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physio:

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- update uio_resid properly.
- don't miss i/o errors near the end of partition.
This commit is contained in:
yamt 2005-11-04 08:39:33 +00:00
parent 0fbb37df6f
commit 5936836bb1
1 changed files with 25 additions and 32 deletions
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57
sys/kern/kern_physio.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_physio.c,v 1.65 2005/10/31 14:36:41 yamt Exp $ */
/* $NetBSD: kern_physio.c,v 1.66 2005/11/04 08:39:33 yamt Exp $ */
/*-
* Copyright (c) 1982, 1986, 1990, 1993
@ -71,7 +71,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_physio.c,v 1.65 2005/10/31 14:36:41 yamt Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_physio.c,v 1.66 2005/11/04 08:39:33 yamt Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -100,7 +100,7 @@ struct workqueue *physio_workqueue;
/* abuse these members/flags of struct buf */
#define b_running b_freelistindex
#define b_eomoffset b_lblkno
#define b_endoffset b_lblkno
#define B_DONTFREE B_AGE
/*
@ -145,6 +145,7 @@ physio_done(struct work *wk, void *dummy)
{
struct buf *bp = (void *)wk;
size_t todo = bp->b_bufsize;
size_t done = bp->b_bcount - bp->b_resid;
struct buf *mbp = bp->b_private;
KASSERT(&bp->b_work == wk);
@ -157,10 +158,22 @@ physio_done(struct work *wk, void *dummy)
uvm_vsunlock(bp->b_proc, bp->b_data, todo);
simple_lock(&mbp->b_interlock);
if ((mbp->b_flags & B_ERROR) != 0) {
goto done;
if (__predict_false(done != todo)) {
off_t endoffset = dbtob(bp->b_blkno) + done;
if (mbp->b_endoffset == -1 || endoffset < mbp->b_endoffset) {
mbp->b_endoffset = endoffset;
}
mbp->b_flags |= B_ERROR;
}
if ((bp->b_flags & B_ERROR) != 0) {
/*
* EINVAL is not very important as it happens for i/o past the end
* of the partition.
*/
if (__predict_false((bp->b_flags & B_ERROR) != 0 &&
((mbp->b_flags & B_ERROR) == 0 || mbp->b_error == EINVAL))) {
if (bp->b_error == 0) {
mbp->b_error = EIO; /* XXX */
} else {
@ -169,23 +182,7 @@ physio_done(struct work *wk, void *dummy)
mbp->b_flags |= B_ERROR;
goto done;
}
KASSERT(bp->b_resid == 0); /* XXX */
if (bp->b_bcount != todo) {
#if defined(DIAGNOSTIC)
off_t eomoffset = dbtob(bp->b_blkno);
if ((mbp->b_flags & B_ERROR) != 0 &&
mbp->b_eomoffset != eomoffset) {
panic("%s: eom mismatch", __func__);
}
mbp->b_eomoffset = eomoffset;
#endif /* defined(DIAGNOSTIC) */
mbp->b_flags |= B_ERROR;
mbp->b_error = 0;
goto done;
}
done:
mbp->b_resid -= bp->b_bcount - bp->b_resid;
mbp->b_running--;
if ((mbp->b_flags & B_WANTED) != 0) {
mbp->b_flags &= ~B_WANTED;
@ -204,7 +201,6 @@ physio_biodone(struct buf *bp)
size_t todo = bp->b_bufsize;
KASSERT(mbp->b_running > 0);
KASSERT(todo <= mbp->b_resid);
KASSERT(bp->b_bcount <= todo);
KASSERT(bp->b_resid <= bp->b_bcount);
#endif /* defined(DIAGNOSTIC) */
@ -294,8 +290,8 @@ physio(void (*strategy)(struct buf *), struct buf *obp, dev_t dev, int flags,
}
mbp = getphysbuf();
mbp->b_resid = uio->uio_resid;
mbp->b_running = 0;
mbp->b_endoffset = -1;
PHOLD(l);
@ -398,15 +394,12 @@ done_locked:
error = error2;
}
simple_unlock(&mbp->b_interlock);
KASSERT((mbp->b_flags & B_ERROR) != 0 ||
mbp->b_resid == uio->uio_resid);
#if defined(DIAGNOSTIC)
if ((mbp->b_flags & B_ERROR) != 0 && mbp->b_error == 0 &&
uio->uio_offset - mbp->b_resid != mbp->b_eomoffset) {
panic("%s: eom", __func__);
if ((mbp->b_flags & B_ERROR) != 0) {
uio->uio_resid = uio->uio_offset - mbp->b_endoffset;
} else {
KASSERT(mbp->b_endoffset == -1);
}
#endif /* defined(DIAGNOSTIC) */
uio->uio_resid = mbp->b_resid;
if (bp != NULL) {
putphysbuf(bp);
}