ext4: inline walk_page_buffers() into mpage_da_submit_io

Expand the call:

  if (walk_page_buffers(NULL, page_bufs, 0, len, NULL,
                        ext4_bh_delay_or_unwritten))
	goto redirty_page

into mpage_da_submit_io().

This will allow us to merge in mpage_put_bnr_to_bhs() in the next
patch.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 97a0c35219ae4bf2a61a5fe6bf38621b38681184..5da6cfcecd835459302daf734afac69f5aa0f7c5 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2011,8 +2011,8 @@ static int mpage_da_submit_io(struct mpage_da_data *mpd)
        struct inode *inode = mpd->inode;
        struct address_space *mapping = inode->i_mapping;
        loff_t size = i_size_read(inode);
-       unsigned int len;
-       struct buffer_head *page_bufs = NULL;
+       unsigned int len, block_start;
+       struct buffer_head *bh, *page_bufs = NULL;
        int journal_data = ext4_should_journal_data(inode);
 
        BUG_ON(mpd->next_page <= mpd->first_page);
@@ -2064,15 +2064,17 @@ static int mpage_da_submit_io(struct mpage_da_data *mpd)
                                }
                                commit_write = 1;
                        }
-                       page_bufs = page_buffers(page);
-                       if (walk_page_buffers(NULL, page_bufs, 0, len, NULL,
-                                             ext4_bh_delay_or_unwritten)) {
-                               /*
-                                * We couldn't do block allocation for
-                                * some reason.
-                                */
-                               goto redirty_page;
-                       }
+
+                       bh = page_bufs = page_buffers(page);
+                       block_start = 0;
+                       do {
+                               /* redirty page if block allocation undone */
+                               if (!bh || buffer_delay(bh) ||
+                                   buffer_unwritten(bh))
+                                       goto redirty_page;
+                               bh = bh->b_this_page;
+                               block_start += bh->b_size;
+                       } while ((bh != page_bufs) && (block_start < len));
 
                        if (commit_write)
                                /* mark the buffer_heads as dirty & uptodate */