linux/fs/xfs/xfs_message.c
Brian Foster ccdab3d6e8 xfs: define bug_on_assert debug mode sysfs tunable
In DEBUG mode, assert failures unconditionally trigger a kernel BUG.
This is useful in diagnostic situations to panic a system and
collect detailed state information at the time of a failure.

This can also cause problems in cases where DEBUG mode code is
desired but it is preferable not trigger kernel BUGs on assert
failure. For example, during development of new code or during
certain xfstests tests that intentionally cause corruption and test
the kernel for survival (but otherwise may expect to trigger assert
failures).

To provide additional flexibility, create the
<sysfs>/fs/xfs/debug/bug_on_assert tunable to configure assert
failure behavior at runtime. This tunable is only available in DEBUG
mode and is enabled by default to preserve existing default
behavior. When disabled, assert failures in DEBUG mode result in
kernel warnings.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2017-06-19 08:59:10 -07:00

124 lines
2.9 KiB
C

/*
* Copyright (c) 2011 Red Hat, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_error.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
/*
* XFS logging functions
*/
static void
__xfs_printk(
const char *level,
const struct xfs_mount *mp,
struct va_format *vaf)
{
if (mp && mp->m_fsname) {
printk("%sXFS (%s): %pV\n", level, mp->m_fsname, vaf);
return;
}
printk("%sXFS: %pV\n", level, vaf);
}
#define define_xfs_printk_level(func, kern_level) \
void func(const struct xfs_mount *mp, const char *fmt, ...) \
{ \
struct va_format vaf; \
va_list args; \
int level; \
\
va_start(args, fmt); \
\
vaf.fmt = fmt; \
vaf.va = &args; \
\
__xfs_printk(kern_level, mp, &vaf); \
va_end(args); \
\
if (!kstrtoint(kern_level, 0, &level) && \
level <= LOGLEVEL_ERR && \
xfs_error_level >= XFS_ERRLEVEL_HIGH) \
xfs_stack_trace(); \
} \
define_xfs_printk_level(xfs_emerg, KERN_EMERG);
define_xfs_printk_level(xfs_alert, KERN_ALERT);
define_xfs_printk_level(xfs_crit, KERN_CRIT);
define_xfs_printk_level(xfs_err, KERN_ERR);
define_xfs_printk_level(xfs_warn, KERN_WARNING);
define_xfs_printk_level(xfs_notice, KERN_NOTICE);
define_xfs_printk_level(xfs_info, KERN_INFO);
#ifdef DEBUG
define_xfs_printk_level(xfs_debug, KERN_DEBUG);
#endif
void
xfs_alert_tag(
const struct xfs_mount *mp,
int panic_tag,
const char *fmt, ...)
{
struct va_format vaf;
va_list args;
int do_panic = 0;
if (xfs_panic_mask && (xfs_panic_mask & panic_tag)) {
xfs_alert(mp, "Transforming an alert into a BUG.");
do_panic = 1;
}
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
__xfs_printk(KERN_ALERT, mp, &vaf);
va_end(args);
BUG_ON(do_panic);
}
void
asswarn(char *expr, char *file, int line)
{
xfs_warn(NULL, "Assertion failed: %s, file: %s, line: %d",
expr, file, line);
WARN_ON(1);
}
void
assfail(char *expr, char *file, int line)
{
xfs_emerg(NULL, "Assertion failed: %s, file: %s, line: %d",
expr, file, line);
if (xfs_globals.bug_on_assert)
BUG();
else
WARN_ON(1);
}
void
xfs_hex_dump(void *p, int length)
{
print_hex_dump(KERN_ALERT, "", DUMP_PREFIX_ADDRESS, 16, 1, p, length, 1);
}