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      1 /*
      2  * Copyright (c) Wipro Technologies Ltd, 2002.  All Rights Reserved.
      3  * Copyright (c) 2014 Cyril Hrubis <chrubis (at) suse.cz>
      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  *    AUTHOR		: Nirmala Devi Dhanasekar <nirmala.devi (at) wipro.com>
     18  *
     19  *    DESCRIPTION
     20  *	Check for basic errors returned by umount(2) system call.
     21  *
     22  *	Verify that umount(2) returns -1 and sets errno to
     23  *
     24  *	1) EBUSY if it cannot be umounted, because dir is still busy.
     25  *	2) EFAULT if specialfile or device file points to invalid address space.
     26  *	3) ENOENT if pathname was empty or has a nonexistent component.
     27  *	4) EINVAL if specialfile or device is invalid or not a mount point.
     28  *	5) ENAMETOOLONG if pathname was longer than MAXPATHLEN.
     29  *****************************************************************************/
     30 
     31 #include <errno.h>
     32 #include <string.h>
     33 #include <sys/mount.h>
     34 #include "tst_test.h"
     35 
     36 #define MNTPOINT	"mntpoint"
     37 
     38 static char long_path[PATH_MAX + 2];
     39 static int mount_flag;
     40 static int fd;
     41 
     42 static struct tcase {
     43 	const char *err_desc;
     44 	const char *mntpoint;
     45 	int exp_errno;
     46 } tcases[] = {
     47 	{"Already mounted/busy", MNTPOINT, EBUSY},
     48 	{"Invalid address", NULL, EFAULT},
     49 	{"Directory not found", "nonexistent", ENOENT},
     50 	{"Invalid  device", "./", EINVAL},
     51 	{"Pathname too long", long_path, ENAMETOOLONG}
     52 };
     53 
     54 static void verify_umount(unsigned int n)
     55 {
     56 	struct tcase *tc = &tcases[n];
     57 
     58 	TEST(umount(tc->mntpoint));
     59 
     60 	if (TEST_RETURN != -1) {
     61 		tst_res(TFAIL, "umount() succeeds unexpectedly");
     62 		return;
     63 	}
     64 
     65 	if (tc->exp_errno != TEST_ERRNO) {
     66 		tst_res(TFAIL | TTERRNO, "umount() should fail with %s",
     67 			tst_strerrno(tc->exp_errno));
     68 		return;
     69 	}
     70 
     71 	tst_res(TPASS | TTERRNO, "umount() fails as expected: %s",
     72 		tc->err_desc);
     73 }
     74 
     75 static void setup(void)
     76 {
     77 	memset(long_path, 'a', PATH_MAX + 1);
     78 
     79 	SAFE_MKDIR(MNTPOINT, 0775);
     80 	SAFE_MOUNT(tst_device->dev, MNTPOINT, tst_device->fs_type, 0, NULL);
     81 	mount_flag = 1;
     82 
     83 	fd = SAFE_CREAT(MNTPOINT "/file", 0777);
     84 }
     85 
     86 static void cleanup(void)
     87 {
     88 	if (fd > 0)
     89 		SAFE_CLOSE(fd);
     90 
     91 	if (mount_flag)
     92 		tst_umount(MNTPOINT);
     93 }
     94 
     95 static struct tst_test test = {
     96 	.tcnt = ARRAY_SIZE(tcases),
     97 	.needs_root = 1,
     98 	.needs_tmpdir = 1,
     99 	.format_device = 1,
    100 	.setup = setup,
    101 	.cleanup = cleanup,
    102 	.test = verify_umount,
    103 };
    104