util.c

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/*
 * 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 (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        fs_err(sdp, "withdrawn\n");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;
}

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;
}

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;
}

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;
}

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;
}

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;
}

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;
}

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;
}

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;
}

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);
}