diff mbox series

[v3,17/19] md: raid1: check if adding pages to resync bio fails

Message ID 20230419140929.5924-18-jth@kernel.org (mailing list archive)
State New
Headers show
Series bio: check return values of bio_add_page | expand

Commit Message

Johannes Thumshirn April 19, 2023, 2:09 p.m. UTC 
From: Johannes Thumshirn <johannes.thumshirn@wdc.com>

Check if adding pages to resync bio fails and if bail out.

As the comment above suggests this cannot happen, WARN if it actually
happens.

This way we can mark bio_add_pages as __must_check.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
---
 drivers/md/raid1-10.c | 11 ++++++-----
 drivers/md/raid10.c   | 20 ++++++++++----------
 2 files changed, 16 insertions(+), 15 deletions(-)

Comments

Song Liu April 20, 2023, 4:39 a.m. UTC | #1 
On Wed, Apr 19, 2023 at 7:11 AM Johannes Thumshirn <jth@kernel.org> wrote:
>
> From: Johannes Thumshirn <johannes.thumshirn@wdc.com>
>
> Check if adding pages to resync bio fails and if bail out.
>
> As the comment above suggests this cannot happen, WARN if it actually
> happens.
>
> This way we can mark bio_add_pages as __must_check.
>
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

Acked-by: Song Liu <song@kernel.org>

Thanks!
diff mbox series

Patch

diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c
index e61f6cad4e08..cd349e69ed77 100644
--- a/drivers/md/raid1-10.c
+++ b/drivers/md/raid1-10.c
@@ -101,11 +101,12 @@  static void md_bio_reset_resync_pages(struct bio *bio, struct resync_pages *rp,
 		struct page *page = resync_fetch_page(rp, idx);
 		int len = min_t(int, size, PAGE_SIZE);
 
-		/*
-		 * won't fail because the vec table is big
-		 * enough to hold all these pages
-		 */
-		bio_add_page(bio, page, len, 0);
+		if (WARN_ON(!bio_add_page(bio, page, len, 0))) {
+			bio->bi_status = BLK_STS_RESOURCE;
+			bio_endio(bio);
+			return;
+		}
+
 		size -= len;
 	} while (idx++ < RESYNC_PAGES && size > 0);
 }
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 6c66357f92f5..59e52cf01569 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3804,11 +3804,11 @@  static sector_t raid10_sync_request(struct mddev *mddev, sector_t sector_nr,
 		for (bio= biolist ; bio ; bio=bio->bi_next) {
 			struct resync_pages *rp = get_resync_pages(bio);
 			page = resync_fetch_page(rp, page_idx);
-			/*
-			 * won't fail because the vec table is big enough
-			 * to hold all these pages
-			 */
-			bio_add_page(bio, page, len, 0);
+			if (WARN_ON(!bio_add_page(bio, page, len, 0))) {
+				bio->bi_status = BLK_STS_RESOURCE;
+				bio_endio(bio);
+				goto giveup;
+			}
 		}
 		nr_sectors += len>>9;
 		sector_nr += len>>9;
@@ -4985,11 +4985,11 @@  static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
 		if (len > PAGE_SIZE)
 			len = PAGE_SIZE;
 		for (bio = blist; bio ; bio = bio->bi_next) {
-			/*
-			 * won't fail because the vec table is big enough
-			 * to hold all these pages
-			 */
-			bio_add_page(bio, page, len, 0);
+			if (WARN_ON(!bio_add_page(bio, page, len, 0))) {
+				bio->bi_status = BLK_STS_RESOURCE;
+				bio_endio(bio);
+				return sectors_done;
+			}
 		}
 		sector_nr += len >> 9;
 		nr_sectors += len >> 9;