[Qemu-devel] [PATCH -V3 29/32] virtio-9p: Decouple share_path details from virtio-9p-dev

["Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>]

From: Gautham R Shenoy <ego@in.ibm.com>

Currently the share_path is an attribute of the virtio-9p device.

This patch makes fsdev object as an attribute of virtio-9p device by decoupling
the latter's association with share_path.

This abstraction would be useful in the future when we want to specify certain
file-system specific operations/flags as a part of the command line.

So, for now, the command line is going to look something like
#qemu -fsdev namefs,id=foo,path="path/to/share" \
      -device virtio-9p-pci,fsdev=foo,mount_tag=mount_tag \
      .
      .

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 hw/9p.h              |    2 +-
 hw/virtio-9p-local.c |    5 -----
 hw/virtio-9p.c       |   29 +++++++++++++++++++++--------
 hw/virtio-pci.c      |    2 +-
 4 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/hw/9p.h b/hw/9p.h
index f0ff45b..5fdd770 100644
--- a/hw/9p.h
+++ b/hw/9p.h
@@ -18,9 +18,9 @@
 
 typedef struct V9fsConf
 {
-    char *share_path;
     /* tag name for the device */
     char *tag;
+    char *fsdev_id;
 } V9fsConf;
 
 #endif
diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
index aae82d2..a0cbcc0 100644
--- a/hw/virtio-9p-local.c
+++ b/hw/virtio-9p-local.c
@@ -284,8 +284,3 @@ FileOperations local_ops = {
     .remove = local_remove,
     .fsync = local_fsync,
 };
-
-FileOperations *virtio_9p_init_local(const char *path)
-{
-    return &local_ops;
-}
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index d03693d..5ccaeac 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -15,6 +15,7 @@
 #include "pc.h"
 #include "qemu_socket.h"
 #include "virtio-9p.h"
+#include "fsdev/qemu-fsdev.h"
 #include <assert.h>
 
 int dotu = 1;
@@ -2214,6 +2215,7 @@ VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
     V9fsState *s;
     int i, len;
     struct stat stat;
+    FsTypeEntry *fse;
 
 
     s = (V9fsState *)virtio_common_init("virtio-9p",
@@ -2230,21 +2232,32 @@ VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
 
     s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output);
 
-    if (!conf->share_path || !conf->tag) {
+    fse = get_fsdev_fsentry(conf->fsdev_id);
+
+    if (!fse) {
+        /* We don't have a fsdev identified by fsdev_id */
+        fprintf(stderr, "Virtio-9p device couldn't find fsdev "
+                 "with the id %s\n", conf->fsdev_id);
+        exit(1);
+    }
+
+    if (!fse->path || !conf->tag) {
 	    /* we haven't specified a mount_tag */
-	    fprintf(stderr, "Virtio-9p devices need share_path "
-		    "and mount_tag arguments\n");
+	    fprintf(stderr, "fsdev with id %s needs path "
+		    "and Virtio-9p device needs "
+		     "mount_tag arguments\n", conf->fsdev_id);
 	    exit(1);
     }
-    if (lstat(conf->share_path, &stat)) {
-	    fprintf(stderr, "share path %s does not exist\n", conf->share_path);
+    if (lstat(fse->path, &stat)) {
+	    fprintf(stderr, "share path %s does not exist\n", fse->path);
 	    exit(1);
     } else if (!S_ISDIR(stat.st_mode)) {
-	    fprintf(stderr, "share path %s is not a directory \n", conf->share_path);
+	    fprintf(stderr, "share path %s is not a directory \n",
+                fse->path);
 	    exit(1);
     }
 
-    s->ctx.fs_root = qemu_strdup(conf->share_path);
+    s->ctx.fs_root = qemu_strdup(fse->path);
     len = strlen(conf->tag);
     if (len > MAX_TAG_LEN)
 	    len = MAX_TAG_LEN;
@@ -2254,7 +2267,7 @@ VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
     s->tag_len = len;
     s->ctx.uid = -1;
 
-    s->ops = virtio_9p_init_local(conf->share_path);
+    s->ops = fse->ops;
     s->vdev.get_features = virtio_9p_get_features;
     s->config_size = sizeof(struct virtio_9p_config) +
 			s->tag_len;
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 73e7df7..6f26b88 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -626,8 +626,8 @@ static PCIDeviceInfo virtio_info[] = {
         .init      = virtio_9p_init_pci,
         .qdev.props = (Property[]) {
             DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
-            DEFINE_PROP_STRING("share_path", VirtIOPCIProxy, fsconf.share_path),
             DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag),
+            DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id),
             DEFINE_PROP_END_OF_LIST(),
         },
     },{
-- 
1.7.0.2.323.g0d092