1 files changed, 0 insertions, 267 deletions
diff --git a/block/bounce.c b/block/bounce.c
deleted file mode 100644
index 09a9616cf209..000000000000
--- a/block/bounce.c
+++ /dev/null
@@ -1,267 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* bounce buffer handling for block devices
- *
- * - Split from highmem.c
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/mm.h>
-#include <linux/export.h>
-#include <linux/swap.h>
-#include <linux/gfp.h>
-#include <linux/bio-integrity.h>
-#include <linux/pagemap.h>
-#include <linux/mempool.h>
-#include <linux/blkdev.h>
-#include <linux/backing-dev.h>
-#include <linux/init.h>
-#include <linux/hash.h>
-#include <linux/highmem.h>
-#include <linux/printk.h>
-#include <asm/tlbflush.h>
-
-#include <trace/events/block.h>
-#include "blk.h"
-#include "blk-cgroup.h"
-
-#define POOL_SIZE	64
-#define ISA_POOL_SIZE	16
-
-static struct bio_set bounce_bio_set, bounce_bio_split;
-static mempool_t page_pool;
-
-static void init_bounce_bioset(void)
-{
-	static bool bounce_bs_setup;
-	int ret;
-
-	if (bounce_bs_setup)
-		return;
-
-	ret = bioset_init(&bounce_bio_set, BIO_POOL_SIZE, 0, BIOSET_NEED_BVECS);
-	BUG_ON(ret);
-
-	ret = bioset_init(&bounce_bio_split, BIO_POOL_SIZE, 0, 0);
-	BUG_ON(ret);
-	bounce_bs_setup = true;
-}
-
-static __init int init_emergency_pool(void)
-{
-	int ret;
-
-#ifndef CONFIG_MEMORY_HOTPLUG
-	if (max_pfn <= max_low_pfn)
-		return 0;
-#endif
-
-	ret = mempool_init_page_pool(&page_pool, POOL_SIZE, 0);
-	BUG_ON(ret);
-	pr_info("pool size: %d pages\n", POOL_SIZE);
-
-	init_bounce_bioset();
-	return 0;
-}
-
-__initcall(init_emergency_pool);
-
-/*
- * Simple bounce buffer support for highmem pages. Depending on the
- * queue gfp mask set, *to may or may not be a highmem page. kmap it
- * always, it will do the Right Thing
- */
-static void copy_to_high_bio_irq(struct bio *to, struct bio *from)
-{
-	struct bio_vec tovec, fromvec;
-	struct bvec_iter iter;
-	/*
-	 * The bio of @from is created by bounce, so we can iterate
-	 * its bvec from start to end, but the @from->bi_iter can't be
-	 * trusted because it might be changed by splitting.
-	 */
-	struct bvec_iter from_iter = BVEC_ITER_ALL_INIT;
-
-	bio_for_each_segment(tovec, to, iter) {
-		fromvec = bio_iter_iovec(from, from_iter);
-		if (tovec.bv_page != fromvec.bv_page) {
-			/*
-			 * fromvec->bv_offset and fromvec->bv_len might have
-			 * been modified by the block layer, so use the original
-			 * copy, bounce_copy_vec already uses tovec->bv_len
-			 */
-			memcpy_to_bvec(&tovec, page_address(fromvec.bv_page) +
-				       tovec.bv_offset);
-		}
-		bio_advance_iter(from, &from_iter, tovec.bv_len);
-	}
-}
-
-static void bounce_end_io(struct bio *bio)
-{
-	struct bio *bio_orig = bio->bi_private;
-	struct bio_vec *bvec, orig_vec;
-	struct bvec_iter orig_iter = bio_orig->bi_iter;
-	struct bvec_iter_all iter_all;
-
-	/*
-	 * free up bounce indirect pages used
-	 */
-	bio_for_each_segment_all(bvec, bio, iter_all) {
-		orig_vec = bio_iter_iovec(bio_orig, orig_iter);
-		if (bvec->bv_page != orig_vec.bv_page) {
-			dec_zone_page_state(bvec->bv_page, NR_BOUNCE);
-			mempool_free(bvec->bv_page, &page_pool);
-		}
-		bio_advance_iter(bio_orig, &orig_iter, orig_vec.bv_len);
-	}
-
-	bio_orig->bi_status = bio->bi_status;
-	bio_endio(bio_orig);
-	bio_put(bio);
-}
-
-static void bounce_end_io_write(struct bio *bio)
-{
-	bounce_end_io(bio);
-}
-
-static void bounce_end_io_read(struct bio *bio)
-{
-	struct bio *bio_orig = bio->bi_private;
-
-	if (!bio->bi_status)
-		copy_to_high_bio_irq(bio_orig, bio);
-
-	bounce_end_io(bio);
-}
-
-static struct bio *bounce_clone_bio(struct bio *bio_src)
-{
-	struct bvec_iter iter;
-	struct bio_vec bv;
-	struct bio *bio;
-
-	/*
-	 * Pre immutable biovecs, __bio_clone() used to just do a memcpy from
-	 * bio_src->bi_io_vec to bio->bi_io_vec.
