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-rw-r--r--util-linux/blockdev.c180
1 files changed, 180 insertions, 0 deletions
diff --git a/util-linux/blockdev.c b/util-linux/blockdev.c
new file mode 100644
index 0000000..eb5914b
--- /dev/null
+++ b/util-linux/blockdev.c
@@ -0,0 +1,180 @@
+/*
+ * blockdev implementation for busybox
+ *
+ * Copyright (C) 2010 Sergey Naumov <sknaumov@gmail.com>
+ *
+ * Licensed under GPLv2, see file License in this tarball for details.
+ */
+
+//applet:IF_BLOCKDEV(APPLET(blockdev, _BB_DIR_SBIN, _BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_BLOCKDEV) += blockdev.o
+
+//config:config BLOCKDEV
+//config: bool "blockdev"
+//config: default y
+//config: help
+//config: Performs some ioctls with block devices.
+
+//usage:#define blockdev_trivial_usage
+//usage: "OPTION [OPTARG] DEVICE"
+//usage:#define blockdev_full_usage "\n\n"
+//usage: "Options:"
+//usage: "\n --setro Set ro"
+//usage: "\n --setrw Set rw"
+//usage: "\n --getro Get ro"
+//usage: "\n --getss Get sector size"
+//usage: "\n --getbsz Get block size"
+//usage: "\n --setbsz BYTES Set block size"
+//usage: "\n --getsize Get device size in 512-byte sectors"
+//usage: "\n --getsize64 Get device size in bytes"
+//usage: "\n --flushbufs Flush buffers"
+//usage: "\n --rereadpt Reread partition table"
+
+
+#include "libbb.h"
+#include <linux/fs.h>
+
+enum {
+ ARG_NONE = 0,
+ ARG_INT = 1,
+ ARG_ULONG = 2,
+ ARG_ULLONG = 3,
+ ARG_MASK = 3,
+
+ FL_USRARG = 4, /* argument is provided by user */
+ FL_NORESULT = 8,
+};
+
+struct bdc {
+ uint32_t ioc; /* ioctl code */
+ const char name[sizeof("flushbufs")]; /* "--setfoo" wothout "--" */
+ uint8_t flags;
+ int8_t argval; /* default argument value */
+};
+
+static const struct bdc bdcommands[] = {
+ {
+ .ioc = BLKROSET,
+ .name = "setro",
+ .flags = ARG_INT + FL_NORESULT,
+ .argval = 1,
+ },{
+ .ioc = BLKROSET,
+ .name = "setrw",
+ .flags = ARG_INT + FL_NORESULT,
+ .argval = 0,
+ },{
+ .ioc = BLKROGET,
+ .name = "getro",
+ .flags = ARG_INT,
+ .argval = -1,
+ },{
+ .ioc = BLKSSZGET,
+ .name = "getss",
+ .flags = ARG_INT,
+ .argval = -1,
+ },{
+ .ioc = BLKBSZGET,
+ .name = "getbsz",
+ .flags = ARG_INT,
+ .argval = -1,
+ },{
+ .ioc = BLKBSZSET,
+ .name = "setbsz",
+ .flags = ARG_INT + FL_NORESULT + FL_USRARG,
+ .argval = 0,
+ },{
+ .ioc = BLKGETSIZE,
+ .name = "getsize",
+ .flags = ARG_ULONG,
+ .argval = -1,
+ },{
+ .ioc = BLKGETSIZE64,
+ .name = "getsize64",
+ .flags = ARG_ULLONG,
+ .argval = -1,
+ },{
+ .ioc = BLKFLSBUF,
+ .name = "flushbufs",
+ .flags = ARG_NONE + FL_NORESULT,
+ .argval = 0,
+ },{
+ .ioc = BLKRRPART,
+ .name = "rereadpt",
+ .flags = ARG_NONE + FL_NORESULT,
+ .argval = 0,
+ }
+};
+
+static const struct bdc *find_cmd(const char *s)
+{
+ int j;
+ if (*s++ == '-')
+ if (*s++ == '-')
+ for (j = 0; j < ARRAY_SIZE(bdcommands); j++)
+ if (strcmp(s, bdcommands[j].name) == 0)
+ return &bdcommands[j];
+ bb_show_usage();
+}
+
+int blockdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int blockdev_main(int argc, char **argv)
+{
+ const struct bdc *bdcmd;
+ void *ioctl_ptr;
+ int fd;
+ int iarg;
+ unsigned long lu;
+ unsigned long long llu;
+
+ if ((unsigned)(argc - 3) > 1) /* must have 2 or 3 args */
+ bb_show_usage();
+
+ bdcmd = find_cmd(*++argv);
+
+ llu = (int)bdcmd->argval;
+ if (bdcmd->flags & FL_USRARG)
+ llu = xatoi_positive(*++argv);
+ lu = llu;
+ iarg = llu;
+
+ if (!*++argv)
+ bb_show_usage();
+ fd = xopen(*argv, O_RDONLY);
+
+ ioctl_ptr = NULL;
+ switch (bdcmd->flags & ARG_MASK) {
+ case ARG_INT:
+ ioctl_ptr = &iarg;
+ break;
+ case ARG_ULONG:
+ ioctl_ptr = &lu;
+ break;
+ case ARG_ULLONG:
+ ioctl_ptr = &llu;
+ break;
+ }
+
+ if (ioctl(fd, bdcmd->ioc, ioctl_ptr) == -1)
+ bb_simple_perror_msg_and_die(*argv);
+
+ switch (bdcmd->flags & (ARG_MASK+FL_NORESULT)) {
+ case ARG_INT:
+ /* Smaller code when we use long long
+ * (gcc tail-merges printf call)
+ */
+ printf("%lld\n", (long long)iarg);
+ break;
+ case ARG_ULONG:
+ llu = lu;
+ /* FALLTHROUGH */
+ case ARG_ULLONG:
+ printf("%llu\n", llu);
+ break;
+ }
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(fd);
+ return EXIT_SUCCESS;
+}