* tests shared mount: shared mount can be replicated to as many mountpoints and all the replicas continue to be exactly same.
Signed-off-by: Matus Marhefka <mmarh...@redhat.com> --- runtest/containers | 2 + testcases/kernel/containers/.gitignore | 1 + testcases/kernel/containers/mountns/Makefile | 23 +++ testcases/kernel/containers/mountns/mountns01.c | 156 +++++++++++++++++++++ .../kernel/containers/mountns/mountns_helper.h | 39 ++++++ 5 files changed, 221 insertions(+) create mode 100644 testcases/kernel/containers/mountns/Makefile create mode 100644 testcases/kernel/containers/mountns/mountns01.c create mode 100644 testcases/kernel/containers/mountns/mountns_helper.h diff --git a/runtest/containers b/runtest/containers index 558d7eb..f298c7e 100644 --- a/runtest/containers +++ b/runtest/containers @@ -55,3 +55,5 @@ utstest_clone_2 utstest clone 2 utstest_clone_3 utstest clone 3 utstest_clone_4 utstest clone 4 utstest_clone_5 utstest clone 5 + +mountns01 mountns01 diff --git a/testcases/kernel/containers/.gitignore b/testcases/kernel/containers/.gitignore index f6f5b14..254d1b9 100644 --- a/testcases/kernel/containers/.gitignore +++ b/testcases/kernel/containers/.gitignore @@ -1 +1,2 @@ /check_for_unshare +mountns/mountns01 diff --git a/testcases/kernel/containers/mountns/Makefile b/testcases/kernel/containers/mountns/Makefile new file mode 100644 index 0000000..f9b6b99 --- /dev/null +++ b/testcases/kernel/containers/mountns/Makefile @@ -0,0 +1,23 @@ +# Copyright (c) 2014 Red Hat, Inc. +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of version 2 the GNU General Public License as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. +############################################################################## + +top_srcdir ?= ../../../.. + +include $(top_srcdir)/include/mk/testcases.mk +include $(abs_srcdir)/../Makefile.inc + +LDLIBS := -lclone -lltp + +include $(top_srcdir)/include/mk/generic_leaf_target.mk diff --git a/testcases/kernel/containers/mountns/mountns01.c b/testcases/kernel/containers/mountns/mountns01.c new file mode 100644 index 0000000..93600f4 --- /dev/null +++ b/testcases/kernel/containers/mountns/mountns01.c @@ -0,0 +1,156 @@ +/* Copyright (c) 2014 Red Hat, Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of version 2 the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + *********************************************************************** + * File: mountns01.c + * + * Tests a shared mount: shared mount can be replicated to as many + * mountpoints and all the replicas continue to be exactly same. + * Description: + * 1. Creates directories "A", "B" and files "A/A", "B/B" + * 2. Unshares mount namespace and makes it private (so mounts/umounts + * have no effect on a real system) + * 3. Bind mounts directory "A" to "A" and "B" to "B" + * 4. Makes both directories ("A" and "B") shared + * 5. Clones a new child process with CLONE_NEWNS flag - the new child + * then bind mounts directory "B" to "A" + * 6. Parent then checks if directory "A" contains the file "B" + * (changes in child should be visible in parent as mounts were + * shared): + * - if it does, test passes + * - if it doesn't, test fails + ***********************************************************************/ + +#define _GNU_SOURCE +#include <sys/wait.h> +#include <sys/mount.h> +#include <stdio.h> +#include <errno.h> +#include "test.h" +#include "usctest.h" +#include "libclone.h" +#include "safe_macros.h" +#include "safe_file_ops.h" +#include "mountns_helper.h" + + +#define DIRA "A" +#define DIRB "B" +char *TCID = "mountns01"; +int