gfs2: use ->invalidatepage() length argument

->invalidatepage() aop now accepts range to invalidate so we can make
use of it in gfs2_invalidatepage().

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
Cc: cluster-devel@redhat.com

1 files changed, 7 insertions, 2 deletions

diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index db0d39f9fba4..ee48ad37d9c0 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -948,24 +948,29 @@ static void gfs2_invalidatepage(struct page *page, unsigned int offset,
                                 unsigned int length)
 {
         struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
+        unsigned int stop = offset + length;
+        int partial_page = (offset || length < PAGE_CACHE_SIZE);
         struct buffer_head *bh, *head;
         unsigned long pos = 0;
 
         BUG_ON(!PageLocked(page));
-        if (offset == 0)
+        if (!partial_page)
                 ClearPageChecked(page);
         if (!page_has_buffers(page))
                 goto out;
 
         bh = head = page_buffers(page);
         do {
+                if (pos + bh->b_size > stop)
+                        return;
+
                 if (offset <= pos)
                         gfs2_discard(sdp, bh);
                 pos += bh->b_size;
                 bh = bh->b_this_page;
         } while (bh != head);
 out:
-        if (offset == 0)
+        if (!partial_page)
                 try_to_release_page(page, 0);
 }