// 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_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_rmap_item.h"
#include "xfs_log.h"
#include "xfs_rmap.h"
#include "xfs_error.h"
#include "xfs_log_priv.h"
#include "xfs_log_recover.h"
#include "xfs_ag.h"
#include "xfs_btree.h"
#include "xfs_trace.h"
#include "xfs_rtgroup.h"

struct kmem_cache       *xfs_rui_cache;
struct kmem_cache       *xfs_rud_cache;

static const struct xfs_item_ops xfs_rui_item_ops;

static inline struct xfs_rui_log_item *RUI_ITEM(struct xfs_log_item *lip)
{
        return container_of(lip, struct xfs_rui_log_item, rui_item);
}

STATIC void
xfs_rui_item_free(
        struct xfs_rui_log_item *ruip)
{
        kvfree(ruip->rui_item.li_lv_shadow);
        if (ruip->rui_format.rui_nextents > XFS_RUI_MAX_FAST_EXTENTS)
                kfree(ruip);
        else
                kmem_cache_free(xfs_rui_cache, ruip);
}

/*
 * Freeing the RUI requires that we remove it from the AIL if it has already
 * been placed there. However, the RUI may not yet have been placed in the AIL
 * when called by xfs_rui_release() from RUD 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 RUI.
 */
STATIC void
xfs_rui_release(
        struct xfs_rui_log_item *ruip)
{
        ASSERT(atomic_read(&ruip->rui_refcount) > 0);
        if (!atomic_dec_and_test(&ruip->rui_refcount))
                return;

        xfs_trans_ail_delete(&ruip->rui_item, 0);
        xfs_rui_item_free(ruip);
}

STATIC void
xfs_rui_item_size(
        struct xfs_log_item     *lip,
        int                     *nvecs,
        int                     *nbytes)
{
        struct xfs_rui_log_item *ruip = RUI_ITEM(lip);

        *nvecs += 1;
        *nbytes += xfs_rui_log_format_sizeof(ruip->rui_format.rui_nextents);
}

unsigned int xfs_rui_log_space(unsigned int nr)
{
        return xlog_item_space(1, xfs_rui_log_format_sizeof(nr));
}

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

        ASSERT(atomic_read(&ruip->rui_next_extent) ==
                        ruip->rui_format.rui_nextents);

        ASSERT(lip->li_type == XFS_LI_RUI || lip->li_type == XFS_LI_RUI_RT);

        ruip->rui_format.rui_type = lip->li_type;
        ruip->rui_format.rui_size = 1;

        xlog_format_copy(lfb, XLOG_REG_TYPE_RUI_FORMAT, &ruip->rui_format,
                        xfs_rui_log_format_sizeof(ruip->rui_format.rui_nextents));
}

/*
 * The unpin operation is the last place an RUI 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 RUI transaction has been successfully committed to make it
 * this far. Therefore, we expect whoever committed the RUI to either construct
 * and commit the RUD or drop the RUD's reference in the event of error. Simply
 * drop the log's RUI reference now that the log is done with it.
 */
STATIC void
xfs_rui_item_unpin(
        struct xfs_log_item     *lip,
        int                     remove)
{
        struct xfs_rui_log_item *ruip = RUI_ITEM(lip);

        xfs_rui_release(ruip);
}

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

/*
 * Allocate and initialize an rui item with the given number of extents.
 */
STATIC struct xfs_rui_log_item *
xfs_rui_init(
        struct xfs_mount                *mp,
        unsigned short                  item_type,
        uint                            nextents)

{
        struct xfs_rui_log_item         *ruip;

        ASSERT(nextents > 0);
        ASSERT(item_type == XFS_LI_RUI || item_type == XFS_LI_RUI_RT);

        if (nextents > XFS_RUI_MAX_FAST_EXTENTS)
                ruip = kzalloc(xfs_rui_log_item_sizeof(nextents),
                                GFP_KERNEL | __GFP_NOFAIL);
        else
                ruip = kmem_cache_zalloc(xfs_rui_cache,
                                         GFP_KERNEL | __GFP_NOFAIL);

        xfs_log_item_init(mp, &ruip->rui_item, item_type, &xfs_rui_item_ops);
        ruip->rui_format.rui_nextents = nextents;
        ruip->rui_format.rui_id = (uintptr_t)(void *)ruip;
        atomic_set(&ruip->rui_next_extent, 0);
        atomic_set(&ruip->rui_refcount, 2);

        return ruip;
}

static inline struct xfs_rud_log_item *RUD_ITEM(struct xfs_log_item *lip)
{
        return container_of(lip, struct xfs_rud_log_item, rud_item);
}

