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-rw-r--r--toys/other/blockdev.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/toys/other/blockdev.c b/toys/other/blockdev.c
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+++ b/toys/other/blockdev.c
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+/* 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 y
+ help
+ usage: blockdev --OPTION... BLOCKDEV...
+
+ Call ioctl(s) on each listed block device
+
+ OPTIONs:
+ --setro Set read only
+ --setrw Set read write
+ --getro Get read only
+ --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)
+{
+ int cmds[] = {BLKRRPART, BLKFLSBUF, BLKGETSIZE64, BLKGETSIZE, BLKGETSIZE64,
+ BLKBSZSET, BLKBSZGET, BLKSSZGET, BLKROGET, BLKROSET, BLKROSET};
+ char **ss;
+ long long val = 0;
+
+ if (!toys.optflags) {
+ toys.exithelp = 1;
+ error_exit("need --option");
+ }
+
+ for (ss = toys.optargs; *ss; ss++) {
+ int fd = xopen(*ss, O_RDONLY), i;
+
+ // Command line order discarded so perform multiple operations in flag order
+ for (i = 0; i < 32; i++) {
+ long flag = toys.optflags & (1<<i);
+
+ if (!flag) continue;
+
+ if (flag & FLAG_setbsz) val = TT.bsz;
+ else val = !!(flag & FLAG_setro);
+
+ xioctl(fd, cmds[i], &val);
+
+ flag &= FLAG_setbsz|FLAG_setro|FLAG_flushbufs|FLAG_rereadpt|FLAG_setrw;
+ if (!flag) printf("%lld\n", (toys.optflags & FLAG_getsz) ? val >> 9: val);
+ }
+ xclose(fd);
+ }
+}