do_generic_file_read: clear page errors when issuing a fresh read of the page

[safe/jmp/linux-2.6] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index 140ebda..35e12d1 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -441,7 +441,7 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
        /*
         * Splice_read and readahead add shmem/tmpfs pages into the page cache
         * before shmem_readpage has a chance to mark them as SwapBacked: they
-        * need to go on the active_anon lru below, and mem_cgroup_cache_charge
+        * need to go on the anon lru below, and mem_cgroup_cache_charge
         * (called in add_to_page_cache) needs to know where they're going too.
         */
        if (mapping_cap_swap_backed(mapping))
@@ -452,7 +452,7 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
                if (page_is_file_cache(page))
                        lru_cache_add_file(page);
                else
-                       lru_cache_add_active_anon(page);
+                       lru_cache_add_anon(page);
        }
        return ret;
 }
@@ -461,9 +461,15 @@ EXPORT_SYMBOL_GPL(add_to_page_cache_lru);
 #ifdef CONFIG_NUMA
 struct page *__page_cache_alloc(gfp_t gfp)
 {
+       int n;
+       struct page *page;
+
        if (cpuset_do_page_mem_spread()) {
-               int n = cpuset_mem_spread_node();
-               return alloc_pages_exact_node(n, gfp, 0);
+               get_mems_allowed();
+               n = cpuset_mem_spread_node();
+               page = alloc_pages_exact_node(n, gfp, 0);
+               put_mems_allowed();
+               return page;
        }
        return alloc_pages(gfp, 0);
 }
@@ -1099,6 +1105,12 @@ page_not_up_to_date_locked:
                }
 
 readpage:
+               /*
+                * A previous I/O error may have been due to temporary
+                * failures, eg. multipath errors.
+                * PG_error will be set again if readpage fails.
+                */
+               ClearPageError(page);
                /* Start the actual read. The read will unlock the page. */
                error = mapping->a_ops->readpage(filp, page);