Hi all, Here are a few online fsck fixes for 4.20. The first patch fixes the online repair "find AG btree root" function to ignore btree blocks that have siblings and to ignore a btree level if multiple sibling-less blocks are found. The second patch strengthens the buffer read functions to apply buffer ops (and verify the buffer contents) any time a caller tries to read a buffer with a given set of ops and the buffer doesn't have ops yet. The third patch fixes some buffer state management bugs so that we don't accidentally clobber b_ops on buffers that were already in-core when we try to find an AG header's btree root blocks. Comments and questions are, as always, welcome. --D
