creation time stamps for ext4 ?

Andreas Dilger adilger at
Thu Oct 5 20:07:26 UTC 2006

On Oct 05, 2006  12:55 -0400, Theodore Tso wrote:
> > I've given this some thought for adding creation time as part of the nsec
> > timestamp patch.  That is more feasable if we move the nsec ctime into
> > the main inode to double as the version field.
> Shoehorning an extra creation time field into the inode is relatively
> easy, but it's also necessary to have system calls to get and set the
> creation time.  The stat structure doesn't have room for the creation
> time, so that means a new version of the stat structure exported the
> kernel, and a new version of the stat structure exported by glibc.

For Lustre and NFSv4, an in-kernel interface is sufficient.

I was thinking that as a preliminary userspace interface we can use
getxattr with a standard name like user.crtime.  Storing the crtime
directly in the inode is more efficient than a separate EA, but it would
also be compatible if Samba wanted to use real EAs to store this in the
absence of large inodes.

Cheers, Andreas
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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