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authorAlison Chaiken <alison@peloton-tech.com>2017-07-04 11:18:50 -0700
committerTom Rini <trini@konsulko.com>2017-08-04 20:34:04 -0400
commit09a49930e4154974dd918ed42d129d50c110c45a (patch)
tree946d405a2ced9e90870f505e4a870ffcf5a76c5b /cmd/gpt.c
parent73d6d18b7147c90d6f8a60acb8dad663a225e63d (diff)
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 <alison@peloton-tech.com> [trini: Make this depend on CMD_GPT_RENAME, as it is the user of this code] Signed-off-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'cmd/gpt.c')
-rw-r--r--cmd/gpt.c125
1 files changed, 125 insertions, 0 deletions
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 <linux/ctype.h>
#include <div64.h>
#include <memalign.h>
+#include <linux/compat.h>
+
+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 <interface> <dev>\n"
+ " - read GPT into a data structure for manipulation\n"
" guid <interface> <dev>\n"
" - print disk GUID\n"
" guid <interface> <dev> <varname>\n"