block: Add bio_reset()

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / bio.c

diff --git a/fs/bio.c b/fs/bio.c
index b14f71a..919ee9a 100644 (file)
--- 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