[mirror_ubuntu-artful-kernel.git] / fs / xfs / xfs_error.c

/*
 * Copyright (c) 2000-2001,2005 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
 */
#include "xfs.h"
#include "xfs_format.h"
#include "xfs_fs.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_error.h"
#include "xfs_sysfs.h"

#ifdef DEBUG

static unsigned int xfs_errortag_random_default[] = {
	XFS_RANDOM_DEFAULT,
	XFS_RANDOM_IFLUSH_1,
	XFS_RANDOM_IFLUSH_2,
	XFS_RANDOM_IFLUSH_3,
	XFS_RANDOM_IFLUSH_4,
	XFS_RANDOM_IFLUSH_5,
	XFS_RANDOM_IFLUSH_6,
	XFS_RANDOM_DA_READ_BUF,
	XFS_RANDOM_BTREE_CHECK_LBLOCK,
	XFS_RANDOM_BTREE_CHECK_SBLOCK,
	XFS_RANDOM_ALLOC_READ_AGF,
	XFS_RANDOM_IALLOC_READ_AGI,
	XFS_RANDOM_ITOBP_INOTOBP,
	XFS_RANDOM_IUNLINK,
	XFS_RANDOM_IUNLINK_REMOVE,
	XFS_RANDOM_DIR_INO_VALIDATE,
	XFS_RANDOM_BULKSTAT_READ_CHUNK,
	XFS_RANDOM_IODONE_IOERR,
	XFS_RANDOM_STRATREAD_IOERR,
	XFS_RANDOM_STRATCMPL_IOERR,
	XFS_RANDOM_DIOWRITE_IOERR,
	XFS_RANDOM_BMAPIFORMAT,
	XFS_RANDOM_FREE_EXTENT,
	XFS_RANDOM_RMAP_FINISH_ONE,
	XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE,
	XFS_RANDOM_REFCOUNT_FINISH_ONE,
	XFS_RANDOM_BMAP_FINISH_ONE,
	XFS_RANDOM_AG_RESV_CRITICAL,
	XFS_RANDOM_DROP_WRITES,
	XFS_RANDOM_LOG_BAD_CRC,
};

struct xfs_errortag_attr {
	struct attribute	attr;
	unsigned int		tag;
};

static inline struct xfs_errortag_attr *
to_attr(struct attribute *attr)
{
	return container_of(attr, struct xfs_errortag_attr, attr);
}

static inline struct xfs_mount *
to_mp(struct kobject *kobject)
{
	struct xfs_kobj *kobj = to_kobj(kobject);

	return container_of(kobj, struct xfs_mount, m_errortag_kobj);
}

STATIC ssize_t
xfs_errortag_attr_store(
	struct kobject		*kobject,
	struct attribute	*attr,
	const char		*buf,
	size_t			count)
{
	struct xfs_mount	*mp = to_mp(kobject);
	struct xfs_errortag_attr *xfs_attr = to_attr(attr);
	int			ret;
	unsigned int		val;

	if (strcmp(buf, "default") == 0) {
		val = xfs_errortag_random_default[xfs_attr->tag];
	} else {
		ret = kstrtouint(buf, 0, &val);
		if (ret)
			return ret;
	}

	ret = xfs_errortag_set(mp, xfs_attr->tag, val);
	if (ret)
		return ret;
	return count;
}

STATIC ssize_t
xfs_errortag_attr_show(
	struct kobject		*kobject,
	struct attribute	*attr,
	char			*buf)
{
	struct xfs_mount	*mp = to_mp(kobject);
	struct xfs_errortag_attr *xfs_attr = to_attr(attr);

	return snprintf(buf, PAGE_SIZE, "%u\n",
			xfs_errortag_get(mp, xfs_attr->tag));
}

static const struct sysfs_ops xfs_errortag_sysfs_ops = {
	.show = xfs_errortag_attr_show,
	.store = xfs_errortag_attr_store,
};

