* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2005 by Rob Landley <rob@landley.net>
*
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
#include <linux/version.h>
fd = open(device, O_RDONLY);
if (fd >= 0) {
if (ioctl(fd, BB_LOOP_GET_STATUS, &loopinfo) == 0) {
- dev = xasprintf("%lu %s", (long) loopinfo.lo_offset,
+ dev = xasprintf("%"OFF_FMT"u %s", (off_t) loopinfo.lo_offset,
(char *)loopinfo.lo_file_name);
}
close(fd);
search will re-use an existing loop device already bound to that
file/offset if it finds one.
*/
-int FAST_FUNC set_loop(char **device, const char *file, unsigned long long offset)
+int FAST_FUNC set_loop(char **device, const char *file, unsigned long long offset, int ro)
{
char dev[LOOP_NAMESIZE];
char *try;
int i, dfd, ffd, mode, rc = -1;
/* Open the file. Barf if this doesn't work. */
- mode = O_RDWR;
+ mode = ro ? O_RDONLY : O_RDWR;
ffd = open(file, mode);
if (ffd < 0) {
- mode = O_RDONLY;
- ffd = open(file, mode);
+ if (mode != O_RDONLY) {
+ mode = O_RDONLY;
+ ffd = open(file, mode);
+ }
if (ffd < 0)
return -errno;
}
/* Find a loop device. */
try = *device ? *device : dev;
- for (i = 0; rc && i < 256; i++) {
+ /* 1048575 is a max possible minor number in Linux circa 2010 */
+ for (i = 0; rc && i < 1048576; i++) {
sprintf(dev, LOOP_FORMAT, i);
IF_FEATURE_MOUNT_LOOP_CREATE(errno = 0;)
}
/* If this block device already set up right, re-use it.
- (Yes this is racy, but associating two loop devices with the same
- file isn't pretty either. In general, mounting the same file twice
- without using losetup manually is problematic.)
+ * (Yes this is racy, but associating two loop devices with the same
+ * file isn't pretty either. In general, mounting the same file twice
+ * without using losetup manually is problematic.)
*/
} else
if (strcmp(file, (char *)loopinfo.lo_file_name) != 0