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_glock_aspace_cachep __read_mostly;
  25 struct kmem_cache *gfs2_inode_cachep __read_mostly;
  26 struct kmem_cache *gfs2_bufdata_cachep __read_mostly;
  27 struct kmem_cache *gfs2_rgrpd_cachep __read_mostly;
  28 struct kmem_cache *gfs2_quotad_cachep __read_mostly;
  29
  30 void gfs2_assert_i(struct gfs2_sbd *sdp)
  31 {
  32         printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
  33                sdp->sd_fsname);
  34 }
  35
  36 int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
  37 {
  38         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
  39         const struct lm_lockops *lm = ls->ls_ops;
  40         va_list args;
  41
  42         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
  43             test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
  44                 return 0;
  45
  46         va_start(args, fmt);
  47         vprintk(fmt, args);
  48         va_end(args);
  49
  50         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
  51                 fs_err(sdp, "about to withdraw this file system\n");
  52                 BUG_ON(sdp->sd_args.ar_debug);
  53
  54                 kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
  55
  56                 if (lm->lm_unmount) {
  57                         fs_err(sdp, "telling LM to unmount\n");
  58                         lm->lm_unmount(sdp);
  59                 }
  60                 fs_err(sdp, "withdrawn\n");
  61                 dump_stack();
  62         }
  63
  64         if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
  65                 panic("GFS2: fsid=%s: panic requested.\n", sdp->sd_fsname);
  66
  67         return -1;
  68 }
  69
  70 /**
  71  * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
  72  * Returns: -1 if this call withdrew the machine,
  73  *          -2 if it was already withdrawn
  74  */
  75
  76 int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
  77                            const char *function, char *file, unsigned int line)
  78 {
  79         int me;
  80         me = gfs2_lm_withdraw(sdp,
  81                 "GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
  82                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  83                 sdp->sd_fsname, assertion,
  84                 sdp->sd_fsname, function, file, line);
  85         dump_stack();
  86         return (me) ? -1 : -2;
  87 }
  88
  89 /**
  90  * gfs2_assert_warn_i - Print a message to the console if @assertion is false
  91  * Returns: -1 if we printed something
  92  *          -2 if we didn't
  93  */
  94
  95 int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
  96                        const char *function, char *file, unsigned int line)
  97 {
  98         if (time_before(jiffies,
  99                         sdp->sd_last_warning +
 100                         gfs2_tune_get(sdp, gt_complain_secs) * HZ))
 101                 return -2;
 102
 103         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
 104                 printk(KERN_WARNING
 105                        "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
 106                        "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 107                        sdp->sd_fsname, assertion,
 108                        sdp->sd_fsname, function, file, line);
 109
 110         if (sdp->sd_args.ar_debug)
 111                 BUG();
 112         else
 113                 dump_stack();
 114
 115         if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
 116                 panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
 117                       "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 118                       sdp->sd_fsname, assertion,
 119                       sdp->sd_fsname, function, file, line);
 120
 121         sdp->sd_last_warning = jiffies;
 122
 123         return -1;
 124 }
 125
 126 /**
 127  * gfs2_consist_i - Flag a filesystem consistency error and withdraw
 128  * Returns: -1 if this call withdrew the machine,
 129  *          0 if it was already withdrawn
 130  */
 131
 132 int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
 133                    char *file, unsigned int line)
 134 {
 135         int rv;
 136         rv = gfs2_lm_withdraw(sdp,
 137                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
 138                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 139                 sdp->sd_fsname,
 140                 sdp->sd_fsname, function, file, line);
 141         return rv;
 142 }
 143
 144 /**
 145  * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
 146  * Returns: -1 if this call withdrew the machine,
 147  *          0 if it was already withdrawn
 148  */
 149
 150 int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
 151                          const char *function, char *file, unsigned int line)
 152 {
 153         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 154         int rv;
 155         rv = gfs2_lm_withdraw(sdp,
