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-rw-r--r--target/linux/generic-2.6/patches/060-rootfs_split.patch200
1 files changed, 139 insertions, 61 deletions
diff --git a/target/linux/generic-2.6/patches/060-rootfs_split.patch b/target/linux/generic-2.6/patches/060-rootfs_split.patch
index 7e4161e8df..c8fe052b83 100644
--- a/target/linux/generic-2.6/patches/060-rootfs_split.patch
+++ b/target/linux/generic-2.6/patches/060-rootfs_split.patch
@@ -1,21 +1,28 @@
-diff -urN linux-2.6.21.1.old/drivers/mtd/Kconfig linux-2.6.21.1.dev/drivers/mtd/Kconfig
---- linux-2.6.21.1.old/drivers/mtd/Kconfig 2007-04-27 23:49:26.000000000 +0200
-+++ linux-2.6.21.1.dev/drivers/mtd/Kconfig 2007-05-26 19:58:42.320520952 +0200
-@@ -49,6 +49,11 @@
+Index: linux/drivers/mtd/Kconfig
+===================================================================
+--- linux.orig/drivers/mtd/Kconfig
++++ linux/drivers/mtd/Kconfig
+@@ -47,6 +47,16 @@ config MTD_PARTITIONS
devices. Partitioning on NFTL 'devices' is a different - that's the
'normal' form of partitioning used on a block device.
-+config MTD_SPLIT_ROOTFS
-+ bool "Automatically split rootfs partition for squashfs"
++config MTD_ROOTFS_ROOT_DEV
++ bool "Automatically set 'rootfs' partition to be root filesystem"
++ depends on MTD_PARTITIONS
++ default y
++
++config MTD_ROOTFS_SPLIT
++ bool "Automatically split 'rootfs' partition for squashfs"
+ depends on MTD_PARTITIONS
+ default y
+
config MTD_REDBOOT_PARTS
tristate "RedBoot partition table parsing"
depends on MTD_PARTITIONS
-diff -urN linux-2.6.21.1.old/drivers/mtd/mtdpart.c linux-2.6.21.1.dev/drivers/mtd/mtdpart.c
---- linux-2.6.21.1.old/drivers/mtd/mtdpart.c 2007-04-27 23:49:26.000000000 +0200
-+++ linux-2.6.21.1.dev/drivers/mtd/mtdpart.c 2007-05-26 19:58:42.331519280 +0200
+Index: linux/drivers/mtd/mtdpart.c
+===================================================================
+--- linux.orig/drivers/mtd/mtdpart.c
++++ linux/drivers/mtd/mtdpart.c
@@ -20,6 +20,8 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
@@ -25,15 +32,16 @@ diff -urN linux-2.6.21.1.old/drivers/mtd/mtdpart.c linux-2.6.21.1.dev/drivers/mt
/* Our partition linked list */
static LIST_HEAD(mtd_partitions);
-@@ -308,6 +310,172 @@
+@@ -308,6 +310,265 @@ int del_mtd_partitions(struct mtd_info *
return 0;
}
+static u_int32_t cur_offset = 0;
-+static int add_mtd_partition(struct mtd_info *master, const struct mtd_partition *part, int i)
++static int add_one_partition(struct mtd_info *master, const struct mtd_partition *part,
++ int i, struct mtd_part **slp)
+{
+ struct mtd_part *slave;
-+
++
+ /* allocate the partition structure */
+ slave = kzalloc (sizeof(*slave), GFP_KERNEL);
+ if (!slave) {
@@ -54,7 +62,6 @@ diff -urN linux-2.6.21.1.old/drivers/mtd/mtdpart.c linux-2.6.21.1.dev/drivers/mt
+ slave->mtd.subpage_sft = master->subpage_sft;
+
+ slave->mtd.name = part->name;
-+ slave->mtd.bank_size = master->bank_size;
+ slave->mtd.owner = master->owner;
+
+ slave->mtd.read = part_read;
@@ -192,62 +199,118 @@ diff -urN linux-2.6.21.1.old/drivers/mtd/mtdpart.c linux-2.6.21.1.dev/drivers/mt
+ slave->registered = 1;
+ }
+
++ if (slp)
++ *slp = slave;
++
+ return 0;
+}
+
++#ifdef CONFIG_MTD_ROOTFS_SPLIT
++#define ROOTFS_SPLIT_NAME "rootfs_data"
++static int split_squashfs(struct mtd_info *master, struct mtd_partition *old,
++ struct mtd_partition **new)
++{
++ struct mtd_partition *part = NULL;
++ int len;
++ char buf[512];
++ struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
++ int ret;
++
++ ret = master->read(master, old->offset, sizeof(*sb), &len, buf);
++ if (ret) {
++ printk(KERN_ALERT "split_squashfs: error occured while reading "
++ "from \"%s\"\n", master->name);
++ goto out;
++ }
++
++ if (len != sizeof(*sb)) {
++ printk(KERN_ALERT "split_squashfs: unable to read superblock "
++ "from \"%s\"\n", master->name);
++ ret=-1;
++ goto out;
++ }
++
++ if (*((u32 *) buf) != SQUASHFS_MAGIC) {
++ printk(KERN_ALERT "split_squasfs: no squashfs found in \"%s\"\n",
++ master->name);
++ ret=0;
++ goto out;
++ }
++
++ if (sb->bytes_used <= 0) {
++ printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
++ master->name);
++ ret=0;
++ goto out;
++ }
++
++ part = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
++ if (part == NULL) {
++ printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
++ ROOTFS_SPLIT_NAME);
++ ret = -ENOMEM;