#define XFS_ERRORTAG_ATTR_RW(_name, _tag) \
static struct xfs_errortag_attr xfs_errortag_attr_##_name = {		\
	.attr = {.name = __stringify(_name),				\
		 .mode = VERIFY_OCTAL_PERMISSIONS(S_IWUSR | S_IRUGO) },	\
	.tag	= (_tag),						\
}

#define XFS_ERRORTAG_ATTR_LIST(_name) &xfs_errortag_attr_##_name.attr

XFS_ERRORTAG_ATTR_RW(noerror,		XFS_ERRTAG_NOERROR);
XFS_ERRORTAG_ATTR_RW(iflush1,		XFS_ERRTAG_IFLUSH_1);
XFS_ERRORTAG_ATTR_RW(iflush2,		XFS_ERRTAG_IFLUSH_2);
XFS_ERRORTAG_ATTR_RW(iflush3,		XFS_ERRTAG_IFLUSH_3);
XFS_ERRORTAG_ATTR_RW(iflush4,		XFS_ERRTAG_IFLUSH_4);
XFS_ERRORTAG_ATTR_RW(iflush5,		XFS_ERRTAG_IFLUSH_5);
XFS_ERRORTAG_ATTR_RW(iflush6,		XFS_ERRTAG_IFLUSH_6);
XFS_ERRORTAG_ATTR_RW(dareadbuf,		XFS_ERRTAG_DA_READ_BUF);
XFS_ERRORTAG_ATTR_RW(btree_chk_lblk,	XFS_ERRTAG_BTREE_CHECK_LBLOCK);
XFS_ERRORTAG_ATTR_RW(btree_chk_sblk,	XFS_ERRTAG_BTREE_CHECK_SBLOCK);
XFS_ERRORTAG_ATTR_RW(readagf,		XFS_ERRTAG_ALLOC_READ_AGF);
XFS_ERRORTAG_ATTR_RW(readagi,		XFS_ERRTAG_IALLOC_READ_AGI);
XFS_ERRORTAG_ATTR_RW(itobp,		XFS_ERRTAG_ITOBP_INOTOBP);
XFS_ERRORTAG_ATTR_RW(iunlink,		XFS_ERRTAG_IUNLINK);
XFS_ERRORTAG_ATTR_RW(iunlinkrm,		XFS_ERRTAG_IUNLINK_REMOVE);
XFS_ERRORTAG_ATTR_RW(dirinovalid,	XFS_ERRTAG_DIR_INO_VALIDATE);
XFS_ERRORTAG_ATTR_RW(bulkstat,		XFS_ERRTAG_BULKSTAT_READ_CHUNK);
XFS_ERRORTAG_ATTR_RW(logiodone,		XFS_ERRTAG_IODONE_IOERR);
XFS_ERRORTAG_ATTR_RW(stratread,		XFS_ERRTAG_STRATREAD_IOERR);
XFS_ERRORTAG_ATTR_RW(stratcmpl,		XFS_ERRTAG_STRATCMPL_IOERR);
XFS_ERRORTAG_ATTR_RW(diowrite,		XFS_ERRTAG_DIOWRITE_IOERR);
XFS_ERRORTAG_ATTR_RW(bmapifmt,		XFS_ERRTAG_BMAPIFORMAT);
XFS_ERRORTAG_ATTR_RW(free_extent,	XFS_ERRTAG_FREE_EXTENT);
XFS_ERRORTAG_ATTR_RW(rmap_finish_one,	XFS_ERRTAG_RMAP_FINISH_ONE);
XFS_ERRORTAG_ATTR_RW(refcount_continue_update,	XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE);
XFS_ERRORTAG_ATTR_RW(refcount_finish_one,	XFS_ERRTAG_REFCOUNT_FINISH_ONE);
XFS_ERRORTAG_ATTR_RW(bmap_finish_one,	XFS_ERRTAG_BMAP_FINISH_ONE);
XFS_ERRORTAG_ATTR_RW(ag_resv_critical,	XFS_ERRTAG_AG_RESV_CRITICAL);
XFS_ERRORTAG_ATTR_RW(drop_writes,	XFS_ERRTAG_DROP_WRITES);
XFS_ERRORTAG_ATTR_RW(log_bad_crc,	XFS_ERRTAG_LOG_BAD_CRC);

