[LTP] [PATCH]Fix bug of hugemmap

[Bian Naimeng <biannm@cn.fujitsu.com>]

Man pages of mmap said: 

  Use of a mapped region can result in these signals:
    SIGSEGV
       Attempted write into a region mapped as read-only.
    SIGBUS
       Attempted access to a portion of the buffer that does not correspond to the
       file (for example, beyond the end of the  file,  including  the  case where
       another process has truncated the file).

So we should make sure the size of file is not zero, otherwise test will fail
when write to the mapped region.

Signed-off-by: Bian Naimeng <biannm@cn.fujitsu.com>

---
 testcases/kernel/mem/hugetlb/hugemmap/hugemmap01.c |   11 +++++++++--
 testcases/kernel/mem/hugetlb/hugemmap/hugemmap04.c |   11 +++++++++--
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap01.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap01.c
index 3676f1b..33b3ade 100644
--- a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap01.c
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap01.c
@@ -73,7 +73,8 @@
 #include "test.h"
 #include "usctest.h"
 
-#define BUFFER_SIZE  256
+#define BUFFER_SIZE	256
+#define FILE_SIZE	1024
 
 char* TEMPFILE="mmapfile";
 
@@ -129,12 +130,18 @@ main(int ac, char **av)
 	/* Check looping state if -i option given */
 	for (lc = 0; TEST_LOOPING(lc); lc++) {
 
-	        /* Creat a temporary file used for mapping */
+	        /* Creat a temporary file used for mapping,and truncate it */
 		if ((fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0666)) < 0) {
 			tst_brkm(TFAIL, cleanup,
 				 "open() on %s Failed, errno=%d : %s",
 				 TEMPFILE, errno, strerror(errno));
 		}
+		if (ftruncate(fildes, FILE_SIZE) < 0) {
+			close(fildes);
+			tst_brkm(TFAIL, cleanup,
+				 "ftruncate() on %s Failed, errno=%d : %s",
+				 TEMPFILE, errno, strerror(errno));
+		}
 		/* Reset Tst_count in case we are looping. */
 		Tst_count=0;
 
diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap04.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap04.c
index c3b7af2..02d7e9f 100644
--- a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap04.c
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap04.c
@@ -74,7 +74,8 @@
 #include "usctest.h"
 #include "system_specific_hugepages_info.h"
 
-#define BUFFER_SIZE  256
+#define BUFFER_SIZE	256
+#define FILE_SIZE	1024
 
 char* TEMPFILE="mmapfile";
 
@@ -135,12 +136,18 @@ main(int ac, char **av)
 	/* Check looping state if -i option given */
 	for (lc = 0; TEST_LOOPING(lc); lc++) {
 
-	        /* Creat a temporary file used for mapping */
+	        /* Creat a temporary file used for mapping, and truncate it */
 		if ((fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0666)) < 0) {
 			tst_brkm(TFAIL, cleanup,
 				 "open() on %s Failed, errno=%d : %s",
 				 TEMPFILE, errno, strerror(errno));
 		}
+		if (ftruncate(fildes, FILE_SIZE) < 0) {
+			close(fildes);
+			tst_brkm(TFAIL, cleanup,
+				 "ftruncate() on %s Failed, errno=%d : %s",
+				 TEMPFILE, errno, strerror(errno));
+		}
 		/* Reset Tst_count in case we are looping. */
 		Tst_count=0;
 
-- 
1.7.0.4



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