NFSD: Add POSIX ACL file attributes to SUPPATTR bitmasks

Now that infrastructure for NFSv4 POSIX draft ACL has been added
to NFSD, it should be safe to advertise support to NFS clients.

NFSD_SUPPATTR_EXCLCREAT_WORD2 includes NFSv4.2-only attributes,
but version filtering occurs via nfsd_suppattrs[] before this
mask is applied, ensuring pre-4.2 clients never see unsupported
attributes.

Reviewed-by: Jeff Layton <[email protected]>
Signed-off-by: Chuck Lever <[email protected]>

Author: chucklever

fs/nfsd/nfsd.h

@@ -454,6 +454,16 @@ enum {
 #define NFSD4_2_SECURITY_ATTRS		0
 #endif
 
+#ifdef CONFIG_NFSD_V4_POSIX_ACLS
+#define NFSD4_2_POSIX_ACL_ATTRS \
+	(FATTR4_WORD2_ACL_TRUEFORM | \
+	FATTR4_WORD2_ACL_TRUEFORM_SCOPE | \
+	FATTR4_WORD2_POSIX_DEFAULT_ACL | \
+	FATTR4_WORD2_POSIX_ACCESS_ACL)
+#else
+#define NFSD4_2_POSIX_ACL_ATTRS		0
+#endif
+
 #define NFSD4_2_SUPPORTED_ATTRS_WORD2 \
 	(NFSD4_1_SUPPORTED_ATTRS_WORD2 | \
 	FATTR4_WORD2_MODE_UMASK | \
@@ -462,7 +472,8 @@ enum {
 	FATTR4_WORD2_XATTR_SUPPORT | \
 	FATTR4_WORD2_TIME_DELEG_ACCESS | \
 	FATTR4_WORD2_TIME_DELEG_MODIFY | \
-	FATTR4_WORD2_OPEN_ARGUMENTS)
+	FATTR4_WORD2_OPEN_ARGUMENTS | \
+	NFSD4_2_POSIX_ACL_ATTRS)
 
 extern const u32 nfsd_suppattrs[3][3];
 
@@ -530,11 +541,18 @@ static inline bool nfsd_attrs_supported(u32 minorversion, const u32 *bmval)
 #else
 #define MAYBE_FATTR4_WORD2_SECURITY_LABEL 0
 #endif
+#ifdef CONFIG_NFSD_V4_POSIX_ACLS
+#define MAYBE_FATTR4_WORD2_POSIX_ACL_ATTRS \
+	FATTR4_WORD2_POSIX_DEFAULT_ACL | FATTR4_WORD2_POSIX_ACCESS_ACL
+#else
+#define MAYBE_FATTR4_WORD2_POSIX_ACL_ATTRS 0
+#endif
 #define NFSD_WRITEABLE_ATTRS_WORD2 \
 	(FATTR4_WORD2_MODE_UMASK \
 	| MAYBE_FATTR4_WORD2_SECURITY_LABEL \
 	| FATTR4_WORD2_TIME_DELEG_ACCESS \
 	| FATTR4_WORD2_TIME_DELEG_MODIFY \
+	| MAYBE_FATTR4_WORD2_POSIX_ACL_ATTRS \
 	)
 
 #define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
@@ -550,6 +568,10 @@ static inline bool nfsd_attrs_supported(u32 minorversion, const u32 *bmval)
  * The FATTR4_WORD2_TIME_DELEG attributes are not to be allowed for
  * OPEN(create) with EXCLUSIVE4_1. It doesn't make sense to set a
  * delegated timestamp on a new file.
+ *
+ * This mask includes NFSv4.2-only attributes (e.g., POSIX ACLs).
+ * Version filtering occurs via nfsd_suppattrs[] before this mask
+ * is applied, so pre-4.2 clients never see unsupported attributes.
  */
 #define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
 	(NFSD_WRITEABLE_ATTRS_WORD2 & \