arm64: kgdb: Fix single-step exception handling oops

[linux/fpc-iii.git] / fs / xfs / xfs_refcount_item.c

/*
 * Copyright (C) 2016 Oracle.  All Rights Reserved.
 *
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 *
 * 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 would 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, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
 */
#include "xfs.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_mount.h"
#include "xfs_defer.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_buf_item.h"
#include "xfs_refcount_item.h"
#include "xfs_log.h"
#include "xfs_refcount.h"


kmem_zone_t     *xfs_cui_zone;
kmem_zone_t     *xfs_cud_zone;

static inline struct xfs_cui_log_item *CUI_ITEM(struct xfs_log_item *lip)
{
        return container_of(lip, struct xfs_cui_log_item, cui_item);
}

void
xfs_cui_item_free(
        struct xfs_cui_log_item *cuip)
{
        if (cuip->cui_format.cui_nextents > XFS_CUI_MAX_FAST_EXTENTS)
                kmem_free(cuip);
        else
                kmem_zone_free(xfs_cui_zone, cuip);
}

STATIC void
xfs_cui_item_size(
        struct xfs_log_item     *lip,
        int                     *nvecs,
        int                     *nbytes)
{
        struct xfs_cui_log_item *cuip = CUI_ITEM(lip);

        *nvecs += 1;
        *nbytes += xfs_cui_log_format_sizeof(cuip->cui_format.cui_nextents);
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given cui log item. We use only 1 iovec, and we point that
 * at the cui_log_format structure embedded in the cui item.
 * It is at this point that we assert that all of the extent
 * slots in the cui item have been filled.
 */
STATIC void
xfs_cui_item_format(
        struct xfs_log_item     *lip,
        struct xfs_log_vec      *lv)
{
        struct xfs_cui_log_item *cuip = CUI_ITEM(lip);
        struct xfs_log_iovec    *vecp = NULL;

        ASSERT(atomic_read(&cuip->cui_next_extent) ==
                        cuip->cui_format.cui_nextents);

        cuip->cui_format.cui_type = XFS_LI_CUI;
        cuip->cui_format.cui_size = 1;

        xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_CUI_FORMAT, &cuip->cui_format,
                        xfs_cui_log_format_sizeof(cuip->cui_format.cui_nextents));
}

/*
 * Pinning has no meaning for an cui item, so just return.
 */
STATIC void
xfs_cui_item_pin(
        struct xfs_log_item     *lip)
{
}

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

        xfs_cui_release(cuip);
}

/*
 * CUI items have no locking or pushing.  However, since CUIs are pulled from
 * the AIL when their corresponding CUDs are committed to disk, their situation
 * is very similar to being pinned.  Return XFS_ITEM_PINNED so that the caller
 * will eventually flush the log.  This should help in getting the CUI out of
 * the AIL.
 */
STATIC uint
xfs_cui_item_push(
        struct xfs_log_item     *lip,
        struct list_head        *buffer_list)
{
        return XFS_ITEM_PINNED;
}

/*
 * The CUI has been either committed or aborted if the transaction has been
 * cancelled. If the transaction was cancelled, an CUD isn't going to be
 * constructed and thus we free the CUI here directly.
 */
STATIC void
xfs_cui_item_unlock(
        struct xfs_log_item     *lip)
{
        if (lip->li_flags & XFS_LI_ABORTED)
                xfs_cui_item_free(CUI_ITEM(lip));
}

/*
 * The CUI is logged only once and cannot be moved in the log, so simply return
 * the lsn at which it's been logged.
 */
STATIC xfs_lsn_t
xfs_cui_item_committed(
        struct xfs_log_item     *lip,
        xfs_lsn_t               lsn)
{
        return lsn;
}

/*
 * The CUI dependency tracking op doesn't do squat.  It can't because
 * it doesn't know where the free extent is coming from.  The dependency
 * tracking has to be handled by the "enclosing" metadata object.  For
 * example, for inodes, the inode is locked throughout the extent freeing
 * so the dependency should be recorded there.
 */
STATIC void
xfs_cui_item_committing(
        struct xfs_log_item     *lip,
        xfs_lsn_t               lsn)
{
}

