A toy _BLOCKDEV_ to get/set block device properties.

1 files changed, 92 insertions, 0 deletions

diff --git a/toys/pending/blockdev.c b/toys/pending/blockdev.c
new file mode 100644
index 00000000..9f0176f3
--- /dev/null
+++ b/toys/pending/blockdev.c
@@ -0,0 +1,92 @@
+/* blockdev.c -show/set blockdev information.
+ *
+ * Copyright 2014 Sameer Prakash Pradhan <sameer.p.pradhan@gmail.com>
+ *
+ * No Standard.
+ *
+
+USE_BLOCKDEV(NEWTOY(blockdev, "<1>1(setro)(setrw)(getro)(getss)(getbsz)(setbsz)#<0(getsz)(getsize)(getsize64)(flushbufs)(rereadpt)",TOYFLAG_USR|TOYFLAG_BIN))
+
+config BLOCKDEV
+  bool "blockdev"
+  default n
+  help
+  usage:blockdev OPTION BLOCKDEV
+ 
+ 
+  setro	Set ro
+  setrw	Set rw
+  getro	Get ro
+  getss	Get sector size
+  getbsz Get block size
+  setbsz BYTES	Set block size
+  getsz Get device size in 512-byte sectors
+  getsize Get device size in sectors (deprecated)
+  getsize64	Get device size in bytes
+  flushbufs	Flush buffers
+  rereadpt Reread partition table
+*/
+
+#define FOR_blockdev
+#include "toys.h"
+#include <linux/fs.h>
+
+GLOBALS(
+  long bsz;
+)
+
+void blockdev_main(void)
+{
+  long long val = 0;
+  int cmd, fd, set = 0;
+
+  switch (toys.optflags) {
+    case FLAG_setro:
+      cmd = BLKROSET;
+      val = set = 1;
+      break;
+    case FLAG_setrw:
+      cmd = BLKROSET;
+      set = 1;
+      break;
+    case FLAG_getro:
+      cmd = BLKROGET;           
+      break;
+    case FLAG_getss:
+      cmd = BLKSSZGET;           
+      break;
+    case FLAG_getbsz:
+      cmd = BLKBSZGET;            
+      break;
+    case FLAG_setbsz:
+      cmd = BLKBSZSET;
+      set = 1;
+      val = TT.bsz;            
+      break;
+    case FLAG_getsz:
+      cmd = BLKGETSIZE64;            
+      break;
+    case FLAG_getsize:
+      cmd = BLKGETSIZE;            
+      break;
+    case FLAG_getsize64:
+      cmd = BLKGETSIZE64;            
+      break;
+    case FLAG_flushbufs:
+      cmd = BLKFLSBUF;
+      set = 1;
+      break;
+    case FLAG_rereadpt:
+      cmd = BLKRRPART;
+      set = 1;
+      break;
+    default:
+      toys.exithelp = 1;
+      error_exit(NULL);
+  }
+  fd = xopen(*toys.optargs, O_RDONLY);
+  xioctl(fd, cmd, &val);
+  if (!set) 
+    printf("%lld\n",  ((toys.optflags & FLAG_getsz)?val >> 9: val));          
+  if (CFG_TOYBOX_FREE) xclose(fd);
+}