+++ /dev/null
-From 1a0915be192606fee64830b9c5d70b7ed59426b6 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
-Date: Wed, 21 Jun 2017 08:26:46 +0200
-Subject: [PATCH] mtd: partitions: add support for partition parsers
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Some devices have partitions that are kind of containers with extra
-subpartitions / volumes instead of e.g. a simple filesystem data. To
-support such cases we need to first create normal flash device
-partitions and then take care of these special ones.
-
-It's very common case for home routers. Depending on the vendor there
-are formats like TRX, Seama, TP-Link, WRGG & more. All of them are used
-to embed few partitions into a single one / single firmware file.
-
-Ideally all vendors would use some well documented / standardized format
-like UBI (and some probably start doing so), but there are still
-countless devices on the market using these poor vendor specific
-formats.
-
-This patch extends MTD subsystem by allowing to specify list of parsers
-that should be tried for a given partition. Supporting such poor formats
-is highly unlikely to be the top priority so these changes try to
-minimize maintenance cost to the minimum. It reuses existing code for
-these new parsers and just adds a one property and one new function.
-
-This implementation requires setting partition parsers in a flash
-parser. A proper change of bcm47xxpart will follow and in the future we
-will hopefully also find a solution for doing it with ofpart
-("fixed-partitions").
-
-Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
-Signed-off-by: Brian Norris <computersforpeace@gmail.com>
----
- drivers/mtd/mtdpart.c | 31 +++++++++++++++++++++++++++++++
- include/linux/mtd/partitions.h | 7 +++++++
- 2 files changed, 38 insertions(+)
-
---- a/drivers/mtd/mtdpart.c
-+++ b/drivers/mtd/mtdpart.c
-@@ -369,6 +369,35 @@ static inline void free_partition(struct
- kfree(p);
- }
-
-+/**
-+ * mtd_parse_part - parse MTD partition looking for subpartitions
-+ *
-+ * @slave: part that is supposed to be a container and should be parsed
-+ * @types: NULL-terminated array with names of partition parsers to try
-+ *
-+ * Some partitions are kind of containers with extra subpartitions (volumes).
-+ * There can be various formats of such containers. This function tries to use
-+ * specified parsers to analyze given partition and registers found
-+ * subpartitions on success.
-+ */
-+static int mtd_parse_part(struct mtd_part *slave, const char *const *types)
-+{
-+ struct mtd_partitions parsed;
-+ int err;
-+
-+ err = parse_mtd_partitions(&slave->mtd, types, &parsed, NULL);
-+ if (err)
-+ return err;
-+ else if (!parsed.nr_parts)
-+ return -ENOENT;
-+
-+ err = add_mtd_partitions(&slave->mtd, parsed.parts, parsed.nr_parts);
-+
-+ mtd_part_parser_cleanup(&parsed);
-+
-+ return err;
-+}
-+
- static struct mtd_part *allocate_partition(struct mtd_info *parent,
- const struct mtd_partition *part, int partno,
- uint64_t cur_offset)
-@@ -778,6 +807,8 @@ int add_mtd_partitions(struct mtd_info *
- }
-
- mtd_add_partition_attrs(slave);
-+ if (parts[i].types)
-+ mtd_parse_part(slave, parts[i].types);
-
- cur_offset = slave->offset + slave->mtd.size;
- }
---- a/include/linux/mtd/partitions.h
-+++ b/include/linux/mtd/partitions.h
-@@ -20,6 +20,12 @@
- *
- * For each partition, these fields are available:
- * name: string that will be used to label the partition's MTD device.
-+ * types: some partitions can be containers using specific format to describe
-+ * embedded subpartitions / volumes. E.g. many home routers use "firmware"
-+ * partition that contains at least kernel and rootfs. In such case an
-+ * extra parser is needed that will detect these dynamic partitions and
-+ * report them to the MTD subsystem. If set this property stores an array
-+ * of parser names to use when looking for subpartitions.
- * size: the partition size; if defined as MTDPART_SIZ_FULL, the partition
- * will extend to the end of the master MTD device.
- * offset: absolute starting position within the master MTD device; if
-@@ -38,6 +44,7 @@
-
- struct mtd_partition {
- const char *name; /* identifier string */
-+ const char *const *types; /* names of parsers to use if any */
- uint64_t size; /* partition size */
- uint64_t offset; /* offset within the master MTD space */
- uint32_t mask_flags; /* master MTD flags to mask out for this partition */
projects / openwrt / staging / dedeckeh.git / blobdiff