Avoid re-setting (and sending) xattrs on a hard-linked file w/the same xattrs.

Improved the xattrs testing to include hard-linking.

.gitignore

@@ -39,4 +39,5 @@ config.status
 /support/savetransfer
 /testsuite/chown-fake.test
 /testsuite/devices-fake.test
+/testsuite/xattrs-hlink.test
 /patches

Makefile.in

@@ -49,7 +49,7 @@ TLS_OBJ = tls.o syscall.o lib/compat.o lib/snprintf.o lib/permstring.o lib/sysxa
 CHECK_PROGS = rsync$(EXEEXT) tls$(EXEEXT) getgroups$(EXEEXT) getfsdev$(EXEEXT) \
 	testrun$(EXEEXT) trimslash$(EXEEXT) t_unsafe$(EXEEXT) wildtest$(EXEEXT)
 
-CHECK_SYMLINKS = testsuite/chown-fake.test testsuite/devices-fake.test
+CHECK_SYMLINKS = testsuite/chown-fake.test testsuite/devices-fake.test testsuite/xattrs-hlink.test
 
 # Objects for CHECK_PROGS to clean
 CHECK_OBJS=tls.o testrun.o getgroups.o getfsdev.o t_stub.o t_unsafe.o trimslash.o wildtest.o
@@ -256,6 +256,9 @@ testsuite/chown-fake.test:
 testsuite/devices-fake.test:
 	ln -s devices.test $(srcdir)/testsuite/devices-fake.test
 
+testsuite/xattrs-hlink.test:
+	ln -s xattrs.test $(srcdir)/testsuite/xattrs-hlink.test
+
 # This does *not* depend on building or installing: you can use it to
 # check a version installed from a binary or some other source tree,
 # if you want.

NEWS

@@ -95,8 +95,8 @@ Changes since 3.0.4:
     - When replacing a non-dir with a symlink/hard-link/device/special-file,
       the update should now be done in an atomic manner.
 
-    - Fixed a free of the wrong pointer in uncache_tmp_xattrs() (which only
+    - Avoid re-sending xattr info for hard-linked files w/the same xattrs
-      sometimes affects an --xattr transfer when --backup is used).
+      (protocol 31).
 
     - When backing up a file, try to hard-link the file into place so that the
       upcoming replacement of the destination file will be atomic.

generator.c

@@ -549,8 +549,10 @@ void itemize(const char *fnamecmp, struct file_struct *file, int ndx, int statre
 #ifdef SUPPORT_XATTRS
 			if (preserve_xattrs && do_xfers
 			 && iflags & (ITEM_REPORT_XATTR|ITEM_TRANSFER)) {
-				send_xattr_request(NULL, file,
+				int fd = iflags & ITEM_REPORT_XATTR
-					iflags & ITEM_REPORT_XATTR ? sock_f_out : -1);
+				      && (protocol_version < 31 || !BITS_SET(iflags, ITEM_XNAME_FOLLOWS|ITEM_LOCAL_CHANGE))
+				       ? sock_f_out : -1;
+				send_xattr_request(NULL, file, fd);
 			}
 #endif
 		} else if (ndx >= 0) {

receiver.c

@@ -548,14 +548,16 @@ int recv_files(int f_in, int f_out, char *local_name)
 			rprintf(FINFO, "recv_files(%s)\n", fname);
 
 #ifdef SUPPORT_XATTRS
-		if (iflags & ITEM_REPORT_XATTR && do_xfers)
+		if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers
+		 && (protocol_version < 31 || !BITS_SET(iflags, ITEM_XNAME_FOLLOWS|ITEM_LOCAL_CHANGE)))
 			recv_xattr_request(file, f_in);
 #endif
 
 		if (!(iflags & ITEM_TRANSFER)) {
 			maybe_log_item(file, iflags, itemizing, xname);
 #ifdef SUPPORT_XATTRS
-			if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers)
+			if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers
+			 && !BITS_SET(iflags, ITEM_XNAME_FOLLOWS|ITEM_LOCAL_CHANGE))
 				set_file_attrs(fname, file, NULL, fname, 0);
 #endif
 			if (iflags & ITEM_IS_NEW) {

rsync.h

@@ -103,7 +103,7 @@
 /* This is used when working on a new protocol version in CVS, and should
  * be a new non-zero value for each CVS change that affects the protocol.
  * It must ALWAYS be 0 when the protocol goes final (and NEVER before)! */
-#define SUBPROTOCOL_VERSION 12
+#define SUBPROTOCOL_VERSION 13
 
 /* We refuse to interoperate with versions that are not in this range.
  * Note that we assume we'll work with later versions: the onus is on

sender.c

@@ -155,7 +155,8 @@ static void write_ndx_and_attrs(int f_out, int ndx, int iflags,
 	if (iflags & ITEM_XNAME_FOLLOWS)
 		write_vstring(f_out, buf, len);
 #ifdef SUPPORT_XATTRS
-	if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers)
+	if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers
+	 && (protocol_version < 31 || !BITS_SET(iflags, ITEM_XNAME_FOLLOWS|ITEM_LOCAL_CHANGE)))
 		send_xattr_request(fname, file, f_out);
 #endif
 }
@@ -236,7 +237,8 @@ void send_files(int f_in, int f_out)
 			rprintf(FINFO, "send_files(%d, %s%s%s)\n", ndx, path,slash,fname);
 
 #ifdef SUPPORT_XATTRS
-		if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers)
+		if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && do_xfers
+		 && (protocol_version < 31 || !BITS_SET(iflags, ITEM_XNAME_FOLLOWS|ITEM_LOCAL_CHANGE)))
 			recv_xattr_request(file, f_in);
 #endif
 

testsuite/hardlinks.test

@@ -28,7 +28,7 @@ name2="$fromdir/name2"
 name3="$fromdir/name3"
 name4="$fromdir/name4"
 echo "This is the file" > "$name1"
-ln "$name1" "$name2" || fail "Can't create hardlink"
+ln "$name1" "$name2" || test_skipped "Can't create hardlink"
 ln "$name2" "$name3" || fail "Can't create hardlink"
 cp "$name2" "$name4" || fail "Can't copy file"
 cat $srcdir/*.c >"$fromdir/text"

testsuite/xattrs.test

@@ -6,6 +6,7 @@
 # Test that rsync handles basic xattr preservation.
 
