1 // SPDX-License-Identifier: GPL-2.0
10 #define STATE_STRING_PREFACE " state "
11 #define STATE_STRING_BUF_LEN (sizeof(STATE_STRING_PREFACE) + BTRFS_FS_STATE_COUNT + 1)
14 * Characters to print to indicate error conditions or uncommon filesystem state.
17 static const char fs_state_chars[] = {
18 [BTRFS_FS_STATE_REMOUNTING] = 'M',
19 [BTRFS_FS_STATE_RO] = 0,
20 [BTRFS_FS_STATE_TRANS_ABORTED] = 'A',
21 [BTRFS_FS_STATE_DEV_REPLACING] = 'R',
22 [BTRFS_FS_STATE_DUMMY_FS_INFO] = 0,
23 [BTRFS_FS_STATE_NO_CSUMS] = 'C',
24 [BTRFS_FS_STATE_LOG_CLEANUP_ERROR] = 'L',
27 static void btrfs_state_to_string(const struct btrfs_fs_info *info, char *buf)
30 bool states_printed = false;
31 unsigned long fs_state = READ_ONCE(info->fs_state);
34 memcpy(curr, STATE_STRING_PREFACE, sizeof(STATE_STRING_PREFACE));
35 curr += sizeof(STATE_STRING_PREFACE) - 1;
37 if (BTRFS_FS_ERROR(info)) {
39 states_printed = true;
42 for_each_set_bit(bit, &fs_state, sizeof(fs_state)) {
43 WARN_ON_ONCE(bit >= BTRFS_FS_STATE_COUNT);
44 if ((bit < BTRFS_FS_STATE_COUNT) && fs_state_chars[bit]) {
45 *curr++ = fs_state_chars[bit];
46 states_printed = true;
50 /* If no states were printed, reset the buffer */
59 * Generally the error codes correspond to their respective errors, but there
60 * are a few special cases.
62 * EUCLEAN: Any sort of corruption that we encounter. The tree-checker for
63 * instance will return EUCLEAN if any of the blocks are corrupted in
64 * a way that is problematic. We want to reserve EUCLEAN for these
65 * sort of corruptions.
67 * EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we
68 * need to use EROFS for this case. We will have no idea of the
69 * original failure, that will have been reported at the time we tripped
70 * over the error. Each subsequent error that doesn't have any context
71 * of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR.
73 const char * __attribute_const__ btrfs_decode_error(int error)
75 char *errstr = "unknown";
78 case -ENOENT: /* -2 */
79 errstr = "No such entry";
82 errstr = "IO failure";
84 case -ENOMEM: /* -12*/
85 errstr = "Out of memory";
87 case -EEXIST: /* -17 */
88 errstr = "Object already exists";
90 case -ENOSPC: /* -28 */
91 errstr = "No space left";
93 case -EROFS: /* -30 */
94 errstr = "Readonly filesystem";
96 case -EOPNOTSUPP: /* -95 */
97 errstr = "Operation not supported";
99 case -EUCLEAN: /* -117 */
100 errstr = "Filesystem corrupted";
102 case -EDQUOT: /* -122 */
103 errstr = "Quota exceeded";
111 * Decodes expected errors from the caller and invokes the appropriate error
115 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
116 unsigned int line, int error, const char *fmt, ...)
118 struct super_block *sb = fs_info->sb;
120 char statestr[STATE_STRING_BUF_LEN];
124 #ifdef CONFIG_PRINTK_INDEX
125 printk_index_subsys_emit(
126 "BTRFS: error (device %s%s) in %s:%d: errno=%d %s", KERN_CRIT, fmt);
130 * Special case: if the error is EROFS, and we're already under
131 * SB_RDONLY, then it is safe here.
133 if (error == -EROFS && sb_rdonly(sb))
137 errstr = btrfs_decode_error(error);
138 btrfs_state_to_string(fs_info, statestr);
140 struct va_format vaf;
147 pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s (%pV)\n",
148 sb->s_id, statestr, function, line, error, errstr, &vaf);
151 pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s\n",
152 sb->s_id, statestr, function, line, error, errstr);
157 * Today we only save the error info to memory. Long term we'll also
158 * send it down to the disk.
