*
* Copyright (C) 2010 Sergey Naumov <sknaumov@gmail.com>
*
- * Licensed under GPLv2, see file License in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
-
-//applet:IF_BLOCKDEV(APPLET(blockdev, _BB_DIR_SBIN, _BB_SUID_DROP))
-
-//kbuild:lib-$(CONFIG_BLOCKDEV) += blockdev.o
-
//config:config BLOCKDEV
-//config: bool "blockdev"
+//config: bool "blockdev (2.4 kb)"
//config: default y
//config: help
-//config: Performs some ioctls with block devices.
+//config: Performs some ioctls with block devices.
+
+//applet:IF_BLOCKDEV(APPLET_NOEXEC(blockdev, blockdev, BB_DIR_SBIN, BB_SUID_DROP, blockdev))
+
+//kbuild:lib-$(CONFIG_BLOCKDEV) += blockdev.o
//usage:#define blockdev_trivial_usage
-//usage: "OPTION [OPTARG] DEVICE"
+//usage: "OPTION BLOCKDEV"
//usage:#define blockdev_full_usage "\n\n"
-//usage: "Options:"
-//usage: "\n --setro Set ro"
+//usage: " --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 --getsz Get device size in 512-byte sectors"
+/*//usage: "\n --getsize Get device size in sectors (deprecated)"*/
//usage: "\n --getsize64 Get device size in bytes"
//usage: "\n --flushbufs Flush buffers"
//usage: "\n --rereadpt Reread partition table"
ARG_NONE = 0,
ARG_INT = 1,
ARG_ULONG = 2,
- ARG_ULLONG = 3,
+ /* 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,
+ FL_SCALE512 = 16,
};
struct bdc {
.name = "setbsz",
.flags = ARG_INT + FL_NORESULT + FL_USRARG,
.argval = 0,
+ },{
+ .ioc = BLKGETSIZE64,
+ .name = "getsz",
+ .flags = ARG_U64 + FL_SCALE512,
+ .argval = -1,
},{
.ioc = BLKGETSIZE,
.name = "getsize",
},{
.ioc = BLKGETSIZE64,
.name = "getsize64",
- .flags = ARG_ULLONG,
+ .flags = ARG_U64,
.argval = -1,
},{
.ioc = BLKFLSBUF,
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];
+ 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)
+int blockdev_main(int argc UNUSED_PARAM, 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 */
+ uint64_t u64;
+ union {
+ int i;
+ unsigned long lu;
+ uint64_t u64;
+ } ioctl_val_on_stack;
+
+ argv++;
+ if (!argv[0] || !argv[1]) /* must have at least 2 args */
bb_show_usage();
- bdcmd = find_cmd(*++argv);
+ bdcmd = find_cmd(*argv);
- llu = (int)bdcmd->argval;
+ u64 = (int)bdcmd->argval;
if (bdcmd->flags & FL_USRARG)
- llu = xatoi_positive(*++argv);
- lu = llu;
- iarg = llu;
+ u64 = xatoi_positive(*++argv);
- if (!*++argv)
+ argv++;
+ if (!argv[0] || argv[1])
bb_show_usage();
- fd = xopen(*argv, O_RDONLY);
-
- ioctl_ptr = NULL;
+ fd = xopen(argv[0], 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_ptr = &iarg;
+ ioctl_val_on_stack.i = (int)u64;
break;
+# if 0 /* unused */
case ARG_ULONG:
- ioctl_ptr = &lu;
- break;
- case ARG_ULLONG:
- ioctl_ptr = &llu;
+ ioctl_val_on_stack.lu = (unsigned long)u64;
break;
+# endif
}
+#endif
- if (ioctl(fd, bdcmd->ioc, ioctl_ptr) == -1)
+ 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;
+
+ if (bdcmd->flags & FL_SCALE512)
+ u64 >>= 9;
+
+ /* 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)iarg);
+ printf("%lld\n", (long long)(int)u64);
break;
case ARG_ULONG:
- llu = lu;
+ u64 = (unsigned long)u64;
/* FALLTHROUGH */
- case ARG_ULLONG:
- printf("%llu\n", llu);
+ case ARG_U64:
+ printf("%llu\n", (unsigned long long)u64);
break;
}