disk: part: implement generic function part_get_info_by_name()

So far partition search by name has been supported only on the EFI partition
table. This patch extends the search to all partition tables.

Rename part_get_info_efi_by_name() to part_get_info_by_name(), move it from
part_efi.c into part.c and make it a generic function which traverses all part
drivers and searches all partitions (in the order given by the linked list).

For this a new variable struct part_driver.max_entries is added, which limits
the number of partitions searched. For EFI this was GPT_ENTRY_NUMBERS.
Similarly the limit is defined for DOS, ISO, MAC and AMIGA partition tables.

Signed-off-by: Petr Kulhavy <brain@jikos.cz>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Steve Rae <steve.rae@raedomain.com>

common/fb_mmc.c

@@ -27,7 +27,7 @@ static int part_get_info_efi_by_name_or_alias(struct blk_desc *dev_desc,
 {
 	int ret;
 
-	ret = part_get_info_efi_by_name(dev_desc, name, info);
+	ret = part_get_info_by_name(dev_desc, name, info);
 	if (ret) {
 		/* strlen("fastboot_partition_alias_") + 32(part_name) + 1 */
 		char env_alias_name[25 + 32 + 1];
@@ -38,7 +38,7 @@ static int part_get_info_efi_by_name_or_alias(struct blk_desc *dev_desc,
 		strncat(env_alias_name, name, 32);
 		aliased_part_name = getenv(env_alias_name);
 		if (aliased_part_name != NULL)
-			ret = part_get_info_efi_by_name(dev_desc,
+			ret = part_get_info_by_name(dev_desc,
 					aliased_part_name, info);
 	}
 	return ret;

disk/part.c

@@ -615,3 +615,29 @@ cleanup:
 	free(dup_str);
 	return ret;
 }
+
+int part_get_info_by_name(struct blk_desc *dev_desc, const char *name,
+	disk_partition_t *info)
+{
+	struct part_driver *first_drv =
+		ll_entry_start(struct part_driver, part_driver);
+	const int n_drvs = ll_entry_count(struct part_driver, part_driver);
+	struct part_driver *part_drv;
+
+	for (part_drv = first_drv; part_drv != first_drv + n_drvs; part_drv++) {
+		int ret;
+		int i;
+		for (i = 1; i < part_drv->max_entries; i++) {
+			ret = part_drv->get_info(dev_desc, i, info);
+			if (ret != 0) {
+				/* no more entries in table */
+				break;
+			}
+			if (strcmp(name, (const char *)info->name) == 0) {
+				/* matched */
+				return 0;
+			}
+		}
+	}
+	return -1;
+}

disk/part_amiga.c

@@ -381,6 +381,7 @@ static void part_print_amiga(struct blk_desc *dev_desc)
 U_BOOT_PART_TYPE(amiga) = {
 	.name		= "AMIGA",
 	.part_type	= PART_TYPE_AMIGA,
+	.max_entries	= AMIGA_ENTRY_NUMBERS,
 	.get_info	= part_get_info_amiga,
 	.print		= part_print_amiga,
 	.test		= part_test_amiga,

disk/part_dos.c

@@ -300,6 +300,7 @@ int part_get_info_dos(struct blk_desc *dev_desc, int part,
 U_BOOT_PART_TYPE(dos) = {
 	.name		= "DOS",
 	.part_type	= PART_TYPE_DOS,
+	.max_entries	= DOS_ENTRY_NUMBERS,
 	.get_info	= part_get_info_ptr(part_get_info_dos),
 	.print		= part_print_ptr(part_print_dos),
 	.test		= part_test_dos,

disk/part_efi.c

@@ -296,25 +296,6 @@ int part_get_info_efi(struct blk_desc *dev_desc, int part,
 	return 0;
 }
 
