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https://github.com/samba-team/samba.git
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c510bd332e
Signed-off-by: David Mulder <dmulder@suse.com> Reviewed-by: Jeremy Allison <jra@samba.org>
196 lines
5.8 KiB
C
196 lines
5.8 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 3.0
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async_io read handling using POSIX async io.
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Copyright (C) Jeremy Allison 2005.
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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 "smbd/smbd.h"
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#include "smbd/globals.h"
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#include "../lib/util/tevent_ntstatus.h"
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#include "../lib/util/tevent_unix.h"
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static void aio_pread_smb1_done(struct tevent_req *req);
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/****************************************************************************
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Set up an aio request from a SMBreadX call.
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*****************************************************************************/
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NTSTATUS schedule_aio_read_and_X(connection_struct *conn,
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struct smb_request *smbreq,
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files_struct *fsp, off_t startpos,
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size_t smb_maxcnt)
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{
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struct aio_extra *aio_ex;
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size_t bufsize;
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size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
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struct tevent_req *req;
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bool ok;
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ok = vfs_valid_pread_range(startpos, smb_maxcnt);
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if (!ok) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (fsp_is_alternate_stream(fsp)) {
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DEBUG(10, ("AIO on streams not yet supported\n"));
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return NT_STATUS_RETRY;
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}
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if ((!min_aio_read_size || (smb_maxcnt < min_aio_read_size))
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&& !SMB_VFS_AIO_FORCE(fsp)) {
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/* Too small a read for aio request. */
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DEBUG(10,("schedule_aio_read_and_X: read size (%u) too small "
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"for minimum aio_read of %u\n",
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(unsigned int)smb_maxcnt,
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(unsigned int)min_aio_read_size ));
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return NT_STATUS_RETRY;
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}
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/* Only do this on non-chained and non-chaining reads */
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if (req_is_in_chain(smbreq)) {
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return NT_STATUS_RETRY;
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}
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/* The following is safe from integer wrap as we've already checked
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smb_maxcnt is 128k or less. Wct is 12 for read replies */
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bufsize = smb_size + 12 * 2 + smb_maxcnt + 1 /* padding byte */;
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if ((aio_ex = create_aio_extra(NULL, fsp, bufsize)) == NULL) {
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DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n"));
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return NT_STATUS_NO_MEMORY;
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}
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construct_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
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srv_set_message((char *)aio_ex->outbuf.data, 12, 0, True);
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SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
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SCVAL(smb_buf(aio_ex->outbuf.data), 0, 0); /* padding byte */
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init_strict_lock_struct(fsp,
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(uint64_t)smbreq->smbpid,
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(uint64_t)startpos,
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(uint64_t)smb_maxcnt,
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READ_LOCK,
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lp_posix_cifsu_locktype(fsp),
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&aio_ex->lock);
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/* Take the lock until the AIO completes. */
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if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
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TALLOC_FREE(aio_ex);
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return NT_STATUS_FILE_LOCK_CONFLICT;
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}
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aio_ex->nbyte = smb_maxcnt;
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aio_ex->offset = startpos;
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req = SMB_VFS_PREAD_SEND(aio_ex, fsp->conn->sconn->ev_ctx,
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fsp,
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smb_buf(aio_ex->outbuf.data) + 1 /* pad */,
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smb_maxcnt, startpos);
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if (req == NULL) {
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DEBUG(0,("schedule_aio_read_and_X: aio_read failed. "
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"Error %s\n", strerror(errno) ));
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TALLOC_FREE(aio_ex);
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return NT_STATUS_RETRY;
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}
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tevent_req_set_callback(req, aio_pread_smb1_done, aio_ex);
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if (!aio_add_req_to_fsp(fsp, req)) {
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DEBUG(1, ("Could not add req to fsp\n"));
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TALLOC_FREE(aio_ex);
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return NT_STATUS_RETRY;
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}
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aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
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DEBUG(10,("schedule_aio_read_and_X: scheduled aio_read for file %s, "
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"offset %.0f, len = %u (mid = %u)\n",
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fsp_str_dbg(fsp), (double)startpos, (unsigned int)smb_maxcnt,
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(unsigned int)aio_ex->smbreq->mid ));
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return NT_STATUS_OK;
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}
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static void aio_pread_smb1_done(struct tevent_req *req)
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{
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struct aio_extra *aio_ex = tevent_req_callback_data(
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req, struct aio_extra);
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files_struct *fsp = aio_ex->fsp;
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size_t outsize;
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char *outbuf = (char *)aio_ex->outbuf.data;
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ssize_t nread;
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struct vfs_aio_state vfs_aio_state;
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nread = SMB_VFS_PREAD_RECV(req, &vfs_aio_state);
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TALLOC_FREE(req);
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DEBUG(10, ("pread_recv returned %d, err = %s\n", (int)nread,
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(nread == -1) ? strerror(vfs_aio_state.error) : "no error"));
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if (fsp == NULL) {
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DEBUG( 3, ("aio_pread_smb1_done: file closed whilst "
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"aio outstanding (mid[%llu]).\n",
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(unsigned long long)aio_ex->smbreq->mid));
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TALLOC_FREE(aio_ex);
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return;
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}
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if (nread < 0) {
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DEBUG( 3, ("handle_aio_read_complete: file %s nread == %d. "
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"Error = %s\n", fsp_str_dbg(fsp), (int)nread,
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strerror(vfs_aio_state.error)));
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ERROR_NT(map_nt_error_from_unix(vfs_aio_state.error));
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outsize = srv_set_message(outbuf,0,0,true);
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} else {
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outsize = setup_readX_header(outbuf, nread);
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fh_set_pos(aio_ex->fsp->fh, aio_ex->offset + nread);
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fh_set_position_information(aio_ex->fsp->fh,
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fh_get_pos(aio_ex->fsp->fh));
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DEBUG( 3, ("handle_aio_read_complete file %s max=%d "
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"nread=%d\n", fsp_str_dbg(fsp),
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(int)aio_ex->nbyte, (int)nread ) );
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}
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if (outsize <= 4) {
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DBG_INFO("Invalid outsize (%zu)\n", outsize);
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TALLOC_FREE(aio_ex);
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return;
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}
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outsize -= 4;
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_smb_setlen_large(outbuf, outsize);
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show_msg(outbuf);
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if (!srv_send_smb(aio_ex->smbreq->xconn, outbuf,
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true, aio_ex->smbreq->seqnum+1,
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IS_CONN_ENCRYPTED(fsp->conn), NULL)) {
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exit_server_cleanly("handle_aio_read_complete: srv_send_smb "
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"failed.");
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}
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DEBUG(10, ("handle_aio_read_complete: scheduled aio_read completed "
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"for file %s, offset %.0f, len = %u\n",
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fsp_str_dbg(fsp), (double)aio_ex->offset,
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(unsigned int)nread));
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TALLOC_FREE(aio_ex);
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}
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