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block: Add alternative_gpt_sector() operation

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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@lst.de>
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20210820004536.15791-2-digetx@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dmitry Osipenko 2021-08-20 03:45:33 +03:00 committed by Jens Axboe
parent d9cf3bd531
commit 0bdfbca8a6
1 changed files with 7 additions and 0 deletions
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7
include/linux/blkdev.h
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@ -1872,6 +1872,13 @@ 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