On Fri, 6 Jul 2018, Jens Axboe wrote: > 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 blkdev_issue_discard and __blkdev_issue_discard doesn't take flags for the request - it has a "flags" argument which could only contain one flag - BLKDEV_DISCARD_SECURE. Do you want to copy the "flags" argument from blkdev_issue_discard to the bio and check the bio flag in generic_make_request? Mikulas
