[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>
diff --git a/include/linux/ata.h b/include/linux/ata.h
index c494e1c..3671af8 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -181,6 +181,9 @@
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: