// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2016 Oracle.  All Rights Reserved.
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 */
#include "xfs_platform.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_shared.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_bmap_item.h"
#include "xfs_log.h"
#include "xfs_bmap.h"
#include "xfs_icache.h"
#include "xfs_bmap_btree.h"
#include "xfs_trans_space.h"
#include "xfs_error.h"
#include "xfs_log_priv.h"
#include "xfs_log_recover.h"
#include "xfs_ag.h"
#include "xfs_trace.h"

struct kmem_cache       *xfs_bui_cache;
struct kmem_cache       *xfs_bud_cache;

static const struct xfs_item_ops xfs_bui_item_ops;

static inline struct xfs_bui_log_item *BUI_ITEM(struct xfs_log_item *lip)
{
        return container_of(lip, struct xfs_bui_log_item, bui_item);
}

STATIC void
xfs_bui_item_free(
        struct xfs_bui_log_item *buip)
{
        kvfree(buip->bui_item.li_lv_shadow);
        kmem_cache_free(xfs_bui_cache, buip);
}

/*
 * Freeing the BUI requires that we remove it from the AIL if it has already
 * been placed there. However, the BUI may not yet have been placed in the AIL
 * when called by xfs_bui_release() from BUD processing due to the ordering of
 * committed vs unpin operations in bulk insert operations. Hence the reference
 * count to ensure only the last caller frees the BUI.
 */
STATIC void
xfs_bui_release(
        struct xfs_bui_log_item *buip)
{
        ASSERT(atomic_read(&buip->bui_refcount) > 0);
        if (!atomic_dec_and_test(&buip->bui_refcount))
                return;

        xfs_trans_ail_delete(&buip->bui_item, 0);
        xfs_bui_item_free(buip);
}


STATIC void
xfs_bui_item_size(
        struct xfs_log_item     *lip,
        int                     *nvecs,
        int                     *nbytes)
{
        struct xfs_bui_log_item *buip = BUI_ITEM(lip);

        *nvecs += 1;
        *nbytes += xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents);
}

unsigned int xfs_bui_log_space(unsigned int nr)
{
        return xlog_item_space(1, xfs_bui_log_format_sizeof(nr));
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given bui log item. We use only 1 iovec, and we point that
 * at the bui_log_format structure embedded in the bui item.
 * It is at this point that we assert that all of the extent
 * slots in the bui item have been filled.
 */
STATIC void
xfs_bui_item_format(
        struct xfs_log_item     *lip,
        struct xlog_format_buf  *lfb)
{
        struct xfs_bui_log_item *buip = BUI_ITEM(lip);

        ASSERT(atomic_read(&buip->bui_next_extent) ==
                        buip->bui_format.bui_nextents);

        buip->bui_format.bui_type = XFS_LI_BUI;
        buip->bui_format.bui_size = 1;

        xlog_format_copy(lfb, XLOG_REG_TYPE_BUI_FORMAT, &buip->bui_format,
                        xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents));
}

/*
 * The unpin operation is the last place an BUI is manipulated in the log. It is
 * either inserted in the AIL or aborted in the event of a log I/O error. In
 * either case, the BUI transaction has been successfully committed to make it
 * this far. Therefore, we expect whoever committed the BUI to either construct
 * and commit the BUD or drop the BUD's reference in the event of error. Simply
 * drop the log's BUI reference now that the log is done with it.
 */
STATIC void
xfs_bui_item_unpin(
        struct xfs_log_item     *lip,
        int                     remove)
{
        struct xfs_bui_log_item *buip = BUI_ITEM(lip);

        xfs_bui_release(buip);
}

/*
 * The BUI has been either committed or aborted if the transaction has been
 * cancelled. If the transaction was cancelled, an BUD isn't going to be
 * constructed and thus we free the BUI here directly.
 */
STATIC void
xfs_bui_item_release(
        struct xfs_log_item     *lip)
{
        xfs_bui_release(BUI_ITEM(lip));
}

/*
 * Allocate and initialize an bui item with the given number of extents.
 */
STATIC struct xfs_bui_log_item *
xfs_bui_init(
        struct xfs_mount                *mp)

