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Date: Mon, 15 Aug 2022 20:03:59 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Keith Busch <kbusch@...nel.org>,
Johannes Thumshirn <johannes.thumshirn@....com>,
Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0883/1157] block/bio: remove duplicate append pages code
From: Keith Busch <kbusch@...nel.org>
[ Upstream commit c58c0074c54c2e2bb3bb0d5a4d8896bb660cc8bc ]
The getting pages setup for zone append and normal IO are identical. Use
common code for each.
Signed-off-by: Keith Busch <kbusch@...nel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@....com>
Reviewed-by: Christoph Hellwig <hch@....de>
Link: https://lore.kernel.org/r/20220610195830.3574005-3-kbusch@fb.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
block/bio.c | 102 ++++++++++++++++++++++------------------------------
1 file changed, 42 insertions(+), 60 deletions(-)
diff --git a/block/bio.c b/block/bio.c
index d9ff51fc457e..ee5fe1bb015e 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -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 *))
/**
@@ -1177,7 +1208,6 @@ 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;
@@ -1186,7 +1216,7 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
* 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);
@@ -1196,18 +1226,18 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
for (left = size, i = 0; left > 0; left -= len, i++) {
struct page *page = pages[i];
+ int ret;
len = min_t(size_t, PAGE_SIZE - offset, left);
+ 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 (__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);
+ if (ret) {
+ bio_put_pages(pages + i, left, offset);
+ return ret;
}
offset = 0;
}
@@ -1216,51 +1246,6 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
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
- * 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];
- bool same_page = false;
-
- 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) {
- bio_put_pages(pages + i, left, offset);
- ret = -EINVAL;
- break;
- }
- if (same_page)
- put_page(page);
- offset = 0;
- }
-
- iov_iter_advance(iter, size - left);
- return ret;
-}
-
/**
* bio_iov_iter_get_pages - add user or kernel pages to a bio
* @bio: bio to add pages to
@@ -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 */
--
2.35.1
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