mirror of
https://github.com/samba-team/samba.git
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0479a2f1cb
There are still a few tidyups of old FSF addresses to come (in both s3
and s4). More commits soon.
(This used to be commit fcf38a38ac)
104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/*
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Unix SMB/CIFS implementation.
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POSIX NTVFS backend - read
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Copyright (C) Andrew Tridgell 2004
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "vfs_posix.h"
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#include "lib/events/events.h"
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/*
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read from a file
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*/
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NTSTATUS pvfs_read(struct ntvfs_module_context *ntvfs,
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struct ntvfs_request *req, union smb_read *rd)
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{
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struct pvfs_state *pvfs = ntvfs->private_data;
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ssize_t ret;
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struct pvfs_file *f;
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NTSTATUS status;
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uint32_t maxcnt;
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uint32_t mask;
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if (rd->generic.level != RAW_READ_READX) {
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return ntvfs_map_read(ntvfs, req, rd);
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}
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f = pvfs_find_fd(pvfs, req, rd->readx.in.file.ntvfs);
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if (!f) {
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return NT_STATUS_INVALID_HANDLE;
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}
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if (f->handle->fd == -1) {
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return NT_STATUS_FILE_IS_A_DIRECTORY;
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}
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mask = SEC_FILE_READ_DATA;
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if (rd->readx.in.read_for_execute) {
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mask |= SEC_FILE_EXECUTE;
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}
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if (!(f->access_mask & mask)) {
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return NT_STATUS_ACCESS_DENIED;
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}
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maxcnt = rd->readx.in.maxcnt;
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if (maxcnt > UINT16_MAX && req->ctx->protocol < PROTOCOL_SMB2) {
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maxcnt = 0;
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}
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status = pvfs_check_lock(pvfs, f, req->smbpid,
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rd->readx.in.offset,
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maxcnt,
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READ_LOCK);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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if (f->handle->name->stream_name) {
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ret = pvfs_stream_read(pvfs, f->handle,
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rd->readx.out.data, maxcnt, rd->readx.in.offset);
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} else {
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#if HAVE_LINUX_AIO
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/* possibly try an aio read */
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if ((req->async_states->state & NTVFS_ASYNC_STATE_MAY_ASYNC) &&
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(pvfs->flags & PVFS_FLAG_LINUX_AIO)) {
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status = pvfs_aio_pread(req, rd, f, maxcnt);
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if (NT_STATUS_IS_OK(status)) {
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return NT_STATUS_OK;
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}
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}
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#endif
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ret = pread(f->handle->fd,
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rd->readx.out.data,
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maxcnt,
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rd->readx.in.offset);
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}
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if (ret == -1) {
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return pvfs_map_errno(pvfs, errno);
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}
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f->handle->position = f->handle->seek_offset = rd->readx.in.offset + ret;
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rd->readx.out.nread = ret;
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rd->readx.out.remaining = 0xFFFF;
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rd->readx.out.compaction_mode = 0;
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return NT_STATUS_OK;
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}
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