2 Unix SMB/CIFS implementation.
4 POSIX NTVFS backend - read
6 Copyright (C) Andrew Tridgell 2004
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "vfs_posix.h"
24 #include "lib/events/events.h"
29 NTSTATUS pvfs_read(struct ntvfs_module_context *ntvfs,
30 struct ntvfs_request *req, union smb_read *rd)
32 struct pvfs_state *pvfs = ntvfs->private_data;
39 if (rd->generic.level != RAW_READ_READX) {
40 return ntvfs_map_read(ntvfs, req, rd);
43 f = pvfs_find_fd(pvfs, req, rd->readx.in.file.ntvfs);
45 return NT_STATUS_INVALID_HANDLE;
48 if (f->handle->fd == -1) {
49 return NT_STATUS_FILE_IS_A_DIRECTORY;
52 mask = SEC_FILE_READ_DATA;
53 if (rd->readx.in.read_for_execute) {
54 mask |= SEC_FILE_EXECUTE;
56 if (!(f->access_mask & mask)) {
57 return NT_STATUS_ACCESS_DENIED;
60 maxcnt = rd->readx.in.maxcnt;
61 if (maxcnt > UINT16_MAX && req->ctx->protocol < PROTOCOL_SMB2) {
65 status = pvfs_check_lock(pvfs, f, req->smbpid,
69 if (!NT_STATUS_IS_OK(status)) {
73 if (f->handle->name->stream_name) {
74 ret = pvfs_stream_read(pvfs, f->handle,
75 rd->readx.out.data, maxcnt, rd->readx.in.offset);
78 /* possibly try an aio read */
79 if ((req->async_states->state & NTVFS_ASYNC_STATE_MAY_ASYNC) &&
80 (pvfs->flags & PVFS_FLAG_LINUX_AIO)) {
81 status = pvfs_aio_pread(req, rd, f, maxcnt);
82 if (NT_STATUS_IS_OK(status)) {
87 ret = pread(f->handle->fd,
93 return pvfs_map_errno(pvfs, errno);
96 f->handle->position = f->handle->seek_offset = rd->readx.in.offset + ret;
98 rd->readx.out.nread = ret;
99 rd->readx.out.remaining = 0xFFFF;
100 rd->readx.out.compaction_mode = 0;