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/* seek.c - use glfs_lseek() to find holes in a file
*
* Author: Niels de Vos <ndevos@redhat.com>
*/
/* needed for SEEK_HOLE/SEEK_DATA */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <glusterfs/api/glfs.h>
#include <glusterfs/api/glfs-handles.h>
int
main(int argc, char **argv)
{
glfs_t *fs = NULL;
int ret = 0;
glfs_fd_t *fd = NULL;
char *filename = NULL;
char *volname = NULL;
char *hostname = NULL;
struct stat st = {
0,
};
off_t hole_start = 0;
off_t hole_end = 0;
if (argc != 4) {
fprintf(stderr, "Invalid argument, use %s <hostname> <vol> <file>\n",
argv[0]);
exit(1);
}
hostname = argv[1];
volname = argv[2];
filename = argv[3];
fs = glfs_new(volname);
if (!fs) {
perror("glfs_new() returned NULL");
return 1;
}
if (glfs_set_volfile_server(fs, "tcp", hostname, 24007)) {
perror("glfs_set_volfile_server");
return 1;
}
if (glfs_init(fs)) {
perror("glfs_init");
return 1;
}
fd = glfs_open(fs, filename, O_RDONLY);
if (fd <= 0) {
perror("glfs_open");
return 1;
}
if (glfs_fstat(fd, &st)) {
perror("glfs_fstat");
return 1;
}
while (hole_end < st.st_size) {
hole_start = glfs_lseek(fd, hole_end, SEEK_HOLE);
if (hole_start == -1 && errno == ENXIO)
/* no more holes */
break;
if (hole_start == -1) {
perror("no more holes");
break;
}
hole_end = glfs_lseek(fd, hole_start, SEEK_DATA);
if (hole_end == -1 && errno == ENXIO) {
/* no more data */
break;
}
printf("HOLE found: %ld - %ld%s\n", hole_start, hole_end,
(hole_end == st.st_size) ? " (EOF)" : "");
}
glfs_close(fd);
if (fs) {
glfs_fini(fs);
}
return ret;
}
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