linux/fs/xfs/xfs_inode_item_recover.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_inode_item.h"
#include "xfs_trace.h"
#include "xfs_trans_priv.h"
#include "xfs_buf_item.h"
#include "xfs_log.h"
#include "xfs_error.h"
#include "xfs_log_priv.h"
#include "xfs_log_recover.h"
#include "xfs_icache.h"
#include "xfs_bmap_btree.h"

STATIC void
xlog_recover_inode_ra_pass2(
	struct xlog                     *log,
	struct xlog_recover_item        *item)
{ … }

/*
 * Inode fork owner changes
 *
 * If we have been told that we have to reparent the inode fork, it's because an
 * extent swap operation on a CRC enabled filesystem has been done and we are
 * replaying it. We need to walk the BMBT of the appropriate fork and change the
 * owners of it.
 *
 * The complexity here is that we don't have an inode context to work with, so
 * after we've replayed the inode we need to instantiate one.  This is where the
 * fun begins.
 *
 * We are in the middle of log recovery, so we can't run transactions. That
 * means we cannot use cache coherent inode instantiation via xfs_iget(), as
 * that will result in the corresponding iput() running the inode through
 * xfs_inactive(). If we've just replayed an inode core that changes the link
 * count to zero (i.e. it's been unlinked), then xfs_inactive() will run
 * transactions (bad!).
 *
 * So, to avoid this, we instantiate an inode directly from the inode core we've
 * just recovered. We have the buffer still locked, and all we really need to
 * instantiate is the inode core and the forks being modified. We can do this
 * manually, then run the inode btree owner change, and then tear down the
 * xfs_inode without having to run any transactions at all.
 *
 * Also, because we don't have a transaction context available here but need to
 * gather all the buffers we modify for writeback so we pass the buffer_list
 * instead for the operation to use.
 */

STATIC int
xfs_recover_inode_owner_change(
	struct xfs_mount	*mp,
	struct xfs_dinode	*dip,
	struct xfs_inode_log_format *in_f,
	struct list_head	*buffer_list)
{ … }

static inline bool xfs_log_dinode_has_bigtime(const struct xfs_log_dinode *ld)
{ … }

/* Convert a log timestamp to an ondisk timestamp. */
static inline xfs_timestamp_t
xfs_log_dinode_to_disk_ts(
	struct xfs_log_dinode		*from,
	const xfs_log_timestamp_t	its)
{ … }

static inline bool xfs_log_dinode_has_large_extent_counts(
		const struct xfs_log_dinode *ld)
{ … }

static inline void
xfs_log_dinode_to_disk_iext_counters(
	struct xfs_log_dinode	*from,
	struct xfs_dinode	*to)
{ … }

STATIC void
xfs_log_dinode_to_disk(
	struct xfs_log_dinode	*from,
	struct xfs_dinode	*to,
	xfs_lsn_t		lsn)
{ … }

STATIC int
xlog_dinode_verify_extent_counts(
	struct xfs_mount	*mp,
	struct xfs_log_dinode	*ldip)
{ … }

STATIC int
xlog_recover_inode_commit_pass2(
	struct xlog			*log,
	struct list_head		*buffer_list,
	struct xlog_recover_item	*item,
	xfs_lsn_t			current_lsn)
{ … }

const struct xlog_recover_item_ops xlog_inode_item_ops = …;