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      1 /*
      2  * Copyright (c) 2013 Fujitsu Ltd.
      3  * Author: DAN LI <li.dan (at) cn.fujitsu.com>
      4  *
      5  * This program is free software; you can redistribute it and/or modify it
      6  * under the terms of version 2 of the GNU General Public License as
      7  * published by the Free Software Foundation.
      8  *
      9  * This program is distributed in the hope that it would be useful, but
     10  * WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
     12  *
     13  * You should have received a copy of the GNU General Public License along
     14  * with this program; if not, write the Free Software Foundation, Inc.,
     15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
     16  *
     17  */
     18 
     19 /*
     20  *  DESCRIPTION
     21  *	Test for feature MS_BIND of mount.
     22  *	"Perform a bind mount, making a file or a directory subtree visible
     23  *	 at another point within a file system."
     24  */
     25 
     26 #include <errno.h>
     27 #include <sys/mount.h>
     28 #include <sys/types.h>
     29 #include <sys/stat.h>
     30 #include <unistd.h>
     31 #include <fcntl.h>
     32 
     33 #include "test.h"
     34 #include "safe_macros.h"
     35 
     36 static void help(void);
     37 static void setup(void);
     38 static void cleanup(void);
     39 
     40 char *TCID = "mount05";
     41 int TST_TOTAL = 1;
     42 
     43 #define DIR_MODE	(S_IRWXU | S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP)
     44 
     45 static int dflag;
     46 static char *fstype = "ext2";
     47 static char *device;
     48 static const char file_src[] = "mnt_src/tstfile";
     49 static const char file_des[] = "mnt_des/tstfile";
     50 static const char mntpoint_src[] = "mnt_src";
     51 static const char mntpoint_des[] = "mnt_des";
     52 
     53 static option_t options[] = {
     54 	{"T:", NULL, &fstype},
     55 	{"D:", &dflag, &device},
     56 	{NULL, NULL, NULL},
     57 };
     58 
     59 int main(int argc, char *argv[])
     60 {
     61 	int lc;
     62 
     63 	tst_parse_opts(argc, argv, options, &help);
     64 
     65 	setup();
     66 
     67 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     68 
     69 		tst_count = 0;
     70 
     71 		TEST(mount(mntpoint_src, mntpoint_des, fstype, MS_BIND, NULL));
     72 
     73 		if (TEST_RETURN != 0) {
     74 			tst_resm(TFAIL | TTERRNO, "mount(2) failed");
     75 		} else {
     76 
     77 			if (open(file_des, O_CREAT | O_EXCL, S_IRWXU) == -1 &&
     78 			    errno == EEXIST)
     79 				tst_resm(TPASS, "bind mount is ok");
     80 			else
     81 				tst_resm(TFAIL, "file %s is not available",
     82 					 file_des);
     83 
     84 			TEST(tst_umount(mntpoint_des));
     85 			if (TEST_RETURN != 0)
     86 				tst_brkm(TBROK | TTERRNO, cleanup,
     87 					 "umount(2) failed");
     88 		}
     89 	}
     90 
     91 	cleanup();
     92 	tst_exit();
     93 }
     94 
     95 void setup(void)
     96 {
     97 	tst_require_root();
     98 
     99 	tst_sig(NOFORK, DEF_HANDLER, cleanup);
    100 
    101 	tst_tmpdir();
    102 
    103 	SAFE_MKDIR(cleanup, mntpoint_src, DIR_MODE);
    104 	SAFE_MKDIR(cleanup, mntpoint_des, DIR_MODE);
    105 
    106 	if (dflag) {
    107 		tst_mkfs(NULL, device, fstype, NULL, NULL);
    108 
    109 		if (mount(device, mntpoint_src, fstype, 0, NULL) == -1)
    110 			tst_brkm(TBROK | TERRNO, cleanup, "mount failed");
    111 	}
    112 
    113 	SAFE_FILE_PRINTF(cleanup, file_src, "TEST FILE");
    114 
    115 	TEST_PAUSE;
    116 }
    117 
    118 void cleanup(void)
    119 {
    120 	if (dflag)
    121 		if (tst_umount(mntpoint_src) != 0)
    122 			tst_brkm(TBROK | TTERRNO, NULL, "umount(2) failed");
    123 
    124 	tst_rmdir();
    125 }
    126 
    127 void help(void)
    128 {
    129 	printf("-T type	  : specifies the type of filesystem to be mounted. "
    130 	       "Default ext2.\n");
    131 	printf("-D device : device used for mounting.\n");
    132 }
    133