{
        struct xfs_bui_log_item         *buip;

        buip = kmem_cache_zalloc(xfs_bui_cache, GFP_KERNEL | __GFP_NOFAIL);

        xfs_log_item_init(mp, &buip->bui_item, XFS_LI_BUI, &xfs_bui_item_ops);
        buip->bui_format.bui_nextents = XFS_BUI_MAX_FAST_EXTENTS;
        buip->bui_format.bui_id = (uintptr_t)(void *)buip;
        atomic_set(&buip->bui_next_extent, 0);
        atomic_set(&buip->bui_refcount, 2);

        return buip;
}

static inline struct xfs_bud_log_item *BUD_ITEM(struct xfs_log_item *lip)
{
        return container_of(lip, struct xfs_bud_log_item, bud_item);
}

STATIC void
xfs_bud_item_size(
        struct xfs_log_item     *lip,
        int                     *nvecs,
        int                     *nbytes)
{
        *nvecs += 1;
        *nbytes += sizeof(struct xfs_bud_log_format);
}

unsigned int xfs_bud_log_space(void)
{
        return xlog_item_space(1, sizeof(struct xfs_bud_log_format));
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given bud log item. We use only 1 iovec, and we point that
 * at the bud_log_format structure embedded in the bud item.
 * It is at this point that we assert that all of the extent
 * slots in the bud item have been filled.
 */
STATIC void
xfs_bud_item_format(
        struct xfs_log_item     *lip,
        struct xlog_format_buf  *lfb)
{
        struct xfs_bud_log_item *budp = BUD_ITEM(lip);

        budp->bud_format.bud_type = XFS_LI_BUD;
        budp->bud_format.bud_size = 1;

        xlog_format_copy(lfb, XLOG_REG_TYPE_BUD_FORMAT, &budp->bud_format,
                        sizeof(struct xfs_bud_log_format));
}

/*
 * The BUD is either committed or aborted if the transaction is cancelled. If
 * the transaction is cancelled, drop our reference to the BUI and free the
 * BUD.
 */
STATIC void
xfs_bud_item_release(
        struct xfs_log_item     *lip)
{
        struct xfs_bud_log_item *budp = BUD_ITEM(lip);

        xfs_bui_release(budp->bud_buip);
        kvfree(budp->bud_item.li_lv_shadow);
        kmem_cache_free(xfs_bud_cache, budp);
}

static struct xfs_log_item *
xfs_bud_item_intent(
        struct xfs_log_item     *lip)
{
        return &BUD_ITEM(lip)->bud_buip->bui_item;
}

static const struct xfs_item_ops xfs_bud_item_ops = {
        .flags          = XFS_ITEM_RELEASE_WHEN_COMMITTED |
                          XFS_ITEM_INTENT_DONE,
        .iop_size       = xfs_bud_item_size,
        .iop_format     = xfs_bud_item_format,
        .iop_release    = xfs_bud_item_release,
        .iop_intent     = xfs_bud_item_intent,
};

static inline struct xfs_bmap_intent *bi_entry(const struct list_head *e)
{
        return list_entry(e, struct xfs_bmap_intent, bi_list);
}

/* Sort bmap intents by inode. */
static int
xfs_bmap_update_diff_items(
        void                            *priv,
        const struct list_head          *a,
        const struct list_head          *b)
{
        struct xfs_bmap_intent          *ba = bi_entry(a);
        struct xfs_bmap_intent          *bb = bi_entry(b);

        return cmp_int(ba->bi_owner->i_ino, bb->bi_owner->i_ino);
}

/* Log bmap updates in the intent item. */
STATIC void
xfs_bmap_update_log_item(
        struct xfs_trans                *tp,
        struct xfs_bui_log_item         *buip,
        struct xfs_bmap_intent          *bi)
{
        uint                            next_extent;
        struct xfs_map_extent           *map;

