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  59                 fs_err(sdp, "withdrawn\n");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  72  *          -2 if it was already withdrawn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