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