linux/fs/jfs/resize.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) International Business Machines  Corp., 2000-2004
*/

#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/quotaops.h>
#include <linux/blkdev.h>
#include "jfs_incore.h"
#include "jfs_filsys.h"
#include "jfs_metapage.h"
#include "jfs_dinode.h"
#include "jfs_imap.h"
#include "jfs_dmap.h"
#include "jfs_superblock.h"
#include "jfs_txnmgr.h"
#include "jfs_debug.h"

#define BITSPERPAGE …
#define L2MEGABYTE …
#define MEGABYTE …
#define MEGABYTE32 …

/* convert block number to bmap file page number */
#define BLKTODMAPN(b) …

/*
 *	jfs_extendfs()
 *
 * function: extend file system;
 *
 *   |-------------------------------|----------|----------|
 *   file system space               fsck       inline log
 *                                   workspace  space
 *
 * input:
 *	new LVSize: in LV blocks (required)
 *	new LogSize: in LV blocks (optional)
 *	new FSSize: in LV blocks (optional)
 *
 * new configuration:
 * 1. set new LogSize as specified or default from new LVSize;
 * 2. compute new FSCKSize from new LVSize;
 * 3. set new FSSize as MIN(FSSize, LVSize-(LogSize+FSCKSize)) where
 *    assert(new FSSize >= old FSSize),
 *    i.e., file system must not be shrunk;
 */
int jfs_extendfs(struct super_block *sb, s64 newLVSize, int newLogSize)
{ … }