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23 October 2021, 00:29:24 UTC
Revision b928095b0a7cff7fb9fcf4c706348ceb8ab2c295 authored by Miklos Szeredi on 24 September 2014, 15:56:17 UTC, committed by Al Viro on 27 September 2014, 01:16:42 UTC 
shmem: fix nlink for rename overwrite directory
 
If overwriting an empty directory with rename, then need to drop the extra
nlink.

Test prog:

#include <stdio.h>
#include <fcntl.h>
#include <err.h>
#include <sys/stat.h>

int main(void)
{
	const char *test_dir1 = "test-dir1";
	const char *test_dir2 = "test-dir2";
	int res;
	int fd;
	struct stat statbuf;

	res = mkdir(test_dir1, 0777);
	if (res == -1)
		err(1, "mkdir(\"%s\")", test_dir1);

	res = mkdir(test_dir2, 0777);
	if (res == -1)
		err(1, "mkdir(\"%s\")", test_dir2);

	fd = open(test_dir2, O_RDONLY);
	if (fd == -1)
		err(1, "open(\"%s\")", test_dir2);

	res = rename(test_dir1, test_dir2);
	if (res == -1)
		err(1, "rename(\"%s\", \"%s\")", test_dir1, test_dir2);

	res = fstat(fd, &statbuf);
	if (res == -1)
		err(1, "fstat(%i)", fd);

	if (statbuf.st_nlink != 0) {
		fprintf(stderr, "nlink is %lu, should be 0\n", statbuf.st_nlink);
		return 1;
	}

	return 0;
}

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1 parent 0f33be0
History
Tip revision: b928095b0a7cff7fb9fcf4c706348ceb8ab2c295 authored by Miklos Szeredi on 24 September 2014, 15:56:17 UTC
shmem: fix nlink for rename overwrite directory
Tip revision: b928095
File Mode Size
Makefile -rw-r--r-- 394 bytes
compat.c -rw-r--r-- 19.0 KB
compat_mq.c -rw-r--r-- 3.9 KB
ipc_sysctl.c -rw-r--r-- 7.1 KB
ipcns_notifier.c -rw-r--r-- 2.2 KB
mq_sysctl.c -rw-r--r-- 2.9 KB
mqueue.c -rw-r--r-- 35.3 KB
msg.c -rw-r--r-- 23.9 KB
msgutil.c -rw-r--r-- 3.6 KB
namespace.c -rw-r--r-- 4.7 KB
sem.c -rw-r--r-- 55.0 KB
shm.c -rw-r--r-- 32.3 KB
syscall.c -rw-r--r-- 2.3 KB
util.c -rw-r--r-- 22.3 KB
util.h -rw-r--r-- 6.4 KB
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