block: add secure discard
Secure discard is the same as discard except that all copies of the
discarded sectors (perhaps created by garbage collection) must also be
erased.
Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Cc: Kyungmin Park <kmpark@infradead.org>
Cc: Madhusudhan Chikkature <madhu.cr@ti.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ben Gardiner <bengardiner@nanometrics.ca>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/block/ioctl.c b/block/ioctl.c
index 09fd7f1..d8052f0 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -114,8 +114,10 @@
}
static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
- uint64_t len)
+ uint64_t len, int secure)
{
+ unsigned long flags = BLKDEV_IFL_WAIT;
+
if (start & 511)
return -EINVAL;
if (len & 511)
@@ -125,8 +127,9 @@
if (start + len > (bdev->bd_inode->i_size >> 9))
return -EINVAL;
- return blkdev_issue_discard(bdev, start, len, GFP_KERNEL,
- BLKDEV_IFL_WAIT);
+ if (secure)
+ flags |= BLKDEV_IFL_SECURE;
+ return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
}
static int put_ushort(unsigned long arg, unsigned short val)
@@ -213,7 +216,8 @@
set_device_ro(bdev, n);
return 0;
- case BLKDISCARD: {
+ case BLKDISCARD:
+ case BLKSECDISCARD: {
uint64_t range[2];
if (!(mode & FMODE_WRITE))
@@ -222,7 +226,8 @@
if (copy_from_user(range, (void __user *)arg, sizeof(range)))
return -EFAULT;
- return blk_ioctl_discard(bdev, range[0], range[1]);
+ return blk_ioctl_discard(bdev, range[0], range[1],
+ cmd == BLKSECDISCARD);
}
case HDIO_GETGEO: {
