574 lines
15 KiB
C
574 lines
15 KiB
C
/*
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* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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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 as
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* published by the Free Software Foundation.
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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_types.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
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#include "xfs_buf_item.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dmapi.h"
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#include "xfs_mount.h"
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#include "xfs_trans_priv.h"
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#include "xfs_extfree_item.h"
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kmem_zone_t *xfs_efi_zone;
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kmem_zone_t *xfs_efd_zone;
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STATIC void xfs_efi_item_unlock(xfs_efi_log_item_t *);
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void
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xfs_efi_item_free(xfs_efi_log_item_t *efip)
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{
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int nexts = efip->efi_format.efi_nextents;
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if (nexts > XFS_EFI_MAX_FAST_EXTENTS) {
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kmem_free(efip);
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} else {
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kmem_zone_free(xfs_efi_zone, efip);
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}
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}
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/*
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* This returns the number of iovecs needed to log the given efi item.
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* We only need 1 iovec for an efi item. It just logs the efi_log_format
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* structure.
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*/
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/*ARGSUSED*/
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STATIC uint
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xfs_efi_item_size(xfs_efi_log_item_t *efip)
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{
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return 1;
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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 efi log item. We use only 1 iovec, and we point that
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* at the efi_log_format structure embedded in the efi 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 efi item have been filled.
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*/
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STATIC void
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xfs_efi_item_format(xfs_efi_log_item_t *efip,
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xfs_log_iovec_t *log_vector)
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{
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uint size;
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ASSERT(efip->efi_next_extent == efip->efi_format.efi_nextents);
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efip->efi_format.efi_type = XFS_LI_EFI;
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size = sizeof(xfs_efi_log_format_t);
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size += (efip->efi_format.efi_nextents - 1) * sizeof(xfs_extent_t);
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efip->efi_format.efi_size = 1;
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log_vector->i_addr = (xfs_caddr_t)&(efip->efi_format);
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log_vector->i_len = size;
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XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_EFI_FORMAT);
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ASSERT(size >= sizeof(xfs_efi_log_format_t));
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}
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/*
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* Pinning has no meaning for an efi item, so just return.
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*/
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/*ARGSUSED*/
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STATIC void
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xfs_efi_item_pin(xfs_efi_log_item_t *efip)
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{
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return;
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}
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/*
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* While EFIs cannot really be pinned, the unpin operation is the
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* last place at which the EFI is manipulated during a transaction.
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* Here we coordinate with xfs_efi_cancel() to determine who gets to
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* free the EFI.
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*/
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/*ARGSUSED*/
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STATIC void
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xfs_efi_item_unpin(xfs_efi_log_item_t *efip, int stale)
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{
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xfs_mount_t *mp;
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mp = efip->efi_item.li_mountp;
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spin_lock(&mp->m_ail_lock);
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if (efip->efi_flags & XFS_EFI_CANCELED) {
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/*
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* xfs_trans_delete_ail() drops the AIL lock.
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*/
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xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip);
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xfs_efi_item_free(efip);
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} else {
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efip->efi_flags |= XFS_EFI_COMMITTED;
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spin_unlock(&mp->m_ail_lock);
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}
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}
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/*
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* like unpin only we have to also clear the xaction descriptor
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* pointing the log item if we free the item. This routine duplicates
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* unpin because efi_flags is protected by the AIL lock. Freeing
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* the descriptor and then calling unpin would force us to drop the AIL
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* lock which would open up a race condition.
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*/
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STATIC void
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xfs_efi_item_unpin_remove(xfs_efi_log_item_t *efip, xfs_trans_t *tp)
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{
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xfs_mount_t *mp;
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xfs_log_item_desc_t *lidp;
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mp = efip->efi_item.li_mountp;
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spin_lock(&mp->m_ail_lock);
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if (efip->efi_flags & XFS_EFI_CANCELED) {
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/*
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* free the xaction descriptor pointing to this item
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*/
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lidp = xfs_trans_find_item(tp, (xfs_log_item_t *) efip);
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xfs_trans_free_item(tp, lidp);
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/*
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* pull the item off the AIL.
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* xfs_trans_delete_ail() drops the AIL lock.
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*/
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xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip);
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xfs_efi_item_free(efip);
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} else {
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efip->efi_flags |= XFS_EFI_COMMITTED;
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spin_unlock(&mp->m_ail_lock);
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}
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}
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/*
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* Efi items have no locking or pushing. However, since EFIs are
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* pulled from the AIL when their corresponding EFDs are committed
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* to disk, their situation is very similar to being pinned. Return
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* XFS_ITEM_PINNED so that the caller will eventually flush the log.
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* This should help in getting the EFI out of the AIL.
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*/
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/*ARGSUSED*/
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STATIC uint
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xfs_efi_item_trylock(xfs_efi_log_item_t *efip)
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{
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return XFS_ITEM_PINNED;
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}
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/*
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* Efi items have no locking, so just return.
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*/
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/*ARGSUSED*/
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STATIC void
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xfs_efi_item_unlock(xfs_efi_log_item_t *efip)
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{
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if (efip->efi_item.li_flags & XFS_LI_ABORTED)
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xfs_efi_item_free(efip);
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return;
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}
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/*
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* The EFI is logged only once and cannot be moved in the log, so
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* simply return the lsn at which it's been logged. The canceled
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* flag is not paid any attention here. Checking for that is delayed
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* until the EFI is unpinned.
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*/
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/*ARGSUSED*/
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STATIC xfs_lsn_t
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xfs_efi_item_committed(xfs_efi_log_item_t *efip, 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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* There isn't much you can do to push on an efi item. It is simply
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* stuck waiting for all of its corresponding efd items to be
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* committed to disk.
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*/
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/*ARGSUSED*/
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STATIC void
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xfs_efi_item_push(xfs_efi_log_item_t *efip)
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{
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return;
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}
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/*
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* The EFI 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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/*ARGSUSED*/
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STATIC void
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xfs_efi_item_committing(xfs_efi_log_item_t *efip, xfs_lsn_t lsn)
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{
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return;
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}
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/*
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* This is the ops vector shared by all efi log items.
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*/
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static struct xfs_item_ops xfs_efi_item_ops = {
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.iop_size = (uint(*)(xfs_log_item_t*))xfs_efi_item_size,
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.iop_format = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
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xfs_efi_item_format,
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.iop_pin = (void(*)(xfs_log_item_t*))xfs_efi_item_pin,
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.iop_unpin = (void(*)(xfs_log_item_t*, int))xfs_efi_item_unpin,
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.iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t *))
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xfs_efi_item_unpin_remove,
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.iop_trylock = (uint(*)(xfs_log_item_t*))xfs_efi_item_trylock,
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.iop_unlock = (void(*)(xfs_log_item_t*))xfs_efi_item_unlock,
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.iop_committed = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
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xfs_efi_item_committed,
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.iop_push = (void(*)(xfs_log_item_t*))xfs_efi_item_push,
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.iop_pushbuf = NULL,
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.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
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xfs_efi_item_committing
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};
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/*
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* Allocate and initialize an efi item with the given number of extents.
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*/
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xfs_efi_log_item_t *
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xfs_efi_init(xfs_mount_t *mp,
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uint nextents)
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{
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xfs_efi_log_item_t *efip;
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uint size;
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ASSERT(nextents > 0);
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if (nextents > XFS_EFI_MAX_FAST_EXTENTS) {
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size = (uint)(sizeof(xfs_efi_log_item_t) +
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((nextents - 1) * sizeof(xfs_extent_t)));
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efip = (xfs_efi_log_item_t*)kmem_zalloc(size, KM_SLEEP);
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} else {
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efip = (xfs_efi_log_item_t*)kmem_zone_zalloc(xfs_efi_zone,
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KM_SLEEP);
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}
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efip->efi_item.li_type = XFS_LI_EFI;
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efip->efi_item.li_ops = &xfs_efi_item_ops;
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efip->efi_item.li_mountp = mp;
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efip->efi_format.efi_nextents = nextents;
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efip->efi_format.efi_id = (__psint_t)(void*)efip;
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return (efip);
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}
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/*
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* Copy an EFI format buffer from the given buf, and into the destination
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* EFI format structure.
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* The given buffer can be in 32 bit or 64 bit form (which has different padding),
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* one of which will be the native format for this kernel.
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* It will handle the conversion of formats if necessary.
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*/
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int
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xfs_efi_copy_format(xfs_log_iovec_t *buf, xfs_efi_log_format_t *dst_efi_fmt)
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{
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xfs_efi_log_format_t *src_efi_fmt = (xfs_efi_log_format_t *)buf->i_addr;
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uint i;
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uint len = sizeof(xfs_efi_log_format_t) +
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(src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_t);
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uint len32 = sizeof(xfs_efi_log_format_32_t) +
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(src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_32_t);
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uint len64 = sizeof(xfs_efi_log_format_64_t) +
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(src_efi_fmt->efi_nextents - 1) * sizeof(xfs_extent_64_t);
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if (buf->i_len == len) {
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memcpy((char *)dst_efi_fmt, (char*)src_efi_fmt, len);
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return 0;
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} else if (buf->i_len == len32) {
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xfs_efi_log_format_32_t *src_efi_fmt_32 =
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(xfs_efi_log_format_32_t *)buf->i_addr;
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dst_efi_fmt->efi_type = src_efi_fmt_32->efi_type;
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dst_efi_fmt->efi_size = src_efi_fmt_32->efi_size;
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dst_efi_fmt->efi_nextents = src_efi_fmt_32->efi_nextents;
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dst_efi_fmt->efi_id = src_efi_fmt_32->efi_id;
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for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
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dst_efi_fmt->efi_extents[i].ext_start =
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src_efi_fmt_32->efi_extents[i].ext_start;
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dst_efi_fmt->efi_extents[i].ext_len =
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src_efi_fmt_32->efi_extents[i].ext_len;
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}
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return 0;
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} else if (buf->i_len == len64) {
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xfs_efi_log_format_64_t *src_efi_fmt_64 =
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(xfs_efi_log_format_64_t *)buf->i_addr;
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dst_efi_fmt->efi_type = src_efi_fmt_64->efi_type;
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dst_efi_fmt->efi_size = src_efi_fmt_64->efi_size;
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dst_efi_fmt->efi_nextents = src_efi_fmt_64->efi_nextents;
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dst_efi_fmt->efi_id = src_efi_fmt_64->efi_id;
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for (i = 0; i < dst_efi_fmt->efi_nextents; i++) {
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dst_efi_fmt->efi_extents[i].ext_start =
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src_efi_fmt_64->efi_extents[i].ext_start;
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dst_efi_fmt->efi_extents[i].ext_len =
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src_efi_fmt_64->efi_extents[i].ext_len;
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}
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return 0;
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}
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return EFSCORRUPTED;
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}
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/*
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* This is called by the efd item code below to release references to
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* the given efi item. Each efd calls this with the number of
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* extents that it has logged, and when the sum of these reaches
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* the total number of extents logged by this efi item we can free
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* the efi item.
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*
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* Freeing the efi item requires that we remove it from the AIL.
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* We'll use the AIL lock to protect our counters as well as
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* the removal from the AIL.
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*/
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void
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xfs_efi_release(xfs_efi_log_item_t *efip,
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uint nextents)
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{
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xfs_mount_t *mp;
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int extents_left;
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mp = efip->efi_item.li_mountp;
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ASSERT(efip->efi_next_extent > 0);
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ASSERT(efip->efi_flags & XFS_EFI_COMMITTED);
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spin_lock(&mp->m_ail_lock);
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ASSERT(efip->efi_next_extent >= nextents);
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efip->efi_next_extent -= nextents;
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extents_left = efip->efi_next_extent;
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if (extents_left == 0) {
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/*
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* xfs_trans_delete_ail() drops the AIL lock.
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*/
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xfs_trans_delete_ail(mp, (xfs_log_item_t *)efip);
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xfs_efi_item_free(efip);
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} else {
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spin_unlock(&mp->m_ail_lock);
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}
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}
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STATIC void
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xfs_efd_item_free(xfs_efd_log_item_t *efdp)
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{
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int nexts = efdp->efd_format.efd_nextents;
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if (nexts > XFS_EFD_MAX_FAST_EXTENTS) {
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kmem_free(efdp);
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} else {
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kmem_zone_free(xfs_efd_zone, efdp);
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}
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}
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/*
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* This returns the number of iovecs needed to log the given efd item.
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* We only need 1 iovec for an efd item. It just logs the efd_log_format
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* structure.
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*/
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/*ARGSUSED*/
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STATIC uint
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xfs_efd_item_size(xfs_efd_log_item_t *efdp)
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{
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return 1;
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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 efd log item. We use only 1 iovec, and we point that
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* at the efd_log_format structure embedded in the efd 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 efd item have been filled.
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*/
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STATIC void
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xfs_efd_item_format(xfs_efd_log_item_t *efdp,
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xfs_log_iovec_t *log_vector)
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{
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uint size;
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ASSERT(efdp->efd_next_extent == efdp->efd_format.efd_nextents);
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efdp->efd_format.efd_type = XFS_LI_EFD;
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size = sizeof(xfs_efd_log_format_t);
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size += (efdp->efd_format.efd_nextents - 1) * sizeof(xfs_extent_t);
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efdp->efd_format.efd_size = 1;
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log_vector->i_addr = (xfs_caddr_t)&(efdp->efd_format);
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log_vector->i_len = size;
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XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_EFD_FORMAT);
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ASSERT(size >= sizeof(xfs_efd_log_format_t));
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}
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/*
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* Pinning has no meaning for an efd item, so just return.
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*/
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/*ARGSUSED*/
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STATIC void
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xfs_efd_item_pin(xfs_efd_log_item_t *efdp)
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{
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return;
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}
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/*
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* Since pinning has no meaning for an efd item, unpinning does
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* not either.
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*/
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/*ARGSUSED*/
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STATIC void
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xfs_efd_item_unpin(xfs_efd_log_item_t *efdp, int stale)
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{
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return;
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}
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/*ARGSUSED*/
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STATIC void
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xfs_efd_item_unpin_remove(xfs_efd_log_item_t *efdp, xfs_trans_t *tp)
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{
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return;
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}
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/*
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* Efd items have no locking, so just return success.
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*/
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/*ARGSUSED*/
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STATIC uint
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xfs_efd_item_trylock(xfs_efd_log_item_t *efdp)
|
|
{
|
|
return XFS_ITEM_LOCKED;
|
|
}
|
|
|
|
/*
|
|
* Efd items have no locking or pushing, so return failure
|
|
* so that the caller doesn't bother with us.
|
|
*/
|
|
/*ARGSUSED*/
|
|
STATIC void
|
|
xfs_efd_item_unlock(xfs_efd_log_item_t *efdp)
|
|
{
|
|
if (efdp->efd_item.li_flags & XFS_LI_ABORTED)
|
|
xfs_efd_item_free(efdp);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* When the efd item is committed to disk, all we need to do
|
|
* is delete our reference to our partner efi item and then
|
|
* free ourselves. Since we're freeing ourselves we must
|
|
* return -1 to keep the transaction code from further referencing
|
|
* this item.
|
|
*/
|
|
/*ARGSUSED*/
|
|
STATIC xfs_lsn_t
|
|
xfs_efd_item_committed(xfs_efd_log_item_t *efdp, xfs_lsn_t lsn)
|
|
{
|
|
/*
|
|
* If we got a log I/O error, it's always the case that the LR with the
|
|
* EFI got unpinned and freed before the EFD got aborted.
|
|
*/
|
|
if ((efdp->efd_item.li_flags & XFS_LI_ABORTED) == 0)
|
|
xfs_efi_release(efdp->efd_efip, efdp->efd_format.efd_nextents);
|
|
|
|
xfs_efd_item_free(efdp);
|
|
return (xfs_lsn_t)-1;
|
|
}
|
|
|
|
/*
|
|
* There isn't much you can do to push on an efd item. It is simply
|
|
* stuck waiting for the log to be flushed to disk.
|
|
*/
|
|
/*ARGSUSED*/
|
|
STATIC void
|
|
xfs_efd_item_push(xfs_efd_log_item_t *efdp)
|
|
{
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* The EFD 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.
|
|
*/
|
|
/*ARGSUSED*/
|
|
STATIC void
|
|
xfs_efd_item_committing(xfs_efd_log_item_t *efip, xfs_lsn_t lsn)
|
|
{
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* This is the ops vector shared by all efd log items.
|
|
*/
|
|
static struct xfs_item_ops xfs_efd_item_ops = {
|
|
.iop_size = (uint(*)(xfs_log_item_t*))xfs_efd_item_size,
|
|
.iop_format = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
|
|
xfs_efd_item_format,
|
|
.iop_pin = (void(*)(xfs_log_item_t*))xfs_efd_item_pin,
|
|
.iop_unpin = (void(*)(xfs_log_item_t*, int))xfs_efd_item_unpin,
|
|
.iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
|
|
xfs_efd_item_unpin_remove,
|
|
.iop_trylock = (uint(*)(xfs_log_item_t*))xfs_efd_item_trylock,
|
|
.iop_unlock = (void(*)(xfs_log_item_t*))xfs_efd_item_unlock,
|
|
.iop_committed = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
|
|
xfs_efd_item_committed,
|
|
.iop_push = (void(*)(xfs_log_item_t*))xfs_efd_item_push,
|
|
.iop_pushbuf = NULL,
|
|
.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
|
|
xfs_efd_item_committing
|
|
};
|
|
|
|
|
|
/*
|
|
* Allocate and initialize an efd item with the given number of extents.
|
|
*/
|
|
xfs_efd_log_item_t *
|
|
xfs_efd_init(xfs_mount_t *mp,
|
|
xfs_efi_log_item_t *efip,
|
|
uint nextents)
|
|
|
|
{
|
|
xfs_efd_log_item_t *efdp;
|
|
uint size;
|
|
|
|
ASSERT(nextents > 0);
|
|
if (nextents > XFS_EFD_MAX_FAST_EXTENTS) {
|
|
size = (uint)(sizeof(xfs_efd_log_item_t) +
|
|
((nextents - 1) * sizeof(xfs_extent_t)));
|
|
efdp = (xfs_efd_log_item_t*)kmem_zalloc(size, KM_SLEEP);
|
|
} else {
|
|
efdp = (xfs_efd_log_item_t*)kmem_zone_zalloc(xfs_efd_zone,
|
|
KM_SLEEP);
|
|
}
|
|
|
|
efdp->efd_item.li_type = XFS_LI_EFD;
|
|
efdp->efd_item.li_ops = &xfs_efd_item_ops;
|
|
efdp->efd_item.li_mountp = mp;
|
|
efdp->efd_efip = efip;
|
|
efdp->efd_format.efd_nextents = nextents;
|
|
efdp->efd_format.efd_efi_id = efip->efi_format.efi_id;
|
|
|
|
return (efdp);
|
|
}
|