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Fix the data corruption on the swap-backed md.

Browse source 
Assign the rv variable a success code if the pager was not asked for
the page.  Using an error code from the previous processed page caused
zeroing of the valid page, when e.g. the previous page was not
available in the pager.

Reported by:	lstewart
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2013-05-24 09:48:42 +00:00
parent dce93cd06d
commit 537cc627d7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=250966
1 changed files with 7 additions and 1 deletions
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8
sys/dev/md/md.c
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@ -829,7 +829,9 @@ mdstart_swap(struct md_s *sc, struct bio *bp)
m = vm_page_grab(sc->object, i, VM_ALLOC_NORMAL |
VM_ALLOC_RETRY);
if (bp->bio_cmd == BIO_READ) {
if (m->valid != VM_PAGE_BITS_ALL)
if (m->valid == VM_PAGE_BITS_ALL)
rv = VM_PAGER_OK;
else
rv = vm_pager_get_pages(sc->object, &m, 1, 0);
if (rv == VM_PAGER_ERROR) {
vm_page_wakeup(m);
@ -854,6 +856,8 @@ mdstart_swap(struct md_s *sc, struct bio *bp)
} else if (bp->bio_cmd == BIO_WRITE) {
if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL)
rv = vm_pager_get_pages(sc->object, &m, 1, 0);
else
rv = VM_PAGER_OK;
if (rv == VM_PAGER_ERROR) {
vm_page_wakeup(m);
break;
@ -868,6 +872,8 @@ mdstart_swap(struct md_s *sc, struct bio *bp)
} else if (bp->bio_cmd == BIO_DELETE) {
if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL)
rv = vm_pager_get_pages(sc->object, &m, 1, 0);
else
rv = VM_PAGER_OK;
if (rv == VM_PAGER_ERROR) {
vm_page_wakeup(m);
break;