On 08/22/2016 06:23 AM, Shaun Tancheff wrote: > At some point the method of issuing Write Same for ATA drives changed. > Currently write same is commonly available via SCT so expose the SCT > capabilities and use SCT Write Same when it is available. > > This is useful for zoned based media that prefers to support discard > with lbprz set, aka discard zeroes data by mapping discard operations to > reset write pointer operations. Conventional zones that do not support > reset write pointer can still honor the discard zeroes data by issuing > a write same over the zone. > > It may also be nice to know if various controllers that currently > disable WRITE SAME will work with the SCT Write Same code path: > aacraid, arcmsr, megaraid, 3w-9xxx, 3w-sas, 3w-xxxx, gdth, hpsa, ips, > megaraid, pmcraid, storvsc_drv > > This patch against v4.8-rc2 is also at > https://github.com/stancheff/linux/tree/v4.8-rc2%2Bbiof.v9 > > g...@github.com:stancheff/linux.git v4.8-rc2+biof.v9 > > v6: > - Fix bisect bug reported by Tom Yan <tom.t...@gmail.com> > - Change to use sg_copy_from_buffer as per Christoph Hellwig <h...@lst.de> > - Added support for a sector_size descriptor other than 512 bytes. > v5: > - Addressed review comments > - Report support for ZBC only for zoned devices. > - kmap page during rewrite > - Fix unmap set to require trim or error, if not unmap then sct write > same or error. > v4: > - Added partial MAINTENANCE_IN opcode simulation > - Dropped all changes in drivers/scsi/* > - Changed to honor the UNMAP flag -> TRIM, no UNMAP -> SCT. > v3: > - Demux UNMAP/TRIM from WRITE SAME > v2: > - Remove fugly ata hacking from sd.c > > Shaun Tancheff (4): > libata: Safely overwrite attached page in WRITE SAME xlat > Add support for SCT Write Same > SCT Write Same / DSM Trim > SCT Write Same handle ATA_DFLAG_PIO > > drivers/ata/libata-scsi.c | 280 > +++++++++++++++++++++++++++++++++++++++++----- > include/linux/ata.h | 69 +++++++----- > 2 files changed, 292 insertions(+), 57 deletions(-) > Thanks for doing this. It has been on my To-Do list for a long time, and it's good to see the UNMAP/TRIM SATL cleaned up finally.
Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking h...@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg)
