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Code Issues Releases Activity

Don't mark pages as valid if reading the contents from disk fails.

Browse Source 
Instead, just skip marking pages valid if the read fails.  Future
attempts to access such pages will notice that they are not marked valid
and try to read them from disk again.

Reviewed by:	kib, markj
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D25138
This commit is contained in:
Chuck Silvers 2020-06-06 00:47:59 +00:00
parent 7674d489fc
commit bd7d64f548
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=361855
1 changed files with 24 additions and 22 deletions
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46
sys/vm/vnode_pager.c
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@ -1150,28 +1150,30 @@ vnode_pager_generic_getpages_done(struct buf *bp)
if (mt == bogus_page)
continue;
if (nextoff <= object->un_pager.vnp.vnp_size) {
/*
* Read filled up entire page.
*/
vm_page_valid(mt);
KASSERT(mt->dirty == 0,
("%s: page %p is dirty", __func__, mt));
KASSERT(!pmap_page_is_mapped(mt),
("%s: page %p is mapped", __func__, mt));
} else {
/*
* Read did not fill up entire page.
*
* Currently we do not set the entire page valid,
* we just try to clear the piece that we couldn't
* read.
*/
vm_page_set_valid_range(mt, 0,
object->un_pager.vnp.vnp_size - tfoff);
KASSERT((mt->dirty & vm_page_bits(0,
object->un_pager.vnp.vnp_size - tfoff)) == 0,
("%s: page %p is dirty", __func__, mt));
if (error == 0) {
if (nextoff <= object->un_pager.vnp.vnp_size) {
/*
* Read filled up entire page.
*/
vm_page_valid(mt);
KASSERT(mt->dirty == 0,
("%s: page %p is dirty", __func__, mt));
KASSERT(!pmap_page_is_mapped(mt),
("%s: page %p is mapped", __func__, mt));
} else {
/*
* Read did not fill up entire page.
*
* Currently we do not set the entire page
* valid, we just try to clear the piece that
* we couldn't read.
*/
vm_page_set_valid_range(mt, 0,
object->un_pager.vnp.vnp_size - tfoff);
KASSERT((mt->dirty & vm_page_bits(0,
object->un_pager.vnp.vnp_size - tfoff)) ==
0, ("%s: page %p is dirty", __func__, mt));
}
}
if (i < bp->b_pgbefore || i >= bp->b_npages - bp->b_pgafter)