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[v2,18/19] dm-crypt: check if adding pages to clone bio fails

Message ID 84973c41d58473dd50324853fb88a7fcff55745b.1680172791.git.johannes.thumshirn@wdc.com (mailing list archive)
State Superseded, archived
Delegated to: Mike Snitzer
Headers show
Series bio: check return values of bio_add_page | expand

Commit Message

Johannes Thumshirn March 30, 2023, 10:44 a.m. UTC 
Check if adding pages to clone bio fails and if it does retry with
reclaim. This mirrors the behaviour of page allocation in
crypt_alloc_buffer().

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/dm-crypt.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 3ba53dc3cc3f..19f7e087c6df 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -1693,7 +1693,14 @@  static struct bio *crypt_alloc_buffer(struct dm_crypt_io *io, unsigned int size)
 
 		len = (remaining_size > PAGE_SIZE) ? PAGE_SIZE : remaining_size;
 
-		bio_add_page(clone, page, len, 0);
+		if (!bio_add_page(clone, page, len, 0)) {
+			mempool_free(page, &cc->page_pool);
+			crypt_free_buffer_pages(cc, clone);
+			bio_put(clone);
+			gfp_mask |= __GFP_DIRECT_RECLAIM;
+			goto retry;
+
+		}
 
 		remaining_size -= len;
 	}