TST_TOTAL = 1; + + +/* checks if following mountflags are defined */ +#if defined(MS_SHARED) && defined(MS_PRIVATE) && defined(MS_REC) + +static void cleanup(void) +{ + umount(DIRA); + umount(DIRA); + umount(DIRB); + tst_rmdir(); +} + +static void setup(void) +{ + tst_require_root(NULL); + check_newns(); /* from mountns_helper.h */ + tst_tmpdir(); + SAFE_MKDIR(cleanup, DIRA, 0777); + SAFE_MKDIR(cleanup, DIRB, 0777); + SAFE_TOUCH(cleanup, DIRA"/A", 0, NULL); + SAFE_TOUCH(cleanup, DIRB"/B", 0, NULL); +} + +int child_func(void *arg) +{ + /* bind mounts DIRB to DIRA making contents of DIRB visible + * in DIRA */ + if (mount(DIRB, DIRA, "none", MS_BIND, NULL) == -1) { + perror("mount"); + return 1; + } + return 0; +} + +static void test(void) +{ + int status; + + /* unshares the mount ns */ + if (unshare(CLONE_NEWNS) == -1) + tst_brkm(TBROK | TERRNO, cleanup, "unshare failed"); + /* makes sure parent mounts/umounts have no effect on a real system */ + SAFE_MOUNT(cleanup, "none", "/", "none", MS_REC|MS_PRIVATE, NULL); + + /* bind mounts DIRA to itself */ + SAFE_MOUNT(cleanup, DIRA, DIRA, "none", MS_BIND, NULL); + /* bind mounts DIRB to itself */ + SAFE_MOUNT(cleanup, DIRB, DIRB, "none", MS_BIND, NULL); + + /* makes mount DIRA shared */ + SAFE_MOUNT(cleanup, "none", DIRA, "none", MS_SHARED, NULL); + /* makes mount DIRB shared */ + SAFE_MOUNT(cleanup, "none", DIRB, "none", MS_SHARED, NULL); + + + if (do_clone_tests(CLONE_NEWNS, child_func, NULL, NULL, NULL) == -1) + tst_brkm(TBROK | TERRNO, cleanup, "clone failed"); + + SAFE_WAIT(cleanup, &status); + + if (WIFEXITED(status) && WEXITSTATUS(status) != 0) + tst_brkm(TBROK, cleanup, "mount (in child) failed"); + + if (WIFSIGNALED(status)) { + tst_resm(TFAIL, "child was killed with signal %s", + tst_strsig(WTERMSIG(status))); + return; + } + + /* as child shared mounts with parent, parent should also + * see file "B" in DIRA; following checks if DIRA contains file "B" */ + if (access(DIRA"/B", F_OK) != -1) + tst_resm(TPASS, "share mount passed"); + else + tst_resm(TFAIL, "share mount failed"); + + SAFE_UMOUNT(cleanup, DIRA); + SAFE_UMOUNT(cleanup, DIRA); + SAFE_UMOUNT(cleanup, DIRB); +} + +int main(int argc, char *argv[]) +{ + const char *msg; + int lc; + + msg = parse_opts(argc, argv, NULL, NULL); + if (msg != NULL) + tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); + + setup(); + + for (lc = 0; TEST_LOOPING(lc); lc++) + test(); + + cleanup(); + tst_exit(); +} + +#else /* MS_SHARED && MS_PRIVATE && MS_REC */ +int main(void) +{ + tst_brkm(TCONF, NULL, "needed mountflags are not defined"); +} +#endif diff --git a/testcases/kernel/containers/mountns/mountns_helper.h b/testcases/kernel/containers/mountns/mountns_helper.h new file mode 100644 index 0000000..e305028 --- /dev/null +++ b/testcases/kernel/containers/mountns/mountns_helper.h @@ -0,0 +1,39 @@ +/* Copyright (c) 2014 Red Hat, Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of version 2 the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include "libclone.h" +#include "test.h" +#include "safe_macros.h" + +static int dummy_child(void *v) +{ + (void) v; + return 0; +} + +static int check_newns(void) +{ + int pid, status; + + if (tst_kvercmp(2, 4, 19) < 0) + tst_brkm(TCONF, NULL, "CLONE_NEWNS not supported"); + + pid = do_clone_unshare_test(T_CLONE, CLONE_NEWNS, dummy_child, NULL); + if (pid == -1) + tst_brkm(TCONF | TERRNO, NULL, "CLONE_NEWNS not supported"); + SAFE_WAIT(NULL, &status); + + return 0; +} -- 1.8.3.1 ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. 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