Messages in this thread | | | Date | Wed, 04 Jul 2007 15:37:01 +1000 | From | Timothy Shimmin <> | Subject | Re: [PATCH 4/7][TAKE5] support new modes in fallocate |
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Amit K. Arora wrote: >>>> FA_FL_NO_MTIME 0x10 /* keep same mtime (default change on size, data change) */ >>>> FA_FL_NO_CTIME 0x20 /* keep same ctime (default change on size, data change) */ >> NACK to these aswell. If i_size changes c/mtime need updates, if the size >> doesn't chamge they don't. No need to add more flags for this. > > This requirement was from the point of view of HSM applications. Hope > you saw Andreas previous post and are keeping that in mind. > We use this capability in XFS at the moment. I think this is mainly for DMF (HSM) but is done via the xfs handle interface (xfs_open_by_handle) AFAICT.
This sets up a set of invisible operations (xfs_invis_file_operations). xfs_file_ioctl_invis goes on to set IO_INVIS which goes on to set ATTR_DMI which is then tested in xfs_change_file_space() (which handles XFS_IOC_RESVSP & friends) for whether xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG) is called or not.
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