fs/smbsrv/smb_nt_transact_quota.c

	smb_nt_transact_quota.c revision 8622ec4569457733001d4982ef7f5b44427069be
/*
 * 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 2011 Nexenta Systems, Inc.  All rights reserved.
 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <smbsrv/smb_kproto.h>
#include <smbsrv/smb_fsops.h>
#include <smbsrv/smb_share.h>
#include <smbsrv/string.h>
#include <sys/fs/zfs.h>
#include <smbsrv/smb_xdr.h>
#include <smbsrv/smb_door.h>
#include <smbsrv/smb_idmap.h>

/*
 * A user/group quota entry passed over the wire consists of:
 * - next offset (uint32_t)
 * - length of SID (uint32_t)
 * - last modified time (uint64_t)
 * - quota used (uint64_t)
 * - quota limit (uint64_t)
 * - quota threahold (uint64_t)
 * - variable length sid - max = 32 bytes
 * SMB_QUOTA_SIZE_NO_SID is the size of the above, excluding the sid.
 */
#define SMB_QUOTA_SIZE_NO_SID \
    ((2 * sizeof (uint32_t)) + (4 * sizeof (uint64_t)))
#define SMB_QUOTA_EST_SIZE (SMB_QUOTA_SIZE_NO_SID + SMB_EST_SID_SIZE)
#define SMB_QUOTA_MAX_SIZE (SMB_QUOTA_SIZE_NO_SID + SMB_MAX_SID_SIZE)

static int smb_quota_query(smb_server_t *, smb_quota_query_t *,
    smb_quota_response_t *);
static int smb_quota_set(smb_server_t *, smb_quota_set_t *, uint32_t *);
static uint32_t smb_quota_init_sids(smb_xa_t *, smb_quota_query_t *,
    smb_ofile_t *);
static uint32_t smb_quota_decode_sids(smb_xa_t *, list_t *);
static void smb_quota_free_sids(smb_quota_query_t *);
static void smb_quota_max_quota(smb_xa_t *, smb_quota_query_t *);
static uint32_t smb_quota_decode_quotas(smb_xa_t *, list_t *);
static uint32_t smb_quota_encode_quotas(smb_xa_t *, smb_quota_query_t *,
    smb_quota_response_t *, smb_ofile_t *);
static void smb_quota_free_quotas(list_t *);

/*
 * smb_nt_transact_query_quota
 *
 * This method allows the client to retrieve quota information from
 * the server. The result of the call is returned to the client in the
 * Data part of the transaction response.
 *
 * On entry, the 'TotalParameterCount' field must be equal to 16, and the
 * client parameter block must be encoded with the following parameters:
 *
 * Request                    Description
 * ========================== ==================================
 * WORD fid                   SMB file identifier of the target directory
 * BYTE ReturnSingleEntry     A boolean indicating whether to return
 *                            a single entry (TRUE) or multiple entries (FALSE).
 * BYTE RestartScan           A boolean indicating whether to continue from
 *                            the previous request (FALSE) or restart a new
 *                            sequence (TRUE).
 * DWORD SidListLength        The length, in bytes, of the SidList in the
 *                            data block or 0 if there is no SidList.
 * DWORD StartSidLength       If SidListLength is 0 (i.e. there is no SidList
 *                            in the data block), then this is either:
 *                                 1) the (non-zero) length in bytes of the
 *                                    StartSid in the parameter buffer, or
 *                                 2) if 0, there is no StartSid in the
 *                                    parameter buffer, in which case, all SIDs
 *                                    are to be enumerated as if they were
 *                                    passed in the SidList.
 *                            Otherwise, StartSidLength is ignored.
 * DWORD StartSidOffset       The offset, in bytes, to the StartSid in the
 *                            parameter block (if one exists).
 *
 * One of SidListLength and StartSidLength must be 0.
 *
 * An SMB_COM_NT_TRANSACTION response is sent in reply when the request
 * is successful.  The 'TotalParameterCount' is set to 4, and the parameter
 * block in the server response contains a 32-bit unsigned integer
 * indicating the length, in bytes, of the returned quota information.
 * The 'TotalDataCount' is set to indicate the length of the data buffer,
 * and the data buffer contains the following quota information:
 *
 *  Data Block Encoding                Description
 *  ================================== =================================
 *  ULONG NextEntryOffset;             Offset to start of next entry from
 *                                     start of this entry, or 0 for the
 *                                     final entry
 *  ULONG SidLength;                   Length (bytes) of SID
 *  SMB_TIME ChangeTime;               Time that the quota was last changed
 *  LARGE_INTEGER QuotaUsed;           Amount of quota (bytes) used by user
 *  LARGE_INTEGER QuotaThreshold;      Quota warning limit (bytes) for user
 *  LARGE_INTEGER QuotaLimit;          The quota limit (bytes) for this user
 *  USHORT Sid;                        Search handle
 */
smb_sdrc_t
smb_nt_transact_query_quota(smb_request_t *sr, smb_xa_t *xa)
{
    uint8_t     single, restart;
    uint32_t    sidlistlen, startsidlen, startsidoff;
    smb_node_t  *tnode;
    smb_ofile_t *ofile;
    smb_quota_query_t request;
    smb_quota_response_t reply;
    uint32_t status = NT_STATUS_SUCCESS;