static struct attribute *xfs_errortag_attrs[] = {
	XFS_ERRORTAG_ATTR_LIST(noerror),
	XFS_ERRORTAG_ATTR_LIST(iflush1),
	XFS_ERRORTAG_ATTR_LIST(iflush2),
	XFS_ERRORTAG_ATTR_LIST(iflush3),
	XFS_ERRORTAG_ATTR_LIST(iflush4),
	XFS_ERRORTAG_ATTR_LIST(iflush5),
	XFS_ERRORTAG_ATTR_LIST(iflush6),
	XFS_ERRORTAG_ATTR_LIST(dareadbuf),
	XFS_ERRORTAG_ATTR_LIST(btree_chk_lblk),
	XFS_ERRORTAG_ATTR_LIST(btree_chk_sblk),
	XFS_ERRORTAG_ATTR_LIST(readagf),
	XFS_ERRORTAG_ATTR_LIST(readagi),
	XFS_ERRORTAG_ATTR_LIST(itobp),
	XFS_ERRORTAG_ATTR_LIST(iunlink),
	XFS_ERRORTAG_ATTR_LIST(iunlinkrm),
	XFS_ERRORTAG_ATTR_LIST(dirinovalid),
	XFS_ERRORTAG_ATTR_LIST(bulkstat),
	XFS_ERRORTAG_ATTR_LIST(logiodone),
	XFS_ERRORTAG_ATTR_LIST(stratread),
	XFS_ERRORTAG_ATTR_LIST(stratcmpl),
	XFS_ERRORTAG_ATTR_LIST(diowrite),
	XFS_ERRORTAG_ATTR_LIST(bmapifmt),
	XFS_ERRORTAG_ATTR_LIST(free_extent),
	XFS_ERRORTAG_ATTR_LIST(rmap_finish_one),
	XFS_ERRORTAG_ATTR_LIST(refcount_continue_update),
	XFS_ERRORTAG_ATTR_LIST(refcount_finish_one),
	XFS_ERRORTAG_ATTR_LIST(bmap_finish_one),
	XFS_ERRORTAG_ATTR_LIST(ag_resv_critical),
	XFS_ERRORTAG_ATTR_LIST(drop_writes),
	XFS_ERRORTAG_ATTR_LIST(log_bad_crc),
	NULL,
};

struct kobj_type xfs_errortag_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_errortag_sysfs_ops,
	.default_attrs = xfs_errortag_attrs,
};

int
xfs_errortag_init(
	struct xfs_mount	*mp)
{
	mp->m_errortag = kmem_zalloc(sizeof(unsigned int) * XFS_ERRTAG_MAX,
			KM_SLEEP | KM_MAYFAIL);
	if (!mp->m_errortag)
		return -ENOMEM;

	return xfs_sysfs_init(&mp->m_errortag_kobj, &xfs_errortag_ktype,
			       &mp->m_kobj, "errortag");
}

void
xfs_errortag_del(
	struct xfs_mount	*mp)
{
	xfs_sysfs_del(&mp->m_errortag_kobj);
	kmem_free(mp->m_errortag);
}

bool
xfs_errortag_test(
	struct xfs_mount	*mp,
	const char		*expression,
	const char		*file,
	int			line,
	unsigned int		error_tag)
{
	unsigned int		randfactor;

