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Fix a panic when doing non-multiples of PAGE_SIZE or misaligned transfers

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to a swap backed vn device.

OK'ed by:	dillon
This commit is contained in:
Peter Wemm 1999-12-28 07:32:34 +00:00
parent ea3aecf5b4
commit 358746d7a8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=55176
1 changed files with 13 additions and 1 deletions
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14
sys/dev/vn/vn.c
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@ -311,6 +311,18 @@ vnstrategy(struct buf *bp)
int pbn; /* in sc_secsize chunks */
long sz; /* in sc_secsize chunks */
/*
* Check for required alignment. Transfers must be a valid
* multiple of the sector size.
*/
if (bp->b_bcount % vn->sc_secsize != 0 ||
bp->b_blkno % (vn->sc_secsize / DEV_BSIZE) != 0) {
bp->b_error = EINVAL;
bp->b_flags |= B_ERROR | B_INVAL;
biodone(bp);
return;
}
pbn = bp->b_blkno / (vn->sc_secsize / DEV_BSIZE);
sz = howmany(bp->b_bcount, vn->sc_secsize);
@ -390,7 +402,7 @@ vnstrategy(struct buf *bp)
* Note: if we pre-reserved swap, B_FREEBUF is disabled
*/
KASSERT((bp->b_bufsize & (vn->sc_secsize - 1)) == 0,
("vnstrategy: buffer %p to small for physio", bp));
("vnstrategy: buffer %p too small for physio", bp));
if ((bp->b_flags & B_FREEBUF) && TESTOPT(vn, VN_RESERVE)) {
biodone(bp);