Add a helper to a clear a bio for reissue without a lot of the
pointless clearing and reinitializing done by bio_reset and bio_reuse,
and keeping the page pinning flag intact.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/bio.c | 20 ++++++++++++++++++++
include/linux/bio.h | 1 +
2 files changed, 21 insertions(+)
diff --git a/block/bio.c b/block/bio.c
index 5792a059ef2a..7f7654e60dd4 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -320,6 +320,26 @@ void bio_reuse(struct bio *bio, blk_opf_t opf)
}
EXPORT_SYMBOL_GPL(bio_reuse);
+/**
+ * bio_prepare_reissue - prepare a bio for reuissing the original I/O
+ * @bio: bio to reuse
+ * @bdev: block device to use the bio for
+ *
+ * Prepare @bio to be resubmitted to retry the original operation.
+ * The caller must reset bio->bi_iter to the original state.
+ */
+void bio_prepare_reissue(struct bio *bio, struct block_device *bdev)
+{
+ bio->bi_bdev = bdev;
+ bio_associate_blkg(bio);
+ bio->bi_flags &=
+ (BIO_PAGE_PINNED | BIO_CLONED | BIO_QUIET | BIO_REFFED);
+ bio->bi_status = BLK_STS_OK;
+ bio->bi_bvec_gap_bit = 0;
+ atomic_set(&bio->__bi_remaining, 1);
+}
+EXPORT_SYMBOL_GPL(bio_prepare_reissue);
+
static struct bio *__bio_chain_endio(struct bio *bio)
{
struct bio *parent = bio->bi_private;diff --git a/include/linux/bio.h b/include/linux/bio.h
index 584b6abf6baf..bfa3c0e97b6f 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -479,6 +479,7 @@ static inline void bio_init_inline(struct bio *bio, struct block_device *bdev,
extern void bio_uninit(struct bio *);
void bio_reset(struct bio *bio, struct block_device *bdev, blk_opf_t opf);
void bio_reuse(struct bio *bio, blk_opf_t opf);
+void bio_prepare_reissue(struct bio *bio, struct block_device *bdev);
void bio_chain(struct bio *, struct bio *);
void bio_await(struct bio *bio, void *priv,
void (*submit)(struct bio *bio, void *priv));
--
2.53.0