fs/btrfs/messages.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0

 #include "fs.h"
 #include "messages.h"
 #include "discard.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 error)
 {
 	char *errstr = "unknown";

 	switch (error) {
 	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;
 }

 /*
  * 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 error, 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 (error == -EROFS && sb_rdonly(sb))
 		return;

 #ifdef CONFIG_PRINTK
 	errstr = btrfs_decode_error(error);
 	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, error, 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, error, 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, error);

 	/* 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

 /*
  * Decode unexpected, fatal errors from the caller, issue an alert, and either
  * panic or BUGs, depending on mount options.
  */
 __cold
 void __btrfs_panic(const struct btrfs_fs_info *fs_info, const char *function,
 		   unsigned int line, int error, 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(error);
 	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, error, errstr);

 	btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)",
 		   function, line, &vaf, error, errstr);
 	va_end(args);
 	/* Caller calls BUG() */
 }
	// SPDX-License-Identifier: GPL-2.0

	#include "fs.h"
	#include "messages.h"
	#include "discard.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 error)
	{
	char *errstr = "unknown";

	switch (error) {
	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;
	}

	/*
	* 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 error, 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 (error == -EROFS && sb_rdonly(sb))
	return;

	#ifdef CONFIG_PRINTK
	errstr = btrfs_decode_error(error);
	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, error, 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, error, 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, error);

	/* 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

	/*
	* Decode unexpected, fatal errors from the caller, issue an alert, and either
	* panic or BUGs, depending on mount options.
	*/
	__cold
	void __btrfs_panic(const struct btrfs_fs_info fs_info, const char function,
	unsigned int line, int error, 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(error);
	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, error, errstr);

	btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)",
	function, line, &vaf, error, errstr);
	va_end(args);
	/* Caller calls BUG() */
	}