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/spinlock.h>
  11 #include <linux/completion.h>
  12 #include <linux/buffer_head.h>
  13 #include <linux/crc32.h>
  14 #include <linux/gfs2_ondisk.h>
  15 #include <asm/uaccess.h>
  16
  17 #include "gfs2.h"
  18 #include "incore.h"
  19 #include "glock.h"
  20 #include "util.h"
  21
  22 struct kmem_cache *gfs2_glock_cachep __read_mostly;
  23 struct kmem_cache *gfs2_glock_aspace_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 struct kmem_cache *gfs2_rsrv_cachep __read_mostly;
  29 mempool_t *gfs2_page_pool __read_mostly;
  30
  31 void gfs2_assert_i(struct gfs2_sbd *sdp)
  32 {
  33         printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
  34                sdp->sd_fsname);
  35 }
  36
  37 int gfs2_lm_withdraw(struct gfs2_sbd *sdp, char *fmt, ...)
  38 {
  39         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
  40         const struct lm_lockops *lm = ls->ls_ops;
  41         va_list args;
  42
  43         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW &&
  44             test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
  45                 return 0;
  46
  47         va_start(args, fmt);
  48         vprintk(fmt, args);
  49         va_end(args);
  50
  51         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
  52                 fs_err(sdp, "about to withdraw this file system\n");
  53                 BUG_ON(sdp->sd_args.ar_debug);
  54
  55                 kobject_uevent(&sdp->sd_kobj, KOBJ_OFFLINE);
  56
  57                 if (lm->lm_unmount) {
  58                         fs_err(sdp, "telling LM to unmount\n");
  59                         lm->lm_unmount(sdp);
  60                 }
  61                 fs_err(sdp, "withdrawn\n");
  62                 dump_stack();
  63         }
  64
  65         if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
  66                 panic("GFS2: fsid=%s: panic requested.\n", sdp->sd_fsname);
  67
  68         return -1;
  69 }
  70
  71 /**
  72  * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
  73  * Returns: -1 if this call withdrew the machine,
  74  *          -2 if it was already withdrawn
  75  */
  76
  77 int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
  78                            const char *function, char *file, unsigned int line)
  79 {
  80         int me;
  81         me = gfs2_lm_withdraw(sdp,
  82                 "GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
  83                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  84                 sdp->sd_fsname, assertion,
  85                 sdp->sd_fsname, function, file, line);
  86         dump_stack();
  87         return (me) ? -1 : -2;
  88 }
  89
  90 /**
  91  * gfs2_assert_warn_i - Print a message to the console if @assertion is false
  92  * Returns: -1 if we printed something
  93  *          -2 if we didn't
  94  */
  95
  96 int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
  97                        const char *function, char *file, unsigned int line)
  98 {
  99         if (time_before(jiffies,
 100                         sdp->sd_last_warning +
 101                         gfs2_tune_get(sdp, gt_complain_secs) * HZ))
 102                 return -2;
 103
 104         if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW)
 105                 printk(KERN_WARNING
 106                        "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
 107                        "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 108                        sdp->sd_fsname, assertion,
 109                        sdp->sd_fsname, function, file, line);
 110
 111         if (sdp->sd_args.ar_debug)
 112                 BUG();
 113         else
 114                 dump_stack();
 115
 116         if (sdp->sd_args.ar_errors == GFS2_ERRORS_PANIC)
 117                 panic("GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
 118                       "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 119                       sdp->sd_fsname, assertion,
 120                       sdp->sd_fsname, function, file, line);
 121
 122         sdp->sd_last_warning = jiffies;
 123
 124         return -1;
 125 }
 126
 127 /**
 128  * gfs2_consist_i - Flag a filesystem consistency error and withdraw
 129  * Returns: -1 if this call withdrew the machine,
 130  *          0 if it was already withdrawn
 131  */
 132
 133 int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
 134                    char *file, unsigned int line)
 135 {
 136         int rv;
 137         rv = gfs2_lm_withdraw(sdp,
 138                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
 139                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 140                 sdp->sd_fsname,
 141                 sdp->sd_fsname, function, file, line);
 142         return rv;
 143 }
 144
 145 /**
 146  * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
 147  * Returns: -1 if this call withdrew the machine,
 148  *          0 if it was already withdrawn
 149  */
 150
 151 int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
 152                          const char *function, char *file, unsigned int line)
