Add alternative_gpt_sector() block device operation which specifies
alternative location of a GPT entry. This allows us to support Android
devices that have GPT entry at a non-standard location and can't be
repartitioned easily.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Suggested-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
include/linux/blkdev.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 111a3911c4d2..d65c8f60ad8e 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1850,6 +1850,13 @@ struct block_device_operations {
char *(*devnode)(struct gendisk *disk, umode_t *mode);
struct module *owner;
const struct pr_ops *pr_ops;
+
+ /*
+ * Special callback for probing GPT entry at a given sector.
+ * Needed by Android devices, used by GPT scanner and MMC blk
+ * driver.
+ */
+ int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
};
#ifdef CONFIG_COMPAT
--
2.32.0
