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 <sshtylyov@xxxxxxxxxx> Cc: Jeff Garzik <jgarzik@xxxxxxxxx> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> --- 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(-)
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