ext4: don't let i_reserved_meta_blocks go negative

[firefly-linux-kernel-4.4.55.git] / fs / mpage.c

diff --git a/fs/mpage.c b/fs/mpage.c
index 0afc809e46e09b53cb767e56795fba3139c4b181..fdfae9fa98cda52f26b730ab6786db084124d279 100644 (file)
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -27,6 +27,7 @@
 #include <linux/writeback.h>
 #include <linux/backing-dev.h>
 #include <linux/pagevec.h>
+#include <linux/cleancache.h>
 
 /*
  * I/O completion handler for multipage BIOs.
@@ -271,6 +272,12 @@ do_mpage_readpage(struct bio *bio, struct page *page, unsigned nr_pages,
                SetPageMappedToDisk(page);
        }
 
+       if (fully_mapped && blocks_per_page == 1 && !PageUptodate(page) &&
+           cleancache_get_page(page) == 0) {
+               SetPageUptodate(page);
+               goto confused;
+       }
+
        /*
         * This page will go to BIO.  Do we need to send this BIO off first?
         */