1 // SPDX-License-Identifier: GPL-2.0 2 3 #include "fs.h" 4 #include "messages.h" 5 #include "discard.h" 6 #include "transaction.h" 7 #include "space-info.h" 8 #include "super.h" 9 10 #ifdef CONFIG_PRINTK 11 12 #define STATE_STRING_PREFACE ": state " 13 #define STATE_STRING_BUF_LEN (sizeof(STATE_STRING_PREFACE) + BTRFS_FS_STATE_COUNT) 14 15 /* 16 * Characters to print to indicate error conditions or uncommon filesystem state. 17 * RO is not an error. 18 */ 19 static const char fs_state_chars[] = { 20 [BTRFS_FS_STATE_ERROR] = 'E', 21 [BTRFS_FS_STATE_REMOUNTING] = 'M', 22 [BTRFS_FS_STATE_RO] = 0, 23 [BTRFS_FS_STATE_TRANS_ABORTED] = 'A', 24 [BTRFS_FS_STATE_DEV_REPLACING] = 'R', 25 [BTRFS_FS_STATE_DUMMY_FS_INFO] = 0, 26 [BTRFS_FS_STATE_NO_CSUMS] = 'C', 27 [BTRFS_FS_STATE_LOG_CLEANUP_ERROR] = 'L', 28 }; 29 30 static void btrfs_state_to_string(const struct btrfs_fs_info *info, char *buf) 31 { 32 unsigned int bit; 33 bool states_printed = false; 34 unsigned long fs_state = READ_ONCE(info->fs_state); 35 char *curr = buf; 36 37 memcpy(curr, STATE_STRING_PREFACE, sizeof(STATE_STRING_PREFACE)); 38 curr += sizeof(STATE_STRING_PREFACE) - 1; 39 40 for_each_set_bit(bit, &fs_state, sizeof(fs_state)) { 41 WARN_ON_ONCE(bit >= BTRFS_FS_STATE_COUNT); 42 if ((bit < BTRFS_FS_STATE_COUNT) && fs_state_chars[bit]) { 43 *curr++ = fs_state_chars[bit]; 44 states_printed = true; 45 } 46 } 47 48 /* If no states were printed, reset the buffer */ 49 if (!states_printed) 50 curr = buf; 51 52 *curr++ = 0; 53 } 54 #endif 55 56 /* 57 * Generally the error codes correspond to their respective errors, but there 58 * are a few special cases. 59 * 60 * EUCLEAN: Any sort of corruption that we encounter. The tree-checker for 61 * instance will return EUCLEAN if any of the blocks are corrupted in 62 * a way that is problematic. We want to reserve EUCLEAN for these 63 * sort of corruptions. 64 * 65 * EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we 66 * need to use EROFS for this case. We will have no idea of the 67 * original failure, that will have been reported at the time we tripped 68 * over the error. Each subsequent error that doesn't have any context 69 * of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR. 70 */ 71 const char * __attribute_const__ btrfs_decode_error(int errno) 72 { 73 char *errstr = "unknown"; 74 75 switch (errno) { 76 case -ENOENT: /* -2 */ 77 errstr = "No such entry"; 78 break; 79 case -EIO: /* -5 */ 80 errstr = "IO failure"; 81 break; 82 case -ENOMEM: /* -12*/ 83 errstr = "Out of memory"; 84 break; 85 case -EEXIST: /* -17 */ 86 errstr = "Object already exists"; 87 break; 88 case -ENOSPC: /* -28 */ 89 errstr = "No space left"; 90 break; 91 case -EROFS: /* -30 */ 92 errstr = "Readonly filesystem"; 93 break; 94 case -EOPNOTSUPP: /* -95 */ 95 errstr = "Operation not supported"; 96 break; 97 case -EUCLEAN: /* -117 */ 98 errstr = "Filesystem corrupted"; 99 break; 100 case -EDQUOT: /* -122 */ 101 errstr = "Quota exceeded"; 102 break; 103 } 104 105 return errstr; 106 } 107 108 /* 109 * __btrfs_handle_fs_error decodes expected errors from the caller and 110 * invokes the appropriate error response. 111 */ 112 __cold 113 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, 114 unsigned int line, int errno, const char *fmt, ...) 115 { 116 struct super_block *sb = fs_info->sb; 117 #ifdef CONFIG_PRINTK 118 char statestr[STATE_STRING_BUF_LEN]; 119 const char *errstr; 120 #endif 121 122 #ifdef CONFIG_PRINTK_INDEX 123 printk_index_subsys_emit( 124 "BTRFS: error (device %s%s) in %s:%d: errno=%d %s", KERN_CRIT, fmt); 125 #endif 126 127 /* 128 * Special case: if the error is EROFS, and we're already under 129 * SB_RDONLY, then it is safe here. 130 */ 131 if (errno == -EROFS && sb_rdonly(sb)) 132 return; 133 134 #ifdef CONFIG_PRINTK 135 errstr = btrfs_decode_error(errno); 136 btrfs_state_to_string(fs_info, statestr); 137 if (fmt) { 138 struct va_format vaf; 139 va_list args; 140 141 va_start(args, fmt); 142 vaf.fmt = fmt; 143 vaf.va = &args; 144 145 pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s (%pV)\n", 146 sb->s_id, statestr, function, line, errno, errstr, &vaf); 147 va_end(args); 148 } else { 149 pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s\n", 150 sb->s_id, statestr, function, line, errno, errstr); 151 } 152 #endif 153 154 /* 155 * Today we only save the error info to memory. Long term we'll also 156 * send it down to the disk. 157 */ 158 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); 159 160 /* Don't go through full error handling during mount. */ 161 if (!