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

unsigned int xfs_rud_log_space(void)
{
        return xlog_item_space(1, sizeof(struct xfs_rud_log_format));
}

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

        ASSERT(lip->li_type == XFS_LI_RUD || lip->li_type == XFS_LI_RUD_RT);

        rudp->rud_format.rud_type = lip->li_type;
        rudp->rud_format.rud_size = 1;

        xlog_format_copy(lfb, XLOG_REG_TYPE_RUD_FORMAT, &rudp->rud_format,
                        sizeof(struct xfs_rud_log_format));
}

/*
 * The RUD is either committed or aborted if the transaction is cancelled. If
 * the transaction is cancelled, drop our reference to the RUI and free the
 * RUD.
 */
STATIC void
xfs_rud_item_release(
        struct xfs_log_item     *lip)
{
        struct xfs_rud_log_item *rudp = RUD_ITEM(lip);

        xfs_rui_release(rudp->rud_ruip);
        kvfree(rudp->rud_item.li_lv_shadow);
        kmem_cache_free(xfs_rud_cache, rudp);
}

static struct xfs_log_item *
xfs_rud_item_intent(
        struct xfs_log_item     *lip)
{
        return &RUD_ITEM(lip)->rud_ruip->rui_item;
}

static const struct xfs_item_ops xfs_rud_item_ops = {
        .flags          = XFS_ITEM_RELEASE_WHEN_COMMITTED |
                          XFS_ITEM_INTENT_DONE,
        .iop_size       = xfs_rud_item_size,
        .iop_format     = xfs_rud_item_format,
        .iop_release    = xfs_rud_item_release,
        .iop_intent     = xfs_rud_item_intent,
};

static inline struct xfs_rmap_intent *ri_entry(const struct list_head *e)
{
        return list_entry(e, struct xfs_rmap_intent, ri_list);
}

static inline bool
xfs_rui_item_isrt(const struct xfs_log_item *lip)
{
        ASSERT(lip->li_type == XFS_LI_RUI || lip->li_type == XFS_LI_RUI_RT);

        return lip->li_type == XFS_LI_RUI_RT;
}

/* Sort rmap intents by AG. */
static int
xfs_rmap_update_diff_items(
        void                            *priv,
        const struct list_head          *a,
        const struct list_head          *b)
{
        struct xfs_rmap_intent          *ra = ri_entry(a);
        struct xfs_rmap_intent          *rb = ri_entry(b);

        return ra->ri_group->xg_gno - rb->ri_group->xg_gno;
}

/* Log rmap updates in the intent item. */
STATIC void
xfs_rmap_update_log_item(
        struct xfs_trans                *tp,
        struct xfs_rui_log_item         *ruip,
        struct xfs_rmap_intent          *ri)
{
        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(&ruip->rui_next_extent) - 1;
        ASSERT(next_extent < ruip->rui_format.rui_nextents);
        map = &ruip->rui_format.rui_extents[next_extent];
        map->me_owner = ri->ri_owner;
        map->me_startblock = ri->ri_bmap.br_startblock;
        map->me_startoff = ri->ri_bmap.br_startoff;
        map->me_len = ri->ri_bmap.br_blockcount;

        map->me_flags = 0;
        if (ri->ri_bmap.br_state == XFS_EXT_UNWRITTEN)
                map->me_flags |= XFS_RMAP_EXTENT_UNWRITTEN;
        if (ri->ri_whichfork == XFS_ATTR_FORK)
                map->me_flags |= XFS_RMAP_EXTENT_ATTR_FORK;
        switch (ri->ri_type) {
        case XFS_RMAP_MAP:
                map->me_flags |= XFS_RMAP_EXTENT_MAP;
                break;
        case XFS_RMAP_MAP_SHARED:
                map->me_flags |= XFS_RMAP_EXTENT_MAP_SHARED;
                break;
        case XFS_RMAP_UNMAP:
                map->me_flags |= XFS_RMAP_EXTENT_UNMAP;
                break;
        case XFS_RMAP_UNMAP_SHARED:
                map->me_flags |= XFS_RMAP_EXTENT_UNMAP_SHARED;
                break;
        case XFS_RMAP_CONVERT:
                map->me_flags |= XFS_RMAP_EXTENT_CONVERT;
                break;
        case XFS_RMAP_CONVERT_SHARED:
                map->me_flags |= XFS_RMAP_EXTENT_CONVERT_SHARED;
                break;
        case XFS_RMAP_ALLOC:
                map->me_flags |= XFS_RMAP_EXTENT_ALLOC;
                break;
        case XFS_RMAP_FREE:
                map->me_flags |= XFS_RMAP_EXTENT_FREE;
                break;
        default:
                ASSERT(0);
        }
}

