[PATCH] Snoop SET FEATURES - WRITE CACHE ENABLE/DISABLE command(v5)

This patch makes libata snoop 'SET FEATURES - WRITE CACHE
ENABLE/DISABLE' command, executing requisite revalidation processes
to update cached data.

Signed-off-by: Forrest Zhao <forrest.zhao@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/ata.h b/include/linux/ata.h
index c494e1c0531..3671af86969 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -181,6 +181,9 @@ enum {
         XFER_PIO_0              = 0x08,
         XFER_PIO_SLOW           = 0x00,
 
+        SETFEATURES_WC_ON       = 0x02, /* Enable write cache */
+        SETFEATURES_WC_OFF      = 0x82, /* Disable write cache */
+
         /* ATAPI stuff */
         ATAPI_PKT_DMA           = (1 << 0),
         ATAPI_DMADIR            = (1 << 2),     /* ATAPI data dir: