fs/xfs/xfs_iunlink_item.c

Source file repositories/reference/linux-study-clean/fs/xfs/xfs_iunlink_item.c

File Facts

System
Linux kernel
Corpus path
fs/xfs/xfs_iunlink_item.c
Extension
.c
Size
4622 bytes
Lines
178
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2020-2022, Red Hat, Inc.
 * All Rights Reserved.
 */
#include "xfs_platform.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_trans_priv.h"
#include "xfs_ag.h"
#include "xfs_iunlink_item.h"
#include "xfs_trace.h"
#include "xfs_error.h"

struct kmem_cache	*xfs_iunlink_cache;

static inline struct xfs_iunlink_item *IUL_ITEM(struct xfs_log_item *lip)
{
	return container_of(lip, struct xfs_iunlink_item, item);
}

static void
xfs_iunlink_item_release(
	struct xfs_log_item	*lip)
{
	struct xfs_iunlink_item	*iup = IUL_ITEM(lip);

	xfs_perag_put(iup->pag);
	kmem_cache_free(xfs_iunlink_cache, IUL_ITEM(lip));
}


static uint64_t
xfs_iunlink_item_sort(
	struct xfs_log_item	*lip)
{
	return I_INO(IUL_ITEM(lip)->ip);
}

/*
 * Look up the inode cluster buffer and log the on-disk unlinked inode change
 * we need to make.
 */
static int
xfs_iunlink_log_dinode(
	struct xfs_trans	*tp,
	struct xfs_iunlink_item	*iup)
{
	struct xfs_inode	*ip = iup->ip;
	struct xfs_dinode	*dip;
	struct xfs_buf		*ibp;
	xfs_agino_t		old_ptr;
	int			offset;
	int			error;

	error = xfs_read_icluster(iup->pag, tp, ip->i_imap.im_agbno, &ibp);
	if (error)
		return error;
	/*
	 * Don't log the unlinked field on stale buffers as this may be the
	 * transaction that frees the inode cluster and relogging the buffer
	 * here will incorrectly remove the stale state.
	 */
	if (ibp->b_flags & XBF_STALE)
		goto out;

	dip = xfs_buf_offset(ibp, ip->i_imap.im_boffset);

	/* Make sure the old pointer isn't garbage. */
	old_ptr = be32_to_cpu(dip->di_next_unlinked);
	if (old_ptr != iup->old_agino) {
		xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, dip,
				sizeof(*dip), __this_address);
		error = -EFSCORRUPTED;
		goto out;
	}

	trace_xfs_iunlink_update_dinode(iup, old_ptr);

	dip->di_next_unlinked = cpu_to_be32(iup->next_agino);
	offset = ip->i_imap.im_boffset +
			offsetof(struct xfs_dinode, di_next_unlinked);

	xfs_dinode_calc_crc(tp->t_mountp, dip);

Annotation

Implementation Notes