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/*
 * drive disks
 * used to be just scsi disks, and issued scsi commands directly to the host
 * adapter, but now it just does normal i/o.
 */
#include "all.h"

enum { Sectorsz = 512, };               /* usual disk sector size */

typedef struct  Wren    Wren;
struct  Wren
{
        long    block;                  /* size of a block -- from config */
        Devsize nblock;                 /* number of blocks -- from config */
        long    mult;                   /* multiplier to get physical blocks */
        Devsize max;                    /* number of logical blocks */

//      char    *sddir;                 /* /dev/sdXX name */
};

char *
dataof(char *file)
{
        char *datanm;
        Dir *dir;

        dir = dirstat(file);
        if (dir != nil && dir->mode & DMDIR)
                datanm = smprint("%s/data", file);
        else
                datanm = strdup(file);
        free(dir);
        return datanm;
}

void
wreninit(Device *d)
{
        Wren *dr;
        Dir *dir;

        if(d->private)
                return;
        d->private = dr = malloc(sizeof(Wren));

        if (d->wren.file)
                d->wren.sddata = dataof(d->wren.file);
        else {
                d->wren.sddir = sdof(d);
                d->wren.sddata = smprint("%s/data", d->wren.sddir);
        }

        assert(d->wren.fd <= 0);
        d->wren.fd = open(d->wren.sddata, ORDWR);
        if (d->wren.fd < 0)
                panic("wreninit: can't open %s for %Z: %r", d->wren.sddata, d);

        dr->block = inqsize(d->wren.sddata);
        if(dr->block <= 0 || dr->block >= 16*1024) {
                print("\twreninit %Z block size %ld, setting to %d\n",
                        d, dr->block, Sectorsz);
                dr->block = Sectorsz;
        }

        dir = dirfstat(d->wren.fd);
        dr->nblock = dir->length / dr->block;
        free(dir);

        dr->mult = (RBUFSIZE + dr->block - 1) / dr->block;
        dr->max = (dr->nblock + 1) / dr->mult;
        print("\tdisk drive %Z: %,lld %ld-byte sectors, ",
                d, (Wideoff)dr->nblock, dr->block);
        print("%,lld %d-byte blocks\n", (Wideoff)dr->max, RBUFSIZE);
        print("\t\t%ld multiplier\n", dr->mult);
}

Devsize
wrensize(Device *d)
{
        return ((Wren *)d->private)->max;
}

int
wrenread(Device *d, Off b, void *c)
{
        int r = 0;
        Wren *dr = d->private;

        if (dr == nil)
                panic("wrenread: no drive (%Z) block %lld", d, (Wideoff)b);
        if(b >= dr->max) {
                print("wrenread: block out of range %Z(%lld)\n", d, (Wideoff)b);
                r = 0x040;
        } else if (pread(d->wren.fd, c, RBUFSIZE, (vlong)b*RBUFSIZE) != RBUFSIZE) {
                print("wrenread: error on %Z(%lld): %r\n", d, (Wideoff)b);
                cons.nwrenre++;
                r = 1;
        }
        return r;
}

int
wrenwrite(Device *d, Off b, void *c)
{
        int r = 0;
        Wren *dr = d->private;

        if (dr == nil)
                panic("wrenwrite: no drive (%Z) block %lld", d, (Wideoff)b);
        if(b >= dr->max) {
                print("wrenwrite: block out of range %Z(%lld)\n",
                        d, (Wideoff)b);
                r = 0x040;
        } else if (pwrite(d->wren.fd, c, RBUFSIZE, (vlong)b*RBUFSIZE) != RBUFSIZE) {
                print("wrenwrite: error on %Z(%lld): %r\n", d, (Wideoff)b);
                cons.nwrenwe++;
                r = 1;
        }
        return r;
}