVE */
1991/0110
1991/0823		/* file types */
1991/0112		Qdir= 0,
1991/0110		};
1991/0823		#define PART(x) ((x)&0xF) #define DRIVE(x) (((x)>>4)&0x7)
1991/0927		#define DRIVE(x) (((x)>>4)&(Ndisk-1))
1991/0823		#define MKQID(d,p) (((d)<<4) | (p))
1991/0110
1991/0823		struct Partition
1991/0921/sys/src/9/port/devwren.c:38,45 – 1991/0927/sys/src/9/port/devwren.c:40,45
1991/0110
1991/0823		static Drive wren[Ndisk];
1991/0110
1991/0423		#define DATASIZE (8*1024) /* BUG */
1991/0112
1991/0823		static void wrenpart(int); static long wrenio(Drive *, Partition *, int, char *, ulong, ulong);
1991/0115
1991/0921/sys/src/9/port/devwren.c:86,102 – 1991/0927/sys/src/9/port/devwren.c:86,104
1991/0823		ulong l;
1991/0112
1991/0823		qid.vers = 0; drive = s/Npart; s = s % Npart;
1991/0927		drive = c->dev;
1991/0823		if(drive >= Ndisk)
1991/0110		return -1;
1991/0823		dp = &wren[drive];
1991/0112
1991/0823		if(s >= dp->npart) return 0;
1991/0927		return -1;
1991/0823		pp = &dp->p[s]; sprint(name, "hd%d%s", drive, pp->name);
1991/0927		if(drive & 7) sprint(name, "hd%d.%d%s", drive>>3, drive&7, pp->name); else sprint(name, "hd%d%s", drive>>3, pp->name);
1991/0823		name[NAMELEN] = 0; qid.path = MKQID(drive, s); l = (pp->end - pp->start) * dp->bytes;
1991/0921/sys/src/9/port/devwren.c:188,193 – 1991/0927/sys/src/9/port/devwren.c:190,197
1991/0823		return devdirread(c, a, n, 0, 0, wrengen);
1991/0112
1991/0823		d = &wren[DRIVE(c->qid.path)];
1991/0927		if(d->npart == 0) errors("bad drive");
1991/0823		p = &d->p[PART(c->qid.path)]; return wrenio(d, p, 0, a, n, offset);
1991/0110		}
1991/0921/sys/src/9/port/devwren.c:199,204 – 1991/0927/sys/src/9/port/devwren.c:203,210
1991/0823		Partition *p; d = &wren[DRIVE(c->qid.path)];
1991/0927		if(d->npart == 0) errors("bad drive");
1991/0823		p = &d->p[PART(c->qid.path)]; return wrenio(d, p, 1, a, n, offset); }
1991/0921/sys/src/9/port/devwren.c:206,213 – 1991/0927/sys/src/9/port/devwren.c:212,218
1991/0823		static long wrenio(Drive *d, Partition *p, int write, char *a, ulong n, ulong offset) {
1991/0423		Scsi *cmd;
1991/0823		void *b;
1991/0927		Scsibuf *b;
1991/0823		ulong block;
1991/0112
1991/0823		if(n % d->bytes || offset % d->bytes)
1991/0921/sys/src/9/port/devwren.c:222,247 – 1991/0927/sys/src/9/port/devwren.c:227,246
1991/0823		n = p->end - block; if(n == 0) return 0; if(write) cmd = scsicmd(d->drive, 0x0a, n*d->bytes); else cmd = scsicmd(d->drive, 0x08, n*d->bytes);
1991/0927		b = scsibuf();
1991/0823		if(waserror()){
1991/0110		qunlock(cmd);
1991/0927		scsifree(b);
1991/0823		nexterror();
1991/0110		}
1991/0823		cmd->cmdblk[1] = block>>16; cmd->cmdblk[2] = block>>8; cmd->cmdblk[3] = block; cmd->cmdblk[4] = n; if(write) memmove(cmd->data.base, a, n*d->bytes); scsiexec(cmd, !write); n = cmd->data.ptr - cmd->data.base; if(!write) memmove(a, cmd->data.base, n); qunlock(cmd);
1991/0927		if(write){ memmove(b->virt, a, n*d->bytes); n = scsibwrite(d->drive, b, n, d->bytes, block); }else{ n = scsibread(d->drive, b, n, d->bytes, block); memmove(a, b->virt, n); }
1991/0823		poperror();
1991/0927		scsifree(b);
1991/0110		return n; }
1991/0921/sys/src/9/port/devwren.c:252,264 – 1991/0927/sys/src/9/port/devwren.c:251,261
1991/0823		static void wrenpart(int dev)
1991/0110		{
1991/0823		Scsi *cmd; Drive *dp; Partition *pp; uchar buf[32]; char *b; char *line[Npart+1]; char *field[3];
1991/0927		Scsibuf *b; char *rawpart, *line[Npart+1], *field[3];
1991/0823		ulong n; int i;
1991/0110
1991/0921/sys/src/9/port/devwren.c:267,274 – 1991/0927/sys/src/9/port/devwren.c:264,270
1991/0823		scsicap(dev, buf); dp = &wren[dev]; dp->drive = dev; if(dp->npart) return;
1991/0927
1991/0823		/* * we always have a partition for the whole disk * and one for the partition table
1991/0921/sys/src/9/port/devwren.c:287,325 – 1991/0927/sys/src/9/port/devwren.c:283,316
1991/0823		/* * read partition table from disk, null terminate */ cmd = scsicmd(dev, 0x08, dp->bytes);
1991/0927		b = scsibuf();
1991/0823		if(waserror()){ qunlock(cmd);
1991/0927		scsifree(b);
1991/0823		nexterror(); } n = dp->p[0].end-1; cmd->cmdblk[1] = n>>16; cmd->cmdblk[2] = n>>8; cmd->cmdblk[3] = n; cmd->cmdblk[4] = 1; scsiexec(cmd, 1); cmd->data.base[dp->bytes-1] = 0;
1991/0927		scsibread(dev, b, 1, dp->bytes, dp->p[0].end-1); rawpart = b->virt; rawpart[dp->bytes-1] = 0;
1991/0823		/* * parse partition table. */ n = getfields((char *)cmd->data.base, line, Npart+1, '\n'); if(strncmp(line[0], MAGIC, sizeof(MAGIC)-1) != 0) goto out; for(i = 1; i < n; i++){ pp++; if(getfields(line[i], field, 3, ' ') != 3){ break;
1991/0927		n = getfields(rawpart, line, Npart+1, '\n'); if(strncmp(line[0], MAGIC, sizeof(MAGIC)-1) == 0){ for(i = 1; i < n; i++){ pp++; if(getfields(line[i], field, 3, ' ') != 3){ break; } strncpy(pp->name, field[0], NAMELEN); pp->start = strtoul(field[1], 0, 0); pp->end = strtoul(field[2], 0, 0); if(pp->start > pp->end || pp->start >= dp->p[0].end){ break; } dp->npart++;
1991/0823		} strncpy(pp->name, field[0], NAMELEN); pp->start = strtoul(field[1], 0, 0); pp->end = strtoul(field[2], 0, 0); if(pp->start > pp->end || pp->start >= dp->p[0].end){ break; } dp->npart++; } out: qunlock(cmd); poperror();
1991/0927		scsifree(b);
1991/0110		}