    bzero(&request, sizeof (smb_quota_query_t));
    bzero(&reply, sizeof (smb_quota_response_t));

    if (!smb_tree_has_feature(sr->tid_tree, SMB_TREE_QUOTA)) {
        smbsr_error(sr, NT_STATUS_NOT_SUPPORTED, 0, 0);
        return (SDRC_ERROR);
    }

    if (xa->smb_tpscnt != 16) {
        smbsr_error(sr, NT_STATUS_INVALID_PARAMETER, 0, 0);
        return (SDRC_ERROR);
    }

    if (smb_mbc_decodef(&xa->req_param_mb, "%wbblll", sr, &sr->smb_fid,
        &single, &restart, &sidlistlen, &startsidlen, &startsidoff)) {
        smbsr_error(sr, NT_STATUS_INVALID_PARAMETER, 0, 0);
        return (SDRC_ERROR);
    }

    if ((sidlistlen != 0) && (startsidlen != 0)) {
        smbsr_error(sr, NT_STATUS_INVALID_PARAMETER, 0, 0);
        return (SDRC_ERROR);
    }

    smbsr_lookup_file(sr);
    ofile = sr->fid_ofile;
    if (ofile == NULL) {
        smbsr_error(sr, NT_STATUS_INVALID_HANDLE, ERRDOS, ERRbadfid);
        return (SDRC_ERROR);
    }

    if ((ofile->f_node == NULL) || (ofile->f_ftype != SMB_FTYPE_DISK)) {
        smbsr_error(sr, NT_STATUS_ACCESS_DENIED, ERRDOS,
            ERROR_ACCESS_DENIED);
        smbsr_release_file(sr);
        return (SDRC_ERROR);
    }

    tnode = sr->tid_tree->t_snode;
    request.qq_root_path = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
    if (smb_node_getmntpath(tnode, request.qq_root_path, MAXPATHLEN) != 0) {
        smbsr_error(sr, NT_STATUS_INVALID_PARAMETER, ERRDOS,
            ERROR_INVALID_PARAMETER);
        smbsr_release_file(sr);
        kmem_free(request.qq_root_path, MAXPATHLEN);
        return (SDRC_ERROR);
    }

    if (sidlistlen != 0)
        request.qq_query_op = SMB_QUOTA_QUERY_SIDLIST;
    else if (startsidlen != 0)
        request.qq_query_op = SMB_QUOTA_QUERY_STARTSID;
    else
        request.qq_query_op = SMB_QUOTA_QUERY_ALL;

    request.qq_single = single;
    request.qq_restart = restart;
    smb_quota_max_quota(xa, &request);

    status = smb_quota_init_sids(xa, &request, ofile);

