[LTP] [PATCH] truncate03: impose max file size limit for EFBIG test

[Jan Stancek]

Using LLONG_MAX as maximum can fail on XFS, because here the maximum
file size is 2^63-1, so this test may unexpectedly succeed.

Impose limit via setrlimit(RLIMIT_FSIZE,..) and set value used
in EFBIG test to be twice that much.

Signed-off-by: Jan Stancek <jstan...@redhat.com>
---
 testcases/kernel/syscalls/truncate/truncate03.c |   18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/testcases/kernel/syscalls/truncate/truncate03.c 
b/testcases/kernel/syscalls/truncate/truncate03.c
index ed5073d..54b7d3c 100644
--- a/testcases/kernel/syscalls/truncate/truncate03.c
+++ b/testcases/kernel/syscalls/truncate/truncate03.c
@@ -50,6 +50,7 @@
 #include <string.h>
 #include <signal.h>
 #include <pwd.h>
+#include <sys/resource.h>
 
 #include "test.h"
 #include "usctest.h"
@@ -65,6 +66,7 @@
 #define NEW_MODE       S_IRUSR | S_IRGRP | S_IROTH
 #define DIR_MODE       S_IRWXU
 #define TRUNC_LEN      256
+#define MAX_FSIZE      (16*1024*1024)
 
 static char long_pathname[PATH_MAX + 2];
 
@@ -82,7 +84,7 @@ static struct test_case_t {
        { long_pathname, TRUNC_LEN, ENAMETOOLONG },
        { "", TRUNC_LEN, ENOENT },
        { TEST_DIR1, TRUNC_LEN, EISDIR },
-       { TEST_FILE3, LLONG_MAX, EFBIG },
+       { TEST_FILE3, MAX_FSIZE*2, EFBIG },
        { TEST_SYM1, TRUNC_LEN, ELOOP }
 };
 
@@ -124,6 +126,8 @@ void setup(void)
 {
        struct passwd *ltpuser;
        char *bad_addr;
+       struct rlimit rlim;
+       sigset_t sigset;
 
        tst_sig(NOFORK, DEF_HANDLER, cleanup);
 
@@ -156,6 +160,18 @@ void setup(void)
 
        SAFE_SYMLINK(cleanup, TEST_SYM1, TEST_SYM2);
        SAFE_SYMLINK(cleanup, TEST_SYM2, TEST_SYM1);
+
+       rlim.rlim_cur = MAX_FSIZE;
+       rlim.rlim_max = MAX_FSIZE;
+       TEST(setrlimit(RLIMIT_FSIZE, &rlim));
+       if (TEST_RETURN != 0)
+               tst_brkm(TBROK | TTERRNO, cleanup, "setrlimit");
+
+       sigemptyset(&sigset);
+       sigaddset(&sigset, SIGXFSZ);
+       TEST(sigprocmask(SIG_BLOCK, &sigset, NULL));
+       if (TEST_RETURN != 0)
+               tst_brkm(TBROK | TTERRNO, cleanup, "sigprocmask");
 }
 
 void truncate_verify(struct test_case_t *tc)
-- 
1.7.1


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