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>

1 files changed, 13 insertions, 11 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 97a0c35219ae..5da6cfcecd83 100644
--- 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 */