static struct xfs_log_item *
__xfs_rmap_update_create_intent(
        struct xfs_trans                *tp,
        struct list_head                *items,
        unsigned int                    count,
        bool                            sort,
        unsigned short                  item_type)
{
        struct xfs_mount                *mp = tp->t_mountp;
        struct xfs_rui_log_item         *ruip;
        struct xfs_rmap_intent          *ri;

        ASSERT(count > 0);

        ruip = xfs_rui_init(mp, item_type, count);
        if (sort)
                list_sort(mp, items, xfs_rmap_update_diff_items);
        list_for_each_entry(ri, items, ri_list)
                xfs_rmap_update_log_item(tp, ruip, ri);
        return &ruip->rui_item;
}

static struct xfs_log_item *
xfs_rmap_update_create_intent(
        struct xfs_trans                *tp,
        struct list_head                *items,
        unsigned int                    count,
        bool                            sort)
{
        return __xfs_rmap_update_create_intent(tp, items, count, sort,
                        XFS_LI_RUI);
}

static inline unsigned short
xfs_rud_type_from_rui(const struct xfs_rui_log_item *ruip)
{
        return xfs_rui_item_isrt(&ruip->rui_item) ? XFS_LI_RUD_RT : XFS_LI_RUD;
}

/* Get an RUD so we can process all the deferred rmap updates. */
static struct xfs_log_item *
xfs_rmap_update_create_done(
        struct xfs_trans                *tp,
        struct xfs_log_item             *intent,
        unsigned int                    count)
{
        struct xfs_rui_log_item         *ruip = RUI_ITEM(intent);
        struct xfs_rud_log_item         *rudp;

        rudp = kmem_cache_zalloc(xfs_rud_cache, GFP_KERNEL | __GFP_NOFAIL);
        xfs_log_item_init(tp->t_mountp, &rudp->rud_item,
                        xfs_rud_type_from_rui(ruip), &xfs_rud_item_ops);
        rudp->rud_ruip = ruip;
        rudp->rud_format.rud_rui_id = ruip->rui_format.rui_id;

        return &rudp->rud_item;
}

/* Add this deferred RUI to the transaction. */
void
xfs_rmap_defer_add(
        struct xfs_trans        *tp,
        struct xfs_rmap_intent  *ri)
{
        struct xfs_mount        *mp = tp->t_mountp;

        /*
         * Deferred rmap updates for the realtime and data sections must use
         * separate transactions to finish deferred work because updates to
         * realtime metadata files can lock AGFs to allocate btree blocks and
         * we don't want that mixing with the AGF locks taken to finish data
         * section updates.
         */
        ri->ri_group = xfs_group_intent_get(mp, ri->ri_bmap.br_startblock,
                        ri->ri_realtime ? XG_TYPE_RTG : XG_TYPE_AG);

        trace_xfs_rmap_defer(mp, ri);
        xfs_defer_add(tp, &ri->ri_list, ri->ri_realtime ?
                        &xfs_rtrmap_update_defer_type :
                        &xfs_rmap_update_defer_type);
}

/* Cancel a deferred rmap update. */
STATIC void
xfs_rmap_update_cancel_item(
        struct list_head                *item)
{
        struct xfs_rmap_intent          *ri = ri_entry(item);

        xfs_group_intent_put(ri->ri_group);
        kmem_cache_free(xfs_rmap_intent_cache, ri);
}

/* Process a deferred rmap update. */
STATIC int
xfs_rmap_update_finish_item(
        struct xfs_trans                *tp,
        struct xfs_log_item             *done,
        struct list_head                *item,
        struct xfs_btree_cur            **state)
{
        struct xfs_rmap_intent          *ri = ri_entry(item);
        int                             error;

        error = xfs_rmap_finish_one(tp, ri, state);

        xfs_rmap_update_cancel_item(item);
        return error;
}

/* Clean up after calling xfs_rmap_finish_one. */
STATIC void
xfs_rmap_finish_one_cleanup(
        struct xfs_trans        *tp,
        struct xfs_btree_cur    *rcur,
        int                     error)
{
        struct xfs_buf          *agbp = NULL;

        if (rcur == NULL)
                return;
        agbp = rcur->bc_ag.agbp;
        xfs_btree_del_cursor(rcur, error);
        if (error && agbp)
                xfs_trans_brelse(tp, agbp);
}

