On 07/05/2012 08:18 AM, Paolo Bonzini wrote:

The cache_type file in sysfs lets users configure the disk cache in
write-through or write-back modes.  However, ata disks do not support
writing to the file because they do not implement the MODE SELECT
command.

This patch adds a translation from MODE SELECT (for the caching page
only) to the ATA SET FEATURES command.  The set of changeable parameters
answered by MODE SENSE is also adjusted accordingly.

Cc: Sergei Shtylyov <redacted>
Cc: Jeff Garzik <redacted>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
	v2->v3: ensure that only the first page of the sg list is
	accessed

  drivers/ata/libata-scsi.c |  194 +++++++++++++++++++++++++++++++++++++++++++--
  1 files changed, 188 insertions(+), 6 deletions(-)

applied 1-2