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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)(getra)(setra)#<0(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
--getra Get readahead in 512-byte sectors
--setra <sectors> Set readahead
--flushbufs Flush buffers
--rereadpt Reread partition table
*/
#define FOR_blockdev
#include "toys.h"
#include <linux/fs.h>
GLOBALS(
long bsz;
long ra;
)
void blockdev_main(void)
{
int cmds[] = {BLKRRPART, BLKFLSBUF, BLKRASET, BLKRAGET, BLKGETSIZE64, BLKGETSIZE, BLKGETSIZE64,
BLKBSZSET, BLKBSZGET, BLKSSZGET, BLKROGET, BLKROSET, BLKROSET};
char **ss;
long long val = 0;
if (!toys.optflags) help_exit("need --option");
for (ss = toys.optargs; *ss; ss++) {
int fd = xopenro(*ss), 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);
if (flag & FLAG_setra) val = TT.ra;
xioctl(fd, cmds[i], &val);
flag &= FLAG_setbsz|FLAG_setro|FLAG_flushbufs|FLAG_rereadpt|FLAG_setrw|FLAG_setbsz;
if (!flag) printf("%lld\n", (toys.optflags & FLAG_getsz) ? val >> 9: val);
}
xclose(fd);
}
}
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