Date: Sat, 11 Feb 2012 15:28:59 -0500 From: Pedro Giffuni <pfg@FreeBSD.org> To: freebsd-fs@FreeBSD.org Cc: freebsd-current@FreeBSD.org Subject: [CFT] ext2/3 nanosecond timestamps patch. Message-ID: <4F36CF8B.3000509@FreeBSD.org>
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Hello; I have been working on implementing some ext4 features that can work in ext3 mode in preparation towards bringing some more of the ext4 work Zheng Liu did for his GSoC 2010 project. The first of this features is nanosecond/birthtime timestamping, which basically means that if the filesystem was created with big inodes we carry the nanosecond and birthtime stamps that UFS2 has always supported. Apparently the appropriate fields in the on-disk inode have been approved for a long time but support for this in ext3 has not been widely distributed. In preparation for ext4 most linux distributions did enable by default such bigger inodes and some people do use nanosecond timestamps in ext3. I would really appreciate if ext2/ext3 users test this patch: http://people.freebsd.org/~pfg/patches/patch-ext2fs-ns_timestamps It should apply cleanly to 10-current or to a recent 9.0-stable. IMPORTANT: do avoid testing this patch in old systems that may be using Extended Attributes. You will probably not notice any change but do let me know how it goes. best regards, Pedro. ps. FWIW, while here I also implemented the basic inode versioning stuff from Lustre but it's doesn't seem to any use: http://wiki.lustre.org/images/1/16/Inodever-HLD.pdf
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