disk: part: implement generic function part_get_info_by_uuid()

Add function to search for a partition by UUID as partition
names may not be unique.

Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
Acked-by: Casey Connolly <casey.connolly@linaro.org>

diff --git a/disk/part.c b/disk/part.c
index 303178161c083ec6e1b767b4f06ac5773576ca60..8eefda39d7bb6aaad4979771966bfc189493a08e 100644 (file)
--- a/disk/part.c
+++ b/disk/part.c
@@ -698,6 +698,45 @@ int part_get_info_by_name(struct blk_desc *desc, const char *name,
        return -ENOENT;
 }
 
+int part_get_info_by_uuid(struct blk_desc *desc, const char *uuid,
+                         struct disk_partition *info)
+{
+       struct part_driver *part_drv;
+       int ret;
+       int i;
+
+       if (!CONFIG_IS_ENABLED(PARTITION_UUIDS))
+               return -ENOENT;
+
+       part_drv = part_driver_lookup_type(desc);
+       if (!part_drv)
+               return -1;
+
+       if (!part_drv->get_info) {
+               log_debug("## Driver %s does not have the get_info() method\n",
+                         part_drv->name);
+               return -ENOSYS;
+       }
+
+       for (i = 1; i < part_drv->max_entries; i++) {
+               ret = part_drv->get_info(desc, i, info);
+               if (ret != 0) {
+                       /*
+                        * Partition with this index can't be obtained, but
+                        * further partitions might be, so keep checking.
+                        */
+                       continue;
+               }
+
+               if (!strncasecmp(uuid, disk_partition_uuid(info), UUID_STR_LEN)) {
+                       /* matched */
+                       return i;
+               }
+       }
+
+       return -ENOENT;
+}
+
 /**
  * Get partition info from device number and partition name.
  *

diff --git a/include/part.h b/include/part.h
index fcb3c13dea4de6346ad98d6ce320ef36747dda85..3e6eb0ec33f16079b24f0c13b7642905044cf2c3 100644 (file)
--- a/include/part.h
+++ b/include/part.h
@@ -315,6 +315,20 @@ int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 int part_get_info_by_name(struct blk_desc *desc, const char *name,
                          struct disk_partition *info);
 
+/**
+ * part_get_info_by_uuid() - Search for a partition by uuid
+ *                           among all available registered partitions
+ *
+ * @desc:      block device descriptor
+ * @uuid:      the specified table entry uuid
+ * @info:      the disk partition info
+ *
+ * Return: the partition number on match (starting on 1), -ENOENT on no match,
+ * otherwise error
+ */
+int part_get_info_by_uuid(struct blk_desc *desc, const char *uuid,
+                         struct disk_partition *info);
+
 /**
  * part_get_info_by_dev_and_name_or_num() - Get partition info from dev number
  *                                         and part name, or dev number and
@@ -386,6 +400,12 @@ static inline int part_get_info_by_name(struct blk_desc *desc, const char *name,
        return -ENOENT;
 }
 
+static inline int part_get_info_by_uuid(struct blk_desc *desc, const char *uuid,
+                                       struct disk_partition *info)
+{
+       return -ENOENT;
+}
+
 static inline int
 part_get_info_by_dev_and_name_or_num(const char *dev_iface,
                                     const char *dev_part_str,