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authorBertold Van den Bergh <vandenbergh@bertold.org>2014-05-25 20:49:51 -0500
committerBertold Van den Bergh <vandenbergh@bertold.org>2014-05-25 20:49:51 -0500
commit7cb7cca7f5759c6921d68a384fd838e01ce446e0 (patch)
tree835f4d616c2ba9715d70e4c0bfc4dcdb5070ed21 /toys/pending/partprobe.c
parent1c806ca536dc938f949546b28974db79ae85941f (diff)
downloadtoybox-7cb7cca7f5759c6921d68a384fd838e01ce446e0.tar.gz
I have attached a patch adding a program that allows re-reading the partition table. This is often used on embedded systems booting from SD/USB devices that need to resize partitions on first boot.
Diffstat (limited to 'toys/pending/partprobe.c')
-rw-r--r--toys/pending/partprobe.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/toys/pending/partprobe.c b/toys/pending/partprobe.c
new file mode 100644
index 00000000..2fe3bd53
--- /dev/null
+++ b/toys/pending/partprobe.c
@@ -0,0 +1,51 @@
+/* partprobe.c - Tell the kernel about partition table changes
+ *
+ * Copyright 2014 Bertold Van den Bergh <vandenbergh@bertold.org>
+ *
+ * see http://man7.org/linux/man-pages/man8/partprobe.8.html
+
+USE_PARTPROBE(NEWTOY(partprobe, NULL, TOYFLAG_SBIN))
+
+config PARTPROBE
+ bool "partprobe"
+ default n
+ help
+ partprobe - Tell the kernel about partition table changes
+
+ usage: partprobe [devices...]
+
+ Asks the kernel to re-read the partition table on the specified
+ devices.
+*/
+
+#include "toys.h"
+
+void update_device(char* path)
+{
+ int sd_fd = open(path, 0);
+
+ if(sd_fd < 0){
+ perror_msg("Unable to open %s", path);
+ return;
+ }
+
+ if(ioctl(sd_fd, BLKRRPART, NULL) < 0)
+ perror_msg("ioctl (BLKRRPART) failed, old layout still used");
+
+ close(sd_fd);
+}
+
+void partprobe_main(void)
+{
+ char** opt;
+ if(*toys.optargs == NULL){
+ printf("No devices specified.\n");
+ exit(EXIT_FAILURE);
+ }
+
+ for (opt = toys.optargs; *opt; opt++) {
+ update_device(*opt);
+ }
+
+ exit(EXIT_SUCCESS);
+}