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kernel: implement automatic rootfs split from the firmware partition in linux 3.10 (disabled by default)

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 37283
This commit is contained in:
Felix Fietkau 2013-07-14 12:57:03 +00:00
parent b95bdc8ab5
commit 656d475043
2 changed files with 184 additions and 81 deletions
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2
target/linux/generic/config-3.10
View File

@ -1840,6 +1840,8 @@ CONFIG_MTD_ROOTFS_SPLIT=y
# CONFIG_MTD_SWAP is not set
# CONFIG_MTD_TESTS is not set
# CONFIG_MTD_UBI is not set
# CONFIG_MTD_UIMAGE_SPLIT is not set
CONFIG_MTD_UIMAGE_SPLIT_NAME="firmware"
# CONFIG_MUTEX_SPIN_ON_OWNER is not set
# CONFIG_MV643XX_ETH is not set
# CONFIG_MVMDIO is not set

263
target/linux/generic/patches-3.10/400-rootfs_split.patch
View File

@ -1,6 +1,6 @@
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -23,6 +23,14 @@ config MTD_TESTS
@@ -23,6 +23,23 @@ config MTD_TESTS
WARNING: some of the tests will ERASE entire MTD device which they
test. Do not use these tests unless you really know what you do.
@ -11,6 +11,15 @@
+config MTD_ROOTFS_SPLIT
+ bool "Automatically split 'rootfs' partition for squashfs"
+ default y
+
+config MTD_UIMAGE_SPLIT
+ bool "Automatically split off rootfs from a kernel partition containing a uImage"
+ default y
+
+config MTD_UIMAGE_SPLIT_NAME
+ string "uImage partition name"
+ depends on MTD_UIMAGE_SPLIT
+ default "firmware"
+
config MTD_REDBOOT_PARTS
tristate "RedBoot partition table parsing"
@ -26,7 +35,14 @@
#include <linux/err.h>
#include "mtdcore.h"
@@ -50,7 +52,7 @@ struct mtd_part {
@@ -45,12 +47,14 @@ struct mtd_part {
struct list_head list;
};
+static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part);
+
/*
* Given a pointer to the MTD object in the mtd_part structure, we can retrieve
* the pointer to that structure with this macro.
*/
#define PART(x) ((struct mtd_part *)(x))
@ -35,10 +51,82 @@
/*
* MTD methods which simply translate the effective address and pass through
@@ -613,6 +615,92 @@ int mtd_del_partition(struct mtd_info *m
@@ -533,8 +537,10 @@ out_register:
return slave;
}
-int mtd_add_partition(struct mtd_info *master, char *name,
- long long offset, long long length)
+
+static int
+__mtd_add_partition(struct mtd_info *master, char *name,
+ long long offset, long long length, bool dup_check)
{
struct mtd_partition part;
struct mtd_part *p, *new;
@@ -566,21 +572,24 @@ int mtd_add_partition(struct mtd_info *m
end = offset + length;
mutex_lock(&mtd_partitions_mutex);
- list_for_each_entry(p, &mtd_partitions, list)
- if (p->master == master) {
- if ((start >= p->offset) &&
- (start < (p->offset + p->mtd.size)))
- goto err_inv;
-
- if ((end >= p->offset) &&
- (end < (p->offset + p->mtd.size)))
- goto err_inv;
- }
+ if (dup_check) {
+ list_for_each_entry(p, &mtd_partitions, list)
+ if (p->master == master) {
+ if ((start >= p->offset) &&
+ (start < (p->offset + p->mtd.size)))
+ goto err_inv;
+
+ if ((end >= p->offset) &&
+ (end < (p->offset + p->mtd.size)))
+ goto err_inv;
+ }
+ }
list_add(&new->list, &mtd_partitions);
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&new->mtd);
+ mtd_partition_split(master, new);
return ret;
err_inv:
@@ -590,6 +599,12 @@ err_inv:
}
EXPORT_SYMBOL_GPL(mtd_add_partition);
+int mtd_add_partition(struct mtd_info *master, char *name,
+ long long offset, long long length)
+{
+ return __mtd_add_partition(master, name, offset, length, true);
+}
+
int mtd_del_partition(struct mtd_info *master, int partno)
{
struct mtd_part *slave, *next;
@@ -613,6 +628,149 @@ int mtd_del_partition(struct mtd_info *m
}
EXPORT_SYMBOL_GPL(mtd_del_partition);
+static inline unsigned long
+mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len)
+{
+ unsigned long mask = mtd->erasesize - 1;
+
+ len += offset & mask;
+ len = (len + mask) & ~mask;
+ len -= offset & mask;
+ return len;
+}
+
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
+#define ROOTFS_SPLIT_NAME "rootfs_data"
+#define ROOTFS_REMOVED_NAME "<removed>"
@ -77,105 +165,118 @@
+ }
+
+ len = (u32) le64_to_cpu(sb.bytes_used);
+ len += (offset & 0x000fffff);
+ len += (master->erasesize - 1);
+ len &= ~(master->erasesize - 1);
+ len -= (offset & 0x000fffff);
+ len = mtd_pad_erasesize(master, offset, len);
+ *split_offset = offset + len;
+
+ return 0;
+}
+
+static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part)
+static void split_rootfs_data(struct mtd_info *master, struct mtd_part *part)
+{
+ struct mtd_partition dpart;
+ struct mtd_part *slave = NULL;
+ struct mtd_part *spart;
+ int ret, split_offset = 0;
+ unsigned int split_offset = 0;
+ unsigned int split_size;
+ int ret;
+
