Btrfs: fix regression in lock_delalloc_pages
The bug is a regression after commit (da2c7009 "btrfs: teach __process_pages_contig about PAGE_LOCK operation") and commit (76c0021d "Btrfs: use helper to simplify lock/unlock pages"). So if the dirty pages which are under writeback got truncated partially before we lock the dirty pages, we couldn't find all pages mapping to the delalloc range, and the bug didn't return an error so it kept going on and found that the delalloc range got truncated and got to unlock the dirty pages, and then the ASSERT could caught the error, and showed ----------------------------------------------------------------------------- assertion failed: page_ops & PAGE_LOCK, file: fs/btrfs/extent_io.c, line: 1716 ----------------------------------------------------------------------------- This fixes the bug by returning the proper -EAGAIN. Cc: David Sterba <dsterba@suse.com> Reported-by: NDave Jones <davej@codemonkey.org.uk> Signed-off-by: NLiu Bo <bo.li.liu@oracle.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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