On 10/07/2015 09:40 PM, Neil Brown wrote:
> Anna Schumaker <Anna.Schumaker@xxxxxxxxxx> writes:
>
>> @@ -1338,34 +1362,26 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
>> struct file *file_out, loff_t pos_out,
>> size_t len, unsigned int flags)
>> {
>> - struct inode *inode_in;
>> - struct inode *inode_out;
>> ssize_t ret;
>>
>> - if (flags)
>> + /* Flags should only be used exclusively. */
>> + if ((flags & COPY_FR_COPY) && (flags & ~COPY_FR_COPY))
>> + return -EINVAL;
>> + if ((flags & COPY_FR_REFLINK) && (flags & ~COPY_FR_REFLINK))
>> + return -EINVAL;
>> + if ((flags & COPY_FR_DEDUP) && (flags & ~COPY_FR_DEDUP))
>> return -EINVAL;
>>
>
> Do you also need:
>
> if (flags & ~(COPY_FR_COPY | COPY_FR_REFLINK | COPY_FR_DEDUP))
> return -EINVAL;
>
> so that future user-space can test if the kernel supports new flags?
Probably. I'll add that in!
Thanks,
Anna
>
> NeilBrown
>
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