460 lines
12 KiB
C
460 lines
12 KiB
C
/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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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_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_trans.h"
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#include "xfs_trans_priv.h"
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#include "xfs_buf_item.h"
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#include "xfs_rmap_item.h"
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#include "xfs_log.h"
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kmem_zone_t *xfs_rui_zone;
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kmem_zone_t *xfs_rud_zone;
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static inline struct xfs_rui_log_item *RUI_ITEM(struct xfs_log_item *lip)
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{
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return container_of(lip, struct xfs_rui_log_item, rui_item);
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}
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void
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xfs_rui_item_free(
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struct xfs_rui_log_item *ruip)
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{
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if (ruip->rui_format.rui_nextents > XFS_RUI_MAX_FAST_EXTENTS)
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kmem_free(ruip);
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else
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kmem_zone_free(xfs_rui_zone, ruip);
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}
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/*
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* This returns the number of iovecs needed to log the given rui item.
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* We only need 1 iovec for an rui item. It just logs the rui_log_format
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* structure.
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*/
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static inline int
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xfs_rui_item_sizeof(
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struct xfs_rui_log_item *ruip)
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{
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return sizeof(struct xfs_rui_log_format) +
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(ruip->rui_format.rui_nextents - 1) *
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sizeof(struct xfs_map_extent);
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}
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STATIC void
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xfs_rui_item_size(
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struct xfs_log_item *lip,
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int *nvecs,
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int *nbytes)
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{
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*nvecs += 1;
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*nbytes += xfs_rui_item_sizeof(RUI_ITEM(lip));
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}
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/*
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* This is called to fill in the vector of log iovecs for the
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* given rui log item. We use only 1 iovec, and we point that
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* at the rui_log_format structure embedded in the rui item.
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* It is at this point that we assert that all of the extent
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* slots in the rui item have been filled.
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*/
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STATIC void
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xfs_rui_item_format(
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struct xfs_log_item *lip,
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struct xfs_log_vec *lv)
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{
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struct xfs_rui_log_item *ruip = RUI_ITEM(lip);
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struct xfs_log_iovec *vecp = NULL;
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ASSERT(atomic_read(&ruip->rui_next_extent) ==
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ruip->rui_format.rui_nextents);
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ruip->rui_format.rui_type = XFS_LI_RUI;
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ruip->rui_format.rui_size = 1;
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xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_RUI_FORMAT, &ruip->rui_format,
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xfs_rui_item_sizeof(ruip));
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}
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/*
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* Pinning has no meaning for an rui item, so just return.
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*/
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STATIC void
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xfs_rui_item_pin(
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struct xfs_log_item *lip)
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{
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}
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/*
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* The unpin operation is the last place an RUI is manipulated in the log. It is
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* either inserted in the AIL or aborted in the event of a log I/O error. In
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* either case, the RUI transaction has been successfully committed to make it
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* this far. Therefore, we expect whoever committed the RUI to either construct
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* and commit the RUD or drop the RUD's reference in the event of error. Simply
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* drop the log's RUI reference now that the log is done with it.
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*/
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STATIC void
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xfs_rui_item_unpin(
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struct xfs_log_item *lip,
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int remove)
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{
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struct xfs_rui_log_item *ruip = RUI_ITEM(lip);
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xfs_rui_release(ruip);
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}
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/*
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* RUI items have no locking or pushing. However, since RUIs are pulled from
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* the AIL when their corresponding RUDs are committed to disk, their situation
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* is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller
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* will eventually flush the log. This should help in getting the RUI out of
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* the AIL.
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*/
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STATIC uint
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xfs_rui_item_push(
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struct xfs_log_item *lip,
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struct list_head *buffer_list)
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{
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return XFS_ITEM_PINNED;
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}
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/*
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* The RUI has been either committed or aborted if the transaction has been
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* cancelled. If the transaction was cancelled, an RUD isn't going to be
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* constructed and thus we free the RUI here directly.
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*/
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STATIC void
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xfs_rui_item_unlock(
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struct xfs_log_item *lip)
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{
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if (lip->li_flags & XFS_LI_ABORTED)
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xfs_rui_item_free(RUI_ITEM(lip));
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}
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/*
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* The RUI is logged only once and cannot be moved in the log, so simply return
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* the lsn at which it's been logged.
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*/
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STATIC xfs_lsn_t
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xfs_rui_item_committed(
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struct xfs_log_item *lip,
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xfs_lsn_t lsn)
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{
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return lsn;
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}
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/*
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* The RUI dependency tracking op doesn't do squat. It can't because
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* it doesn't know where the free extent is coming from. The dependency
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* tracking has to be handled by the "enclosing" metadata object. For
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* example, for inodes, the inode is locked throughout the extent freeing
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* so the dependency should be recorded there.
