From f175083413f0f94de88def865eeb65e465ded389 Mon Sep 17 00:00:00 2001 From: Frank Haverkamp Date: Wed, 14 Jun 2006 11:53:59 +0200 Subject: UBI - Unsorted Block Images UBI (Latin: "where?") manages multiple logical volumes on a single flash device, specifically supporting NAND flash devices. UBI provides a flexible partitioning concept which still allows for wear-levelling across the whole flash device. In a sense, UBI may be compared to the Logical Volume Manager (LVM). Whereas LVM maps logical sector numbers to physical HDD sector numbers, UBI maps logical eraseblocks to physical eraseblocks. More information may be found in the UBI design documentation: ubidesign.pdf. Which can be found here: http://www.linux-mtd.infradead.org/doc/ubi.html Partitioning/Re-partitioning An UBI volume occupies a certain number of erase blocks. This is limited by a configured maximum volume size, which could also be viewed as the partition size. Each individual UBI volume's size can be changed independently of the other UBI volumes, provided that the sum of all volume sizes doesn't exceed a certain limit. UBI supports dynamic volumes and static volumes. Static volumes are read-only and their contents are protected by CRC check sums. Bad eraseblocks handling UBI transparently handles bad eraseblocks. When a physical eraseblock becomes bad, it is substituted by a good physical eraseblock, and the user does not even notice this. Scrubbing On a NAND flash bit flips can occur on any write operation, sometimes also on read. If bit flips persist on the device, at first they can still be corrected by ECC, but once they accumulate, correction will become impossible. Thus it is best to actively scrub the affected eraseblock, by first copying it to a free eraseblock and then erasing the original. The UBI layer performs this type of scrubbing under the covers, transparently to the UBI volume users. Erase Counts UBI maintains an erase count header per eraseblock. This frees higher-level layers (like file systems) from doing this and allows for centralized erase count management instead. The erase counts are used by the wear-levelling algorithm in the UBI layer. The algorithm itself is exchangeable. Booting from NAND For booting directly from NAND flash the hardware must at least be capable of fetching and executing a small portion of the NAND flash. Some NAND flash controllers have this kind of support. They usually limit the window to a few kilobytes in erase block 0. This "initial program loader" (IPL) must then contain sufficient logic to load and execute the next boot phase. Due to bad eraseblocks, which may be randomly scattered over the flash device, it is problematic to store the "secondary program loader" (SPL) statically. Also, due to bit-flips it may become corrupted over time. UBI allows to solve this problem gracefully by storing the SPL in a small static UBI volume. UBI volumes vs. static partitions UBI volumes are still very similar to static MTD partitions: * both consist of eraseblocks (logical eraseblocks in case of UBI volumes, and physical eraseblocks in case of static partitions; * both support three basic operations - read, write, erase. But UBI volumes have the following advantages over traditional static MTD partitions: * there are no eraseblock wear-leveling constraints in case of UBI volumes, so the user should not care about this; * there are no bit-flips and bad eraseblocks in case of UBI volumes. So, UBI volumes may be considered as flash devices with relaxed restrictions. Where can it be found? Documentation, kernel code and applications can be found in the MTD gits. What are the applications for? The applications help to create binary flash images for two purposes: pfi files (partial flash images) for in-system update of UBI volumes, and plain binary images, with or without OOB data in case of NAND, for a manufacturing step. Furthermore some tools are/and will be created