[v3] virtiofs dax patches

[PATCH v3 17/26] DAX: virtiofsd: Perform an unmap on destroy

Dr. David Alan Gilbert (git) posted 26 patches 4 years, 9 months ago

Diff against v1 v2
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Maintainers: Stefan Hajnoczi <stefanha@redhat.com>, Kevin Wolf <kwolf@redhat.com>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>, Max Reitz <mreitz@redhat.com>, Raphael Norwitz <raphael.norwitz@nutanix.com>, Coiby Xu <Coiby.Xu@gmail.com>, "Michael S. Tsirkin" <mst@redhat.com>

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[PATCH v3 17/26] DAX: virtiofsd: Perform an unmap on destroy

Posted by Dr. David Alan Gilbert (git) 4 years, 9 months ago

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Force unmap all remaining dax cache entries on a destroy.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 tools/virtiofsd/passthrough_ll.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
index ed5b6c9e2d..600e102839 100644
--- a/tools/virtiofsd/passthrough_ll.c
+++ b/tools/virtiofsd/passthrough_ll.c
@@ -3129,6 +3129,20 @@ static void lo_destroy(void *userdata, struct fuse_session *se)
 {
     struct lo_data *lo = (struct lo_data *)userdata;
 
+    if (fuse_lowlevel_is_virtio(se)) {
+        VhostUserFSSlaveMsg *msg = g_malloc0(sizeof(VhostUserFSSlaveMsg) +
+                                             sizeof(VhostUserFSSlaveMsgEntry));
+
+        msg->count = 0;
+        msg->entries[0].len = ~(uint64_t)0; /* Special: means 'all' */
+        msg->entries[0].c_offset = 0;
+        if (fuse_virtio_unmap(se, msg)) {
+            fuse_log(FUSE_LOG_ERR, "%s: unmap during destroy failed\n",
+                     __func__);
+        }
+        g_free(msg);
+    }
+
     pthread_mutex_lock(&lo->mutex);
     while (true) {
         GHashTableIter iter;
-- 
2.31.1