-int part_get_info_efi_by_name(struct blk_desc *dev_desc,
-	const char *name, disk_partition_t *info)
-{
-	int ret;
-	int i;
-	for (i = 1; i < GPT_ENTRY_NUMBERS; i++) {
-		ret = part_get_info_efi(dev_desc, i, info);
-		if (ret != 0) {
-			/* no more entries in table */
-			return -1;
-		}
-		if (strcmp(name, (const char *)info->name) == 0) {
-			/* matched */
-			return 0;
-		}
-	}
-	return -2;
-}
-
 static int part_test_efi(struct blk_desc *dev_desc)
 {
 	ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);
@@ -958,6 +939,7 @@ static int is_pte_valid(gpt_entry * pte)
 U_BOOT_PART_TYPE(a_efi) = {
 	.name		= "EFI",
 	.part_type	= PART_TYPE_EFI,
+	.max_entries	= GPT_ENTRY_NUMBERS,
 	.get_info	= part_get_info_ptr(part_get_info_efi),
 	.print		= part_print_ptr(part_print_efi),
 	.test		= part_test_efi,

disk/part_iso.c

@@ -257,6 +257,7 @@ static int part_test_iso(struct blk_desc *dev_desc)
 U_BOOT_PART_TYPE(iso) = {
 	.name		= "ISO",
 	.part_type	= PART_TYPE_ISO,
+	.max_entries	= ISO_ENTRY_NUMBERS,
 	.get_info	= part_get_info_iso,
 	.print		= part_print_iso,
 	.test		= part_test_iso,

disk/part_mac.c

@@ -239,6 +239,7 @@ static int part_get_info_mac(struct blk_desc *dev_desc, int part,
 U_BOOT_PART_TYPE(mac) = {
 	.name		= "MAC",
 	.part_type	= PART_TYPE_MAC,
+	.max_entries	= MAC_ENTRY_NUMBERS,
 	.get_info	= part_get_info_mac,
 	.print		= part_print_mac,
 	.test		= part_test_mac,

include/part.h

@@ -28,6 +28,11 @@ struct block_drvr {
 #define PART_TYPE_AMIGA		0x04
 #define PART_TYPE_EFI		0x05
 
+/* maximum number of partition entries supported by search */
+#define DOS_ENTRY_NUMBERS	8
+#define ISO_ENTRY_NUMBERS	64
+#define MAC_ENTRY_NUMBERS	64
+#define AMIGA_ENTRY_NUMBERS	8
 /*
  * Type string for U-Boot bootable partitions
  */
@@ -146,6 +151,20 @@ int blk_get_device_by_str(const char *ifname, const char *dev_str,
 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 			    struct blk_desc **dev_desc,
 			    disk_partition_t *info, int allow_whole_dev);
+
+/**
+ * part_get_info_by_name() - Search for a partition by name
+ *                           among all available registered partitions
+ *
+ * @param dev_desc - block device descriptor
+ * @param gpt_name - the specified table entry name
+ * @param info - returns the disk partition info
+ *
+ * @return - '0' on match, '-1' on no match, otherwise error
+ */
+int part_get_info_by_name(struct blk_desc *dev_desc,
+			      const char *name, disk_partition_t *info);
+
 extern const struct block_drvr block_drvr[];
 #else
 static inline struct blk_desc *blk_get_dev(const char *ifname, int dev)
@@ -189,6 +208,7 @@ static inline int blk_get_device_part_str(const char *ifname,
 struct part_driver {
 	const char *name;
 	int part_type;
+	const int max_entries;	/* maximum number of entries to search */
 
 	/**
 	 * get_info() - Get information about a partition
@@ -224,18 +244,6 @@ struct part_driver {
 #ifdef CONFIG_EFI_PARTITION
 #include <part_efi.h>
 /* disk/part_efi.c */
-/**
- * part_get_info_efi_by_name() - Find the specified GPT partition table entry
- *
- * @param dev_desc - block device descriptor
- * @param gpt_name - the specified table entry name
- * @param info - returns the disk partition info
- *
- * @return - '0' on match, '-1' on no match, otherwise error
- */
-int part_get_info_efi_by_name(struct blk_desc *dev_desc,
-			      const char *name, disk_partition_t *info);
-
 /**
  * write_gpt_table() - Write the GUID Partition Table to disk
  *