that allow flash content analysis after a system has crashed. Who did UBI? The original ideas, where UBI is based on, were developed by Andreas Arnez, Frank Haverkamp and Thomas Gleixner. Josh W. Boyer and some others were involved too. The implementation of the kernel layer was done by Artem B. Bityutskiy. The user-space applications and tools were written by Oliver Lohmann with contributions from Frank Haverkamp, Andreas Arnez, and Artem. Joern Engel contributed a patch which modifies JFFS2 so that it can be run on a UBI volume. Thomas Gleixner did modifications to the NAND layer and also some to JFFS2 to make it work. Signed-off-by: Frank Haverkamp --- ubi-utils/src/ubiwritevol/ubiwritevol.c | 352 ++++++++++++++++++++++++++++++++ 1 file changed, 352 insertions(+) create mode 100644 ubi-utils/src/ubiwritevol/ubiwritevol.c (limited to 'ubi-utils/src/ubiwritevol') diff --git a/ubi-utils/src/ubiwritevol/ubiwritevol.c b/ubi-utils/src/ubiwritevol/ubiwritevol.c new file mode 100644 index 0000000..8fdbe37 --- /dev/null +++ b/ubi-utils/src/ubiwritevol/ubiwritevol.c @@ -0,0 +1,352 @@ +/* + * Copyright (c) International Business Machines Corp., 2006 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Author: Frank Haverkamp + * + * An utility to update UBI volumes. + */ + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define MAXPATH 1024 +#define BUFSIZE 128 * 1024 +#define MIN(x,y) ((x)<(y)?(x):(y)) + +struct args { + int device; + int volume; + int truncate; + int broken_update; + int bufsize; + + /* special stuff needed to get additional arguments */ + char *arg1; + char **options; /* [STRING...] */ +}; + +static struct args myargs = { + .device = -1, + .volume = -1, + .truncate = 0, + .broken_update = 0, + .bufsize = BUFSIZE, + .arg1 = NULL, + .options = NULL, +}; + +static int verbose = 0; + +static error_t parse_opt (int key, char *arg, struct argp_state *state); + +const char *argp_program_bug_address = ""; + +static char doc[] = "\nVersion: " VERSION "\n\t" + HOST_OS" "HOST_CPU" at "__DATE__" "__TIME__"\n" + "\nWrite to UBI Volume.\n"; + +static struct argp_option options[] = { + { .name = "device", + .key = 'd', + .arg = "", + .flags = 0, + .doc = "UBI device", + .group = OPTION_ARG_OPTIONAL }, + + { .name = "volume", + .key = 'n', + .arg = "", + .flags = 0, + .doc = "UBI volume id", + .group = OPTION_ARG_OPTIONAL }, + + { .name = "truncate", + .key = 't', + .arg = NULL, + .flags = 0, + .doc = "truncate volume", + .group = OPTION_ARG_OPTIONAL }, + + { .name = "broken-update", + .key = 'B', + .arg = NULL, + .flags = 0, + .doc = "broken update, this is for testing", + .group = OPTION_ARG_OPTIONAL }, + + { .name = NULL, .key = 0, .arg = NULL, .flags = 0, + .doc = NULL, .group = 0 }, +}; + +static struct argp argp = { + .options = options, + .parser = parse_opt, + .args_doc = 0, + .doc = doc, + .children = NULL, + .help_filter = NULL, + .argp_domain = NULL, +}; + +/* + * @brief Parse the arguments passed into the test case. + * + * @param key The parameter. + * @param arg Argument passed to parameter. + * @param state Location to put information on parameters. + * + * @return error + * + * Get the `input' argument from `argp_parse', which we know is a + * pointer to our arguments structure. + */ +static error_t +parse_opt(int key, char *arg, struct argp_state *state) +{ + struct args *args = state->input; + + switch (key) { + case 'v': /* --verbose= */ + verbose = strtoul(arg, (char **)NULL, 0); + break; + + case 'd': /* --device= */ + args->device = strtol(arg, (char **)NULL, 0); + break; + + case 'b': /* --bufsize= */ + args->bufsize = strtol(arg, (char **)NULL, 0); + if (args->bufsize <= 0) + args->bufsize = BUFSIZE; + break; + + case 't': /* --truncate */ + args->truncate = 1; + break; + + case 'B': /* --broken-update */ + args->broken_update = 1; + break; + + case 'n': /* --volume= */ + args->volume = strtol(arg, (char **)NULL, 0); + break; + + case