[Qemu-devel] [PATCH v2 05/20] block: handle ENOTSUP from discard in generic code

[Paolo Bonzini <pbonzini@redhat.com>]

Similar to write_zeroes, let the generic code receive a ENOTSUP for
discard operations.  Since bdrv_discard has advisory semantics,
we can just swallow the error.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 block.c           |  2 +-
 block/raw-posix.c | 12 ++++++------
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/block.c b/block.c
index f5428f4..4897649 100644
--- a/block.c
+++ b/block.c
@@ -4357,7 +4357,7 @@ int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num,
                 ret = co.ret;
             }
         }
-        if (ret) {
+        if (ret && ret != -ENOTSUP) {
             return ret;
         }
 
diff --git a/block/raw-posix.c b/block/raw-posix.c
index ace5d96..f719b69 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -324,10 +324,10 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
     }
 #endif
 
-    s->has_discard = 1;
+    s->has_discard = true;
 #ifdef CONFIG_XFS
     if (platform_test_xfs_fd(s->fd)) {
-        s->is_xfs = 1;
+        s->is_xfs = true;
     }
 #endif
 
@@ -699,8 +699,8 @@ static ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb)
     int ret = -EOPNOTSUPP;
     BDRVRawState *s = aiocb->bs->opaque;
 
-    if (s->has_discard == 0) {
-        return 0;
+    if (!s->has_discard) {
+        return -ENOTSUP;
     }
 
     if (aiocb->aio_type & QEMU_AIO_BLKDEV) {
@@ -735,8 +735,8 @@ static ssize_t handle_aiocb_discard(RawPosixAIOData *aiocb)
 
     if (ret == -ENODEV || ret == -ENOSYS || ret == -EOPNOTSUPP ||
         ret == -ENOTTY) {
-        s->has_discard = 0;
-        ret = 0;
+        s->has_discard = false;
+        ret = -ENOTSUP;
     }
     return ret;
 }
-- 
1.8.4.2