From 23b92512d7f11b3a38cf24a5c2fe7848f1e550e8 Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <mlevitsk@redhat.com>
Date: Sun, 31 May 2020 16:40:34 +0100
Subject: [PATCH 6/7] block.c: adding bdrv_co_delete_file
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RH-Author: Maxim Levitsky <mlevitsk@redhat.com>
Message-id: <20200531164035.34188-3-mlevitsk@redhat.com>
Patchwork-id: 97058
O-Subject: [RHEL-AV-8.2.1 qemu-kvm PATCH 2/3] block.c: adding bdrv_co_delete_file
Bugzilla: 1827630
RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
RH-Acked-by: John Snow <jsnow@redhat.com>
RH-Acked-by: Eric Blake <eblake@redhat.com>

From: Daniel Henrique Barboza <danielhb413@gmail.com>

Using the new 'bdrv_co_delete_file' interface, a pure co_routine function
'bdrv_co_delete_file' inside block.c can can be used in a way similar of
the existing bdrv_create_file to to clean up a created file.

We're creating a pure co_routine because the only caller of
'bdrv_co_delete_file' will be already in co_routine context, thus there
is no need to add all the machinery to check for qemu_in_coroutine() and
create a separated co_routine to do the job.

Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20200130213907.2830642-3-danielhb413@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit e1d7f8bb1ec0c6911dcea81641ce6139dbded02d)
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 block.c               | 26 ++++++++++++++++++++++++++
 include/block/block.h |  1 +
 2 files changed, 27 insertions(+)

diff --git a/block.c b/block.c
index ba3b40d7..d6a05da 100644
--- a/block.c
+++ b/block.c
@@ -672,6 +672,32 @@ int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp)
     return bdrv_create(drv, filename, opts, errp);
 }
 
+int coroutine_fn bdrv_co_delete_file(BlockDriverState *bs, Error **errp)
+{
+    Error *local_err = NULL;
+    int ret;
+
+    assert(bs != NULL);
+
+    if (!bs->drv) {
+        error_setg(errp, "Block node '%s' is not opened", bs->filename);
+        return -ENOMEDIUM;
+    }
+
+    if (!bs->drv->bdrv_co_delete_file) {
+        error_setg(errp, "Driver '%s' does not support image deletion",
+                   bs->drv->format_name);
+        return -ENOTSUP;
+    }
+
+    ret = bs->drv->bdrv_co_delete_file(bs, &local_err);
+    if (ret < 0) {
+        error_propagate(errp, local_err);
+    }
+
+    return ret;
+}
+
 /**
  * Try to get @bs's logical and physical block size.
  * On success, store them in @bsz struct and return 0.
diff --git a/include/block/block.h b/include/block/block.h
index 92685d2..b2a3074 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -373,6 +373,7 @@ bool bdrv_is_backing_chain_frozen(BlockDriverState *bs, BlockDriverState *base,
 int bdrv_freeze_backing_chain(BlockDriverState *bs, BlockDriverState *base,
                               Error **errp);
 void bdrv_unfreeze_backing_chain(BlockDriverState *bs, BlockDriverState *base);
+int coroutine_fn bdrv_co_delete_file(BlockDriverState *bs, Error **errp);
 
 
 typedef struct BdrvCheckResult {
-- 
1.8.3.1