181 lines
4.9 KiB
Diff
181 lines
4.9 KiB
Diff
--- a/drivers/mtd/Kconfig
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+++ b/drivers/mtd/Kconfig
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@@ -23,6 +23,14 @@ config MTD_TESTS
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WARNING: some of the tests will ERASE entire MTD device which they
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test. Do not use these tests unless you really know what you do.
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+config MTD_ROOTFS_ROOT_DEV
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+ bool "Automatically set 'rootfs' partition to be root filesystem"
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+ default y
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+
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+config MTD_ROOTFS_SPLIT
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+ bool "Automatically split 'rootfs' partition for squashfs"
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+ default y
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+
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config MTD_REDBOOT_PARTS
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tristate "RedBoot partition table parsing"
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---help---
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -29,6 +29,8 @@
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#include <linux/kmod.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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+#include <linux/root_dev.h>
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+#include <linux/magic.h>
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#include <linux/err.h>
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#include "mtdcore.h"
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@@ -50,7 +52,7 @@ struct mtd_part {
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* the pointer to that structure with this macro.
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*/
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#define PART(x) ((struct mtd_part *)(x))
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-
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+#define IS_PART(mtd) (mtd->_read == part_read)
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/*
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* MTD methods which simply translate the effective address and pass through
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@@ -613,6 +615,92 @@ int mtd_del_partition(struct mtd_info *m
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}
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EXPORT_SYMBOL_GPL(mtd_del_partition);
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+#ifdef CONFIG_MTD_ROOTFS_SPLIT
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+#define ROOTFS_SPLIT_NAME "rootfs_data"
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+#define ROOTFS_REMOVED_NAME "<removed>"
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+
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+struct squashfs_super_block {
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+ __le32 s_magic;
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+ __le32 pad0[9];
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+ __le64 bytes_used;
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+};
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+
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+
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+static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
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+{
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+ struct squashfs_super_block sb;
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+ int len, ret;
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+
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+ ret = mtd_read(master, offset, sizeof(sb), &len, (void *) &sb);
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+ if (ret || (len != sizeof(sb))) {
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+ printk(KERN_ALERT "split_squashfs: error occured while reading "
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+ "from \"%s\"\n", master->name);
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+ return -EINVAL;
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+ }
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+
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+ if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) ) {
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+ printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
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+ master->name);
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+ *split_offset = 0;
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+ return 0;
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+ }
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+
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+ if (le64_to_cpu((sb.bytes_used)) <= 0) {
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+ printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
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+ master->name);
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+ *split_offset = 0;
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+ return 0;
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+ }
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+
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+ len = (u32) le64_to_cpu(sb.bytes_used);
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+ len += (offset & 0x000fffff);
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+ len += (master->erasesize - 1);
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+ len &= ~(master->erasesize - 1);
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+ len -= (offset & 0x000fffff);
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+ *split_offset = offset + len;
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+
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+ return 0;
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+}
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+
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+static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part)
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+{
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+ struct mtd_partition dpart;
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+ struct mtd_part *slave = NULL;
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+ struct mtd_part *spart;
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+ int ret, split_offset = 0;
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+
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+ spart = PART(rpart);
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+ ret = split_squashfs(master, spart->offset, &split_offset);
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+ if (ret)
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+ return ret;
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+
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+ if (split_offset <= 0)
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+ return 0;
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+
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+ memcpy(&dpart, part, sizeof(dpart));
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+ dpart.name = ROOTFS_SPLIT_NAME;
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+
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+ dpart.size = rpart->size - (split_offset - spart->offset);
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+ dpart.offset = split_offset;
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+
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+ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n",
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+ ROOTFS_SPLIT_NAME, dpart.offset, dpart.size);
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+
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+ slave = allocate_partition(master, &dpart, 0, split_offset);
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+ if (IS_ERR(slave))
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+ return PTR_ERR(slave);
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+ mutex_lock(&mtd_partitions_mutex);
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+ list_add(&slave->list, &mtd_partitions);
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+ mutex_unlock(&mtd_partitions_mutex);
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+
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+ add_mtd_device(&slave->mtd);
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+
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+ rpart->split = &slave->mtd;
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+
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+ return 0;
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+}
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+#endif /* CONFIG_MTD_ROOTFS_SPLIT */
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+
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/*
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* This function, given a master MTD object and a partition table, creates
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* and registers slave MTD objects which are bound to the master according to
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@@ -629,6 +717,9 @@ int add_mtd_partitions(struct mtd_info *
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struct mtd_part *slave;
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uint64_t cur_offset = 0;
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int i;
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+#ifdef CONFIG_MTD_ROOTFS_SPLIT
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+ int ret;
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+#endif
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printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
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@@ -643,6 +734,21 @@ int add_mtd_partitions(struct mtd_info *
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add_mtd_device(&slave->mtd);
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+ if (!strcmp(parts[i].name, "rootfs")) {
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+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
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+ if (ROOT_DEV == 0) {
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+ printk(KERN_NOTICE "mtd: partition \"rootfs\" "
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+ "set to be root filesystem\n");
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+ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
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+ }
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+#endif
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+#ifdef CONFIG_MTD_ROOTFS_SPLIT
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+ ret = split_rootfs_data(master, &slave->mtd, &parts[i]);
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+ /* if (ret == 0)
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+ * j++; */
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+#endif
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+ }
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+
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cur_offset = slave->offset + slave->mtd.size;
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}
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--- a/include/linux/mtd/mtd.h
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+++ b/include/linux/mtd/mtd.h
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@@ -114,6 +114,7 @@ struct nand_ecclayout {
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struct module; /* only needed for owner field in mtd_info */
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+struct mtd_info;
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struct mtd_info {
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u_char type;
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uint32_t flags;
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@@ -226,6 +227,8 @@ struct mtd_info {
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int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs);
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int (*_suspend) (struct mtd_info *mtd);
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void (*_resume) (struct mtd_info *mtd);
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+ struct mtd_info *split;
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+
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/*
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* If the driver is something smart, like UBI, it may need to maintain
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* its own reference counting. The below functions are only for driver.
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