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| author | Ming Lei <ming.lei@canonical.com> | 2016-05-30 21:34:30 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-06-09 10:02:47 -0600 |
| commit | 0781e79eb206a62c30cc3eff75aaa889cd85b276 (patch) | |
| tree | 19bae7f4fe30e974076ab8655399aefdd7574dae /include/linux/bvec.h | |
| parent | 8fc554552c9d89e7bf76cd4cbc0085648bf3125b (diff) | |
| download | lwn-0781e79eb206a62c30cc3eff75aaa889cd85b276.tar.gz lwn-0781e79eb206a62c30cc3eff75aaa889cd85b276.zip | |
block: move two bvec structure into bvec.h
This patch moves 'struct bio_vec' and 'struct bvec_iter'
into 'include/linux/bvec.h', then always include this header
into 'include/linux/blk_types.h'.
With this change, both 'struct bvec_iter' and bvec iterator
helpers don't depend on CONFIG_BLOCK any more, then we can
use bvec iterator to implement iterate_bvec(): lib/iov_iter.c.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Tested-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/bvec.h')
| -rw-r--r-- | include/linux/bvec.h | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/include/linux/bvec.h b/include/linux/bvec.h index 29c459da277e..096efd2c83e5 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -20,7 +20,28 @@ #ifndef __LINUX_BVEC_ITER_H #define __LINUX_BVEC_ITER_H -#include <linux/blk_types.h> +#include <linux/kernel.h> +#include <linux/bug.h> + +/* + * was unsigned short, but we might as well be ready for > 64kB I/O pages + */ +struct bio_vec { + struct page *bv_page; + unsigned int bv_len; + unsigned int bv_offset; +}; + +struct bvec_iter { + sector_t bi_sector; /* device address in 512 byte + sectors */ + unsigned int bi_size; /* residual I/O count */ + + unsigned int bi_idx; /* current index into bvl_vec */ + + unsigned int bi_bvec_done; /* number of bytes completed in + current bvec */ +}; /* * various member access, note that bio_data should of course not be used |