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Commit 66ba32dc authored by Martin K. Petersen's avatar Martin K. Petersen Committed by Jens Axboe
Browse files

block: ioctl to zero block ranges 



Introduce a BLKZEROOUT ioctl which can be used to clear block ranges by
way of blkdev_issue_zeroout().

Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Acked-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 579e8f3c

block/ioctl.c

+27 −0
Original line number Diff line number Diff line
@@ -185,6 +185,22 @@ static int blk_ioctl_discard(struct block_device *bdev, uint64_t start, 
	return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);

}



static int blk_ioctl_zeroout(struct block_device *bdev, uint64_t start,

			     uint64_t len)

{

	if (start & 511)

		return -EINVAL;

	if (len & 511)

		return -EINVAL;

	start >>= 9;

	len >>= 9;



	if (start + len > (i_size_read(bdev->bd_inode) >> 9))

		return -EINVAL;



	return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL);

}



static int put_ushort(unsigned long arg, unsigned short val)

{

	return put_user(val, (unsigned short __user *)arg);
@@ -300,6 +316,17 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, 
		return blk_ioctl_discard(bdev, range[0], range[1],

					 cmd == BLKSECDISCARD);

	}

	case BLKZEROOUT: {

		uint64_t range[2];



		if (!(mode & FMODE_WRITE))

			return -EBADF;



		if (copy_from_user(range, (void __user *)arg, sizeof(range)))

			return -EFAULT;



		return blk_ioctl_zeroout(bdev, range[0], range[1]);

	}



	case HDIO_GETGEO: {

		struct hd_geometry geo;

include/linux/fs.h

+1 −0
Original line number Diff line number Diff line
@@ -335,6 +335,7 @@ struct inodes_stat_t { 
#define BLKDISCARDZEROES _IO(0x12,124)

#define BLKSECDISCARD _IO(0x12,125)

#define BLKROTATIONAL _IO(0x12,126)

#define BLKZEROOUT _IO(0x12,127)



#define BMAP_IOCTL 1		/* obsolete - kept for compatibility */

#define FIBMAP	   _IO(0x00,1)	/* bmap access */