• Miao Xie's avatar
    Btrfs, raid56: fix use-after-free problem in the final device replace procedure on raid56 · 4245215d
    Miao Xie authored
    The commit c404e0dc (Btrfs: fix use-after-free in the finishing
    procedure of the device replace) fixed a use-after-free problem
    which happened when removing the source device at the end of device
    replace, but at that time, btrfs didn't support device replace
    on raid56, so we didn't fix the problem on the raid56 profile.
    Currently, we implemented device replace for raid56, so we need
    kick that problem out before we enable that function for raid56.
    
    The fix method is very simple, we just increase the bio per-cpu
    counter before we submit a raid56 io, and decrease the counter
    when the raid56 io ends.
    Signed-off-by: default avatarMiao Xie <miaox@cn.fujitsu.com>
    4245215d
volumes.c 171 KB