From: Joshi <joshiiitr@gmail.com>
To: linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org
Subject: cross-fs copy support
Date: Mon, 1 Oct 2018 20:02:17 +0530 [thread overview]
Message-ID: <CA+1E3rLXPwzfO3ro49ZVg7RfpYon5YDB6Y_zqu60ivpgn4wenw@mail.gmail.com> (raw)
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
next reply other threads:[~2018-10-01 21:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-01 14:32 Joshi [this message]
2018-10-01 14:48 ` Qu Wenruo
2018-10-01 15:15 ` Joshi
2018-10-01 15:49 ` Eric Sandeen
2018-10-01 19:51 ` Andreas Dilger
2018-10-02 8:15 ` David Sterba
2018-10-02 15:19 ` Darrick J. Wong
2018-10-02 18:28 ` J. Bruce Fields
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