    if (status == NT_STATUS_SUCCESS) {
        if (smb_quota_query(sr->sr_server, &request, &reply) != 0) {
            status = NT_STATUS_INTERNAL_ERROR;
        } else {
            status = reply.qr_status;
            if (status == NT_STATUS_SUCCESS) {
                status = smb_quota_encode_quotas(xa,
                    &request, &reply, ofile);
            }
            xdr_free(smb_quota_response_xdr, (char *)&reply);
        }
    }

    kmem_free(request.qq_root_path, MAXPATHLEN);
    smb_quota_free_sids(&request);

    if (status != NT_STATUS_SUCCESS) {
        if (status == NT_STATUS_NO_MORE_ENTRIES) {
            smb_ofile_set_quota_resume(ofile, NULL);
            smbsr_warn(sr, status, 0, 0);
            status = NT_STATUS_SUCCESS;
        } else {
            smbsr_error(sr, status, 0, 0);
        }
        (void) smb_mbc_encodef(&xa->rep_param_mb, "l", 0);
    }

    smbsr_release_file(sr);
    return ((status == NT_STATUS_SUCCESS) ? SDRC_SUCCESS : SDRC_ERROR);
}

/*
 * smb_nt_transact_set_quota
 *
 * This method allows the client to set quota information on the server.
 * The result status of the call is returned to the client in the
 * 'status' field of the SMB response header.
 *
 * On entry, the 'TotalParameterCount' field must be equal to 2, and the
 * client parameter block must be encoded with the following parameters:
 *
 *  Data Block Encoding                Description
 *  ================================== =================================
 *  ULONG NextEntryOffset;             Offset to start of next entry from
 *                                     start of this entry, or 0 for the
 *                                     final entry
 *  ULONG SidLength;                   Length (bytes) of SID
 *  SMB_TIME ChangeTime;               Time that the quota was last changed
 *  LARGE_INTEGER QuotaUsed;           Amount of quota (bytes) used by user
 *  LARGE_INTEGER QuotaThreshold;      Quota warning limit (bytes) for user
 *  LARGE_INTEGER QuotaLimit;          The quota limit (bytes) for this user
 *  VARIABLE Sid;                      Security identifier of the user
 *
 * An SMB_COM_NT_TRANSACTION response is sent in reply when the request
 * is successful.  The 'TotalParameterCount' and the 'TotalDataCount' are set
 * to 0, and the parameter block 'Status' field in the server SMB response
 * header contains a 32-bit unsigned integer indicating the result status
 * (NT_STATUS_SUCCESS if successful).
 *
 * Only users with Admin privileges (i.e. of the BUILTIN/Administrators
 * group) will be allowed to set quotas.
 */
smb_sdrc_t
smb_nt_transact_set_quota(smb_request_t *sr, smb_xa_t *xa)
{
    char        *root_path;
    uint32_t    status = NT_STATUS_SUCCESS;
    smb_node_t  *tnode;
    smb_ofile_t *ofile;
    smb_quota_set_t request;
    uint32_t    reply;
    list_t      *quota_list;

    bzero(&request, sizeof (smb_quota_set_t));

    if (!smb_tree_has_feature(sr->tid_tree, SMB_TREE_QUOTA)) {
        smbsr_error(sr, NT_STATUS_NOT_SUPPORTED, 0, 0);
        return (SDRC_ERROR);
    }

    if (!smb_user_is_admin(sr->uid_user)) {
        smbsr_error(sr, NT_STATUS_ACCESS_DENIED, ERRSRV, ERRaccess);
        return (-1);
    }

    if (xa->smb_tpscnt != 2) {
        smbsr_error(sr, NT_STATUS_INVALID_PARAMETER, 0, 0);
        return (SDRC_ERROR);
    }

    if (smb_mbc_decodef(&xa->req_param_mb, "%w", sr,
        &sr->smb_fid)) {
        smbsr_error(sr, NT_STATUS_INVALID_PARAMETER, 0, 0);
        return (SDRC_ERROR);
    }

