void
fdfinish(struct fd_softc *fd, struct buf *bp)
{
struct fdc_softc *fdc = (void *)fd->sc_dev.dv_parent;
splassert(IPL_BIO);
fd->sc_skip = 0;
fd->sc_bp = bufq_dequeue(&fd->sc_bufq);
/*
* Move this drive to the end of the queue to give others a `fair'
* chance. We only force a switch if N operations are completed while
* another drive is waiting to be serviced, since there is a long motor
* startup delay whenever we switch.
*/
if (TAILQ_NEXT(fd, sc_drivechain) != NULL && ++fd->sc_ops >= 8) {
fd->sc_ops = 0;
TAILQ_REMOVE(&fdc->sc_link.fdlink.sc_drives, fd, sc_drivechain);
if (fd->sc_bp != NULL) {
TAILQ_INSERT_TAIL(&fdc->sc_link.fdlink.sc_drives, fd,
sc_drivechain);
}
}
biodone(bp);
/* turn off motor 5s from now */
timeout_add_sec(&fd->fd_motor_off_to, 5);
fdc->sc_state = DEVIDLE;
}
void
fdstart(struct fd_softc *fd)
{
struct fdc_softc *fdc = (void *)fd->sc_dev.dv_parent;
int active = !TAILQ_EMPTY(&fdc->sc_link.fdlink.sc_drives);
/* Link into controller queue. */
fd->sc_bp = bufq_dequeue(&fd->sc_bufq);
TAILQ_INSERT_TAIL(&fdc->sc_link.fdlink.sc_drives, fd, sc_drivechain);
/* If controller not already active, start it. */
if (!active)
fdcstart(fdc);
}
/* ARGSUSED */
int
mfs_close(void *v)
{
struct vop_close_args *ap = v;
struct vnode *vp = ap->a_vp;
struct mfsnode *mfsp = VTOMFS(vp);
struct buf *bp;
int error;
/*
* Finish any pending I/O requests.
*/
while (1) {
bp = bufq_dequeue(&mfsp->mfs_bufq);
if (bp == NULL)
break;
mfs_doio(mfsp, bp);
wakeup(bp);
}
/*
* On last close of a memory filesystem we must invalidate any in
* core blocks, so that we can free up its vnode.
*/
if ((error = vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 0, 0)) != 0)
return (error);
#ifdef DIAGNOSTIC
/*
* There should be no way to have any more buffers on this vnode.
*/
if (bufq_peek(&mfsp->mfs_bufq))
printf("mfs_close: dirty buffers\n");
#endif
/*
* Send a request to the filesystem server to exit.
*/
mfsp->mfs_shutdown = 1;
wakeup(vp);
return (0);
}
/* ARGSUSED */
int
mfs_start(struct mount *mp, int flags, struct proc *p)
{
struct vnode *vp = VFSTOUFS(mp)->um_devvp;
struct mfsnode *mfsp = VTOMFS(vp);
struct buf *bp;
int sleepreturn = 0;
while (1) {
while (1) {
if (mfsp->mfs_shutdown == 1)
break;
bp = bufq_dequeue(&mfsp->mfs_bufq);
if (bp == NULL)
break;
mfs_doio(mfsp, bp);
wakeup(bp);
}
if (mfsp->mfs_shutdown == 1)
break;
/*
* If a non-ignored signal is received, try to unmount.
* If that fails, clear the signal (it has been "processed"),
* otherwise we will loop here, as tsleep will always return
* EINTR/ERESTART.
*/
if (sleepreturn != 0) {
if (vfs_busy(mp, VB_WRITE|VB_NOWAIT) ||
dounmount(mp,
(CURSIG(p) == SIGKILL) ? MNT_FORCE : 0, p, NULL))
CLRSIG(p, CURSIG(p));
sleepreturn = 0;
continue;
}
sleepreturn = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0);
}
return (0);
}
/*
* Queue a drive for I/O.
*/
void
wdstart(void *arg)
{
struct wd_softc *wd = arg;
struct buf *bp = NULL;
WDCDEBUG_PRINT(("wdstart %s\n", wd->sc_dev.dv_xname),
DEBUG_XFERS);
while (wd->openings > 0) {
/* Is there a buf for us ? */
if ((bp = bufq_dequeue(&wd->sc_bufq)) == NULL)
return;
/*
* Make the command. First lock the device
*/
wd->openings--;
wd->retries = 0;
__wdstart(wd, bp);
}
}
/*
* sdstart looks to see if there is a buf waiting for the device
* and that the device is not already busy. If both are true,
* It dequeues the buf and creates a scsi command to perform the
* transfer in the buf. The transfer request will call scsi_done
* on completion, which will in turn call this routine again
* so that the next queued transfer is performed.
* The bufs are queued by the strategy routine (sdstrategy)
*
* This routine is also called after other non-queued requests
* have been made of the scsi driver, to ensure that the queue
* continues to be drained.
*/
void
sdstart(struct scsi_xfer *xs)
{
struct scsi_link *link = xs->sc_link;
struct sd_softc *sc = link->device_softc;
struct buf *bp;
u_int64_t secno;
int nsecs;
int read;
struct partition *p;
if (sc->flags & SDF_DYING) {
scsi_xs_put(xs);
return;
}
if ((link->flags & SDEV_MEDIA_LOADED) == 0) {
bufq_drain(&sc->sc_bufq);
scsi_xs_put(xs);
return;
}
bp = bufq_dequeue(&sc->sc_bufq);
if (bp == NULL) {
scsi_xs_put(xs);
return;
}
secno = DL_BLKTOSEC(sc->sc_dk.dk_label, bp->b_blkno);
p = &sc->sc_dk.dk_label->d_partitions[DISKPART(bp->b_dev)];
secno += DL_GETPOFFSET(p);
nsecs = howmany(bp->b_bcount, sc->sc_dk.dk_label->d_secsize);
read = bp->b_flags & B_READ;
/*
* Fill out the scsi command. If the transfer will
* fit in a "small" cdb, use it.
*/
if (!(link->flags & SDEV_ATAPI) &&
!(link->quirks & SDEV_ONLYBIG) &&
((secno & 0x1fffff) == secno) &&
((nsecs & 0xff) == nsecs))
sd_cmd_rw6(xs, read, secno, nsecs);
else if (((secno & 0xffffffff) == secno) &&
((nsecs & 0xffff) == nsecs))
sd_cmd_rw10(xs, read, secno, nsecs);
else if (((secno & 0xffffffff) == secno) &&
((nsecs & 0xffffffff) == nsecs))
sd_cmd_rw12(xs, read, secno, nsecs);
else
sd_cmd_rw16(xs, read, secno, nsecs);
xs->flags |= (read ? SCSI_DATA_IN : SCSI_DATA_OUT);
xs->timeout = 60000;
xs->data = bp->b_data;
xs->datalen = bp->b_bcount;
xs->done = sd_buf_done;
xs->cookie = bp;
xs->bp = bp;
/* Instrumentation. */
disk_busy(&sc->sc_dk);
/* Mark disk as dirty. */
if (!read)
sc->flags |= SDF_DIRTY;
scsi_xs_exec(xs);
/* move onto the next io */
if (ISSET(sc->flags, SDF_WAITING))
CLR(sc->flags, SDF_WAITING);
else if (bufq_peek(&sc->sc_bufq))
scsi_xsh_add(&sc->sc_xsh);
}