From 69357074558daf6ff24c9f58714935e9e095a865 Mon Sep 17 00:00:00 2001
From: OpenWrt community <openwrt-devel@lists.openwrt.org>
Date: Wed, 13 Jul 2022 13:37:33 +0200
Subject: [PATCH] kernel: add block fit partition parser
---
block/blk.h | 2 ++
block/partitions/Kconfig | 7 +++++++
block/partitions/Makefile | 1 +
block/partitions/check.h | 3 +++
block/partitions/core.c | 17 +++++++++++++++++
block/partitions/efi.c | 8 ++++++++
block/partitions/efi.h | 3 +++
block/partitions/msdos.c | 10 ++++++++++
drivers/mtd/mtd_blkdevs.c | 2 ++
drivers/mtd/ubi/block.c | 3 +++
include/linux/msdos_partition.h | 1 +
11 files changed, 57 insertions(+)
--- a/block/blk.h
+++ b/block/blk.h
@@ -414,6 +414,8 @@ void blk_free_ext_minor(unsigned int min
#define ADDPART_FLAG_NONE 0
#define ADDPART_FLAG_RAID 1
#define ADDPART_FLAG_WHOLEDISK 2
+#define ADDPART_FLAG_READONLY 4
+#define ADDPART_FLAG_ROOTDEV 8
int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
sector_t length);
int bdev_del_partition(struct gendisk *disk, int partno);
--- a/block/partitions/Kconfig
+++ b/block/partitions/Kconfig
@@ -103,6 +103,13 @@ config ATARI_PARTITION
Say Y here if you would like to use hard disks under Linux which
were partitioned under the Atari OS.
+config FIT_PARTITION
+ bool "Flattened-Image-Tree (FIT) partition support" if PARTITION_ADVANCED
+ default n
+ help
+ Say Y here if your system needs to mount the filesystem part of
+ a Flattened-Image-Tree (FIT) image commonly used with Das U-Boot.
+
config IBM_PARTITION
bool "IBM disk label and partition support"
depends on PARTITION_ADVANCED && S390
--- a/block/partitions/Makefile
+++ b/block/partitions/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_ACORN_PARTITION) += acorn.o
obj-$(CONFIG_AMIGA_PARTITION) += amiga.o
obj-$(CONFIG_ATARI_PARTITION) += atari.o
obj-$(CONFIG_AIX_PARTITION) += aix.o
+obj-$(CONFIG_FIT_PARTITION) += fit.o
obj-$(CONFIG_CMDLINE_PARTITION) += cmdline.o
obj-$(CONFIG_MAC_PARTITION) += mac.o
obj-$(CONFIG_LDM_PARTITION) += ldm.o
--- a/block/partitions/check.h
+++ b/block/partitions/check.h
@@ -57,6 +57,7 @@ int amiga_partition(struct parsed_partit
int atari_partition(struct parsed_partitions *state);
int cmdline_partition(struct parsed_partitions *state);
int efi_partition(struct parsed_partitions *state);
+int fit_partition(struct parsed_partitions *state);
int ibm_partition(struct parsed_partitions *);
int karma_partition(struct parsed_partitions *state);
int ldm_partition(struct parsed_partitions *state);
@@ -67,3 +68,5 @@ int sgi_partition(struct parsed_partitio
int sun_partition(struct parsed_partitions *state);
int sysv68_partition(struct parsed_partitions *state);
int ultrix_partition(struct parsed_partitions *state);
+
+int parse_fit_partitions(struct parsed_partitions *state, u64 start_sector, u64 nr_sectors, int *slot, int add_remain);
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -10,6 +10,10 @@
#include <linux/ctype.h>
#include <linux/vmalloc.h>
#include <linux/raid/detect.h>
+#ifdef CONFIG_FIT_PARTITION
+#include <linux/root_dev.h>
+#endif
+
#include "check.h"
static int (*check_part[])(struct parsed_partitions *) = {
@@ -46,6 +50,9 @@ static int (*check_part[])(struct parsed
#ifdef CONFIG_EFI_PARTITION
efi_partition, /* this must come before msdos */
#endif
+#ifdef CONFIG_FIT_PARTITION
+ fit_partition,
+#endif
#ifdef CONFIG_SGI_PARTITION
sgi_partition,
#endif
@@ -398,6 +405,11 @@ static struct block_device *add_partitio
goto out_del;
}
+#ifdef CONFIG_FIT_PARTITION
+ if (flags & ADDPART_FLAG_READONLY)
