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Message-ID: <CA+1E3rLXPwzfO3ro49ZVg7RfpYon5YDB6Y_zqu60ivpgn4wenw@mail.gmail.com>
Date: Mon, 1 Oct 2018 20:02:17 +0530
From: Joshi <joshiiitr@...il.com>
To: linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: cross-fs copy support
I was wondering about the cross-fs copy through copy_file_range.
It seems current implement has below check, that disables such copy.
1577 /* this could be relaxed once a method supports cross-fs copies */
1578 if (inode_in->i_sb != inode_out->i_sb)
1579 return -EXDEV;
May I know what are the thoughts behind disabling cross-fs copy?
Code has the comment "once a method supports", but that leaves me
wondering exactly what 'method' is expected, and from whom.
I disabled the check, and copy across volumes seemed to work fine. At
least for a single file (1G size), with no data mismatch, and faster
speed than regular copy.
--
Joshi
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