/*
 * 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/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/crc32.h>
#include <linux/gfs2_ondisk.h>
#include <asm/uaccess.h>

#include "gfs2.h"
#include "incore.h"
#include "glock.h"
#include "util.h"

struct kmem_cache *gfs2_glock_cachep __read_mostly;
struct kmem_cache *gfs2_glock_aspace_cachep __read_mostly;
struct kmem_cache *gfs2_inode_cachep __read_mostly;
struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
struct kmem_cache *gfs2_quotad_cachep __read_mostly;
struct kmem_cache *gfs2_rsrv_cachep __read_mostly;
mempool_t *gfs2_page_pool __read_mostly;

void gfs2_assert_i(struct gfs2_sbd *sdp)
{
        printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
               sdp->sd_fsname);
}

int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
{
        struct lm_lockstruct *ls = &sdp->sd_lockstruct;
        const struct lm_lockops *lm = ls->ls_ops;
        va_list args;

        if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
            test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
                return 0;

        va_start(args, fmt);
        vprintk(fmt, args);
        va_end(args);

        if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
                fs_err(sdp, "about to withdraw this file system\n");
                BUG_ON(sdp->sd_args.ar_debug);

                kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);

                if (!strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
                        wait_for_completion(&sdp->sd_wdack);

                if (lm->lm_unmount) {
                        fs_err(sdp, "telling LM to unmount\n");
                        lm->lm_unmount(sdp);
                }
                fs_err(sdp, "withdrawn\n");
                dump_stack();
        }

        if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
                panic("GFS2: fsid=%s: panic requested.\n", sdp->sd_fsname);

        return -1;
}

/**
 * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
 * Returns: -1 if this call withdrew the machine,
 *          -2 if it was already withdrawn
 */

int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
                           const char *function, char *file, unsigned int line)
{
        int me;
        me = gfs2_lm_withdraw(sdp,
                "GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
                "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
                sdp->sd_fsname, assertion,
                sdp->sd_fsname, function, file, line);
        dump_stack();
        return (me) ? -1 : -2;
}

/**
 * gfs2_assert_warn_i - Print a message to the console if @assertion is false
 * Returns: -1 if we printed something
 *          -2 if we didn't
 */

int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
                       const char *function, char *file, unsigned int line)
{
        if (time_before(jiffies,
                        sdp->sd_last_warning +
                        gfs2_tune_get(sdp, gt_complain_secs) * HZ))
                return -2;

        if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
                printk(KERN_WARNING
                       "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
                       "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
                       sdp->sd_fsname, assertion,
                       sdp->sd_fsname, function, file, line);

        if (sdp->sd_args.ar_debug)
                BUG();
        else
                dump_stack();

        if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
                panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
                      "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
                      sdp->sd_fsname, assertion,
                      sdp->sd_fsname, function, file, line);

        sdp->sd_last_warning = jiffies;

        return -1;
}

/**
 * gfs2_consist_i - Flag a filesystem consistency error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          0 if it was already withdrawn
 */

int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
                   char *file, unsigned int line)
{
        int rv;
        rv = gfs2_lm_withdraw(sdp,
                "GFS2: fsid=%s: fatal: filesystem consistency error\n"
                "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
                sdp->sd_fsname,
                sdp->sd_fsname, function, file, line);
        return rv;
}

/**
 * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          0 if it was already withdrawn
 */

int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
                         const char *function, char *file, unsigned int line)
{
        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
        int rv;
        rv = gfs2_lm_withdraw(sdp,
                "GFS2: fsid=%s: fatal: filesystem consistency error\n"
                "GFS2: fsid=%s:   inode = %llu %llu\n"
                "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
                sdp->sd_fsname,
                sdp->sd_fsname, (unsigned long long)ip->i_no_formal_ino,
                (unsigned long long)ip->i_no_addr,
                sdp->sd_fsname, function, file, line);
        return rv;
}

/**
 * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          0 if it was already withdrawn
 */

int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
                         const char *function, char *file, unsigned int line)
{
        struct gfs2_sbd *sdp = rgd->rd_sbd;
        int rv;
        rv = gfs2_lm_withdraw(sdp,
                "GFS2: fsid=%s: fatal: filesystem consistency error\n"
                "GFS2: fsid=%s:   RG = %llu\n"
                "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
                sdp->sd_fsname,
                sdp->sd_fsname, (unsigned long long)rgd->rd_addr,
                sdp->sd_fsname, function, file, line);
        return rv;
}

/**
 * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          -2 if it was already withdrawn
 */

int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
                       const char *type, const char *function, char *file,
                       unsigned int line)
{
        int me;
        me = gfs2_lm_withdraw(sdp,
                "GFS2: fsid=%s: fatal: invalid metadata block\n"
                "GFS2: fsid=%s:   bh = %llu (%s)\n"
                "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
                sdp->sd_fsname,
                sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type,
                sdp->sd_fsname, function, file, line);
        return (me) ? -1 : -2;
}

/**
 * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          -2 if it was already withdrawn
 */

int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
                           u16 type, u16 t, const char *function,
                           char *file, unsigned int line)
{
        int me;
        me = gfs2_lm_withdraw(sdp,
                "GFS2: fsid=%s: fatal: invalid metadata block\n"
                "GFS2: fsid=%s:   bh = %llu (type: exp=%u, found=%u)\n"
                "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
                sdp->sd_fsname,
                sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type, t,
                sdp->sd_fsname, function, file, line);
        return (me) ? -1 : -2;
}

/**
 * gfs2_io_error_i - Flag an I/O error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          0 if it was already withdrawn
 */

int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
                    unsigned int line)
{
        int rv;
        rv = gfs2_lm_withdraw(sdp,
                "GFS2: fsid=%s: fatal: I/O error\n"
                "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
                sdp->sd_fsname,
                sdp->sd_fsname, function, file, line);
        return rv;
}

/**
 * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
 * Returns: -1 if this call withdrew the machine,
 *          0 if it was already withdrawn
 */

int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
                       const char *function, char *file, unsigned int line)
{
        int rv;
        rv = gfs2_lm_withdraw(sdp,
                "GFS2: fsid=%s: fatal: I/O error\n"
                "GFS2: fsid=%s:   block = %llu\n"
                "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
                sdp->sd_fsname,
                sdp->sd_fsname, (unsigned long long)bh->b_blocknr,
                sdp->sd_fsname, function, file, line);
        return rv;
}

void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
                      unsigned int bit, int new_value)
{
        unsigned int c, o, b = bit;
        int old_value;

        c = b / (8 * PAGE_SIZE);
        b %= 8 * PAGE_SIZE;
        o = b / 8;
        b %= 8;

        old_value = (bitmap[c][o] & (1 << b));
        gfs2_assert_withdraw(sdp, !old_value != !new_value);

        if (new_value)
                bitmap[c][o] |= 1 << b;
        else
                bitmap[c][o] &= ~(1 << b);
}