nfsd41: SUPPATTR_EXCLCREAT attribute

Return bitmask for supported EXCLUSIVE4_1 create attributes.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

3 files changed, 21 insertions, 2 deletions

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 70296fedee41..533d14fec99e 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2148,7 +2148,12 @@ out_acl:
                 }
                 WRITE64(stat.ino);
         }
-        BUG_ON(bmval2); /* FIXME: not implemented yet */
+        if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
+                WRITE32(3);
+                WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
+                WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
+                WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
+        }
 
         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
         *countp = p - buffer;
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 29ed600e193b..ec3cd49b04f5 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -404,6 +404,8 @@ enum lock_type4 {
 #define FATTR4_WORD0_UNIQUE_HANDLES     (1UL << 9)
 #define FATTR4_WORD0_LEASE_TIME         (1UL << 10)
 #define FATTR4_WORD0_RDATTR_ERROR       (1UL << 11)
+/* Mandatory in NFSv4.1 */
+#define FATTR4_WORD2_SUPPATTR_EXCLCREAT (1UL << 11)
 
 /* Recommended Attributes */
 #define FATTR4_WORD0_ACL                (1UL << 12)
diff --git a/include/linux/nfsd/nfsd.h b/include/linux/nfsd/nfsd.h
index 69ca788f8fc5..0ec4d142c503 100644
--- a/include/linux/nfsd/nfsd.h
+++ b/include/linux/nfsd/nfsd.h
@@ -375,7 +375,7 @@ extern struct timeval	nfssvc_boot;
         NFSD4_SUPPORTED_ATTRS_WORD1
 
 #define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
-        NFSD4_SUPPORTED_ATTRS_WORD2
+        (NFSD4_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SUPPATTR_EXCLCREAT)
 
 static inline u32 nfsd_suppattrs0(u32 minorversion)
 {
@@ -407,6 +407,18 @@ static inline u32 nfsd_suppattrs2(u32 minorversion)
  | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
 #define NFSD_WRITEABLE_ATTRS_WORD2 0
 
+#define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
+        NFSD_WRITEABLE_ATTRS_WORD0
+/*
+ * we currently store the exclusive create verifier in the v_{a,m}time
+ * attributes so the client can't set these at create time using EXCLUSIVE4_1
+ */
+#define NFSD_SUPPATTR_EXCLCREAT_WORD1 \
+        (NFSD_WRITEABLE_ATTRS_WORD1 & \
+         ~(FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET))
+#define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
+        NFSD_WRITEABLE_ATTRS_WORD2
+
 #endif /* CONFIG_NFSD_V4 */
 
 #endif /* LINUX_NFSD_NFSD_H */