btrfs: cleanup duplicated parameters related to btrfs_alloc_ordered_extent

All parameters after @filepos of btrfs_alloc_ordered_extent() can be
replaced with btrfs_file_extent structure.

This patch does the cleanup, meanwhile some points to note:

- Move btrfs_file_extent structure to ordered-data.h
  The structure is needed by both btrfs_alloc_ordered_extent() and
  can_nocow_extent(), but since btrfs_inode.h includes
  ordered-data.h, so we need to move the structure to ordered-data.h.

- Move the special handling of NOCOW/PREALLOC into
  btrfs_alloc_ordered_extent()
  This is to allow btrfs_split_ordered_extent() to properly split them
  for DIO.
  For now just move the handling into btrfs_alloc_ordered_extent() to
  simplify the callers.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 14 insertions, 3 deletions

diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
index 2ec329e2f0f3..580982be1b6e 100644
--- a/fs/btrfs/ordered-data.h
+++ b/fs/btrfs/ordered-data.h
@@ -171,11 +171,22 @@ void btrfs_mark_ordered_io_finished(struct btrfs_inode *inode,
 bool btrfs_dec_test_ordered_pending(struct btrfs_inode *inode,
 				    struct btrfs_ordered_extent **cached,
 				    u64 file_offset, u64 io_size);
+
+/*
+ * This represents details about the target file extent item of a write operation.
+ */
+struct btrfs_file_extent {
+	u64 disk_bytenr;
+	u64 disk_num_bytes;
+	u64 num_bytes;
+	u64 ram_bytes;
+	u64 offset;
+	u8 compression;
+};
+
 struct btrfs_ordered_extent *btrfs_alloc_ordered_extent(
 			struct btrfs_inode *inode, u64 file_offset,
-			u64 num_bytes, u64 ram_bytes, u64 disk_bytenr,
-			u64 disk_num_bytes, u64 offset, unsigned long flags,
-			int compress_type);
+			struct btrfs_file_extent *file_extent, unsigned long flags);
 void btrfs_add_ordered_sum(struct btrfs_ordered_extent *entry,
 			   struct btrfs_ordered_sum *sum);
 struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct btrfs_inode *inode,