/* Abort all pending RUIs. */
STATIC void
xfs_rmap_update_abort_intent(
        struct xfs_log_item     *intent)
{
        xfs_rui_release(RUI_ITEM(intent));
}

/* Is this recovered RUI ok? */
static inline bool
xfs_rui_validate_map(
        struct xfs_mount                *mp,
        bool                            isrt,
        struct xfs_map_extent           *map)
{
        if (!xfs_has_rmapbt(mp))
                return false;

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

        switch (map->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) {
        case XFS_RMAP_EXTENT_MAP:
        case XFS_RMAP_EXTENT_MAP_SHARED:
        case XFS_RMAP_EXTENT_UNMAP:
        case XFS_RMAP_EXTENT_UNMAP_SHARED:
        case XFS_RMAP_EXTENT_CONVERT:
        case XFS_RMAP_EXTENT_CONVERT_SHARED:
        case XFS_RMAP_EXTENT_ALLOC:
        case XFS_RMAP_EXTENT_FREE:
                break;
        default:
                return false;
        }

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

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

        if (isrt)
                return xfs_verify_rtbext(mp, map->me_startblock, map->me_len);

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

static inline void
xfs_rui_recover_work(
        struct xfs_mount                *mp,
        struct xfs_defer_pending        *dfp,
        bool                            isrt,
        const struct xfs_map_extent     *map)
{
        struct xfs_rmap_intent          *ri;

        ri = kmem_cache_alloc(xfs_rmap_intent_cache, GFP_KERNEL | __GFP_NOFAIL);

        switch (map->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) {
        case XFS_RMAP_EXTENT_MAP:
                ri->ri_type = XFS_RMAP_MAP;
                break;
        case XFS_RMAP_EXTENT_MAP_SHARED:
                ri->ri_type = XFS_RMAP_MAP_SHARED;
                break;
        case XFS_RMAP_EXTENT_UNMAP:
                ri->ri_type = XFS_RMAP_UNMAP;
                break;
        case XFS_RMAP_EXTENT_UNMAP_SHARED:
                ri->ri_type = XFS_RMAP_UNMAP_SHARED;
                break;
        case XFS_RMAP_EXTENT_CONVERT:
                ri->ri_type = XFS_RMAP_CONVERT;
                break;
        case XFS_RMAP_EXTENT_CONVERT_SHARED:
                ri->ri_type = XFS_RMAP_CONVERT_SHARED;
                break;
        case XFS_RMAP_EXTENT_ALLOC:
                ri->ri_type = XFS_RMAP_ALLOC;
                break;
        case XFS_RMAP_EXTENT_FREE:
                ri->ri_type = XFS_RMAP_FREE;
                break;
        default:
                ASSERT(0);
                return;
        }

        ri->ri_owner = map->me_owner;
        ri->ri_whichfork = (map->me_flags & XFS_RMAP_EXTENT_ATTR_FORK) ?
                        XFS_ATTR_FORK : XFS_DATA_FORK;
        ri->ri_bmap.br_startblock = map->me_startblock;
        ri->ri_bmap.br_startoff = map->me_startoff;
        ri->ri_bmap.br_blockcount = map->me_len;
        ri->ri_bmap.br_state = (map->me_flags & XFS_RMAP_EXTENT_UNWRITTEN) ?
                        XFS_EXT_UNWRITTEN : XFS_EXT_NORM;
        ri->ri_group = xfs_group_intent_get(mp, map->me_startblock,
                        isrt ? XG_TYPE_RTG : XG_TYPE_AG);
        ri->ri_realtime = isrt;

        xfs_defer_add_item(dfp, &ri->ri_list);
}

/*
 * Process an rmap update intent item that was recovered from the log.
 * We need to update the rmapbt.
 */
STATIC int
xfs_rmap_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_rui_log_item         *ruip = RUI_ITEM(lip);
        struct xfs_trans                *tp;
        struct xfs_mount                *mp = lip->li_log->l_mp;
        bool                            isrt = xfs_rui_item_isrt(lip);
        int                             i;
        int                             error = 0;

