blk-core: use pr_warn_ratelimited() in bio_check_ro()

If one of the underlying disks of raid or dm is set to read-only, then
each io will generate new log, which will cause message storm. This
environment is indeed problematic, however we can't make sure our
naive custormer won't do this, hence use pr_warn_ratelimited() to
prevent message storm in this case.

Signed-off-by: Yu Kuai <[email protected]>
Fixes: 57e95e4670d1 ("block: fix and cleanup bio_check_ro")
Signed-off-by: Ye Bin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

diff --git a/block/blk-core.c b/block/blk-core.c
index 9d51e9894ece782e10ebf5a415076db61d9d061c..fdf25b8d6e784f9904ee7892277acdb25430f3d3 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -501,8 +501,8 @@ static inline void bio_check_ro(struct bio *bio)
        if (op_is_write(bio_op(bio)) && bdev_read_only(bio->bi_bdev)) {
                if (op_is_flush(bio->bi_opf) && !bio_sectors(bio))
                        return;
-               pr_warn("Trying to write to read-only block-device %pg\n",
-                       bio->bi_bdev);
+               pr_warn_ratelimited("Trying to write to read-only block-device %pg\n",
+                                   bio->bi_bdev);
                /* Older lvm-tools actually trigger this */
        }
 }