+ spart = PART(rpart);
+ ret = split_squashfs(master, spart->offset, &split_offset);
+ ret = split_squashfs(master, part->offset, &split_offset);
+ if (ret)
+ return ret;
+ return;
+
+ if (split_offset <= 0)
+ return 0;
+ return;
+
+ memcpy(&dpart, part, sizeof(dpart));
+ dpart.name = ROOTFS_SPLIT_NAME;
+ split_size = part->mtd.size - (split_offset - part->offset);
+ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=0x%x, len=0x%x\n",
+ ROOTFS_SPLIT_NAME, split_offset, split_size);
+
+ dpart.size = rpart->size - (split_offset - spart->offset);
+ dpart.offset = split_offset;
+
+ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n",
+ ROOTFS_SPLIT_NAME, dpart.offset, dpart.size);
+
+ slave = allocate_partition(master, &dpart, 0, split_offset);
+ if (IS_ERR(slave))
+ return PTR_ERR(slave);
+ mutex_lock(&mtd_partitions_mutex);
+ list_add(&slave->list, &mtd_partitions);
+ mutex_unlock(&mtd_partitions_mutex);
+
+ add_mtd_device(&slave->mtd);
+
+ rpart->split = &slave->mtd;
+
+ return 0;
+ __mtd_add_partition(master, ROOTFS_SPLIT_NAME, split_offset,
+ split_size, false);
+}
+#endif /* CONFIG_MTD_ROOTFS_SPLIT */
+
+#ifdef CONFIG_MTD_UIMAGE_SPLIT
+#define UBOOT_MAGIC 0x27051956
+
+static void split_uimage(struct mtd_info *master, struct mtd_part *part)
+{
+ struct {
+ __be32 magic;
+ __be32 pad[2];
+ __be32 size;
+ } hdr;
+ size_t len;
+
+ if (strcmp(part->mtd.name, CONFIG_MTD_UIMAGE_SPLIT_NAME) != 0)
+ return;
+
+ if (mtd_read(master, part->offset, sizeof(hdr), &len, (void *) &hdr))
+ return;
+
+ if (len != sizeof(hdr) || hdr.magic != cpu_to_be32(UBOOT_MAGIC))
+ return;
+
+ len = be32_to_cpu(hdr.size) + 0x40;
+ len = mtd_pad_erasesize(master, part->offset, len);
+ if (len + master->erasesize > part->mtd.size)
+ return;
+
+ __mtd_add_partition(master, "rootfs", part->offset + len,
+ part->mtd.size - len, false);
+}
+#endif
+
+void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,
+ int offset, int size)
+{
+}
+
+
+static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part)
+{
+ static int rootfs_found = 0;
+
+ if (rootfs_found)
+ return;
+
+ if (!strcmp(part->mtd.name, "rootfs")) {
+ rootfs_found = 1;
+
+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
+ if (ROOT_DEV == 0) {
+ printk(KERN_NOTICE "mtd: partition \"rootfs\" "
+ "set to be root filesystem\n");
+ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, part->mtd.index);
+ }
+#endif
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
+ split_rootfs_data(master, part);
+#endif
+ }
+
+#ifdef CONFIG_MTD_UIMAGE_SPLIT
+ split_uimage(master, part);
+#endif
+
+ arch_split_mtd_part(master, part->mtd.name, part->offset,
+ part->mtd.size);
+}
/*
* This function, given a master MTD object and a partition table, creates
* and registers slave MTD objects which are bound to the master according to
@@ -629,6 +717,9 @@ int add_mtd_partitions(struct mtd_info *
struct mtd_part *slave;
uint64_t cur_offset = 0;
int i;
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
+ int ret;
+#endif
printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
@@ -643,6 +734,21 @@ int add_mtd_partitions(struct mtd_info *
@@ -642,6 +800,7 @@ int add_mtd_partitions(struct mtd_info *
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&slave->mtd);
+ mtd_partition_split(master, slave);
+ if (!strcmp(parts[i].name, "rootfs")) {
+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
+ if (ROOT_DEV == 0) {
+ printk(KERN_NOTICE "mtd: partition \"rootfs\" "
+ "set to be root filesystem\n");
+ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
+ }
+#endif
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
+ ret = split_rootfs_data(master, &slave->mtd, &parts[i]);
+ /* if (ret == 0)
+ * j++; */
+#endif
+ }
+
cur_offset = slave->offset + slave->mtd.size;
}
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -84,5 +84,7 @@ int mtd_add_partition(struct mtd_info *m
long long offset, long long length);
int mtd_del_partition(struct mtd_info *master, int partno);
uint64_t mtd_get_device_size(const struct mtd_info *mtd);
+extern void __weak arch_split_mtd_part(struct mtd_info *master,
+ const char *name, int offset, int size);
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -114,6 +114,7 @@ struct nand_ecclayout {
struct module; /* only needed for owner field in mtd_info */
+struct mtd_info;
struct mtd_info {
u_char type;
uint32_t flags;
@@ -226,6 +227,8 @@ struct mtd_info {
int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
int (*_suspend) (struct mtd_info *mtd);
void (*_resume) (struct mtd_info *mtd);
+ struct mtd_info *split;
+
/*
* If the driver is something smart, like UBI, it may need to maintain
* its own reference counting. The below functions are only for driver.
#endif