Rename from bcache-tools to bcachefs-tools

1 files changed, 237 insertions, 0 deletions

diff --git a/libbcachefs/error.h b/libbcachefs/error.h
new file mode 100644
index 00000000..83d3a627
--- /dev/null
+++ b/libbcachefs/error.h
@@ -0,0 +1,237 @@
+#ifndef _BCACHE_ERROR_H
+#define _BCACHE_ERROR_H
+
+#include <linux/printk.h>
+
+struct bch_dev;
+struct bch_fs;
+
+/*
+ * XXX: separate out errors that indicate on disk data is inconsistent, and flag
+ * superblock as such
+ */
+
+/* Error messages: */
+
+/*
+ * Very fatal logic/inconsistency errors: these indicate that we've majorly
+ * screwed up at runtime, i.e. it's not likely that it was just caused by the
+ * data on disk being inconsistent. These BUG():
+ *
+ * XXX: audit and convert to inconsistent() checks
+ */
+
+#define bch2_fs_bug(c, ...)						\
+do {									\
+	bch_err(c, __VA_ARGS__);					\
+	BUG();								\
+} while (0)
+
+#define bch2_fs_bug_on(cond, c, ...)					\
+do {									\
+	if (cond)							\
+		bch2_fs_bug(c, __VA_ARGS__);				\
+} while (0)
+
+/*
+ * Inconsistency errors: The on disk data is inconsistent. If these occur during
+ * initial recovery, they don't indicate a bug in the running code - we walk all
+ * the metadata before modifying anything. If they occur at runtime, they
+ * indicate either a bug in the running code or (less likely) data is being
+ * silently corrupted under us.
+ *
+ * XXX: audit all inconsistent errors and make sure they're all recoverable, in
+ * BCH_ON_ERROR_CONTINUE mode
+ */
+
+void bch2_inconsistent_error(struct bch_fs *);
+
+#define bch2_fs_inconsistent(c, ...)					\
+do {									\
+	bch_err(c, __VA_ARGS__);					\
+	bch2_inconsistent_error(c);					\
+} while (0)
+
+#define bch2_fs_inconsistent_on(cond, c, ...)				\
+({									\
+	int _ret = !!(cond);						\
+									\
+	if (_ret)							\
+		bch2_fs_inconsistent(c, __VA_ARGS__);			\
+	_ret;								\
+})
+
+/*
+ * Later we might want to mark only the particular device inconsistent, not the
+ * entire filesystem:
+ */
+
+#define bch2_dev_inconsistent(ca, ...)					\
+do {									\
+	bch_err(ca, __VA_ARGS__);					\
+	bch2_inconsistent_error((ca)->fs);				\
+} while (0)
+
+#define bch2_dev_inconsistent_on(cond, ca, ...)				\
+({									\
+	int _ret = !!(cond);						\
+									\
+	if (_ret)							\
+		bch2_dev_inconsistent(ca, __VA_ARGS__);			\
+	_ret;								\
+})
+
+/*
+ * Fsck errors: inconsistency errors we detect at mount time, and should ideally
+ * be able to repair:
+ */
+
+enum {
+	BCH_FSCK_OK			= 0,
+	BCH_FSCK_ERRORS_NOT_FIXED	= 1,
+	BCH_FSCK_REPAIR_UNIMPLEMENTED	= 2,
+	BCH_FSCK_REPAIR_IMPOSSIBLE	= 3,
+	BCH_FSCK_UNKNOWN_VERSION	= 4,
+};
+
+/* These macros return true if error should be fixed: */
+
+/* XXX: mark in superblock that filesystem contains errors, if we ignore: */
+
+#ifndef __fsck_err
+#define __fsck_err(c, _can_fix, _can_ignore, _nofix_msg, msg, ...)	\
+({									\
+	bool _fix = false;						\
+									\
+	if (_can_fix && (c)->opts.fix_errors) {				\
+		bch_err(c, msg ", fixing", ##__VA_ARGS__);		\
+		set_bit(BCH_FS_FSCK_FIXED_ERRORS, &(c)->flags);	\
+		_fix = true;						\
+	} else if (_can_ignore &&					\
+		   (c)->opts.errors == BCH_ON_ERROR_CONTINUE) {		\
+		bch_err(c, msg " (ignoring)", ##__VA_ARGS__);		\
+	} else {							\
+		bch_err(c, msg " ("_nofix_msg")", ##__VA_ARGS__);	\
+		ret = BCH_FSCK_ERRORS_NOT_FIXED;			\
