Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 409 insertions, 0 deletions

diff --git a/source3/smbd/smb1_aio.c b/source3/smbd/smb1_aio.c
new file mode 100644
index 0000000..d54a372
--- /dev/null
+++ b/source3/smbd/smb1_aio.c
@@ -0,0 +1,409 @@
+/*
+   Unix SMB/Netbios implementation.
+   Version 3.0
+   async_io read handling using POSIX async io.
+   Copyright (C) Jeremy Allison 2005.
+
+   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 "smbd/smbd.h"
+#include "smbd/globals.h"
+#include "../lib/util/tevent_ntstatus.h"
+#include "../lib/util/tevent_unix.h"
+
+static void aio_pread_smb1_done(struct tevent_req *req);
+
+/****************************************************************************
+ Set up an aio request from a SMBreadX call.
+*****************************************************************************/
+
+NTSTATUS schedule_aio_read_and_X(connection_struct *conn,
+			     struct smb_request *smbreq,
+			     files_struct *fsp, off_t startpos,
+			     size_t smb_maxcnt)
+{
+	struct aio_extra *aio_ex;
+	size_t bufsize;
+	size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
+	struct tevent_req *req;
+	bool ok;
+
+	ok = vfs_valid_pread_range(startpos, smb_maxcnt);
+	if (!ok) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	if (fsp_is_alternate_stream(fsp)) {
+		DEBUG(10, ("AIO on streams not yet supported\n"));
+		return NT_STATUS_RETRY;
+	}
+
+	if ((!min_aio_read_size || (smb_maxcnt < min_aio_read_size))
+	    && !SMB_VFS_AIO_FORCE(fsp)) {
+		/* Too small a read for aio request. */
+		DEBUG(10,("schedule_aio_read_and_X: read size (%u) too small "
+			  "for minimum aio_read of %u\n",
+			  (unsigned int)smb_maxcnt,
+			  (unsigned int)min_aio_read_size ));
+		return NT_STATUS_RETRY;
+	}
+
+	/* Only do this on non-chained and non-chaining reads */
+        if (req_is_in_chain(smbreq)) {
+		return NT_STATUS_RETRY;
+	}
+
+	/* The following is safe from integer wrap as we've already checked
+	   smb_maxcnt is 128k or less. Wct is 12 for read replies */
+
+	bufsize = smb_size + 12 * 2 + smb_maxcnt + 1 /* padding byte */;
+
+	if ((aio_ex = create_aio_extra(NULL, fsp, bufsize)) == NULL) {
+		DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n"));
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	construct_smb1_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
+	srv_smb1_set_message((char *)aio_ex->outbuf.data, 12, 0, True);
+	SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
+	SCVAL(smb_buf(aio_ex->outbuf.data), 0, 0); /* padding byte */
+
+	init_strict_lock_struct(fsp,
+			(uint64_t)smbreq->smbpid,
+			(uint64_t)startpos,
+			(uint64_t)smb_maxcnt,
+			READ_LOCK,
+			lp_posix_cifsu_locktype(fsp),
+			&aio_ex->lock);
+
+	/* Take the lock until the AIO completes. */
+	if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
+		TALLOC_FREE(aio_ex);
+		return NT_STATUS_FILE_LOCK_CONFLICT;
+	}
+
+	aio_ex->nbyte = smb_maxcnt;
+	aio_ex->offset = startpos;
+
+	req = SMB_VFS_PREAD_SEND(aio_ex, fsp->conn->sconn->ev_ctx,
