From 1e5eb3d6a443d0271a5bb798e1bc94d549895efe Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Thu, 25 Mar 2021 15:14:41 +0800 Subject: [PATCH] btrfs: make alloc_extent_buffer() check subpage dirty bitmap In alloc_extent_buffer(), we make sure that the newly allocated page is never dirty. This is fine for sector size == PAGE_SIZE case, but for subpage it's possible that one extent buffer in the page is dirty, thus the whole page is marked dirty, and could cause false alert. To support subpage, call btrfs_page_test_dirty() to handle both cases. Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/extent_io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 7ad2169..7c195d8 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -5665,7 +5665,7 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, btrfs_page_inc_eb_refs(fs_info, p); spin_unlock(&mapping->private_lock); - WARN_ON(PageDirty(p)); + WARN_ON(btrfs_page_test_dirty(fs_info, p, eb->start, eb->len)); eb->pages[i] = p; if (!PageUptodate(p)) uptodate = 0; -- 2.7.4