buffer invalidate routine and checks for B_INVAL flag

[unix-history] / usr / src / sys / kern / kern_physio.c

diff --git a/usr/src/sys/kern/kern_physio.c b/usr/src/sys/kern/kern_physio.c
index 57e76d0..ef91a45 100644 (file)
--- a/usr/src/sys/kern/kern_physio.c
+++ b/usr/src/sys/kern/kern_physio.c
@@ -1,4 +1,4 @@
-/*     kern_physio.c   4.1     %G%     */
+/*     kern_physio.c   4.5     %G%     */

 
 #include "../h/param.h"
 #include "../h/systm.h"
 
 #include "../h/param.h"
 #include "../h/systm.h"


@@ -10,6 +10,7 @@
 #include "../h/seg.h"
 #include "../h/pte.h"
 #include "../h/vm.h"
 #include "../h/seg.h"
 #include "../h/pte.h"
 #include "../h/vm.h"

+#include "../h/trace.h"

 
 /*
  * The following several routines allocate and free
 
 /*
  * The following several routines allocate and free


@@ -99,6 +100,9 @@ daddr_t blkno;
 
        bp = getblk(dev, blkno);
        if (bp->b_flags&B_DONE) {
 
        bp = getblk(dev, blkno);
        if (bp->b_flags&B_DONE) {

+#ifdef EPAWNJ
+               trace(TR_BREAD|TR_HIT, dev, blkno);
+#endif

 #ifdef DISKMON
                io_info.ncache++;
 #endif
 #ifdef DISKMON
                io_info.ncache++;
 #endif


@@ -107,6 +111,9 @@ daddr_t blkno;
        bp->b_flags |= B_READ;
        bp->b_bcount = BSIZE;
        (*bdevsw[major(dev)].d_strategy)(bp);
        bp->b_flags |= B_READ;
        bp->b_bcount = BSIZE;
        (*bdevsw[major(dev)].d_strategy)(bp);

+#ifdef EPAWNJ
+       trace(TR_BREAD|TR_MISS, dev, blkno);
+#endif

 #ifdef DISKMON
        io_info.nread++;
 #endif
 #ifdef DISKMON
        io_info.nread++;
 #endif


@@ -133,20 +140,33 @@ daddr_t blkno, rablkno;
                        bp->b_flags |= B_READ;
                        bp->b_bcount = BSIZE;
                        (*bdevsw[major(dev)].d_strategy)(bp);
                        bp->b_flags |= B_READ;
                        bp->b_bcount = BSIZE;
                        (*bdevsw[major(dev)].d_strategy)(bp);

+#ifdef EPAWNJ
+                       trace(TR_BREAD|TR_MISS, dev, blkno);
+#endif

 #ifdef DISKMON
                        io_info.nread++;
 #endif
                        u.u_vm.vm_inblk++;              /* pay for read */
                }
 #ifdef DISKMON
                        io_info.nread++;
 #endif
                        u.u_vm.vm_inblk++;              /* pay for read */
                }

+#ifdef EPAWNJ
+               else
+                       trace(TR_BREAD|TR_HIT, dev, blkno);
+#endif

        }
        if (rablkno && !incore(dev, rablkno)) {
                rabp = getblk(dev, rablkno);
        }
        if (rablkno && !incore(dev, rablkno)) {
                rabp = getblk(dev, rablkno);

-               if (rabp->b_flags & B_DONE)
+               if (rabp->b_flags & B_DONE) {

                        brelse(rabp);
                        brelse(rabp);

-               else {
+#ifdef EPAWNJ
+                       trace(TR_BREAD|TR_HIT|TR_RA, dev, blkno);
+#endif
+               } else {

                        rabp->b_flags |= B_READ|B_ASYNC;
                        rabp->b_bcount = BSIZE;
                        (*bdevsw[major(dev)].d_strategy)(rabp);
                        rabp->b_flags |= B_READ|B_ASYNC;
                        rabp->b_bcount = BSIZE;
                        (*bdevsw[major(dev)].d_strategy)(rabp);

+#ifdef EPAWNJ
+                       trace(TR_BREAD|TR_MISS|TR_RA, dev, rablock);
+#endif

 #ifdef DISKMON
                        io_info.nreada++;
 #endif
 #ifdef DISKMON
                        io_info.nreada++;
 #endif


@@ -176,6 +196,9 @@ register struct buf *bp;
 #endif
        if ((flag&B_DELWRI) == 0)
                u.u_vm.vm_oublk++;              /* noone paid yet */
 #endif
        if ((flag&B_DELWRI) == 0)
                u.u_vm.vm_oublk++;              /* noone paid yet */

+#ifdef EPAWNJ
+       trace(TR_BWRITE, bp->b_dev, dbtofsb(bp->b_blkno));
+#endif

        (*bdevsw[major(bp->b_dev)].d_strategy)(bp);
        if ((flag&B_ASYNC) == 0) {
                iowait(bp);
        (*bdevsw[major(bp->b_dev)].d_strategy)(bp);
        if ((flag&B_ASYNC) == 0) {
                iowait(bp);