(sb->s_flags & SB_BORN)) 162 return; 163 164 if (sb_rdonly(sb)) 165 return; 166 167 btrfs_discard_stop(fs_info); 168 169 /* Handle error by forcing the filesystem readonly. */ 170 btrfs_set_sb_rdonly(sb); 171 btrfs_info(fs_info, "forced readonly"); 172 /* 173 * Note that a running device replace operation is not canceled here 174 * although there is no way to update the progress. It would add the 175 * risk of a deadlock, therefore the canceling is omitted. The only 176 * penalty is that some I/O remains active until the procedure 177 * completes. The next time when the filesystem is mounted writable 178 * again, the device replace operation continues. 179 */ 180 } 181 182 #ifdef CONFIG_PRINTK 183 static const char * const logtypes[] = { 184 "emergency", 185 "alert", 186 "critical", 187 "error", 188 "warning", 189 "notice", 190 "info", 191 "debug", 192 }; 193 194 /* 195 * Use one ratelimit state per log level so that a flood of less important 196 * messages doesn't cause more important ones to be dropped. 197 */ 198 static struct ratelimit_state printk_limits[] = { 199 RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100), 200 RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100), 201 RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100), 202 RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100), 203 RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100), 204 RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100), 205 RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100), 206 RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100), 207 }; 208 209 void __cold _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 210 { 211 char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0"; 212 struct va_format vaf; 213 va_list args; 214 int kern_level; 215 const char *type = logtypes[4]; 216 struct ratelimit_state *ratelimit = &printk_limits[4]; 217 218 #ifdef CONFIG_PRINTK_INDEX 219 printk_index_subsys_emit("%sBTRFS %s (device %s): ", NULL, fmt); 220 #endif 221 222 va_start(args, fmt); 223 224 while ((kern_level = printk_get_level(fmt)) != 0) { 225 size_t size = printk_skip_level(fmt) - fmt; 226 227 if (kern_level >= '0' && kern_level <= '7') { 228 memcpy(lvl, fmt, size); 229 lvl[size] = '\0'; 230 type = logtypes[kern_level - '0']; 231 ratelimit = &printk_limits[kern_level - '0']; 232 } 233 fmt += size; 234 } 235 236 vaf.fmt = fmt; 237 vaf.va = &args; 238 239 if (__ratelimit(ratelimit)) { 240 if (fs_info) { 241 char statestr[STATE_STRING_BUF_LEN]; 242 243 btrfs_state_to_string(fs_info, statestr); 244 _printk("%sBTRFS %s (device %s%s): %pV\n", lvl, type, 245 fs_info->sb->s_id, statestr, &vaf); 246 } else { 247 _printk("%sBTRFS %s: %pV\n", lvl, type, &vaf); 248 } 249 } 250 251 va_end(args); 252 } 253 #endif 254 255 void __cold btrfs_print_v0_err(struct btrfs_fs_info *fs_info) 256 { 257 btrfs_err(fs_info, 258 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel"); 259 } 260 261 #if BITS_PER_LONG == 32 262 void __cold btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info) 263 { 264 if (!test_and_set_bit(BTRFS_FS_32BIT_WARN, &fs_info->flags)) { 265 btrfs_warn(fs_info, "reaching 32bit limit for logical addresses"); 266 btrfs_warn(fs_info, 267 "due to page cache limit on 32bit systems, btrfs can't access metadata at or beyond %lluT", 268 BTRFS_32BIT_MAX_FILE_SIZE >> 40); 269 btrfs_warn(fs_info, 270 "please consider upgrading to 64bit kernel/hardware"); 271 } 272 } 273 274 void __cold btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info) 275 { 276 if (!test_and_set_bit(BTRFS_FS_32BIT_ERROR, &fs_info->flags)) { 277 btrfs_err(fs_info, "reached 32bit limit for logical addresses"); 278 btrfs_err(fs_info, 279 "due to page cache limit on 32bit systems, metadata beyond %lluT can't be accessed", 280 BTRFS_32BIT_MAX_FILE_SIZE >> 40); 281 btrfs_err(fs_info, 282 "please consider upgrading to 64bit kernel/hardware"); 283 } 284 } 285 #endif 286 287 /* 288 * __btrfs_panic decodes unexpected, fatal errors from the caller, issues an 289 * alert, and either panics or BUGs, depending on mount options. 290 */ 291 __cold 292 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 293 unsigned int line, int errno, const char *fmt, ...) 294 { 295 char *s_id = "<unknown>"; 296 const char *errstr; 297 struct va_format vaf = { .fmt = fmt }; 298 va_list args; 299 300 if (fs_info) 301 s_id = fs_info->sb->s_id; 302 303 va_start(args, fmt); 304 vaf.va = &args; 305 306 errstr = btrfs_decode_error(errno); 307 if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR))) 308 panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", 309 s_id, function, line, &vaf, errno, errstr); 310 311 btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", 312 function, line, &vaf, errno, errstr); 313 va_end(args); 314 /* Caller calls BUG() */ 315 } 316