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Index: sys/vm/vm_page.h
===================================================================
--- sys/vm/vm_page.h
+++ sys/vm/vm_page.h
@@ -655,6 +655,7 @@
void vm_page_release_locked(vm_page_t m, int flags);
vm_page_t vm_page_relookup(vm_object_t, vm_pindex_t);
bool vm_page_remove(vm_page_t);
+void vm_page_remove_invalid(vm_page_t);
bool vm_page_remove_xbusy(vm_page_t);
int vm_page_rename(vm_page_t, vm_object_t, vm_pindex_t);
void vm_page_replace(vm_page_t mnew, vm_object_t object,
Index: sys/vm/vm_page.c
===================================================================
--- sys/vm/vm_page.c
+++ sys/vm/vm_page.c
@@ -1362,6 +1362,30 @@
}
/*
+ * Destroy the identity of invalid pages and free them if possible.
+ * This is intended to be used when reading pages from backing store fails.
+ */
+void
+vm_page_remove_invalid(vm_page_t m)
+{
+
+ KASSERT(vm_page_none_valid(m), ("page %p is valid", m));
+ KASSERT(!pmap_page_is_mapped(m), ("page %p is mapped", m));
+ vm_page_assert_xbusied(m);
+ VM_OBJECT_ASSERT_WLOCKED(m->object);
+
+ /*
+ * If someone has wired this page while the object lock
+ * was not held, then the thread that unwires is responsible
+ * for freeing the page. Otherwise just free the page now.
+ * The wire count of this unmapped page cannot change while
+ * we have the page xbusy and the page's object wlocked.
+ */
+ if (vm_page_remove(m))
+ vm_page_free(m);
+}
+
+/*
* vm_page_sleep_if_busy:
*
* Sleep and release the object lock if the page is busied.
Index: sys/vm/vnode_pager.c
===================================================================
--- sys/vm/vnode_pager.c
+++ sys/vm/vnode_pager.c
@@ -1139,6 +1139,21 @@
bp->b_data = unmapped_buf;
}
+ /*
+ * If the read failed, we must free any read ahead/behind pages here.
+ * The requested pages are freed by the caller (for sync requests)
+ * or by the bp->b_pgiodone callback (for async requests).
+ */
+ if (error != 0) {
+ VM_OBJECT_WLOCK(object);
+ for (i = 0; i < bp->b_pgbefore; i++)
+ vm_page_remove_invalid(bp->b_pages[i]);
+ for (i = bp->b_npages - bp->b_pgafter; i < bp->b_npages; i++)
+ vm_page_remove_invalid(bp->b_pages[i]);
+ VM_OBJECT_WUNLOCK(object);
+ return (error);
+ }
+
/* Read lock to protect size. */
VM_OBJECT_RLOCK(object);
for (i = 0, tfoff = IDX_TO_OFF(bp->b_pages[0]->pindex);
@@ -1150,30 +1165,28 @@
if (mt == bogus_page)
continue;
- 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 (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)

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