Bart, On 8/9/17 00:07, Bart Van Assche wrote: > On Tue, 2017-08-08 at 13:17 +0900, Damien Le Moal wrote: >> Releasing the write lock of a zone when the write commnand that > ^^^^^^^^ > command? >> acquired the lock completes can cause deadlocks with scsi-mq due to >> potential queue reordering if the lock owning request is requeued and >> not executed. > > Please note that even with scsi-sq requeueing can cause request reordering.
I am painfully aware of this fact... I will update the commit message to reflect this. >> Since sd_uninit_cmnd() is always called when a request is requeued, >> call sd_zbc_write_unlock_zone() from that function for write requests >> that acquired a zone lock. Acquisition of a zone lock by a write command >> is indicated using the new command flag SCMD_ZONE_WRITE_LOCK. > > Hello Damien, > > Since this patch differs slightly from the version that was posted a few > days ago, should a "v2" label have been added to the subject and should a > changelog have been included? Anyway: Yes, forgot to do that. Reposting. > Reviewed-by: Bart Van Assche <bart.vanass...@wdc.com> Thanks. -- Damien Le Moal, Western Digital
