openvswitch: Validation of IPv6 set port action uses IPv4 header

[~andy/linux] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index 2f8165075a5a9ac67358f2b51dac2bf2cf14f6c0..79c4b2b0b14eec1d05c93e3493dd02e0fd182829 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -101,9 +101,8 @@
  *    ->inode->i_lock          (zap_pte_range->set_page_dirty)
  *    ->private_lock           (zap_pte_range->__set_page_dirty_buffers)
  *
- *  (code doesn't rely on that order, so you could switch it around)
- *  ->tasklist_lock             (memory_failure, collect_procs_ao)
- *    ->i_mmap_mutex
+ * ->i_mmap_mutex
+ *   ->tasklist_lock            (memory_failure, collect_procs_ao)
  */
 
 /*
@@ -123,7 +122,7 @@ void __delete_from_page_cache(struct page *page)
        if (PageUptodate(page) && PageMappedToDisk(page))
                cleancache_put_page(page);
        else
-               cleancache_flush_page(mapping, page);
+               cleancache_invalidate_page(mapping, page);
 
        radix_tree_delete(&mapping->page_tree, page->index);
        page->mapping = NULL;
@@ -500,10 +499,13 @@ struct page *__page_cache_alloc(gfp_t gfp)
        struct page *page;
 
        if (cpuset_do_page_mem_spread()) {
-               get_mems_allowed();
-               n = cpuset_mem_spread_node();
-               page = alloc_pages_exact_node(n, gfp, 0);
-               put_mems_allowed();
+               unsigned int cpuset_mems_cookie;
+               do {
+                       cpuset_mems_cookie = get_mems_allowed();
+                       n = cpuset_mem_spread_node();
+                       page = alloc_pages_exact_node(n, gfp, 0);
+               } while (!put_mems_allowed(cpuset_mems_cookie) && !page);
+
                return page;
        }
        return alloc_pages(gfp, 0);
@@ -811,20 +813,19 @@ EXPORT_SYMBOL(find_or_create_page);
 unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
                            unsigned int nr_pages, struct page **pages)
 {
-       unsigned int i;
-       unsigned int ret;
-       unsigned int nr_found, nr_skip;
+       struct radix_tree_iter iter;
+       void **slot;
+       unsigned ret = 0;
+
+       if (unlikely(!nr_pages))
+               return 0;
 
        rcu_read_lock();
 restart:
-       nr_found = radix_tree_gang_lookup_slot(&mapping->page_tree,
-                               (void ***)pages, NULL, start, nr_pages);
-       ret = 0;
-       nr_skip = 0;
-       for (i = 0; i < nr_found; i++) {
+       radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) {
                struct page *page;
 repeat:
-               page = radix_tree_deref_slot((void **)pages[i]);
+               page = radix_tree_deref_slot(slot);
                if (unlikely(!page))
                        continue;
 
@@ -835,7 +836,7 @@ repeat:
                                 * when entry at index 0 moves out of or back
                                 * to root: none yet gotten, safe to restart.
                                 */
-                               WARN_ON(start | i);
+                               WARN_ON(iter.index);
                                goto restart;
                        }
                        /*
@@ -843,7 +844,6 @@ repeat:
                         * here as an exceptional entry: so skip over it -
                         * we only reach this from invalidate_mapping_pages().
                         */
-                       nr_skip++;
                        continue;
                }
 
@@ -851,21 +851,16 @@ repeat:
                        goto repeat;
 
                /* Has the page moved? */
-               if (unlikely(page != *((void **)pages[i]))) {
+               if (unlikely(page != *slot)) {
                        page_cache_release(page);
                        goto repeat;
                }
 
                pages[ret] = page;
-               ret++;
+               if (++ret == nr_pages)
+                       break;
        }
 
