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-rw-r--r--util-linux/losetup.c37
1 files changed, 21 insertions, 16 deletions
diff --git a/util-linux/losetup.c b/util-linux/losetup.c
index c69763335..d450b5a78 100644
--- a/util-linux/losetup.c
+++ b/util-linux/losetup.c
@@ -10,12 +10,12 @@
//usage:#define losetup_trivial_usage
//usage: "[-r] [-o OFS] {-f|LOOPDEV} FILE - associate loop devices\n"
//usage: " losetup -d LOOPDEV - disassociate\n"
-//usage: " losetup -a - show status of all\n"
-//usage: " losetup -f - show next available"
+//usage: " losetup -a - show status\n"
+//usage: " losetup -f - show next free loop device"
//usage:#define losetup_full_usage "\n\n"
//usage: " -o OFS Start OFS bytes into FILE"
//usage: "\n -r Read-only"
-//usage: "\n -f Show/find first free loop device"
+//usage: "\n -f Show/use next free loop device"
//usage:
//usage:#define losetup_notes_usage
//usage: "One argument (losetup /dev/loop1) will display the current association\n"
@@ -27,6 +27,10 @@
#include "libbb.h"
+/* 1048575 is a max possible minor number in Linux circa 2010 */
+/* for now use something less extreme */
+#define MAX_LOOP_NUM 1023
+
int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int losetup_main(int argc UNUSED_PARAM, char **argv)
{
@@ -59,7 +63,7 @@ int losetup_main(int argc UNUSED_PARAM, char **argv)
}
/* -d LOOPDEV */
- if (opt == OPT_d) {
+ if (opt == OPT_d && argv[0]) {
if (del_loop(argv[0]))
bb_simple_perror_msg_and_die(argv[0]);
return EXIT_SUCCESS;
@@ -68,15 +72,14 @@ int losetup_main(int argc UNUSED_PARAM, char **argv)
/* -a */
if (opt == OPT_a) {
int n;
- for (n = 0; n < 10; n++) {
+ for (n = 0; n < MAX_LOOP_NUM; n++) {
char *s;
sprintf(dev, LOOP_FORMAT, n);
s = query_loop(dev);
if (s) {
printf("%s: %s\n", dev, s);
- if (ENABLE_FEATURE_CLEAN_UP)
- free(s);
+ free(s);
}
}
return EXIT_SUCCESS;
@@ -88,11 +91,13 @@ int losetup_main(int argc UNUSED_PARAM, char **argv)
int n = 0;
do {
- sprintf(dev, LOOP_FORMAT, n);
+ if (n > MAX_LOOP_NUM)
+ bb_error_msg_and_die("no free loop devices");
+ sprintf(dev, LOOP_FORMAT, n++);
s = query_loop(dev);
- if (s && ENABLE_FEATURE_CLEAN_UP)
- free(s);
+ free(s);
} while (s);
+ /* now: dev is next free "/dev/loopN" */
if ((opt == OPT_f) && !argv[0]) {
puts(dev);
return EXIT_SUCCESS;
@@ -104,18 +109,18 @@ int losetup_main(int argc UNUSED_PARAM, char **argv)
unsigned long long offset = 0;
char *d = dev;
- if (opt == OPT_o)
+ if (opt & OPT_o)
offset = xatoull(opt_o);
- if (opt != OPT_f)
- d = *(argv++);
+ if (!(opt & OPT_f))
+ d = *argv++;
if (argv[0]) {
- if (set_loop(&d, argv[0], offset, (opt / OPT_r)) < 0)
+ if (set_loop(&d, argv[0], offset, (opt & OPT_r)) < 0)
bb_simple_perror_msg_and_die(argv[0]);
return EXIT_SUCCESS;
}
}
- bb_show_usage();
- return EXIT_FAILURE;
+ bb_show_usage(); /* does not return */
+ /*return EXIT_FAILURE;*/
}