Messages in this thread | | | Date | Fri, 25 Jun 2010 18:26:51 -0400 | From | Jeff Layton <> | Subject | Re: [RFC][PATCH 06/10] cifs: define inode-level cache object and register them |
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On Fri, 25 Jun 2010 22:46:38 +0100 David Howells <dhowells@redhat.com> wrote:
> Jeff Layton <jlayton@samba.org> wrote: > > > Looks like it mostly uses the ctime. IMO, the mtime would be a better > > choice since it changes less frequently, but I don't guess that it > > matters very much. > > I'd've thought mtime changes more frequently since that's altered when data is > written. ctime is changed when attributes are changed. >
IIUC, updating mtime for a write is also an attribute change, and that affects ctime. According to the stat(2) manpage:
The field st_ctime is changed by writing or by setting inode informa- tion (i.e., owner, group, link count, mode, etc.).
> Note that Ext4 appears to have a file creation time field in its inode > (struct ext4_inode::i_crtime[_extra]). Can Samba be made to use that? >
Is it exposed to userspace in any (standard) way? It would be handy to have that. While we're wishing...it might also be nice to have a standard way to get at the i_generation from userspace too.
-- Jeff Layton <jlayton@samba.org>
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