[sheepdog] [PATCH 2/2] sbd: make rq_for_each_segment happy for all the kernel version

[Liu Yuan]

Signed-off-by: Liu Yuan <namei.u...@gmail.com>
---
 sbd/sheep.c | 35 +++++++++++++++++++++++++----------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/sbd/sheep.c b/sbd/sheep.c
index 56b6e23..746f0ea 100644
--- a/sbd/sheep.c
+++ b/sbd/sheep.c
@@ -336,10 +336,24 @@ static void aio_write_done(struct sheep_aiocb *aiocb)
        free_sheep_aiocb(aiocb);
 }
 
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(3, 14, 0)
+
+# define DEFINE_BVEC(x) struct bio_vec *x
+# define BVEC_ADDR(x) x
+# define BVEC_FIELD(x, y) x->y
+
+#else
+
+# define DEFINE_BVEC(x) struct bio_vec x
+# define BVEC_ADDR(x) &x
+# define BVEC_FIELD(x, y) x.y
+
+#endif
+
 static void aio_read_done(struct sheep_aiocb *aiocb)
 {
        struct req_iterator iter;
-       struct bio_vec *bvec;
+       DEFINE_BVEC(bvec);
        struct request *req = aiocb->request;
        int len = 0;
 
@@ -347,13 +361,13 @@ static void aio_read_done(struct sheep_aiocb *aiocb)
 
        rq_for_each_segment(bvec, req, iter) {
                unsigned long flags;
-               void *addr = bvec_kmap_irq(bvec, &flags);
+               void *addr = bvec_kmap_irq(BVEC_ADDR(bvec), &flags);
 
-               memcpy(addr, aiocb->buf + len, bvec->bv_len);
-               flush_dcache_page(bvec->bv_page);
+               memcpy(addr, aiocb->buf + len, BVEC_FIELD(bvec, bv_len));
+               flush_dcache_page(BVEC_FIELD(bvec, bv_page));
                bvec_kunmap_irq(addr, &flags);
 
-               len += bvec->bv_len;
+               len += BVEC_FIELD(bvec, bv_len);
        }
 
        blk_end_request_all(aiocb->request, aiocb->ret);
@@ -365,7 +379,7 @@ struct sheep_aiocb *sheep_aiocb_setup(struct request *req)
        struct sheep_aiocb *aiocb = kmem_cache_alloc(sheep_aiocb_pool,
                                                     SBD_GFP_FLAGS);
        struct req_iterator iter;
-       struct bio_vec *bvec;
+       DEFINE_BVEC(bvec);
        int len = 0;
 
        if (!aiocb)
@@ -388,13 +402,14 @@ struct sheep_aiocb *sheep_aiocb_setup(struct request *req)
        case WRITE:
                rq_for_each_segment(bvec, req, iter) {
                        unsigned long flags;
-                       void *addr = bvec_kmap_irq(bvec, &flags);
+                       void *addr = bvec_kmap_irq(BVEC_ADDR(bvec), &flags);
 
-                       memcpy(aiocb->buf + len, addr, bvec->bv_len);
-                       flush_dcache_page(bvec->bv_page);
+                       memcpy(aiocb->buf + len, addr,
+                              BVEC_FIELD(bvec, bv_len));
+                       flush_dcache_page(BVEC_FIELD(bvec, bv_page));
                        bvec_kunmap_irq(addr, &flags);
 
-                       len += bvec->bv_len;
+                       len += BVEC_FIELD(bvec, bv_len);
                }
                aiocb->aio_done_func = aio_write_done;
                break;
-- 
1.8.1.2

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