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7561d27e90
linux/fs/xfs/xfs_error.h
Brian Foster 7561d27e90 xfs: buffer lru reference count error injection tag 
XFS uses a fixed reference count for certain types of buffers in the
internal LRU cache. These reference counts dictate how aggressively
certain buffers are reclaimed vs. others. While the reference counts
implements priority across different buffer types, all buffers
(other than uncached buffers) are typically cached for at least one
reclaim cycle.

We've had at least one bug recently that has been hidden by a
released buffer sitting around in the LRU. Users hitting the problem
were able to reproduce under enough memory pressure to cause
aggressive reclaim in a particular window of time.

To support future xfstests cases, add an error injection tag to
hardcode the buffer reference count to zero. When enabled, this
bypasses caching of associated buffers and facilitates test cases
that depend on this behavior.

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>
2017-10-26 15:38:23 -07:00

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/*
* Copyright (c) 2000-2002,2005 Silicon Graphics, 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
*/
#ifndef __XFS_ERROR_H__
#define __XFS_ERROR_H__
struct xfs_mount;
extern void xfs_error_report(const char *tag, int level, struct xfs_mount *mp,
const char *filename, int linenum, void *ra);
extern void xfs_corruption_error(const char *tag, int level,
struct xfs_mount *mp, void *p, const char *filename,
int linenum, void *ra);
extern void xfs_verifier_error(struct xfs_buf *bp);
#define XFS_ERROR_REPORT(e, lvl, mp) \
xfs_error_report(e, lvl, mp, __FILE__, __LINE__, __return_address)
#define XFS_CORRUPTION_ERROR(e, lvl, mp, mem) \
xfs_corruption_error(e, lvl, mp, mem, \
__FILE__, __LINE__, __return_address)
#define XFS_ERRLEVEL_OFF 0
#define XFS_ERRLEVEL_LOW 1
#define XFS_ERRLEVEL_HIGH 5
/*
* Macros to set EFSCORRUPTED & return/branch.
*/
#define XFS_WANT_CORRUPTED_GOTO(mp, x, l) \
{ \
int fs_is_ok = (x); \
ASSERT(fs_is_ok); \
if (unlikely(!fs_is_ok)) { \
XFS_ERROR_REPORT("XFS_WANT_CORRUPTED_GOTO", \
XFS_ERRLEVEL_LOW, mp); \
error = -EFSCORRUPTED; \
goto l; \
} \
}
#define XFS_WANT_CORRUPTED_RETURN(mp, x) \
{ \
int fs_is_ok = (x); \
ASSERT(fs_is_ok); \
if (unlikely(!fs_is_ok)) { \
XFS_ERROR_REPORT("XFS_WANT_CORRUPTED_RETURN", \
XFS_ERRLEVEL_LOW, mp); \
return -EFSCORRUPTED; \
} \
}
/*
* error injection tags - the labels can be anything you want
* but each tag should have its own unique number
*/
#define XFS_ERRTAG_NOERROR 0
#define XFS_ERRTAG_IFLUSH_1 1
#define XFS_ERRTAG_IFLUSH_2 2
#define XFS_ERRTAG_IFLUSH_3 3
#define XFS_ERRTAG_IFLUSH_4 4
#define XFS_ERRTAG_IFLUSH_5 5
#define XFS_ERRTAG_IFLUSH_6 6
#define XFS_ERRTAG_DA_READ_BUF 7
#define XFS_ERRTAG_BTREE_CHECK_LBLOCK 8
#define XFS_ERRTAG_BTREE_CHECK_SBLOCK 9
#define XFS_ERRTAG_ALLOC_READ_AGF 10
#define XFS_ERRTAG_IALLOC_READ_AGI 11
#define XFS_ERRTAG_ITOBP_INOTOBP 12
#define XFS_ERRTAG_IUNLINK 13
#define XFS_ERRTAG_IUNLINK_REMOVE 14
#define XFS_ERRTAG_DIR_INO_VALIDATE 15
#define XFS_ERRTAG_BULKSTAT_READ_CHUNK 16
#define XFS_ERRTAG_IODONE_IOERR 17
#define XFS_ERRTAG_STRATREAD_IOERR 18
#define XFS_ERRTAG_STRATCMPL_IOERR 19
#define XFS_ERRTAG_DIOWRITE_IOERR 20
#define XFS_ERRTAG_BMAPIFORMAT 21
#define XFS_ERRTAG_FREE_EXTENT 22
#define XFS_ERRTAG_RMAP_FINISH_ONE 23
#define XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE 24
#define XFS_ERRTAG_REFCOUNT_FINISH_ONE 25
#define XFS_ERRTAG_BMAP_FINISH_ONE 26
#define XFS_ERRTAG_AG_RESV_CRITICAL 27
/*
