[virtio-9p] Define and implement TSYMLINK for 9P2000.L

This patch implements creating a symlink for TSYMLINK request
and responds with RSYMLINK. In the case of error, we return RERROR.

SYNOPSIS

    size[4] Tsymlink tag[2] fid[4] name[s] symtgt[s] gid[4]

    size[4] Rsymlink tag[2] qid[13]

    DESCRIPTION

    Create a symbolic link named 'name' pointing to 'symtgt'.
    gid represents the effective group id of the caller.
    The  permissions of a symbolic link are irrelevant hence it is omitted
    from the protocol.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/hw/virtio-9p.h b/hw/virtio-9p.h
index d48776f..3671863 100644
--- a/hw/virtio-9p.h
+++ b/hw/virtio-9p.h
@@ -15,6 +15,8 @@
 enum {
     P9_TSTATFS = 8,
     P9_RSTATFS,
+    P9_TSYMLINK = 16,
+    P9_RSYMLINK,
     P9_TGETATTR = 24,
     P9_RGETATTR,
     P9_TSETATTR = 26,
@@ -294,6 +296,18 @@ typedef struct V9fsWstatState
     V9fsString nname;
 } V9fsWstatState;
 
+typedef struct V9fsSymlinkState
+{
+    V9fsPDU *pdu;
+    size_t offset;
+    V9fsString name;
+    V9fsString symname;
+    V9fsString fullname;
+    V9fsFidState *dfidp;
+    V9fsQID qid;
+    struct stat stbuf;
+} V9fsSymlinkState;
+
 typedef struct V9fsIattr
 {
     int32_t valid;