From 0c67dd644176092d47b97215daca830c6ee0db18 Mon Sep 17 00:00:00 2001
From: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Date: Wed, 31 May 2023 04:50:38 -0700
Subject: [PATCH] md: raid1: check if adding pages to resync bio fails
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. Technically __bio_add_pages() would be sufficient here, but
asserting the pages actually get added to the bio is preferred.
This way we can mark bio_add_pages as __must_check.
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/33aea4c271220dc9bcab58c4b7bec478c1511142.1685532726.git.johannes.thumshirn@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
drivers/md/raid1-10.c | 11 ++++++-----
drivers/md/raid10.c | 20 ++++++++++----------
2 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c
index e61f6cad4e08e..cd349e69ed775 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 4fcfcb350d2b4..381c21f7fb062 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3819,11 +3819,11 @@ 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;
@@ -4997,11 +4997,11 @@ 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;
--
GitLab