[PATCH 6/7] btrfs: defrag: make btrfs_defrag_file() to report accurate number of defragged sectors

[Qu Wenruo <wqu@suse.com>]

Previously rework btrfs_defrag_file() can only report the number of
sectors from the first run of defrag_collect_targets().

This number is not accurate as if holes are punched after the first
defrag_collect_targets() call, we will not choose to defrag the holes.

Originally this is to avoid passing @sectors_defragged to every involved
functions.

But now since we have btrfs_defrag_ctrl, there is no need to do such
inaccurate accounting, just update btrfs_defrag_ctrl::sectors_defragged
after a successful defrag_one_locked_target() call.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
---
 fs/btrfs/ioctl.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 72d157b89a17..1f0bf6181013 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1652,6 +1652,8 @@ static int defrag_one_range(struct btrfs_inode *inode,
 					       &cached_state);
 		if (ret < 0)
 			break;
+		ctrl->sectors_defragged += entry->len >>
+					   inode->root->fs_info->sectorsize_bits;
 	}
 
 	list_for_each_entry_safe(entry, tmp, &target_list, list) {
@@ -1716,17 +1718,9 @@ static int defrag_one_cluster(struct btrfs_inode *inode,
 				ra, NULL, entry->start >> PAGE_SHIFT,
 				((entry->start + range_len - 1) >> PAGE_SHIFT) -
 				(entry->start >> PAGE_SHIFT) + 1);
-		/*
-		 * Here we may not defrag any range if holes are punched before
-		 * we locked the pages.
-		 * But that's fine, it only affects the @sectors_defragged
-		 * accounting.
-		 */
 		ret = defrag_one_range(inode, ctrl, entry->start, range_len);
 		if (ret < 0)
 			break;
-		ctrl->sectors_defragged += range_len >>
-					   inode->root->fs_info->sectorsize_bits;
 	}
 out:
 	list_for_each_entry_safe(entry, tmp, &target_list, list) {
-- 
2.35.1