On 3/12/25 10:31, Naohiro Aota wrote: > There is a potential deadlock if we do report zones in an IO context. When one > process do a report zones and another process freezes the block device, the > report zones side cannot allocate a tag because the freeze is already started. > This can thus result in new block group creation to hang forever, blocking the > write path. +Shin'ichiro blktest has a failing test case due to a lockdep splat triggered by this. Would be good to add that information (with the splat) here. > > Thankfully, a new block group should be created on empty zones. So, reporting > the zones is not necessary and we can set the write pointer = 0 and load the > zone capacity from the block layer using bdev_zone_capacity() helper. > > CC: stable@xxxxxxxxxxxxxxx # 6.13+ > Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx> With that fixed, looks good to me. Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx> -- Damien Le Moal Western Digital Research
