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From:   Ondrej Valousek <ondrej.valousek.xm@renesas.com>
To:     Chuck Lever III <chuck.lever@oracle.com>,
        Bruce Fields <bfields@fieldses.org>
CC:     Trond Myklebust <trondmy@hammerspace.com>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Subject: [PATCH 1/1] nfsd: Add support for btime
Thread-Topic: [PATCH 1/1] nfsd: Add support for btime
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Date:   Mon, 10 Jan 2022 09:53:35 +0000
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List-ID: <linux-nfs.vger.kernel.org>
X-Mailing-List: linux-nfs@vger.kernel.org

Hi Bruce/kernel maintainers,

Please help to submit the following patch into kernel.
Legal stuff: It is OK for Renesas to submit this code into kernel - and bes=
ides, it Bruce's patch in fact as he told me what to do.

Signed-off-by: Ondrej Valousek <ondrej.valousek.xm@renesas.com>
---
Short description:
Adds support for "btime" fattr into nfsd
Long Description:
For filesystems that supports "btime" timestamp (i.e. most modern filesyste=
ms do) we share it via kernel nfsd. Btime support for NFS client has alread=
y been added by Trond recently

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 5a93a5db4fb0..876b317a4cae 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2865,6 +2865,9 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc=
_fh *fhp,
        err =3D vfs_getattr(&path, &stat, STATX_BASIC_STATS, AT_STATX_SYNC_=
AS_STAT);
        if (err)
                goto out_nfserr;
+       if (!(stat.result_mask & STATX_BTIME))
+               /* underlying FS does not offer btime so we can't share it =
*/
+               bmval1 &=3D ~FATTR4_WORD1_TIME_CREATE;
        if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
                        FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) |=
|
            (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
@@ -3265,6 +3268,14 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct sv=
c_fh *fhp,
                p =3D xdr_encode_hyper(p, (s64)stat.mtime.tv_sec);
                *p++ =3D cpu_to_be32(stat.mtime.tv_nsec);
        }
+       /* support for btime here */
+        if (bmval1 & FATTR4_WORD1_TIME_CREATE) {
+                p =3D xdr_reserve_space(xdr, 12);
+                if (!p)
+                        goto out_resource;
+                p =3D xdr_encode_hyper(p, (s64)stat.btime.tv_sec);
+                *p++ =3D cpu_to_be32(stat.btime.tv_nsec);
+        }
        if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
                struct kstat parent_stat;
                u64 ino =3D 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_WO=
RD1_MOUNTED_ON_FILEID)

 #define NFSD4_SUPPORTED_ATTRS_WORD2 0
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