From c0fab480955c4a943cc77be58269d97128ac3ef9 Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Wed, 6 Jan 2021 09:01:42 +0800 Subject: [PATCH] btrfs: update comment for btrfs_dirty_pages The original comment is from the initial merge, which has several problems: - No holes check any more - No inline decision is made Update the out-of-date comment with more correct one. Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/file.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index e65223e3510d..d81ae1f518f2 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -453,12 +453,11 @@ static void btrfs_drop_pages(struct page **pages, size_t num_pages) } /* - * after copy_from_user, pages need to be dirtied and we need to make - * sure holes are created between the current EOF and the start of - * any next extents (if required). - * - * this also makes the decision about creating an inline extent vs - * doing real data extents, marking pages dirty and delalloc as required. + * After btrfs_copy_from_user(), update the following things for delalloc: + * - Mark newly dirtied pages as DELALLOC in the io tree. + * Used to advise which range is to be written back. + * - Mark modified pages as Uptodate/Dirty and not needing COW fixup + * - Update inode size for past EOF write */ int btrfs_dirty_pages(struct btrfs_inode *inode, struct page **pages, size_t num_pages, loff_t pos, size_t write_bytes, -- 2.34.1