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block: add a sb_open_mode helper

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Add a helper to return the open flags for blkdev_get_by* for passed in
super block flags instead of open coding the logic in many places.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Acked-by: Christian Brauner <brauner@kernel.org>
Link: https://lore.kernel.org/r/20230608110258.189493-17-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2023-06-08 13:02:44 +02:00
committed by Jens Axboe
parent 2736e8eeb0
commit 3f0b3e785e
4 changed files with 14 additions and 20 deletions
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7
include/linux/blkdev.h
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@@ -1473,6 +1473,13 @@ struct blk_holder_ops {
void (*mark_dead)(struct block_device *bdev);
};
/*
* Return the correct open flags for blkdev_get_by_* for super block flags
* as stored in sb->s_flags.
*/
#define sb_open_mode(flags) \
(FMODE_READ | (((flags) & SB_RDONLY) ? 0 : FMODE_WRITE))
struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder,
const struct blk_holder_ops *hops);
struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,