        /*
         * atomic_inc_return gives us the value after the increment;
         * we want to use it as an array index so we need to subtract 1 from
         * it.
         */
        next_extent = atomic_inc_return(&buip->bui_next_extent) - 1;
        ASSERT(next_extent < buip->bui_format.bui_nextents);
        map = &buip->bui_format.bui_extents[next_extent];
        map->me_owner = bi->bi_owner->i_ino;
        map->me_startblock = bi->bi_bmap.br_startblock;
        map->me_startoff = bi->bi_bmap.br_startoff;
        map->me_len = bi->bi_bmap.br_blockcount;

        switch (bi->bi_type) {
        case XFS_BMAP_MAP:
        case XFS_BMAP_UNMAP:
                map->me_flags = bi->bi_type;
                break;
        default:
                ASSERT(0);
        }
        if (bi->bi_bmap.br_state == XFS_EXT_UNWRITTEN)
                map->me_flags |= XFS_BMAP_EXTENT_UNWRITTEN;
        if (bi->bi_whichfork == XFS_ATTR_FORK)
                map->me_flags |= XFS_BMAP_EXTENT_ATTR_FORK;
        if (xfs_ifork_is_realtime(bi->bi_owner, bi->bi_whichfork))
                map->me_flags |= XFS_BMAP_EXTENT_REALTIME;
}

static struct xfs_log_item *
xfs_bmap_update_create_intent(
        struct xfs_trans                *tp,
        struct list_head                *items,
        unsigned int                    count,
        bool                            sort)
{
        struct xfs_mount                *mp = tp->t_mountp;
        struct xfs_bui_log_item         *buip = xfs_bui_init(mp);
        struct xfs_bmap_intent          *bi;

        ASSERT(count == XFS_BUI_MAX_FAST_EXTENTS);

        if (sort)
                list_sort(mp, items, xfs_bmap_update_diff_items);
        list_for_each_entry(bi, items, bi_list)
                xfs_bmap_update_log_item(tp, buip, bi);
        return &buip->bui_item;
}

/* Get an BUD so we can process all the deferred bmap updates. */
static struct xfs_log_item *
xfs_bmap_update_create_done(
        struct xfs_trans                *tp,
        struct xfs_log_item             *intent,
        unsigned int                    count)
{
        struct xfs_bui_log_item         *buip = BUI_ITEM(intent);
        struct xfs_bud_log_item         *budp;

        budp = kmem_cache_zalloc(xfs_bud_cache, GFP_KERNEL | __GFP_NOFAIL);
        xfs_log_item_init(tp->t_mountp, &budp->bud_item, XFS_LI_BUD,
                          &xfs_bud_item_ops);
        budp->bud_buip = buip;
        budp->bud_format.bud_bui_id = buip->bui_format.bui_id;

        return &budp->bud_item;
}

/* Take a passive ref to the group containing the space we're mapping. */
static inline void
xfs_bmap_update_get_group(
        struct xfs_mount        *mp,
        struct xfs_bmap_intent  *bi)
{
        enum xfs_group_type     type = XG_TYPE_AG;

        if (xfs_ifork_is_realtime(bi->bi_owner, bi->bi_whichfork))
                type = XG_TYPE_RTG;

        /*
         * Bump the intent count on behalf of the deferred rmap and refcount
         * intent items that that we can queue when we finish this bmap work.
         * This new intent item will bump the intent count before the bmap
         * intent drops the intent count, ensuring that the intent count
         * remains nonzero across the transaction roll.
         */
        bi->bi_group = xfs_group_intent_get(mp, bi->bi_bmap.br_startblock,
                                type);
}

/* Add this deferred BUI to the transaction. */
void
xfs_bmap_defer_add(
        struct xfs_trans        *tp,
        struct xfs_bmap_intent  *bi)
{
        xfs_bmap_update_get_group(tp->t_mountp, bi);

        /*
         * Ensure the deferred mapping is pre-recorded in i_delayed_blks.
         *
         * Otherwise stat can report zero blocks for an inode that actually has
         * data when the entire mapping is in the process of being overwritten
         * using the out of place write path. This is undone in xfs_bmapi_remap
         * after it has incremented di_nblocks for a successful operation.
         */
        if (bi->bi_type == XFS_BMAP_MAP)
                bi->bi_owner->i_delayed_blks += bi->bi_bmap.br_blockcount;

        trace_xfs_bmap_defer(bi);
        xfs_defer_add(tp, &bi->bi_list, &xfs_bmap_update_defer_type);
}

