fs/gfs2/util.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2005 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 v.2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/crc32.h>
  16 #include <asm/semaphore.h>
  17 #include <asm/uaccess.h>
  18
  19 #include "gfs2.h"
  20 #include "glock.h"
  21 #include "lm.h"
  22
  23 kmem_cache_t *gfs2_glock_cachep __read_mostly;
  24 kmem_cache_t *gfs2_inode_cachep __read_mostly;
  25 kmem_cache_t *gfs2_bufdata_cachep __read_mostly;
  26
  27 uint32_t gfs2_disk_hash(const char *data, int len)
  28 {
  29         return crc32_le(0xFFFFFFFF, data, len) ^ 0xFFFFFFFF;
  30 }
  31
  32 void gfs2_assert_i(struct gfs2_sbd *sdp)
  33 {
  34         printk(KERN_EMERG "GFS2: fsid=%s: fatal assertion failed\n",
  35                sdp->sd_fsname);
  36 }
  37
  38 /**
  39  * gfs2_assert_withdraw_i - Cause the machine to withdraw if @assertion is false
  40  * Returns: -1 if this call withdrew the machine,
  41  *          -2 if it was already withdrawn
  42  */
  43
  44 int gfs2_assert_withdraw_i(struct gfs2_sbd *sdp, char *assertion,
  45                            const char *function, char *file, unsigned int line)
  46 {
  47         int me;
  48         me = gfs2_lm_withdraw(sdp,
  49                 "GFS2: fsid=%s: fatal: assertion \"%s\" failed\n"
  50                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  51                 sdp->sd_fsname, assertion,
  52                 sdp->sd_fsname, function, file, line);
  53         return (me) ? -1 : -2;
  54 }
  55
  56 /**
  57  * gfs2_assert_warn_i - Print a message to the console if @assertion is false
  58  * Returns: -1 if we printed something
  59  *          -2 if we didn't
  60  */
  61
  62 int gfs2_assert_warn_i(struct gfs2_sbd *sdp, char *assertion,
  63                        const char *function, char *file, unsigned int line)
  64 {
  65         if (time_before(jiffies,
  66                         sdp->sd_last_warning +
  67                         gfs2_tune_get(sdp, gt_complain_secs) * HZ))
  68                 return -2;
  69
  70         printk(KERN_WARNING
  71                "GFS2: fsid=%s: warning: assertion \"%s\" failed\n"
  72                "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  73                sdp->sd_fsname, assertion,
  74                sdp->sd_fsname, function, file, line);
  75
  76         if (sdp->sd_args.ar_debug)
  77                 BUG();
  78
  79         sdp->sd_last_warning = jiffies;
  80
  81         return -1;
  82 }
  83
  84 /**
  85  * gfs2_consist_i - Flag a filesystem consistency error and withdraw
  86  * Returns: -1 if this call withdrew the machine,
  87  *          0 if it was already withdrawn
  88  */
  89
  90 int gfs2_consist_i(struct gfs2_sbd *sdp, int cluster_wide, const char *function,
  91                    char *file, unsigned int line)
  92 {
  93         int rv;
  94         rv = gfs2_lm_withdraw(sdp,
  95                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
  96                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
  97                 sdp->sd_fsname,
  98                 sdp->sd_fsname, function, file, line);
  99         return rv;
 100 }
 101
 102 /**
 103  * gfs2_consist_inode_i - Flag an inode consistency error and withdraw
 104  * Returns: -1 if this call withdrew the machine,
 105  *          0 if it was already withdrawn
 106  */
 107
 108 int gfs2_consist_inode_i(struct gfs2_inode *ip, int cluster_wide,
 109                          const char *function, char *file, unsigned int line)
 110 {
 111         struct gfs2_sbd *sdp = ip->i_sbd;
 112         int rv;
 113         rv = gfs2_lm_withdraw(sdp,
 114                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
 115                 "GFS2: fsid=%s:   inode = %llu %llu\n"
 116                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 117                 sdp->sd_fsname,
 118                 sdp->sd_fsname, ip->i_num.no_formal_ino, ip->i_num.no_addr,
 119                 sdp->sd_fsname, function, file, line);
 120         return rv;
 121 }
 122
 123 /**
 124  * gfs2_consist_rgrpd_i - Flag a RG consistency error and withdraw
 125  * Returns: -1 if this call withdrew the machine,
 126  *          0 if it was already withdrawn
 127  */
 128
 129 int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