 153 {
 154         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 155         int rv;
 156         rv = gfs2_lm_withdraw(sdp,
 157                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
 158                 "GFS2: fsid=%s:   inode = %llu %llu\n"
 159                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 160                 sdp->sd_fsname,
 161                 sdp->sd_fsname, (unsigned long long)ip->i_no_formal_ino,
 162                 (unsigned long long)ip->i_no_addr,
 163                 sdp->sd_fsname, function, file, line);
 164         return rv;
 165 }
 166
 167 /**
 168  * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
 169  * Returns: -1 if this call withdrew the machine,
 170  *          0 if it was already withdrawn
 171  */
 172
 173 int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
 174                          const char *function, char *file, unsigned int line)
 175 {
 176         struct gfs2_sbd *sdp = rgd->rd_sbd;
 177         int rv;
 178         rv = gfs2_lm_withdraw(sdp,
 179                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
 180                 "GFS2: fsid=%s:   RG = %llu\n"
 181                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 182                 sdp->sd_fsname,
 183                 sdp->sd_fsname, (unsigned long long)rgd->rd_addr,
 184                 sdp->sd_fsname, function, file, line);
 185         return rv;
 186 }
 187
 188 /**
 189  * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
 190  * Returns: -1 if this call withdrew the machine,
 191  *          -2 if it was already withdrawn
 192  */
 193
 194 int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
 195                        const char *type, const char *function, char *file,
 196                        unsigned int line)
 197 {
 198         int me;
 199         me = gfs2_lm_withdraw(sdp,
 200                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
 201                 "GFS2: fsid=%s:   bh = %llu (%s)\n"
 202                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 203                 sdp->sd_fsname,
 204                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type,
 205                 sdp->sd_fsname, function, file, line);
 206         return (me) ? -1 : -2;
 207 }
 208
 209 /**
 210  * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
 211  * Returns: -1 if this call withdrew the machine,
 212  *          -2 if it was already withdrawn
 213  */
 214
 215 int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
 216                            u16 type, u16 t, const char *function,
 217                            char *file, unsigned int line)
 218 {
 219         int me;
 220         me = gfs2_lm_withdraw(sdp,
 221                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
 222                 "GFS2: fsid=%s:   bh = %llu (type: exp=%u, found=%u)\n"
 223                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 224                 sdp->sd_fsname,
 225                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr, type, t,
 226                 sdp->sd_fsname, function, file, line);
 227         return (me) ? -1 : -2;
 228 }
 229
 230 /**
 231  * gfs2_io_error_i - Flag an I/O error and withdraw
 232  * Returns: -1 if this call withdrew the machine,
 233  *          0 if it was already withdrawn
 234  */
 235
 236 int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
 237                     unsigned int line)
 238 {
 239         int rv;
 240         rv = gfs2_lm_withdraw(sdp,
 241                 "GFS2: fsid=%s: fatal: I/O error\n"
 242                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 243                 sdp->sd_fsname,
 244                 sdp->sd_fsname, function, file, line);
 245         return rv;
 246 }
 247
 248 /**
 249  * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
 250  * Returns: -1 if this call withdrew the machine,
 251  *          0 if it was already withdrawn
 252  */
 253
 254 int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
 255                        const char *function, char *file, unsigned int line)
 256 {
 257         int rv;
 258         rv = gfs2_lm_withdraw(sdp,
 259                 "GFS2: fsid=%s: fatal: I/O error\n"
 260                 "GFS2: fsid=%s:   block = %llu\n"
 261                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 262                 sdp->sd_fsname,
 263                 sdp->sd_fsname, (unsigned long long)bh->b_blocknr,
 264                 sdp->sd_fsname, function, file, line);
 265         return rv;
 266 }
 267
 268 void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
 269                       unsigned int bit, int new_value)
 270 {
 271         unsigned int c, o, b = bit;
 272         int old_value;
 273
 274         c = b / (8 * PAGE_SIZE);
 275         b %= 8 * PAGE_SIZE;
 276         o = b / 8;
 277         b %= 8;
 278
 279         old_value = (bitmap[c][o] & (1 << b));
 280         gfs2_assert_withdraw(sdp, !old_value != !new_value);
 281
 282         if (new_value)
 283                 bitmap[c][o] |= 1 << b;
 284         else
 285                 bitmap[c][o] &= ~(1 << b);
 286 }
 287