diff options
Diffstat (limited to 'mtdutils/mtdutils.c')
| -rw-r--r-- | mtdutils/mtdutils.c | 812 |
1 files changed, 812 insertions, 0 deletions
diff --git a/mtdutils/mtdutils.c b/mtdutils/mtdutils.c new file mode 100644 index 000000000..7a22efe2e --- /dev/null +++ b/mtdutils/mtdutils.c @@ -0,0 +1,812 @@ +/* + * Copyright (C) 2007 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> +#include <sys/mount.h> // for _IOW, _IOR, mount() +#include <sys/stat.h> +#include <mtd/mtd-user.h> +#undef NDEBUG +#include <assert.h> + +#include "mtdutils.h" + +#ifdef RK3X + #include "rk3xhack.h" +#endif + +#ifdef BYNAME +static const char mtdprefix[] = "/dev/block/mtd/by-name/"; +#define MTD_BASENAME_OFFSET (sizeof(mtdprefix)-1) +#endif + +struct MtdReadContext { + const MtdPartition *partition; + char *buffer; + size_t consumed; + int fd; +}; + +struct MtdWriteContext { + const MtdPartition *partition; + char *buffer; + size_t stored; + int fd; + + off_t* bad_block_offsets; + int bad_block_alloc; + int bad_block_count; +}; + +typedef struct { + MtdPartition *partitions; + int partitions_allocd; + int partition_count; +} MtdState; + +static MtdState g_mtd_state = { + NULL, // partitions + 0, // partitions_allocd + -1 // partition_count +}; + +#define MTD_PROC_FILENAME "/proc/mtd" + +int +mtd_scan_partitions() +{ + char buf[2048]; + const char *bufp; + int fd; + int i; + ssize_t nbytes; + + if (g_mtd_state.partitions == NULL) { + const int nump = 32; + MtdPartition *partitions = malloc(nump * sizeof(*partitions)); + if (partitions == NULL) { + errno = ENOMEM; + return -1; + } + g_mtd_state.partitions = partitions; + g_mtd_state.partitions_allocd = nump; + memset(partitions, 0, nump * sizeof(*partitions)); + } + g_mtd_state.partition_count = 0; + + /* Initialize all of the entries to make things easier later. + * (Lets us handle sparsely-numbered partitions, which + * may not even be possible.) + */ + for (i = 0; i < g_mtd_state.partitions_allocd; i++) { + MtdPartition *p = &g_mtd_state.partitions[i]; + if (p->name != NULL) { + free(p->name); + p->name = NULL; + } + p->device_index = -1; + } + + /* Open and read the file contents. + */ + fd = open(MTD_PROC_FILENAME, O_RDONLY); + if (fd < 0) { + goto bail; + } + nbytes = TEMP_FAILURE_RETRY(read(fd, buf, sizeof(buf) - 1)); + close(fd); + if (nbytes < 0) { + goto bail; + } + buf[nbytes] = '\0'; + + /* Parse the contents of the file, which looks like: + * + * # cat /proc/mtd + * dev: size erasesize name + * mtd0: 00080000 00020000 "bootloader" + * mtd1: 00400000 00020000 "mfg_and_gsm" + * mtd2: 00400000 00020000 "0000000c" + * mtd3: 00200000 00020000 "0000000d" + * mtd4: 04000000 00020000 "system" + * mtd5: 03280000 00020000 "userdata" + */ + bufp = buf; + while (nbytes > 0) { + int mtdnum, mtdsize, mtderasesize; + int matches; + char mtdname[64]; + mtdname[0] = '\0'; + mtdnum = -1; + + matches = sscanf(bufp, "mtd%d: %x %x \"%63[^\"]", + &mtdnum, &mtdsize, &mtderasesize, mtdname); + /* This will fail on the first line, which just contains + * column headers. + */ + if (matches == 4) { + MtdPartition *p = &g_mtd_state.partitions[mtdnum]; + p->device_index = mtdnum; + p->size = mtdsize; + p->erase_size = mtderasesize; +#ifdef BYNAME + asprintf(&p->name, "%s%s", mtdprefix, mtdname); +#else + p->name = strdup(mtdname); +#endif + if (p->name == NULL) { + errno = ENOMEM; + goto bail; + } + g_mtd_state.partition_count++; + } + + /* Eat the line. + */ + while (nbytes > 0 && *bufp != '\n') { + bufp++; + nbytes--; + } + if (nbytes > 0) { + bufp++; + nbytes--; + } + } + + return g_mtd_state.partition_count; + +bail: + // keep "partitions" around so we can free the names on a rescan. + g_mtd_state.partition_count = -1; + return -1; +} + +const MtdPartition * +mtd_find_partition_by_name(const char *name) +{ + if (g_mtd_state.partitions != NULL) { + int i; + for (i = 0; i < g_mtd_state.partitions_allocd; i++) { + MtdPartition *p = &g_mtd_state.partitions[i]; + if (p->device_index >= 0 && p->name != NULL) { + if (strcmp(p->name, name) == 0) { + return p; + } +#ifdef BYNAME + if (strcmp(p->name+MTD_BASENAME_OFFSET, name) == 0) { + return p; + } +#endif + } + } + } + return NULL; +} + +int +mtd_mount_partition(const MtdPartition *partition, const char *mount_point, + const char *filesystem, int read_only) +{ + const unsigned long flags = MS_NOATIME | MS_NODEV | MS_NODIRATIME; + char devname[64]; + int rv = -1; + + sprintf(devname, "/dev/block/mtdblock%d", partition->device_index); + if (!read_only) { + rv = mount(devname, mount_point, filesystem, flags, NULL); + } + if (read_only || rv < 0) { + rv = mount(devname, mount_point, filesystem, flags | MS_RDONLY, 0); + if (rv < 0) { + printf("Failed to mount %s on %s: %s\n", + devname, mount_point, strerror(errno)); + } else { + printf("Mount %s on %s read-only\n", devname, mount_point); + } + } +#if 1 //TODO: figure out why this is happening; remove include of stat.h + if (rv >= 0) { + /* For some reason, the x bits sometimes aren't set on the root + * of mounted volumes. + */ + struct stat st; + rv = stat(mount_point, &st); + if (rv < 0) { + return rv; + } + mode_t new_mode = st.st_mode | S_IXUSR | S_IXGRP | S_IXOTH; + if (new_mode != st.st_mode) { +printf("Fixing execute permissions for %s\n", mount_point); + rv = chmod(mount_point, new_mode); + if (rv < 0) { + printf("Couldn't fix permissions for %s: %s\n", + mount_point, strerror(errno)); + } + } + } +#endif + return rv; +} + +int +mtd_partition_info(const MtdPartition *partition, + size_t *total_size, size_t *erase_size, size_t *write_size) +{ + char mtddevname[32]; + sprintf(mtddevname, "/dev/mtd/mtd%d", partition->device_index); + int fd = open(mtddevname, O_RDONLY); + if (fd < 0) return -1; + + struct mtd_info_user mtd_info; + int ret = ioctl(fd, MEMGETINFO, &mtd_info); + close(fd); + if (ret < 0) return -1; + + if (total_size != NULL) *total_size = mtd_info.size; + if (erase_size != NULL) *erase_size = mtd_info.erasesize; + if (write_size != NULL) *write_size = mtd_info.writesize; + return 0; +} + +MtdReadContext *mtd_read_partition(const MtdPartition *partition) +{ + MtdReadContext *ctx = (MtdReadContext*) malloc(sizeof(MtdReadContext)); + if (ctx == NULL) return NULL; + + ctx->buffer = malloc(partition->erase_size); + if (ctx->buffer == NULL) { + free(ctx); + return NULL; + } + + char mtddevname[32]; + sprintf(mtddevname, "/dev/mtd/mtd%d", partition->device_index); + ctx->fd = open(mtddevname, O_RDONLY); + if (ctx->fd < 0) { + free(ctx->buffer); + free(ctx); + return NULL; + } + + ctx->partition = partition; + ctx->consumed = partition->erase_size; + return ctx; +} + +static int read_block(const MtdPartition *partition, int fd, char *data) +{ + struct mtd_ecc_stats before, after; + if (ioctl(fd, ECCGETSTATS, &before)) { + printf("mtd: ECCGETSTATS error (%s)\n", strerror(errno)); + return -1; + } + + loff_t pos = TEMP_FAILURE_RETRY(lseek64(fd, 0, SEEK_CUR)); + if (pos == -1) { + printf("mtd: read_block: couldn't SEEK_CUR: %s\n", strerror(errno)); + return -1; + } + + ssize_t size = partition->erase_size; + int mgbb; + + while (pos + size <= (int) partition->size) { + if (TEMP_FAILURE_RETRY(lseek64(fd, pos, SEEK_SET)) != pos || + TEMP_FAILURE_RETRY(read(fd, data, size)) != size) { + printf("mtd: read error at 0x%08llx (%s)\n", + (long long)pos, strerror(errno)); + } else if (ioctl(fd, ECCGETSTATS, &after)) { + printf("mtd: ECCGETSTATS error (%s)\n", strerror(errno)); + return -1; + } else if (after.failed != before.failed) { + printf("mtd: ECC errors (%d soft, %d hard) at 0x%08llx\n", + after.corrected - before.corrected, + after.failed - before.failed, (long long)pos); + // copy the comparison baseline for the next read. + memcpy(&before, &after, sizeof(struct mtd_ecc_stats)); + } else if ((mgbb = ioctl(fd, MEMGETBADBLOCK, &pos))) { + fprintf(stderr, + "mtd: MEMGETBADBLOCK returned %d at 0x%08llx: %s\n", + mgbb, (long long)pos, strerror(errno)); + } else { + return 0; // Success! + } + + pos += partition->erase_size; + } + + errno = ENOSPC; + return -1; +} + +ssize_t mtd_read_data(MtdReadContext *ctx, char *data, size_t len) +{ + ssize_t read = 0; + while (read < (int) len) { + if (ctx->consumed < ctx->partition->erase_size) { + size_t avail = ctx->partition->erase_size - ctx->consumed; + size_t copy = len - read < avail ? len - read : avail; + memcpy(data + read, ctx->buffer + ctx->consumed, copy); + ctx->consumed += copy; + read += copy; + } + + // Read complete blocks directly into the user's buffer + while (ctx->consumed == ctx->partition->erase_size && + len - read >= ctx->partition->erase_size) { + if (read_block(ctx->partition, ctx->fd, data + read)) return -1; + read += ctx->partition->erase_size; + } + + if (read >= (int)len) { + return read; + } + + // Read the next block into the buffer + if (ctx->consumed == ctx->partition->erase_size && read < (int) len) { + if (read_block(ctx->partition, ctx->fd, ctx->buffer)) return -1; + ctx->consumed = 0; + } + } + + return read; +} + +void mtd_read_close(MtdReadContext *ctx) +{ + close(ctx->fd); + free(ctx->buffer); + free(ctx); +} + +MtdWriteContext *mtd_write_partition(const MtdPartition *partition) +{ + MtdWriteContext *ctx = (MtdWriteContext*) malloc(sizeof(MtdWriteContext)); + if (ctx == NULL) return NULL; + + ctx->bad_block_offsets = NULL; + ctx->bad_block_alloc = 0; + ctx->bad_block_count = 0; + + ctx->buffer = malloc(partition->erase_size); + if (ctx->buffer == NULL) { + free(ctx); + return NULL; + } + + char mtddevname[32]; + sprintf(mtddevname, "/dev/mtd/mtd%d", partition->device_index); + ctx->fd = open(mtddevname, O_RDWR); + if (ctx->fd < 0) { + free(ctx->buffer); + free(ctx); + return NULL; + } + + ctx->partition = partition; + ctx->stored = 0; + return ctx; +} + +static void add_bad_block_offset(MtdWriteContext *ctx, off_t pos) { + if (ctx->bad_block_count + 1 > ctx->bad_block_alloc) { + ctx->bad_block_alloc = (ctx->bad_block_alloc*2) + 1; + ctx->bad_block_offsets = realloc(ctx->bad_block_offsets, + ctx->bad_block_alloc * sizeof(off_t)); + } + ctx->bad_block_offsets[ctx->bad_block_count++] = pos; +} + +static int write_block(MtdWriteContext *ctx, const char *data) +{ + const MtdPartition *partition = ctx->partition; + int fd = ctx->fd; + + off_t pos = TEMP_FAILURE_RETRY(lseek(fd, 0, SEEK_CUR)); + if (pos == (off_t) -1) { + printf("mtd: write_block: couldn't SEEK_CUR: %s\n", strerror(errno)); + return -1; + } + + ssize_t size = partition->erase_size; + while (pos + size <= (int) partition->size) { + loff_t bpos = pos; + int ret = ioctl(fd, MEMGETBADBLOCK, &bpos); + if (ret != 0 && !(ret == -1 && errno == EOPNOTSUPP)) { + add_bad_block_offset(ctx, pos); + fprintf(stderr, + "mtd: not writing bad block at 0x%08lx (ret %d): %s\n", + pos, ret, strerror(errno)); + pos += partition->erase_size; + continue; // Don't try to erase known factory-bad blocks. + } + + struct erase_info_user erase_info; + erase_info.start = pos; + erase_info.length = size; + int retry; + for (retry = 0; retry < 2; ++retry) { +#ifdef RK3X + if (rk30_zero_out(fd, pos, size) < 0) { + fprintf(stderr, "mtd: erase failure at 0x%08lx (%s)\n", + pos, strerror(errno)); + continue; + } +#else + if (ioctl(fd, MEMERASE, &erase_info) < 0) { + printf("mtd: erase failure at 0x%08lx (%s)\n", + pos, strerror(errno)); + continue; + } +#endif + if (TEMP_FAILURE_RETRY(lseek(fd, pos, SEEK_SET)) != pos || + TEMP_FAILURE_RETRY(write(fd, data, size)) != size) { + printf("mtd: write error at 0x%08lx (%s)\n", + pos, strerror(errno)); + } + + char verify[size]; + if (TEMP_FAILURE_RETRY(lseek(fd, pos, SEEK_SET)) != pos || + TEMP_FAILURE_RETRY(read(fd, verify, size)) != size) { + printf("mtd: re-read error at 0x%08lx (%s)\n", + pos, strerror(errno)); + continue; + } + if (memcmp(data, verify, size) != 0) { + printf("mtd: verification error at 0x%08lx (%s)\n", + pos, strerror(errno)); + continue; + } + + if (retry > 0) { + printf("mtd: wrote block after %d retries\n", retry); + } + printf("mtd: successfully wrote block at %lx\n", pos); + return 0; // Success! + } + + // Try to erase it once more as we give up on this block + add_bad_block_offset(ctx, pos); + printf("mtd: skipping write block at 0x%08lx\n", pos); +#ifdef RK3X + rk30_zero_out(fd, pos, size); +#else + + ioctl(fd, MEMERASE, &erase_info); +#endif + pos += partition->erase_size; + } + + // Ran out of space on the device + errno = ENOSPC; + return -1; +} + +ssize_t mtd_write_data(MtdWriteContext *ctx, const char *data, size_t len) +{ + size_t wrote = 0; + while (wrote < len) { + // Coalesce partial writes into complete blocks + if (ctx->stored > 0 || len - wrote < ctx->partition->erase_size) { + size_t avail = ctx->partition->erase_size - ctx->stored; + size_t copy = len - wrote < avail ? len - wrote : avail; + memcpy(ctx->buffer + ctx->stored, data + wrote, copy); + ctx->stored += copy; + wrote += copy; + } + + // If a complete block was accumulated, write it + if (ctx->stored == ctx->partition->erase_size) { + if (write_block(ctx, ctx->buffer)) return -1; + ctx->stored = 0; + } + + // Write complete blocks directly from the user's buffer + while (ctx->stored == 0 && len - wrote >= ctx->partition->erase_size) { + if (write_block(ctx, data + wrote)) return -1; + wrote += ctx->partition->erase_size; + } + } + + return wrote; +} + +off_t mtd_erase_blocks(MtdWriteContext *ctx, int blocks) +{ + // Zero-pad and write any pending data to get us to a block boundary + if (ctx->stored > 0) { + size_t zero = ctx->partition->erase_size - ctx->stored; + memset(ctx->buffer + ctx->stored, 0, zero); + if (write_block(ctx, ctx->buffer)) return -1; + ctx->stored = 0; + } + + off_t pos = TEMP_FAILURE_RETRY(lseek(ctx->fd, 0, SEEK_CUR)); + if ((off_t) pos == (off_t) -1) { + printf("mtd_erase_blocks: couldn't SEEK_CUR: %s\n", strerror(errno)); + return -1; + } + + const int total = (ctx->partition->size - pos) / ctx->partition->erase_size; + if (blocks < 0) blocks = total; + if (blocks > total) { + errno = ENOSPC; + return -1; + } + + // Erase the specified number of blocks + while (blocks-- > 0) { + loff_t bpos = pos; + if (ioctl(ctx->fd, MEMGETBADBLOCK, &bpos) > 0) { + printf("mtd: not erasing bad block at 0x%08lx\n", pos); + pos += ctx->partition->erase_size; + continue; // Don't try to erase known factory-bad blocks. + } + + struct erase_info_user erase_info; + erase_info.start = pos; + erase_info.length = ctx->partition->erase_size; +#ifdef RK3X + if (rk30_zero_out(ctx->fd, pos, ctx->partition->erase_size) < 0) { + fprintf(stderr, "mtd: erase failure at 0x%08lx\n", pos); + } +#else + if (ioctl(ctx->fd, MEMERASE, &erase_info) < 0) { + printf("mtd: erase failure at 0x%08lx\n", pos); + } +#endif + pos += ctx->partition->erase_size; + } + + return pos; +} + +int mtd_write_close(MtdWriteContext *ctx) +{ + int r = 0; + // Make sure any pending data gets written + if (mtd_erase_blocks(ctx, 0) == (off_t) -1) r = -1; + if (close(ctx->fd)) r = -1; + free(ctx->bad_block_offsets); + free(ctx->buffer); + free(ctx); + return r; +} + +/* Return the offset of the first good block at or after pos (which + * might be pos itself). + */ +off_t mtd_find_write_start(MtdWriteContext *ctx, off_t pos) { + int i; + for (i = 0; i < ctx->bad_block_count; ++i) { + if (ctx->bad_block_offsets[i] == pos) { + pos += ctx->partition->erase_size; + } else if (ctx->bad_block_offsets[i] > pos) { + return pos; + } + } + return pos; +} + +#define BLOCK_SIZE 2048 +#define SPARE_SIZE (BLOCK_SIZE >> 5) +#define HEADER_SIZE 2048 + +int cmd_mtd_restore_raw_partition(const char *partition_name, const char *filename) +{ + const MtdPartition *ptn; + MtdWriteContext *write; + void *data; + + FILE* f = fopen(filename, "rb"); + if (f == NULL) { + fprintf(stderr, "error opening %s", filename); + return -1; + } + + if (mtd_scan_partitions() <= 0) + { + fprintf(stderr, "error scanning partitions"); + return -1; + } + const MtdPartition *mtd = mtd_find_partition_by_name(partition_name); + if (mtd == NULL) + { + fprintf(stderr, "can't find %s partition", partition_name); + return -1; + } + + int fd = open(filename, O_RDONLY); + if (fd < 0) + { + printf("error opening %s", filename); + return -1; + } + + MtdWriteContext* ctx = mtd_write_partition(mtd); + if (ctx == NULL) { + printf("error writing %s", partition_name); + return -1; + } + + int success = 1; + char* buffer = malloc(BUFSIZ); + int read; + while (success && (read = fread(buffer, 1, BUFSIZ, f)) > 0) { + int wrote = mtd_write_data(ctx, buffer, read); + success = success && (wrote == read); + } + free(buffer); + fclose(f); + + if (!success) { + fprintf(stderr, "error writing %s", partition_name); + return -1; + } + + if (mtd_erase_blocks(ctx, -1) == -1) { + fprintf(stderr, "error erasing blocks of %s\n", partition_name); + } + if (mtd_write_close(ctx) != 0) { + fprintf(stderr, "error closing write of %s\n", partition_name); + } + printf("%s %s partition\n", success ? "wrote" : "failed to write", partition_name); + return 0; +} + + +int cmd_mtd_backup_raw_partition(const char *partition_name, const char *filename) +{ + MtdReadContext *in; + const MtdPartition *partition; + char buf[BLOCK_SIZE + SPARE_SIZE]; + size_t partition_size; + size_t read_size; + size_t total; + int fd; + int wrote; + int len; + + if (mtd_scan_partitions() <= 0) + { + printf("error scanning partitions"); + return -1; + } + + partition = mtd_find_partition_by_name(partition_name); + if (partition == NULL) + { + printf("can't find %s partition", partition_name); + return -1; + } + + if (mtd_partition_info(partition, &partition_size, NULL, NULL)) { + printf("can't get info of partition %s", partition_name); + return -1; + } + + if (!strcmp(filename, "-")) { + fd = fileno(stdout); + } + else { + fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0666); + } + + if (fd < 0) + { + printf("error opening %s", filename); + return -1; + } + + in = mtd_read_partition(partition); + if (in == NULL) { + close(fd); + unlink(filename); + printf("error opening %s: %s\n", partition_name, strerror(errno)); + return -1; + } + + total = 0; + while ((len = mtd_read_data(in, buf, BLOCK_SIZE)) > 0) { + wrote = write(fd, buf, len); + if (wrote != len) { + close(fd); + unlink(filename); + printf("error writing %s", filename); + return -1; + } + total += BLOCK_SIZE; + } + + mtd_read_close(in); + + if (close(fd)) { + unlink(filename); + printf("error closing %s", filename); + return -1; + } + return 0; +} + +int cmd_mtd_erase_raw_partition(const char *partition_name) +{ + MtdWriteContext *out; + size_t erased; + size_t total_size; + size_t erase_size; + + if (mtd_scan_partitions() <= 0) + { + printf("error scanning partitions"); + return -1; + } + const MtdPartition *p = mtd_find_partition_by_name(partition_name); + if (p == NULL) + { + printf("can't find %s partition", partition_name); + return -1; + } + + out = mtd_write_partition(p); + if (out == NULL) + { + printf("could not estabilish write context for %s", partition_name); + return -1; + } + + // do the actual erase, -1 = full partition erase + erased = mtd_erase_blocks(out, -1); + + // erased = bytes erased, if zero, something borked + if (!erased) + { + printf("error erasing %s", partition_name); + return -1; + } + + return 0; +} + +int cmd_mtd_erase_partition(const char *partition, const char *filesystem) +{ + return cmd_mtd_erase_raw_partition(partition); +} + + +int cmd_mtd_mount_partition(const char *partition, const char *mount_point, const char *filesystem, int read_only) +{ + mtd_scan_partitions(); + const MtdPartition *p; + p = mtd_find_partition_by_name(partition); + if (p == NULL) { + return -1; + } + return mtd_mount_partition(p, mount_point, filesystem, read_only); +} + +int cmd_mtd_get_partition_device(const char *partition, char *device) +{ + mtd_scan_partitions(); + MtdPartition *p = mtd_find_partition_by_name(partition); + if (p == NULL) + return -1; + sprintf(device, "/dev/block/mtdblock%d", p->device_index); + return 0; +}
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