+				 fsp,
+				 smb_buf(aio_ex->outbuf.data) + 1 /* pad */,
+				 smb_maxcnt, startpos);
+	if (req == NULL) {
+		DEBUG(0,("schedule_aio_read_and_X: aio_read failed. "
+			 "Error %s\n", strerror(errno) ));
+		TALLOC_FREE(aio_ex);
+		return NT_STATUS_RETRY;
+	}
+	tevent_req_set_callback(req, aio_pread_smb1_done, aio_ex);
+
+	if (!aio_add_req_to_fsp(fsp, req)) {
+		DEBUG(1, ("Could not add req to fsp\n"));
+		TALLOC_FREE(aio_ex);
+		return NT_STATUS_RETRY;
+	}
+
+	aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
+
+	DEBUG(10,("schedule_aio_read_and_X: scheduled aio_read for file %s, "
+		  "offset %.0f, len = %u (mid = %u)\n",
+		  fsp_str_dbg(fsp), (double)startpos, (unsigned int)smb_maxcnt,
+		  (unsigned int)aio_ex->smbreq->mid ));
+
+	return NT_STATUS_OK;
+}
+
+static void aio_pread_smb1_done(struct tevent_req *req)
+{
+	struct aio_extra *aio_ex = tevent_req_callback_data(
+		req, struct aio_extra);
+	files_struct *fsp = aio_ex->fsp;
+	size_t outsize;
+	char *outbuf = (char *)aio_ex->outbuf.data;
+	ssize_t nread;
+	struct vfs_aio_state vfs_aio_state;
+
+	nread = SMB_VFS_PREAD_RECV(req, &vfs_aio_state);
+	TALLOC_FREE(req);
+
+	DEBUG(10, ("pread_recv returned %d, err = %s\n", (int)nread,
+		   (nread == -1) ? strerror(vfs_aio_state.error) : "no error"));
+
+	if (fsp == NULL) {
+		DEBUG( 3, ("aio_pread_smb1_done: file closed whilst "
+			   "aio outstanding (mid[%llu]).\n",
+			   (unsigned long long)aio_ex->smbreq->mid));
+		TALLOC_FREE(aio_ex);
+		return;
+	}
+
+	if (nread < 0) {
+		DEBUG( 3, ("handle_aio_read_complete: file %s nread == %d. "
+			   "Error = %s\n", fsp_str_dbg(fsp), (int)nread,
+			   strerror(vfs_aio_state.error)));
+
+		ERROR_NT(map_nt_error_from_unix(vfs_aio_state.error));
+		outsize = srv_smb1_set_message(outbuf,0,0,true);
+	} else {
+		outsize = setup_readX_header(outbuf, nread);
+
+		fh_set_pos(aio_ex->fsp->fh, aio_ex->offset + nread);
+		fh_set_position_information(aio_ex->fsp->fh,
+					    fh_get_pos(aio_ex->fsp->fh));
+
+		DEBUG( 3, ("handle_aio_read_complete file %s max=%d "
+			   "nread=%d\n", fsp_str_dbg(fsp),
+			   (int)aio_ex->nbyte, (int)nread ) );
+
+	}
+
+	if (outsize <= 4) {
+		DBG_INFO("Invalid outsize (%zu)\n", outsize);
+		TALLOC_FREE(aio_ex);
+		return;
+	}
+	outsize -= 4;
+	_smb_setlen_large(outbuf, outsize);
+
+	show_msg(outbuf);
+	if (!smb1_srv_send(aio_ex->smbreq->xconn,
+			   outbuf,
+			   true,
+			   aio_ex->smbreq->seqnum + 1,
+			   IS_CONN_ENCRYPTED(fsp->conn))) {
+		exit_server_cleanly("handle_aio_read_complete: smb1_srv_send "
+				    "failed.");
+	}
+
+	DEBUG(10, ("handle_aio_read_complete: scheduled aio_read completed "
+		   "for file %s, offset %.0f, len = %u\n",
+		   fsp_str_dbg(fsp), (double)aio_ex->offset,
+		   (unsigned int)nread));
+
+	TALLOC_FREE(aio_ex);
+}
+
+static void aio_pwrite_smb1_done(struct tevent_req *req);
+
+/****************************************************************************
+ Set up an aio request from a SMBwriteX call.
