Btrfs: do aio_write instead of write

In order for AIO to work, we need to implement aio_write.  This patch converts
our btrfs_file_write to btrfs_aio_write.  I've tested this with xfstests and
nothing broke, and the AIO stuff magically started working.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 1a57c17d4029..a53aca338c7f 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2017,6 +2017,7 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
         sector_t sector;
         struct extent_map *em;
         struct block_device *bdev;
+        struct btrfs_ordered_extent *ordered;
         int ret;
         int nr = 0;
         size_t page_offset = 0;
@@ -2028,7 +2029,15 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
         set_page_extent_mapped(page);
 
         end = page_end;
-        lock_extent(tree, start, end, GFP_NOFS);
+        while (1) {
+                lock_extent(tree, start, end, GFP_NOFS);
+                ordered = btrfs_lookup_ordered_extent(inode, start);
+                if (!ordered)
+                        break;
+                unlock_extent(tree, start, end, GFP_NOFS);
+                btrfs_start_ordered_extent(inode, ordered, 1);
+                btrfs_put_ordered_extent(ordered);
+        }
 
         if (page->index == last_byte >> PAGE_CACHE_SHIFT) {
                 char *userpage;