ARGP_KEY_NO_ARGS: + /* argp_usage(state); */ + break; + + case ARGP_KEY_ARG: + args->arg1 = arg; + /* Now we consume all the rest of the arguments. + `state->next' is the index in `state->argv' of the + next argument to be parsed, which is the first STRING + we're interested in, so we can just use + `&state->argv[state->next]' as the value for + arguments->strings. + + _In addition_, by setting `state->next' to the end + of the arguments, we can force argp to stop parsing here and + return. */ + + args->options = &state->argv[state->next]; + state->next = state->argc; + break; + + case ARGP_KEY_END: + /* argp_usage(state); */ + break; + + default: + return(ARGP_ERR_UNKNOWN); + } + + return 0; +} + +/** + * @bytes bytes must be always 0, if not 0 this is a testcase for a + * broken volume update where data is promissed to be written, but for + * some reason nothing is written. The volume is unusable after this. + */ +static int +ubi_truncate_volume(struct args *args, int64_t bytes) +{ + int rc, ofd; + char path[MAXPATH]; + int old_errno; + + snprintf(path, MAXPATH-1, "/dev/ubi%d_%d", args->device, args->volume); + path[MAXPATH-1] = '\0'; + + ofd = open(path, O_RDWR); + if (ofd < 0) { + fprintf(stderr, "Cannot open volume %s\n", path); + exit(EXIT_FAILURE); + } + rc = ioctl(ofd, UBI_IOCVOLUP, &bytes); + old_errno = errno; + if (rc < 0) { + perror("UBI volume update ioctl"); + fprintf(stderr, " rc=%d errno=%d\n", rc, old_errno); + exit(EXIT_FAILURE); + } + close(ofd); + return 0; +} + +static ssize_t ubi_write(int fd, const void *buf, size_t count) +{ + int rc; + int len = count; + + while (len) { + rc = write(fd, buf, len); + if (rc == -1) { + if (errno == EINTR) + continue; /* try again */ + perror("write error"); + return rc; + } + + len -= rc; + buf += rc; + } + return count; +} + +static int +ubi_update_volume(struct args *args) +{ + int rc, ofd; + FILE *ifp = NULL; + struct stat st; + int size = 0; + char *fname = args->arg1; + char path[MAXPATH]; + char *buf; + int64_t bytes = 0; + int old_errno; + + buf = malloc(args->bufsize); + if (!buf) { + perror("Out of memory"); + exit(EXIT_FAILURE); + } + + if (fname == NULL) { + fprintf(stderr, "Please specify an existing file.\n"); + exit(EXIT_FAILURE); + } + + rc = stat(fname, &st); + if (rc < 0) { + fprintf(stderr, "Cannot stat input file %s\n", fname); + exit(EXIT_FAILURE); + } + bytes = size = st.st_size; + + ifp = fopen(fname, "r"); + if (!ifp) + exit(EXIT_FAILURE); + + snprintf(path, MAXPATH-1, "/dev/ubi%d_%d", args->device, args->volume); + path[MAXPATH-1] = '\0'; + + ofd = open(path, O_RDWR); + if (ofd < 0) { + fprintf(stderr, "Cannot open UBI volume %s\n", path); + exit(EXIT_FAILURE); + } + + rc = ioctl(ofd, UBI_IOCVOLUP, &bytes); + old_errno = errno; + if (rc < 0) { + perror("UBI volume update ioctl"); + fprintf(stderr, " rc=%d errno=%d\n", rc, old_errno); + exit(EXIT_FAILURE); + } + + while (size > 0) { + ssize_t tocopy = MIN(args->bufsize, size); + + rc = fread(buf, tocopy, 1, ifp); + if (rc != 1) { + perror("Could not read everything."); + exit(EXIT_FAILURE); + } + + rc = ubi_write(ofd, buf, tocopy); + old_errno = errno; + if (rc != tocopy) { + perror("Could not write to device"); + fprintf(stderr, " rc=%d errno=%d\n", rc, old_errno); + exit(EXIT_FAILURE); + } + size -= tocopy; + } + + free(buf); + fclose(ifp); + rc = close(ofd); + if (rc != 0) { + perror("UBI volume close failed"); + exit(EXIT_FAILURE); + } + return 0; +} + +int +main(int argc, char *argv[]) +{ + int rc; + + argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, &myargs); + + if (myargs.truncate) { + rc = ubi_truncate_volume(&myargs, 0LL); + if (rc < 0) + exit(EXIT_FAILURE); + exit(EXIT_SUCCESS); + } + if (myargs.broken_update) { + rc = ubi_truncate_volume(&myargs, 1LL); + if (rc < 0) + exit(EXIT_FAILURE); + exit(EXIT_SUCCESS); + } + rc = ubi_update_volume(&myargs); + if (rc < 0) + exit(EXIT_FAILURE); + + exit(EXIT_SUCCESS); +} -- cgit v1.2.3