    smbsr_lookup_file(sr);
    ofile = sr->fid_ofile;
    if (ofile == NULL) {
        smbsr_error(sr, NT_STATUS_INVALID_HANDLE, ERRDOS, ERRbadfid);
        return (SDRC_ERROR);
    }

    if ((ofile->f_node == NULL) || (ofile->f_ftype != SMB_FTYPE_DISK)) {
        smbsr_error(sr, NT_STATUS_ACCESS_DENIED, ERRDOS,
            ERROR_ACCESS_DENIED);
        smbsr_release_file(sr);
        return (SDRC_ERROR);
    }

    tnode = sr->tid_tree->t_snode;
    root_path  = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
    if (smb_node_getmntpath(tnode, root_path, MAXPATHLEN) != 0) {
        smbsr_error(sr, NT_STATUS_INVALID_PARAMETER, ERRDOS,
            ERROR_INVALID_PARAMETER);
        smbsr_release_file(sr);
        kmem_free(root_path, MAXPATHLEN);
        return (SDRC_ERROR);
    }

    quota_list = &request.qs_quota_list;
    list_create(quota_list, sizeof (smb_quota_t),
        offsetof(smb_quota_t, q_list_node));

    status = smb_quota_decode_quotas(xa, quota_list);
    if (status == NT_STATUS_SUCCESS) {
        request.qs_root_path = root_path;
        if (smb_quota_set(sr->sr_server, &request, &reply) != 0) {
            status = NT_STATUS_INTERNAL_ERROR;
        } else {
            status = reply;
            xdr_free(xdr_uint32_t, (char *)&reply);
        }
    }

    kmem_free(root_path, MAXPATHLEN);
    smb_quota_free_quotas(&request.qs_quota_list);
    smbsr_release_file(sr);

    if (status != NT_STATUS_SUCCESS) {
        smbsr_error(sr, status, 0, 0);
        (void) smb_mbc_encodef(&xa->rep_param_mb, "l", 0);
        return (SDRC_ERROR);
    }

    return (SDRC_SUCCESS);
}

/*
 * smb_quota_init_sids
 *
 * If the query is of type SMB_QUOTA_QUERY_SIDLIST or
 * SMB_QUOTA_QUERY_STARTSID decode the list of sids from
 * the client request into request->qq_sid_list.
 * Otherwise (type SMB_QUOTA_QUERY_ALL) find the resume sid
 * and insert it into request->qq_sid_list, or reset the
 * resume sid to NULL if request->qq_restart.
 *
 * Returns: NT_STATUS codes
 */
static uint32_t
smb_quota_init_sids(smb_xa_t *xa, smb_quota_query_t *request,
    smb_ofile_t *ofile)
{
    smb_quota_sid_t *sid;
    list_t *sid_list;
    uint32_t status = NT_STATUS_SUCCESS;

    sid_list = &request->qq_sid_list;
    list_create(sid_list, sizeof (smb_quota_sid_t),
        offsetof(smb_quota_sid_t, qs_list_node));

    switch (request->qq_query_op) {
    case SMB_QUOTA_QUERY_SIDLIST:
    case SMB_QUOTA_QUERY_STARTSID:
        status = smb_quota_decode_sids(xa, sid_list);
        break;
    case SMB_QUOTA_QUERY_ALL:
        if (request->qq_restart)
            smb_ofile_set_quota_resume(ofile, NULL);
        else {
            sid = kmem_zalloc(sizeof (smb_quota_sid_t), KM_SLEEP);
            list_insert_tail(sid_list, sid);
            smb_ofile_get_quota_resume(ofile, sid->qs_sidstr,
                SMB_SID_STRSZ);
            if (*sid->qs_sidstr == '\0')
                status = NT_STATUS_INVALID_PARAMETER;
        }
        break;
    default:
        status = NT_STATUS_INVALID_PARAMETER;
        break;
    }

    return (status);
}

/*
 * smb_quota_free_sids
 */
static void
smb_quota_free_sids(smb_quota_query_t *request)
{
    list_t *sid_list;
    smb_quota_sid_t *sid;

    sid_list = &request->qq_sid_list;

