linux-kernel - [PATCH V2 1/4] block: Add BLKSECDISCARD

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Date:	Sun, 13 Jun 2010 13:01:39 +0300
From:	Adrian Hunter <adrian.hunter@...ia.com>
To:	jens.axboe@...cle.com
CC:	hch@....de, Andrew Morton <akpm@...ux-foundation.org>,
	Kyungmin Park <kmpark@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Madhusudhan Chikkature <madhu.cr@...com>
Subject: [PATCH V2 1/4] block: Add BLKSECDISCARD

>From 2bca77333187190bacb3e8b6f79a51ee11be62b5 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@...ia.com>
Date: Thu, 3 Jun 2010 10:46:04 +0300
Subject: [PATCH 1/4] block: Add BLKSECDISCARD

eMMC v4.4 cards can provide a secure erase operation
which guarantees that all copies of the discarded sectors (for
example created by garbage collection) will also be erased.  For
this a new ioctl BLKSECDISCARD is added.

Signed-off-by: Adrian Hunter <adrian.hunter@...ia.com>
---
 block/compat_ioctl.c |    1 +
 block/ioctl.c        |    5 +++++
 include/linux/fs.h   |    1 +
 3 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index f26051f..24a146d 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -753,6 +753,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 	case BLKFLSBUF:
 	case BLKROSET:
 	case BLKDISCARD:
+	case BLKSECDISCARD:
 	/*
 	 * the ones below are implemented in blkdev_locked_ioctl,
 	 * but we call blkdev_ioctl, which gets the lock for us
diff --git a/block/ioctl.c b/block/ioctl.c
index e8eb679..bc5c19c 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -238,6 +238,11 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
 		return blk_ioctl_discard(bdev, range[0], range[1]);
 	}
 
+	case BLKSECDISCARD:
+		if (!(mode & FMODE_WRITE))
+			return -EBADF;
+		return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
+
 	case HDIO_GETGEO: {
 		struct hd_geometry geo;
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 471e1ff..ed06568 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -309,6 +309,7 @@ struct inodes_stat_t {
 #define BLKALIGNOFF _IO(0x12,122)
 #define BLKPBSZGET _IO(0x12,123)
 #define BLKDISCARDZEROES _IO(0x12,124)
+#define BLKSECDISCARD _IO(0x12,125)
 
 #define BMAP_IOCTL 1		/* obsolete - kept for compatibility */
 #define FIBMAP	   _IO(0x00,1)	/* bmap access */
-- 
1.6.3.3
--
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