CIFS: FS-Cache: Uncache unread pages in cifs_readpages() before freeing them

[deliverable/linux.git] / fs / cifs / file.c

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index eb955b525e55307a18c1b534e95e5bfbe8462764..7ddddf2e25046af5fceb6fcbe097e2b14750710c 100644 (file)
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3254,6 +3254,9 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
        /*
         * Reads as many pages as possible from fscache. Returns -ENOBUFS
         * immediately if the cookie is negative
+        *
+        * After this point, every page in the list might have PG_fscache set,
+        * so we will need to clean that up off of every page we don't use.
         */
        rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
                                         &num_pages);
@@ -3376,6 +3379,11 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
                kref_put(&rdata->refcount, cifs_readdata_release);
        }
 
+       /* Any pages that have been shown to fscache but didn't get added to
+        * the pagecache must be uncached before they get returned to the
+        * allocator.
+        */
+       cifs_fscache_readpages_cancel(mapping->host, page_list);
        return rc;
 }