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-rw-r--r--fs/btrfs/messages.c313
1 files changed, 313 insertions, 0 deletions
diff --git a/fs/btrfs/messages.c b/fs/btrfs/messages.c
new file mode 100644
index 0000000000..7695decc72
--- /dev/null
+++ b/fs/btrfs/messages.c
@@ -0,0 +1,313 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include "fs.h"
+#include "messages.h"
+#include "discard.h"
+#include "transaction.h"
+#include "space-info.h"
+#include "super.h"
+
+#ifdef CONFIG_PRINTK
+
+#define STATE_STRING_PREFACE ": state "
+#define STATE_STRING_BUF_LEN (sizeof(STATE_STRING_PREFACE) + BTRFS_FS_STATE_COUNT + 1)
+
+/*
+ * Characters to print to indicate error conditions or uncommon filesystem state.
+ * RO is not an error.
+ */
+static const char fs_state_chars[] = {
+ [BTRFS_FS_STATE_REMOUNTING] = 'M',
+ [BTRFS_FS_STATE_RO] = 0,
+ [BTRFS_FS_STATE_TRANS_ABORTED] = 'A',
+ [BTRFS_FS_STATE_DEV_REPLACING] = 'R',
+ [BTRFS_FS_STATE_DUMMY_FS_INFO] = 0,
+ [BTRFS_FS_STATE_NO_CSUMS] = 'C',
+ [BTRFS_FS_STATE_LOG_CLEANUP_ERROR] = 'L',
+};
+
+static void btrfs_state_to_string(const struct btrfs_fs_info *info, char *buf)
+{
+ unsigned int bit;
+ bool states_printed = false;
+ unsigned long fs_state = READ_ONCE(info->fs_state);
+ char *curr = buf;
+
+ memcpy(curr, STATE_STRING_PREFACE, sizeof(STATE_STRING_PREFACE));
+ curr += sizeof(STATE_STRING_PREFACE) - 1;
+
+ if (BTRFS_FS_ERROR(info)) {
+ *curr++ = 'E';
+ states_printed = true;
+ }
+
+ for_each_set_bit(bit, &fs_state, sizeof(fs_state)) {
+ WARN_ON_ONCE(bit >= BTRFS_FS_STATE_COUNT);
+ if ((bit < BTRFS_FS_STATE_COUNT) && fs_state_chars[bit]) {
+ *curr++ = fs_state_chars[bit];
+ states_printed = true;
+ }
+ }
+
+ /* If no states were printed, reset the buffer */
+ if (!states_printed)
+ curr = buf;
+
+ *curr++ = 0;
+}
+#endif
+
+/*
+ * Generally the error codes correspond to their respective errors, but there
+ * are a few special cases.
+ *
+ * EUCLEAN: Any sort of corruption that we encounter. The tree-checker for
+ * instance will return EUCLEAN if any of the blocks are corrupted in
+ * a way that is problematic. We want to reserve EUCLEAN for these
+ * sort of corruptions.
+ *
+ * EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we
+ * need to use EROFS for this case. We will have no idea of the
+ * original failure, that will have been reported at the time we tripped
+ * over the error. Each subsequent error that doesn't have any context
+ * of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR.
+ */
+const char * __attribute_const__ btrfs_decode_error(int errno)
+{
+ char *errstr = "unknown";
+
+ switch (errno) {
+ case -ENOENT: /* -2 */
+ errstr = "No such entry";
+ break;
+ case -EIO: /* -5 */
+ errstr = "IO failure";
+ break;
+ case -ENOMEM: /* -12*/
+ errstr = "Out of memory";
+ break;
+ case -EEXIST: /* -17 */
+ errstr = "Object already exists";
+ break;
+ case -ENOSPC: /* -28 */
+ errstr = "No space left";
+ break;
+ case -EROFS: /* -30 */
+ errstr = "Readonly filesystem";
+ break;
+ case -EOPNOTSUPP: /* -95 */
+ errstr = "Operation not supported";
+ break;
+ case -EUCLEAN: /* -117 */
+ errstr = "Filesystem corrupted";
+ break;
+ case -EDQUOT: /* -122 */
+ errstr = "Quota exceeded";
+ break;
+ }
+
+ return errstr;
+}
+
+/*
+ * __btrfs_handle_fs_error decodes expected errors from the caller and
+ * invokes the appropriate error response.
+ */
+__cold
+void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
+ unsigned int line, int errno, const char *fmt, ...)
+{
+ struct super_block *sb = fs_info->sb;
+#ifdef CONFIG_PRINTK
+ char statestr[STATE_STRING_BUF_LEN];
+ const char *errstr;
+#endif
+
+#ifdef CONFIG_PRINTK_INDEX
+ printk_index_subsys_emit(
+ "BTRFS: error (device %s%s) in %s:%d: errno=%d %s", KERN_CRIT, fmt);
+#endif
+
+ /*
+ * Special case: if the error is EROFS, and we're already under
+ * SB_RDONLY, then it is safe here.
