block: convert bdrv_invalidate_cache callback to coroutine_fn

QED's bdrv_invalidate_cache implementation would like to reuse functions
that acquire/release the metadata locks.  Call it from coroutine context
to simplify the logic.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1516279431-30424-6-git-send-email-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

5 files changed, 19 insertions, 19 deletions

diff --git a/block/iscsi.c b/block/iscsi.c
index 8bf0e87..a82170f 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -2177,8 +2177,8 @@ static int iscsi_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
     return 0;
 }
 
-static void iscsi_invalidate_cache(BlockDriverState *bs,
-                                   Error **errp)
+static void coroutine_fn iscsi_co_invalidate_cache(BlockDriverState *bs,
+                                                   Error **errp)
 {
     IscsiLun *iscsilun = bs->opaque;
     iscsi_allocmap_invalidate(iscsilun);
@@ -2209,7 +2209,7 @@ static BlockDriver bdrv_iscsi = {
     .create_opts            = &iscsi_create_opts,
     .bdrv_reopen_prepare    = iscsi_reopen_prepare,
     .bdrv_reopen_commit     = iscsi_reopen_commit,
-    .bdrv_invalidate_cache  = iscsi_invalidate_cache,
+    .bdrv_co_invalidate_cache = iscsi_co_invalidate_cache,
 
     .bdrv_getlength  = iscsi_getlength,
     .bdrv_get_info   = iscsi_get_info,
diff --git a/block/nfs.c b/block/nfs.c
index 1d82ff5..7433d25 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -876,8 +876,8 @@ static void nfs_refresh_filename(BlockDriverState *bs, QDict *options)
 }
 
 #ifdef LIBNFS_FEATURE_PAGECACHE
-static void nfs_invalidate_cache(BlockDriverState *bs,
-                                 Error **errp)
+static void coroutine_fn nfs_co_invalidate_cache(BlockDriverState *bs,
+                                                 Error **errp)
 {
     NFSClient *client = bs->opaque;
     nfs_pagecache_invalidate(client->context, client->fh);
@@ -910,7 +910,7 @@ static BlockDriver bdrv_nfs = {
     .bdrv_refresh_filename          = nfs_refresh_filename,
 
 #ifdef LIBNFS_FEATURE_PAGECACHE
-    .bdrv_invalidate_cache          = nfs_invalidate_cache,
+    .bdrv_co_invalidate_cache       = nfs_co_invalidate_cache,
 #endif
 };
 
diff --git a/block/qcow2.c b/block/qcow2.c
index 4ac1a45..ac8703f 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2142,7 +2142,8 @@ static void qcow2_close(BlockDriverState *bs)
     qcow2_free_snapshots(bs);
 }
 
-static void qcow2_invalidate_cache(BlockDriverState *bs, Error **errp)
+static void coroutine_fn qcow2_co_invalidate_cache(BlockDriverState *bs,
+                                                   Error **errp)
 {
     BDRVQcow2State *s = bs->opaque;
     int flags = s->flags;
@@ -2165,7 +2166,9 @@ static void qcow2_invalidate_cache(BlockDriverState *bs, Error **errp)
     options = qdict_clone_shallow(bs->options);
 
     flags &= ~BDRV_O_INACTIVE;
+    qemu_co_mutex_lock(&s->lock);
     ret = qcow2_do_open(bs, options, flags, &local_err);
+    qemu_co_mutex_unlock(&s->lock);
     QDECREF(options);
     if (local_err) {
         error_propagate(errp, local_err);
@@ -4406,7 +4409,7 @@ BlockDriver bdrv_qcow2 = {
     .bdrv_change_backing_file   = qcow2_change_backing_file,
 
     .bdrv_refresh_limits        = qcow2_refresh_limits,
-    .bdrv_invalidate_cache      = qcow2_invalidate_cache,
+    .bdrv_co_invalidate_cache   = qcow2_co_invalidate_cache,
     .bdrv_inactivate            = qcow2_inactivate,
 
     .create_opts         = &qcow2_create_opts,
diff --git a/block/qed.c b/block/qed.c
index 2996f14..5a5414b 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1521,7 +1521,8 @@ static int bdrv_qed_change_backing_file(BlockDriverState *bs,
     return ret;
 }
 
-static void bdrv_qed_invalidate_cache(BlockDriverState *bs, Error **errp)
+static void coroutine_fn bdrv_qed_co_invalidate_cache(BlockDriverState *bs,
+                                                      Error **errp)
 {
     BDRVQEDState *s = bs->opaque;
     Error *local_err = NULL;
@@ -1530,13 +1531,9 @@ static void bdrv_qed_invalidate_cache(BlockDriverState *bs, Error **errp)
     bdrv_qed_close(bs);
 
     bdrv_qed_init_state(bs);
-    if (qemu_in_coroutine()) {
-        qemu_co_mutex_lock(&s->table_lock);
-    }
+    qemu_co_mutex_lock(&s->table_lock);
     ret = bdrv_qed_do_open(bs, NULL, bs->open_flags, &local_err);
-    if (qemu_in_coroutine()) {
-        qemu_co_mutex_unlock(&s->table_lock);
-    }
+    qemu_co_mutex_unlock(&s->table_lock);
     if (local_err) {
         error_propagate(errp, local_err);
         error_prepend(errp, "Could not reopen qed layer: ");
@@ -1611,7 +1608,7 @@ static BlockDriver bdrv_qed = {
     .bdrv_get_info            = bdrv_qed_get_info,
     .bdrv_refresh_limits      = bdrv_qed_refresh_limits,
     .bdrv_change_backing_file = bdrv_qed_change_backing_file,
-    .bdrv_invalidate_cache    = bdrv_qed_invalidate_cache,
+    .bdrv_co_invalidate_cache = bdrv_qed_co_invalidate_cache,
     .bdrv_check               = bdrv_qed_check,
     .bdrv_detach_aio_context  = bdrv_qed_detach_aio_context,
     .bdrv_attach_aio_context  = bdrv_qed_attach_aio_context,
diff --git a/block/rbd.c b/block/rbd.c
index c7dd32e..c1275c1 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -1093,8 +1093,8 @@ static BlockAIOCB *qemu_rbd_aio_pdiscard(BlockDriverState *bs,
 #endif
 
 #ifdef LIBRBD_SUPPORTS_INVALIDATE
-static void qemu_rbd_invalidate_cache(BlockDriverState *bs,
-                                      Error **errp)
+static void coroutine_fn qemu_rbd_co_invalidate_cache(BlockDriverState *bs,
+                                                      Error **errp)
 {
     BDRVRBDState *s = bs->opaque;
     int r = rbd_invalidate_cache(s->image);
@@ -1160,7 +1160,7 @@ static BlockDriver bdrv_rbd = {
     .bdrv_snapshot_list     = qemu_rbd_snap_list,
     .bdrv_snapshot_goto     = qemu_rbd_snap_rollback,
 #ifdef LIBRBD_SUPPORTS_INVALIDATE
-    .bdrv_invalidate_cache  = qemu_rbd_invalidate_cache,
+    .bdrv_co_invalidate_cache = qemu_rbd_co_invalidate_cache,
 #endif
 };