	/*
	 * To be able to use error injection anywhere, we need to ensure error
	 * injection mechanism is already initialized.
	 *
	 * Code paths like I/O completion can be called before the
	 * initialization is complete, but be able to inject errors in such
	 * places is still useful.
	 */
	if (!mp->m_errortag)
		return false;

	ASSERT(error_tag < XFS_ERRTAG_MAX);
	randfactor = mp->m_errortag[error_tag];
	if (!randfactor || prandom_u32() % randfactor)
		return false;

	xfs_warn_ratelimited(mp,
"Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
			expression, file, line, mp->m_fsname);
	return true;
}

int
xfs_errortag_get(
	struct xfs_mount	*mp,
	unsigned int		error_tag)
{
	if (error_tag >= XFS_ERRTAG_MAX)
		return -EINVAL;

	return mp->m_errortag[error_tag];
}

int
xfs_errortag_set(
	struct xfs_mount	*mp,
	unsigned int		error_tag,
	unsigned int		tag_value)
{
	if (error_tag >= XFS_ERRTAG_MAX)
		return -EINVAL;

	mp->m_errortag[error_tag] = tag_value;
	return 0;
}

int
xfs_errortag_add(
	struct xfs_mount	*mp,
	unsigned int		error_tag)
{
	if (error_tag >= XFS_ERRTAG_MAX)
		return -EINVAL;

	return xfs_errortag_set(mp, error_tag,
			xfs_errortag_random_default[error_tag]);
}

int
xfs_errortag_clearall(
	struct xfs_mount	*mp)
{
	memset(mp->m_errortag, 0, sizeof(unsigned int) * XFS_ERRTAG_MAX);
	return 0;
}
#endif /* DEBUG */

void
xfs_error_report(
	const char		*tag,
	int			level,
	struct xfs_mount	*mp,
	const char		*filename,
	int			linenum,
	void			*ra)
{
	if (level <= xfs_error_level) {
		xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
		"Internal error %s at line %d of file %s.  Caller %pS",
			    tag, linenum, filename, ra);

		xfs_stack_trace();
	}
}

void
xfs_corruption_error(
	const char		*tag,
	int			level,
	struct xfs_mount	*mp,
	void			*p,
	const char		*filename,
	int			linenum,
	void			*ra)
{
	if (level <= xfs_error_level)
		xfs_hex_dump(p, 64);
	xfs_error_report(tag, level, mp, filename, linenum, ra);
	xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
}

/*
 * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
 * values, and omit the stack trace unless the error level is tuned high.
 */
void
xfs_verifier_error(
	struct xfs_buf		*bp)
{
	struct xfs_mount *mp = bp->b_target->bt_mount;

	xfs_alert(mp, "Metadata %s detected at %pS, %s block 0x%llx",
		  bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
		  __return_address, bp->b_ops->name, bp->b_bn);

	xfs_alert(mp, "Unmount and run xfs_repair");

	if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
		xfs_alert(mp, "First 64 bytes of corrupted metadata buffer:");
		xfs_hex_dump(xfs_buf_offset(bp, 0), 64);
	}

