pmem: fail io-requests to known bad blocks
Check the sectors specified in a read bio to see if they hit a known bad block, and return an error code pmem_do_bvec(). Note that the ->rw_page() is not in a position to return errors. For now, copy the same layering violation present in zram_rw_page() to avoid crashes of the form: kernel BUG at mm/filemap.c:822! [..] Call Trace: [<ffffffff811c540e>] page_endio+0x1e/0x60 [<ffffffff81290d29>] mpage_end_io+0x39/0x60 [<ffffffff8141c4ef>] bio_endio+0x3f/0x60 [<ffffffffa005c491>] pmem_make_request+0x111/0x230 [nd_pmem] ...i.e. unlock a page that was already unlocked via pmem_rw_page() => page_endio(). Reported-by: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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