249 lines
6 KiB
C
249 lines
6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_defer.h"
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#include "xfs_trans.h"
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#include "xfs_trans_priv.h"
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#include "xfs_refcount_item.h"
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#include "xfs_alloc.h"
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#include "xfs_refcount.h"
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/*
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* This routine is called to allocate a "refcount update done"
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* log item.
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*/
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struct xfs_cud_log_item *
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xfs_trans_get_cud(
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struct xfs_trans *tp,
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struct xfs_cui_log_item *cuip)
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{
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struct xfs_cud_log_item *cudp;
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cudp = xfs_cud_init(tp->t_mountp, cuip);
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xfs_trans_add_item(tp, &cudp->cud_item);
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return cudp;
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}
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/*
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* Finish an refcount update and log it to the CUD. Note that the
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* transaction is marked dirty regardless of whether the refcount
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* update succeeds or fails to support the CUI/CUD lifecycle rules.
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*/
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int
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xfs_trans_log_finish_refcount_update(
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struct xfs_trans *tp,
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struct xfs_cud_log_item *cudp,
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enum xfs_refcount_intent_type type,
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xfs_fsblock_t startblock,
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xfs_extlen_t blockcount,
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xfs_fsblock_t *new_fsb,
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xfs_extlen_t *new_len,
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struct xfs_btree_cur **pcur)
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{
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int error;
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error = xfs_refcount_finish_one(tp, type, startblock,
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blockcount, new_fsb, new_len, pcur);
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/*
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* Mark the transaction dirty, even on error. This ensures the
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* transaction is aborted, which:
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*
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* 1.) releases the CUI and frees the CUD
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* 2.) shuts down the filesystem
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*/
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tp->t_flags |= XFS_TRANS_DIRTY;
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set_bit(XFS_LI_DIRTY, &cudp->cud_item.li_flags);
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return error;
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}
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/* Sort refcount intents by AG. */
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static int
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xfs_refcount_update_diff_items(
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void *priv,
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struct list_head *a,
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struct list_head *b)
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{
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struct xfs_mount *mp = priv;
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struct xfs_refcount_intent *ra;
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struct xfs_refcount_intent *rb;
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ra = container_of(a, struct xfs_refcount_intent, ri_list);
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rb = container_of(b, struct xfs_refcount_intent, ri_list);
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return XFS_FSB_TO_AGNO(mp, ra->ri_startblock) -
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XFS_FSB_TO_AGNO(mp, rb->ri_startblock);
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}
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/* Get an CUI. */
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STATIC void *
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xfs_refcount_update_create_intent(
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struct xfs_trans *tp,
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unsigned int count)
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{
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struct xfs_cui_log_item *cuip;
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ASSERT(tp != NULL);
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ASSERT(count > 0);
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cuip = xfs_cui_init(tp->t_mountp, count);
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ASSERT(cuip != NULL);
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/*
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* Get a log_item_desc to point at the new item.
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*/
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xfs_trans_add_item(tp, &cuip->cui_item);
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return cuip;
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}
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/* Set the phys extent flags for this reverse mapping. */
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static void
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xfs_trans_set_refcount_flags(
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struct xfs_phys_extent *refc,
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enum xfs_refcount_intent_type type)
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{
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refc->pe_flags = 0;
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switch (type) {
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case XFS_REFCOUNT_INCREASE:
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case XFS_REFCOUNT_DECREASE:
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case XFS_REFCOUNT_ALLOC_COW:
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case XFS_REFCOUNT_FREE_COW:
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refc->pe_flags |= type;
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break;
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default:
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ASSERT(0);
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}
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}
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/* Log refcount updates in the intent item. */
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STATIC void
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xfs_refcount_update_log_item(
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struct xfs_trans *tp,
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void *intent,
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struct list_head *item)
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{
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struct xfs_cui_log_item *cuip = intent;
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struct xfs_refcount_intent *refc;
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uint next_extent;
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struct xfs_phys_extent *ext;
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refc = container_of(item, struct xfs_refcount_intent, ri_list);
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tp->t_flags |= XFS_TRANS_DIRTY;
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set_bit(XFS_LI_DIRTY, &cuip->cui_item.li_flags);
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/*
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* atomic_inc_return gives us the value after the increment;
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* we want to use it as an array index so we need to subtract 1 from
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* it.
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*/
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next_extent = atomic_inc_return(&cuip->cui_next_extent) - 1;
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ASSERT(next_extent < cuip->cui_format.cui_nextents);
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ext = &cuip->cui_format.cui_extents[next_extent];
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ext->pe_startblock = refc->ri_startblock;
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ext->pe_len = refc->ri_blockcount;
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xfs_trans_set_refcount_flags(ext, refc->ri_type);
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}
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/* Get an CUD so we can process all the deferred refcount updates. */
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STATIC void *
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xfs_refcount_update_create_done(
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struct xfs_trans *tp,
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void *intent,
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unsigned int count)
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{
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return xfs_trans_get_cud(tp, intent);
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}
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/* Process a deferred refcount update. */
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STATIC int
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xfs_refcount_update_finish_item(
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struct xfs_trans *tp,
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struct list_head *item,
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void *done_item,
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void **state)
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{
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struct xfs_refcount_intent *refc;
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xfs_fsblock_t new_fsb;
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xfs_extlen_t new_aglen;
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int error;
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refc = container_of(item, struct xfs_refcount_intent, ri_list);
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error = xfs_trans_log_finish_refcount_update(tp, done_item,
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refc->ri_type,
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refc->ri_startblock,
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refc->ri_blockcount,
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&new_fsb, &new_aglen,
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(struct xfs_btree_cur **)state);
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/* Did we run out of reservation? Requeue what we didn't finish. */
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if (!error && new_aglen > 0) {
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ASSERT(refc->ri_type == XFS_REFCOUNT_INCREASE ||
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refc->ri_type == XFS_REFCOUNT_DECREASE);
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refc->ri_startblock = new_fsb;
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refc->ri_blockcount = new_aglen;
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return -EAGAIN;
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}
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kmem_free(refc);
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return error;
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}
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/* Clean up after processing deferred refcounts. */
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STATIC void
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xfs_refcount_update_finish_cleanup(
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struct xfs_trans *tp,
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void *state,
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int error)
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{
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struct xfs_btree_cur *rcur = state;
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xfs_refcount_finish_one_cleanup(tp, rcur, error);
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}
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/* Abort all pending CUIs. */
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STATIC void
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xfs_refcount_update_abort_intent(
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void *intent)
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{
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xfs_cui_release(intent);
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}
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/* Cancel a deferred refcount update. */
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STATIC void
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xfs_refcount_update_cancel_item(
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struct list_head *item)
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{
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struct xfs_refcount_intent *refc;
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refc = container_of(item, struct xfs_refcount_intent, ri_list);
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kmem_free(refc);
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}
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static const struct xfs_defer_op_type xfs_refcount_update_defer_type = {
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.type = XFS_DEFER_OPS_TYPE_REFCOUNT,
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.max_items = XFS_CUI_MAX_FAST_EXTENTS,
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.diff_items = xfs_refcount_update_diff_items,
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.create_intent = xfs_refcount_update_create_intent,
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.abort_intent = xfs_refcount_update_abort_intent,
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.log_item = xfs_refcount_update_log_item,
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.create_done = xfs_refcount_update_create_done,
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.finish_item = xfs_refcount_update_finish_item,
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.finish_cleanup = xfs_refcount_update_finish_cleanup,
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.cancel_item = xfs_refcount_update_cancel_item,
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};
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/* Register the deferred op type. */
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void
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xfs_refcount_update_init_defer_op(void)
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{
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xfs_defer_init_op_type(&xfs_refcount_update_defer_type);
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}
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