+ */
+ if (errno == -EROFS && sb_rdonly(sb))
+ return;
+
+#ifdef CONFIG_PRINTK
+ errstr = btrfs_decode_error(errno);
+ btrfs_state_to_string(fs_info, statestr);
+ if (fmt) {
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s (%pV)\n",
+ sb->s_id, statestr, function, line, errno, errstr, &vaf);
+ va_end(args);
+ } else {
+ pr_crit("BTRFS: error (device %s%s) in %s:%d: errno=%d %s\n",
+ sb->s_id, statestr, function, line, errno, errstr);
+ }
+#endif
+
+ /*
+ * Today we only save the error info to memory. Long term we'll also
+ * send it down to the disk.
+ */
+ WRITE_ONCE(fs_info->fs_error, errno);
+
+ /* Don't go through full error handling during mount. */
+ if (!(sb->s_flags & SB_BORN))
+ return;
+
+ if (sb_rdonly(sb))
+ return;
+
+ btrfs_discard_stop(fs_info);
+
+ /* Handle error by forcing the filesystem readonly. */
+ btrfs_set_sb_rdonly(sb);
+ btrfs_info(fs_info, "forced readonly");
+ /*
+ * Note that a running device replace operation is not canceled here
+ * although there is no way to update the progress. It would add the
+ * risk of a deadlock, therefore the canceling is omitted. The only
+ * penalty is that some I/O remains active until the procedure
+ * completes. The next time when the filesystem is mounted writable
+ * again, the device replace operation continues.
+ */
+}
+
+#ifdef CONFIG_PRINTK
+static const char * const logtypes[] = {
+ "emergency",
+ "alert",
+ "critical",
+ "error",
+ "warning",
+ "notice",
+ "info",
+ "debug",
+};
+
+/*
+ * Use one ratelimit state per log level so that a flood of less important
+ * messages doesn't cause more important ones to be dropped.
+ */
+static struct ratelimit_state printk_limits[] = {
+ RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100),
+ RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100),
+ RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100),
+ RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100),
+ RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100),
+ RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100),
+ RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100),
+ RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100),
+};
+
+void __cold _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
+{
+ char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0";
+ struct va_format vaf;
+ va_list args;
+ int kern_level;
+ const char *type = logtypes[4];
+ struct ratelimit_state *ratelimit = &printk_limits[4];
+
+#ifdef CONFIG_PRINTK_INDEX
+ printk_index_subsys_emit("%sBTRFS %s (device %s): ", NULL, fmt);
+#endif
+
+ va_start(args, fmt);
+
+ while ((kern_level = printk_get_level(fmt)) != 0) {
+ size_t size = printk_skip_level(fmt) - fmt;
+
+ if (kern_level >= '0' && kern_level <= '7') {
+ memcpy(lvl, fmt, size);
+ lvl[size] = '\0';
+ type = logtypes[kern_level - '0'];
+ ratelimit = &printk_limits[kern_level - '0'];
+ }
+ fmt += size;
+ }
+
+ vaf.fmt = fmt;
+ vaf.va = &args;
+
+ if (__ratelimit(ratelimit)) {
+ if (fs_info) {
+ char statestr[STATE_STRING_BUF_LEN];
+
+ btrfs_state_to_string(fs_info, statestr);
+ _printk("%sBTRFS %s (device %s%s): %pV\n", lvl, type,
+ fs_info->sb->s_id, statestr, &vaf);
+ } else {
+ _printk("%sBTRFS %s: %pV\n", lvl, type, &vaf);
+ }
+ }
+
+ va_end(args);
+}
+#endif
+
+#if BITS_PER_LONG == 32
+void __cold btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info)
+{
+ if (!test_and_set_bit(BTRFS_FS_32BIT_WARN, &fs_info->flags)) {
+ btrfs_warn(fs_info, "reaching 32bit limit for logical addresses");
+ btrfs_warn(fs_info,
+"due to page cache limit on 32bit systems, btrfs can't access metadata at or beyond %lluT",
+ BTRFS_32BIT_MAX_FILE_SIZE >> 40);
+ btrfs_warn(fs_info,
+ "please consider upgrading to 64bit kernel/hardware");
+ }
+}
+
+void __cold btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info)
+{
+ if (!test_and_set_bit(BTRFS_FS_32BIT_ERROR, &fs_info->flags)) {
+ btrfs_err(fs_info, "reached 32bit limit for logical addresses");
+ btrfs_err(fs_info,
+"due to page cache limit on 32bit systems, metadata beyond %lluT can't be accessed",
+ BTRFS_32BIT_MAX_FILE_SIZE >> 40);
+ btrfs_err(fs_info,
+ "please consider upgrading to 64bit kernel/hardware");
+ }
+}
+#endif
+
+/*
+ * __btrfs_panic decodes unexpected, fatal errors from the caller, issues an
+ * alert, and either panics or BUGs, depending on mount options.
+ */
+__cold
+void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
+ unsigned int line, int errno, const char *fmt, ...)
+{
+ char *s_id = "<unknown>";
+ const char *errstr;
+ struct va_format vaf = { .fmt = fmt };
+ va_list args;
+
+ if (fs_info)
+ s_id = fs_info->sb->s_id;
+
+ va_start(args, fmt);
+ vaf.va = &args;
+
+ errstr = btrfs_decode_error(errno);
+ if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR)))
+ panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n",
+ s_id, function, line, &vaf, errno, errstr);
+
+ btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)",
+ function, line, &vaf, errno, errstr);
+ va_end(args);
+ /* Caller calls BUG() */
+}