 130                          const char *function, char *file, unsigned int line)
 131 {
 132         struct gfs2_sbd *sdp = rgd->rd_sbd;
 133         int rv;
 134         rv = gfs2_lm_withdraw(sdp,
 135                 "GFS2: fsid=%s: fatal: filesystem consistency error\n"
 136                 "GFS2: fsid=%s:   RG = %llu\n"
 137                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 138                 sdp->sd_fsname,
 139                 sdp->sd_fsname, rgd->rd_ri.ri_addr,
 140                 sdp->sd_fsname, function, file, line);
 141         return rv;
 142 }
 143
 144 /**
 145  * gfs2_meta_check_ii - Flag a magic number consistency error and withdraw
 146  * Returns: -1 if this call withdrew the machine,
 147  *          -2 if it was already withdrawn
 148  */
 149
 150 int gfs2_meta_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
 151                        const char *type, const char *function, char *file,
 152                        unsigned int line)
 153 {
 154         int me;
 155         me = gfs2_lm_withdraw(sdp,
 156                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
 157                 "GFS2: fsid=%s:   bh = %llu (%s)\n"
 158                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 159                 sdp->sd_fsname,
 160                 sdp->sd_fsname, (uint64_t)bh->b_blocknr, type,
 161                 sdp->sd_fsname, function, file, line);
 162         return (me) ? -1 : -2;
 163 }
 164
 165 /**
 166  * gfs2_metatype_check_ii - Flag a metadata type consistency error and withdraw
 167  * Returns: -1 if this call withdrew the machine,
 168  *          -2 if it was already withdrawn
 169  */
 170
 171 int gfs2_metatype_check_ii(struct gfs2_sbd *sdp, struct buffer_head *bh,
 172                            uint16_t type, uint16_t t, const char *function,
 173                            char *file, unsigned int line)
 174 {
 175         int me;
 176         me = gfs2_lm_withdraw(sdp,
 177                 "GFS2: fsid=%s: fatal: invalid metadata block\n"
 178                 "GFS2: fsid=%s:   bh = %llu (type: exp=%u, found=%u)\n"
 179                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 180                 sdp->sd_fsname,
 181                 sdp->sd_fsname, (uint64_t)bh->b_blocknr, type, t,
 182                 sdp->sd_fsname, function, file, line);
 183         return (me) ? -1 : -2;
 184 }
 185
 186 /**
 187  * gfs2_io_error_i - Flag an I/O error and withdraw
 188  * Returns: -1 if this call withdrew the machine,
 189  *          0 if it was already withdrawn
 190  */
 191
 192 int gfs2_io_error_i(struct gfs2_sbd *sdp, const char *function, char *file,
 193                     unsigned int line)
 194 {
 195         int rv;
 196         rv = gfs2_lm_withdraw(sdp,
 197                 "GFS2: fsid=%s: fatal: I/O error\n"
 198                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 199                 sdp->sd_fsname,
 200                 sdp->sd_fsname, function, file, line);
 201         return rv;
 202 }
 203
 204 /**
 205  * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
 206  * Returns: -1 if this call withdrew the machine,
 207  *          0 if it was already withdrawn
 208  */
 209
 210 int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
 211                        const char *function, char *file, unsigned int line)
 212 {
 213         int rv;
 214         rv = gfs2_lm_withdraw(sdp,
 215                 "GFS2: fsid=%s: fatal: I/O error\n"
 216                 "GFS2: fsid=%s:   block = %llu\n"
 217                 "GFS2: fsid=%s:   function = %s, file = %s, line = %u\n",
 218                 sdp->sd_fsname,
 219                 sdp->sd_fsname, (uint64_t)bh->b_blocknr,
 220                 sdp->sd_fsname, function, file, line);
 221         return rv;
 222 }
 223
 224 void gfs2_icbit_munge(struct gfs2_sbd *sdp, unsigned char **bitmap,
 225                       unsigned int bit, int new_value)
 226 {
 227         unsigned int c, o, b = bit;
 228         int old_value;
 229
 230         c = b / (8 * PAGE_SIZE);
 231         b %= 8 * PAGE_SIZE;
 232         o = b / 8;
 233         b %= 8;
 234
 235         old_value = (bitmap[c][o] & (1 << b));
 236         gfs2_assert_withdraw(sdp, !old_value != !new_value);
 237
 238         if (new_value)
 239                 bitmap[c][o] |= 1 << b;
 240         else
 241                 bitmap[c][o] &= ~(1 << b);
 242 }
 243