1 files changed, 111 insertions, 0 deletions
diff --git a/source4/ntvfs/posix/pvfs_read.c b/source4/ntvfs/posix/pvfs_read.c
new file mode 100644
index 0000000000..8e1a59473f
--- /dev/null
+++ b/source4/ntvfs/posix/pvfs_read.c
@@ -0,0 +1,111 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   POSIX NTVFS backend - read
+
+   Copyright (C) Andrew Tridgell 2004
+
+   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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "vfs_posix.h"
+#include "lib/events/events.h"
+
+/*
+  read from a file
+*/
+NTSTATUS pvfs_read(struct ntvfs_module_context *ntvfs,
+		   struct ntvfs_request *req, union smb_read *rd)
+{
+	struct pvfs_state *pvfs = ntvfs->private_data;
+	ssize_t ret;
+	struct pvfs_file *f;
+	NTSTATUS status;
+	uint32_t maxcnt;
+	uint32_t mask;
+
+	if (rd->generic.level != RAW_READ_READX) {
+		return ntvfs_map_read(ntvfs, req, rd);
+	}
+
+	f = pvfs_find_fd(pvfs, req, rd->readx.in.file.ntvfs);
+	if (!f) {
+		return NT_STATUS_INVALID_HANDLE;
+	}
+
+	if (f->handle->fd == -1) {
+		return NT_STATUS_INVALID_DEVICE_REQUEST;
+	}
+
+	mask = SEC_FILE_READ_DATA;
+	if (rd->readx.in.read_for_execute) {
+		mask |= SEC_FILE_EXECUTE;
+	}
+	if (!(f->access_mask & mask)) {
+		return NT_STATUS_ACCESS_DENIED;
+	}
+
+	maxcnt = rd->readx.in.maxcnt;
+	if (maxcnt > UINT16_MAX && req->ctx->protocol < PROTOCOL_SMB2) {
+		maxcnt = 0;
+	}
+
+	status = pvfs_check_lock(pvfs, f, req->smbpid, 
+				 rd->readx.in.offset,
+				 maxcnt,
+				 READ_LOCK);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	if (f->handle->name->stream_name) {
+		ret = pvfs_stream_read(pvfs, f->handle, 
+				       rd->readx.out.data, maxcnt, rd->readx.in.offset);
+	} else {
+#if HAVE_LINUX_AIO
+		/* possibly try an aio read */
+		if ((req->async_states->state & NTVFS_ASYNC_STATE_MAY_ASYNC) &&
+		    (pvfs->flags & PVFS_FLAG_LINUX_AIO)) {
+			status = pvfs_aio_pread(req, rd, f, maxcnt);
+			if (NT_STATUS_IS_OK(status)) {
+				return NT_STATUS_OK;
+			}
+		}
+#endif
+		ret = pread(f->handle->fd, 
+			    rd->readx.out.data, 
+			    maxcnt,
+			    rd->readx.in.offset);
+	}
+	if (ret == -1) {
+		return pvfs_map_errno(pvfs, errno);
+	}
+
+	/* only SMB2 honors mincnt */
+	if (req->ctx->protocol == PROTOCOL_SMB2) {
+		if (rd->readx.in.mincnt > ret ||
+		    (ret == 0 && maxcnt > 0)) {
+			return NT_STATUS_END_OF_FILE;
+		}
+	}
+
+	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; 
+
+	return NT_STATUS_OK;
+}