xfs: remove the all_bh flag from xfs_convert_page

The all_bh flag is always set when entering the page clustering
machinery with a regular written extent, which means the check for
it is superflous.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>

1 files changed, 13 insertions, 20 deletions

diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index c3bc7690f04..86f57f61939 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -682,8 +682,7 @@ xfs_convert_page(
         loff_t                  tindex,
         struct xfs_bmbt_irec    *imap,
         xfs_ioend_t             **ioendp,
-        struct writeback_control *wbc,
-        int                     all_bh)
+        struct writeback_control *wbc)
 {
         struct buffer_head      *bh, *head;
         xfs_off_t               end_offset;
@@ -738,11 +737,14 @@ xfs_convert_page(
                         continue;
                 }
 
-                if (buffer_unwritten(bh) || buffer_delay(bh)) {
+                if (buffer_unwritten(bh) || buffer_delay(bh) ||
+                    buffer_mapped(bh)) {
                         if (buffer_unwritten(bh))
                                 type = IO_UNWRITTEN;
-                        else
+                        else if (buffer_delay(bh))
                                 type = IO_DELALLOC;
+                        else
+                                type = IO_OVERWRITE;
 
                         if (!xfs_imap_valid(inode, imap, offset)) {
                                 done = 1;
@@ -752,23 +754,17 @@ xfs_convert_page(
                         ASSERT(imap->br_startblock != HOLESTARTBLOCK);
                         ASSERT(imap->br_startblock != DELAYSTARTBLOCK);
 
-                        xfs_map_at_offset(inode, bh, imap, offset);
+                        if (type == IO_OVERWRITE)
+                                lock_buffer(bh);
+                        else
+                                xfs_map_at_offset(inode, bh, imap, offset);
                         xfs_add_to_ioend(inode, bh, offset, type,
                                          ioendp, done);
 
                         page_dirty--;
                         count++;
                 } else {
-                        type = IO_OVERWRITE;
-                        if (buffer_mapped(bh) && all_bh) {
-                                lock_buffer(bh);
-                                xfs_add_to_ioend(inode, bh, offset,
-                                                type, ioendp, done);
-                                count++;
-                                page_dirty--;
-                        } else {
-                                done = 1;
-                        }
+                        done = 1;
                 }
         } while (offset += len, (bh = bh->b_this_page) != head);
 
@@ -800,7 +796,6 @@ xfs_cluster_write(
         struct xfs_bmbt_irec    *imap,
         xfs_ioend_t             **ioendp,
         struct writeback_control *wbc,
-        int                     all_bh,
         pgoff_t                 tlast)
 {
         struct pagevec          pvec;
@@ -815,7 +810,7 @@ xfs_cluster_write(
 
                 for (i = 0; i < pagevec_count(&pvec); i++) {
                         done = xfs_convert_page(inode, pvec.pages[i], tindex++,
-                                        imap, ioendp, wbc, all_bh);
+                                        imap, ioendp, wbc);
                         if (done)
                                 break;
                 }
@@ -929,7 +924,6 @@ xfs_vm_writepage(
         ssize_t                 len;
         int                     err, imap_valid = 0, uptodate = 1;
         int                     count = 0;
-        int                     all_bh = 0;
         int                     nonblocking = 0;
 
         trace_xfs_writepage(inode, page, 0);
@@ -1065,7 +1059,6 @@ xfs_vm_writepage(
                         }
 
                         if (imap_valid) {
-                                all_bh = 1;
                                 lock_buffer(bh);
                                 xfs_add_to_ioend(inode, bh, offset, type,
                                                 &ioend, new_ioend);
@@ -1102,7 +1095,7 @@ xfs_vm_writepage(
                         end_index = last_index;
 
                 xfs_cluster_write(inode, page->index + 1, &imap, &ioend,
-                                        wbc, all_bh, end_index);
+                                  wbc, end_index);
         }
 
         if (iohead)