blk-merge.c (4d633062c1c0794a6b3836b7b55afba4599736e8) blk-merge.c (48d7727cae1209235700ed90f8f11426027b333b)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Functions related to segment and merge handling
4 */
5#include <linux/kernel.h>
6#include <linux/module.h>
7#include <linux/bio.h>
8#include <linux/blkdev.h>

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442 return 1;
443
444 bio_get_last_bvec(bio, &end_bv);
445 bio_get_first_bvec(nxt, &nxt_bv);
446
447 return biovec_phys_mergeable(q, &end_bv, &nxt_bv);
448}
449
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Functions related to segment and merge handling
4 */
5#include <linux/kernel.h>
6#include <linux/module.h>
7#include <linux/bio.h>
8#include <linux/blkdev.h>

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442 return 1;
443
444 bio_get_last_bvec(bio, &end_bv);
445 bio_get_first_bvec(nxt, &nxt_bv);
446
447 return biovec_phys_mergeable(q, &end_bv, &nxt_bv);
448}
449
450static struct scatterlist *blk_next_sg(struct scatterlist **sg,
450static inline struct scatterlist *blk_next_sg(struct scatterlist **sg,
451 struct scatterlist *sglist)
452{
453 if (!*sg)
454 return sglist;
455
456 /*
457 * If the driver previously mapped a shorter list, we could see a
458 * termination bit prematurely unless it fully inits the sg table

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507 if ((*sg)->length + nbytes > queue_max_segment_size(q))
508 goto new_segment;
509 if (!biovec_phys_mergeable(q, bvprv, bvec))
510 goto new_segment;
511
512 (*sg)->length += nbytes;
513 } else {
514new_segment:
451 struct scatterlist *sglist)
452{
453 if (!*sg)
454 return sglist;
455
456 /*
457 * If the driver previously mapped a shorter list, we could see a
458 * termination bit prematurely unless it fully inits the sg table

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507 if ((*sg)->length + nbytes > queue_max_segment_size(q))
508 goto new_segment;
509 if (!biovec_phys_mergeable(q, bvprv, bvec))
510 goto new_segment;
511
512 (*sg)->length += nbytes;
513 } else {
514new_segment:
515 (*nsegs) += blk_bvec_map_sg(q, bvec, sglist, sg);
515 if (bvec->bv_offset + bvec->bv_len <= PAGE_SIZE) {
516 *sg = blk_next_sg(sg, sglist);
517 sg_set_page(*sg, bvec->bv_page, nbytes, bvec->bv_offset);
518 (*nsegs) += 1;
519 } else
520 (*nsegs) += blk_bvec_map_sg(q, bvec, sglist, sg);
516 }
517 *bvprv = *bvec;
518}
519
520static inline int __blk_bvec_map_sg(struct request_queue *q, struct bio_vec bv,
521 struct scatterlist *sglist, struct scatterlist **sg)
522{
523 *sg = sglist;

--- 442 unchanged lines hidden --- 		521 }
522 *bvprv = *bvec;
523}
524
525static inline int __blk_bvec_map_sg(struct request_queue *q, struct bio_vec bv,
526 struct scatterlist *sglist, struct scatterlist **sg)
527{
528 *sg = sglist;

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