The current LOOP_SET_STATUS64 ioctl has two unused fields 'init[2]', which can be used in conjunction with the LO_FLAGS_BLOCKSIZE flag to pass in the new logical blocksize.
Signed-off-by: Hannes Reinecke <[email protected]> --- drivers/block/loop.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 321f296..3d2ee0f 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -963,11 +963,21 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info) if (err) return err; - if (info->lo_flags & LO_FLAGS_BLOCKSIZE) + if (info->lo_flags & LO_FLAGS_BLOCKSIZE) { lo->lo_flags |= LO_FLAGS_BLOCKSIZE; + if ((info->lo_init[0] != 512) && + (info->lo_init[0] != 1024) && + (info->lo_init[0] != 2048) && + (info->lo_init[0] != 4096)) + return -EINVAL; + if (info->lo_init[0] > lo->lo_blocksize) + return -EINVAL; + lo->lo_logical_blocksize = info->lo_init[0]; + } if (lo->lo_offset != info->lo_offset || - lo->lo_sizelimit != info->lo_sizelimit) + lo->lo_sizelimit != info->lo_sizelimit || + lo->lo_flags & LO_FLAGS_BLOCKSIZE) if (figure_loop_size(lo, info->lo_offset, info->lo_sizelimit)) return -EFBIG; -- 1.8.4.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
