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-rw-r--r--toys/pending/blkdiscard.c57
1 files changed, 17 insertions, 40 deletions
diff --git a/toys/pending/blkdiscard.c b/toys/pending/blkdiscard.c
index 1f0c09cd..77ec8894 100644
--- a/toys/pending/blkdiscard.c
+++ b/toys/pending/blkdiscard.c
@@ -2,38 +2,31 @@
*
* Copyright 2020 Patrick Oppenlander <patrick.oppenlander@gmail.com>
*
- * See https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/tree/sys-utils/blkdiscard.8
- *
- * These options are not supported:
- * -v, --verbose
- * -p, --step
- * -V, --version
+ * 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)", TOYFLAG_BIN))
+USE_BLKDISCARD(NEWTOY(blkdiscard, "<1>1f(force)l(length):o(offset):s(secure)z(zeroout)[!sz]", TOYFLAG_BIN))
config BLKDISCARD
bool "blkdiscard"
default n
help
- usage: blkdiscard [options] device
+ usage: blkdiscard [-olszf] DEVICE
Discard device sectors.
- -o, --offset OFF Byte offset from which to start discarding
- -l, --length LEN Number of bytes to discard
+ -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 checking for mounted filesystem
-
- By default OFF is zero and LEN is the device size meaning that the entire
- device will be discarded.
+ -f, --force Disable check for mounted filesystem
OFF and LEN must be aligned to the device sector size.
-
- WARNING: All discarded data will be permanently lost!
+ By default entire device is discarded.
+ WARNING: All discarded data is permanently lost!
*/
#define FOR_blkdiscard
@@ -42,37 +35,21 @@ config BLKDISCARD
#include <linux/fs.h>
GLOBALS(
- char *offset, *length;
+ char *o, *l;
)
void blkdiscard_main(void)
{
- int fd, req = BLKDISCARD;
- uint64_t off = 0, len;
-
- fd = xopen(toys.optargs[0], O_WRONLY | (FLAG(f) ? 0 : O_EXCL));
+ int fd = xopen(*toys.optargs, O_WRONLY|O_EXCL*!FLAG(f));
+ unsigned long long ol[2];
- if (FLAG(o)) off = atolx_range(TT.offset, 0, LLONG_MAX);
-
- if (FLAG(l)) len = atolx_range(TT.length, 0, LLONG_MAX);
+ 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 {
- if (ioctl(fd, BLKGETSIZE64, &len) < 0) {
- perror_msg("ioctl %x", (int)BLKGETSIZE64);
- goto out;
- }
- len -= off;
- }
-
- if (FLAG(s) && FLAG(z)) {
- error_msg("secure and zeroout are mutually exclusive");
- goto out;
+ xioctl(fd, BLKGETSIZE64, ol+1);
+ ol[1] -= ol[0];
}
- if (FLAG(s)) req = BLKSECDISCARD;
- if (FLAG(z)) req = BLKZEROOUT;
-
- if (ioctl(fd, req, (uint64_t[]){off, len}) < 0)
- perror_msg("ioctl %x", req);
+ xioctl(fd, FLAG(s) ? BLKSECDISCARD : FLAG(z) ? BLKZEROOUT : BLKDISCARD, ol);
-out:
if (CFG_TOYBOX_FREE) close(fd);
}