/* Cancel a deferred bmap update. */
STATIC void
xfs_bmap_update_cancel_item(
        struct list_head                *item)
{
        struct xfs_bmap_intent          *bi = bi_entry(item);

        if (bi->bi_type == XFS_BMAP_MAP)
                bi->bi_owner->i_delayed_blks -= bi->bi_bmap.br_blockcount;

        xfs_group_intent_put(bi->bi_group);
        kmem_cache_free(xfs_bmap_intent_cache, bi);
}

/* Process a deferred bmap update. */
STATIC int
xfs_bmap_update_finish_item(
        struct xfs_trans                *tp,
        struct xfs_log_item             *done,
        struct list_head                *item,
        struct xfs_btree_cur            **state)
{
        struct xfs_bmap_intent          *bi = bi_entry(item);
        int                             error;

        error = xfs_bmap_finish_one(tp, bi);
        if (!error && bi->bi_bmap.br_blockcount > 0) {
                ASSERT(bi->bi_type == XFS_BMAP_UNMAP);
                return -EAGAIN;
        }

        xfs_bmap_update_cancel_item(item);
        return error;
}

/* Abort all pending BUIs. */
STATIC void
xfs_bmap_update_abort_intent(
        struct xfs_log_item             *intent)
{
        xfs_bui_release(BUI_ITEM(intent));
}

/* Is this recovered BUI ok? */
static inline bool
xfs_bui_validate(
        struct xfs_mount                *mp,
        struct xfs_bui_log_item         *buip)
{
        struct xfs_map_extent           *map;

        /* Only one mapping operation per BUI... */
        if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS)
                return false;

        map = &buip->bui_format.bui_extents[0];

        if (map->me_flags & ~XFS_BMAP_EXTENT_FLAGS)
                return false;

        switch (map->me_flags & XFS_BMAP_EXTENT_TYPE_MASK) {
        case XFS_BMAP_MAP:
        case XFS_BMAP_UNMAP:
                break;
        default:
                return false;
        }

        if (!xfs_verify_ino(mp, map->me_owner))
                return false;

        if (!xfs_verify_fileext(mp, map->me_startoff, map->me_len))
                return false;

        if (map->me_flags & XFS_BMAP_EXTENT_REALTIME)
                return xfs_verify_rtbext(mp, map->me_startblock, map->me_len);

        return xfs_verify_fsbext(mp, map->me_startblock, map->me_len);
}

static inline struct xfs_bmap_intent *
xfs_bui_recover_work(
        struct xfs_mount                *mp,
        struct xfs_defer_pending        *dfp,
        struct xfs_inode                **ipp,
        struct xfs_map_extent           *map)
{
        struct xfs_bmap_intent          *bi;
        int                             error;

        error = xlog_recover_iget(mp, map->me_owner, ipp);
        if (error)
                return ERR_PTR(error);

        bi = kmem_cache_zalloc(xfs_bmap_intent_cache,
                        GFP_KERNEL | __GFP_NOFAIL);
        bi->bi_whichfork = (map->me_flags & XFS_BMAP_EXTENT_ATTR_FORK) ?
                        XFS_ATTR_FORK : XFS_DATA_FORK;
        bi->bi_type = map->me_flags & XFS_BMAP_EXTENT_TYPE_MASK;
        bi->bi_bmap.br_startblock = map->me_startblock;
        bi->bi_bmap.br_startoff = map->me_startoff;
        bi->bi_bmap.br_blockcount = map->me_len;
        bi->bi_bmap.br_state = (map->me_flags & XFS_BMAP_EXTENT_UNWRITTEN) ?
                        XFS_EXT_UNWRITTEN : XFS_EXT_NORM;
        bi->bi_owner = *ipp;
        xfs_bmap_update_get_group(mp, bi);

        /* see xfs_bmap_defer_add for details */
        if (bi->bi_type == XFS_BMAP_MAP)
                bi->bi_owner->i_delayed_blks += bi->bi_bmap.br_blockcount;
        xfs_defer_add_item(dfp, &bi->bi_list);
        return bi;
}

