[PATCH v2 16/18] block: Add blk_co_truncate()

[Alberto Faria]

Also convert blk_truncate() into a generated_co_wrapper.

Signed-off-by: Alberto Faria <afaria@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
---
 block/block-backend.c             |  7 ++++---
 include/sysemu/block-backend-io.h |  8 ++++++--
 tests/unit/test-block-iothread.c  | 14 ++++++++++++++
 3 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index 7bad42259e..52be1d9116 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -2303,8 +2303,9 @@ int coroutine_fn blk_co_pwrite_compressed(BlockBackend 
*blk, int64_t offset,
                                BDRV_REQ_WRITE_COMPRESSED);
 }
 
-int blk_truncate(BlockBackend *blk, int64_t offset, bool exact,
-                 PreallocMode prealloc, BdrvRequestFlags flags, Error **errp)
+int coroutine_fn blk_co_truncate(BlockBackend *blk, int64_t offset, bool exact,
+                                 PreallocMode prealloc, BdrvRequestFlags flags,
+                                 Error **errp)
 {
     IO_OR_GS_CODE();
     if (!blk_is_available(blk)) {
@@ -2312,7 +2313,7 @@ int blk_truncate(BlockBackend *blk, int64_t offset, bool 
exact,
         return -ENOMEDIUM;
     }
 
-    return bdrv_truncate(blk->root, offset, exact, prealloc, flags, errp);
+    return bdrv_co_truncate(blk->root, offset, exact, prealloc, flags, errp);
 }
 
 int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
diff --git a/include/sysemu/block-backend-io.h 
b/include/sysemu/block-backend-io.h
index bb1ae25863..004493ec36 100644
--- a/include/sysemu/block-backend-io.h
+++ b/include/sysemu/block-backend-io.h
@@ -183,7 +183,11 @@ int generated_co_wrapper blk_pwrite_zeroes(BlockBackend 
*blk, int64_t offset,
                                            BdrvRequestFlags flags);
 int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
                                       int64_t bytes, BdrvRequestFlags flags);
-int blk_truncate(BlockBackend *blk, int64_t offset, bool exact,
-                 PreallocMode prealloc, BdrvRequestFlags flags, Error **errp);
+int generated_co_wrapper blk_truncate(BlockBackend *blk, int64_t offset,
+                                      bool exact, PreallocMode prealloc,
+                                      BdrvRequestFlags flags, Error **errp);
+int coroutine_fn blk_co_truncate(BlockBackend *blk, int64_t offset, bool exact,
+                                 PreallocMode prealloc, BdrvRequestFlags flags,
+                                 Error **errp);
 
 #endif /* BLOCK_BACKEND_IO_H */
diff --git a/tests/unit/test-block-iothread.c b/tests/unit/test-block-iothread.c
index bb9230a4b4..8b55eccc89 100644
--- a/tests/unit/test-block-iothread.c
+++ b/tests/unit/test-block-iothread.c
@@ -298,6 +298,19 @@ static void test_sync_op_truncate(BdrvChild *c)
     c->bs->open_flags |= BDRV_O_RDWR;
 }
 
+static void test_sync_op_blk_truncate(BlockBackend *blk)
+{
+    int ret;
+
+    /* Normal success path */
+    ret = blk_truncate(blk, 65536, false, PREALLOC_MODE_OFF, 0, NULL);
+    g_assert_cmpint(ret, ==, 0);
+
+    /* Early error: Negative offset */
+    ret = blk_truncate(blk, -2, false, PREALLOC_MODE_OFF, 0, NULL);
+    g_assert_cmpint(ret, ==, -EINVAL);
+}
+
 static void test_sync_op_block_status(BdrvChild *c)
 {
     int ret;
@@ -425,6 +438,7 @@ const SyncOpTest sync_op_tests[] = {
     }, {
         .name   = "/sync-op/truncate",
         .fn     = test_sync_op_truncate,
+        .blkfn  = test_sync_op_blk_truncate,
     }, {
         .name   = "/sync-op/block_status",
         .fn     = test_sync_op_block_status,
-- 
2.36.1