diff options
| -rw-r--r-- | fs/iomap/direct-io.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index 8c1bec473586..b9f59ca43c15 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -350,6 +350,11 @@ static int iomap_dio_bio_iter(struct iomap_iter *iter, struct iomap_dio *dio) bio_opf |= REQ_OP_WRITE; if (iter->flags & IOMAP_ATOMIC_HW) { + /* + * Ensure that the mapping covers the full write + * length, otherwise it won't be submitted as a single + * bio, which is required to use hardware atomics. + */ if (length != iter->len) return -EINVAL; bio_opf |= REQ_ATOMIC; @@ -449,7 +454,7 @@ static int iomap_dio_bio_iter(struct iomap_iter *iter, struct iomap_dio *dio) n = bio->bi_iter.bi_size; if (WARN_ON_ONCE((bio_opf & REQ_ATOMIC) && n != length)) { /* - * This bio should have covered the complete length, + * An atomic write bio must cover the complete length, * which it doesn't, so error. We may need to zero out * the tail (complete FS block), similar to when * bio_iov_iter_get_pages() returns an error, above. |