path: root/fs/gfs2/super.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/crc32.h>
#include <linux/gfs2_ondisk.h>
#include <linux/bio.h>
#include <linux/lm_interface.h>

#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
#include "dir.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "log.h"
#include "meta_io.h"
#include "quota.h"
#include "recovery.h"
#include "rgrp.h"
#include "super.h"
#include "trans.h"
#include "util.h"

static const u32 gfs2_old_fs_formats[] = {
        0
};

static const u32 gfs2_old_multihost_formats[] = {
        0
};

/**
 * gfs2_tune_init - Fill a gfs2_tune structure with default values
 * @gt: tune
 *
 */

void gfs2_tune_init(struct gfs2_tune *gt)
{
	spin_lock_init(&gt->gt_spin);

	gt->gt_ilimit = 100;
	gt->gt_ilimit_tries = 3;
	gt->gt_ilimit_min = 1;
	gt->gt_demote_secs = 300;
	gt->gt_incore_log_blocks = 1024;
	gt->gt_log_flush_secs = 60;
	gt->gt_jindex_refresh_secs = 60;
	gt->gt_scand_secs = 15;
	gt->gt_recoverd_secs = 60;
	gt->gt_logd_secs = 1;
	gt->gt_quotad_secs = 5;
	gt->gt_quota_simul_sync = 64;
	gt->gt_quota_warn_period = 10;
	gt->gt_quota_scale_num = 1;
	gt->gt_quota_scale_den = 1;
	gt->gt_quota_cache_secs = 300;
	gt->gt_quota_quantum = 60;
	gt->gt_atime_quantum = 3600;
	gt->gt_new_files_jdata = 0;
	gt->gt_new_files_directio = 0;
	gt->gt_max_atomic_write = 4 << 20;
	gt->gt_max_readahead = 1 << 18;
	gt->gt_lockdump_size = 131072;
	gt->gt_stall_secs = 600;
	gt->gt_complain_secs = 10;
	gt->gt_reclaim_limit = 5000;
	gt->gt_entries_per_readdir = 32;
	gt->gt_prefetch_secs = 10;
	gt->gt_greedy_default = HZ / 10;
	gt->gt_greedy_quantum = HZ / 40;
	gt->gt_greedy_max = HZ / 4;
	gt->gt_statfs_quantum = 30;
	gt->gt_statfs_slow = 0;
}

/**
 * gfs2_check_sb - Check superblock
 * @sdp: the filesystem
 * @sb: The superblock
 * @silent: Don't print a message if the check fails
 *
 * Checks the version code of the FS is one that we understand how to
 * read and that the sizes of the various on-disk structures have not
 * changed.
 */

int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
{
	unsigned int x;

	if (sb->sb_header.mh_magic != GFS2_MAGIC ||
	    sb->sb_header.mh_type != GFS2_METATYPE_SB) {
		if (!silent)
			printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
		return -EINVAL;
	}

	/*  If format numbers match exactly, we're done.  */

	if (sb->sb_fs_format == GFS2_FORMAT_FS &&
	    sb->sb_multihost_format == GFS2_FORMAT_MULTI)
		return 0;

	if (sb->sb_fs_format != GFS2_FORMAT_FS) {
		for (x = 0; gfs2_old_fs_formats[x]; x++)
			if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
				break;

		if (!gfs2_old_fs_formats[x]) {
			printk(KERN_WARNING
			       "GFS2: code version (%u, %u) is incompatible "
			       "with ondisk format (%u, %u)\n",
			       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
			       sb->sb_fs_format, sb->sb_multihost_format);
			printk(KERN_WARNING
			       "GFS2: I don't know how to upgrade this FS\n");
			return -EINVAL;
		}
	}

	if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
		for (x = 0; gfs2_old_multihost_formats[x]; x++)
			if (gfs2_old_multihost_formats[x] ==
			    sb->sb_multihost_format)
				break;

		if (!gfs2_old_multihost_formats[x]) {
			printk(KERN_WARNING
			       "GFS2: code version (%u, %u) is incompatible "
			       "with ondisk format (%u, %u)\n",
			       GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
			       sb->sb_fs_format, sb->sb_multihost_format);
			printk(KERN_WARNING
			       "GFS2: I don't know how to upgrade this FS\n");
			return -EINVAL;
		}
	}

	if (!sdp->sd_args.ar_upgrade) {
		printk(KERN_WARNING
		       "GFS2: code version (%u, %u) is incompatible "
		       "with ondisk format (%u, %u)\n",