fs/smbsrv/smb2_change_notify.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2007, 2010, Oracle and/or its affiliates.
 * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
 */

/*
 * Dispatch function for SMB2_CHANGE_NOTIFY
 */

#include <smbsrv/smb2_kproto.h>

static smb_sdrc_t smb2_change_notify_async(smb_request_t *);

smb_sdrc_t
smb2_change_notify(smb_request_t *sr)
{
    smb_node_t *node = NULL;
    uint16_t StructSize;
    uint16_t iFlags;
    uint32_t oBufLength;
    smb2fid_t smb2fid;
    uint32_t CompletionFilter;
    uint32_t reserved;
    uint32_t status;
    int rc = 0;

    /*
     * SMB2 Change Notify request
     */
    rc = smb_mbc_decodef(
        &sr->smb_data,      "wwlqqll",
        &StructSize,        /* w */
        &iFlags,            /* w */
        &oBufLength,        /* l */
        &smb2fid.persistent,    /* q */
        &smb2fid.temporal,      /* q */
        &CompletionFilter,      /* l */
        &reserved);         /* l */
    if (rc || StructSize != 32)
        return (SDRC_ERROR);

    status = smb2sr_lookup_fid(sr, &smb2fid);
    if (status)
        goto puterror;

    node = sr->fid_ofile->f_node;
    if (node == NULL || !smb_node_is_dir(node)) {
        status = NT_STATUS_INVALID_PARAMETER;
        goto puterror;
    }

    /*
     * Let Change Notify "go async", because it
     * may block indefinitely.
     */
    status = smb2sr_go_async(sr, smb2_change_notify_async);
puterror:
    ASSERT(status != 0);
    smb2sr_put_error(sr, status);
    return (SDRC_SUCCESS);
}

static smb_sdrc_t
smb2_change_notify_async(smb_request_t *sr)
{
    uint16_t StructSize;
    uint16_t iFlags;
    uint32_t oBufLength;
    smb2fid_t smb2fid;
    uint32_t CompletionFilter;
    uint32_t reserved;
    uint32_t status;
    uint16_t DataOff;
    int rc = 0;

    /*
     * SMB2 Change Notify request
     */
    rc = smb_mbc_decodef(
        &sr->smb_data,      "wwlqqll",
        &StructSize,        /* w */
        &iFlags,            /* w */
        &oBufLength,        /* l */
        &smb2fid.persistent,    /* q */
        &smb2fid.temporal,      /* q */
        &CompletionFilter,      /* l */
        &reserved);         /* l */
    if (rc || StructSize != 32)
        return (SDRC_ERROR);

    status = smb2sr_lookup_fid(sr, &smb2fid);
    if (status != 0) {
        smb2sr_put_error(sr, status);
        return (SDRC_SUCCESS);
    }

    CompletionFilter &= FILE_NOTIFY_VALID_MASK;
    if (iFlags & SMB2_WATCH_TREE)
        CompletionFilter |= NODE_FLAGS_WATCH_TREE;

    if (oBufLength > smb2_max_trans)
        oBufLength = smb2_max_trans;
    sr->raw_data.max_bytes = oBufLength;

    status = smb_notify_common(sr, &sr->raw_data, CompletionFilter);
    if (status != 0) {
        smb2sr_put_error(sr, status);
        return (SDRC_SUCCESS);
    }

    /*
     * SMB2 Change Notify reply
     */
    DataOff = SMB2_HDR_SIZE + 8;
    oBufLength = MBC_LENGTH(&sr->raw_data);
    rc = smb_mbc_encodef(
        &sr->reply, "wwlC",
        9,  /* StructSize */    /* w */
        DataOff,            /* w */
        oBufLength,         /* l */
        &sr->raw_data);     /* C */
    if (rc)
        return (SDRC_ERROR);

    return (SDRC_SUCCESS);
}