HADOOP-11296. Nfs3FileAttributes should not change the values of rdev, nlink and size in the constructor. Contributed by Brandon Li.

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -76,6 +76,9 @@ Release 2.7.0 - UNRELEASED
 
     HADOOP-11289. Fix typo in RpcUtil log message. (Charles Lamb via wheat9)
 
+    HADOOP-11294. Nfs3FileAttributes should not change the values of rdev,
+    nlink and size in the constructor. (Brandon Li via wheat9)
+
 Release 2.6.0 - 2014-11-15
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/nfs3/Nfs3FileAttributes.java

@@ -49,8 +49,6 @@ public class Nfs3FileAttributes {
    * values should be agreed upon by the client and server. If the client and
    * server do not agree upon the values, the client should treat these fields
    * as if they are set to 0.
-   * <br>
-   * For Hadoop, currently this field is always zero.
    */
   public static class Specdata3 {
     final int specdata1;
@@ -82,20 +80,17 @@ public class Nfs3FileAttributes {
   }
    
   public Nfs3FileAttributes() {
-    this(NfsFileType.NFSREG, 0, (short)0, 0, 0, 0, 0, 0, 0, 0);
+    this(NfsFileType.NFSREG, 1, (short)0, 0, 0, 0, 0, 0, 0, 0, new Specdata3());
   }
 
   public Nfs3FileAttributes(NfsFileType nfsType, int nlink, short mode, int uid,
-      int gid, long size, long fsid, long fileId, long mtime, long atime) {
+      int gid, long size, long fsid, long fileId, long mtime, long atime, Specdata3 rdev) {
     this.type = nfsType.toValue();
     this.mode = mode;
-    this.nlink = (type == NfsFileType.NFSDIR.toValue()) ? (nlink + 2) : 1;
+    this.nlink = nlink;
     this.uid = uid;
     this.gid = gid;
     this.size = size;
-    if(type == NfsFileType.NFSDIR.toValue()) {
-      this.size = getDirSize(nlink);
-    }
     this.used = this.size;
     this.rdev = new Specdata3();
     this.fsid = fsid;
@@ -103,6 +98,7 @@ public class Nfs3FileAttributes {
     this.mtime = new NfsTime(mtime);
     this.atime = atime != 0 ? new NfsTime(atime) : this.mtime;
     this.ctime = this.mtime;
+    this.rdev = rdev;
   }
   
   public Nfs3FileAttributes(Nfs3FileAttributes other) {
@@ -147,10 +143,7 @@ public class Nfs3FileAttributes {
     attr.gid = xdr.readInt();
     attr.size = xdr.readHyper();
     attr.used = xdr.readHyper();
-    // Ignore rdev
+    attr.rdev = new Specdata3(xdr.readInt(), xdr.readInt());
-    xdr.readInt();
-    xdr.readInt();
-    attr.rdev = new Specdata3();
     attr.fsid = xdr.readHyper();
     attr.fileId = xdr.readHyper();
     attr.atime = NfsTime.deserialize(xdr);
@@ -228,11 +221,11 @@ public class Nfs3FileAttributes {
     return this.gid;
   }
   
-  /**
+  public Specdata3 getRdev() {
-   * HDFS directory size is always zero. Try to return something meaningful
+    return rdev;
-   * here. Assume each child take 32bytes.
+  }
-   */
+
-  public static long getDirSize(int childNum) {
+  public void setRdev(Specdata3 rdev) {
-    return (childNum + 2) * 32;
+    this.rdev = rdev;
   }
 }

hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/Nfs3Utils.java

@@ -67,11 +67,14 @@ public class Nfs3Utils {
      */
     NfsFileType fileType = fs.isDir() ? NfsFileType.NFSDIR : NfsFileType.NFSREG;
     fileType = fs.isSymlink() ? NfsFileType.NFSLNK : fileType;
-    
+    int nlink = (fileType == NfsFileType.NFSDIR) ? fs.getChildrenNum() + 2 : 1;
-    return new Nfs3FileAttributes(fileType, fs.getChildrenNum(), fs
+    long size = (fileType == NfsFileType.NFSDIR) ? getDirSize(fs
-        .getPermission().toShort(), iug.getUidAllowingUnknown(fs.getOwner()),
+        .getChildrenNum()) : fs.getLen();
-        iug.getGidAllowingUnknown(fs.getGroup()), fs.getLen(), 0 /* fsid */,
+    return new Nfs3FileAttributes(fileType, nlink,
-        fs.getFileId(), fs.getModificationTime(), fs.getAccessTime());
+        fs.getPermission().toShort(), iug.getUidAllowingUnknown(fs.getOwner()),
+        iug.getGidAllowingUnknown(fs.getGroup()), size, 0 /* fsid */,
+        fs.getFileId(), fs.getModificationTime(), fs.getAccessTime(),
+        new Nfs3FileAttributes.Specdata3());
   }
 
   public static Nfs3FileAttributes getFileAttr(DFSClient client,
@@ -80,6 +83,14 @@ public class Nfs3Utils {
     return fs == null ? null : getNfs3FileAttrFromFileStatus(fs, iug);
   }
 
+  /**
+   * HDFS directory size is always zero. Try to return something meaningful
+   * here. Assume each child take 32bytes.
+   */
+  public static long getDirSize(int childNum) {
+    return (childNum + 2) * 32;
+  }
+
   public static WccAttr getWccAttr(DFSClient client, String fileIdPath)
       throws IOException {
     HdfsFileStatus fstat = getFileStatus(client, fileIdPath);
@@ -87,8 +98,8 @@ public class Nfs3Utils {
       return null;
     }
 
-    long size = fstat.isDir() ? Nfs3FileAttributes.getDirSize(fstat
+    long size = fstat.isDir() ? getDirSize(fstat.getChildrenNum()) : fstat
-        .getChildrenNum()) : fstat.getLen();
+        .getLen();
     return new WccAttr(size, new NfsTime(fstat.getModificationTime()),
         new NfsTime(fstat.getModificationTime()));
   }