	if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
		xfs_stack_trace();
}
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4	17	*/
1da177e4	18	#include "xfs.h"
a4fbe6ab	19	#include "xfs_format.h"
a844f451	20	#include "xfs_fs.h"
239880ef DC	21	#include "xfs_log_format.h"
239880ef DC	22	#include "xfs_trans_resv.h"
1da177e4	23	#include "xfs_mount.h"
1da177e4	24	#include "xfs_error.h"
c6840101	25	#include "xfs_sysfs.h"
1da177e4 LT	26
	27	#ifdef DEBUG
	28
31965ef3 DW	29	static unsigned int xfs_errortag_random_default[] = {
	30	XFS_RANDOM_DEFAULT,
	31	XFS_RANDOM_IFLUSH_1,
	32	XFS_RANDOM_IFLUSH_2,
	33	XFS_RANDOM_IFLUSH_3,
	34	XFS_RANDOM_IFLUSH_4,
	35	XFS_RANDOM_IFLUSH_5,
	36	XFS_RANDOM_IFLUSH_6,
	37	XFS_RANDOM_DA_READ_BUF,
	38	XFS_RANDOM_BTREE_CHECK_LBLOCK,
	39	XFS_RANDOM_BTREE_CHECK_SBLOCK,
	40	XFS_RANDOM_ALLOC_READ_AGF,
	41	XFS_RANDOM_IALLOC_READ_AGI,
	42	XFS_RANDOM_ITOBP_INOTOBP,
	43	XFS_RANDOM_IUNLINK,
	44	XFS_RANDOM_IUNLINK_REMOVE,
	45	XFS_RANDOM_DIR_INO_VALIDATE,
	46	XFS_RANDOM_BULKSTAT_READ_CHUNK,
	47	XFS_RANDOM_IODONE_IOERR,
	48	XFS_RANDOM_STRATREAD_IOERR,
	49	XFS_RANDOM_STRATCMPL_IOERR,
	50	XFS_RANDOM_DIOWRITE_IOERR,
	51	XFS_RANDOM_BMAPIFORMAT,
	52	XFS_RANDOM_FREE_EXTENT,
	53	XFS_RANDOM_RMAP_FINISH_ONE,
	54	XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE,
	55	XFS_RANDOM_REFCOUNT_FINISH_ONE,
	56	XFS_RANDOM_BMAP_FINISH_ONE,
	57	XFS_RANDOM_AG_RESV_CRITICAL,
f8c47250	58	XFS_RANDOM_DROP_WRITES,
3e88a007	59	XFS_RANDOM_LOG_BAD_CRC,
31965ef3	60	};
1da177e4	61
c6840101 DW	62	struct xfs_errortag_attr {
	63	struct attribute attr;
	64	unsigned int tag;
	65	};
	66
	67	static inline struct xfs_errortag_attr *
	68	to_attr(struct attribute *attr)
	69	{
	70	return container_of(attr, struct xfs_errortag_attr, attr);
	71	}
	72
	73	static inline struct xfs_mount *
	74	to_mp(struct kobject *kobject)
	75	{
	76	struct xfs_kobj *kobj = to_kobj(kobject);
	77
	78	return container_of(kobj, struct xfs_mount, m_errortag_kobj);
	79	}
	80
	81	STATIC ssize_t
	82	xfs_errortag_attr_store(
	83	struct kobject *kobject,
	84	struct attribute *attr,
	85	const char *buf,
	86	size_t count)
	87	{
	88	struct xfs_mount *mp = to_mp(kobject);
	89	struct xfs_errortag_attr *xfs_attr = to_attr(attr);
	90	int ret;
	91	unsigned int val;
	92
	93	if (strcmp(buf, "default") == 0) {
	94	val = xfs_errortag_random_default[xfs_attr->tag];
	95	} else {
	96	ret = kstrtouint(buf, 0, &val);
	97	if (ret)
	98	return ret;
	99	}
	100
	101	ret = xfs_errortag_set(mp, xfs_attr->tag, val);
	102	if (ret)
	103	return ret;
	104	return count;