/*
 * This is the ops vector shared by all cui log items.
 */
static const struct xfs_item_ops xfs_cui_item_ops = {
        .iop_size       = xfs_cui_item_size,
        .iop_format     = xfs_cui_item_format,
        .iop_pin        = xfs_cui_item_pin,
        .iop_unpin      = xfs_cui_item_unpin,
        .iop_unlock     = xfs_cui_item_unlock,
        .iop_committed  = xfs_cui_item_committed,
        .iop_push       = xfs_cui_item_push,
        .iop_committing = xfs_cui_item_committing,
};

/*
 * Allocate and initialize an cui item with the given number of extents.
 */
struct xfs_cui_log_item *
xfs_cui_init(
        struct xfs_mount                *mp,
        uint                            nextents)

{
        struct xfs_cui_log_item         *cuip;

        ASSERT(nextents > 0);
        if (nextents > XFS_CUI_MAX_FAST_EXTENTS)
                cuip = kmem_zalloc(xfs_cui_log_item_sizeof(nextents),
                                KM_SLEEP);
        else
                cuip = kmem_zone_zalloc(xfs_cui_zone, KM_SLEEP);

        xfs_log_item_init(mp, &cuip->cui_item, XFS_LI_CUI, &xfs_cui_item_ops);
        cuip->cui_format.cui_nextents = nextents;
        cuip->cui_format.cui_id = (uintptr_t)(void *)cuip;
        atomic_set(&cuip->cui_next_extent, 0);
        atomic_set(&cuip->cui_refcount, 2);

        return cuip;
}

/*
 * Freeing the CUI requires that we remove it from the AIL if it has already
 * been placed there. However, the CUI may not yet have been placed in the AIL
 * when called by xfs_cui_release() from CUD 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 CUI.
 */
void
xfs_cui_release(
        struct xfs_cui_log_item *cuip)
{
        if (atomic_dec_and_test(&cuip->cui_refcount)) {
                xfs_trans_ail_remove(&cuip->cui_item, SHUTDOWN_LOG_IO_ERROR);
                xfs_cui_item_free(cuip);
        }
}

static inline struct xfs_cud_log_item *CUD_ITEM(struct xfs_log_item *lip)
{
        return container_of(lip, struct xfs_cud_log_item, cud_item);
}

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

/*
 * This is called to fill in the vector of log iovecs for the
 * given cud log item. We use only 1 iovec, and we point that
 * at the cud_log_format structure embedded in the cud item.
 * It is at this point that we assert that all of the extent
 * slots in the cud item have been filled.
 */
STATIC void
xfs_cud_item_format(
        struct xfs_log_item     *lip,
        struct xfs_log_vec      *lv)
{
        struct xfs_cud_log_item *cudp = CUD_ITEM(lip);
        struct xfs_log_iovec    *vecp = NULL;

        cudp->cud_format.cud_type = XFS_LI_CUD;
        cudp->cud_format.cud_size = 1;

        xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_CUD_FORMAT, &cudp->cud_format,
                        sizeof(struct xfs_cud_log_format));
}

/*
 * Pinning has no meaning for an cud item, so just return.
 */
STATIC void
xfs_cud_item_pin(
        struct xfs_log_item     *lip)
{
}

/*
 * Since pinning has no meaning for an cud item, unpinning does
 * not either.
 */
STATIC void
xfs_cud_item_unpin(
        struct xfs_log_item     *lip,
        int                     remove)
{
}

/*
 * There isn't much you can do to push on an cud item.  It is simply stuck
 * waiting for the log to be flushed to disk.
 */
STATIC uint
xfs_cud_item_push(
        struct xfs_log_item     *lip,
        struct list_head        *buffer_list)
{
        return XFS_ITEM_PINNED;
}

/*
 * The CUD is either committed or aborted if the transaction is cancelled. If
 * the transaction is cancelled, drop our reference to the CUI and free the
 * CUD.
 */
STATIC void
xfs_cud_item_unlock(
        struct xfs_log_item     *lip)
{
        struct xfs_cud_log_item *cudp = CUD_ITEM(lip);

        if (lip->li_flags & XFS_LI_ABORTED) {
                xfs_cui_release(cudp->cud_cuip);
                kmem_zone_free(xfs_cud_zone, cudp);
        }
}

