The attached patch causes read_cache_pages() to release page-private data on a
page for which add_to_page_cache() fails or the filler function fails. This
permits pages with caching references associated with them to be cleaned up.
Signed-Off-By: David Howells <dhowells@xxxxxxxxxx>
---
mm/readahead.c | 16 ++++++++++++++++
1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 0f142a4..82deb7f 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -141,6 +141,12 @@ int read_cache_pages(struct address_spac
page = list_to_page(pages);
list_del(&page->lru);
if (add_to_page_cache(page, mapping, page->index, GFP_KERNEL)) {
+ if (PagePrivate(page) && mapping->a_ops->releasepage) {
+ page->mapping = mapping;
+ mapping->a_ops->releasepage(page, GFP_KERNEL);
+ page->mapping = NULL;
+ }
+
page_cache_release(page);
continue;
}
@@ -153,6 +159,16 @@ int read_cache_pages(struct address_spac
victim = list_to_page(pages);
list_del(&victim->lru);
+
+ if (PagePrivate(victim) &&
+ mapping->a_ops->releasepage
+ ) {
+ victim->mapping = mapping;
+ mapping->a_ops->releasepage(
+ victim, GFP_KERNEL);
+ victim->mapping = NULL;
+ }
+
page_cache_release(victim);
}
break;
-
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