diff mbox

[for-2.5,4/4] block/mirror: replace IOV_MAX with blk_get_max_iov()

Message ID 1436369462-24252-5-git-send-email-stefanha@redhat.com
State New
Headers show

Commit Message

Stefan Hajnoczi July 8, 2015, 3:31 p.m. UTC 
Use blk_get_max_iov() instead of hardcoding IOV_MAX, which may not apply
to all BlockDrivers.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/mirror.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
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Patch

diff --git a/block/mirror.c b/block/mirror.c
index 985ad00..0f4445c 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -160,11 +160,13 @@  static void mirror_read_complete(void *opaque, int ret)
 static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
 {
     BlockDriverState *source = s->common.bs;
-    int nb_sectors, sectors_per_chunk, nb_chunks;
+    int nb_sectors, sectors_per_chunk, nb_chunks, max_iov;
     int64_t end, sector_num, next_chunk, next_sector, hbitmap_next_sector;
     uint64_t delay_ns = 0;
     MirrorOp *op;
 
+    max_iov = MIN(source->bl.max_iov, s->target->bl.max_iov);
+
     s->sector_num = hbitmap_iter_next(&s->hbi);
     if (s->sector_num < 0) {
         bdrv_dirty_iter_init(s->dirty_bitmap, &s->hbi);
@@ -241,7 +243,7 @@  static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
             trace_mirror_break_buf_busy(s, nb_chunks, s->in_flight);
             break;
         }
-        if (IOV_MAX < nb_chunks + added_chunks) {
+        if (max_iov < nb_chunks + added_chunks) {
             trace_mirror_break_iov_max(s, nb_chunks, added_chunks);
             break;
         }