 156                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
 157                 "GFS2: fsid=%s:   inode = %llu %llu\n"
 158                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 159                 sdp->sd_fsname,
 160                 sdp->sd_fsname, (unsigned long long)ip->i_no_formal_ino,
 161                 (unsigned long long)ip->i_no_addr,
 162                 sdp->sd_fsname, function, file, line);
 163         return rv;
 164 }
 165
 166 /**
 167  * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
 168  * Returns: -1 if this call withdrew the machine,
 169  *          0 if it was already withdrawn
 170  */
 171
 172 int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
 173                          const char *function, char *file, unsigned int line)
 174 {
 175         struct gfs2_sbd *sdp = rgd->rd_sbd;
 176         int rv;
 177         rv = gfs2_lm_withdraw(sdp,
 178                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
 179                 "GFS2: fsid=%s:   RG = %llu\n"
 180                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 181                 sdp->sd_fsname,
 182                 sdp->sd_fsname, (unsigned long long)rgd->rd_addr,
 183                 sdp->sd_fsname, function, file, line);
 184         return rv;
 185 }
 186
 187 /**
 188  * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
 189  * Returns: -1 if this call withdrew the machine,
 190  *          -2 if it was already withdrawn
 191  */
 192
 193 int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
 194                        const char *type, const char *function, char *file,
 195                        unsigned int line)
 196 {
 197         int me;
 198         me = gfs2_lm_withdraw(sdp,
 199                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
 200                 "GFS2: fsid=%s:   bh = %llu (%s)\n"
 201                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 202                 sdp->sd_fsname,
 203                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type,
 204                 sdp->sd_fsname, function, file, line);
 205         return (me) ? -1 : -2;
 206 }
 207
 208 /**
 209  * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
 210  * Returns: -1 if this call withdrew the machine,
 211  *          -2 if it was already withdrawn
 212  */
 213
 214 int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
 215                            u16 type, u16 t, const char *function,
 216                            char *file, unsigned int line)
 217 {
 218         int me;
 219         me = gfs2_lm_withdraw(sdp,
 220                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
 221                 "GFS2: fsid=%s:   bh = %llu (type: exp=%u, found=%u)\n"
 222                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 223                 sdp->sd_fsname,
 224                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type, t,
 225                 sdp->sd_fsname, function, file, line);
 226         return (me) ? -1 : -2;
 227 }
 228
 229 /**
 230  * gfs2_io_error_i - Flag an I/O error and withdraw
 231  * Returns: -1 if this call withdrew the machine,
 232  *          0 if it was already withdrawn
 233  */
 234
 235 int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
 236                     unsigned int line)
 237 {
 238         int rv;
 239         rv = gfs2_lm_withdraw(sdp,
 240                 "GFS2: fsid=%s: fatal: I/O error\n"
 241                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 242                 sdp->sd_fsname,
 243                 sdp->sd_fsname, function, file, line);
 244         return rv;
 245 }
 246
 247 /**
 248  * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
 249  * Returns: -1 if this call withdrew the machine,
 250  *          0 if it was already withdrawn
 251  */
 252
 253 int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
 254                        const char *function, char *file, unsigned int line)
 255 {
 256         int rv;
 257         rv = gfs2_lm_withdraw(sdp,
 258                 "GFS2: fsid=%s: fatal: I/O error\n"
 259                 "GFS2: fsid=%s:   block = %llu\n"
 260                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 261                 sdp->sd_fsname,
 262                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr,
 263                 sdp->sd_fsname, function, file, line);
 264         return rv;
 265 }
 266
 267 void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
 268                       unsigned int bit, int new_value)
 269 {
 270         unsigned int c, o, b = bit;
 271         int old_value;
 272
 273         c = b / (8 * PAGE_SIZE);
 274         b %= 8 * PAGE_SIZE;
 275         o = b / 8;
 276         b %= 8;
 277
 278         old_value = (bitmap[c][o] & (1 << b));
 279         gfs2_assert_withdraw(sdp, !old_value != !new_value);
 280
 281         if (new_value)
 282                 bitmap[c][o] |= 1 << b;
 283         else
 284                 bitmap[c][o] &= ~(1 << b);
 285 }
 286