mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
513616843d
blkcg_bio_issue_init is called in submit_bio. There is no need to have extra calls that just get overriden in __bio_clone and the two places that copy and pasted from it. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Mike Snitzer <snitzer@kernel.org> Link: https://lore.kernel.org/r/20220504142950.567582-2-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
261 lines
6.5 KiB
C
261 lines
6.5 KiB
C
// 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.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);
|
|
if (bioset_integrity_create(&bounce_bio_set, BIO_POOL_SIZE))
|
|
BUG_ON(1);
|
|
|
|
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_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;
|
|
}
|
|
|
|
void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
|
|
{
|
|
struct bio *bio;
|
|
int rw = bio_data_dir(*bio_orig);
|
|
struct bio_vec *to, from;
|
|
struct bvec_iter iter;
|
|
unsigned i = 0;
|
|
bool bounce = false;
|
|
int sectors = 0;
|
|
|
|
bio_for_each_segment(from, *bio_orig, iter) {
|
|
if (i++ < BIO_MAX_VECS)
|
|
sectors += from.bv_len >> 9;
|
|
if (PageHighMem(from.bv_page))
|
|
bounce = true;
|
|
}
|
|
if (!bounce)
|
|
return;
|
|
|
|
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;
|
|
*bio_orig = bio;
|
|
}
|