/*
 * Process a bmap update intent item that was recovered from the log.
 * We need to update some inode's bmbt.
 */
STATIC int
xfs_bmap_recover_work(
        struct xfs_defer_pending        *dfp,
        struct list_head                *capture_list)
{
        struct xfs_trans_res            resv;
        struct xfs_log_item             *lip = dfp->dfp_intent;
        struct xfs_bui_log_item         *buip = BUI_ITEM(lip);
        struct xfs_trans                *tp;
        struct xfs_inode                *ip = NULL;
        struct xfs_mount                *mp = lip->li_log->l_mp;
        struct xfs_map_extent           *map;
        struct xfs_bmap_intent          *work;
        int                             iext_delta;
        int                             error = 0;

        if (!xfs_bui_validate(mp, buip)) {
                XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
                                &buip->bui_format, sizeof(buip->bui_format));
                return -EFSCORRUPTED;
        }

        map = &buip->bui_format.bui_extents[0];
        work = xfs_bui_recover_work(mp, dfp, &ip, map);
        if (IS_ERR(work))
                return PTR_ERR(work);

        /* Allocate transaction and do the work. */
        resv = xlog_recover_resv(&M_RES(mp)->tr_itruncate);
        error = xfs_trans_alloc(mp, &resv,
                        XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), 0, 0, &tp);
        if (error)
                goto err_rele;

        xfs_ilock(ip, XFS_ILOCK_EXCL);
        xfs_trans_ijoin(tp, ip, 0);

        if (!!(map->me_flags & XFS_BMAP_EXTENT_REALTIME) !=
            xfs_ifork_is_realtime(ip, work->bi_whichfork)) {
                error = -EFSCORRUPTED;
                goto err_cancel;
        }

        if (work->bi_type == XFS_BMAP_MAP)
                iext_delta = XFS_IEXT_ADD_NOSPLIT_CNT;
        else
                iext_delta = XFS_IEXT_PUNCH_HOLE_CNT;

        error = xfs_iext_count_extend(tp, ip, work->bi_whichfork, iext_delta);
        if (error)
                goto err_cancel;

        error = xlog_recover_finish_intent(tp, dfp);
        if (error == -EFSCORRUPTED)
                XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
                                &buip->bui_format, sizeof(buip->bui_format));
        if (error)
                goto err_cancel;

        /*
         * Commit transaction, which frees the transaction and saves the inode
         * for later replay activities.
         */
        error = xfs_defer_ops_capture_and_commit(tp, capture_list);
        if (error)
                goto err_unlock;

        xfs_iunlock(ip, XFS_ILOCK_EXCL);
        xfs_irele(ip);
        return 0;

err_cancel:
        xfs_trans_cancel(tp);
err_unlock:
        xfs_iunlock(ip, XFS_ILOCK_EXCL);
err_rele:
        xfs_irele(ip);
        return error;
}

/* Relog an intent item to push the log tail forward. */
static struct xfs_log_item *
xfs_bmap_relog_intent(
        struct xfs_trans                *tp,
        struct xfs_log_item             *intent,
        struct xfs_log_item             *done_item)
{
        struct xfs_bui_log_item         *buip;
        struct xfs_map_extent           *map;
        unsigned int                    count;

        count = BUI_ITEM(intent)->bui_format.bui_nextents;
        map = BUI_ITEM(intent)->bui_format.bui_extents;

        buip = xfs_bui_init(tp->t_mountp);
        memcpy(buip->bui_format.bui_extents, map, count * sizeof(*map));
        atomic_set(&buip->bui_next_extent, count);

        return &buip->bui_item;
}

const struct xfs_defer_op_type xfs_bmap_update_defer_type = {
        .name           = "bmap",
        .max_items      = XFS_BUI_MAX_FAST_EXTENTS,
        .create_intent  = xfs_bmap_update_create_intent,
        .abort_intent   = xfs_bmap_update_abort_intent,
        .create_done    = xfs_bmap_update_create_done,
        .finish_item    = xfs_bmap_update_finish_item,
        .cancel_item    = xfs_bmap_update_cancel_item,
        .recover_work   = xfs_bmap_recover_work,
        .relog_intent   = xfs_bmap_relog_intent,
};

