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a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=GoEa3M9JfhUA:10 a=vILngSUHaWQOPQsE9VUA:9 a=QEXdDO2ut3YA:10 cc=ntf awl=host:12058 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzAzMDEzMiBTYWx0ZWRfXz64wlXvVmDRn CdqutEB8uiPkg+IS0laLMWhQuOy0rg1waJZfuNRetmjj9j2eUSr7/S+vTiH2bjL4ndUcj7t/Ei5 LgsCbfmWfY91y4jhz1JoaqtaJYMI/1vV2NctJS1vZfFTrW8aiLkmeCYmbfMtQQV2Z67IWS63GGR KKyoHfQeWz7eqoxXtecd3u1Ciio4KXolW7J2KWuDJAn7cx3iZFmkOx8xawBtDgdYBFVIQmCiCpS DjLCt+0SL+CQV5tAVQKQg+vVO6Wu+KxbXV3faWozdLMI4TQawvf6lt4Dtc1Nf4cQmkrZD3RoqQt ugTAaIIXSL1giPD82c/6faO0FoPeN3TkQR0paWyYuV/3cL2JJ5qODYTgzkNHeOnqEXccATFjacy FPfA+r4QCNeyMeQoxDpsbgWjZwgea0N5xyNCX9zuc1h1V7t9gIMZcIAcMhPURpPI8psA5bGs On 03/07/2025 16:36, Mikulas Patocka wrote: >> I suppose theoretically it could happen, and I'm happy to change. >> >> However there seems to be precedent in assuming it won't: >> >> - in stripe_op_hints(), we hold chunk_size in an unsigned int >> - in raid0_set_limits(), we hold mddev->chunk_sectors << 9 in lim.io_min, >> which is an unsigned int type. >> >> Please let me know your thoughts on also changing these sort of instances. Is >> it realistic to expect chunk_bytes > UINT_MAX? >> >> Thanks, >> John > dm-stripe can be created with a stripe size that is more than 0xffffffff > bytes. > > Though, the integer overflow already exists in the existing dm-stripe > target: > static void stripe_io_hints(struct dm_target *ti, > struct queue_limits *limits) > { > struct stripe_c *sc = ti->private; > unsigned int chunk_size = sc->chunk_size << SECTOR_SHIFT; > > limits->io_min = chunk_size; > limits->io_opt = chunk_size * sc->stripes; > } > What should we set there as io_min and io_opt if sc->chunk_size << > SECTOR_SHIFT overflows? > Should we set nothing? For io_min/opt, maybe reduce to a factor of the stripe size / width (and which fits in a unsigned int). I am not sure if it is even sane to have such huge values in io_min and the bottom disk io_min should be used directly instead. Martin Petersen might have a better idea.. he added those sysfs files :) Thanks, John