Add an ioctl which can be used to clone a block range within a single
block device. This is useful for testing the copy offload code.
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
---
block/ioctl.c | 35 +++++++++++++++++++++++++++++++++++
include/uapi/linux/fs.h | 1 +
2 files changed, 36 insertions(+)
diff --git a/block/ioctl.c b/block/ioctl.c
index 7d5c3b20af45..5efb6e666f18 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -201,6 +201,29 @@ static int blk_ioctl_zeroout(struct block_device *bdev, uint64_t start,
return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL);
}
+static int blk_ioctl_copy(struct block_device *bdev, uint64_t src_offset,
+ uint64_t dst_offset, uint64_t len)
+{
+ if (src_offset & 511)
+ return -EINVAL;
+ if (dst_offset & 511)
+ return -EINVAL;
+ if (len & 511)
+ return -EINVAL;
+ src_offset >>= 9;
+ dst_offset >>= 9;
+ len >>= 9;
+
+ if (src_offset + len > (i_size_read(bdev->bd_inode) >> 9))
+ return -EINVAL;
+
+ if (dst_offset + len > (i_size_read(bdev->bd_inode) >> 9))
+ return -EINVAL;
+
+ return blkdev_issue_copy(bdev, src_offset, bdev, dst_offset, len,
+ GFP_KERNEL);
+}
+
static int put_ushort(unsigned long arg, unsigned short val)
{
return put_user(val, (unsigned short __user *)arg);
@@ -328,6 +351,18 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
return blk_ioctl_zeroout(bdev, range[0], range[1]);
}
+ case BLKCOPY: {
+ uint64_t range[3];
+
+ if (!(mode & FMODE_WRITE))
+ return -EBADF;
+
+ if (copy_from_user(range, (void __user *)arg, sizeof(range)))
+ return -EFAULT;
+
+ return blk_ioctl_copy(bdev, range[0], range[1], range[2]);
+ }
+
case HDIO_GETGEO: {
struct hd_geometry geo;
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index ca1a11bb4443..195c2c4cbacc 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -149,6 +149,7 @@ struct inodes_stat_t {
#define BLKSECDISCARD _IO(0x12,125)
#define BLKROTATIONAL _IO(0x12,126)
#define BLKZEROOUT _IO(0x12,127)
+#define BLKCOPY _IO(0x12,128)
#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
#define FIBMAP _IO(0x00,1) /* bmap access */
--
1.9.0
--
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