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From:   "J. Bruce Fields" <bfields@fieldses.org>
To:     Chuck Lever <chuck.lever@oracle.com>
Cc:     linux-nfs@vger.kernel.org, "J. Bruce Fields" <bfields@redhat.com>
Subject: [PATCH 3/5] nfsd: minor nfsd4_change_attribute cleanup
Date:   Mon, 30 Nov 2020 14:38:55 -0500
Message-Id: <1606765137-17257-3-git-send-email-bfields@fieldses.org>
In-Reply-To: <1606765137-17257-1-git-send-email-bfields@fieldses.org>
References: <1606765137-17257-1-git-send-email-bfields@fieldses.org>
Precedence: bulk

From: "J. Bruce Fields" <bfields@redhat.com>

Minor cleanup, no change in behavior.

Also pull out a common helper that'll be useful elsewhere.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---
 fs/nfsd/nfsfh.h          | 13 +++++--------
 include/linux/iversion.h | 13 +++++++++++++
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/fs/nfsd/nfsfh.h b/fs/nfsd/nfsfh.h
index 3faf5974fa4e..45bd776290d5 100644
--- a/fs/nfsd/nfsfh.h
+++ b/fs/nfsd/nfsfh.h
@@ -259,19 +259,16 @@ fh_clear_wcc(struct svc_fh *fhp)
 static inline u64 nfsd4_change_attribute(struct kstat *stat,
 					 struct inode *inode)
 {
-	u64 chattr;
-
 	if (IS_I_VERSION(inode)) {
+		u64 chattr;
+
 		chattr =  stat->ctime.tv_sec;
 		chattr <<= 30;
 		chattr += stat->ctime.tv_nsec;
 		chattr += inode_query_iversion(inode);
-	} else {
-		chattr = cpu_to_be32(stat->ctime.tv_sec);
-		chattr <<= 32;
-		chattr += cpu_to_be32(stat->ctime.tv_nsec);
-	}
-	return chattr;
+		return chattr;
+	} else
+		return time_to_chattr(&stat->ctime);
 }
 
 extern void fill_pre_wcc(struct svc_fh *fhp);
diff --git a/include/linux/iversion.h b/include/linux/iversion.h
index 2917ef990d43..3bfebde5a1a6 100644
--- a/include/linux/iversion.h
+++ b/include/linux/iversion.h
@@ -328,6 +328,19 @@ inode_query_iversion(struct inode *inode)
 	return cur >> I_VERSION_QUERIED_SHIFT;
 }
 
+/*
+ * For filesystems without any sort of change attribute, the best we can
+ * do is fake one up from the ctime:
+ */
+static inline u64 time_to_chattr(struct timespec64 *t)
+{
+	u64 chattr = t->tv_sec;
+
+	chattr <<= 32;
+	chattr += t->tv_nsec;
+	return chattr;
+}
+
 /**
  * inode_eq_iversion_raw - check whether the raw i_version counter has changed
  * @inode: inode to check
-- 
2.28.0