smbd: Fix bug 9544, part 2

Plug in async pwrite

Reviewed by: Jeremy Allison <jra@samba.org>

Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Tue Jan 15 00:55:51 CET 2013 on sn-devel-104

1 files changed, 80 insertions, 0 deletions

diff --git a/source3/modules/vfs_commit.c b/source3/modules/vfs_commit.c
index c9c0a056a5..a6bc2a4a65 100644
--- a/source3/modules/vfs_commit.c
+++ b/source3/modules/vfs_commit.c
@@ -19,6 +19,7 @@
 #include "includes.h"
 #include "system/filesys.h"
 #include "smbd/smbd.h"
+#include "lib/util/tevent_unix.h"
 
 /* Commit data module.
  *
@@ -275,6 +276,83 @@ static ssize_t commit_pwrite(
         return ret;
 }
 
+struct commit_pwrite_state {
+	struct vfs_handle_struct *handle;
+	struct files_struct *fsp;
+	ssize_t ret;
+	int err;
+};
+
+static void commit_pwrite_written(struct tevent_req *subreq);
+
+static struct tevent_req *commit_pwrite_send(struct vfs_handle_struct *handle,
+					     TALLOC_CTX *mem_ctx,
+					     struct tevent_context *ev,
+					     struct files_struct *fsp,
+					     const void *data,
+					     size_t n, off_t offset)
+{
+	struct tevent_req *req, *subreq;
+	struct commit_pwrite_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct commit_pwrite_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->handle = handle;
+	state->fsp = fsp;
+
+	subreq = SMB_VFS_NEXT_PWRITE_SEND(state, ev, handle, fsp, data,
+					  n, offset);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, commit_pwrite_written, req);
+	return req;
+}
+
+static void commit_pwrite_written(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct commit_pwrite_state *state = tevent_req_data(
+		req, struct commit_pwrite_state);
+	int commit_ret;
+
+	state->ret = SMB_VFS_PWRITE_RECV(subreq, &state->err);
+	TALLOC_FREE(subreq);
+
+	if (state->ret <= 0) {
+		tevent_req_done(req);
+		return;
+	}
+
+	/*
+	 * Ok, this is a sync fake. We should make the sync async as well, but
+	 * I'm too lazy for that right now -- vl
+	 */
+	commit_ret = commit(state->handle, state->fsp, state->fsp->fh->pos,
+			    state->ret);
+
+	if (commit_ret == -1) {
+		state->ret = -1;
+	}
+
+	tevent_req_done(req);
+}
+
+static ssize_t commit_pwrite_recv(struct tevent_req *req, int *err)
+{
+	struct commit_pwrite_state *state =
+		tevent_req_data(req, struct commit_pwrite_state);
+
+	if (tevent_req_is_unix_error(req, err)) {
+		return -1;
+	}
+	*err = state->err;
+	return state->ret;
+}
+
 static int commit_close(
         vfs_handle_struct * handle,
         files_struct *      fsp)
@@ -309,6 +387,8 @@ static struct vfs_fn_pointers vfs_commit_fns = {
         .close_fn = commit_close,
         .write_fn = commit_write,
         .pwrite_fn = commit_pwrite,
+        .pwrite_send_fn = commit_pwrite_send,
+        .pwrite_recv_fn = commit_pwrite_recv,
         .connect_fn = commit_connect,
         .ftruncate_fn = commit_ftruncate
 };