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[PATCH v6 0/4] SCT Write Same

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  [PATCH v6 0/4] SCT Write Same Shaun Tancheff <shaun@tancheff.com> - 2016-08-22 06:30 +0200
    Re: [PATCH v6 0/4] SCT Write Same Hannes Reinecke <hare@suse.de> - 2016-08-22 08:40 +0200

#1467354 — [PATCH v6 0/4] SCT Write Same

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

    git@github.com:stancheff/linux.git v4.8-rc2+biof.v9

v6:
 - Fix bisect bug reported by Tom Yan <tom.ty89@gmail.com>
 - Change to use sg_copy_from_buffer as per Christoph Hellwig <hch@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(-)

-- 
2.9.3

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#1467392

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
> 
>     git@github.com:stancheff/linux.git v4.8-rc2+biof.v9
> 
> v6:
>  - Fix bisect bug reported by Tom Yan <tom.ty89@gmail.com>
>  - Change to use sg_copy_from_buffer as per Christoph Hellwig <hch@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
hare@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)

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