    while ((sid = list_head(sid_list)) != NULL) {
        list_remove(sid_list, sid);
        kmem_free(sid, sizeof (smb_quota_sid_t));
    }

    list_destroy(sid_list);
}

/*
 * smb_quota_decode_sids
 *
 * Decode the SIDs from the data block and stores them in string form in list.
 * Eaxh sid entry comprises:
 *  next_offset (4 bytes) - offset of next entry
 *  sid length (4 bytes)
 *  sid (variable length = sidlen)
 * The last entry will have a next_offset value of 0.
 *
 * Returns NT_STATUS codes.
 */
static uint32_t
smb_quota_decode_sids(smb_xa_t *xa, list_t *list)
{
    uint32_t    offset, mb_offset, sid_offset, bytes_left;
    uint32_t    next_offset, sidlen;
    smb_sid_t   *sid;
    smb_quota_sid_t *qsid;
    uint32_t status = NT_STATUS_SUCCESS;
    struct mbuf_chain sidbuf;

    offset = 0;
    do {
        mb_offset = offset + xa->req_data_mb.chain_offset;
        bytes_left = xa->req_data_mb.max_bytes - mb_offset;
        (void) MBC_SHADOW_CHAIN(&sidbuf, &xa->req_data_mb,
            mb_offset, bytes_left);

        if (smb_mbc_decodef(&sidbuf, "ll", &next_offset, &sidlen)) {
            status = NT_STATUS_INVALID_PARAMETER;
            break;
        }

        sid_offset = offset + (2 * sizeof (uint32_t));
        sid = smb_decode_sid(xa, sid_offset);
        if (sid == NULL) {
            status = NT_STATUS_INVALID_PARAMETER;
            break;
        }

        qsid = kmem_zalloc(sizeof (smb_quota_sid_t), KM_SLEEP);
        smb_sid_tostr(sid, qsid->qs_sidstr);
        smb_sid_free(sid);
        sid = NULL;

        list_insert_tail(list, qsid);
        offset += next_offset;
    } while ((next_offset != 0) && (bytes_left > 0));

    return (status);
}

/*
 * smb_quota_max_quota
 *
 * If the query is if type SMB_QUOTA_QUERY_SIDLIST a quota entry
 * is returned for each sid in the sidlist. request->qr_max_quota
 * is set to 0 and is unused.
 * Otherwise (for SMB_QUOTA_QUERY_STARTSID and SMB_QUOTA_QUERY_ALL)
 * max_quota is the maximum number of quota entries requested from
 * the file system (via door call smb_quota_query()).
 * If single is set max_quota is set to 1. If single is not set
 * max quota is calculated as the number of quotas of size
 * SMB_QUOTA_EST_SIZE that would fit in the response buffer.
 */
static void
smb_quota_max_quota(smb_xa_t *xa, smb_quota_query_t *request)
{
    if (request->qq_query_op == SMB_QUOTA_QUERY_SIDLIST)
        request->qq_max_quota = 0;
    else if (request->qq_single)
        request->qq_max_quota = 1;
    else
        request->qq_max_quota = (xa->smb_mdrcnt / SMB_QUOTA_EST_SIZE);
}

/*
 * smb_quota_decode_quotas
 *
 * Decode the quota entries into a list_t of smb_quota_t.
 * SMB_QUOTA_SIZE_NO_SID is the size of a quota entry,
 * excluding the sid.
 * The last entry will have a next_offset value of 0.
 *
 * Returns NT_STATUS codes.
 */
static uint32_t
smb_quota_decode_quotas(smb_xa_t *xa, list_t *list)
{
    uint32_t    offset, mb_offset, sid_offset, bytes_left;
    uint32_t    next_offset, sidlen;
    uint64_t    mtime;
    smb_sid_t   *sid;
    smb_quota_t *quota;
    uint32_t    status = NT_STATUS_SUCCESS;
    struct mbuf_chain quotabuf;

    offset = 0;
    do {
        mb_offset = offset + xa->req_data_mb.chain_offset;
        bytes_left = xa->req_data_mb.max_bytes - mb_offset;
        (void) MBC_SHADOW_CHAIN(&quotabuf, &xa->req_data_mb,
            mb_offset, bytes_left);