+ bdev->bd_read_only = true;
+#endif
+
/* everything is up and running, commence */
err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL);
if (err)
@@ -585,6 +597,11 @@ static bool blk_add_partition(struct gen
(state->parts[p].flags & ADDPART_FLAG_RAID))
md_autodetect_dev(part->bd_dev);
+#ifdef CONFIG_FIT_PARTITION
+ if ((state->parts[p].flags & ADDPART_FLAG_ROOTDEV) && ROOT_DEV == 0)
+ ROOT_DEV = part->bd_dev;
+#endif
+
return true;
}
--- a/block/partitions/efi.c
+++ b/block/partitions/efi.c
@@ -716,6 +716,9 @@ int efi_partition(struct parsed_partitio
gpt_entry *ptes = NULL;
u32 i;
unsigned ssz = queue_logical_block_size(state->disk->queue) / 512;
+#ifdef CONFIG_FIT_PARTITION
+ u32 extra_slot = 64;
+#endif
if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) {
kfree(gpt);
@@ -749,6 +752,11 @@ int efi_partition(struct parsed_partitio
ARRAY_SIZE(ptes[i].partition_name));
utf16_le_to_7bit(ptes[i].partition_name, label_max, info->volname);
state->parts[i + 1].has_info = true;
+#ifdef CONFIG_FIT_PARTITION
+ /* If this is a U-Boot FIT volume it may have subpartitions */
+ if (!efi_guidcmp(ptes[i].partition_type_guid, PARTITION_LINUX_FIT_GUID))
+ (void) parse_fit_partitions(state, start * ssz, size * ssz, &extra_slot, 1);
+#endif
}
kfree(ptes);
kfree(gpt);
--- a/block/partitions/efi.h
+++ b/block/partitions/efi.h
@@ -51,6 +51,9 @@
#define PARTITION_LINUX_LVM_GUID \
EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
+#define PARTITION_LINUX_FIT_GUID \
+ EFI_GUID( 0xcae9be83, 0xb15f, 0x49cc, \
+ 0x86, 0x3f, 0x08, 0x1b, 0x74, 0x4a, 0x2d, 0x93)
typedef struct _gpt_header {
__le64 signature;
--- a/block/partitions/msdos.c
+++ b/block/partitions/msdos.c
@@ -564,6 +564,15 @@ static void parse_minix(struct parsed_pa
#endif /* CONFIG_MINIX_SUBPARTITION */
}
+static void parse_fit_mbr(struct parsed_partitions *state,
+ sector_t offset, sector_t size, int origin)
+{
+#ifdef CONFIG_FIT_PARTITION
+ u32 extra_slot = 64;
+ (void) parse_fit_partitions(state, offset, size, &extra_slot, 1);
+#endif /* CONFIG_FIT_PARTITION */
+}
+
static struct {
unsigned char id;
void (*parse)(struct parsed_partitions *, sector_t, sector_t, int);
@@ -575,6 +584,7 @@ static struct {
{UNIXWARE_PARTITION, parse_unixware},
{SOLARIS_X86_PARTITION, parse_solaris_x86},
{NEW_SOLARIS_X86_PARTITION, parse_solaris_x86},
+ {FIT_PARTITION, parse_fit_mbr},
{0, NULL},
};
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -359,7 +359,9 @@ int add_mtd_blktrans_dev(struct mtd_blkt
} else {
snprintf(gd->disk_name, sizeof(gd->disk_name),
"%s%d", tr->name, new->devnum);
- gd->flags |= GENHD_FL_NO_PART;
+
+ if (!IS_ENABLED(CONFIG_FIT_PARTITION) || mtd_type_is_nand(new->mtd))
+ gd->flags |= GENHD_FL_NO_PART;
}
set_capacity(gd, ((u64)new->size * tr->blksize) >> 9);
--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -431,7 +431,9 @@ int ubiblock_create(struct ubi_volume_in
ret = -ENODEV;
goto out_cleanup_disk;
}
- gd->flags |= GENHD_FL_NO_PART;
+ if (!IS_ENABLED(CONFIG_FIT_PARTITION))
+ gd->flags |= GENHD_FL_NO_PART;
+
gd->private_data = dev;
sprintf(gd->disk_name, "ubiblock%d_%d", dev->ubi_num, dev->vol_id);
set_capacity(gd, disk_capacity);
--- a/include/linux/msdos_partition.h
+++ b/include/linux/msdos_partition.h
@@ -31,6 +31,7 @@ enum msdos_sys_ind {
LINUX_LVM_PARTITION = 0x8e,
LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
+ FIT_PARTITION = 0x2e, /* U-Boot uImage.FIT */
SOLARIS_X86_PARTITION = 0x82, /* also Linux swap partitions */
NEW_SOLARIS_X86_PARTITION = 0xbf,