block: move trace probes into bdrv_co_preadv|pwritev

There are trace probes in bdrv_co_readv|writev, however, the
block drivers are being gradually moved over to using the
bdrv_co_preadv|pwritev functions instead. As a result some
block drivers miss the current probes. Move the probes
into bdrv_co_preadv|pwritev instead, so that they are triggered
by more (all?) I/O code paths.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 20170804105036.11879-1-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

block/io.c

@@ -1135,6 +1135,8 @@ int coroutine_fn bdrv_co_preadv(BdrvChild *child,
     bool use_local_qiov = false;
     int ret;
 
+    trace_bdrv_co_preadv(child->bs, offset, bytes, flags);
+
     if (!drv) {
         return -ENOMEDIUM;
     }
@@ -1207,8 +1209,6 @@ static int coroutine_fn bdrv_co_do_readv(BdrvChild *child,
 int coroutine_fn bdrv_co_readv(BdrvChild *child, int64_t sector_num,
                                int nb_sectors, QEMUIOVector *qiov)
 {
-    trace_bdrv_co_readv(child->bs, sector_num, nb_sectors);
-
     return bdrv_co_do_readv(child, sector_num, nb_sectors, qiov, 0);
 }
 
@@ -1526,6 +1526,8 @@ int coroutine_fn bdrv_co_pwritev(BdrvChild *child,
     bool use_local_qiov = false;
     int ret;
 
+    trace_bdrv_co_pwritev(child->bs, offset, bytes, flags);
+
     if (!bs->drv) {
         return -ENOMEDIUM;
     }
@@ -1660,8 +1662,6 @@ static int coroutine_fn bdrv_co_do_writev(BdrvChild *child,
 int coroutine_fn bdrv_co_writev(BdrvChild *child, int64_t sector_num,
     int nb_sectors, QEMUIOVector *qiov)
 {
-    trace_bdrv_co_writev(child->bs, sector_num, nb_sectors);
-
     return bdrv_co_do_writev(child, sector_num, nb_sectors, qiov, 0);
 }
 

block/trace-events

@@ -9,8 +9,8 @@ blk_co_preadv(void *blk, void *bs, int64_t offset, unsigned int bytes, int flags
 blk_co_pwritev(void *blk, void *bs, int64_t offset, unsigned int bytes, int flags) "blk %p bs %p offset %"PRId64" bytes %u flags 0x%x"
 
 # block/io.c
-bdrv_co_readv(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
-bdrv_co_writev(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
+bdrv_co_preadv(void *bs, int64_t offset, int64_t nbytes, unsigned int flags) "bs %p offset %"PRId64" nbytes %"PRId64" flags 0x%x"
+bdrv_co_pwritev(void *bs, int64_t offset, int64_t nbytes, unsigned int flags) "bs %p offset %"PRId64" nbytes %"PRId64" flags 0x%x"
 bdrv_co_pwrite_zeroes(void *bs, int64_t offset, int count, int flags) "bs %p offset %"PRId64" count %d flags 0x%x"
 bdrv_co_do_copy_on_readv(void *bs, int64_t offset, unsigned int bytes, int64_t cluster_offset, unsigned int cluster_bytes) "bs %p offset %"PRId64" bytes %u cluster_offset %"PRId64" cluster_bytes %u"