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src/t_dir_offset2: Add option to create or unlink file

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Will be used to test missing/stale entries after modifications to
an open dirfd.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Amir Goldstein
2021-04-25 10:14:43 +03:00
committed by Eryu Guan
parent 2c1329d636
commit 54494f02ef
1 changed files with 53 additions and 3 deletions
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src/t_dir_offset2.c
+53 -3
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@@ -34,13 +34,13 @@ static uint64_t d_ino_history[HISTORY_LEN];
void usage()
{
fprintf(stderr, "usage: t_dir_offset2: <dir> [[bufsize] <filename> [-v]]\n");
fprintf(stderr, "usage: t_dir_offset2: <dir> [[bufsize] [-|+]<filename> [-v]]\n");
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[])
{
int fd;
int fd, fd2 = -1;
char buf[BUF_SIZE];
int nread, bufsize = BUF_SIZE;
struct linux_dirent64 *d;
@@ -49,7 +49,7 @@ int main(int argc, char *argv[])
int retval = EXIT_SUCCESS;
const char *filename = NULL;
int exists = 0, found = 0;
int verbose = 0;
int modify = 0, verbose = 0;
if (argc > 2) {
bufsize = atoi(argv[2]);
@@ -60,6 +60,13 @@ int main(int argc, char *argv[])
if (argc > 3) {
filename = argv[3];
/* +<filename> creates, -<filename> removes */
if (filename[0] == '+')
modify = 1;
else if (filename[0] == '-')
modify = -1;
if (modify)
filename++;
if (argc > 4 && !strcmp(argv[4], "-v"))
verbose = 1;
}
@@ -89,6 +96,49 @@ int main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
if (modify && fd2 < 0 && total == 0) {
printf("getdents at offset 0 returned %d bytes\n", nread);
/* create/unlink entry after first getdents */
if (modify > 0) {
if (openat(fd, filename, O_CREAT, 0600) < 0) {
perror("openat");
exit(EXIT_FAILURE);
}
exists = 1;
printf("created entry %s\n", filename);
} else if (modify < 0) {
if (unlinkat(fd, filename, 0) < 0) {
perror("unlinkat");
exit(EXIT_FAILURE);
}
exists = 0;
printf("unlinked entry %s\n", filename);
}
/*
* Old fd may not return new entry and may return stale
* entries which is allowed. Keep old fd open and open
* a new fd to check for stale or missing entries later.
*/
fd2 = open(argv[1], O_RDONLY | O_DIRECTORY);
if (fd2 < 0) {
perror("open fd2");
exit(EXIT_FAILURE);
}
}
if (nread == 0) {
if (fd2 < 0 || fd == fd2)
break;
/* Re-iterate with new fd leaving old fd open */
fd = fd2;
total = 0;
found = 0;
continue;
}
if (nread == 0)
break;