        /*
         * First check the validity of the extents described by the
         * RUI.  If any are bad, then assume that all are bad and
         * just toss the RUI.
         */
        for (i = 0; i < ruip->rui_format.rui_nextents; i++) {
                if (!xfs_rui_validate_map(mp, isrt,
                                        &ruip->rui_format.rui_extents[i])) {
                        XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
                                        &ruip->rui_format,
                                        sizeof(ruip->rui_format));
                        return -EFSCORRUPTED;
                }

                xfs_rui_recover_work(mp, dfp, isrt,
                                &ruip->rui_format.rui_extents[i]);
        }

        resv = xlog_recover_resv(&M_RES(mp)->tr_itruncate);
        error = xfs_trans_alloc(mp, &resv, mp->m_rmap_maxlevels, 0,
                        XFS_TRANS_RESERVE, &tp);
        if (error)
                return error;

        error = xlog_recover_finish_intent(tp, dfp);
        if (error == -EFSCORRUPTED)
                XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
                                &ruip->rui_format,
                                sizeof(ruip->rui_format));
        if (error)
                goto abort_error;

        return xfs_defer_ops_capture_and_commit(tp, capture_list);

abort_error:
        xfs_trans_cancel(tp);
        return error;
}

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

        ASSERT(intent->li_type == XFS_LI_RUI ||
               intent->li_type == XFS_LI_RUI_RT);

        count = RUI_ITEM(intent)->rui_format.rui_nextents;
        map = RUI_ITEM(intent)->rui_format.rui_extents;

        ruip = xfs_rui_init(tp->t_mountp, intent->li_type, count);
        memcpy(ruip->rui_format.rui_extents, map, count * sizeof(*map));
        atomic_set(&ruip->rui_next_extent, count);

        return &ruip->rui_item;
}

const struct xfs_defer_op_type xfs_rmap_update_defer_type = {
        .name           = "rmap",
        .max_items      = XFS_RUI_MAX_FAST_EXTENTS,
        .create_intent  = xfs_rmap_update_create_intent,
        .abort_intent   = xfs_rmap_update_abort_intent,
        .create_done    = xfs_rmap_update_create_done,
        .finish_item    = xfs_rmap_update_finish_item,
        .finish_cleanup = xfs_rmap_finish_one_cleanup,
        .cancel_item    = xfs_rmap_update_cancel_item,
        .recover_work   = xfs_rmap_recover_work,
        .relog_intent   = xfs_rmap_relog_intent,
};

#ifdef CONFIG_XFS_RT
static struct xfs_log_item *
xfs_rtrmap_update_create_intent(
        struct xfs_trans                *tp,
        struct list_head                *items,
        unsigned int                    count,
        bool                            sort)
{
        return __xfs_rmap_update_create_intent(tp, items, count, sort,
                        XFS_LI_RUI_RT);
}

/* Clean up after calling xfs_rmap_finish_one. */
STATIC void
xfs_rtrmap_finish_one_cleanup(
        struct xfs_trans        *tp,
        struct xfs_btree_cur    *rcur,
        int                     error)
{
        if (rcur)
                xfs_btree_del_cursor(rcur, error);
}

const struct xfs_defer_op_type xfs_rtrmap_update_defer_type = {
        .name           = "rtrmap",
        .max_items      = XFS_RUI_MAX_FAST_EXTENTS,
        .create_intent  = xfs_rtrmap_update_create_intent,
        .abort_intent   = xfs_rmap_update_abort_intent,
        .create_done    = xfs_rmap_update_create_done,
        .finish_item    = xfs_rmap_update_finish_item,
        .finish_cleanup = xfs_rtrmap_finish_one_cleanup,
        .cancel_item    = xfs_rmap_update_cancel_item,
        .recover_work   = xfs_rmap_recover_work,
        .relog_intent   = xfs_rmap_relog_intent,
};
#else
const struct xfs_defer_op_type xfs_rtrmap_update_defer_type = {
        .name           = "rtrmap",
};
#endif

STATIC bool
xfs_rui_item_match(
        struct xfs_log_item     *lip,
        uint64_t                intent_id)
{
        return RUI_ITEM(lip)->rui_format.rui_id == intent_id;
}

static const struct xfs_item_ops xfs_rui_item_ops = {
        .flags          = XFS_ITEM_INTENT,
        .iop_size       = xfs_rui_item_size,
        .iop_format     = xfs_rui_item_format,
        .iop_unpin      = xfs_rui_item_unpin,
        .iop_release    = xfs_rui_item_release,
        .iop_match      = xfs_rui_item_match,
};