/*
 * When the cud item is committed to disk, all we need to do is delete our
 * reference to our partner cui item and then free ourselves. Since we're
 * freeing ourselves we must return -1 to keep the transaction code from
 * further referencing this item.
 */
STATIC xfs_lsn_t
xfs_cud_item_committed(
        struct xfs_log_item     *lip,
        xfs_lsn_t               lsn)
{
        struct xfs_cud_log_item *cudp = CUD_ITEM(lip);

        /*
         * Drop the CUI reference regardless of whether the CUD has been
         * aborted. Once the CUD transaction is constructed, it is the sole
         * responsibility of the CUD to release the CUI (even if the CUI is
         * aborted due to log I/O error).
         */
        xfs_cui_release(cudp->cud_cuip);
        kmem_zone_free(xfs_cud_zone, cudp);

        return (xfs_lsn_t)-1;
}

/*
 * The CUD dependency tracking op doesn't do squat.  It can't because
 * it doesn't know where the free extent is coming from.  The dependency
 * tracking has to be handled by the "enclosing" metadata object.  For
 * example, for inodes, the inode is locked throughout the extent freeing
 * so the dependency should be recorded there.
 */
STATIC void
xfs_cud_item_committing(
        struct xfs_log_item     *lip,
        xfs_lsn_t               lsn)
{
}

/*
 * This is the ops vector shared by all cud log items.
 */
static const struct xfs_item_ops xfs_cud_item_ops = {
        .iop_size       = xfs_cud_item_size,
        .iop_format     = xfs_cud_item_format,
        .iop_pin        = xfs_cud_item_pin,
        .iop_unpin      = xfs_cud_item_unpin,
        .iop_unlock     = xfs_cud_item_unlock,
        .iop_committed  = xfs_cud_item_committed,
        .iop_push       = xfs_cud_item_push,
        .iop_committing = xfs_cud_item_committing,
};

/*
 * Allocate and initialize an cud item with the given number of extents.
 */
struct xfs_cud_log_item *
xfs_cud_init(
        struct xfs_mount                *mp,
        struct xfs_cui_log_item         *cuip)

{
        struct xfs_cud_log_item *cudp;

        cudp = kmem_zone_zalloc(xfs_cud_zone, KM_SLEEP);
        xfs_log_item_init(mp, &cudp->cud_item, XFS_LI_CUD, &xfs_cud_item_ops);
        cudp->cud_cuip = cuip;
        cudp->cud_format.cud_cui_id = cuip->cui_format.cui_id;

        return cudp;
}

/*
 * Process a refcount update intent item that was recovered from the log.
 * We need to update the refcountbt.
 */
int
xfs_cui_recover(
        struct xfs_mount                *mp,
        struct xfs_cui_log_item         *cuip)
{
        int                             i;
        int                             error = 0;
        unsigned int                    refc_type;
        struct xfs_phys_extent          *refc;
        xfs_fsblock_t                   startblock_fsb;
        bool                            op_ok;
        struct xfs_cud_log_item         *cudp;
        struct xfs_trans                *tp;
        struct xfs_btree_cur            *rcur = NULL;
        enum xfs_refcount_intent_type   type;
        xfs_fsblock_t                   firstfsb;
        xfs_fsblock_t                   new_fsb;
        xfs_extlen_t                    new_len;
        struct xfs_bmbt_irec            irec;
        struct xfs_defer_ops            dfops;
        bool                            requeue_only = false;

        ASSERT(!test_bit(XFS_CUI_RECOVERED, &cuip->cui_flags));

