fs/gfs2/util.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/crc32.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <asm/uaccess.h>
  17
  18 #include "gfs2.h"
  19 #include "incore.h"
  20 #include "glock.h"
  21 #include "util.h"
  22
  23 struct kmem_cache *gfs2_glock_cachep __read_mostly;
  24 struct kmem_cache *gfs2_inode_cachep __read_mostly;
  25 struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
  26 struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
  27 struct kmem_cache *gfs2_quotad_cachep __read_mostly;
  28
  29 void gfs2_assert_i(struct gfs2_sbd *sdp)
  30 {
  31         printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
  32                sdp->sd_fsname);
  33 }
  34
  35 int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
  36 {
  37         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
  38         const struct lm_lockops *lm = ls->ls_ops;
  39         va_list args;
  40
  41         if (test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
  42                 return 0;
  43
  44         va_start(args, fmt);
  45         vprintk(fmt, args);
  46         va_end(args);
  47
  48         fs_err(sdp, "about to withdraw this file system\n");
  49         BUG_ON(sdp->sd_args.ar_debug);
  50
  51         kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
  52
  53         if (lm->lm_unmount) {
  54                 fs_err(sdp, "telling LM to unmount\n");
  55                 lm->lm_unmount(sdp);
  56         }
  57         fs_err(sdp, "withdrawn\n");
  58         dump_stack();
  59
  60         return -1;
  61 }
  62
  63 /**
  64  * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
  65  * Returns: -1 if this call withdrew the machine,
  66  *          -2 if it was already withdrawn
  67  */
  68
  69 int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
  70                            const char *function, char *file, unsigned int line)
  71 {
  72         int me;
  73         me = gfs2_lm_withdraw(sdp,
  74                 "GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
  75                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  76                 sdp->sd_fsname, assertion,
  77                 sdp->sd_fsname, function, file, line);
  78         dump_stack();
  79         return (me) ? -1 : -2;
  80 }
  81
  82 /**
  83  * gfs2_assert_warn_i - Print a message to the console if @assertion is false
  84  * Returns: -1 if we printed something
  85  *          -2 if we didn't
  86  */
  87
  88 int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
  89                        const char *function, char *file, unsigned int line)
  90 {
  91         if (time_before(jiffies,
  92                         sdp->sd_last_warning +
  93                         gfs2_tune_get(sdp, gt_complain_secs) * HZ))
  94                 return -2;
  95
  96         printk(KERN_WARNING
  97                "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
  98                "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  99                sdp->sd_fsname, assertion,
 100                sdp->sd_fsname, function, file, line);
 101
 102         if (sdp->sd_args.ar_debug)
 103                 BUG();
 104         else
 105                 dump_stack();
 106
 107         sdp->sd_last_warning = jiffies;
 108
 109         return -1;
 110 }
 111
 112 /**
 113  * gfs2_consist_i - Flag a filesystem consistency error and withdraw
 114  * Returns: -1 if this call withdrew the machine,
 115  *          0 if it was already withdrawn
 116  */
 117
 118 int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
 119                    char *file, unsigned int line)
 120 {
 121         int rv;
 122         rv = gfs2_lm_withdraw(sdp,
 123                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
 124                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 125                 sdp->sd_fsname,
 126                 sdp->sd_fsname, function, file, line);
 127         return rv;
 128 }
 129
 130 /**
 131  * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
 132  * Returns: -1 if this call withdrew the machine,
 133  *          0 if it was already withdrawn
 134  */
 135
 136 int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
 137                          const char *function, char *file, unsigned int line)
 138 {
 139         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 140         int rv;
 141         rv = gfs2_lm_withdraw(sdp,
 142                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
 143                 "GFS2: fsid=%s:   inode = %llu %llu\n"
 144                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 145                 sdp->sd_fsname,
 146                 sdp->sd_fsname, (unsigned long long)ip->i_no_formal_ino,
