1 files changed, 24 insertions, 0 deletions

diff --git a/fs/bio.c b/fs/bio.c
index b14f71adff4..919ee9aa5c5 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -263,6 +263,30 @@ void bio_init(struct bio *bio)
 EXPORT_SYMBOL(bio_init);
 
 /**
+ * bio_reset - reinitialize a bio
+ * @bio:        bio to reset
+ *
+ * Description:
+ *   After calling bio_reset(), @bio will be in the same state as a freshly
+ *   allocated bio returned bio bio_alloc_bioset() - the only fields that are
+ *   preserved are the ones that are initialized by bio_alloc_bioset(). See
+ *   comment in struct bio.
+ */
+void bio_reset(struct bio *bio)
+{
+        unsigned long flags = bio->bi_flags & (~0UL << BIO_RESET_BITS);
+
+        if (bio_integrity(bio))
+                bio_integrity_free(bio);
+
+        bio_disassociate_task(bio);
+
+        memset(bio, 0, BIO_RESET_BYTES);
+        bio->bi_flags = flags|(1 << BIO_UPTODATE);
+}
+EXPORT_SYMBOL(bio_reset);
+
+/**
  * bio_alloc_bioset - allocate a bio for I/O
  * @gfp_mask:   the GFP_ mask given to the slab allocator
  * @nr_iovecs:  number of iovecs to pre-allocate