On 7/3/18 11:35 AM, Mikulas Patocka wrote: > Discarding can take very long time for some device mapper targets, this > patch makes it possible to kill a process that issues the BLKDISCARD > ioctl. > > Note that some filesystems call blkdev_issue_discard or > __blkdev_issue_discard directly, they may not be prepared to handle the > failure, so this patch introduces a flag BLKDEV_DISCARD_KILLABLE that is > only set when the discard is initiated by an ioctl. This might be cleaner as a regular request flag, since killable can apply to other types of IO as well - like readahead. -- Jens Axboe