 147                 (unsigned long long)ip->i_no_addr,
 148                 sdp->sd_fsname, function, file, line);
 149         return rv;
 150 }
 151
 152 /**
 153  * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
 154  * Returns: -1 if this call withdrew the machine,
 155  *          0 if it was already withdrawn
 156  */
 157
 158 int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
 159                          const char *function, char *file, unsigned int line)
 160 {
 161         struct gfs2_sbd *sdp = rgd->rd_sbd;
 162         int rv;
 163         rv = gfs2_lm_withdraw(sdp,
 164                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
 165                 "GFS2: fsid=%s:   RG = %llu\n"
 166                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 167                 sdp->sd_fsname,
 168                 sdp->sd_fsname, (unsigned long long)rgd->rd_addr,
 169                 sdp->sd_fsname, function, file, line);
 170         return rv;
 171 }
 172
 173 /**
 174  * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
 175  * Returns: -1 if this call withdrew the machine,
 176  *          -2 if it was already withdrawn
 177  */
 178
 179 int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
 180                        const char *type, const char *function, char *file,
 181                        unsigned int line)
 182 {
 183         int me;
 184         me = gfs2_lm_withdraw(sdp,
 185                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
 186                 "GFS2: fsid=%s:   bh = %llu (%s)\n"
 187                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 188                 sdp->sd_fsname,
 189                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type,
 190                 sdp->sd_fsname, function, file, line);
 191         return (me) ? -1 : -2;
 192 }
 193
 194 /**
 195  * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
 196  * Returns: -1 if this call withdrew the machine,
 197  *          -2 if it was already withdrawn
 198  */
 199
 200 int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
 201                            u16 type, u16 t, const char *function,
 202                            char *file, unsigned int line)
 203 {
 204         int me;
 205         me = gfs2_lm_withdraw(sdp,
 206                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
 207                 "GFS2: fsid=%s:   bh = %llu (type: exp=%u, found=%u)\n"
 208                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 209                 sdp->sd_fsname,
 210                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type, t,
 211                 sdp->sd_fsname, function, file, line);
 212         return (me) ? -1 : -2;
 213 }
 214
 215 /**
 216  * gfs2_io_error_i - Flag an I/O error and withdraw
 217  * Returns: -1 if this call withdrew the machine,
 218  *          0 if it was already withdrawn
 219  */
 220
 221 int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
 222                     unsigned int line)
 223 {
 224         int rv;
 225         rv = gfs2_lm_withdraw(sdp,
 226                 "GFS2: fsid=%s: fatal: I/O error\n"
 227                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 228                 sdp->sd_fsname,
 229                 sdp->sd_fsname, function, file, line);
 230         return rv;
 231 }
 232
 233 /**
 234  * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
 235  * Returns: -1 if this call withdrew the machine,
 236  *          0 if it was already withdrawn
 237  */
 238
 239 int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
 240                        const char *function, char *file, unsigned int line)
 241 {
 242         int rv;
 243         rv = gfs2_lm_withdraw(sdp,
 244                 "GFS2: fsid=%s: fatal: I/O error\n"
 245                 "GFS2: fsid=%s:   block = %llu\n"
 246                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 247                 sdp->sd_fsname,
 248                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr,
 249                 sdp->sd_fsname, function, file, line);
 250         return rv;
 251 }
 252
 253 void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
 254                       unsigned int bit, int new_value)
 255 {
 256         unsigned int c, o, b = bit;
 257         int old_value;
 258
 259         c = b / (8 * PAGE_SIZE);
 260         b %= 8 * PAGE_SIZE;
 261         o = b / 8;
 262         b %= 8;
 263
 264         old_value = (bitmap[c][o] & (1 << b));
 265         gfs2_assert_withdraw(sdp, !old_value != !new_value);
 266
 267         if (new_value)
 268                 bitmap[c][o] |= 1 << b;
 269         else
 270                 bitmap[c][o] &= ~(1 << b);
 271 }
 272