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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
