unfs3: Fix utime for symlink in attr.c

unfs3 has an old defect that it can not change the timestamps of a
symlink file because it only uses utime(), which will follow the
symlink. This will not cause an error if the symlink points to an
existent file but can be triggered with rpm workflows.

Making unfs3 support lutimes() addresses this problem.

(From OE-Core rev: 244a5be0eab31310b8717ab6b713c2902def4e0c)

Signed-off-by: Rui Wang <rui.wang@windriver.com>
Signed-off-by: Joe Slater <joe.slater@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 87 insertions, 1 deletions

diff --git a/meta/recipes-devtools/unfs3/unfs3/0001-attr-fix-utime-for-symlink.patch b/meta/recipes-devtools/unfs3/unfs3/0001-attr-fix-utime-for-symlink.patch
new file mode 100644
index 0000000000..6957d102b8
--- /dev/null
+++ b/meta/recipes-devtools/unfs3/unfs3/0001-attr-fix-utime-for-symlink.patch
@@ -0,0 +1,85 @@
+From 3f4fcb62661059bad77a2e957b4621137797bc2f Mon Sep 17 00:00:00 2001
+From: Rui Wang <rui.wang@windriver.com>
+Date: Fri, 15 Jun 2018 14:19:10 +0800
+Subject: [PATCH] attr: fix utime for symlink
+
+unfs3 has an old defect that it can not change the timestamps of a
+symlink file because it only uses utime(), which will follow the
+symlink. This will not cause an error if the symlink points to an
+existent file. But under some special situation, such as installing
+a rpm package, rpm tool will create the symlink first and try to
+modify the timestamps of it, when the target file is non-existent.
+This will cause an ESTALE error. Making rpm tool ignore this error
+is a solution, but not the best one. An acceptable approach is
+Making unfs3 support lutimes(), which can modify the symlink file
+itself. Considering not every system support this function, so a
+function checking is necessary.
+
+Upstream-Status: Submitted [https://sourceforge.net/p/unfs3/bugs/12/]
+
+Signed-off-by: Rui Wang <rui.wang@windriver.com>
+---
+ attr.c         | 15 +++++++++++----
+ backend_unix.h |  2 ++
+ configure.ac   |  1 +
+ 3 files changed, 14 insertions(+), 4 deletions(-)
+
+diff --git a/attr.c b/attr.c
+index 73e5c75..427d0e2 100644
+--- a/attr.c
++++ b/attr.c
+@@ -280,7 +280,7 @@ post_op_attr get_post_cached(struct svc_req * req)
+ static nfsstat3 set_time(const char *path, backend_statstruct buf, sattr3 new)
+ {
+     time_t new_atime, new_mtime;
+-    struct utimbuf utim;
++    struct timeval stamps[2];
+     int res;
+
+     /* set atime and mtime */
+@@ -302,10 +302,17 @@ static nfsstat3 set_time(const char *path, backend_statstruct buf, sattr3 new)
+	else			       /* DONT_CHANGE */
+	    new_mtime = buf.st_mtime;
+
+-	utim.actime = new_atime;
+-	utim.modtime = new_mtime;
++	stamps[0].tv_sec = new_atime;
++	stamps[0].tv_usec = 0;
++	stamps[1].tv_sec = new_mtime;
++	stamps[1].tv_usec = 0;
++
++#if HAVE_LUTIMES
++	res = backend_lutimes(path, stamps);
++#else
++	res = backend_utimes(path, stamps);
++#endif
+
+-	res = backend_utime(path, &utim);
+	if (res == -1)
+	    return setattr_err();
+     }
+diff --git a/backend_unix.h b/backend_unix.h
+index fbc2af3..813ffd3 100644
+--- a/backend_unix.h
++++ b/backend_unix.h
+@@ -61,6 +61,8 @@
+ #define backend_symlink symlink
+ #define backend_truncate truncate
+ #define backend_utime utime
++#define backend_utimes utimes
++#define backend_lutimes lutimes
+ #define backend_statstruct struct stat
+ #define backend_dirstream DIR
+ #define backend_statvfsstruct struct statvfs
+diff --git a/configure.ac b/configure.ac
+index aeec598..ea7f167 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -37,6 +37,7 @@ AC_CHECK_FUNCS(setresuid setresgid)
+ AC_CHECK_FUNCS(vsyslog)
+ AC_CHECK_FUNCS(lchown)
+ AC_CHECK_FUNCS(setgroups)
++AC_CHECK_FUNCS(lutimes)
+ UNFS3_SOLARIS_RPC
+ UNFS3_PORTMAP_DEFINE
+ UNFS3_COMPILE_WARNINGS
diff --git a/meta/recipes-devtools/unfs3/unfs3_0.9.22.r497.bb b/meta/recipes-devtools/unfs3/unfs3_0.9.22.r497.bb
index 8127e4a10b..5a81a8fdb1 100644
--- a/meta/recipes-devtools/unfs3/unfs3_0.9.22.r497.bb
+++ b/meta/recipes-devtools/unfs3/unfs3_0.9.22.r497.bb
@@ -29,7 +29,8 @@ SRC_URI = "http://downloads.yoctoproject.org/mirror/sources/unfs3-0.9.22.r497.ta
            file://relative_max_socket_path_len.patch \
            file://tcp_no_delay.patch \
            file://0001-daemon.c-Libtirpc-porting-fixes.patch \
-           "
+           file://0001-attr-fix-utime-for-symlink.patch \
+          "
 SRC_URI[md5sum] = "2e43e471c77ade0331901c40b8f8e9a3"
 SRC_URI[sha256sum] = "21009468a9ba07b72ea93780d025a63ab4e55bf8fc3127803c296f0900fe1bac"