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Update the out-of-date comment with more correct one.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 <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index e65223e..d81ae1f 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,