linux/fs/btrfs/messages.c

// 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 …
#define STATE_STRING_BUF_LEN …

/*
 * Characters to print to indicate error conditions or uncommon filesystem state.
 * RO is not an error.
 */
static const char fs_state_chars[] = …;

static void btrfs_state_to_string(const struct btrfs_fs_info *info, char *buf)
{ … }
#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)
{ … }

/*
 * 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, ...)
{ … }

#ifdef CONFIG_PRINTK
static const char * const logtypes[] = …;

/*
 * 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[] = …;

void __cold _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
{ … }
#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, ...)
{ … }