+		goto fsck_err;						\
+	}								\
+									\
+	BUG_ON(!_fix && !_can_ignore);					\
+	_fix;								\
+})
+#endif
+
+#define __fsck_err_on(cond, c, _can_fix, _can_ignore, _nofix_msg, ...)	\
+	((cond) ? __fsck_err(c, _can_fix, _can_ignore,			\
+			     _nofix_msg, ##__VA_ARGS__) : false)
+
+#define unfixable_fsck_err_on(cond, c, ...)				\
+	__fsck_err_on(cond, c, false, true, "repair unimplemented", ##__VA_ARGS__)
+
+#define need_fsck_err_on(cond, c, ...)					\
+	__fsck_err_on(cond, c, false, true, "run fsck to correct", ##__VA_ARGS__)
+
+#define mustfix_fsck_err(c, ...)					\
+	__fsck_err(c, true, false, "not fixing", ##__VA_ARGS__)
+
+#define mustfix_fsck_err_on(cond, c, ...)				\
+	__fsck_err_on(cond, c, true, false, "not fixing", ##__VA_ARGS__)
+
+#define fsck_err_on(cond, c, ...)					\
+	__fsck_err_on(cond, c, true, true, "not fixing", ##__VA_ARGS__)
+
+/*
+ * Fatal errors: these don't indicate a bug, but we can't continue running in RW
+ * mode - pretty much just due to metadata IO errors:
+ */
+
+void bch2_fatal_error(struct bch_fs *);
+
+#define bch2_fs_fatal_error(c, ...)					\
+do {									\
+	bch_err(c, __VA_ARGS__);					\
+	bch2_fatal_error(c);						\
+} while (0)
+
+#define bch2_fs_fatal_err_on(cond, c, ...)				\
+({									\
+	int _ret = !!(cond);						\
+									\
+	if (_ret)							\
+		bch2_fs_fatal_error(c, __VA_ARGS__);			\
+	_ret;								\
+})
+
+#define bch2_dev_fatal_error(ca, ...)					\
+do {									\
+	bch_err(ca, __VA_ARGS__);					\
+	bch2_fatal_error(c);						\
+} while (0)
+
+#define bch2_dev_fatal_io_error(ca, fmt, ...)				\
+do {									\
+	printk_ratelimited(KERN_ERR bch2_fmt((ca)->fs,			\
+		"fatal IO error on %s for " fmt),			\
+		(ca)->name, ##__VA_ARGS__);				\
+	bch2_fatal_error((ca)->fs);					\
+} while (0)
+
+#define bch2_dev_fatal_io_err_on(cond, ca, ...)				\
+({									\
+	int _ret = !!(cond);						\
+									\
+	if (_ret)							\
+		bch2_dev_fatal_io_error(ca, __VA_ARGS__);		\
+	_ret;								\
+})
+
+/*
+ * Nonfatal IO errors: either recoverable metadata IO (because we have
+ * replicas), or data IO - we need to log it and print out a message, but we
+ * don't (necessarily) want to shut down the fs:
+ */
+
+void bch2_nonfatal_io_error_work(struct work_struct *);
+
+/* Does the error handling without logging a message */
+void bch2_nonfatal_io_error(struct bch_dev *);
+
+#if 0
+#define bch2_fs_nonfatal_io_error(c, ...)				\
+do {									\
+	bch_err(c, __VA_ARGS__);					\
+	bch2_nonfatal_io_error(c);					\
+} while (0)
+#endif
+
+/* Logs message and handles the error: */
+#define bch2_dev_nonfatal_io_error(ca, fmt, ...)				\
+do {									\
+	printk_ratelimited(KERN_ERR bch2_fmt((ca)->fs,			\
+		"IO error on %s for " fmt),				\
+		(ca)->name, ##__VA_ARGS__);				\
+	bch2_nonfatal_io_error(ca);					\
+} while (0)
+
+#define bch2_dev_nonfatal_io_err_on(cond, ca, ...)			\
+({									\
+	bool _ret = (cond);						\
+									\
+	if (_ret)							\
+		bch2_dev_nonfatal_io_error(ca, __VA_ARGS__);		\
+	_ret;								\
+})
+
+/* kill? */
+
+#define __bcache_io_error(c, fmt, ...)					\
+	printk_ratelimited(KERN_ERR bch2_fmt(c,				\
+			"IO error: " fmt), ##__VA_ARGS__)
+
+#define bcache_io_error(c, bio, fmt, ...)				\
+do {									\
+	__bcache_io_error(c, fmt, ##__VA_ARGS__);			\
+	(bio)->bi_error = -EIO;						\
+} while (0)
+
+#endif /* _BCACHE_ERROR_H */