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Re: Feature request: Make head and tail use ioctl_ficlonerange
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From: |
Vít Novotný |
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Subject: |
Re: Feature request: Make head and tail use ioctl_ficlonerange |
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Date: |
Sat, 1 Jun 2019 23:48:18 +0200 |
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User-agent: |
NeoMutt/20170113 (1.7.2) |
* Florian Weimer:
> * Vít Novotný:
>
> > with the increasing support for copy-on-write (i.e. reflink) in modern
> > filesystems, it seems reasonable for head(1) and tail(1) to try calling
> > ioctl_ficlonerange(2) where available before copying.
>
> How does this relate to the availability of copy_file_range?
Both system calls first appeared in Linux 4.5, but they both serve a
different purpose:
- copy_file_range enables fast in-kernel copying.
- ioctl_ficlonerange enables CoW sharing of data between files.
Best Regards,
Vít
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