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nfs42: add NFS_IOC_CLONE_RANGE ioctl 

It follows btrfs BTRFS_IOC_CLONE_RANGE lead on ioctl number and
arguments.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Peng Tao 2015-09-26 02:24:39 +08:00 committed by Trond Myklebust
parent 811b7b85d6
commit a340abcf41
2 changed files with 22 additions and 1 deletions
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14
fs/nfs/nfs4file.c
View File

@ -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
}

9
include/uapi/linux/nfs.h
View File

@ -33,7 +33,14 @@
/* 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 _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