Commit a340abcf authored by Peng Tao's avatar Peng Tao Committed by Trond Myklebust
Browse files

nfs42: add NFS_IOC_CLONE_RANGE ioctl 



It follows btrfs BTRFS_IOC_CLONE_RANGE lead on ioctl number and
arguments.

Signed-off-by: default avatarPeng Tao <tao.peng@primarydata.com>
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@primarydata.com>
parent 811b7b85

fs/nfs/nfs4file.c

+14 −0
Original line number Diff line number Diff line
@@ -288,14 +288,28 @@ nfs42_ioctl_clone(struct file *dst_file, unsigned long srcfd, 
	mnt_drop_write_file(dst_file);

	return ret;

}



static long nfs42_ioctl_clone_range(struct file *dst_file, void __user *argp)

{

	struct nfs_ioctl_clone_range_args args;



	if (copy_from_user(&args, argp, sizeof(args)))

		return -EFAULT;



	return nfs42_ioctl_clone(dst_file, args.src_fd, args.src_off, args.dst_off, args.count);

}

#endif /* CONFIG_NFS_V4_2 */



long nfs4_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

{

	void __user *argp = (void __user *)arg;



	switch (cmd) {

#ifdef CONFIG_NFS_V4_2

	case NFS_IOC_CLONE:

		return nfs42_ioctl_clone(file, arg, 0, 0, 0);

	case NFS_IOC_CLONE_RANGE:

		return nfs42_ioctl_clone_range(file, argp);

#endif

	}

include/uapi/linux/nfs.h

+8 −1
Original line number Diff line number Diff line
@@ -34,6 +34,13 @@ 
/* NFS ioctls */

/* Let's follow btrfs lead on CLONE to avoid messing userspace */

#define NFS_IOC_CLONE		_IOW(0x94, 9, int)

#define NFS_IOC_CLONE_RANGE	_IOW(0x94, 13, int)



struct nfs_ioctl_clone_range_args {

	__s64 src_fd;

	__u64 src_off, count;

	__u64 dst_off;

};



/*

 * NFS stats. The good thing with these values is that NFSv3 errors are