linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.

 * All Rights Reserved.

 */

#ifndef __XFS_LOG_H__

#define __XFS_LOG_H__

​

struct xfs_log_vec {

    struct xfs_log_vec  *lv_next;   /* next lv in build list */

    int         lv_niovecs; /* number of iovecs in lv */

    struct xfs_log_iovec    *lv_iovecp; /* iovec array */

    struct xfs_log_item *lv_item;   /* owner */

    char            *lv_buf;    /* formatted buffer */

    int         lv_bytes;   /* accounted space in buffer */

    int         lv_buf_len; /* aligned size of buffer */

    int         lv_size;    /* size of allocated lv */

};

​

#define XFS_LOG_VEC_ORDERED (-1)

​

static inline void *

xlog_prepare_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,

        uint type)

{

    struct xfs_log_iovec *vec = *vecp;

​

    if (vec) {

        ASSERT(vec - lv->lv_iovecp < lv->lv_niovecs);

        vec++;

    } else {

        vec = &lv->lv_iovecp[0];

    }

​

    vec->i_type = type;

    vec->i_addr = lv->lv_buf + lv->lv_buf_len;

​

    ASSERT(IS_ALIGNED((unsigned long)vec->i_addr, sizeof(uint64_t)));

​

    *vecp = vec;

    return vec->i_addr;

}

​

/*

 * We need to make sure the next buffer is naturally aligned for the biggest

 * basic data type we put into it.  We already accounted for this padding when

 * sizing the buffer.

 *

 * However, this padding does not get written into the log, and hence we have to

 * track the space used by the log vectors separately to prevent log space hangs

 * due to inaccurate accounting (i.e. a leak) of the used log space through the

 * CIL context ticket.

 */

static inline void

xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec, int len)

{

    lv->lv_buf_len += round_up(len, sizeof(uint64_t));

    lv->lv_bytes += len;

    vec->i_len = len;

}

​

static inline void *

xlog_copy_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,