OpenWrt – Rev 2
?pathlinks?
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -52,6 +52,14 @@ 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_ROOT_DEV
+ bool "Automatically set 'rootfs' partition to be root filesystem"
+ default y
+
+config MTD_ROOTFS_SPLIT
+ bool "Automatically split 'rootfs' partition for squashfs"
+ default y
+
config MTD_REDBOOT_PARTS
tristate "RedBoot partition table parsing"
---help---
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -30,6 +30,8 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/of.h>
+#include <linux/root_dev.h>
+#include <linux/magic.h>
#include <linux/err.h>
#include "mtdcore.h"
@@ -53,7 +55,7 @@ struct mtd_part {
* the pointer to that structure with this macro.
*/
#define PART(x) ((struct mtd_part *)(x))
-
+#define IS_PART(mtd) (mtd->_read == part_read)
/*
* MTD methods which simply translate the effective address and pass through
@@ -706,6 +708,144 @@ int mtd_del_partition(struct mtd_info *m
}
EXPORT_SYMBOL_GPL(mtd_del_partition);
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
+#define ROOTFS_SPLIT_NAME "rootfs_data"
+#define ROOTFS_REMOVED_NAME "<removed>"
+
+struct squashfs_super_block {
+ __le32 s_magic;
+ __le32 pad0[9];
+ __le64 bytes_used;
+};
+
+
+static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
+{
+ struct squashfs_super_block sb;
+ int len, ret;
+
+ ret = mtd_read(master, offset, sizeof(sb), &len, (void *) &sb);
+ if (ret || (len != sizeof(sb))) {
+ printk(KERN_ALERT "split_squashfs: error occured while reading "
+ "from \"%s\"\n", master->name);
+ return -EINVAL;
+ }
+
+ if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) ) {
+ printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
+ master->name);
+ *split_offset = 0;
+ return 0;
+ }
+
+ if (le64_to_cpu((sb.bytes_used)) <= 0) {
+ printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
+ master->name);
+ *split_offset = 0;
+ return 0;
+ }
+
+ len = (u32) le64_to_cpu(sb.bytes_used);
+ len += (offset & 0x000fffff);
+ len += (master->erasesize - 1);
+ len &= ~(master->erasesize - 1);
+ len -= (offset & 0x000fffff);
+ *split_offset = offset + len;
+
+ return 0;
+}
+
+static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part)
+{
+ struct mtd_partition dpart;
+ struct mtd_part *slave = NULL;
+ struct mtd_part *spart;
+ int ret, split_offset = 0;
+
+ spart = PART(rpart);
+ ret = split_squashfs(master, spart->offset, &split_offset);
+ if (ret)
+ return ret;
+
+ if (split_offset <= 0)
+ return 0;
+
+ memcpy(&dpart, part, sizeof(dpart));
+ dpart.name = ROOTFS_SPLIT_NAME;
+
+ 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;
+}
+
+static int refresh_rootfs_split(struct mtd_info *mtd)
+{
+ struct mtd_partition tpart;
+ struct mtd_part *part;
+ char *name;
+ //int index = 0;
+ int offset, size;
+ int ret;
+
+ part = PART(mtd);
+
+ /* check for the new squashfs offset first */
+ ret = split_squashfs(part->master, part->offset, &offset);
+ if (ret)
+ return ret;
+
+ if ((offset > 0) && !mtd->split) {
+ printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
+ /* if we don't have a rootfs split partition, create a new one */
+ tpart.name = (char *) mtd->name;
+ tpart.size = mtd->size;
+ tpart.offset = part->offset;
+
+ return split_rootfs_data(part->master, &part->mtd, &tpart);
+ } else if ((offset > 0) && mtd->split) {
+ /* update the offsets of the existing partition */
+ size = mtd->size + part->offset - offset;
+
+ part = PART(mtd->split);
+ part->offset = offset;
+ part->mtd.size = size;
+ printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
+ __func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
+ (u32) part->offset, (u32) part->mtd.size);
+ name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
+ strcpy(name, ROOTFS_SPLIT_NAME);
+ part->mtd.name = name;
+ } else if ((offset <= 0) && mtd->split) {
+ printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
+
+ /* mark existing partition as removed */
+ part = PART(mtd->split);
+ name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
+ strcpy(name, ROOTFS_REMOVED_NAME);
+ part->mtd.name = name;
+ part->offset = 0;
+ part->mtd.size = 0;
+ }
+
+ return 0;
+}
+#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
@@ -722,6 +862,9 @@ 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);
@@ -736,12 +879,53 @@ int add_mtd_partitions(struct mtd_info *
add_mtd_device(&slave->mtd);
+ 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;
}
return 0;
}
+int mtd_device_refresh(struct mtd_info *mtd)
+{
+ int ret = 0;
+
+ if (IS_PART(mtd)) {
+ struct mtd_part *part;
+ struct mtd_info *master;
+
+ part = PART(mtd);
+ master = part->master;
+ if (master->refresh_device)
+ ret = master->refresh_device(master);
+ }
+
+ if (!ret && mtd->refresh_device)
+ ret = mtd->refresh_device(mtd);
+
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
+ if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
+ refresh_rootfs_split(mtd);
+#endif
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mtd_device_refresh);
+
static DEFINE_SPINLOCK(part_parser_lock);
static LIST_HEAD(part_parsers);
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -1012,6 +1012,12 @@ static int mtdchar_ioctl(struct file *fi
break;
}
+ case MTDREFRESH:
+ {
+ ret = mtd_device_refresh(mtd);
+ break;
+ }
+
default:
ret = -ENOTTY;
}
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -115,6 +115,7 @@ 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;
@@ -231,6 +232,9 @@ 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);
+ int (*refresh_device)(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.
@@ -397,6 +401,7 @@ extern int mtd_device_parse_register(str
int defnr_parts);
#define mtd_device_register(master, parts, nr_parts) \
mtd_device_parse_register(master, NULL, NULL, parts, nr_parts)
+extern int mtd_device_refresh(struct mtd_info *master);
extern int mtd_device_unregister(struct mtd_info *master);
extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
extern int __get_mtd_device(struct mtd_info *mtd);
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -37,12 +37,14 @@
*/
struct mtd_info;
+struct mtd_partition;
struct mtd_partition {
const char *name; /* identifier string */
uint64_t size; /* partition size */
uint64_t offset; /* offset within the master MTD space */
uint32_t mask_flags; /* master MTD flags to mask out for this partition */
struct nand_ecclayout *ecclayout; /* out of band layout for this partition (NAND only) */
+ int (*refresh_partition)(struct mtd_info *);
};
#define MTDPART_OFS_RETAIN (-3)
--- a/include/uapi/mtd/mtd-abi.h
+++ b/include/uapi/mtd/mtd-abi.h
@@ -203,6 +203,7 @@ struct otp_info {
* without OOB, e.g., NOR flash.
*/
#define MEMWRITE _IOWR('M', 24, struct mtd_write_req)
+#define MTDREFRESH _IO('M', 50)
/*
* Obsolete legacy interface. Keep it in order not to break userspace