linux-master/block/blk-merge.c

103 static unsigned int bio_allowed_max_sectors(const struct queue_limits *lim)
105 	return round_down(UINT_MAX, lim->logical_block_size) >> SECTOR_SHIFT;
109 				     const struct queue_limits *lim,
118 	granularity = max(lim->discard_granularity >> 9, 1U);
121 		min(lim->max_discard_sectors, bio_allowed_max_sectors(lim));
136 		((lim->discard_alignment >> 9) % granularity);
146 					  const struct queue_limits *lim,
150 	if (!lim->max_write_zeroes_sectors)
152 	if (bio_sectors(bio) <= lim->max_write_zeroes_sectors)
154 	return bio_split(bio, lim->max_write_zeroes_sectors, GFP_NOIO, bs);
166 				       const struct queue_limits *lim)
168 	unsigned pbs = lim->physical_block_size >> SECTOR_SHIFT;
169 	unsigned lbs = lim->logical_block_size >> SECTOR_SHIFT;
170 	unsigned max_sectors = lim->max_sectors, start, end;
172 	if (lim->chunk_sectors) {
175 					       lim->chunk_sectors));
187  * @lim: Request queue limits.
193 static inline unsigned get_max_segment_size(const struct queue_limits *lim,
196 	unsigned long mask = lim->seg_boundary_mask;
204 	return min(mask - offset, (unsigned long)lim->max_segment_size - 1) + 1;
209  * @lim:      [in] queue limits to split based on
227 static bool bvec_split_segs(const struct queue_limits *lim,
237 		seg_size = get_max_segment_size(lim, bv->bv_page,
245 		if ((bv->bv_offset + total_len) & lim->virt_boundary_mask)
258  * @lim:  [in] queue limits to split based on
275 struct bio *bio_split_rw(struct bio *bio, const struct queue_limits *lim,
287 		if (bvprvp && bvec_gap_to_prev(lim, bvprvp, bv.bv_offset))
290 		if (nsegs < lim->max_segments &&
296 			if (bvec_split_segs(lim, &bv, &nsegs, &bytes,
297 					lim->max_segments, max_bytes))
325 	bytes = ALIGN_DOWN(bytes, lim->logical_block_size);
340  * @lim:     queue limits to split based on
351 				  const struct queue_limits *lim,
360 		split = bio_split_discard(bio, lim, nr_segs, bs);
363 		split = bio_split_write_zeroes(bio, lim, nr_segs, bs);
366 		split = bio_split_rw(bio, lim, nr_segs, bs,
367 				get_max_io_size(bio, lim) << SECTOR_SHIFT);
399 	const struct queue_limits *lim = &bdev_get_queue(bio->bi_bdev)->limits;
402 	if (bio_may_exceed_limits(bio, lim))
403 		return __bio_split_to_limits(bio, lim, &nr_segs);