 . $suitedir/rsync.fns
+lnkdir="$tmpdir/lnk"
 
 $RSYNC --version | grep ", xattrs" >/dev/null || test_skipped "Rsync is configured without xattr support"
 
@@ -38,7 +39,7 @@ case "`xattr 2>&1`" in
     ;;
 esac
 
-makepath "$fromdir/foo/bar"
+makepath "$lnkdir" "$fromdir/foo/bar"
 echo now >"$fromdir/file0"
 echo something >"$fromdir/file1"
 echo else >"$fromdir/file2"
@@ -73,32 +74,60 @@ xset user.dir1 'need to test directory xattrs too' foo
 xset user.dir2 'another xattr' foo
 xset user.dir3 'this is one last one for the moment' foo
 
+xset user.dir4 'another dir test' foo/bar
+xset user.dir5 'one last one' foo/bar
+
 xset user.foo 'new foo' foo/file3 foo/bar/file5
 xset user.bar 'new bar' foo/file3 foo/bar/file5
 xset user.long 'this is also a long attribute that will be truncated in the initial data send' foo/file3 foo/bar/file5
 xset $RUSR.equal 'this long attribute should remain the same and not need to be transferred' foo/file3 foo/bar/file5
 
+xset user.dir0 'old extra value' "$chkdir/foo"
+xset user.dir1 'old dir value' "$chkdir/foo"
+
 xset user.short 'old short' "$chkdir/file1"
 xset user.extra 'remove me' "$chkdir/file1"
 
 xset user.foo 'old foo' "$chkdir/foo/file3"
 xset $RUSR.equal 'this long attribute should remain the same and not need to be transferred' "$chkdir/foo/file3"
 
+case $0 in
+*hlink*)
+    ln foo/bar/file5 foo/bar/file6 || test_skipped "Can't create hardlink"
+    files="$files foo/bar/file6"
+    dashH='-H'
+    altDest='--link-dest'
+    ;;
+*)
+    dashH=''
+    altDest='--copy-dest'
+    ;;
+esac
+
 xls $dirs $files >"$scratchdir/xattrs.txt"
 
 # OK, let's try a simple xattr copy.
-checkit "$RSYNC -avX --super . '$chkdir/'" "$fromdir" "$chkdir"
+checkit "$RSYNC -avX $dashH --super . '$chkdir/'" "$fromdir" "$chkdir"
 
 cd "$chkdir"
 xls $dirs $files | diff $diffopt "$scratchdir/xattrs.txt" -
 
 cd "$fromdir"
 
-checkit "$RSYNC -aiX --super --copy-dest=../chk . ../to" "$fromdir" "$todir"
+if [ "$dashH" ]; then
+    for fn in $files; do
+	name=`basename $fn`
+	ln $fn ../lnk/$name
+    done
+fi
+
+checkit "$RSYNC -aiX $dashH --super $altDest=../chk . ../to" "$fromdir" "$todir"
 
 cd "$todir"
 xls $dirs $files | diff $diffopt "$scratchdir/xattrs.txt" -
 
+[ "$dashH" ] && rm -rf "$lnkdir"
+
 cd "$fromdir"
 rm -rf "$todir"
 
@@ -106,7 +135,7 @@ xset user.nice 'this is nice, but different' file1
 
 xls $dirs $files >"$scratchdir/xattrs.txt"
 
-checkit "$RSYNC -aiX --fake-super --link-dest=../chk . ../to" "$chkdir" "$todir"
+checkit "$RSYNC -aiX $dashH --fake-super --link-dest=../chk . ../to" "$chkdir" "$todir"
 
 cd "$todir"
 xls $dirs $files | diff $diffopt "$scratchdir/xattrs.txt" -
@@ -136,7 +165,7 @@ cd "$fromdir"
 rm -rf "$todir"
 
 # When run by a non-root tester, this checks if no-user-perm files/dirs can be copied.
-checkit "$RSYNC -aiX --fake-super --chmod=a= . ../to" "$chkdir" "$todir" # 2>"$scratchdir/errors.txt"
+checkit "$RSYNC -aiX $dashH --fake-super --chmod=a= . ../to" "$chkdir" "$todir" # 2>"$scratchdir/errors.txt"
 
 cd "$todir"
 xls $dirs $files | diff $diffopt "$scratchdir/xattrs.txt" -
@@ -148,10 +177,13 @@ $RSYNC -aX file1 file2
 $RSYNC -aX file1 file2 ../chk/
 $RSYNC -aX --del ../chk/ .
 $RSYNC -aX file1 ../lnk/
+[ "$dashH" ] && ln "$chkdir/file1" ../lnk/extra-link
 
 xls file1 file2 >"$scratchdir/xattrs.txt"
 
-checkit "$RSYNC -aiiX --copy-dest=../lnk . ../to" "$chkdir" "$todir"
+checkit "$RSYNC -aiiX $dashH $altDest=../lnk . ../to" "$chkdir" "$todir"
+
+[ "$dashH" ] && rm ../lnk/extra-link
 
 cd "$todir"
 xls file1 file2 | diff $diffopt "$scratchdir/xattrs.txt" -