btrfs: Remove extent_io_ops::fill_delalloc

This callback is called only from writepage_delalloc which in turn is
guaranteed to be called from the data page writeout path. In the end
there is no reason to have the call to this function to be indrected via
the extent_io_ops structure. This patch removes the callback definition,
exports the function and calls it directly. No functional changes.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ rename to btrfs_run_delalloc_range ]
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 7 insertions, 8 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 9ea4c6f0352f..afc8704e9c78 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -109,8 +109,8 @@ static void __endio_write_update_ordered(struct inode *inode,
  * extent_clear_unlock_delalloc() to clear both the bits EXTENT_DO_ACCOUNTING
  * and EXTENT_DELALLOC simultaneously, because that causes the reserved metadata
  * to be released, which we want to happen only when finishing the ordered
- * extent (btrfs_finish_ordered_io()). Also note that the caller of the
- * fill_delalloc() callback already does proper cleanup for the first page of
+ * extent (btrfs_finish_ordered_io()). Also note that the caller of
+ * btrfs_run_delalloc_range already does proper cleanup for the first page of
  * the range, that is, it invokes the callback writepage_end_io_hook() for the
  * range of the first page.
  */
@@ -1576,12 +1576,12 @@ static inline int need_force_cow(struct inode *inode, u64 start, u64 end)
 }
 
 /*
- * extent_io.c call back to do delayed allocation processing
+ * Function to process delayed allocation (create CoW) for ranges which are
+ * being touched for the first time.
  */
-static int run_delalloc_range(void *private_data, struct page *locked_page,
-			      u64 start, u64 end, int *page_started,
-			      unsigned long *nr_written,
-			      struct writeback_control *wbc)
+int btrfs_run_delalloc_range(void *private_data, struct page *locked_page,
+		u64 start, u64 end, int *page_started, unsigned long *nr_written,
+		struct writeback_control *wbc)
 {
 	struct inode *inode = private_data;
 	int ret;
@@ -10526,7 +10526,6 @@ static const struct extent_io_ops btrfs_extent_io_ops = {
 	.readpage_io_failed_hook = btrfs_readpage_io_failed_hook,
 
 	/* optional callbacks */
-	.fill_delalloc = run_delalloc_range,
 	.writepage_end_io_hook = btrfs_writepage_end_io_hook,
 	.writepage_start_hook = btrfs_writepage_start_hook,
 	.set_bit_hook = btrfs_set_bit_hook,