git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/error.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "bcachefs.h"
   3 #include "error.h"
   4 #include "io.h"
   5 #include "super.h"
   6
   7 #define FSCK_ERR_RATELIMIT_NR   10
   8
   9 bool bch2_inconsistent_error(struct bch_fs *c)
  10 {
  11         set_bit(BCH_FS_ERROR, &c->flags);
  12
  13         switch (c->opts.errors) {
  14         case BCH_ON_ERROR_continue:
  15                 return false;
  16         case BCH_ON_ERROR_ro:
  17                 if (bch2_fs_emergency_read_only(c))
  18                         bch_err(c, "inconsistency detected - emergency read only");
  19                 return true;
  20         case BCH_ON_ERROR_panic:
  21                 panic(bch2_fmt(c, "panic after error"));
  22                 return true;
  23         default:
  24                 BUG();
  25         }
  26 }
  27
  28 void bch2_topology_error(struct bch_fs *c)
  29 {
  30         set_bit(BCH_FS_TOPOLOGY_ERROR, &c->flags);
  31         if (test_bit(BCH_FS_FSCK_DONE, &c->flags))
  32                 bch2_inconsistent_error(c);
  33 }
  34
  35 void bch2_fatal_error(struct bch_fs *c)
  36 {
  37         if (bch2_fs_emergency_read_only(c))
  38                 bch_err(c, "fatal error - emergency read only");
  39 }
  40
  41 void bch2_io_error_work(struct work_struct *work)
  42 {
  43         struct bch_dev *ca = container_of(work, struct bch_dev, io_error_work);
  44         struct bch_fs *c = ca->fs;
  45         bool dev;
  46
  47         down_write(&c->state_lock);
  48         dev = bch2_dev_state_allowed(c, ca, BCH_MEMBER_STATE_ro,
  49                                     BCH_FORCE_IF_DEGRADED);
  50         if (dev
  51             ? __bch2_dev_set_state(c, ca, BCH_MEMBER_STATE_ro,
  52                                   BCH_FORCE_IF_DEGRADED)
  53             : bch2_fs_emergency_read_only(c))
  54                 bch_err(ca,
  55                         "too many IO errors, setting %s RO",
  56                         dev ? "device" : "filesystem");
  57         up_write(&c->state_lock);
  58 }
  59
  60 void bch2_io_error(struct bch_dev *ca)
  61 {
  62         //queue_work(system_long_wq, &ca->io_error_work);
  63 }
  64
  65 enum ask_yn {
  66         YN_NO,
  67         YN_YES,
  68         YN_ALLNO,
  69         YN_ALLYES,
  70 };
  71
  72 #ifdef __KERNEL__
  73 #define bch2_fsck_ask_yn()      YN_NO
  74 #else
  75
  76 #include "tools-util.h"
  77
  78 enum ask_yn bch2_fsck_ask_yn(void)
  79 {
  80         char *buf = NULL;
  81         size_t buflen = 0;
  82         bool ret;
  83
  84         while (true) {
  85                 fputs(" (y,n, or Y,N for all errors of this type) ", stdout);
  86                 fflush(stdout);
  87
  88                 if (getline(&buf, &buflen, stdin) < 0)
  89                         die("error reading from standard input");
  90
  91                 strim(buf);
  92                 if (strlen(buf) != 1)
  93                         continue;
  94
  95                 switch (buf[0]) {
  96                 case 'n':
  97                         return YN_NO;
  98                 case 'y':
  99                         return YN_YES;
 100                 case 'N':
 101                         return YN_ALLNO;
 102                 case 'Y':
 103                         return YN_ALLYES;
 104                 }
 105         }
 106
 107         free(buf);
 108         return ret;
 109 }
 110
 111 #endif
 112
 113 static struct fsck_err_state *fsck_err_get(struct bch_fs *c, const char *fmt)
 114 {
 115         struct fsck_err_state *s;
 116
 117         if (test_bit(BCH_FS_FSCK_DONE, &c->flags))
 118                 return NULL;
 119
 120         list_for_each_entry(s, &c->fsck_errors, list)
 121                 if (s->fmt == fmt) {
 122                         /*
 123                          * move it to the head of the list: repeated fsck errors
 124                          * are common
 125                          */
 126                         list_move(&s->list, &c->fsck_errors);
 127                         return s;
 128                 }
 129
 130         s = kzalloc(sizeof(*s), GFP_NOFS);
 131         if (!s) {
 132                 if (!c->fsck_alloc_err)
 133                         bch_err(c, "kmalloc err, cannot ratelimit fsck errs");
 134                 c->fsck_alloc_err = true;
 135                 return NULL;
 136         }
 137
 138         INIT_LIST_HEAD(&s->list);
 139         s->fmt = fmt;
 140         list_add(&s->list, &c->fsck_errors);
 141         return s;
 142 }
 143
 144 int bch2_fsck_err(struct bch_fs *c, unsigned flags, const char *fmt, ...)
