path: root/fs/xfs/xfs_inode_item.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2002,2005 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_log_priv.h"
#include "xfs_error.h"

#include <linux/iversion.h>

struct kmem_cache	*xfs_ili_cache;		/* inode log item */

static inline struct xfs_inode_log_item *INODE_ITEM(struct xfs_log_item *lip)
{
	return container_of(lip, struct xfs_inode_log_item, ili_item);
}

/*
 * The logged size of an inode fork is always the current size of the inode
 * fork. This means that when an inode fork is relogged, the size of the logged
 * region is determined by the current state, not the combination of the
 * previously logged state + the current state. This is different relogging
 * behaviour to most other log items which will retain the size of the
 * previously logged changes when smaller regions are relogged.
 *
 * Hence operations that remove data from the inode fork (e.g. shortform
 * dir/attr remove, extent form extent removal, etc), the size of the relogged
 * inode gets -smaller- rather than stays the same size as the previously logged
 * size and this can result in the committing transaction reducing the amount of
 * space being consumed by the CIL.
 */
STATIC void
xfs_inode_item_data_fork_size(
	struct xfs_inode_log_item *iip,
	int			*nvecs,
	int			*nbytes)
{
	struct xfs_inode	*ip = iip->ili_inode;

	switch (ip->i_df.if_format) {
	case XFS_DINODE_FMT_EXTENTS:
		if ((iip->ili_fields & XFS_ILOG_DEXT) &&
		    ip->i_df.if_nextents > 0 &&
		    ip->i_df.if_bytes > 0) {
			/* worst case, doesn't subtract delalloc extents */
			*nbytes += XFS_IFORK_DSIZE(ip);
			*nvecs += 1;
		}
		break;
	case XFS_DINODE_FMT_BTREE:
		if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
		    ip->i_df.if_broot_bytes > 0) {
			*nbytes += ip->i_df.if_broot_bytes;
			*nvecs += 1;
		}
		break;
	case XFS_DINODE_FMT_LOCAL:
		if ((iip->ili_fields & XFS_ILOG_DDATA) &&
		    ip->i_df.if_bytes > 0) {
			*nbytes += roundup(ip->i_df.if_bytes, 4);
			*nvecs += 1;
		}
		break;

	case XFS_DINODE_FMT_DEV:
		break;
	default:
		ASSERT(0);
		break;
	}
}

STATIC void
xfs_inode_item_attr_fork_size(
	struct xfs_inode_log_item *iip,
	int			*nvecs,
	int			*nbytes)
{
	struct xfs_inode	*ip = iip->ili_inode;

	switch (ip->i_afp->if_format) {
	case XFS_DINODE_FMT_EXTENTS:
		if ((iip->ili_fields & XFS_ILOG_AEXT) &&
		    ip->i_afp->if_nextents > 0 &&
		    ip->i_afp->if_bytes > 0) {
			/* worst case, doesn't subtract unused space */
			*nbytes += XFS_IFORK_ASIZE(ip);
			*nvecs += 1;
		}
		break;
	case XFS_DINODE_FMT_BTREE:
		if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
		    ip->i_afp->if_broot_bytes > 0) {
			*nbytes += ip->i_afp->if_broot_bytes;
			*nvecs += 1;
		}
		break;
	case XFS_DINODE_FMT_LOCAL:
		if ((iip->ili_fields & XFS_ILOG_ADATA) &&
		    ip->i_afp->if_bytes > 0) {
			*nbytes += roundup(ip->i_afp->if_bytes, 4);
			*nvecs += 1;
		}
		break;
	default:
		ASSERT(0);
		break;
	}
}

/*
 * This returns the number of iovecs needed to log the given inode item.
 *
 * We need one iovec for the inode log format structure, one for the
 * inode core, and possibly one for the inode data/extents/b-tree root
 * and one for the inode attribute data/extents/b-tree root.
 */
STATIC void
xfs_inode_item_size(
	struct xfs_log_item	*lip,
	int			*nvecs,
	int			*nbytes)
{
	struct xfs_inode_log_item *iip = INODE_ITEM(lip);
	struct xfs_inode	*ip = iip->ili_inode;

	*nvecs += 2;
	*nbytes += sizeof(struct xfs_inode_log_format) +
		   xfs_log_dinode_size(ip->i_mount);

	xfs_inode_item_data_fork_size(iip, nvecs, nbytes);
	if (XFS_IFORK_Q(ip))
		xfs_inode_item_attr_fork_size(iip, nvecs, nbytes);
}

STATIC void
xfs_inode_item_format_data_fork(
	struct xfs_inode_log_item *iip,
	struct xfs_inode_log_format *ilf,
	struct xfs_log_vec	*lv,
	struct xfs_log_iovec	**vecp)
{
	struct xfs_inode	*ip = iip->ili_inode;
	size_t			data_bytes;

	switch (ip->i_df.if_format) {
	case XFS_DINODE_FMT_EXTENTS:
		iip->ili_fields &=
			~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT | XFS_ILOG_DEV);

		if ((iip->ili_fields & XFS_ILOG_DEXT) &&
		    ip->i_df.if_nextents > 0 &&
		    ip->i_df.if_bytes > 0) {
			struct xfs_bmbt_rec *p;

			ASSERT(xfs_iext_count(&ip->i_df) > 0);

			p = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_IEXT);
			data_bytes = xfs_iextents_copy(ip, p, XFS_DATA_FORK);
			xlog_finish_iovec(lv, *vecp, data_bytes);

			ASSERT(data_bytes <= ip->i_df.if_bytes);

			ilf->ilf_dsize = data_bytes;
			ilf->ilf_size++;
		} else {
			iip->ili_fields &= ~XFS_ILOG_DEXT;
		}
		break;
	case XFS_DINODE_FMT_BTREE:
		iip->ili_fields &=
			~(XFS_ILOG_DDATA | XFS_ILOG_DEXT | XFS_ILOG_DEV);

		if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
		    ip->i_df.if_broot_bytes > 0) {
			ASSERT(