mm: non-atomically mark page accessed during page cache allocation where possible

[cascardo/linux.git] / fs / btrfs / extent_io.c

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index f29a54e..4cd0ac9 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4510,7 +4510,8 @@ static void check_buffer_tree_ref(struct extent_buffer *eb)
        spin_unlock(&eb->refs_lock);
 }
 
-static void mark_extent_buffer_accessed(struct extent_buffer *eb)
+static void mark_extent_buffer_accessed(struct extent_buffer *eb,
+               struct page *accessed)
 {
        unsigned long num_pages, i;
 
@@ -4519,7 +4520,8 @@ static void mark_extent_buffer_accessed(struct extent_buffer *eb)
        num_pages = num_extent_pages(eb->start, eb->len);
        for (i = 0; i < num_pages; i++) {
                struct page *p = extent_buffer_page(eb, i);
-               mark_page_accessed(p);
+               if (p != accessed)
+                       mark_page_accessed(p);
        }
 }
 
@@ -4533,7 +4535,7 @@ struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
                               start >> PAGE_CACHE_SHIFT);
        if (eb && atomic_inc_not_zero(&eb->refs)) {
                rcu_read_unlock();
-               mark_extent_buffer_accessed(eb);
+               mark_extent_buffer_accessed(eb, NULL);
                return eb;
        }
        rcu_read_unlock();
@@ -4581,7 +4583,7 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
                                spin_unlock(&mapping->private_lock);
                                unlock_page(p);
                                page_cache_release(p);
-                               mark_extent_buffer_accessed(exists);
+                               mark_extent_buffer_accessed(exists, p);
                                goto free_eb;
                        }
 
@@ -4596,7 +4598,6 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
                attach_extent_buffer_page(eb, p);
                spin_unlock(&mapping->private_lock);
                WARN_ON(PageDirty(p));
-               mark_page_accessed(p);
                eb->pages[i] = p;
                if (!PageUptodate(p))
                        uptodate = 0;