• J
    dm thin: fix stacked bi_next usage · 6f94a4c4
    Joe Thornber 提交于
    Avoid using the bi_next field for the holder of a cell when deferring
    bios because a stacked device below might change it.  Store the
    holder in a new field in struct cell instead.
    
    When a cell is created, the bio that triggered creation (the holder) was
    added to the same bio list as subsequent bios.  In some cases we pass
    this holder bio directly to devices underneath.  If those devices use
    the bi_next field there will be trouble...
    
    This also simplifies some code that had to work out which bio was the
    holder.
    Signed-off-by: NJoe Thornber <ejt@redhat.com>
    Cc: stable@kernel.org
    Signed-off-by: NMike Snitzer <snitzer@redhat.com>
    Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
    6f94a4c4
dm-thin.c 56.8 KB