        /*
         * First check the validity of the extents described by the
         * CUI.  If any are bad, then assume that all are bad and
         * just toss the CUI.
         */
        for (i = 0; i < cuip->cui_format.cui_nextents; i++) {
                refc = &cuip->cui_format.cui_extents[i];
                startblock_fsb = XFS_BB_TO_FSB(mp,
                                   XFS_FSB_TO_DADDR(mp, refc->pe_startblock));
                switch (refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK) {
                case XFS_REFCOUNT_INCREASE:
                case XFS_REFCOUNT_DECREASE:
                case XFS_REFCOUNT_ALLOC_COW:
                case XFS_REFCOUNT_FREE_COW:
                        op_ok = true;
                        break;
                default:
                        op_ok = false;
                        break;
                }
                if (!op_ok || startblock_fsb == 0 ||
                    refc->pe_len == 0 ||
                    startblock_fsb >= mp->m_sb.sb_dblocks ||
                    refc->pe_len >= mp->m_sb.sb_agblocks ||
                    (refc->pe_flags & ~XFS_REFCOUNT_EXTENT_FLAGS)) {
                        /*
                         * This will pull the CUI from the AIL and
                         * free the memory associated with it.
                         */
                        set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags);
                        xfs_cui_release(cuip);
                        return -EIO;
                }
        }

        /*
         * Under normal operation, refcount updates are deferred, so we
         * wouldn't be adding them directly to a transaction.  All
         * refcount updates manage reservation usage internally and
         * dynamically by deferring work that won't fit in the
         * transaction.  Normally, any work that needs to be deferred
         * gets attached to the same defer_ops that scheduled the
         * refcount update.  However, we're in log recovery here, so we
         * we create our own defer_ops and use that to finish up any
         * work that doesn't fit.
         */
        error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
        if (error)
                return error;
        cudp = xfs_trans_get_cud(tp, cuip);

        xfs_defer_init(&dfops, &firstfsb);
        for (i = 0; i < cuip->cui_format.cui_nextents; i++) {
                refc = &cuip->cui_format.cui_extents[i];
                refc_type = refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK;
                switch (refc_type) {
                case XFS_REFCOUNT_INCREASE:
                case XFS_REFCOUNT_DECREASE:
                case XFS_REFCOUNT_ALLOC_COW:
                case XFS_REFCOUNT_FREE_COW:
                        type = refc_type;
                        break;
                default:
                        error = -EFSCORRUPTED;
                        goto abort_error;
                }
                if (requeue_only) {
                        new_fsb = refc->pe_startblock;
                        new_len = refc->pe_len;
                } else
                        error = xfs_trans_log_finish_refcount_update(tp, cudp,
                                &dfops, type, refc->pe_startblock, refc->pe_len,
                                &new_fsb, &new_len, &rcur);
                if (error)
                        goto abort_error;

                /* Requeue what we didn't finish. */
                if (new_len > 0) {
                        irec.br_startblock = new_fsb;
                        irec.br_blockcount = new_len;
                        switch (type) {
                        case XFS_REFCOUNT_INCREASE:
                                error = xfs_refcount_increase_extent(
                                                tp->t_mountp, &dfops, &irec);
                                break;
                        case XFS_REFCOUNT_DECREASE:
                                error = xfs_refcount_decrease_extent(
                                                tp->t_mountp, &dfops, &irec);
                                break;
                        case XFS_REFCOUNT_ALLOC_COW:
                                error = xfs_refcount_alloc_cow_extent(
                                                tp->t_mountp, &dfops,
                                                irec.br_startblock,
                                                irec.br_blockcount);
                                break;
                        case XFS_REFCOUNT_FREE_COW:
                                error = xfs_refcount_free_cow_extent(
                                                tp->t_mountp, &dfops,
                                                irec.br_startblock,
                                                irec.br_blockcount);
                                break;
                        default:
                                ASSERT(0);
                        }
                        if (error)
                                goto abort_error;
                        requeue_only = true;
                }
        }

        xfs_refcount_finish_one_cleanup(tp, rcur, error);
        error = xfs_defer_finish(&tp, &dfops, NULL);
        if (error)
                goto abort_defer;
        set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags);
        error = xfs_trans_commit(tp);
        return error;

abort_error:
        xfs_refcount_finish_one_cleanup(tp, rcur, error);
abort_defer:
        xfs_defer_cancel(&dfops);
        xfs_trans_cancel(tp);
        return error;
}