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-rw-r--r--target/linux/generic/files/drivers/mtd/mtdsplit.c50
-rw-r--r--target/linux/generic/files/drivers/mtd/mtdsplit.h23
2 files changed, 72 insertions, 1 deletions
diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit.c b/target/linux/generic/files/drivers/mtd/mtdsplit.c
index 0ba35fe950..162739f472 100644
--- a/target/linux/generic/files/drivers/mtd/mtdsplit.c
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit.c
@@ -64,3 +64,53 @@ int mtd_get_squashfs_len(struct mtd_info *master,
return 0;
}
EXPORT_SYMBOL_GPL(mtd_get_squashfs_len);
+
+static ssize_t mtd_next_eb(struct mtd_info *mtd, size_t offset)
+{
+ return mtd_rounddown_to_eb(offset, mtd) + mtd->erasesize;
+}
+
+int mtd_check_rootfs_magic(struct mtd_info *mtd, size_t offset)
+{
+ u32 magic;
+ size_t retlen;
+ int ret;
+
+ ret = mtd_read(mtd, offset, sizeof(magic), &retlen,
+ (unsigned char *) &magic);
+ if (ret)
+ return ret;
+
+ if (retlen != sizeof(magic))
+ return -EIO;
+
+ if (le32_to_cpu(magic) != SQUASHFS_MAGIC &&
+ magic != 0x19852003)
+ return -EINVAL;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mtd_check_rootfs_magic);
+
+int mtd_find_rootfs_from(struct mtd_info *mtd,
+ size_t from,
+ size_t limit,
+ size_t *ret_offset)
+{
+ size_t offset;
+ int err;
+
+ for (offset = from; offset < limit;
+ offset = mtd_next_eb(mtd, offset)) {
+ err = mtd_check_rootfs_magic(mtd, offset);
+ if (err)
+ continue;
+
+ *ret_offset = offset;
+ return 0;
+ }
+
+ return -ENODEV;
+}
+EXPORT_SYMBOL_GPL(mtd_find_rootfs_from);
+
diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit.h b/target/linux/generic/files/drivers/mtd/mtdsplit.h
index 8ba6c8b200..48cb44c090 100644
--- a/target/linux/generic/files/drivers/mtd/mtdsplit.h
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit.h
@@ -19,6 +19,14 @@
int mtd_get_squashfs_len(struct mtd_info *master,
size_t offset,
size_t *squashfs_len);
+
+int mtd_check_rootfs_magic(struct mtd_info *mtd, size_t offset);
+
+int mtd_find_rootfs_from(struct mtd_info *mtd,
+ size_t from,
+ size_t limit,
+ size_t *ret_offset);
+
#else
static inline int mtd_get_squashfs_len(struct mtd_info *master,
size_t offset,
@@ -26,6 +34,19 @@ static inline int mtd_get_squashfs_len(struct mtd_info *master,
{
return -ENODEV;
}
-#endif
+
+static inline int mtd_check_rootfs_magic(struct mtd_info *mtd, size_t offset)
+{
+ return -EINVAL;
+}
+
+static inline int mtd_find_rootfs_from(struct mtd_info *mtd,
+ size_t from,
+ size_t limit,
+ size_t *ret_offset)
+{
+ return -ENODEV;
+}
+#endif /* CONFIG_MTD_SPLIT */
#endif /* _MTDSPLIT_H */