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From: Adrian Hunter on 13 Jun 2010 06:50
From 2bca77333187190bacb3e8b6f79a51ee11be62b5 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter(a)nokia.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(a)nokia.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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Prev: [PATCH V2 0/4] Add MMC erase and secure erase
Next: Complex filesystem operations: split and join