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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 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);
}
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