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It's always a fixed value based on the block size so\nwe can just check that it's the expected value.\n\nTested with:\n\n    mkfs.gfs2 -O -p lock_nolock /dev/vdb\n    for i in 0 -1 64 65 32 33; do\n        gfs2_edit -p sb field sb_bsize_shift $i /dev/vdb\n        mount /dev/vdb /mnt/test && umount /mnt/test\n    done\n\nBefore this patch we get a withdraw after\n\n[   76.413681] gfs2: fsid=loop0.0: fatal: invalid metadata block\n[   76.413681]   bh = 19 (type: exp=5, found=4)\n[   76.413681]   function = gfs2_meta_buffer, file = fs/gfs2/meta_io.c, line = 492\n\nand with UBSAN configured we also get complaints like\n\n[   76.373395] UBSAN: shift-out-of-bounds in fs/gfs2/ops_fstype.c:295:19\n[   76.373815] shift exponent 4294967287 is too large for 64-bit type 'long unsigned int'\n\nAfter the patch, these complaints don't appear, mount fails immediately\nand we get an explanation in 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