 145 {
 146         struct fsck_err_state *s = NULL;
 147         va_list args;
 148         bool print = true, suppressing = false, inconsistent = false;
 149         struct printbuf buf = PRINTBUF, *out = &buf;
 150         int ret = -BCH_ERR_fsck_ignore;
 151
 152         va_start(args, fmt);
 153         prt_vprintf(out, fmt, args);
 154         va_end(args);
 155
 156         mutex_lock(&c->fsck_error_lock);
 157         s = fsck_err_get(c, fmt);
 158         if (s) {
 159                 /*
 160                  * We may be called multiple times for the same error on
 161                  * transaction restart - this memoizes instead of asking the user
 162                  * multiple times for the same error:
 163                  */
 164                 if (s->last_msg && !strcmp(buf.buf, s->last_msg)) {
 165                         ret = s->ret;
 166                         mutex_unlock(&c->fsck_error_lock);
 167                         printbuf_exit(&buf);
 168                         return ret;
 169                 }
 170
 171                 kfree(s->last_msg);
 172                 s->last_msg = kstrdup(buf.buf, GFP_KERNEL);
 173
 174                 if (c->opts.ratelimit_errors &&
 175                     !(flags & FSCK_NO_RATELIMIT) &&
 176                     s->nr >= FSCK_ERR_RATELIMIT_NR) {
 177                         if (s->nr == FSCK_ERR_RATELIMIT_NR)
 178                                 suppressing = true;
 179                         else
 180                                 print = false;
 181                 }
 182
 183                 s->nr++;
 184         }
 185
 186 #ifdef BCACHEFS_LOG_PREFIX
 187         if (!strncmp(fmt, "bcachefs:", 9))
 188                 prt_printf(out, bch2_log_msg(c, ""));
 189 #endif
 190
 191         if (test_bit(BCH_FS_FSCK_DONE, &c->flags)) {
 192                 if (c->opts.errors != BCH_ON_ERROR_continue ||
 193                     !(flags & (FSCK_CAN_FIX|FSCK_CAN_IGNORE))) {
 194                         prt_str(out, ", shutting down");
 195                         inconsistent = true;
 196                         ret = -BCH_ERR_fsck_errors_not_fixed;
 197                 } else if (flags & FSCK_CAN_FIX) {
 198                         prt_str(out, ", fixing");
 199                         ret = -BCH_ERR_fsck_fix;
 200                 } else {
 201                         prt_str(out, ", continuing");
 202                         ret = -BCH_ERR_fsck_ignore;
 203                 }
 204         } else if (c->opts.fix_errors == FSCK_FIX_exit) {
 205                 prt_str(out, ", exiting");
 206                 ret = -BCH_ERR_fsck_errors_not_fixed;
 207         } else if (flags & FSCK_CAN_FIX) {
 208                 int fix = s && s->fix
 209                         ? s->fix
 210                         : c->opts.fix_errors;
 211
 212                 if (fix == FSCK_FIX_ask) {
 213                         int ask;
 214
 215                         prt_str(out, ": fix?");
 216                         bch2_print_string_as_lines(KERN_ERR, out->buf);
 217                         print = false;
 218
 219                         ask = bch2_fsck_ask_yn();
 220
 221                         if (ask >= YN_ALLNO && s)
 222                                 s->fix = ask == YN_ALLNO
 223                                         ? FSCK_FIX_no
 224                                         : FSCK_FIX_yes;
 225
 226                         ret = ask & 1
 227                                 ? -BCH_ERR_fsck_fix
 228                                 : -BCH_ERR_fsck_ignore;
 229                 } else if (fix == FSCK_FIX_yes ||
 230                            (c->opts.nochanges &&
 231                             !(flags & FSCK_CAN_IGNORE))) {
 232                         prt_str(out, ", fixing");
 233                         ret = -BCH_ERR_fsck_fix;
 234                 } else {
 235                         prt_str(out, ", not fixing");
 236                 }
 237         } else if (flags & FSCK_NEED_FSCK) {
 238                 prt_str(out, " (run fsck to correct)");
 239         } else {
 240                 prt_str(out, " (repair unimplemented)");
 241         }
 242
 243         if (ret == -BCH_ERR_fsck_ignore &&
 244             (c->opts.fix_errors == FSCK_FIX_exit ||
 245              !(flags & FSCK_CAN_IGNORE)))
 246                 ret = -BCH_ERR_fsck_errors_not_fixed;
 247
 248         if (print)
 249                 bch2_print_string_as_lines(KERN_ERR, out->buf);
 250
 251         if (!test_bit(BCH_FS_FSCK_DONE, &c->flags) &&
 252             (ret != -BCH_ERR_fsck_fix &&
 253              ret != -BCH_ERR_fsck_ignore))
 254                 bch_err(c, "Unable to continue, halting");
 255         else if (suppressing)
 256                 bch_err(c, "Ratelimiting new instances of previous error");
 257
 258         if (s)
 259                 s->ret = ret;
 260
 261         mutex_unlock(&c->fsck_error_lock);
 262
 263         printbuf_exit(&buf);
 264
 265         if (inconsistent)
 266                 bch2_inconsistent_error(c);
 267
 268         if (ret == -BCH_ERR_fsck_fix) {
 269                 set_bit(BCH_FS_ERRORS_FIXED, &c->flags);
 270         } else {
 271                 set_bit(BCH_FS_ERRORS_NOT_FIXED, &c->flags);
 272                 set_bit(BCH_FS_ERROR, &c->flags);
 273         }
 274
 275         return ret;
 276 }
 277
 278 void bch2_flush_fsck_errs(struct bch_fs *c)
 279 {
 280         struct fsck_err_state *s, *n;
 281
 282         mutex_lock(&c->fsck_error_lock);
 283
 284         list_for_each_entry_safe(s, n, &c->fsck_errors, list) {
 285                 if (s->ratelimited && s->last_msg)
 286                         bch_err(c, "Saw %llu errors like:\n    %s", s->nr, s->last_msg);
 287
 288                 list_del(&s->list);
 289                 kfree(s->last_msg);
 290                 kfree(s);
 291         }
 292
 293         mutex_unlock(&c->fsck_error_lock);
 294 }