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ddf92053e4
The iop_unlock method is called when comitting or cancelling a transaction. In the latter case, the transaction may or may not be aborted. While there is no known problem with the current code in practice, this implementation is limited in that any log item implementation that might want to differentiate between a commit and a cancellation must rely on the aborted state. The aborted bit is only set when the cancelled transaction is dirty, however. This means that there is no way to distinguish between a commit and a clean transaction cancellation. For example, intent log items currently rely on this distinction. The log item is either transferred to the CIL on commit or released on transaction cancel. There is currently no possibility for a clean intent log item in a transaction, but if that state is ever introduced a cancel of such a transaction will immediately result in memory leaks of the associated log item(s). This is an interface deficiency and landmine. To clean this up, replace the iop_unlock method with an iop_release method that is specific to transaction cancel. The existing iop_committing method occurs at the same time as iop_unlock in the commit path and there is no need for two separate callbacks here. Overload the iop_committing method with the current commit time iop_unlock implementations to eliminate the need for the latter and further simplify the interface. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2008-2010, 2013 Dave Chinner
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.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_error.h"
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#include "xfs_icreate_item.h"
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#include "xfs_log.h"
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kmem_zone_t *xfs_icreate_zone; /* inode create item zone */
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static inline struct xfs_icreate_item *ICR_ITEM(struct xfs_log_item *lip)
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{
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return container_of(lip, struct xfs_icreate_item, ic_item);
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}
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/*
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* This returns the number of iovecs needed to log the given inode item.
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*
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* We only need one iovec for the icreate log structure.
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*/
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STATIC void
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xfs_icreate_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 += sizeof(struct xfs_icreate_log);
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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 inode create log item.
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*/
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STATIC void
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xfs_icreate_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_icreate_item *icp = ICR_ITEM(lip);
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struct xfs_log_iovec *vecp = NULL;
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xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ICREATE,
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&icp->ic_format,
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sizeof(struct xfs_icreate_log));
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}
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STATIC void
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xfs_icreate_item_release(
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struct xfs_log_item *lip)
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{
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kmem_zone_free(xfs_icreate_zone, ICR_ITEM(lip));
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}
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/*
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* Because we have ordered buffers being tracked in the AIL for the inode
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* creation, we don't need the create item after this. Hence we can free
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* the log item and return -1 to tell the caller we're done with the item.
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*/
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STATIC xfs_lsn_t
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xfs_icreate_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_icreate_item *icp = ICR_ITEM(lip);
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kmem_zone_free(xfs_icreate_zone, icp);
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return (xfs_lsn_t)-1;
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}
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/*
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* This is the ops vector shared by all buf log items.
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*/
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static const struct xfs_item_ops xfs_icreate_item_ops = {
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.iop_size = xfs_icreate_item_size,
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.iop_format = xfs_icreate_item_format,
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.iop_release = xfs_icreate_item_release,
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.iop_committed = xfs_icreate_item_committed,
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};
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/*
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* Initialize the inode log item for a newly allocated (in-core) inode.
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*
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* Inode extents can only reside within an AG. Hence specify the starting
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* block for the inode chunk by offset within an AG as well as the
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* length of the allocated extent.
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*
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* This joins the item to the transaction and marks it dirty so
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* that we don't need a separate call to do this, nor does the
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* caller need to know anything about the icreate item.
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*/
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void
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xfs_icreate_log(
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struct xfs_trans *tp,
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xfs_agnumber_t agno,
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xfs_agblock_t agbno,
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unsigned int count,
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unsigned int inode_size,
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xfs_agblock_t length,
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unsigned int generation)
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{
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struct xfs_icreate_item *icp;
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icp = kmem_zone_zalloc(xfs_icreate_zone, KM_SLEEP);
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xfs_log_item_init(tp->t_mountp, &icp->ic_item, XFS_LI_ICREATE,
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&xfs_icreate_item_ops);
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icp->ic_format.icl_type = XFS_LI_ICREATE;
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icp->ic_format.icl_size = 1; /* single vector */
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icp->ic_format.icl_ag = cpu_to_be32(agno);
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icp->ic_format.icl_agbno = cpu_to_be32(agbno);
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icp->ic_format.icl_count = cpu_to_be32(count);
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icp->ic_format.icl_isize = cpu_to_be32(inode_size);
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icp->ic_format.icl_length = cpu_to_be32(length);
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icp->ic_format.icl_gen = cpu_to_be32(generation);
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xfs_trans_add_item(tp, &icp->ic_item);
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tp->t_flags |= XFS_TRANS_DIRTY;
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set_bit(XFS_LI_DIRTY, &icp->ic_item.li_flags);
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}
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