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Yang
Asked: 2012-04-24 22:42:21 +0800 CST

Does dm-crypt support journaling filesystem transactional guarantees?

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I'm considering using ext4 on encrypted LVM (which uses LUKS and dm-crypt). Will the transactional guarantees in ext4's journaling be preserved?

Bonus: where may I find authoritative information on this (besides the source)?

lvm encryption ext4 disk-encryption

2 Answers

  1. Yes, it does, according to the reply on the dm-crypt mailing list: http://www.saout.de/pipermail/dm-crypt/2012-April/002441.html

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  2. Meanwhile I'm not 100 % sure regarding what kind of EXT4 transactional guarantees you're talking about, I'd suggest trying mounting with write barriers turned on (by default, IIRC) and see whether it's supported.

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