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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2020 Tintri by DDN, Inc. All rights reserved.
* Copyright 2022 RackTop Systems, Inc.
*/
/*
* Dispatch function for SMB2_WRITE
*/
#include <smbsrv/smb2_kproto.h>
#include <smbsrv/smb_fsops.h>
boolean_t smb_allow_unbuffered = B_TRUE;
smb_sdrc_t
smb2_write(smb_request_t *sr)
{
smb_rw_param_t *param = NULL;
smb_ofile_t *of = NULL;
smb_vdb_t *vdb = NULL;
uint16_t StructSize;
uint16_t DataOff;
uint32_t Length;
uint64_t Offset;
smb2fid_t smb2fid;
uint32_t Channel;
uint32_t Remaining;
uint16_t ChanInfoOffset;
uint16_t ChanInfoLength;
uint32_t Flags;
uint32_t XferCount;
uint32_t status;
int data_chain_off, skip;
int stability = 0;
int rc = 0;
boolean_t unbuffered = B_FALSE;
/*
* Decode SMB2 Write request
*/
rc = smb_mbc_decodef(
&sr->smb_data,
"wwlqqqllwwl",
&StructSize, /* w */
&DataOff, /* w */
&Length, /* l */
&Offset, /* q */
&smb2fid.persistent, /* q */
&smb2fid.temporal, /* q */
&Channel, /* l */
&Remaining, /* l */
&ChanInfoOffset, /* w */
&ChanInfoLength, /* w */
&Flags); /* l */
if (rc)
return (SDRC_ERROR);
if (StructSize != 49)
return (SDRC_ERROR);
/*
* Setup an smb_rw_param_t which contains the VDB we need.
* This is automatically free'd.
*/
param = smb_srm_zalloc(sr, sizeof (*param));
param->rw_offset = Offset;
param->rw_count = Length;
/* Note that the dtrace provider uses sr->arg.rw */
sr->arg.rw = param;
/*
* Skip any padding before the write data.
*/
data_chain_off = sr->smb2_cmd_hdr + DataOff;
skip = data_chain_off - sr->smb_data.chain_offset;
if (skip < 0)
return (SDRC_ERROR);
if (skip > 0)
(void) smb_mbc_decodef(&sr->smb_data, "#.", skip);
/*
* Decode the write data (payload)
*/
if (Length > smb2_max_rwsize)
return (SDRC_ERROR);
vdb = ¶m->rw_vdb;
rc = smb_mbc_decodef(&sr->smb_data, "#B", Length, vdb);
if (rc != 0 || vdb->vdb_len != Length)
return (SDRC_ERROR);
vdb->vdb_uio.uio_loffset = (offset_t)Offset;
/*
* Want FID lookup before the start probe.
*/
status = smb2sr_lookup_fid(sr, &smb2fid);
of = sr->fid_ofile;
DTRACE_SMB2_START(op__Write, smb_request_t *, sr); /* arg.rw */
if (status)
goto errout; /* Bad FID */
XferCount = 0;
if (Length == 0)
goto errout;
/*
* Unbuffered refers to the MS-FSA Write argument by the same name.
* It indicates that the cache for this range should be flushed to disk,
* and data written directly to disk, bypassing the cache.
* We don't allow that degree of cache management.
* Translate this directly as FSYNC,
* which should at least flush the cache.
*/
if (smb_allow_unbuffered &&
(Flags & SMB2_WRITEFLAG_WRITE_UNBUFFERED) != 0)
unbuffered = B_TRUE;
switch (of->f_tree->t_res_type & STYPE_MASK) {
case STYPE_DISKTREE:
case STYPE_PRINTQ:
if (!smb_node_is_dir(of->f_node)) {
/* Check for conflicting locks. */
rc = smb_lock_range_access(sr, of->f_node,
Offset, Length, B_TRUE);
if (rc) {
rc = ERANGE;
break;
}
}
if (unbuffered || (Flags & SMB2_WRITEFLAG_WRITE_THROUGH) != 0 ||
(of->f_node->flags & NODE_FLAGS_WRITE_THROUGH) != 0) {
stability = FSYNC;
}
rc = smb_fsop_write(sr, of->f_cr, of->f_node, of,
&vdb->vdb_uio, &XferCount, stability);
if (rc)
break;
/* This revokes read cache delegations. */
(void) smb_oplock_break_WRITE(of->f_node, of);
/*
* Don't want the performance cost of generating
* change notify events on every write. Instead:
* Keep track of the fact that we have written
* data via this handle, and do change notify
* work on the first write, and during close.
*/
if (of->f_written == B_FALSE) {
of->f_written = B_TRUE;
smb_node_notify_modified(of->f_node);
}
break;
case STYPE_IPC:
if (unbuffered || (Flags & SMB2_WRITEFLAG_WRITE_THROUGH) != 0)
rc = EINVAL;
else
rc = smb_opipe_write(sr, &vdb->vdb_uio);
if (rc == 0)
XferCount = Length;
break;
default:
rc = EACCES;
break;
}
status = smb_errno2status(rc);
errout:
sr->smb2_status = status;
DTRACE_SMB2_DONE(op__Write, smb_request_t *, sr); /* arg.rw */
if (status) {
smb2sr_put_error(sr, status);
return (SDRC_SUCCESS);
}
/*
* Encode SMB2 Write reply
*/
DataOff = SMB2_HDR_SIZE + 16;
rc = smb_mbc_encodef(
&sr->reply, "wwlll",
17, /* StructSize */ /* w */
0, /* reserved */ /* w */
XferCount, /* l */
0, /* DataRemaining */ /* l */
0); /* Channel Info */ /* l */
if (rc) {
sr->smb2_status = NT_STATUS_INTERNAL_ERROR;
return (SDRC_ERROR);
}
mutex_enter(&of->f_mutex);
of->f_seek_pos = Offset + XferCount;
mutex_exit(&of->f_mutex);
return (SDRC_SUCCESS);
}
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