        quota = kmem_zalloc(sizeof (smb_quota_t), KM_SLEEP);

        if (smb_mbc_decodef(&quotabuf, "llqqqq",
            &next_offset, &sidlen, &mtime,
            &quota->q_used, &quota->q_thresh, &quota->q_limit)) {
            kmem_free(quota, sizeof (smb_quota_t));
            status = NT_STATUS_INVALID_PARAMETER;
            break;
        }

        sid_offset = offset + SMB_QUOTA_SIZE_NO_SID;
        sid = smb_decode_sid(xa, sid_offset);
        if (sid == NULL) {
            kmem_free(quota, sizeof (smb_quota_t));
            status = NT_STATUS_INVALID_PARAMETER;
            break;
        }

        bzero(quota->q_sidstr, SMB_SID_STRSZ);
        smb_sid_tostr(sid, quota->q_sidstr);
        smb_sid_free(sid);
        sid = NULL;

        list_insert_tail(list, quota);
        offset += next_offset;
    } while ((next_offset != 0) && (bytes_left > 0));

    return (status);
}

/*
 * smb_quota_free_quotas
 */
static void
smb_quota_free_quotas(list_t *list)
{
    smb_quota_t *quota;

    while ((quota = list_head(list)) != NULL) {
        list_remove(list, quota);
        kmem_free(quota, sizeof (smb_quota_t));
    }

    list_destroy(list);
}

/*
 * smb_quota_encode_quotas
 *
 * Encode the quota entries from a list_t of smb_quota_t.
 * SMB_QUOTA_SIZE_NO_SID is the size of a quota entry,
 * excluding the sid.
 * The last entry will have a next_offset value of 0.
 * Sets the last encoded SID as the resume sid.
 */
static uint32_t
smb_quota_encode_quotas(smb_xa_t *xa, smb_quota_query_t *request,
    smb_quota_response_t *reply, smb_ofile_t *ofile)
{
    uint32_t next_offset, sid_offset, total_bytes;
    uint64_t mtime = 0;
    uint32_t sidlen, pad;
    smb_sid_t *sid;
    char *sidstr = NULL, *resume = NULL;
    smb_quota_t *quota, *next_quota;
    list_t *list = &reply->qr_quota_list;

    int rc;
    uint32_t status = NT_STATUS_SUCCESS;

    total_bytes = 0;
    quota = list_head(list);
    while (quota) {
        next_quota = list_next(list, quota);
        sidstr = quota->q_sidstr;
        if ((sid = smb_sid_fromstr(sidstr)) == NULL) {
            quota = next_quota;
            continue;
        }

        sidlen = smb_sid_len(sid);
        sid_offset = SMB_QUOTA_SIZE_NO_SID;
        next_offset = sid_offset + sidlen;
        pad = smb_pad_align(next_offset, 8);
        next_offset += pad;

        if (!MBC_ROOM_FOR(&xa->rep_data_mb, next_offset)) {
            smb_sid_free(sid);
            break;
        }
        if (!MBC_ROOM_FOR(&xa->rep_data_mb,
            next_offset + SMB_QUOTA_MAX_SIZE)) {
            next_quota = NULL;
        }

        rc = smb_mbc_encodef(&xa->rep_data_mb, "llqqqq",
            next_quota ? next_offset : 0, sidlen, mtime,
            quota->q_used, quota->q_thresh, quota->q_limit);
        if (rc == 0) {
            smb_encode_sid(xa, sid);
            rc = smb_mbc_encodef(&xa->rep_data_mb, "#.", pad);
        }

        smb_sid_free(sid);

        if (rc != 0) {
            status = NT_STATUS_INTERNAL_ERROR;
            break;
        }

        resume = sidstr;
        total_bytes += next_offset;
        quota = next_quota;
    }

    rc = smb_mbc_encodef(&xa->rep_param_mb, "l", total_bytes);