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*/
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STATIC void
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xfs_rui_item_committing(
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struct xfs_log_item *lip,
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xfs_lsn_t lsn)
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{
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}
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/*
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* This is the ops vector shared by all rui log items.
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*/
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static const struct xfs_item_ops xfs_rui_item_ops = {
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.iop_size = xfs_rui_item_size,
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.iop_format = xfs_rui_item_format,
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.iop_pin = xfs_rui_item_pin,
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.iop_unpin = xfs_rui_item_unpin,
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.iop_unlock = xfs_rui_item_unlock,
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.iop_committed = xfs_rui_item_committed,
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.iop_push = xfs_rui_item_push,
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.iop_committing = xfs_rui_item_committing,
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};
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/*
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* Allocate and initialize an rui item with the given number of extents.
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*/
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struct xfs_rui_log_item *
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xfs_rui_init(
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struct xfs_mount *mp,
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uint nextents)
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{
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struct xfs_rui_log_item *ruip;
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uint size;
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ASSERT(nextents > 0);
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if (nextents > XFS_RUI_MAX_FAST_EXTENTS) {
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size = (uint)(sizeof(struct xfs_rui_log_item) +
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((nextents - 1) * sizeof(struct xfs_map_extent)));
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ruip = kmem_zalloc(size, KM_SLEEP);
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} else {
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ruip = kmem_zone_zalloc(xfs_rui_zone, KM_SLEEP);
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}
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xfs_log_item_init(mp, &ruip->rui_item, XFS_LI_RUI, &xfs_rui_item_ops);
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ruip->rui_format.rui_nextents = nextents;
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ruip->rui_format.rui_id = (uintptr_t)(void *)ruip;
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atomic_set(&ruip->rui_next_extent, 0);
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atomic_set(&ruip->rui_refcount, 2);
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return ruip;
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}
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/*
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* Copy an RUI format buffer from the given buf, and into the destination
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* RUI format structure. The RUI/RUD items were designed not to need any
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* special alignment handling.
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*/
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int
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xfs_rui_copy_format(
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struct xfs_log_iovec *buf,
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struct xfs_rui_log_format *dst_rui_fmt)
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{
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struct xfs_rui_log_format *src_rui_fmt;
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uint len;
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src_rui_fmt = buf->i_addr;
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len = sizeof(struct xfs_rui_log_format) +
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(src_rui_fmt->rui_nextents - 1) *
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sizeof(struct xfs_map_extent);
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if (buf->i_len != len)
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return -EFSCORRUPTED;
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memcpy((char *)dst_rui_fmt, (char *)src_rui_fmt, len);
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return 0;
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}
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/*
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* Freeing the RUI requires that we remove it from the AIL if it has already
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* been placed there. However, the RUI may not yet have been placed in the AIL
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* when called by xfs_rui_release() from RUD processing due to the ordering of
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* committed vs unpin operations in bulk insert operations. Hence the reference
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* count to ensure only the last caller frees the RUI.
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*/
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void
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xfs_rui_release(
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struct xfs_rui_log_item *ruip)
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{
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if (atomic_dec_and_test(&ruip->rui_refcount)) {
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xfs_trans_ail_remove(&ruip->rui_item, SHUTDOWN_LOG_IO_ERROR);
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xfs_rui_item_free(ruip);
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}
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}
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static inline struct xfs_rud_log_item *RUD_ITEM(struct xfs_log_item *lip)
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{
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return container_of(lip, struct xfs_rud_log_item, rud_item);
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}
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STATIC void
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xfs_rud_item_free(struct xfs_rud_log_item *rudp)
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{
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if (rudp->rud_format.rud_nextents > XFS_RUD_MAX_FAST_EXTENTS)
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kmem_free(rudp);
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else
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kmem_zone_free(xfs_rud_zone, rudp);
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}
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/*
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* This returns the number of iovecs needed to log the given rud item.
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* We only need 1 iovec for an rud item. It just logs the rud_log_format
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* structure.
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*/
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static inline int
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xfs_rud_item_sizeof(
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struct xfs_rud_log_item *rudp)
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{
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return sizeof(struct xfs_rud_log_format) +
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(rudp->rud_format.rud_nextents - 1) *
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sizeof(struct xfs_map_extent);
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}
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STATIC void
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xfs_rud_item_size(
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struct xfs_log_item *lip,
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int *nvecs,
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int *nbytes)
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{
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*nvecs += 1;
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*nbytes += xfs_rud_item_sizeof(RUD_ITEM(lip));
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}
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/*
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* This is called to fill in the vector of log iovecs for the
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* given rud log item. We use only 1 iovec, and we point that
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* at the rud_log_format structure embedded in the rud item.
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* It is at this point that we assert that all of the extent
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* slots in the rud item have been filled.
