losetup: new -D option to delete all used loop devices

Signed-off-by: Petr Uzel <petr.uzel@suse.cz>
Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 41 insertions, 4 deletions

diff --git a/mount/lomount.c b/mount/lomount.c
index 441860b71..2ce30abb0 100644
--- a/mount/lomount.c
+++ b/mount/lomount.c
@@ -938,6 +938,32 @@ set_loop(const char *device, const char *file, unsigned long long offset,
 	return 0;
 }
 
+static int
+delete_all_devices (void)
+{
+	struct looplist ll;
+	int fd;
+	int ok = 0;
+
+	if (looplist_open(&ll, LLFLG_USEDONLY) == -1) {
+		error(_("%s: /dev directory does not exist."), progname);
+		return 1;
+	}
+
+	while((fd = looplist_next(&ll)) != -1) {
+		close(fd);
+		ok |= del_loop(ll.name);
+	}
+	looplist_close(&ll);
+
+	if (!ll.ct_succ && ll.ct_perm) {
+		error(_("%s: no permission to look at /dev/loop%s<N>"), progname,
+				(ll.flag & LLFLG_SUBDIR) ? "/" : "");
+		return 1;
+	}
+	return ok;
+}
+
 int
 del_loop (const char *device) {
 	int fd, errsv;
@@ -1015,6 +1041,7 @@ usage(FILE *out) {
 	_(" %1$s loop_device                             give info\n"
 	  " %1$s -a | --all                              list all used\n"
 	  " %1$s -d | --detach <loopdev> [<loopdev> ...] delete\n"
+	  " %1$s -D | --detach-all                       delete all used\n"
 	  " %1$s -f | --find                             find unused\n"
 	  " %1$s -c | --set-capacity <loopdev>           resize\n"
 	  " %1$s -j | --associated <file> [-o <num>]     list all associated with <file>\n"
@@ -1037,7 +1064,7 @@ usage(FILE *out) {
 int
 main(int argc, char **argv) {
 	char *p, *offset, *sizelimit, *encryption, *passfd, *device, *file, *assoc;
-	int delete, find, c, all, capacity;
+	int delete, delete_all, find, c, all, capacity;
 	int res = 0;
 	int showdev = 0;
 	int ro = 0;
@@ -1048,6 +1075,7 @@ main(int argc, char **argv) {
 		{ "all", 0, 0, 'a' },
 		{ "set-capacity", 0, 0, 'c' },
 		{ "detach", 0, 0, 'd' },
+		{ "detach-all", 0, 0, 'D' },
 		{ "encryption", 1, 0, 'e' },
 		{ "find", 0, 0, 'f' },
 		{ "help", 0, 0, 'h' },
@@ -1065,14 +1093,14 @@ main(int argc, char **argv) {
 	bindtextdomain(PACKAGE, LOCALEDIR);
 	textdomain(PACKAGE);
 
-	capacity = delete = find = all = 0;
+	capacity = delete = delete_all = find = all = 0;
 	assoc = offset = sizelimit = encryption = passfd = NULL;
 
 	progname = argv[0];
 	if ((p = strrchr(progname, '/')) != NULL)
 		progname = p+1;
 
-	while ((c = getopt_long(argc, argv, "acde:E:fhj:o:p:rsv",
+	while ((c = getopt_long(argc, argv, "acdDe:E:fhj:o:p:rsv",
 				longopts, NULL)) != -1) {
 		switch (c) {
 		case 'a':
@@ -1087,6 +1115,9 @@ main(int argc, char **argv) {
 		case 'd':
 			delete = 1;
 			break;
+		case 'D':
+			delete_all = 1;
+			break;
 		case 'E':
 		case 'e':
 			encryption = optarg;
@@ -1128,10 +1159,14 @@ main(int argc, char **argv) {
 		if (argc < optind+1 || encryption || offset || sizelimit ||
 		    capacity || find || all || showdev || assoc || ro)
 			usage(stderr);
+	} else if (delete_all) {
+		if (argc > optind || encryption || offset || sizelimit ||
+		    capacity || find || all || showdev || assoc || ro)
+			usage(stderr);
 	} else if (find) {
 		if (capacity || all || assoc || argc < optind || argc > optind+1)
 			usage(stderr);
-	} else if (all) {
+	} else if (all || delete_all) {
 		/* only -v is allowed */
 		if ((argc == 3 && verbose == 0) || argc > 3)
 			usage(stderr);
@@ -1159,6 +1194,8 @@ main(int argc, char **argv) {
 
 	if (all)
 		return show_used_loop_devices();
+	else if (delete_all)
+		return delete_all_devices();
 	else if (assoc)
 		return show_associated_loop_devices(assoc, off, offset ? 1 : 0);
 	else if (find) {