kernel/3.10: add more helpers to the mtdsplit code
Signed-off-by: Gabor Juhos <juhosg@openwrt.org> SVN-Revision: 38111
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@ -64,3 +64,53 @@ int mtd_get_squashfs_len(struct mtd_info *master,
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return 0;
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}
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EXPORT_SYMBOL_GPL(mtd_get_squashfs_len);
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static ssize_t mtd_next_eb(struct mtd_info *mtd, size_t offset)
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{
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return mtd_rounddown_to_eb(offset, mtd) + mtd->erasesize;
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}
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int mtd_check_rootfs_magic(struct mtd_info *mtd, size_t offset)
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{
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u32 magic;
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size_t retlen;
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int ret;
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ret = mtd_read(mtd, offset, sizeof(magic), &retlen,
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(unsigned char *) &magic);
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if (ret)
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return ret;
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if (retlen != sizeof(magic))
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return -EIO;
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if (le32_to_cpu(magic) != SQUASHFS_MAGIC &&
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magic != 0x19852003)
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return -EINVAL;
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return 0;
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}
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EXPORT_SYMBOL_GPL(mtd_check_rootfs_magic);
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int mtd_find_rootfs_from(struct mtd_info *mtd,
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size_t from,
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size_t limit,
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size_t *ret_offset)
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{
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size_t offset;
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int err;
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for (offset = from; offset < limit;
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offset = mtd_next_eb(mtd, offset)) {
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err = mtd_check_rootfs_magic(mtd, offset);
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if (err)
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continue;
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*ret_offset = offset;
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL_GPL(mtd_find_rootfs_from);
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@ -19,6 +19,14 @@
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int mtd_get_squashfs_len(struct mtd_info *master,
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size_t offset,
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size_t *squashfs_len);
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int mtd_check_rootfs_magic(struct mtd_info *mtd, size_t offset);
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int mtd_find_rootfs_from(struct mtd_info *mtd,
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size_t from,
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size_t limit,
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size_t *ret_offset);
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#else
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static inline int mtd_get_squashfs_len(struct mtd_info *master,
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size_t offset,
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@ -26,6 +34,19 @@ static inline int mtd_get_squashfs_len(struct mtd_info *master,
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{
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return -ENODEV;
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}
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#endif
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static inline int mtd_check_rootfs_magic(struct mtd_info *mtd, size_t offset)
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{
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return -EINVAL;
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}
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static inline int mtd_find_rootfs_from(struct mtd_info *mtd,
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size_t from,
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size_t limit,
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size_t *ret_offset)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_MTD_SPLIT */
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#endif /* _MTDSPLIT_H */
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