r20624: added AIO read to pvfs backend

(This used to be commit d6e20d6d8c5c207e7f04b0d0523224437b209917)

1 files changed, 96 insertions, 0 deletions

diff --git a/source4/ntvfs/posix/pvfs_aio.c b/source4/ntvfs/posix/pvfs_aio.c
new file mode 100644
index 0000000000..262b856aa9
--- /dev/null
+++ b/source4/ntvfs/posix/pvfs_aio.c
@@ -0,0 +1,96 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   POSIX NTVFS backend - Linux AIO calls
+
+   Copyright (C) Andrew Tridgell 2006
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "vfs_posix.h"
+#include "lib/events/events.h"
+#include "system/aio.h"
+
+struct pvfs_aio_read_state {
+	struct ntvfs_request *req;
+	union smb_read *rd;
+	struct pvfs_file *f;
+	struct aio_event *ae;
+};
+
+/*
+  called when an aio read has finished
+*/
+static void pvfs_aio_handler(struct event_context *ev, struct aio_event *ae, 
+			     int ret, void *private)
+{
+	struct pvfs_aio_read_state *state = talloc_get_type(private, 
+							    struct pvfs_aio_read_state);
+	struct pvfs_file *f = state->f;
+	union smb_read *rd = state->rd;
+
+	if (ret < 0) {
+		/* errno is -ret on error */
+		state->req->async_states->status = pvfs_map_errno(f->pvfs, -ret);
+		state->req->async_states->send_fn(state->req);
+		return;
+	}
+
+	f->handle->position = f->handle->seek_offset = rd->readx.in.offset + ret;
+
+	rd->readx.out.nread = ret;
+	rd->readx.out.remaining = 0xFFFF;
+	rd->readx.out.compaction_mode = 0; 
+
+	talloc_steal(ev, state->ae);
+
+	state->req->async_states->status = NT_STATUS_OK;
+	state->req->async_states->send_fn(state->req);
+}
+
+
+/*
+  read from a file
+*/
+NTSTATUS pvfs_aio_pread(struct ntvfs_request *req, union smb_read *rd,
+			struct pvfs_file *f, uint32_t maxcnt)
+{
+	struct iocb iocb;
+	struct pvfs_aio_read_state *state;
+
+	state = talloc(req, struct pvfs_aio_read_state);
+	NT_STATUS_HAVE_NO_MEMORY(state);
+
+        io_prep_pread(&iocb, f->handle->fd, rd->readx.out.data,
+		      maxcnt, rd->readx.in.offset);
+	state->ae = event_add_aio(req->ctx->event_ctx, req->ctx->event_ctx, &iocb, 
+				  pvfs_aio_handler, state);
+	if (state->ae == NULL) {
+		DEBUG(0,("Failed event_add_aio\n"));
+		talloc_free(state);
+		return NT_STATUS_NOT_IMPLEMENTED;
+	}
+
+	state->req  = req;
+	state->rd   = rd;
+	state->f    = f;
+
+	req->async_states->state |= NTVFS_ASYNC_STATE_ASYNC;
+
+	return NT_STATUS_OK;
+}
+