* used. A pointer to a &struct ubi_set_vol_prop_req object is expected to be
* passed. The object describes which property should be set, and to which value
* it should be set.
+ *
+ * Block devices on UBI volumes
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * To create a R/O block device on top of an UBI volume the %UBI_IOCVOLCRBLK
+ * should be used. A pointer to a &struct ubi_blkcreate_req object is expected
+ * to be passed, which is not used and reserved for future usage.
+ *
+ * Conversely, to remove a block device the %UBI_IOCVOLRMBLK should be used,
+ * which takes no arguments.
*/
/*
/* Set an UBI volume property */
#define UBI_IOCSETVOLPROP _IOW(UBI_VOL_IOC_MAGIC, 6, \
struct ubi_set_vol_prop_req)
+/* Create a R/O block device on top of an UBI volume */
+#define UBI_IOCVOLCRBLK _IOW(UBI_VOL_IOC_MAGIC, 7, struct ubi_blkcreate_req)
+/* Remove the R/O block device */
+#define UBI_IOCVOLRMBLK _IO(UBI_VOL_IOC_MAGIC, 8)
/* Maximum MTD device name length supported by UBI */
#define MAX_UBI_MTD_NAME_LEN 127
uint64_t value;
} __attribute__((packed));
+/**
+ * struct ubi_blkcreate_req - a data structure used in block creation requests.
+ * @padding: reserved for future, not used, has to be zeroed
+ */
+struct ubi_blkcreate_req {
+ int8_t padding[128];
+} __attribute__((packed));
+
#endif /* __UBI_USER_H__ */
--- /dev/null
+/*
+ * Copyright (c) Ezequiel Garcia, 2014
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * An utility to create/remove block devices on top of UBI volumes.
+ */
+
+#define PROGRAM_NAME "ubiblock"
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <getopt.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include <libubi.h>
+#include "common.h"
+
+struct args {
+ const char *node;
+ int create;
+};
+
+static struct args args;
+
+static const char doc[] = PROGRAM_NAME " version " VERSION
+ " - a tool to create/remove block device interface from UBI volumes.";
+
+static const char optionsstr[] =
+"-c, --create create block on top of a volume\n"
+"-r, --remove remove block from volume\n"
+"-h, --help print help message\n"
+"-V, --version print program version";
+
+static const char usage[] =
+"Usage: " PROGRAM_NAME " [-c,-r] <UBI volume node file name>\n"
+"Example: " PROGRAM_NAME " --create /dev/ubi0_0";
+
+static const struct option long_options[] = {
+ { .name = "create", .has_arg = 1, .flag = NULL, .val = 'c' },
+ { .name = "remove", .has_arg = 1, .flag = NULL, .val = 'r' },
+ { .name = "help", .has_arg = 0, .flag = NULL, .val = 'h' },
+ { .name = "version", .has_arg = 0, .flag = NULL, .val = 'V' },
+ { NULL, 0, NULL, 0}
+};
+
+static int parse_opt(int argc, char * const argv[])
+{
+ while (1) {
+ int key;
+
+ key = getopt_long(argc, argv, "c:r:h?V", long_options, NULL);
+ if (key == -1)
+ break;
+
+ switch (key) {
+ case 'c':
+ args.create = 1;
+ case 'r':
+ args.node = optarg;
+ break;
+ case 'h':
+ case '?':
+ printf("%s\n\n", doc);
+ printf("%s\n\n", usage);
+ printf("%s\n", optionsstr);
+ exit(EXIT_SUCCESS);
+
+ case 'V':
+ common_print_version();
+ exit(EXIT_SUCCESS);
+
+ default:
+ fprintf(stderr, "Use -h for help\n");
+ return -1;
+ }
+ }
+
+ if (!args.node)
+ return errmsg("invalid arguments (use -h for help)");
+
+ return 0;
+}
+
+int main(int argc, char * const argv[])
+{
+ int err, fd;
+ libubi_t libubi;
+
+ err = parse_opt(argc, argv);
+ if (err)
+ return -1;
+
+ libubi = libubi_open();
+ if (!libubi) {
+ if (errno == 0)
+ errmsg("UBI is not present in the system");
+ return sys_errmsg("cannot open libubi");
+ }
+
+ err = ubi_probe_node(libubi, args.node);
+ if (err == 1) {
+ errmsg("\"%s\" is an UBI device node, not an UBI volume node",
+ args.node);
+ goto out_libubi;
+ } else if (err < 0) {
+ if (errno == ENODEV)
+ errmsg("\"%s\" is not an UBI volume node", args.node);
+ else
+ sys_errmsg("error while probing \"%s\"", args.node);
+ goto out_libubi;
+ }
+
+ fd = open(args.node, O_RDWR);
+ if (fd == -1) {
+ sys_errmsg("cannot open UBI volume \"%s\"", args.node);
+ goto out_libubi;
+ }
+
+ if (args.create) {
+ err = ubi_vol_block_create(fd);
+ if (err) {
+ if (errno == ENOSYS)
+ errmsg("UBI block is not present in the system");
+ if (errno == ENOTTY)
+ errmsg("UBI block not supported (check your kernel version)");
+ sys_errmsg("cannot create block device");
+ goto out_close;
+ }
+ } else {
+ err = ubi_vol_block_remove(fd);
+ if (err) {
+ if (errno == ENOSYS)
+ errmsg("UBI block is not present in the system");
+ if (errno == ENOTTY)
+ errmsg("UBI block not supported (check your kernel version)");
+ sys_errmsg("cannot remove block device");
+ goto out_close;
+ }
+ }
+
+ close(fd);
+ libubi_close(libubi);
+ return 0;
+
+out_close:
+ close(fd);
+out_libubi:
+ libubi_close(libubi);
+ return -1;
+}
projects / mtd-utils.git / commitdiff