On Tue, 2007-07-10 at 16:30 -0700, Andrew Morton wrote:
> On Sun, 01 Jul 2007 03:37:04 -0400
> Mingming Cao <cmm@xxxxxxxxxx> wrote:
>
> > This patch converts the 32-bit i_version in the generic inode to a 64-bit
> > i_version field.
> >
>
> That's obvious from the patch. But what was the reason for making this
> (unrelated to ext4) change?
>
The need is came from NFSv4
On Fri, 2007-05-25 at 18:25 +0200, Jean noel Cordenner wrote:
> Hi,
>
> This is an update of the i_version patch.
> The i_version field is a 64bit counter that is set on every inode
> creation and that is incremented every time the inode data is modified
> (similarly to the "ctime" time-stamp).
> The aim is to fulfill a NFSv4 requirement for rfc3530:
> "5.5. Mandatory Attributes - Definitions
> Name # DataType Access Description
> ___________________________________________________________________
> change 3 uint64 READ A value created by the
> server that the client can use to determine if file
> data, directory contents or attributes of the object
> have been modified. The servermay return the object's
> time_metadata attribute for this attribute's value but
> only if the filesystem object can not be updated more
> frequently than the resolution of time_metadata.
> "
>
> Please update the changelog for this.
>
Is above description clear to you?
> > Index: linux-2.6.21/include/linux/fs.h
> > ===================================================================
> > --- linux-2.6.21.orig/include/linux/fs.h
> > +++ linux-2.6.21/include/linux/fs.h
> > @@ -549,7 +549,7 @@ struct inode {
> > uid_t i_uid;
> > gid_t i_gid;
> > dev_t i_rdev;
> > - unsigned long i_version;
> > + u64 i_version;
> > loff_t i_size;
> > #ifdef __NEED_I_SIZE_ORDERED
> > seqcount_t i_size_seqcount;
>
-
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