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src/t_dir_offset2: Add an option to limit of buffer size

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Will be used to force readdir in several getdents calls.

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 10:14:41 +03:00
committed by Eryu Guan
parent 1c18b9ec2f
commit d8772f925f
1 changed files with 21 additions and 5 deletions
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src/t_dir_offset2.c
+21 -5
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@@ -30,16 +30,32 @@ struct linux_dirent64 {
static uint64_t d_off_history[HISTORY_LEN];
static uint64_t d_ino_history[HISTORY_LEN];
int
main(int argc, char *argv[])
void usage()
{
int fd, nread;
fprintf(stderr, "usage: t_dir_offset2: <dir> [bufsize]\n");
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[])
{
int fd;
char buf[BUF_SIZE];
int nread, bufsize = BUF_SIZE;
struct linux_dirent64 *d;
int bpos, total, i;
off_t lret;
int retval = EXIT_SUCCESS;
if (argc > 2) {
bufsize = atoi(argv[2]);
if (!bufsize)
usage();
if (bufsize > BUF_SIZE)
bufsize = BUF_SIZE;
} else if (argc < 2) {
usage();
}
fd = open(argv[1], O_RDONLY | O_DIRECTORY);
if (fd < 0) {
perror("open");
@@ -48,7 +64,7 @@ main(int argc, char *argv[])
total = 0;
for ( ; ; ) {
nread = syscall(SYS_getdents64, fd, buf, BUF_SIZE);
nread = syscall(SYS_getdents64, fd, buf, bufsize);
if (nread == -1) {
perror("getdents");
exit(EXIT_FAILURE);
@@ -89,7 +105,7 @@ main(int argc, char *argv[])
exit(EXIT_FAILURE);
}
nread = syscall(SYS_getdents64, fd, buf, BUF_SIZE);
nread = syscall(SYS_getdents64, fd, buf, bufsize);
if (nread == -1) {
perror("getdents");
exit(EXIT_FAILURE);