* DEBUG mode instrumentation to test and/or trigger delayed allocation
* block killing in the event of failed writes. When enabled, all
* buffered writes are silenty dropped and handled as if they failed.
* All delalloc blocks in the range of the write (including pre-existing
* delalloc blocks!) are tossed as part of the write failure error
* handling sequence.
*/
#define XFS_ERRTAG_DROP_WRITES 28
#define XFS_ERRTAG_LOG_BAD_CRC 29
#define XFS_ERRTAG_LOG_ITEM_PIN 30
#define XFS_ERRTAG_BUF_LRU_REF 31
#define XFS_ERRTAG_MAX 32
/*
* Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
*/
#define XFS_RANDOM_DEFAULT 100
#define XFS_RANDOM_IFLUSH_1 XFS_RANDOM_DEFAULT
#define XFS_RANDOM_IFLUSH_2 XFS_RANDOM_DEFAULT
#define XFS_RANDOM_IFLUSH_3 XFS_RANDOM_DEFAULT
#define XFS_RANDOM_IFLUSH_4 XFS_RANDOM_DEFAULT
#define XFS_RANDOM_IFLUSH_5 XFS_RANDOM_DEFAULT
#define XFS_RANDOM_IFLUSH_6 XFS_RANDOM_DEFAULT
#define XFS_RANDOM_DA_READ_BUF XFS_RANDOM_DEFAULT
#define XFS_RANDOM_BTREE_CHECK_LBLOCK (XFS_RANDOM_DEFAULT/4)
#define XFS_RANDOM_BTREE_CHECK_SBLOCK XFS_RANDOM_DEFAULT
#define XFS_RANDOM_ALLOC_READ_AGF XFS_RANDOM_DEFAULT
#define XFS_RANDOM_IALLOC_READ_AGI XFS_RANDOM_DEFAULT
#define XFS_RANDOM_ITOBP_INOTOBP XFS_RANDOM_DEFAULT
#define XFS_RANDOM_IUNLINK XFS_RANDOM_DEFAULT
#define XFS_RANDOM_IUNLINK_REMOVE XFS_RANDOM_DEFAULT
#define XFS_RANDOM_DIR_INO_VALIDATE XFS_RANDOM_DEFAULT
#define XFS_RANDOM_BULKSTAT_READ_CHUNK XFS_RANDOM_DEFAULT
#define XFS_RANDOM_IODONE_IOERR (XFS_RANDOM_DEFAULT/10)
#define XFS_RANDOM_STRATREAD_IOERR (XFS_RANDOM_DEFAULT/10)
#define XFS_RANDOM_STRATCMPL_IOERR (XFS_RANDOM_DEFAULT/10)
#define XFS_RANDOM_DIOWRITE_IOERR (XFS_RANDOM_DEFAULT/10)
#define XFS_RANDOM_BMAPIFORMAT XFS_RANDOM_DEFAULT
#define XFS_RANDOM_FREE_EXTENT 1
#define XFS_RANDOM_RMAP_FINISH_ONE 1
#define XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE 1
#define XFS_RANDOM_REFCOUNT_FINISH_ONE 1
#define XFS_RANDOM_BMAP_FINISH_ONE 1
#define XFS_RANDOM_AG_RESV_CRITICAL 4
#define XFS_RANDOM_DROP_WRITES 1
#define XFS_RANDOM_LOG_BAD_CRC 1
#define XFS_RANDOM_LOG_ITEM_PIN 1
#define XFS_RANDOM_BUF_LRU_REF 2
#ifdef DEBUG
extern int xfs_errortag_init(struct xfs_mount *mp);
extern void xfs_errortag_del(struct xfs_mount *mp);
extern bool xfs_errortag_test(struct xfs_mount *mp, const char *expression,
const char *file, int line, unsigned int error_tag);
#define XFS_TEST_ERROR(expr, mp, tag) \
((expr) || xfs_errortag_test((mp), #expr, __FILE__, __LINE__, (tag)))
extern int xfs_errortag_get(struct xfs_mount *mp, unsigned int error_tag);
extern int xfs_errortag_set(struct xfs_mount *mp, unsigned int error_tag,
unsigned int tag_value);
extern int xfs_errortag_add(struct xfs_mount *mp, unsigned int error_tag);
extern int xfs_errortag_clearall(struct xfs_mount *mp);
#else
#define xfs_errortag_init(mp) (0)
#define xfs_errortag_del(mp)
#define XFS_TEST_ERROR(expr, mp, tag) (expr)
#define xfs_errortag_set(mp, tag, val) (ENOSYS)
#define xfs_errortag_add(mp, tag) (ENOSYS)
#define xfs_errortag_clearall(mp) (ENOSYS)
#endif /* DEBUG */
/*
* XFS panic tags -- allow a call to xfs_alert_tag() be turned into
* a panic by setting xfs_panic_mask in a sysctl.
*/
#define XFS_NO_PTAG 0
#define XFS_PTAG_IFLUSH 0x00000001
#define XFS_PTAG_LOGRES 0x00000002
#define XFS_PTAG_AILDELETE 0x00000004
#define XFS_PTAG_ERROR_REPORT 0x00000008
#define XFS_PTAG_SHUTDOWN_CORRUPT 0x00000010
#define XFS_PTAG_SHUTDOWN_IOERROR 0x00000020
#define XFS_PTAG_SHUTDOWN_LOGERROR 0x00000040
#define XFS_PTAG_FSBLOCK_ZERO 0x00000080
#endif /* __XFS_ERROR_H__ */
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