+*****************************************************************************/
+
+NTSTATUS schedule_aio_write_and_X(connection_struct *conn,
+			      struct smb_request *smbreq,
+			      files_struct *fsp, const char *data,
+			      off_t startpos,
+			      size_t numtowrite)
+{
+	struct aio_extra *aio_ex;
+	size_t bufsize;
+	size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
+	struct tevent_req *req;
+
+	if (fsp_is_alternate_stream(fsp)) {
+		DEBUG(10, ("AIO on streams not yet supported\n"));
+		return NT_STATUS_RETRY;
+	}
+
+	if ((!min_aio_write_size || (numtowrite < min_aio_write_size))
+	    && !SMB_VFS_AIO_FORCE(fsp)) {
+		/* Too small a write for aio request. */
+		DEBUG(10,("schedule_aio_write_and_X: write size (%u) too "
+			  "small for minimum aio_write of %u\n",
+			  (unsigned int)numtowrite,
+			  (unsigned int)min_aio_write_size ));
+		return NT_STATUS_RETRY;
+	}
+
+	/* Only do this on non-chained and non-chaining writes */
+        if (req_is_in_chain(smbreq)) {
+		return NT_STATUS_RETRY;
+	}
+
+	bufsize = smb_size + 6*2;
+
+	if (!(aio_ex = create_aio_extra(NULL, fsp, bufsize))) {
+		DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
+		return NT_STATUS_NO_MEMORY;
+	}
+	aio_ex->write_through = BITSETW(smbreq->vwv+7,0);
+
+	construct_smb1_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
+	srv_smb1_set_message((char *)aio_ex->outbuf.data, 6, 0, True);
+	SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
+
+	init_strict_lock_struct(fsp,
+			(uint64_t)smbreq->smbpid,
+			(uint64_t)startpos,
+			(uint64_t)numtowrite,
+			WRITE_LOCK,
+			lp_posix_cifsu_locktype(fsp),
+			&aio_ex->lock);
+
+	/* Take the lock until the AIO completes. */
+	if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
+		TALLOC_FREE(aio_ex);
+		return NT_STATUS_FILE_LOCK_CONFLICT;
+	}
+
+	aio_ex->nbyte = numtowrite;
+	aio_ex->offset = startpos;
+
+	req = pwrite_fsync_send(aio_ex, fsp->conn->sconn->ev_ctx, fsp,
+				data, numtowrite, startpos,
+				aio_ex->write_through);
+	if (req == NULL) {
+		DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. "
+			 "Error %s\n", strerror(errno) ));
+		TALLOC_FREE(aio_ex);
+		return NT_STATUS_RETRY;
+	}
+	tevent_req_set_callback(req, aio_pwrite_smb1_done, aio_ex);
+
+	if (!aio_add_req_to_fsp(fsp, req)) {
+		DEBUG(1, ("Could not add req to fsp\n"));
+		TALLOC_FREE(aio_ex);
+		return NT_STATUS_RETRY;
+	}
+
+	aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
+
+	/* This should actually be improved to span the write. */
+	contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
+	contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
+
+	if (!aio_ex->write_through && !lp_sync_always(SNUM(fsp->conn))
+	    && fsp->fsp_flags.aio_write_behind)
+	{
+		/* Lie to the client and immediately claim we finished the
+		 * write. */
+	        SSVAL(aio_ex->outbuf.data,smb_vwv2,numtowrite);
+                SSVAL(aio_ex->outbuf.data,smb_vwv4,(numtowrite>>16)&1);
+		show_msg((char *)aio_ex->outbuf.data);
+		if (!smb1_srv_send(aio_ex->smbreq->xconn,
+				   (char *)aio_ex->outbuf.data,
+				   true,
+				   aio_ex->smbreq->seqnum + 1,
+				   IS_CONN_ENCRYPTED(fsp->conn))) {
+			exit_server_cleanly("schedule_aio_write_and_X: "
+					    "smb1_srv_send failed.");
