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