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[05/12] btrfs: extent_io: make alloc_extent_buffer() check subpage dirty bitmap

Message ID 20210222063357.92930-6-wqu@suse.com (mailing list archive)
State New, archived
Headers show
Series btrfs: support read-write for subpage metadata | expand

Commit Message

Qu Wenruo Feb. 22, 2021, 6:33 a.m. UTC
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 <wqu@suse.com>
 fs/btrfs/extent_io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 4dfb3ead1175..6637535d264d 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -5625,7 +5625,7 @@  struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
 		btrfs_page_inc_eb_refs(fs_info, p);
-		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;