-	 *
-	 * We can't do that anymore, because:
-	 *
-	 *  - The point of cloning the biovec is to produce a bio with a biovec
-	 *    the caller can modify: bi_idx and bi_bvec_done should be 0.
-	 *
-	 *  - The original bio could've had more than BIO_MAX_VECS biovecs; if
-	 *    we tried to clone the whole thing bio_alloc_bioset() would fail.
-	 *    But the clone should succeed as long as the number of biovecs we
-	 *    actually need to allocate is fewer than BIO_MAX_VECS.
-	 *
-	 *  - Lastly, bi_vcnt should not be looked at or relied upon by code
-	 *    that does not own the bio - reason being drivers don't use it for
-	 *    iterating over the biovec anymore, so expecting it to be kept up
-	 *    to date (i.e. for clones that share the parent biovec) is just
-	 *    asking for trouble and would force extra work.
-	 */
-	bio = bio_alloc_bioset(bio_src->bi_bdev, bio_segments(bio_src),
-			       bio_src->bi_opf, GFP_NOIO, &bounce_bio_set);
-	if (bio_flagged(bio_src, BIO_REMAPPED))
-		bio_set_flag(bio, BIO_REMAPPED);
-	bio->bi_ioprio		= bio_src->bi_ioprio;
-	bio->bi_write_hint	= bio_src->bi_write_hint;
-	bio->bi_iter.bi_sector	= bio_src->bi_iter.bi_sector;
-	bio->bi_iter.bi_size	= bio_src->bi_iter.bi_size;
-
-	switch (bio_op(bio)) {
-	case REQ_OP_DISCARD:
-	case REQ_OP_SECURE_ERASE:
-	case REQ_OP_WRITE_ZEROES:
-		break;
-	default:
-		bio_for_each_segment(bv, bio_src, iter)
-			bio->bi_io_vec[bio->bi_vcnt++] = bv;
-		break;
-	}
-
-	if (bio_crypt_clone(bio, bio_src, GFP_NOIO) < 0)
-		goto err_put;
-
-	if (bio_integrity(bio_src) &&
-	    bio_integrity_clone(bio, bio_src, GFP_NOIO) < 0)
-		goto err_put;
-
-	bio_clone_blkg_association(bio, bio_src);
-
-	return bio;
-
-err_put:
-	bio_put(bio);
-	return NULL;
-}
-
-struct bio *__blk_queue_bounce(struct bio *bio_orig, struct request_queue *q)
-{
-	struct bio *bio;
-	int rw = bio_data_dir(bio_orig);
-	struct bio_vec *to, from;
-	struct bvec_iter iter;
-	unsigned i = 0, bytes = 0;
-	bool bounce = false;
-	int sectors;
-
-	bio_for_each_segment(from, bio_orig, iter) {
-		if (i++ < BIO_MAX_VECS)
-			bytes += from.bv_len;
-		if (PageHighMem(from.bv_page))
-			bounce = true;
-	}
-	if (!bounce)
-		return bio_orig;
-
-	/*
-	 * Individual bvecs might not be logical block aligned. Round down
-	 * the split size so that each bio is properly block size aligned,
-	 * even if we do not use the full hardware limits.
-	 */
-	sectors = ALIGN_DOWN(bytes, queue_logical_block_size(q)) >>
-			SECTOR_SHIFT;
-	if (sectors < bio_sectors(bio_orig)) {
-		bio = bio_split(bio_orig, sectors, GFP_NOIO, &bounce_bio_split);
-		bio_chain(bio, bio_orig);
-		submit_bio_noacct(bio_orig);
-		bio_orig = bio;
-	}
-	bio = bounce_clone_bio(bio_orig);
-
-	/*
-	 * Bvec table can't be updated by bio_for_each_segment_all(),
-	 * so retrieve bvec from the table directly. This way is safe
-	 * because the 'bio' is single-page bvec.
-	 */
-	for (i = 0, to = bio->bi_io_vec; i < bio->bi_vcnt; to++, i++) {
-		struct page *bounce_page;
-
-		if (!PageHighMem(to->bv_page))
-			continue;
-
-		bounce_page = mempool_alloc(&page_pool, GFP_NOIO);
-		inc_zone_page_state(bounce_page, NR_BOUNCE);
-
-		if (rw == WRITE) {
-			flush_dcache_page(to->bv_page);
-			memcpy_from_bvec(page_address(bounce_page), to);
-		}
-		to->bv_page = bounce_page;
-	}
-
-	trace_block_bio_bounce(bio_orig);
-
-	bio->bi_flags |= (1 << BIO_BOUNCED);
-
-	if (rw == READ)
-		bio->bi_end_io = bounce_end_io_read;
-	else
-		bio->bi_end_io = bounce_end_io_write;
-
-	bio->bi_private = bio_orig;
-	return bio;
-}