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bug#23904: Btrfs clone support in copy operations

From: Paul Eggert
Subject: bug#23904: Btrfs clone support in copy operations
Date: Sat, 10 Sep 2016 19:16:39 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

I looked into this a bit more, and it appears that there's little point to giving the user an option to clone or not clone when copying files, as the cloning (or not cloning) can occur anyway.

We plan to release a coreutils version soon and to change the default to clone after the release. For Emacs master the next release is far away, so there is plenty of time to try out the FICLONE performance improvement. I installed the attached two patches and am marking this bug report as done.

The second patch merely updates the documentation to discuss the issue; it is logically independent of the first patch, since the issue can occur both with and without the first patch.

Attachment: 0001-copy-file-now-uses-GNU-Linux-file-cloning.patch
Description: Text Data

Attachment: 0002-Document-file-synchronization-issues.patch
Description: Text Data

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