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>

1 files changed, 20 insertions, 12 deletions

diff --git a/include/part.h b/include/part.h
index 226b5be..bd8fd49 100644
--- a/include/part.h
+++ b/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
@@ -225,18 +245,6 @@ struct part_driver {
 #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
  *
  * @param dev_desc - block device descriptor