@@ -271,7 +294,8 @@ daddr_t blkno;
 
        for (bp = &buf[bufhash[BUFHASH(blkno)]]; bp != &buf[-1];
            bp = &buf[bp->b_hlink])
 
        for (bp = &buf[bufhash[BUFHASH(blkno)]]; bp != &buf[-1];
            bp = &buf[bp->b_hlink])

-               if (bp->b_blkno == dblkno && bp->b_dev == dev)
+               if (bp->b_blkno == dblkno && bp->b_dev == dev
+                                       && !(bp->b_flags & B_INVAL))

                        return (1);
        return (0);
 }
                        return (1);
        return (0);
 }


@@ -298,14 +322,17 @@ dev_t dev;
 daddr_t blkno;
 {
        register struct buf *bp, *dp, *ep;
 daddr_t blkno;
 {
        register struct buf *bp, *dp, *ep;

-       register int i, x;
-       register int dblkno = fsbtodb(blkno);
+       register int i, x, dblkno;

 
 

+       if ((unsigned)blkno >= 1 << (sizeof(int)*NBBY-PGSHIFT))
+               blkno = 1 << ((sizeof(int)*NBBY-PGSHIFT) + 1);
+       dblkno = fsbtodb(blkno);

     loop:
        (void) spl0();
        for (bp = &buf[bufhash[BUFHASH(blkno)]]; bp != &buf[-1];
            bp = &buf[bp->b_hlink]) {
     loop:
        (void) spl0();
        for (bp = &buf[bufhash[BUFHASH(blkno)]]; bp != &buf[-1];
            bp = &buf[bp->b_hlink]) {

-               if (bp->b_blkno != dblkno || bp->b_dev != dev)
+               if (bp->b_blkno != dblkno || bp->b_dev != dev
+                                       || bp->b_flags & B_INVAL)

                        continue;
                (void) spl6();
                if (bp->b_flags&B_BUSY) {
                        continue;
                (void) spl6();
                if (bp->b_flags&B_BUSY) {


@@ -339,7 +366,7 @@ daddr_t blkno;
                sleep((caddr_t)&bfreelist, PRIBIO+1);
                goto loop;
        }
                sleep((caddr_t)&bfreelist, PRIBIO+1);
                goto loop;
        }

-       spl0();
+       (void) spl0();

        bp = bfreelist.av_forw;
        notavail(bp);
        if (bp->b_flags & B_DELWRI) {
        bp = bfreelist.av_forw;
        notavail(bp);
        if (bp->b_flags & B_DELWRI) {


@@ -350,6 +377,9 @@ daddr_t blkno;
        if (bp->b_dev == NODEV)
                goto done;
        /* INLINE EXPANSION OF bunhash(bp) */
        if (bp->b_dev == NODEV)
                goto done;
        /* INLINE EXPANSION OF bunhash(bp) */

+#ifdef EPAWNJ
+       trace(TR_BRELSE, bp->b_dev, dbtofsb(bp->b_blkno));
+#endif

        (void) spl6();
        i = BUFHASH(dbtofsb(bp->b_blkno));
        x = bp - buf;
        (void) spl6();
        i = BUFHASH(dbtofsb(bp->b_blkno));
        x = bp - buf;


@@ -406,8 +436,12 @@ loop:
                bwrite(bp);
                goto loop;
        }
                bwrite(bp);
                goto loop;
        }

-       if (bp->b_dev != NODEV)
+       if (bp->b_dev != NODEV) {
+#ifdef EPAWNJ
+               trace(TR_BRELSE, bp->b_dev, dbtofsb(bp->b_blkno));
+#endif

                bunhash(bp);
                bunhash(bp);

+       }

        bp->b_flags = B_BUSY;
        bp->b_back->b_forw = bp->b_forw;
        bp->b_forw->b_back = bp->b_back;
        bp->b_flags = B_BUSY;
        bp->b_back->b_forw = bp->b_forw;
        bp->b_forw->b_back = bp->b_back;


@@ -762,3 +796,26 @@ register struct buf *bp;
                if ((u.u_error = bp->b_error)==0)
                        u.u_error = EIO;
 }
                if ((u.u_error = bp->b_error)==0)
                        u.u_error = EIO;
 }

+
+/*
+ * Invalidate in core blocks belonging to closed or umounted filesystem
+ *
+ * This is not nicely done at all - the buffer ought to be removed from the
+ * hash chains & have its dev/blkno fields clobbered, but unfortunately we
+ * can't do that here, as it is quite possible that the block is still
+ * being used for i/o. Eventually, all disc drivers should be forced to
+ * have a close routine, which ought ensure that the queue is empty, then
+ * properly flush the queues. Until that happy day, this suffices for
+ * correctness.                                                ... kre
+ */
+binval(dev)
+dev_t dev;
+{
+       register struct buf *bp, *dp;
+
+       dp = bdevsw[major(dev)].d_tab;
+
+       for (bp = dp->b_forw; bp != dp; bp = bp->b_forw)
+               if (bp->b_dev == dev)
+                       bp->b_flags |= B_INVAL;
+}