nfsd: update mtime/ctime on CLONE in presense of delegated attributes

When delegated attributes are given on open, the file is opened with
NOCMTIME and modifying operations do not update mtime/ctime as to not get
out-of-sync with the client's delegated view. However, for CLONE operation,
the server should update its view of mtime/ctime and reflect that in any
GETATTR queries.

Fixes: e5e9b24ab8fa ("nfsd: freeze c/mtime updates with outstanding WRITE_ATTRS delegation")
Cc: stable@vger.kernel.org
Signed-off-by: Olga Kornievskaia <okorniev@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

3 files changed, 33 insertions, 15 deletions

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 2797da8cc950..5de8f37df78a 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1413,6 +1413,9 @@ nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 			dst, clone->cl_dst_pos, clone->cl_count,
 			EX_ISSYNC(cstate->current_fh.fh_export));
 
+	if (!status && (READ_ONCE(dst->nf_file->f_mode) & FMODE_NOCMTIME) != 0)
+		nfsd_update_cmtime_attr(dst->nf_file, 0);
+
 	nfsd_file_put(dst);
 	nfsd_file_put(src);
 out:
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index a9f7bd491b8c..3cd8b3b59de4 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1221,10 +1221,6 @@ static void put_deleg_file(struct nfs4_file *fp)
 
 static void nfsd4_finalize_deleg_timestamps(struct nfs4_delegation *dp, struct file *f)
 {
-	struct iattr ia = { .ia_valid = ATTR_ATIME | ATTR_CTIME | ATTR_MTIME | ATTR_DELEG };
-	struct inode *inode = file_inode(f);
-	int ret;
-
 	/* don't do anything if FMODE_NOCMTIME isn't set */
 	if ((READ_ONCE(f->f_mode) & FMODE_NOCMTIME) == 0)
 		return;
@@ -1242,17 +1238,7 @@ static void nfsd4_finalize_deleg_timestamps(struct nfs4_delegation *dp, struct f
 		return;
 
 	/* Stamp everything to "now" */
-	inode_lock(inode);
-	ret = notify_change(&nop_mnt_idmap, f->f_path.dentry, &ia, NULL);
-	inode_unlock(inode);
-	if (ret) {
-		struct inode *inode = file_inode(f);
-
-		pr_notice_ratelimited("nfsd: Unable to update timestamps on inode %02x:%02x:%lu: %d\n",
-					MAJOR(inode->i_sb->s_dev),
-					MINOR(inode->i_sb->s_dev),
-					inode->i_ino, ret);
-	}
+	nfsd_update_cmtime_attr(f, ATTR_ATIME);
 }
 
 static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
@@ -9563,3 +9549,31 @@ out_delegees:
 	put_nfs4_file(fp);
 	return ERR_PTR(status);
 }
+
+/**
+ * nfsd_update_cmtime_attr - update file's delegated ctime/mtime,
+ *                           and optionally other attributes (ie ATTR_ATIME).
+ * @f: pointer to an opened file
+ * @flags: any additional flags that should be updated
+ *
+ * Given upon opening a file delegated attributes were issues, update
+ * @f attributes to current times.
+ */
+void nfsd_update_cmtime_attr(struct file *f, unsigned int flags)
+{
+	int ret;
+	struct inode *inode = file_inode(f);
+	struct iattr attr = {
+		.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_DELEG | flags,
+	};
+
+	inode_lock(inode);
+	ret = notify_change(&nop_mnt_idmap, f->f_path.dentry, &attr, NULL);
+	inode_unlock(inode);
+	if (ret)
+		pr_notice_ratelimited("nfsd: Unable to update timestamps on "
+				      "inode %02x:%02x:%lu: %d\n",
+				      MAJOR(inode->i_sb->s_dev),
+				      MINOR(inode->i_sb->s_dev),
+				      inode->i_ino, ret);
+}
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 953675eba5c3..c5ccea64c281 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -843,6 +843,7 @@ extern void nfsd4_shutdown_copy(struct nfs4_client *clp);
 void nfsd4_put_client(struct nfs4_client *clp);
 void nfsd4_async_copy_reaper(struct nfsd_net *nn);
 bool nfsd4_has_active_async_copies(struct nfs4_client *clp);
+void nfsd_update_cmtime_attr(struct file *f, unsigned int flags);
 extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(struct xdr_netobj name,
 				struct xdr_netobj princhash, struct nfsd_net *nn);
 extern bool nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn);