508 строки
14 KiB
C
508 строки
14 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_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_extfree_item.h"
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#include "xfs_log.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 inline struct xfs_efi_log_item *EFI_ITEM(struct xfs_log_item *lip)
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{
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return container_of(lip, struct xfs_efi_log_item, efi_item);
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}
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void
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xfs_efi_item_free(
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struct xfs_efi_log_item *efip)
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{
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if (efip->efi_format.efi_nextents > 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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* Freeing the efi requires that we remove it from the AIL if it has already
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* been placed there. However, the EFI may not yet have been placed in the AIL
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* when called by xfs_efi_release() from EFD 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 EFI.
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*/
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STATIC void
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__xfs_efi_release(
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struct xfs_efi_log_item *efip)
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{
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struct xfs_ail *ailp = efip->efi_item.li_ailp;
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if (atomic_dec_and_test(&efip->efi_refcount)) {
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spin_lock(&ailp->xa_lock);
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/* xfs_trans_ail_delete() drops the AIL lock. */
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xfs_trans_ail_delete(ailp, &efip->efi_item,
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SHUTDOWN_LOG_IO_ERROR);
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xfs_efi_item_free(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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static inline int
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xfs_efi_item_sizeof(
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struct xfs_efi_log_item *efip)
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{
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return sizeof(struct xfs_efi_log_format) +
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(efip->efi_format.efi_nextents - 1) * sizeof(xfs_extent_t);
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}
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STATIC void
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xfs_efi_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_efi_item_sizeof(EFI_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 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(
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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_efi_log_item *efip = EFI_ITEM(lip);
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struct xfs_log_iovec *vecp = NULL;
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ASSERT(atomic_read(&efip->efi_next_extent) ==
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efip->efi_format.efi_nextents);
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efip->efi_format.efi_type = XFS_LI_EFI;
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efip->efi_format.efi_size = 1;
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xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_EFI_FORMAT,
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&efip->efi_format,
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xfs_efi_item_sizeof(efip));
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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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STATIC void
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xfs_efi_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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* While EFIs cannot really be pinned, the unpin operation is the last place at
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* which the EFI is manipulated during a transaction. If we are being asked to
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* remove the EFI it's because the transaction has been cancelled and by
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* definition that means the EFI cannot be in the AIL so remove it from the
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* transaction and free it. Otherwise coordinate with xfs_efi_release()
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* to determine who gets to free the EFI.
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*/
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STATIC void
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xfs_efi_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_efi_log_item *efip = EFI_ITEM(lip);
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if (remove) {
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ASSERT(!(lip->li_flags & XFS_LI_IN_AIL));
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if (lip->li_desc)
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xfs_trans_del_item(lip);
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xfs_efi_item_free(efip);
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return;
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}
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__xfs_efi_release(efip);
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}
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/*
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* Efi items have no locking or pushing. However, since EFIs are pulled from
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* the AIL when their corresponding EFDs 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 EFI out of
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* the AIL.
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*/
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STATIC uint
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xfs_efi_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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STATIC void
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xfs_efi_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_efi_item_free(EFI_ITEM(lip));
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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 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_efi_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 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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STATIC void
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xfs_efi_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 efi log items.
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*/
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static const struct xfs_item_ops xfs_efi_item_ops = {
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.iop_size = xfs_efi_item_size,
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.iop_format = xfs_efi_item_format,
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.iop_pin = xfs_efi_item_pin,
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.iop_unpin = xfs_efi_item_unpin,
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.iop_unlock = xfs_efi_item_unlock,
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.iop_committed = xfs_efi_item_committed,
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.iop_push = xfs_efi_item_push,
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.iop_committing = 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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struct xfs_efi_log_item *
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xfs_efi_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_efi_log_item *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 = kmem_zalloc(size, KM_SLEEP);
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} else {
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efip = kmem_zone_zalloc(xfs_efi_zone, KM_SLEEP);
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}
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xfs_log_item_init(mp, &efip->efi_item, XFS_LI_EFI, &xfs_efi_item_ops);
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efip->efi_format.efi_nextents = nextents;
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efip->efi_format.efi_id = (uintptr_t)(void *)efip;
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atomic_set(&efip->efi_next_extent, 0);
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atomic_set(&efip->efi_refcount, 2);
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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 = 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 = 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 = 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 the given
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* efi item. Each efd calls this with the number of extents that it has
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* logged, and when the sum of these reaches the total number of extents logged
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* by this efi item we can free the efi item.
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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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ASSERT(atomic_read(&efip->efi_next_extent) >= nextents);
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if (atomic_sub_and_test(nextents, &efip->efi_next_extent)) {
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/* recovery needs us to drop the EFI reference, too */
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if (test_bit(XFS_EFI_RECOVERED, &efip->efi_flags))
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__xfs_efi_release(efip);
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__xfs_efi_release(efip);
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/* efip may now have been freed, do not reference it again. */
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}
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}
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static inline struct xfs_efd_log_item *EFD_ITEM(struct xfs_log_item *lip)
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{
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return container_of(lip, struct xfs_efd_log_item, efd_item);
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}
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STATIC void
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xfs_efd_item_free(struct xfs_efd_log_item *efdp)
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{
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if (efdp->efd_format.efd_nextents > 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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* 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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static inline int
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xfs_efd_item_sizeof(
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struct xfs_efd_log_item *efdp)
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{
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return sizeof(xfs_efd_log_format_t) +
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(efdp->efd_format.efd_nextents - 1) * sizeof(xfs_extent_t);
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}
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STATIC void
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xfs_efd_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_efd_item_sizeof(EFD_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 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(
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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_efd_log_item *efdp = EFD_ITEM(lip);
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struct xfs_log_iovec *vecp = NULL;
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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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efdp->efd_format.efd_size = 1;
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xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_EFD_FORMAT,
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&efdp->efd_format,
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xfs_efd_item_sizeof(efdp));
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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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STATIC void
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xfs_efd_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 efd item, unpinning does
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* not either.
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*/
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STATIC void
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xfs_efd_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 efd 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_efd_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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STATIC void
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xfs_efd_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_efd_item_free(EFD_ITEM(lip));
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}
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/*
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* When the efd item is committed to disk, all we need to do
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* is delete our reference to our partner efi item and then
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* free ourselves. Since we're freeing ourselves we must
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* return -1 to keep the transaction code from further referencing
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* this item.
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*/
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STATIC xfs_lsn_t
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xfs_efd_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_efd_log_item *efdp = EFD_ITEM(lip);
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/*
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* If we got a log I/O error, it's always the case that the LR with the
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* EFI got unpinned and freed before the EFD got aborted.
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*/
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if (!(lip->li_flags & XFS_LI_ABORTED))
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xfs_efi_release(efdp->efd_efip, efdp->efd_format.efd_nextents);
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xfs_efd_item_free(efdp);
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return (xfs_lsn_t)-1;
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}
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/*
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* The EFD 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_efd_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 efd log items.
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*/
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static const struct xfs_item_ops xfs_efd_item_ops = {
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.iop_size = xfs_efd_item_size,
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.iop_format = xfs_efd_item_format,
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.iop_pin = xfs_efd_item_pin,
|
|
.iop_unpin = xfs_efd_item_unpin,
|
|
.iop_unlock = xfs_efd_item_unlock,
|
|
.iop_committed = xfs_efd_item_committed,
|
|
.iop_push = xfs_efd_item_push,
|
|
.iop_committing = xfs_efd_item_committing
|
|
};
|
|
|
|
/*
|
|
* Allocate and initialize an efd item with the given number of extents.
|
|
*/
|
|
struct xfs_efd_log_item *
|
|
xfs_efd_init(
|
|
struct xfs_mount *mp,
|
|
struct xfs_efi_log_item *efip,
|
|
uint nextents)
|
|
|
|
{
|
|
struct xfs_efd_log_item *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 = kmem_zalloc(size, KM_SLEEP);
|
|
} else {
|
|
efdp = kmem_zone_zalloc(xfs_efd_zone, KM_SLEEP);
|
|
}
|
|
|
|
xfs_log_item_init(mp, &efdp->efd_item, XFS_LI_EFD, &xfs_efd_item_ops);
|
|
efdp->efd_efip = efip;
|
|
efdp->efd_format.efd_nextents = nextents;
|
|
efdp->efd_format.efd_efi_id = efip->efi_format.efi_id;
|
|
|
|
return efdp;
|
|
}
|