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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>
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parent
811b7b85d6
commit
a340abcf41
2 changed files with 22 additions and 1 deletions
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@ -288,14 +288,28 @@ nfs42_ioctl_clone(struct file *dst_file, unsigned long srcfd,
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mnt_drop_write_file(dst_file);
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return ret;
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}
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static long nfs42_ioctl_clone_range(struct file *dst_file, void __user *argp)
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{
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struct nfs_ioctl_clone_range_args args;
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if (copy_from_user(&args, argp, sizeof(args)))
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return -EFAULT;
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return nfs42_ioctl_clone(dst_file, args.src_fd, args.src_off, args.dst_off, args.count);
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}
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#endif /* CONFIG_NFS_V4_2 */
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long nfs4_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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switch (cmd) {
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#ifdef CONFIG_NFS_V4_2
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case NFS_IOC_CLONE:
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return nfs42_ioctl_clone(file, arg, 0, 0, 0);
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case NFS_IOC_CLONE_RANGE:
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return nfs42_ioctl_clone_range(file, argp);
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#endif
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}
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@ -33,7 +33,14 @@
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/* NFS ioctls */
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/* Let's follow btrfs lead on CLONE to avoid messing userspace */
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#define NFS_IOC_CLONE _IOW(0x94, 9, int)
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#define NFS_IOC_CLONE _IOW(0x94, 9, int)
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#define NFS_IOC_CLONE_RANGE _IOW(0x94, 13, int)
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struct nfs_ioctl_clone_range_args {
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__s64 src_fd;
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__u64 src_off, count;
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__u64 dst_off;
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};
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/*
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* NFS stats. The good thing with these values is that NFSv3 errors are
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