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-rw-r--r--mm/memory-failure.c49
1 files changed, 24 insertions, 25 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 729d4b1..e17ec3f1 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -370,9 +370,6 @@ static int me_pagecache_clean(struct page *p, unsigned long pfn)
int ret = FAILED;
struct address_space *mapping;
- if (!isolate_lru_page(p))
- page_cache_release(p);
-
/*
* For anonymous pages we're done the only reference left
* should be the one m_f() holds.
@@ -498,30 +495,18 @@ static int me_pagecache_dirty(struct page *p, unsigned long pfn)
*/
static int me_swapcache_dirty(struct page *p, unsigned long pfn)
{
- int ret = FAILED;
-
ClearPageDirty(p);
/* Trigger EIO in shmem: */
ClearPageUptodate(p);
- if (!isolate_lru_page(p)) {
- page_cache_release(p);
- ret = DELAYED;
- }
-
- return ret;
+ return DELAYED;
}
static int me_swapcache_clean(struct page *p, unsigned long pfn)
{
- int ret = FAILED;
-
- if (!isolate_lru_page(p)) {
- page_cache_release(p);
- ret = RECOVERED;
- }
delete_from_swap_cache(p);
- return ret;
+
+ return RECOVERED;
}
/*
@@ -611,8 +596,6 @@ static struct page_state {
{ 0, 0, "unknown page state", me_unknown },
};
-#undef lru
-
static void action_result(unsigned long pfn, char *msg, int result)
{
struct page *page = NULL;
@@ -664,9 +647,6 @@ static void hwpoison_user_mappings(struct page *p, unsigned long pfn,
if (PageReserved(p) || PageCompound(p) || PageSlab(p))
return;
- if (!PageLRU(p))
- lru_add_drain_all();
-
/*
* This check implies we don't kill processes if their pages
* are in the swap cache early. Those are always late kills.
@@ -738,6 +718,7 @@ static void hwpoison_user_mappings(struct page *p, unsigned long pfn,
int __memory_failure(unsigned long pfn, int trapno, int ref)
{
+ unsigned long lru_flag;
struct page_state *ps;
struct page *p;
int res;
@@ -775,6 +756,24 @@ int __memory_failure(unsigned long pfn, int trapno, int ref)
}
/*
+ * We ignore non-LRU pages for good reasons.
+ * - PG_locked is only well defined for LRU pages and a few others
+ * - to avoid races with __set_page_locked()
+ * - to avoid races with __SetPageSlab*() (and more non-atomic ops)
+ * The check (unnecessarily) ignores LRU pages being isolated and
+ * walked by the page reclaim code, however that's not a big loss.
+ */
+ if (!PageLRU(p))
+ lru_add_drain_all();
+ lru_flag = p->flags & lru;
+ if (isolate_lru_page(p)) {
+ action_result(pfn, "non LRU", IGNORED);
+ put_page(p);
+ return -EBUSY;
+ }
+ page_cache_release(p);
+
+ /*
* Lock the page and wait for writeback to finish.
* It's very difficult to mess with pages currently under IO
* and in many cases impossible, so we just avoid it here.
@@ -790,7 +789,7 @@ int __memory_failure(unsigned long pfn, int trapno, int ref)
/*
* Torn down by someone else?
*/
- if (PageLRU(p) && !PageSwapCache(p) && p->mapping == NULL) {
+ if ((lru_flag & lru) && !PageSwapCache(p) && p->mapping == NULL) {
action_result(pfn, "already truncated LRU", IGNORED);
res = 0;
goto out;
@@ -798,7 +797,7 @@ int __memory_failure(unsigned long pfn, int trapno, int ref)
res = -EBUSY;
for (ps = error_states;; ps++) {
- if ((p->flags & ps->mask) == ps->res) {
+ if (((p->flags | lru_flag)& ps->mask) == ps->res) {
res = page_action(ps, p, pfn, ref);
break;
}
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