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block/bio: remove duplicate append pages code 

The getting pages setup for zone append and normal IO are identical. Use
common code for each.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220610195830.3574005-3-kbusch@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch 2022-06-10 12:58:21 -07:00 committed by Jens Axboe
parent b82d9fa257
commit c58c0074c5
1 changed files with 43 additions and 61 deletions
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104
block/bio.c
View File

@ -1159,6 +1159,37 @@ static void bio_put_pages(struct page **pages, size_t size, size_t off)
put_page(pages[i]);
}
static int bio_iov_add_page(struct bio *bio, struct page *page,
unsigned int len, unsigned int offset)
{
bool same_page = false;
if (!__bio_try_merge_page(bio, page, len, offset, &same_page)) {
if (WARN_ON_ONCE(bio_full(bio, len)))
return -EINVAL;
__bio_add_page(bio, page, len, offset);
return 0;
}
if (same_page)
put_page(page);
return 0;
}
static int bio_iov_add_zone_append_page(struct bio *bio, struct page *page,
unsigned int len, unsigned int offset)
{
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
bool same_page = false;
if (bio_add_hw_page(q, bio, page, len, offset,
queue_max_zone_append_sectors(q), &same_page) != len)
return -EINVAL;
if (same_page)
put_page(page);
return 0;
}
#define PAGE_PTRS_PER_BVEC (sizeof(struct bio_vec) / sizeof(struct page *))
/**
@ -1177,58 +1208,10 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
unsigned short entries_left = bio->bi_max_vecs - bio->bi_vcnt;
struct bio_vec *bv = bio->bi_io_vec + bio->bi_vcnt;
struct page **pages = (struct page **)bv;
bool same_page = false;
ssize_t size, left;
unsigned len, i;
size_t offset;
/*
* Move page array up in the allocated memory for the bio vecs as far as
* possible so that we can start filling biovecs from the beginning
* without overwriting the temporary page array.
*/
BUILD_BUG_ON(PAGE_PTRS_PER_BVEC < 2);
pages += entries_left * (PAGE_PTRS_PER_BVEC - 1);
size = iov_iter_get_pages(iter, pages, LONG_MAX, nr_pages, &offset);
if (unlikely(size <= 0))
return size ? size : -EFAULT;
for (left = size, i = 0; left > 0; left -= len, i++) {
struct page *page = pages[i];
len = min_t(size_t, PAGE_SIZE - offset, left);
if (__bio_try_merge_page(bio, page, len, offset, &same_page)) {
if (same_page)
put_page(page);
} else {
if (WARN_ON_ONCE(bio_full(bio, len))) {
bio_put_pages(pages + i, left, offset);
return -EINVAL;
}
__bio_add_page(bio, page, len, offset);
}
offset = 0;
}
iov_iter_advance(iter, size);
return 0;
}
static int __bio_iov_append_get_pages(struct bio *bio, struct iov_iter *iter)
{
unsigned short nr_pages = bio->bi_max_vecs - bio->bi_vcnt;
unsigned short entries_left = bio->bi_max_vecs - bio->bi_vcnt;
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
unsigned int max_append_sectors = queue_max_zone_append_sectors(q);
struct bio_vec *bv = bio->bi_io_vec + bio->bi_vcnt;
struct page **pages = (struct page **)bv;
ssize_t size, left;
unsigned len, i;
size_t offset;
int ret = 0;
/*
* Move page array up in the allocated memory for the bio vecs as far as
* possible so that we can start filling biovecs from the beginning
@ -1243,22 +1226,24 @@ static int __bio_iov_append_get_pages(struct bio *bio, struct iov_iter *iter)
for (left = size, i = 0; left > 0; left -= len, i++) {
struct page *page = pages[i];
bool same_page = false;
int ret;
len = min_t(size_t, PAGE_SIZE - offset, left);
if (bio_add_hw_page(q, bio, page, len, offset,
max_append_sectors, &same_page) != len) {
if (bio_op(bio) == REQ_OP_ZONE_APPEND)
ret = bio_iov_add_zone_append_page(bio, page, len,
offset);
else
ret = bio_iov_add_page(bio, page, len, offset);
if (ret) {
bio_put_pages(pages + i, left, offset);
ret = -EINVAL;
break;
return ret;
}
if (same_page)
put_page(page);
offset = 0;
}
iov_iter_advance(iter, size - left);
return ret;
iov_iter_advance(iter, size);
return 0;
}
/**
@ -1295,10 +1280,7 @@ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
}
do {
if (bio_op(bio) == REQ_OP_ZONE_APPEND)
ret = __bio_iov_append_get_pages(bio, iter);
else
ret = __bio_iov_iter_get_pages(bio, iter);
ret = __bio_iov_iter_get_pages(bio, iter);
} while (!ret && iov_iter_count(iter) && !bio_full(bio, 0));
/* don't account direct I/O as memory stall */