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12f1d94a4e
Looks larger than it is, "git clang-format" added a few lines Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
410 lines
12 KiB
C
410 lines
12 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_smb1_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
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srv_smb1_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_smb1_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 (!smb1_srv_send(aio_ex->smbreq->xconn,
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outbuf,
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true,
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aio_ex->smbreq->seqnum + 1,
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IS_CONN_ENCRYPTED(fsp->conn))) {
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exit_server_cleanly("handle_aio_read_complete: smb1_srv_send "
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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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static void aio_pwrite_smb1_done(struct tevent_req *req);
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/****************************************************************************
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Set up an aio request from a SMBwriteX call.
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*****************************************************************************/
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NTSTATUS schedule_aio_write_and_X(connection_struct *conn,
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struct smb_request *smbreq,
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files_struct *fsp, const char *data,
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off_t startpos,
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size_t numtowrite)
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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_write_size = lp_aio_write_size(SNUM(conn));
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struct tevent_req *req;
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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_write_size || (numtowrite < min_aio_write_size))
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&& !SMB_VFS_AIO_FORCE(fsp)) {
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/* Too small a write for aio request. */
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DEBUG(10,("schedule_aio_write_and_X: write size (%u) too "
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"small for minimum aio_write of %u\n",
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(unsigned int)numtowrite,
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(unsigned int)min_aio_write_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 writes */
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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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bufsize = smb_size + 6*2;
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if (!(aio_ex = create_aio_extra(NULL, fsp, bufsize))) {
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DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
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return NT_STATUS_NO_MEMORY;
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}
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aio_ex->write_through = BITSETW(smbreq->vwv+7,0);
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construct_smb1_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
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srv_smb1_set_message((char *)aio_ex->outbuf.data, 6, 0, True);
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SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
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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)numtowrite,
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WRITE_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 = numtowrite;
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aio_ex->offset = startpos;
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req = pwrite_fsync_send(aio_ex, fsp->conn->sconn->ev_ctx, fsp,
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data, numtowrite, startpos,
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aio_ex->write_through);
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if (req == NULL) {
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DEBUG(3,("schedule_aio_wrote_and_X: aio_write 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_pwrite_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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/* This should actually be improved to span the write. */
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contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
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contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
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if (!aio_ex->write_through && !lp_sync_always(SNUM(fsp->conn))
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&& fsp->fsp_flags.aio_write_behind)
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{
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/* Lie to the client and immediately claim we finished the
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* write. */
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SSVAL(aio_ex->outbuf.data,smb_vwv2,numtowrite);
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SSVAL(aio_ex->outbuf.data,smb_vwv4,(numtowrite>>16)&1);
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show_msg((char *)aio_ex->outbuf.data);
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if (!smb1_srv_send(aio_ex->smbreq->xconn,
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(char *)aio_ex->outbuf.data,
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true,
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aio_ex->smbreq->seqnum + 1,
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IS_CONN_ENCRYPTED(fsp->conn))) {
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exit_server_cleanly("schedule_aio_write_and_X: "
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"smb1_srv_send failed.");
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}
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DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
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"behind for file %s\n", fsp_str_dbg(fsp)));
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}
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DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write for file "
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"%s, offset %.0f, len = %u (mid = %u)\n",
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fsp_str_dbg(fsp), (double)startpos, (unsigned int)numtowrite,
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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_pwrite_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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char *outbuf = (char *)aio_ex->outbuf.data;
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ssize_t numtowrite = aio_ex->nbyte;
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ssize_t nwritten;
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int err;
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nwritten = pwrite_fsync_recv(req, &err);
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TALLOC_FREE(req);
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DEBUG(10, ("pwrite_recv returned %d, err = %s\n", (int)nwritten,
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(nwritten == -1) ? strerror(err) : "no error"));
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if (fsp == NULL) {
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DEBUG( 3, ("aio_pwrite_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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mark_file_modified(fsp);
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if (fsp->fsp_flags.aio_write_behind) {
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if (nwritten != numtowrite) {
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if (nwritten == -1) {
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DEBUG(5,("handle_aio_write_complete: "
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"aio_write_behind failed ! File %s "
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"is corrupt ! Error %s\n",
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fsp_str_dbg(fsp), strerror(err)));
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} else {
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DEBUG(0,("handle_aio_write_complete: "
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"aio_write_behind failed ! File %s "
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"is corrupt ! Wanted %u bytes but "
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"only wrote %d\n", fsp_str_dbg(fsp),
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(unsigned int)numtowrite,
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(int)nwritten ));
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}
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} else {
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DEBUG(10,("handle_aio_write_complete: "
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"aio_write_behind completed for file %s\n",
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fsp_str_dbg(fsp)));
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}
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/* TODO: should no return success in case of an error !!! */
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TALLOC_FREE(aio_ex);
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return;
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}
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/* We don't need outsize or set_message here as we've already set the
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fixed size length when we set up the aio call. */
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if (nwritten == -1) {
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DEBUG(3, ("handle_aio_write: file %s wanted %u bytes. "
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"nwritten == %d. Error = %s\n",
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fsp_str_dbg(fsp), (unsigned int)numtowrite,
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(int)nwritten, strerror(err)));
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ERROR_NT(map_nt_error_from_unix(err));
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srv_smb1_set_message(outbuf,0,0,true);
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} else {
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SSVAL(outbuf,smb_vwv2,nwritten);
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SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
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if (nwritten < (ssize_t)numtowrite) {
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SCVAL(outbuf,smb_rcls,ERRHRD);
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SSVAL(outbuf,smb_err,ERRdiskfull);
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}
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DEBUG(3,("handle_aio_write: %s, num=%d wrote=%d\n",
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fsp_fnum_dbg(fsp), (int)numtowrite, (int)nwritten));
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fh_set_pos(aio_ex->fsp->fh, aio_ex->offset + nwritten);
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}
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show_msg(outbuf);
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if (!smb1_srv_send(aio_ex->smbreq->xconn,
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outbuf,
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true,
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aio_ex->smbreq->seqnum + 1,
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IS_CONN_ENCRYPTED(fsp->conn))) {
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exit_server_cleanly("handle_aio_write_complete: "
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"smb1_srv_send failed.");
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}
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DEBUG(10, ("handle_aio_write_complete: scheduled aio_write completed "
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"for file %s, offset %.0f, requested %u, written = %u\n",
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fsp_str_dbg(fsp), (double)aio_ex->offset,
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(unsigned int)numtowrite, (unsigned int)nwritten));
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TALLOC_FREE(aio_ex);
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}
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