block: Implement support for WRITE SAME

[firefly-linux-kernel-4.4.55.git] / fs / bio.c

diff --git a/fs/bio.c b/fs/bio.c
index 13e956779e1052ee17fbac6a9aafb5923b880977..f855e0e1869cc5d85ddcfb4ed612a2582ac03355 100644 (file)
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -1487,9 +1487,12 @@ struct bio_pair *bio_split(struct bio *bi, int first_sectors)
 
        bp->bv1 = bi->bi_io_vec[0];
        bp->bv2 = bi->bi_io_vec[0];
-       bp->bv2.bv_offset += first_sectors << 9;
-       bp->bv2.bv_len -= first_sectors << 9;
-       bp->bv1.bv_len = first_sectors << 9;
+
+       if (bio_is_rw(bi)) {
+               bp->bv2.bv_offset += first_sectors << 9;
+               bp->bv2.bv_len -= first_sectors << 9;
+               bp->bv1.bv_len = first_sectors << 9;
+       }
 
        bp->bio1.bi_io_vec = &bp->bv1;
        bp->bio2.bi_io_vec = &bp->bv2;