block: inherit BIO_REMAPPED when cloning bios

Cloned bios are can be used to on the same device, in which case we need
to inherit the BIO_REMAPPED flag to avoid a double partition remap.  When
the cloned bios are used on another device, bio_set_dev will clear the flag.

Fixes: 309dca309fc3 ("block: store a block_device pointer in struct bio")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/bio.c b/block/bio.c
index 99040a7..dfd7740 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -666,6 +666,8 @@ void __bio_clone_fast(struct bio *bio, struct bio *bio_src)
        bio_set_flag(bio, BIO_CLONED);
        if (bio_flagged(bio_src, BIO_THROTTLED))
                bio_set_flag(bio, BIO_THROTTLED);
+       if (bio_flagged(bio_src, BIO_REMAPPED))
+               bio_set_flag(bio, BIO_REMAPPED);
        bio->bi_opf = bio_src->bi_opf;
        bio->bi_ioprio = bio_src->bi_ioprio;
        bio->bi_write_hint = bio_src->bi_write_hint;

diff --git a/block/blk-crypto-fallback.c b/block/blk-crypto-fallback.c
index 8f1e181..50c2253 100644 (file)
--- a/block/blk-crypto-fallback.c
+++ b/block/blk-crypto-fallback.c
@@ -168,6 +168,8 @@ static struct bio *blk_crypto_clone_bio(struct bio *bio_src)
        if (!bio)
                return NULL;
        bio->bi_bdev            = bio_src->bi_bdev;
+       if (bio_flagged(bio_src, BIO_REMAPPED))
+               bio_set_flag(bio, BIO_REMAPPED);
        bio->bi_opf             = bio_src->bi_opf;
        bio->bi_ioprio          = bio_src->bi_ioprio;
        bio->bi_write_hint      = bio_src->bi_write_hint;

diff --git a/block/bounce.c b/block/bounce.c
index a22a8a1..fc55314 100644 (file)
--- a/block/bounce.c
+++ b/block/bounce.c
@@ -247,6 +247,8 @@ static struct bio *bounce_clone_bio(struct bio *bio_src, gfp_t gfp_mask,
        if (!bio)
                return NULL;
        bio->bi_bdev            = bio_src->bi_bdev;
+       if (bio_flagged(bio_src, BIO_REMAPPED))
+               bio_set_flag(bio, BIO_REMAPPED);
        bio->bi_opf             = bio_src->bi_opf;
        bio->bi_ioprio          = bio_src->bi_ioprio;
        bio->bi_write_hint      = bio_src->bi_write_hint;