RE: [PATCH 0/8] Support btime and other NFSv4 specific attributes

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> You also need to update the value of NFSD4_SUPPORTED_ATTRS_WORD1 to reflect the new support for FATTR4_WORD1_TIME_CREATE.

Yes, I realized that one shortly after I sent the mail.
Just going to try this patch:

[ondrejv@skynet19 /opt/kernel/linux-git/fs/nfsd]$ git diff
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;
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index 498e5a489826..5ef056ce7591 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -364,7 +364,7 @@ void                nfsd_lockd_shutdown(void);
  | FATTR4_WORD1_OWNER          | FATTR4_WORD1_OWNER_GROUP  | FATTR4_WORD1_RAWDEV           \
  | FATTR4_WORD1_SPACE_AVAIL     | FATTR4_WORD1_SPACE_FREE   | FATTR4_WORD1_SPACE_TOTAL      \
  | FATTR4_WORD1_SPACE_USED      | FATTR4_WORD1_TIME_ACCESS  | FATTR4_WORD1_TIME_ACCESS_SET  \
- | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA    \
+ | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA   | FATTR4_WORD1_TIME_CREATE      \
  | FATTR4_WORD1_TIME_MODIFY     | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)

 #define NFSD4_SUPPORTED_ATTRS_WORD2 0


... will see

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