/*
* Returns: 0 = success, < 0 error, 1 not found
*/
int loopcxt_find_by_backing_file(struct loopdev_cxt *lc, const char *filename,
uint64_t offset, int flags)
{
int rc, hasst;
struct stat st;
if (!filename)
return -EINVAL;
hasst = !stat(filename, &st);
rc = loopcxt_init_iterator(lc, LOOPITER_FL_USED);
if (rc)
return rc;
while ((rc = loopcxt_next(lc)) == 0) {
if (loopcxt_is_used(lc, hasst ? &st : NULL,
filename, offset, flags))
break;
}
loopcxt_deinit_iterator(lc);
return rc;
}
/*
* Returns: TRUE/FALSE
*/
int loopdev_is_used(const char *device, const char *filename,
uint64_t offset, int flags)
{
struct loopdev_cxt lc;
struct stat st;
int rc = 0;
if (!device || !filename)
return 0;
loopcxt_init(&lc, 0);
loopcxt_set_device(&lc, device);
rc = !stat(filename, &st);
rc = loopcxt_is_used(&lc, rc ? &st : NULL, filename, offset, flags);
loopcxt_deinit(&lc);
return rc;
}
static int show_all_loops(struct loopdev_cxt *lc, const char *file,
uint64_t offset, int flags)
{
struct stat sbuf, *st = &sbuf;
if (loopcxt_init_iterator(lc, LOOPITER_FL_USED))
return -1;
if (!file || stat(file, st))
st = NULL;
while (loopcxt_next(lc) == 0) {
if (file && !loopcxt_is_used(lc, st, file, offset, flags))
continue;
printf_loopdev(lc);
}
loopcxt_deinit_iterator(lc);
return 0;
}