    if ((status == NT_STATUS_SUCCESS) &&
        ((request->qq_query_op == SMB_QUOTA_QUERY_STARTSID) ||
        (request->qq_query_op == SMB_QUOTA_QUERY_ALL))) {
        smb_ofile_set_quota_resume(ofile, resume);
    }

    return (status);
}

/*
 * smb_quota_query_user_quota
 *
 * Get user quota information for a single user (uid)
 * for the current file system.
 * Find the user's sid, insert it in the sidlist of a
 * smb_quota_query_t request and invoke the door call
 * smb_quota_query() to obtain the quota information.
 *
 * Returns: NT_STATUS codes.
 */
uint32_t
smb_quota_query_user_quota(smb_request_t *sr, uid_t uid, smb_quota_t *quota)
{
    smb_sid_t *sid;
    smb_quota_sid_t qsid;
    smb_quota_query_t request;
    smb_quota_response_t reply;
    list_t *sid_list;
    smb_quota_t *q;
    smb_node_t *tnode;
    uint32_t status = NT_STATUS_SUCCESS;

    if (smb_idmap_getsid(uid, SMB_IDMAP_USER, &sid) != IDMAP_SUCCESS)
        return (NT_STATUS_INTERNAL_ERROR);

    smb_sid_tostr(sid, qsid.qs_sidstr);
    smb_sid_free(sid);

    bzero(&request, sizeof (smb_quota_query_t));
    bzero(&reply, sizeof (smb_quota_response_t));

    tnode = sr->tid_tree->t_snode;
    request.qq_root_path = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
    if (smb_node_getmntpath(tnode, request.qq_root_path, MAXPATHLEN) != 0) {
        kmem_free(request.qq_root_path, MAXPATHLEN);
        return (NT_STATUS_INTERNAL_ERROR);
    }

    sid_list = &request.qq_sid_list;
    list_create(sid_list, sizeof (smb_quota_sid_t),
        offsetof(smb_quota_sid_t, qs_list_node));
    list_insert_tail(sid_list, &qsid);

    request.qq_query_op = SMB_QUOTA_QUERY_SIDLIST;
    request.qq_single = B_TRUE;

    if (smb_quota_query(sr->sr_server, &request, &reply) != 0) {
        status = NT_STATUS_INTERNAL_ERROR;
    } else {
        if (reply.qr_status != NT_STATUS_SUCCESS) {
            status = reply.qr_status;
        } else {
            q = list_head(&reply.qr_quota_list);
            if ((q == NULL) ||
                (strcmp(qsid.qs_sidstr, q->q_sidstr) != 0)) {
                /* should never happen */
                status = NT_STATUS_INTERNAL_ERROR;
            } else {
                bcopy(q, quota, sizeof (smb_quota_t));
            }
        }
        xdr_free(smb_quota_response_xdr, (char *)&reply);
    }

    kmem_free(request.qq_root_path, MAXPATHLEN);
    list_remove(sid_list, &qsid);
    list_destroy(sid_list);

    return (status);
}

/*
 * smb_quota_query
 *
 * Door call to query quotas for the provided filesystem path.
 * Returns: -1 - door call (or encode/decode) failure.
 *       0 - success. Status set in reply.
 */
static int
smb_quota_query(smb_server_t *sv, smb_quota_query_t *request,
    smb_quota_response_t *reply)
{
    int rc;

    rc = smb_kdoor_upcall(sv, SMB_DR_QUOTA_QUERY,
        request, smb_quota_query_xdr, reply, smb_quota_response_xdr);

    return (rc);
}

/*
 * smb_quota_set
 *
 * Door call to set quotas for the provided filesystem path.
 * Returns: -1 - door call (or encode/decode) failure.
 *       0 - success. Status set in reply.
 */
static int
smb_quota_set(smb_server_t *sv, smb_quota_set_t *request, uint32_t *reply)
{
    int rc;

    rc = smb_kdoor_upcall(sv, SMB_DR_QUOTA_SET,
        request, smb_quota_set_xdr, reply, xdr_uint32_t);

    return (rc);
}