diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-10-18 12:11:01 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-10-18 14:43:22 -0600 |
| commit | 99457db8b40c66941072a383a5ab4e36bc53fd3d (patch) | |
| tree | 97852136e6faa2a3a5a5afa7ff43342c1ccd9be4 /include/linux/blk_types.h | |
| parent | 4f5022453acd0f7b28012e20b7d048470f129894 (diff) | |
block: move the SECTOR_SIZE related definitions to blk_types.h
Ensure these are always available for inlines in the various block layer
headers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20211018101130.1838532-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blk_types.h')
| -rw-r--r-- | include/linux/blk_types.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 1e370929c89e..472e55e0e94f 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -20,6 +20,23 @@ struct cgroup_subsys_state; typedef void (bio_end_io_t) (struct bio *); struct bio_crypt_ctx; +/* + * The basic unit of block I/O is a sector. It is used in a number of contexts + * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 + * bytes. Variables of type sector_t represent an offset or size that is a + * multiple of 512 bytes. Hence these two constants. + */ +#ifndef SECTOR_SHIFT +#define SECTOR_SHIFT 9 +#endif +#ifndef SECTOR_SIZE +#define SECTOR_SIZE (1 << SECTOR_SHIFT) +#endif + +#define PAGE_SECTORS_SHIFT (PAGE_SHIFT - SECTOR_SHIFT) +#define PAGE_SECTORS (1 << PAGE_SECTORS_SHIFT) +#define SECTOR_MASK (PAGE_SECTORS - 1) + struct block_device { sector_t bd_start_sect; struct disk_stats __percpu *bd_stats; |