net/9p: Implement attrwalk 9p call

[net-next-2.6.git] / net / 9p / client.c

diff --git a/net/9p/client.c b/net/9p/client.c
index c458e042d38436484645186f60511f27bc449796..ec80ee71d45346a012c25c70db90bb03eb982c43 100644 (file)
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1622,6 +1622,56 @@ error:
 }
 EXPORT_SYMBOL(p9_client_rename);
 
+/*
+ * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
+ */
+struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
+                               const char *attr_name, u64 *attr_size)
+{
+       int err;
+       struct p9_req_t *req;
+       struct p9_client *clnt;
+       struct p9_fid *attr_fid;
+
+       err = 0;
+       clnt = file_fid->clnt;
+       attr_fid = p9_fid_create(clnt);
+       if (IS_ERR(attr_fid)) {
+               err = PTR_ERR(attr_fid);
+               attr_fid = NULL;
+               goto error;
+       }
+       P9_DPRINTK(P9_DEBUG_9P,
+               ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
+               file_fid->fid, attr_fid->fid, attr_name);
+
+       req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
+                       file_fid->fid, attr_fid->fid, attr_name);
+       if (IS_ERR(req)) {
+               err = PTR_ERR(req);
+               goto error;
+       }
+       err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
+       if (err) {
+               p9pdu_dump(1, req->rc);
+               p9_free_req(clnt, req);
+               goto clunk_fid;
+       }
+       p9_free_req(clnt, req);
+       P9_DPRINTK(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",
+               attr_fid->fid, *attr_size);
+       return attr_fid;
+clunk_fid:
+       p9_client_clunk(attr_fid);
+       attr_fid = NULL;
+error:
+       if (attr_fid && (attr_fid != file_fid))
+               p9_fid_destroy(attr_fid);
+
+       return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
+
 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
 {
        int err, rsize, total;