160 WRITE_ONCE(fs_info->fs_error, error);
162 /* Don't go through full error handling during mount. */
163 if (!(sb->s_flags & SB_BORN))
169 btrfs_discard_stop(fs_info);
171 /* Handle error by forcing the filesystem readonly. */
172 btrfs_set_sb_rdonly(sb);
173 btrfs_info(fs_info, "forced readonly");
175 * Note that a running device replace operation is not canceled here
176 * although there is no way to update the progress. It would add the
177 * risk of a deadlock, therefore the canceling is omitted. The only
178 * penalty is that some I/O remains active until the procedure
179 * completes. The next time when the filesystem is mounted writable
180 * again, the device replace operation continues.
185 static const char * const logtypes[] = {
197 * Use one ratelimit state per log level so that a flood of less important
198 * messages doesn't cause more important ones to be dropped.
200 static struct ratelimit_state printk_limits[] = {
201 RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100),
202 RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100),
203 RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100),
204 RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100),
205 RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100),
206 RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100),
207 RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100),
208 RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100),
211 void __cold _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
213 char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0";
214 struct va_format vaf;
217 const char *type = logtypes[4];
218 struct ratelimit_state *ratelimit = &printk_limits[4];
220 #ifdef CONFIG_PRINTK_INDEX
221 printk_index_subsys_emit("%sBTRFS %s (device %s): ", NULL, fmt);
226 while ((kern_level = printk_get_level(fmt)) != 0) {
227 size_t size = printk_skip_level(fmt) - fmt;
229 if (kern_level >= '0' && kern_level <= '7') {
230 memcpy(lvl, fmt, size);
232 type = logtypes[kern_level - '0'];
233 ratelimit = &printk_limits[kern_level - '0'];
241 if (__ratelimit(ratelimit)) {
243 char statestr[STATE_STRING_BUF_LEN];
245 btrfs_state_to_string(fs_info, statestr);
246 _printk("%sBTRFS %s (device %s%s): %pV\n", lvl, type,
247 fs_info->sb->s_id, statestr, &vaf);
249 _printk("%sBTRFS %s: %pV\n", lvl, type, &vaf);
257 #if BITS_PER_LONG == 32
258 void __cold btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info)
260 if (!test_and_set_bit(BTRFS_FS_32BIT_WARN, &fs_info->flags)) {
261 btrfs_warn(fs_info, "reaching 32bit limit for logical addresses");
263 "due to page cache limit on 32bit systems, btrfs can't access metadata at or beyond %lluT",
264 BTRFS_32BIT_MAX_FILE_SIZE >> 40);
266 "please consider upgrading to 64bit kernel/hardware");
270 void __cold btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info)
272 if (!test_and_set_bit(BTRFS_FS_32BIT_ERROR, &fs_info->flags)) {
273 btrfs_err(fs_info, "reached 32bit limit for logical addresses");
275 "due to page cache limit on 32bit systems, metadata beyond %lluT can't be accessed",
276 BTRFS_32BIT_MAX_FILE_SIZE >> 40);
278 "please consider upgrading to 64bit kernel/hardware");
284 * Decode unexpected, fatal errors from the caller, issue an alert, and either
285 * panic or BUGs, depending on mount options.
288 void __btrfs_panic(const struct btrfs_fs_info *fs_info, const char *function,
289 unsigned int line, int error, const char *fmt, ...)
291 char *s_id = "<unknown>";
293 struct va_format vaf = { .fmt = fmt };
297 s_id = fs_info->sb->s_id;
302 errstr = btrfs_decode_error(error);
303 if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR)))
304 panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n",
305 s_id, function, line, &vaf, error, errstr);
307 btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)",
308 function, line, &vaf, error, errstr);
310 /* Caller calls BUG() */