++ goto out;
++ }
++
++ part->name = (unsigned char *)&part[1];
++ memcpy(part, old, sizeof(*part));
++ strcpy(part->name, ROOTFS_SPLIT_NAME);
++
++ len = (u32) sb->bytes_used;
++ len += (part->offset & 0x000fffff);
++ len += (master->erasesize - 1);
++ len &= ~(master->erasesize - 1);
++ len -= (part->offset & 0x000fffff);
++ part->offset += len;
++ part->size -= len;
++
++ ret = 0;
++
++out:
++ *new = part;
++ return ret;
++}
++
++static int split_rootfs_data(struct mtd_info *master, struct mtd_partition *part,
++ int index)
++{
++ struct mtd_partition *dpart;
++ int ret;
++
++ ret = split_squashfs(master, part, &dpart);
++ if (ret)
++ return ret;
++
++ if (dpart == NULL)
++ return 1;
++
++ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%lX, len=%lX \n",
++ ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
++
++ ret = add_one_partition(master, dpart, index, NULL);
++ if (ret)
++ kfree(dpart);
++
++ return ret;
++}
++#endif /* CONFIG_MTD_ROOTFS_SPLIT */
++
/*
* 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
-@@ -319,170 +487,53 @@
- const struct mtd_partition *parts,
+@@ -320,168 +581,31 @@ int add_mtd_partitions(struct mtd_info *
int nbparts)
{
-- struct mtd_part *slave;
+ struct mtd_part *slave;
- u_int32_t cur_offset = 0;
- int i;
+ struct mtd_partition *part;
-+ int i, ret = 0;
++ int i, j, ret = 0;
printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
- for (i = 0; i < nbparts; i++) {
-+ part = (struct mtd_partition *) &parts[i];
-+ ret = add_mtd_partition(master, part, i);
-+ if (ret)
-+ return ret;
-+ if (strcmp(part->name, "rootfs") == 0) {
-+#ifdef CONFIG_MTD_SPLIT_ROOTFS
-+ int len;
-+ char buf[512];
-+ struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
-+#define ROOTFS_SPLIT_NAME "rootfs_data"
-+ if ((master->read(master, part->offset, sizeof(struct squashfs_super_block), &len, buf) == 0) &&
-+ (len == sizeof(struct squashfs_super_block)) &&
-+ (*((u32 *) buf) == SQUASHFS_MAGIC) &&
-+ (sb->bytes_used > 0)) {
-+
-+
-+ part = kmalloc(sizeof(struct mtd_partition), GFP_KERNEL);
-+ memcpy(part, &parts[i], sizeof(struct mtd_partition));
-+
-+ part->name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
-+ strcpy(part->name, ROOTFS_SPLIT_NAME);
-+
-+ len = (u32) sb->bytes_used;
-+ len += (part->offset & 0x000fffff);
-+ len += (master->erasesize - 1);
-+ len &= ~(master->erasesize - 1);
-+ len -= (part->offset & 0x000fffff);
-+ part->offset += len;
-+ part->size -= len;
-+
-+ if (master->erasesize <= part->size)
-+ ret = add_mtd_partition(master, part, i + 1);
-+ else
-+ kfree(part->name);
-+ if (ret)
-+ return ret;
-
+- for (i = 0; i < nbparts; i++) {
+-
- /* allocate the partition structure */
- slave = kzalloc (sizeof(*slave), GFP_KERNEL);
- if (!slave) {
@@ -268,7 +331,6 @@ diff -urN linux-2.6.21.1.old/drivers/mtd/mtdpart.c linux-2.6.21.1.dev/drivers/mt
- slave->mtd.subpage_sft = master->subpage_sft;
-
- slave->mtd.name = parts[i].name;
-- slave->mtd.bank_size = master->bank_size;
- slave->mtd.owner = master->owner;
-
- slave->mtd.read = part_read;
@@ -326,8 +388,7 @@ diff -urN linux-2.6.21.1.old/drivers/mtd/mtdpart.c linux-2.6.21.1.dev/drivers/mt
- printk(KERN_NOTICE "Moving partition %d: "
- "0x%08x -> 0x%08x\n", i,
- cur_offset, slave->offset);
-+ kfree(part);
- }
+- }
- }
- if (slave->mtd.size == MTDPART_SIZ_FULL)
- slave->mtd.size = master->size - slave->offset;
@@ -392,7 +453,20 @@ diff -urN linux-2.6.21.1.old/drivers/mtd/mtdpart.c linux-2.6.21.1.dev/drivers/mt
- offs + slave->offset))
- slave->mtd.ecc_stats.badblocks++;
- offs += slave->mtd.erasesize;
-- }
++ for (i = 0, j = 0; i < nbparts; i++) {
++ part = (struct mtd_partition *) &parts[i];
++ ret = add_one_partition(master, part, j, &slave);
++ if (ret)
++ return ret;
++ j++;
++
++ if (strcmp(part->name, "rootfs") == 0 && slave->registered) {
++#if 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);
+ }
- }
-
- if(parts[i].mtdp)
@@ -405,8 +479,12 @@ diff -urN linux-2.6.21.1.old/drivers/mtd/mtdpart.c linux-2.6.21.1.dev/drivers/mt
- /* register our partition */
- add_mtd_device(&slave->mtd);
- slave->registered = 1;
-+#endif /* CONFIG_MTD_SPLIT_ROOTFS */
-+ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, i);
++#endif
++#if CONFIG_MTD_ROOTFS_SPLIT
++ ret = split_rootfs_data(master, part, j);
++ if (ret == 0)
++ j++;
++#endif
}
}
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