-       /*
-        * If all entries were removed before we could secure them,
-        * try again, because callers stop trying once 0 is returned.
-        */
-       if (unlikely(!ret && nr_found > nr_skip))
-               goto restart;
        rcu_read_unlock();
        return ret;
 }
@@ -885,21 +880,22 @@ repeat:
 unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t index,
                               unsigned int nr_pages, struct page **pages)
 {
-       unsigned int i;
-       unsigned int ret;
-       unsigned int nr_found;
+       struct radix_tree_iter iter;
+       void **slot;
+       unsigned int ret = 0;
+
+       if (unlikely(!nr_pages))
+               return 0;
 
        rcu_read_lock();
 restart:
-       nr_found = radix_tree_gang_lookup_slot(&mapping->page_tree,
-                               (void ***)pages, NULL, index, nr_pages);
-       ret = 0;
-       for (i = 0; i < nr_found; i++) {
+       radix_tree_for_each_contig(slot, &mapping->page_tree, &iter, index) {
                struct page *page;
 repeat:
-               page = radix_tree_deref_slot((void **)pages[i]);
+               page = radix_tree_deref_slot(slot);
+               /* The hole, there no reason to continue */
                if (unlikely(!page))
-                       continue;
+                       break;
 
                if (radix_tree_exception(page)) {
                        if (radix_tree_deref_retry(page)) {
@@ -922,7 +918,7 @@ repeat:
                        goto repeat;
 
                /* Has the page moved? */
-               if (unlikely(page != *((void **)pages[i]))) {
+               if (unlikely(page != *slot)) {
                        page_cache_release(page);
                        goto repeat;
                }
@@ -932,14 +928,14 @@ repeat:
                 * otherwise we can get both false positives and false
                 * negatives, which is just confusing to the caller.
                 */
-               if (page->mapping == NULL || page->index != index) {
+               if (page->mapping == NULL || page->index != iter.index) {
                        page_cache_release(page);
                        break;
                }
 
                pages[ret] = page;
-               ret++;
-               index++;
+               if (++ret == nr_pages)
+                       break;
        }
        rcu_read_unlock();
        return ret;
@@ -960,19 +956,20 @@ EXPORT_SYMBOL(find_get_pages_contig);
 unsigned find_get_pages_tag(struct address_space *mapping, pgoff_t *index,
                        int tag, unsigned int nr_pages, struct page **pages)
 {
-       unsigned int i;
-       unsigned int ret;
-       unsigned int nr_found;
+       struct radix_tree_iter iter;
+       void **slot;
+       unsigned ret = 0;
+
+       if (unlikely(!nr_pages))
+               return 0;
 
        rcu_read_lock();
 restart:
-       nr_found = radix_tree_gang_lookup_tag_slot(&mapping->page_tree,
-                               (void ***)pages, *index, nr_pages, tag);
-       ret = 0;
-       for (i = 0; i < nr_found; i++) {
+       radix_tree_for_each_tagged(slot, &mapping->page_tree,
+                                  &iter, *index, tag) {
                struct page *page;
 repeat:
-               page = radix_tree_deref_slot((void **)pages[i]);
+               page = radix_tree_deref_slot(slot);
                if (unlikely(!page))
                        continue;
 
@@ -996,21 +993,16 @@ repeat:
                        goto repeat;
 
                /* Has the page moved? */
-               if (unlikely(page != *((void **)pages[i]))) {
+               if (unlikely(page != *slot)) {
                        page_cache_release(page);
                        goto repeat;
                }
 
                pages[ret] = page;
-               ret++;
+               if (++ret == nr_pages)
+                       break;
        }
 
-       /*
-        * If all entries were removed before we could secure them,
-        * try again, because callers stop trying once 0 is returned.
-        */
-       if (unlikely(!ret && nr_found))
-               goto restart;
        rcu_read_unlock();
 
        if (ret)
@@ -2341,7 +2333,9 @@ struct page *grab_cache_page_write_begin(struct address_space *mapping,
        struct page *page;
        gfp_t gfp_notmask = 0;
 
-       gfp_mask = mapping_gfp_mask(mapping) | __GFP_WRITE;
+       gfp_mask = mapping_gfp_mask(mapping);
+       if (mapping_cap_account_dirty(mapping))
+               gfp_mask |= __GFP_WRITE;
        if (flags & AOP_FLAG_NOFS)
                gfp_notmask = __GFP_FS;
 repeat: