• Jeffle Xu's avatar
    dm table: fix iterate_devices based device capability checks · a4c8dd9c
    Jeffle Xu authored
    According to the definition of dm_iterate_devices_fn:
     * This function must iterate through each section of device used by the
     * target until it encounters a non-zero return code, which it then returns.
     * Returns zero if no callout returned non-zero.
    
    For some target type (e.g. dm-stripe), one call of iterate_devices() may
    iterate multiple underlying devices internally, in which case a non-zero
    return code returned by iterate_devices_callout_fn will stop the iteration
    in advance. No iterate_devices_callout_fn should return non-zero unless
    device iteration should stop.
    
    Rename dm_table_requires_stable_pages() to dm_table_any_dev_attr() and
    elevate it for reuse to stop iterating (and return non-zero) on the
    first device that causes iterate_devices_callout_fn to return non-zero.
    Use dm_table_any_dev_attr() to properly iterate through devices.
    
    Rename device_is_nonrot() to device_is_rotational() and invert logic
    accordingly to fix improper disposition.
    
    Fixes: c3c4555e ("dm table: clear add_random unless all devices have it set")
    Fixes: 4693c966
    
     ("dm table: propagate non rotational flag")
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarJeffle Xu <jefflexu@linux.alibaba.com>
    Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    a4c8dd9c
dm-table.c 48 KB