[PATCH v2 01/20] qcow2: Don't call bdrv_getlength() in coroutine_fns

[Kevin Wolf]

There is a bdrv_co_getlength() now, which should be used in coroutine
context.

This requires adding GRAPH_RDLOCK to some functions so that this still
compiles with TSA because bdrv_co_getlength() is GRAPH_RDLOCK.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block/qcow2.h          |  4 +++-
 block/qcow2-refcount.c |  2 +-
 block/qcow2.c          | 19 +++++++++----------
 3 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/block/qcow2.h b/block/qcow2.h
index c75decc38a..4f67eb912a 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -895,7 +895,9 @@ int qcow2_change_refcount_order(BlockDriverState *bs, int 
refcount_order,
                                 void *cb_opaque, Error **errp);
 int coroutine_fn GRAPH_RDLOCK qcow2_shrink_reftable(BlockDriverState *bs);
 int64_t coroutine_fn qcow2_get_last_cluster(BlockDriverState *bs, int64_t 
size);
-int coroutine_fn qcow2_detect_metadata_preallocation(BlockDriverState *bs);
+
+int coroutine_fn GRAPH_RDLOCK
+qcow2_detect_metadata_preallocation(BlockDriverState *bs);
 
 /* qcow2-cluster.c functions */
 int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index b2a81ff707..4cf91bd955 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -3715,7 +3715,7 @@ int coroutine_fn 
qcow2_detect_metadata_preallocation(BlockDriverState *bs)
 
     qemu_co_mutex_assert_locked(&s->lock);
 
-    file_length = bdrv_getlength(bs->file->bs);
+    file_length = bdrv_co_getlength(bs->file->bs);
     if (file_length < 0) {
         return file_length;
     }
diff --git a/block/qcow2.c b/block/qcow2.c
index fe5def438e..94cf59af8b 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2089,11 +2089,10 @@ static void qcow2_join_options(QDict *options, QDict 
*old_options)
     }
 }
 
-static int coroutine_fn qcow2_co_block_status(BlockDriverState *bs,
-                                              bool want_zero,
-                                              int64_t offset, int64_t count,
-                                              int64_t *pnum, int64_t *map,
-                                              BlockDriverState **file)
+static int coroutine_fn GRAPH_RDLOCK
+qcow2_co_block_status(BlockDriverState *bs, bool want_zero, int64_t offset,
+                      int64_t count, int64_t *pnum, int64_t *map,
+                      BlockDriverState **file)
 {
     BDRVQcow2State *s = bs->opaque;
     uint64_t host_offset;
@@ -3235,7 +3234,7 @@ preallocate_co(BlockDriverState *bs, uint64_t offset, 
uint64_t new_length,
      * all of the allocated clusters (otherwise we get failing reads after
      * EOF). Extend the image to the last allocated sector.
      */
-    file_length = bdrv_getlength(s->data_file->bs);
+    file_length = bdrv_co_getlength(s->data_file->bs);
     if (file_length < 0) {
         error_setg_errno(errp, -file_length, "Could not get file size");
         ret = file_length;
@@ -4098,7 +4097,7 @@ qcow2_co_copy_range_from(BlockDriverState *bs,
         case QCOW2_SUBCLUSTER_UNALLOCATED_PLAIN:
         case QCOW2_SUBCLUSTER_UNALLOCATED_ALLOC:
             if (bs->backing && bs->backing->bs) {
-                int64_t backing_length = bdrv_getlength(bs->backing->bs);
+                int64_t backing_length = bdrv_co_getlength(bs->backing->bs);
                 if (src_offset >= backing_length) {
                     cur_write_flags |= BDRV_REQ_ZERO_WRITE;
                 } else {
@@ -4293,7 +4292,7 @@ qcow2_co_truncate(BlockDriverState *bs, int64_t offset, 
bool exact,
             goto fail;
         }
 
-        old_file_size = bdrv_getlength(bs->file->bs);
+        old_file_size = bdrv_co_getlength(bs->file->bs);
         if (old_file_size < 0) {
             error_setg_errno(errp, -old_file_size,
                              "Failed to inquire current file length");
@@ -4386,7 +4385,7 @@ qcow2_co_truncate(BlockDriverState *bs, int64_t offset, 
bool exact,
             break;
         }
 
-        old_file_size = bdrv_getlength(bs->file->bs);
+        old_file_size = bdrv_co_getlength(bs->file->bs);
         if (old_file_size < 0) {
             error_setg_errno(errp, -old_file_size,
                              "Failed to inquire current file length");
@@ -4694,7 +4693,7 @@ qcow2_co_pwritev_compressed_part(BlockDriverState *bs,
          * align end of file to a sector boundary to ease reading with
          * sector based I/Os
          */
-        int64_t len = bdrv_getlength(bs->file->bs);
+        int64_t len = bdrv_co_getlength(bs->file->bs);
         if (len < 0) {
             return len;
         }
-- 
2.40.1