+		}
+		DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
+			  "behind for file %s\n", fsp_str_dbg(fsp)));
+	}
+
+	DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write for file "
+		  "%s, offset %.0f, len = %u (mid = %u)\n",
+		  fsp_str_dbg(fsp), (double)startpos, (unsigned int)numtowrite,
+		  (unsigned int)aio_ex->smbreq->mid));
+
+	return NT_STATUS_OK;
+}
+
+static void aio_pwrite_smb1_done(struct tevent_req *req)
+{
+	struct aio_extra *aio_ex = tevent_req_callback_data(
+		req, struct aio_extra);
+	files_struct *fsp = aio_ex->fsp;
+	char *outbuf = (char *)aio_ex->outbuf.data;
+	ssize_t numtowrite = aio_ex->nbyte;
+	ssize_t nwritten;
+	int err;
+
+	nwritten = pwrite_fsync_recv(req, &err);
+	TALLOC_FREE(req);
+
+	DEBUG(10, ("pwrite_recv returned %d, err = %s\n", (int)nwritten,
+		   (nwritten == -1) ? strerror(err) : "no error"));
+
+	if (fsp == NULL) {
+		DEBUG( 3, ("aio_pwrite_smb1_done: file closed whilst "
+			   "aio outstanding (mid[%llu]).\n",
+			   (unsigned long long)aio_ex->smbreq->mid));
+		TALLOC_FREE(aio_ex);
+		return;
+	}
+
+	mark_file_modified(fsp);
+
+	if (fsp->fsp_flags.aio_write_behind) {
+
+		if (nwritten != numtowrite) {
+			if (nwritten == -1) {
+				DEBUG(5,("handle_aio_write_complete: "
+					 "aio_write_behind failed ! File %s "
+					 "is corrupt ! Error %s\n",
+					 fsp_str_dbg(fsp), strerror(err)));
+			} else {
+				DEBUG(0,("handle_aio_write_complete: "
+					 "aio_write_behind failed ! File %s "
+					 "is corrupt ! Wanted %u bytes but "
+					 "only wrote %d\n", fsp_str_dbg(fsp),
+					 (unsigned int)numtowrite,
+					 (int)nwritten ));
+			}
+		} else {
+			DEBUG(10,("handle_aio_write_complete: "
+				  "aio_write_behind completed for file %s\n",
+				  fsp_str_dbg(fsp)));
+		}
+		/* TODO: should no return success in case of an error !!! */
+		TALLOC_FREE(aio_ex);
+		return;
+	}
+
+	/* We don't need outsize or set_message here as we've already set the
+	   fixed size length when we set up the aio call. */
+
+	if (nwritten == -1) {
+		DEBUG(3, ("handle_aio_write: file %s wanted %u bytes. "
+			  "nwritten == %d. Error = %s\n",
+			  fsp_str_dbg(fsp), (unsigned int)numtowrite,
+			  (int)nwritten, strerror(err)));
+
+		ERROR_NT(map_nt_error_from_unix(err));
+		srv_smb1_set_message(outbuf,0,0,true);
+        } else {
+		SSVAL(outbuf,smb_vwv2,nwritten);
+		SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
+		if (nwritten < (ssize_t)numtowrite) {
+			SCVAL(outbuf,smb_rcls,ERRHRD);
+			SSVAL(outbuf,smb_err,ERRdiskfull);
+		}
+
+		DEBUG(3,("handle_aio_write: %s, num=%d wrote=%d\n",
+			 fsp_fnum_dbg(fsp), (int)numtowrite, (int)nwritten));
+
+		fh_set_pos(aio_ex->fsp->fh, aio_ex->offset + nwritten);
+	}
+
+	show_msg(outbuf);
+	if (!smb1_srv_send(aio_ex->smbreq->xconn,
+			   outbuf,
+			   true,
+			   aio_ex->smbreq->seqnum + 1,
+			   IS_CONN_ENCRYPTED(fsp->conn))) {
+		exit_server_cleanly("handle_aio_write_complete: "
+				    "smb1_srv_send failed.");
+	}
+
+	DEBUG(10, ("handle_aio_write_complete: scheduled aio_write completed "
+		   "for file %s, offset %.0f, requested %u, written = %u\n",
+		   fsp_str_dbg(fsp), (double)aio_ex->offset,
+		   (unsigned int)numtowrite, (unsigned int)nwritten));
+
+	TALLOC_FREE(aio_ex);
+}