--- 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.
+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"
#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))
/*
* 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>"
+ }
+
+ 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;
++
++ 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);
++
++ __mtd_add_partition(master, ROOTFS_SPLIT_NAME, split_offset,
++ split_size, false);
++}
++#endif /* CONFIG_MTD_ROOTFS_SPLIT */
+
-+ memcpy(&dpart, part, sizeof(dpart));
-+ dpart.name = ROOTFS_SPLIT_NAME;
++#ifdef CONFIG_MTD_UIMAGE_SPLIT
++#define UBOOT_MAGIC 0x27051956
+
-+ dpart.size = rpart->size - (split_offset - spart->offset);
-+ dpart.offset = split_offset;
++static void split_uimage(struct mtd_info *master, struct mtd_part *part)
++{
++ struct {
++ __be32 magic;
++ __be32 pad[2];
++ __be32 size;
++ } hdr;
++ size_t len;
+
-+ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n",
-+ ROOTFS_SPLIT_NAME, dpart.offset, dpart.size);
++ if (strcmp(part->mtd.name, CONFIG_MTD_UIMAGE_SPLIT_NAME) != 0)
++ return;
+
-+ 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);
++ if (mtd_read(master, part->offset, sizeof(hdr), &len, (void *) &hdr))
++ return;
+
-+ add_mtd_device(&slave->mtd);
++ if (len != sizeof(hdr) || hdr.magic != cpu_to_be32(UBOOT_MAGIC))
++ return;
+
-+ rpart->split = &slave->mtd;
++ len = be32_to_cpu(hdr.size) + 0x40;
++ len = mtd_pad_erasesize(master, part->offset, len);
++ if (len + master->erasesize > part->mtd.size)
++ return;
+
-+ return 0;
++ __mtd_add_partition(master, "rootfs", part->offset + len,
++ part->mtd.size - len, false);
+}
-+#endif /* CONFIG_MTD_ROOTFS_SPLIT */
++#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
projects / openwrt / openwrt.git / commitdiff