Looks like this should do I guess...
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 5a93a5db4fb0..be47e1dd6da5 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3265,6 +3265,14 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
*p++ = cpu_to_be32(stat.mtime.tv_nsec);
}
+ /* support for btime here */
+ if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
+ p = xdr_reserve_space(xdr, 12);
+ if (!p)
+ goto out_resource;
+ p = xdr_encode_hyper(p, (s64)stat.btime.tv_sec);
+ *p++ = cpu_to_be32(stat.btime.tv_nsec);
+ }
if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
struct kstat parent_stat;
u64 ino = stat.ino;
-----Original Message-----
From: bfields@xxxxxxxxxxxx <bfields@xxxxxxxxxxxx>
Sent: středa 5. ledna 2022 16:55
To: Ondrej Valousek <ondrej.valousek.xm@xxxxxxxxxxx>
Cc: Trond Myklebust <trondmy@xxxxxxxxxxxxxxx>; trondmy@xxxxxxxxxx; linux-nfs@xxxxxxxxxxxxxxx; anna.schumaker@xxxxxxxxxx
Subject: Re: [PATCH 0/8] Support btime and other NFSv4 specific attributes
On Wed, Jan 05, 2022 at 03:40:19PM +0000, Ondrej Valousek wrote:
>
> >> - AFAIK support for RFC8276 in NFS (only version 4.2) server is since kernel 5.9, right? NFS client supports these as well?
> >> - The patches below implements the feature in both, nfs client AND server, right?
>
> > Client only.
>
> Right, but then it will be only useful if we use non-linux based NFS server right?
>
> I mean simply:
> 1. $ stat /tmp/foo.txt --> shows birth date
> 2. # exportfs \*/tmp
> 3. # mount 127.0.0.1:/tmp /mnt
> 4. $ stat /mnt/foo.txt --> no birth date shown
Right.
Fixing that's likely just a few lines of code added to fs/nfsd/nfs4xdr.c:nfsd4_encode_fattr(). Patches welcome.
--b.
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