xps: Transmit Packet Steering

[net-next-2.6.git] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index 61ba5e405791918e2bab077144300b1d4d7ab6ce..ea89840fc65fa2b499ce3c19c657e9e8a680b240 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -644,7 +644,9 @@ repeat:
        pagep = radix_tree_lookup_slot(&mapping->page_tree, offset);
        if (pagep) {
                page = radix_tree_deref_slot(pagep);
-               if (unlikely(!page || page == RADIX_TREE_RETRY))
+               if (unlikely(!page))
+                       goto out;
+               if (radix_tree_deref_retry(page))
                        goto repeat;
 
                if (!page_cache_get_speculative(page))
@@ -660,6 +662,7 @@ repeat:
                        goto repeat;
                }
        }
+out:
        rcu_read_unlock();
 
        return page;
@@ -777,12 +780,11 @@ repeat:
                page = radix_tree_deref_slot((void **)pages[i]);
                if (unlikely(!page))
                        continue;
-               /*
-                * this can only trigger if nr_found == 1, making livelock
-                * a non issue.
-                */
-               if (unlikely(page == RADIX_TREE_RETRY))
+               if (radix_tree_deref_retry(page)) {
+                       if (ret)
+                               start = pages[ret-1]->index;
                        goto restart;
+               }
 
                if (!page_cache_get_speculative(page))
                        goto repeat;
@@ -830,11 +832,7 @@ repeat:
                page = radix_tree_deref_slot((void **)pages[i]);
                if (unlikely(!page))
                        continue;
-               /*
-                * this can only trigger if nr_found == 1, making livelock
-                * a non issue.
-                */
-               if (unlikely(page == RADIX_TREE_RETRY))
+               if (radix_tree_deref_retry(page))
                        goto restart;
 
                if (page->mapping == NULL || page->index != index)
@@ -887,11 +885,7 @@ repeat:
                page = radix_tree_deref_slot((void **)pages[i]);
                if (unlikely(!page))
                        continue;
-               /*
-                * this can only trigger if nr_found == 1, making livelock
-                * a non issue.
-                */
-               if (unlikely(page == RADIX_TREE_RETRY))
+               if (radix_tree_deref_retry(page))
                        goto restart;
 
                if (!page_cache_get_speculative(page))
@@ -1029,6 +1023,9 @@ find_page:
                                goto page_not_up_to_date;
                        if (!trylock_page(page))
                                goto page_not_up_to_date;
+                       /* Did it get truncated before we got the lock? */
+                       if (!page->mapping)
+                               goto page_not_up_to_date_locked;
                        if (!mapping->a_ops->is_partially_uptodate(page,
                                                                desc, offset))
                                goto page_not_up_to_date_locked;