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Description: Backport blockdev applet from upstream
This allows os-prober to avoid replaying journals when mounting block
devices read-only.
Origin: http://git.busybox.net/busybox/tree/util-linux/blockdev.c
Bug-Debian: http://bugs.debian.org/418163
Author: Sergey Naumov <sknaumov@gmail.com>
Author: Denys Vlasenko <dvlasenk@redhat.com>
Forwarded: not-needed
Last-Update: 2010-11-09
Index: b/util-linux/blockdev.c
===================================================================
--- /dev/null
+++ b/util-linux/blockdev.c
@@ -0,0 +1,195 @@
+/*
+ * blockdev implementation for busybox
+ *
+ * Copyright (C) 2010 Sergey Naumov <sknaumov@gmail.com>
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+//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 BLOCKDEV"
+//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,
+ /* Yes, BLKGETSIZE64 takes pointer to uint64_t, not ullong! */
+ ARG_U64 = 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_U64,
+ .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)
+{
+ const struct bdc *bdcmd = bdcommands;
+ if (s[0] == '-' && s[1] == '-') {
+ s += 2;
+ do {
+ if (strcmp(s, bdcmd->name) == 0)
+ return bdcmd;
+ bdcmd++;
+ } while (bdcmd != bdcommands + ARRAY_SIZE(bdcommands));
+ }
+ bb_show_usage();
+}
+
+int blockdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int blockdev_main(int argc, char **argv)
+{
+ const struct bdc *bdcmd;
+ int fd;
+ uint64_t u64;
+ union {
+ int i;
+ unsigned long lu;
+ uint64_t u64;
+ } ioctl_val_on_stack;
+
+ if ((unsigned)(argc - 3) > 1) /* must have 2 or 3 args */
+ bb_show_usage();
+
+ bdcmd = find_cmd(*++argv);
+
+ u64 = (int)bdcmd->argval;
+ if (bdcmd->flags & FL_USRARG)
+ u64 = xatoi_u(*++argv);
+
+ if (!*++argv || argv[1])
+ bb_show_usage();
+ fd = xopen(*argv, O_RDONLY);
+
+ ioctl_val_on_stack.u64 = u64;
+#if BB_BIG_ENDIAN
+ /* Store data properly wrt data size.
+ * (1) It's no-op for little-endian.
+ * (2) it's no-op for 0 and -1. Only --setro uses arg != 0 and != -1,
+ * and it is ARG_INT. --setbsz USER_VAL is also ARG_INT.
+ * Thus, we don't need to handle ARG_ULONG.
+ */
+ switch (bdcmd->flags & ARG_MASK) {
+ case ARG_INT:
+ ioctl_val_on_stack.i = (int)u64;
+ break;
+# if 0 /* unused */
+ case ARG_ULONG:
+ ioctl_val_on_stack.lu = (unsigned long)u64;
+ break;
+# endif
+ }
+#endif
+
+ if (ioctl(fd, bdcmd->ioc, &ioctl_val_on_stack.u64) == -1)
+ bb_simple_perror_msg_and_die(*argv);
+
+ /* Fetch it into register(s) */
+ u64 = ioctl_val_on_stack.u64;
+
+ /* Zero- or one-extend the value if needed, then print */
+ 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)(int)u64);
+ break;
+ case ARG_ULONG:
+ u64 = (unsigned long)u64;
+ /* FALLTHROUGH */
+ case ARG_U64:
+ printf("%llu\n", (unsigned long long)u64);
+ break;
+ }
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(fd);
+ return EXIT_SUCCESS;
+}
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