[Qemu-devel] [V11 08/15] virtio-9p: Removing file or directory in chroot environment

["M. Mohan Kumar" <mohan@in.ibm.com>]

From: "M. Mohan Kumar" <mohan@in.ibm.com>

Support for removing file or directory in chroot environment. Add
interfaces to remove file/directory in chroot worker and qemu side.

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
---
 hw/9pfs/virtio-9p-chroot-worker.c |   18 ++++++++++++++++++
 hw/9pfs/virtio-9p-chroot.h        |    1 +
 hw/9pfs/virtio-9p-local.c         |    4 ++++
 3 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/hw/9pfs/virtio-9p-chroot-worker.c b/hw/9pfs/virtio-9p-chroot-worker.c
index 10f290d..f269c7b 100644
--- a/hw/9pfs/virtio-9p-chroot-worker.c
+++ b/hw/9pfs/virtio-9p-chroot-worker.c
@@ -169,6 +169,21 @@ unset_uid:
     return retval;
 }
 
+/*
+ * Remove a file object
+ * Returns 0 on success and -errno on failure
+ */
+static int chroot_do_remove(V9fsFileObjectRequest *request)
+{
+    int retval;
+
+    retval = remove(request->path.path);
+    if (retval < 0) {
+        return -errno;
+    }
+    return 0;
+}
+
 static void chroot_daemonize(int chroot_sock)
 {
     sigset_t sigset;
@@ -272,6 +287,9 @@ int v9fs_chroot(FsContext *fs_ctx)
         case T_MKNOD:
             retval = chroot_do_create_special(&request);
             break;
+        case T_REMOVE:
+            retval = chroot_do_remove(&request);
+            break;
         default:
             retval = -1;
             break;
diff --git a/hw/9pfs/virtio-9p-chroot.h b/hw/9pfs/virtio-9p-chroot.h
index 9075361..9d69739 100644
--- a/hw/9pfs/virtio-9p-chroot.h
+++ b/hw/9pfs/virtio-9p-chroot.h
@@ -9,6 +9,7 @@
 #define T_MKNOD     4
 #define T_SYMLINK   5
 #define T_LINK      6
+#define T_REMOVE    7
 
 #define V9FS_FD_VALID INT_MAX
 
diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
index a1eff5f..f2d66e1 100644
--- a/hw/9pfs/virtio-9p-local.c
+++ b/hw/9pfs/virtio-9p-local.c
@@ -617,6 +617,10 @@ static int local_utimensat(FsContext *s, V9fsPath *fs_path,
 static int local_remove(FsContext *ctx, const char *path)
 {
     char buffer[PATH_MAX];
+
+    if (ctx->fs_sm == SM_PASSTHROUGH) {
+        return passthrough_request(ctx, NULL, path, 0, NULL, T_REMOVE);
+    }
     return remove(rpath(ctx, path, buffer));
 }
 
-- 
1.7.5.4