STATIC bool
xfs_bui_item_match(
        struct xfs_log_item     *lip,
        uint64_t                intent_id)
{
        return BUI_ITEM(lip)->bui_format.bui_id == intent_id;
}

static const struct xfs_item_ops xfs_bui_item_ops = {
        .flags          = XFS_ITEM_INTENT,
        .iop_size       = xfs_bui_item_size,
        .iop_format     = xfs_bui_item_format,
        .iop_unpin      = xfs_bui_item_unpin,
        .iop_release    = xfs_bui_item_release,
        .iop_match      = xfs_bui_item_match,
};

static inline void
xfs_bui_copy_format(
        struct xfs_bui_log_format       *dst,
        const struct xfs_bui_log_format *src)
{
        unsigned int                    i;

        memcpy(dst, src, offsetof(struct xfs_bui_log_format, bui_extents));

        for (i = 0; i < src->bui_nextents; i++)
                memcpy(&dst->bui_extents[i], &src->bui_extents[i],
                                sizeof(struct xfs_map_extent));
}

/*
 * This routine is called to create an in-core extent bmap update
 * item from the bui format structure which was logged on disk.
 * It allocates an in-core bui, copies the extents from the format
 * structure into it, and adds the bui to the AIL with the given
 * LSN.
 */
STATIC int
xlog_recover_bui_commit_pass2(
        struct xlog                     *log,
        struct list_head                *buffer_list,
        struct xlog_recover_item        *item,
        xfs_lsn_t                       lsn)
{
        struct xfs_mount                *mp = log->l_mp;
        struct xfs_bui_log_item         *buip;
        struct xfs_bui_log_format       *bui_formatp;
        size_t                          len;

        bui_formatp = item->ri_buf[0].iov_base;

        if (item->ri_buf[0].iov_len < xfs_bui_log_format_sizeof(0)) {
                XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
                                item->ri_buf[0].iov_base, item->ri_buf[0].iov_len);
                return -EFSCORRUPTED;
        }

        if (bui_formatp->bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) {
                XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
                                item->ri_buf[0].iov_base, item->ri_buf[0].iov_len);
                return -EFSCORRUPTED;
        }

        len = xfs_bui_log_format_sizeof(bui_formatp->bui_nextents);
        if (item->ri_buf[0].iov_len != len) {
                XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
                                item->ri_buf[0].iov_base, item->ri_buf[0].iov_len);
                return -EFSCORRUPTED;
        }

        buip = xfs_bui_init(mp);
        xfs_bui_copy_format(&buip->bui_format, bui_formatp);
        atomic_set(&buip->bui_next_extent, bui_formatp->bui_nextents);

        xlog_recover_intent_item(log, &buip->bui_item, lsn,
                        &xfs_bmap_update_defer_type);
        return 0;
}

const struct xlog_recover_item_ops xlog_bui_item_ops = {
        .item_type              = XFS_LI_BUI,
        .commit_pass2           = xlog_recover_bui_commit_pass2,
};

/*
 * This routine is called when an BUD format structure is found in a committed
 * transaction in the log. Its purpose is to cancel the corresponding BUI if it
 * was still in the log. To do this it searches the AIL for the BUI with an id
 * equal to that in the BUD format structure. If we find it we drop the BUD
 * reference, which removes the BUI from the AIL and frees it.
 */
STATIC int
xlog_recover_bud_commit_pass2(
        struct xlog                     *log,
        struct list_head                *buffer_list,
        struct xlog_recover_item        *item,
        xfs_lsn_t                       lsn)
{
        struct xfs_bud_log_format       *bud_formatp;

        bud_formatp = item->ri_buf[0].iov_base;
        if (item->ri_buf[0].iov_len != sizeof(struct xfs_bud_log_format)) {
                XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, log->l_mp,
                                item->ri_buf[0].iov_base, item->ri_buf[0].iov_len);
                return -EFSCORRUPTED;
        }

        xlog_recover_release_intent(log, XFS_LI_BUI, bud_formatp->bud_bui_id);
        return 0;
}

const struct xlog_recover_item_ops xlog_bud_item_ops = {
        .item_type              = XFS_LI_BUD,
        .commit_pass2           = xlog_recover_bud_commit_pass2,
};