[LTP] [PATCH v2] syscalls/fsetxattr02.c: Fix the failure of opening device files

[Xiao Yang]

If temporary directory(TMPDIR/TEMPDIR) is on the mountpoint which
is mounted with nodev option or temporary directory is mounted with
with nodev option directly(e.g. tmpfs is mounted on /tmp), open(2)
has no permission to open device files in the temporary directory
and returns EACCES.  as below:
--------------------------------------------------------------------
safe_macros.c:225: BROK: fsetxattr02.c:215: open(fsetxattr02chr,0,00) failed: EACCES
--------------------------------------------------------------------

We try to fix this issue by creating device files in /dev/ instead.

This is the same issue reported by open11, please see the mail:
http://lists.linux.it/pipermail/ltp/2018-July/008641.html

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>

Changes in v2:
Acquire basename to avoid breaking OFFSET logic.
---
 testcases/kernel/syscalls/fsetxattr/fsetxattr02.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/testcases/kernel/syscalls/fsetxattr/fsetxattr02.c b/testcases/kernel/syscalls/fsetxattr/fsetxattr02.c
index a1be652..13e1735 100644
--- a/testcases/kernel/syscalls/fsetxattr/fsetxattr02.c
+++ b/testcases/kernel/syscalls/fsetxattr/fsetxattr02.c
@@ -52,11 +52,13 @@
 #define FILENAME "fsetxattr02testfile"
 #define DIRNAME  "fsetxattr02testdir"
 #define SYMLINK  "fsetxattr02symlink"
-#define FIFO     "fsetxattr02fifo"
-#define CHR      "fsetxattr02chr"
-#define BLK      "fsetxattr02blk"
+#define FIFO     "/dev/fsetxattr02fifo"
+#define CHR      "/dev/fsetxattr02chr"
+#define BLK      "/dev/fsetxattr02blk"
 #define SOCK     "fsetxattr02sock"
 
+static char *dev_files[3] = {FIFO, CHR, BLK};
+
 struct test_case {
 	char *fname;
 	int fd;
@@ -139,6 +141,9 @@ static struct test_case tc[] = {
 
 static void verify_fsetxattr(unsigned int i)
 {
+	/* acquire basename to avoid breaking OFFSET logic*/
+	tc[i].fname = strstr(tc[i].fname, "fsetxattr02");
+
 	/* some tests might require existing keys for each iteration */
 	if (tc[i].needskeyset) {
 		SAFE_FSETXATTR(tc[i].fd, tc[i].key, tc[i].value, tc[i].size,
@@ -240,6 +245,11 @@ static void cleanup(void)
 		if (tc[i].fd > 0)
 			SAFE_CLOSE(tc[i].fd);
 	}
+
+	for (i = 0; i < ARRAY_SIZE(dev_files); i++) {
+		if (!access(dev_files[i], F_OK))
+			SAFE_UNLINK(dev_files[i]);
+	}
 }
 
 static struct tst_test test = {
-- 
1.8.3.1