From 09a49930e4154974dd918ed42d129d50c110c45a Mon Sep 17 00:00:00 2001 From: Alison Chaiken Date: Tue, 4 Jul 2017 11:18:50 -0700 Subject: [PATCH] GPT: read partition table from device into a data structure Make the partition table available for modification by reading it from the user-specified device into a linked list. Provide an accessor function for command-line testing. Signed-off-by: Alison Chaiken [trini: Make this depend on CMD_GPT_RENAME, as it is the user of this code] Signed-off-by: Tom Rini --- cmd/gpt.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++ include/part.h | 7 +++ 2 files changed, 132 insertions(+) diff --git a/cmd/gpt.c b/cmd/gpt.c index 65fb80b3df..9c920fa320 100644 --- a/cmd/gpt.c +++ b/cmd/gpt.c @@ -19,6 +19,9 @@ #include #include #include +#include + +static LIST_HEAD(disk_partitions); /** * extract_env(): Expand env name from string format '&{env_name}' @@ -151,6 +154,122 @@ static bool found_key(const char *str, const char *key) return result; } +#ifdef CONFIG_CMD_GPT_RENAME +static void del_gpt_info(void) +{ + struct list_head *pos = &disk_partitions; + struct disk_part *curr; + while (!list_empty(pos)) { + curr = list_entry(pos->next, struct disk_part, list); + list_del(pos->next); + free(curr); + } +} + +static struct disk_part *allocate_disk_part(disk_partition_t *info, int partnum) +{ + struct disk_part *newpart; + newpart = malloc(sizeof(*newpart)); + if (!newpart) + return ERR_PTR(-ENOMEM); + memset(newpart, '\0', sizeof(newpart)); + + newpart->gpt_part_info.start = info->start; + newpart->gpt_part_info.size = info->size; + newpart->gpt_part_info.blksz = info->blksz; + strncpy((char *)newpart->gpt_part_info.name, (const char *)info->name, + PART_NAME_LEN); + newpart->gpt_part_info.name[PART_NAME_LEN - 1] = '\0'; + strncpy((char *)newpart->gpt_part_info.type, (const char *)info->type, + PART_TYPE_LEN); + newpart->gpt_part_info.type[PART_TYPE_LEN - 1] = '\0'; + newpart->gpt_part_info.bootable = info->bootable; +#ifdef CONFIG_PARTITION_UUIDS + strncpy(newpart->gpt_part_info.uuid, (const char *)info->uuid, + UUID_STR_LEN); + /* UUID_STR_LEN is correct, as uuid[]'s length is UUID_STR_LEN+1 chars */ + newpart->gpt_part_info.uuid[UUID_STR_LEN] = '\0'; +#endif + newpart->partnum = partnum; + + return newpart; +} + +static void print_gpt_info(void) +{ + struct list_head *pos; + struct disk_part *curr; + + list_for_each(pos, &disk_partitions) { + curr = list_entry(pos, struct disk_part, list); + printf("Partition %d:\n", curr->partnum); + printf("1st block %x, size %x\n", (unsigned)curr->gpt_part_info.start, + (unsigned)curr->gpt_part_info.size); + printf("Block size %lu, name %s\n", curr->gpt_part_info.blksz, + curr->gpt_part_info.name); + printf("Type %s, bootable %d\n", curr->gpt_part_info.type, + curr->gpt_part_info.bootable); +#ifdef CONFIG_PARTITION_UUIDS + printf("UUID %s\n", curr->gpt_part_info.uuid); +#endif + printf("\n"); + } +} + +/* + * read partition info into disk_partitions list where + * it can be printed or modified + */ +static int get_gpt_info(struct blk_desc *dev_desc) +{ + /* start partition numbering at 1, as U-Boot does */ + int valid_parts = 0, p, ret; + disk_partition_t info; + struct disk_part *new_disk_part; + + if (disk_partitions.next == NULL) + INIT_LIST_HEAD(&disk_partitions); + + for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) { + ret = part_get_info(dev_desc, p, &info); + if (ret) + continue; + + /* Add 1 here because counter is zero-based but p1 is + the first partition */ + new_disk_part = allocate_disk_part(&info, valid_parts+1); + if (IS_ERR(new_disk_part)) + goto out; + + list_add_tail(&new_disk_part->list, &disk_partitions); + valid_parts++; + } + if (valid_parts == 0) { + printf("** No valid partitions found **\n"); + goto out; + } + return valid_parts; + out: + if (valid_parts >= 1) + del_gpt_info(); + return -ENODEV; +} + +/* a wrapper to test get_gpt_info */ +static int do_get_gpt_info(struct blk_desc *dev_desc) +{ + int ret; + + ret = get_gpt_info(dev_desc); + if (ret > 0) { + print_gpt_info(); + del_gpt_info(); + return 0; + } + return ret; +} +#endif + /** * set_gpt_info(): Fill partition information from string * function allocates memory, remember to free! @@ -455,6 +574,10 @@ static int do_gpt(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) printf("Verify GPT: "); } else if (strcmp(argv[1], "guid") == 0) { ret = do_disk_guid(blk_dev_desc, argv[4]); +#ifdef CONFIG_CMD_GPT_RENAME + } else if (strcmp(argv[1], "read") == 0) { + ret = do_get_gpt_info(blk_dev_desc); +#endif } else { return CMD_RET_USAGE; } @@ -477,6 +600,8 @@ U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt, " Example usage:\n" " gpt write mmc 0 $partitions\n" " gpt verify mmc 0 $partitions\n" + " read \n" + " - read GPT into a data structure for manipulation\n" " guid \n" " - print disk GUID\n" " guid \n" diff --git a/include/part.h b/include/part.h index c41aa6adc2..0cd803a933 100644 --- a/include/part.h +++ b/include/part.h @@ -10,6 +10,7 @@ #include #include #include +#include struct block_drvr { char *name; @@ -69,6 +70,12 @@ typedef struct disk_partition { #endif } disk_partition_t; +struct disk_part { + int partnum; + disk_partition_t gpt_part_info; + struct list_head list; +}; + /* Misc _get_dev functions */ #ifdef CONFIG_PARTITIONS /** -- 2.39.5