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

        memcpy(dst, src, offsetof(struct xfs_rui_log_format, rui_extents));

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

/*
 * This routine is called to create an in-core extent rmap update
 * item from the rui format structure which was logged on disk.
 * It allocates an in-core rui, copies the extents from the format
 * structure into it, and adds the rui to the AIL with the given
 * LSN.
 */
STATIC int
xlog_recover_rui_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_rui_log_item         *ruip;
        struct xfs_rui_log_format       *rui_formatp;
        size_t                          len;

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

        if (item->ri_buf[0].iov_len < xfs_rui_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;
        }

        len = xfs_rui_log_format_sizeof(rui_formatp->rui_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;
        }

        ruip = xfs_rui_init(mp, ITEM_TYPE(item), rui_formatp->rui_nextents);
        xfs_rui_copy_format(&ruip->rui_format, rui_formatp);
        atomic_set(&ruip->rui_next_extent, rui_formatp->rui_nextents);

        xlog_recover_intent_item(log, &ruip->rui_item, lsn,
                        &xfs_rmap_update_defer_type);
        return 0;
}

const struct xlog_recover_item_ops xlog_rui_item_ops = {
        .item_type              = XFS_LI_RUI,
        .commit_pass2           = xlog_recover_rui_commit_pass2,
};

#ifdef CONFIG_XFS_RT
STATIC int
xlog_recover_rtrui_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_rui_log_item         *ruip;
        struct xfs_rui_log_format       *rui_formatp;
        size_t                          len;

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

        if (item->ri_buf[0].iov_len < xfs_rui_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;
        }

        len = xfs_rui_log_format_sizeof(rui_formatp->rui_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;
        }

        ruip = xfs_rui_init(mp, ITEM_TYPE(item), rui_formatp->rui_nextents);
        xfs_rui_copy_format(&ruip->rui_format, rui_formatp);
        atomic_set(&ruip->rui_next_extent, rui_formatp->rui_nextents);

        xlog_recover_intent_item(log, &ruip->rui_item, lsn,
                        &xfs_rtrmap_update_defer_type);
        return 0;
}
#else
STATIC int
xlog_recover_rtrui_commit_pass2(
        struct xlog                     *log,
        struct list_head                *buffer_list,
        struct xlog_recover_item        *item,
        xfs_lsn_t                       lsn)
{
        XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, log->l_mp,
                        item->ri_buf[0].iov_base, item->ri_buf[0].iov_len);
        return -EFSCORRUPTED;
}
#endif

const struct xlog_recover_item_ops xlog_rtrui_item_ops = {
        .item_type              = XFS_LI_RUI_RT,
        .commit_pass2           = xlog_recover_rtrui_commit_pass2,
};

/*
 * This routine is called when an RUD format structure is found in a committed
 * transaction in the log. Its purpose is to cancel the corresponding RUI if it
 * was still in the log. To do this it searches the AIL for the RUI with an id
 * equal to that in the RUD format structure. If we find it we drop the RUD
 * reference, which removes the RUI from the AIL and frees it.
 */
STATIC int
xlog_recover_rud_commit_pass2(
        struct xlog                     *log,
        struct list_head                *buffer_list,
        struct xlog_recover_item        *item,
        xfs_lsn_t                       lsn)
{
        struct xfs_rud_log_format       *rud_formatp;

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

        xlog_recover_release_intent(log, XFS_LI_RUI, rud_formatp->rud_rui_id);
        return 0;
}

const struct xlog_recover_item_ops xlog_rud_item_ops = {
        .item_type              = XFS_LI_RUD,
        .commit_pass2           = xlog_recover_rud_commit_pass2,
};

#ifdef CONFIG_XFS_RT
STATIC int
xlog_recover_rtrud_commit_pass2(
        struct xlog                     *log,
        struct list_head                *buffer_list,
        struct xlog_recover_item        *item,
        xfs_lsn_t                       lsn)
{
        struct xfs_rud_log_format       *rud_formatp;

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

        xlog_recover_release_intent(log, XFS_LI_RUI_RT,
                        rud_formatp->rud_rui_id);
        return 0;
}
#else
# define xlog_recover_rtrud_commit_pass2        xlog_recover_rtrui_commit_pass2
#endif

const struct xlog_recover_item_ops xlog_rtrud_item_ops = {
        .item_type              = XFS_LI_RUD_RT,
        .commit_pass2           = xlog_recover_rtrud_commit_pass2,
};