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block: add a sb_bdev_nr_blocks helper

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Add a helper to return the size of sb->s_bdev in sb->s_blocksize_bits
based unites.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20211018101130.1838532-26-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-10-18 12:11:25 +02:00 • committed by Jens Axboe
parent 2a93ad8fcb
commit bcc6e2cfaa
1 changed files with 6 additions and 0 deletions
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6
include/linux/genhd.h
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@ -251,6 +251,12 @@ static inline sector_t get_capacity(struct gendisk *disk)
return bdev_nr_sectors(disk->part0); return bdev_nr_sectors(disk->part0);
} }
static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
{
return bdev_nr_sectors(sb->s_bdev) >>
(sb->s_blocksize_bits - SECTOR_SHIFT);
}
int bdev_disk_changed(struct gendisk *disk, bool invalidate); int bdev_disk_changed(struct gendisk *disk, bool invalidate);
void blk_drop_partitions(struct gendisk *disk); void blk_drop_partitions(struct gendisk *disk);