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Correct the page count when excess length is trimmed from the bio.

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Reported and tested by:	Ivan Klymenko <fidaj@ukr.net
This commit is contained in:
Konstantin Belousov 2013-03-21 22:36:43 +00:00
parent 46f10cc265
commit e808788c05
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=248596
1 changed files with 9 additions and 0 deletions
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9
sys/geom/geom_io.c
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@ -718,8 +718,17 @@ g_io_schedule_down(struct thread *tp __unused)
*/
excess = bp->bio_offset + bp->bio_length;
if (excess > bp->bio_to->mediasize) {
KASSERT((bp->bio_flags & BIO_UNMAPPED) == 0 ||
round_page(bp->bio_ma_offset +
bp->bio_length) / PAGE_SIZE == bp->bio_ma_n,
("excess bio %p too short", bp));
excess -= bp->bio_to->mediasize;
bp->bio_length -= excess;
if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
bp->bio_ma_n = round_page(
bp->bio_ma_offset +
bp->bio_length) / PAGE_SIZE;
}
if (excess > 0)
CTR3(KTR_GEOM, "g_down truncated bio "
"%p provider %s by %d", bp,