/* Editor Settings: expandtabs and use 4 spaces for indentation
 * ex: set softtabstop=4 tabstop=8 expandtab shiftwidth=4: *
 * -*- mode: c, c-basic-offset: 4 -*- */

/*
 * Copyright Likewise Software
 * All rights reserved.
 *
 * 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 2 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/>.
 *
 * LIKEWISE SOFTWARE MAKES THIS SOFTWARE AVAILABLE UNDER OTHER LICENSING
 * TERMS AS WELL.  IF YOU HAVE ENTERED INTO A SEPARATE LICENSE AGREEMENT
 * WITH LIKEWISE SOFTWARE, THEN YOU MAY ELECT TO USE THE SOFTWARE UNDER THE
 * TERMS OF THAT SOFTWARE LICENSE AGREEMENT INSTEAD OF THE TERMS OF THE GNU
 * GENERAL PUBLIC LICENSE, NOTWITHSTANDING THE ABOVE NOTICE.  IF YOU
 * HAVE QUESTIONS, OR WISH TO REQUEST A COPY OF THE ALTERNATE LICENSING
 * TERMS OFFERED BY LIKEWISE SOFTWARE, PLEASE CONTACT LIKEWISE SOFTWARE AT
 * license@likewisesoftware.com
 */

/*
 * Copyright (C) Likewise Software. All rights reserved.
 *
 * Module Name:
 *
 *        ccb.c
 *
 * Abstract:
 *
 *        Likewise Posix File System Driver (PVFS)
 *
 *        Context Control Block routineus
 *
 * Authors: Gerald Carter <gcarter@likewise.com>
 *          Krishna Ganugapati <krishnag@likewise.com>
 */

#include "pvfs.h"


/***********************************************************
 **********************************************************/

NTSTATUS
PvfsAllocateCCB(
    PPVFS_CCB *ppCCB
    )
{
    NTSTATUS ntError = STATUS_UNSUCCESSFUL;
    PPVFS_CCB pCCB = NULL;

    *ppCCB = NULL;

    ntError = PvfsAllocateMemory((PVOID*)&pCCB, sizeof(PVFS_CCB));
    BAIL_ON_NT_STATUS(ntError);

    /* Initialize mutexes and refcounts */

    pthread_mutex_init(&pCCB->FileMutex, NULL);
    pthread_mutex_init(&pCCB->ControlBlock, NULL);

    pCCB->bPendingDeleteHandle = FALSE;
    pCCB->bCloseInProgress = FALSE;
    pCCB->OplockState = PVFS_OPLOCK_STATE_NONE;

    /* Add initial ref count */

    pCCB->RefCount = 1;

    *ppCCB = pCCB;

#ifdef _PVFS_DEVELOPER_DEBUG
    InterlockedIncrement(&gPvfsCcbCount);
#endif

    ntError = STATUS_SUCCESS;

cleanup:
    return ntError;

error:
    goto cleanup;
}

/*******************************************************
 ******************************************************/

NTSTATUS
PvfsFreeCCB(
    PPVFS_CCB pCCB
    )
{
    NTSTATUS ntError = STATUS_SUCCESS;

    if (pCCB->pFcb)
    {
        ntError = PvfsRemoveCCBFromFCB(pCCB->pFcb, pCCB);

        PvfsReleaseFCB(&pCCB->pFcb);
    }

    if (pCCB->pDirContext)
    {
        PvfsFreeDirectoryContext(pCCB->pDirContext);
    }

    if (pCCB->pUserToken)
    {
        RtlReleaseAccessToken(&pCCB->pUserToken);
        pCCB->pUserToken = NULL;
    }

    LwRtlCStringFree(&pCCB->pszFilename);

    PVFS_FREE(&pCCB->LockTable.ExclusiveLocks.pLocks);
    PVFS_FREE(&pCCB->LockTable.SharedLocks.pLocks);

    pthread_mutex_destroy(&pCCB->FileMutex);
    pthread_mutex_destroy(&pCCB->ControlBlock);

    PVFS_FREE(&pCCB);

#ifdef _PVFS_DEVELOPER_DEBUG
    InterlockedDecrement(&gPvfsCcbCount);
#endif


    return STATUS_SUCCESS;
}

/*******************************************************
 ******************************************************/

VOID
PvfsReleaseCCB(
    PPVFS_CCB pCCB
    )
{
    if (InterlockedDecrement(&pCCB->RefCount) == 0)
    {
        PvfsFreeCCB(pCCB);
    }

    return;
}

/*******************************************************
 ******************************************************/

PPVFS_CCB
PvfsReferenceCCB(
    PPVFS_CCB pCCB
    )
{
    InterlockedIncrement(&pCCB->RefCount);

    return pCCB;
}


/*******************************************************
 ******************************************************/

static NTSTATUS
PvfsAcquireCCBInternal(
    IO_FILE_HANDLE FileHandle,
    PPVFS_CCB * ppCCB,
    BOOLEAN bIncRef
    )
{
    NTSTATUS ntError = STATUS_SUCCESS;
    PPVFS_CCB pCCB = (PPVFS_CCB)IoFileGetContext(FileHandle);

    PVFS_BAIL_ON_INVALID_CCB(pCCB, ntError);

    if (bIncRef) {
        InterlockedIncrement(&pCCB->RefCount);
    }

    *ppCCB = pCCB;

cleanup:
    return ntError;

error:
    *ppCCB = NULL;

    goto cleanup;

}

/*******************************************************
 ******************************************************/

NTSTATUS
PvfsAcquireCCB(
    IO_FILE_HANDLE FileHandle,
    PPVFS_CCB * ppCCB
    )
{
    return PvfsAcquireCCBInternal(FileHandle, ppCCB, TRUE);
}

/*******************************************************
 ******************************************************/

NTSTATUS
PvfsAcquireCCBClose(
    IO_FILE_HANDLE FileHandle,
    PPVFS_CCB * ppCCB
    )
{
    return PvfsAcquireCCBInternal(FileHandle, ppCCB, FALSE);
}


/*******************************************************
 ******************************************************/

NTSTATUS
PvfsStoreCCB(
    IO_FILE_HANDLE FileHandle,
    PPVFS_CCB pCCB
    )
{
    NTSTATUS ntError = STATUS_SUCCESS;

    ntError = IoFileSetContext(FileHandle, (PVOID)pCCB);
    BAIL_ON_NT_STATUS(ntError);

cleanup:
    return ntError;

error:
    goto cleanup;
}


/********************************************************
 *******************************************************/

NTSTATUS
PvfsSaveFileDeviceInfo(
    PPVFS_CCB pCcb
    )
{
    NTSTATUS ntError = STATUS_UNSUCCESSFUL;
    PVFS_STAT Stat = {0};
    PPVFS_FCB pFcb = pCcb->pFcb;

    ntError = PvfsSysFstat(pCcb->fd, &Stat);
    BAIL_ON_NT_STATUS(ntError);

    pCcb->FileId.Device = Stat.s_dev;
    pCcb->FileId.Inode  = Stat.s_ino;
    pCcb->FileSize = Stat.s_size;

    if ((pFcb->FileId.Device == 0) || (pFcb->FileId.Inode == 0))
    {
        pFcb->FileId = pCcb->FileId;
    }


cleanup:
    return ntError;

error:
    goto cleanup;
}


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*/