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      1 /*
      2  * Copyright (c) 2015 Cedric Hnyda <chnyda (at) suse.com>
      3  *
      4  * This program is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU General Public License as
      6  * published by the Free Software Foundation; either version 2 of
      7  * the License, or (at your option) any later version.
      8  *
      9  * This program is distributed in the hope that it would be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     12  * GNU General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU General Public License
     15  * along with this program; if not, write the Free Software Foundation,
     16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     17  */
     18 
     19  /* Description:
     20  *   Calls renameat2(2) with the flag RENAME_EXCHANGE and check that
     21  *   the content was swapped
     22  */
     23 
     24 #define _GNU_SOURCE
     25 
     26 #include "test.h"
     27 #include "safe_macros.h"
     28 #include "lapi/fcntl.h"
     29 #include "renameat2.h"
     30 
     31 #define TEST_DIR "test_dir/"
     32 #define TEST_DIR2 "test_dir2/"
     33 
     34 #define TEST_FILE "test_file"
     35 #define TEST_FILE2 "test_file2"
     36 
     37 char *TCID = "renameat202";
     38 
     39 static int olddirfd;
     40 static int newdirfd;
     41 static int fd = -1;
     42 static int cnt;
     43 
     44 static const char content[] = "content";
     45 static long fs_type;
     46 
     47 
     48 int TST_TOTAL = 1;
     49 
     50 static void setup(void);
     51 static void cleanup(void);
     52 static void renameat2_verify(void);
     53 
     54 
     55 int main(int ac, char **av)
     56 {
     57 	int lc;
     58 
     59 	tst_parse_opts(ac, av, NULL, NULL);
     60 
     61 	setup();
     62 
     63 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     64 
     65 		tst_count = 0;
     66 
     67 		TEST(renameat2(olddirfd, TEST_FILE,
     68 				newdirfd, TEST_FILE2, RENAME_EXCHANGE));
     69 
     70 		cnt++;
     71 
     72 		renameat2_verify();
     73 	}
     74 
     75 	cleanup();
     76 	tst_exit();
     77 }
     78 
     79 static void setup(void)
     80 {
     81 	if ((tst_kvercmp(3, 15, 0)) < 0) {
     82 		tst_brkm(TCONF, NULL,
     83 			"This test can only run on kernels that are 3.15. and higher");
     84 	}
     85 
     86 	tst_tmpdir();
     87 
     88 	fs_type = tst_fs_type(cleanup, ".");
     89 
     90 	SAFE_MKDIR(cleanup, TEST_DIR, 0700);
     91 	SAFE_MKDIR(cleanup, TEST_DIR2, 0700);
     92 
     93 	SAFE_TOUCH(cleanup, TEST_DIR TEST_FILE, 0600, NULL);
     94 	SAFE_TOUCH(cleanup, TEST_DIR2 TEST_FILE2, 0600, NULL);
     95 
     96 	olddirfd = SAFE_OPEN(cleanup, TEST_DIR, O_DIRECTORY);
     97 	newdirfd = SAFE_OPEN(cleanup, TEST_DIR2, O_DIRECTORY);
     98 
     99 	SAFE_FILE_PRINTF(cleanup, TEST_DIR TEST_FILE, "%s", content);
    100 
    101 }
    102 
    103 static void cleanup(void)
    104 {
    105 	if (olddirfd > 0 && close(olddirfd) < 0)
    106 		tst_resm(TWARN | TERRNO, "close olddirfd failed");
    107 
    108 	if (newdirfd > 0 && close(newdirfd) < 0)
    109 		tst_resm(TWARN | TERRNO, "close newdirfd failed");
    110 
    111 	if (fd > 0 && close(fd) < 0)
    112 		tst_resm(TWARN | TERRNO, "close fd failed");
    113 
    114 	tst_rmdir();
    115 
    116 }
    117 
    118 static void renameat2_verify(void)
    119 {
    120 	char str[BUFSIZ] = { 0 };
    121 	struct stat st;
    122 	char *emptyfile;
    123 	char *contentfile;
    124 	int readn, data_len;
    125 
    126 	if (TEST_ERRNO == EINVAL && TST_BTRFS_MAGIC == fs_type) {
    127 		tst_brkm(TCONF, cleanup,
    128 			"RENAME_EXCHANGE flag is not implemeted on %s",
    129 			tst_fs_type_name(fs_type));
    130 	}
    131 
    132 	if (TEST_RETURN != 0) {
    133 		tst_resm(TFAIL | TTERRNO, "renameat2() failed unexpectedly");
    134 		return;
    135 	}
    136 
    137 	if (cnt % 2 == 1) {
    138 		emptyfile = TEST_DIR TEST_FILE;
    139 		contentfile = TEST_DIR2 TEST_FILE2;
    140 	} else {
    141 		emptyfile = TEST_DIR2 TEST_FILE2;
    142 		contentfile = TEST_DIR TEST_FILE;
    143 	}
    144 
    145 	fd = SAFE_OPEN(cleanup, contentfile, O_RDONLY);
    146 
    147 	SAFE_STAT(cleanup, emptyfile, &st);
    148 
    149 	readn = SAFE_READ(cleanup, 0, fd, str, BUFSIZ);
    150 
    151 	if (close(fd) < 0)
    152 		tst_brkm(TERRNO | TFAIL, cleanup, "close fd failed");
    153 	fd = 0;
    154 
    155 	data_len = sizeof(content) - 1;
    156 	if (readn != data_len) {
    157 		tst_resm(TFAIL, "Wrong number of bytes read after renameat2(). "
    158 				"Expect %d, got %d", data_len, readn);
    159 		return;
    160 	}
    161 	if (strncmp(content, str, data_len)) {
    162 		tst_resm(TFAIL, "File content changed after renameat2(). "
    163 				"Expect '%s', got '%s'", content, str);
    164 		return;
    165 	}
    166 	if (st.st_size) {
    167 		tst_resm(TFAIL, "emptyfile has non-zero file size");
    168 		return;
    169 	}
    170 	tst_resm(TPASS, "renameat2() test passed");
    171 }
    172