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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -434,14 +434,12 @@ static struct mtd_part *allocate_partiti
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if (slave->offset == MTDPART_OFS_APPEND)
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slave->offset = cur_offset;
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if (slave->offset == MTDPART_OFS_NXTBLK) {
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- slave->offset = cur_offset;
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- if (mtd_mod_by_eb(cur_offset, master) != 0) {
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- /* Round up to next erasesize */
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- slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
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+ /* Round up to next erasesize */
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+ slave->offset = mtd_roundup_to_eb(cur_offset, master);
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+ if (slave->offset != cur_offset)
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printk(KERN_NOTICE "Moving partition %d: "
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"0x%012llx -> 0x%012llx\n", partno,
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(unsigned long long)cur_offset, (unsigned long long)slave->offset);
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- }
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}
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if (slave->offset == MTDPART_OFS_RETAIN) {
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slave->offset = cur_offset;
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@@ -944,6 +942,24 @@ int mtd_is_partition(const struct mtd_in
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}
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EXPORT_SYMBOL_GPL(mtd_is_partition);
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+struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd)
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+{
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+ if (!mtd_is_partition(mtd))
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+ return (struct mtd_info *)mtd;
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+
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+ return PART(mtd)->master;
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+}
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+EXPORT_SYMBOL_GPL(mtdpart_get_master);
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+
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+uint64_t mtdpart_get_offset(const struct mtd_info *mtd)
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+{
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+ if (!mtd_is_partition(mtd))
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+ return 0;
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+
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+ return PART(mtd)->offset;
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+}
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+EXPORT_SYMBOL_GPL(mtdpart_get_offset);
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+
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/* Returns the size of the entire flash chip */
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uint64_t mtd_get_device_size(const struct mtd_info *mtd)
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{
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--- a/include/linux/mtd/partitions.h
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+++ b/include/linux/mtd/partitions.h
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@@ -90,6 +90,8 @@ int mtd_is_partition(const struct mtd_in
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int mtd_add_partition(struct mtd_info *master, const char *name,
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long long offset, long long length);
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int mtd_del_partition(struct mtd_info *master, int partno);
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+struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd);
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+uint64_t mtdpart_get_offset(const struct mtd_info *mtd);
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uint64_t mtd_get_device_size(const struct mtd_info *mtd);
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extern void __weak arch_split_mtd_part(struct mtd_info *master,
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const char *name, int offset, int size);
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--- a/include/linux/mtd/mtd.h
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+++ b/include/linux/mtd/mtd.h
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@@ -331,6 +331,24 @@ static inline uint32_t mtd_mod_by_eb(uin
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return do_div(sz, mtd->erasesize);
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}
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+static inline uint64_t mtd_roundup_to_eb(uint64_t sz, struct mtd_info *mtd)
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+{
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+ if (mtd_mod_by_eb(sz, mtd) == 0)
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+ return sz;
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+
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+ /* Round up to next erase block */
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+ return (mtd_div_by_eb(sz, mtd) + 1) * mtd->erasesize;
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+}
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+
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+static inline uint64_t mtd_rounddown_to_eb(uint64_t sz, struct mtd_info *mtd)
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+{
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+ if (mtd_mod_by_eb(sz, mtd) == 0)
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+ return sz;
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+
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+ /* Round down to the start of the current erase block */
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+ return (mtd_div_by_eb(sz, mtd)) * mtd->erasesize;
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+}
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+
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static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
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{
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if (mtd->writesize_shift)
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