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*/
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STATIC void
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xfs_rud_item_format(
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struct xfs_log_item *lip,
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struct xfs_log_vec *lv)
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{
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struct xfs_rud_log_item *rudp = RUD_ITEM(lip);
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struct xfs_log_iovec *vecp = NULL;
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ASSERT(rudp->rud_next_extent == rudp->rud_format.rud_nextents);
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rudp->rud_format.rud_type = XFS_LI_RUD;
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rudp->rud_format.rud_size = 1;
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xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_RUD_FORMAT, &rudp->rud_format,
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xfs_rud_item_sizeof(rudp));
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}
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/*
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* Pinning has no meaning for an rud item, so just return.
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*/
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STATIC void
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xfs_rud_item_pin(
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struct xfs_log_item *lip)
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{
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}
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/*
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* Since pinning has no meaning for an rud item, unpinning does
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* not either.
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*/
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STATIC void
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xfs_rud_item_unpin(
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struct xfs_log_item *lip,
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int remove)
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{
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}
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/*
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* There isn't much you can do to push on an rud item. It is simply stuck
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* waiting for the log to be flushed to disk.
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*/
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STATIC uint
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xfs_rud_item_push(
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struct xfs_log_item *lip,
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struct list_head *buffer_list)
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{
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return XFS_ITEM_PINNED;
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}
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/*
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* The RUD is either committed or aborted if the transaction is cancelled. If
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* the transaction is cancelled, drop our reference to the RUI and free the
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* RUD.
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*/
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STATIC void
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xfs_rud_item_unlock(
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struct xfs_log_item *lip)
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{
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struct xfs_rud_log_item *rudp = RUD_ITEM(lip);
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if (lip->li_flags & XFS_LI_ABORTED) {
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xfs_rui_release(rudp->rud_ruip);
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xfs_rud_item_free(rudp);
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}
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}
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/*
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* When the rud item is committed to disk, all we need to do is delete our
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* reference to our partner rui item and then free ourselves. Since we're
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* freeing ourselves we must return -1 to keep the transaction code from
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* further referencing this item.
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*/
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STATIC xfs_lsn_t
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xfs_rud_item_committed(
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struct xfs_log_item *lip,
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xfs_lsn_t lsn)
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{
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struct xfs_rud_log_item *rudp = RUD_ITEM(lip);
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/*
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* Drop the RUI reference regardless of whether the RUD has been
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* aborted. Once the RUD transaction is constructed, it is the sole
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* responsibility of the RUD to release the RUI (even if the RUI is
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* aborted due to log I/O error).
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*/
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xfs_rui_release(rudp->rud_ruip);
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xfs_rud_item_free(rudp);
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return (xfs_lsn_t)-1;
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}
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/*
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* The RUD dependency tracking op doesn't do squat. It can't because
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* it doesn't know where the free extent is coming from. The dependency
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* tracking has to be handled by the "enclosing" metadata object. For
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* example, for inodes, the inode is locked throughout the extent freeing
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* so the dependency should be recorded there.
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*/
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STATIC void
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xfs_rud_item_committing(
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struct xfs_log_item *lip,
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xfs_lsn_t lsn)
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{
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}
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/*
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* This is the ops vector shared by all rud log items.
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*/
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static const struct xfs_item_ops xfs_rud_item_ops = {
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.iop_size = xfs_rud_item_size,
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.iop_format = xfs_rud_item_format,
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.iop_pin = xfs_rud_item_pin,
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.iop_unpin = xfs_rud_item_unpin,
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.iop_unlock = xfs_rud_item_unlock,
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.iop_committed = xfs_rud_item_committed,
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.iop_push = xfs_rud_item_push,
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.iop_committing = xfs_rud_item_committing,
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};
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/*
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* Allocate and initialize an rud item with the given number of extents.
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*/
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struct xfs_rud_log_item *
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xfs_rud_init(
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struct xfs_mount *mp,
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struct xfs_rui_log_item *ruip,
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uint nextents)
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{
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struct xfs_rud_log_item *rudp;
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uint size;
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ASSERT(nextents > 0);
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if (nextents > XFS_RUD_MAX_FAST_EXTENTS) {
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size = (uint)(sizeof(struct xfs_rud_log_item) +
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((nextents - 1) * sizeof(struct xfs_map_extent)));
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rudp = kmem_zalloc(size, KM_SLEEP);
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} else {
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rudp = kmem_zone_zalloc(xfs_rud_zone, KM_SLEEP);
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}
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xfs_log_item_init(mp, &rudp->rud_item, XFS_LI_RUD, &xfs_rud_item_ops);
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rudp->rud_ruip = ruip;
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rudp->rud_format.rud_nextents = nextents;
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rudp->rud_format.rud_rui_id = ruip->rui_format.rui_id;
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return rudp;
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}
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