Re: [PATCH v5 8/9] vfs: Add vfs_copy_file_range() support for pagecache copies
From: Christoph Hellwig <hidden>
Date: 2015-10-13 07:27:37
Also in:
linux-btrfs, linux-fsdevel, linux-nfs
On Mon, Oct 12, 2015 at 04:17:49PM -0700, Darrick J. Wong wrote:
Hm. Peng's patches only generalize the CLONE and CLONE_RANGE ioctls from btrfs, however they don't port over the (vastly different) EXTENT_SAME ioctl. What does everyone think about generalizing EXTENT_SAME? The interface enables one to ask the kernel to dedupe multiple file ranges in a single call. That's more complex than what I was proposing with COPY_FR_DEDUP(E), but I'm assuming that the extra complexity buys us the ability to ... multi-dedupe at the same time, with locks held on the source file? I'm happy to generalize the existing EXTENT_SAME, but please yell if you really hate the interface.
It's not pretty, but if the btrfs folks have a good reason for it I don't see a reason to diverge. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html