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/* blkdiscard - discard device sectors
*
* Copyright 2020 Patrick Oppenlander <patrick.oppenlander@gmail.com>
*
* See http://man7.org/linux/man-pages/man8/blkdiscard.8.html
*
* The -v and -p options are not supported.
* Size parsing does not match util-linux where MB, GB, TB are multiples of
* 1000 and MiB, TiB, GiB are multipes of 1024.
USE_BLKDISCARD(NEWTOY(blkdiscard, "<1>1f(force)l(length):o(offset):s(secure)z(zeroout)[!sz]", TOYFLAG_BIN))
config BLKDISCARD
bool "blkdiscard"
default y
help
usage: blkdiscard [-olszf] DEVICE
Discard device sectors.
-o, --offset OFF Byte offset to start discarding at (default 0)
-l, --length LEN Bytes to discard (default all)
-s, --secure Perform secure discard
-z, --zeroout Zero-fill rather than discard
-f, --force Disable check for mounted filesystem
OFF and LEN must be aligned to the device sector size.
By default entire device is discarded.
WARNING: All discarded data is permanently lost!
*/
#define FOR_blkdiscard
#include "toys.h"
#include <linux/fs.h>
GLOBALS(
char *o, *l;
)
void blkdiscard_main(void)
{
int fd = xopen(*toys.optargs, O_WRONLY|O_EXCL*!FLAG(f));
unsigned long long ol[2];
ol[0] = FLAG(o) ? atolx_range(TT.o, 0, LLONG_MAX) : 0;
if (FLAG(l)) ol[1] = atolx_range(TT.l, 0, LLONG_MAX);
else {
xioctl(fd, BLKGETSIZE64, ol+1);
ol[1] -= ol[0];
}
xioctl(fd, FLAG(s) ? BLKSECDISCARD : FLAG(z) ? BLKZEROOUT : BLKDISCARD, ol);
if (CFG_TOYBOX_FREE) close(fd);
}
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