From 74d00a8c3849c1340efd713eb94b786e304c201f Mon Sep 17 00:00:00 2001 From: John Crispin Date: Sun, 25 Dec 2016 20:11:34 +0100 Subject: kernel: split patches folder up into backport, pending and hack folders * properly format/comment all patches * merge debloat patches * merge Kconfig patches * merge swconfig patches * merge hotplug patches * drop 200-fix_localversion.patch - upstream * drop 222-arm_zimage_none.patch - unused * drop 252-mv_cesa_depends.patch - no longer required * drop 410-mtd-move-forward-declaration-of-struct-mtd_info.patch - unused * drop 661-fq_codel_keep_dropped_stats.patch - outdated * drop 702-phy_add_aneg_done_function.patch - upstream * drop 840-rtc7301.patch - unused * drop 841-rtc_pt7c4338.patch - upstream * drop 921-use_preinit_as_init.patch - unused * drop spio-gpio-old and gpio-mmc - unused Signed-off-by: John Crispin --- ...titions-add-support-for-partition-parsers.patch | 110 +++++++++++++++++++++ 1 file changed, 110 insertions(+) create mode 100644 target/linux/generic/backport-4.9/065-v4.13-0007-mtd-partitions-add-support-for-partition-parsers.patch (limited to 'target/linux/generic/backport-4.9/065-v4.13-0007-mtd-partitions-add-support-for-partition-parsers.patch') diff --git a/target/linux/generic/backport-4.9/065-v4.13-0007-mtd-partitions-add-support-for-partition-parsers.patch b/target/linux/generic/backport-4.9/065-v4.13-0007-mtd-partitions-add-support-for-partition-parsers.patch new file mode 100644 index 0000000000..a28ee316fa --- /dev/null +++ b/target/linux/generic/backport-4.9/065-v4.13-0007-mtd-partitions-add-support-for-partition-parsers.patch @@ -0,0 +1,110 @@ +From 1a0915be192606fee64830b9c5d70b7ed59426b6 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= +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 +Signed-off-by: Brian Norris +--- + 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) +@@ -758,6 +787,8 @@ int add_mtd_partitions(struct mtd_info * + + add_mtd_device(&slave->mtd); + 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 */ -- cgit v1.2.3