	105	}
	106
	107	STATIC ssize_t
	108	xfs_errortag_attr_show(
	109	struct kobject *kobject,
	110	struct attribute *attr,
	111	char *buf)
	112	{
	113	struct xfs_mount *mp = to_mp(kobject);
	114	struct xfs_errortag_attr *xfs_attr = to_attr(attr);
	115
	116	return snprintf(buf, PAGE_SIZE, "%u\n",
	117	xfs_errortag_get(mp, xfs_attr->tag));
	118	}
	119
	120	static const struct sysfs_ops xfs_errortag_sysfs_ops = {
	121	.show = xfs_errortag_attr_show,
	122	.store = xfs_errortag_attr_store,
	123	};
	124
	125	#define XFS_ERRORTAG_ATTR_RW(_name, _tag) \
126	static struct xfs_errortag_attr xfs_errortag_attr_##_name = { \
127	.attr = {.name = __stringify(_name), \
128	.mode = VERIFY_OCTAL_PERMISSIONS(S_IWUSR \| S_IRUGO) }, \
129	.tag = (_tag), \
130	}
131
132	#define XFS_ERRORTAG_ATTR_LIST(_name) &xfs_errortag_attr_##_name.attr
133
134	XFS_ERRORTAG_ATTR_RW(noerror, XFS_ERRTAG_NOERROR);
135	XFS_ERRORTAG_ATTR_RW(iflush1, XFS_ERRTAG_IFLUSH_1);
136	XFS_ERRORTAG_ATTR_RW(iflush2, XFS_ERRTAG_IFLUSH_2);
137	XFS_ERRORTAG_ATTR_RW(iflush3, XFS_ERRTAG_IFLUSH_3);
138	XFS_ERRORTAG_ATTR_RW(iflush4, XFS_ERRTAG_IFLUSH_4);
139	XFS_ERRORTAG_ATTR_RW(iflush5, XFS_ERRTAG_IFLUSH_5);
140	XFS_ERRORTAG_ATTR_RW(iflush6, XFS_ERRTAG_IFLUSH_6);
141	XFS_ERRORTAG_ATTR_RW(dareadbuf, XFS_ERRTAG_DA_READ_BUF);
142	XFS_ERRORTAG_ATTR_RW(btree_chk_lblk, XFS_ERRTAG_BTREE_CHECK_LBLOCK);
143	XFS_ERRORTAG_ATTR_RW(btree_chk_sblk, XFS_ERRTAG_BTREE_CHECK_SBLOCK);
144	XFS_ERRORTAG_ATTR_RW(readagf, XFS_ERRTAG_ALLOC_READ_AGF);
145	XFS_ERRORTAG_ATTR_RW(readagi, XFS_ERRTAG_IALLOC_READ_AGI);
146	XFS_ERRORTAG_ATTR_RW(itobp, XFS_ERRTAG_ITOBP_INOTOBP);
147	XFS_ERRORTAG_ATTR_RW(iunlink, XFS_ERRTAG_IUNLINK);
148	XFS_ERRORTAG_ATTR_RW(iunlinkrm, XFS_ERRTAG_IUNLINK_REMOVE);
149	XFS_ERRORTAG_ATTR_RW(dirinovalid, XFS_ERRTAG_DIR_INO_VALIDATE);
150	XFS_ERRORTAG_ATTR_RW(bulkstat, XFS_ERRTAG_BULKSTAT_READ_CHUNK);
151	XFS_ERRORTAG_ATTR_RW(logiodone, XFS_ERRTAG_IODONE_IOERR);
152	XFS_ERRORTAG_ATTR_RW(stratread, XFS_ERRTAG_STRATREAD_IOERR);
153	XFS_ERRORTAG_ATTR_RW(stratcmpl, XFS_ERRTAG_STRATCMPL_IOERR);
154	XFS_ERRORTAG_ATTR_RW(diowrite, XFS_ERRTAG_DIOWRITE_IOERR);
155	XFS_ERRORTAG_ATTR_RW(bmapifmt, XFS_ERRTAG_BMAPIFORMAT);
156	XFS_ERRORTAG_ATTR_RW(free_extent, XFS_ERRTAG_FREE_EXTENT);
157	XFS_ERRORTAG_ATTR_RW(rmap_finish_one, XFS_ERRTAG_RMAP_FINISH_ONE);
158	XFS_ERRORTAG_ATTR_RW(refcount_continue_update, XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE);
159	XFS_ERRORTAG_ATTR_RW(refcount_finish_one, XFS_ERRTAG_REFCOUNT_FINISH_ONE);
160	XFS_ERRORTAG_ATTR_RW(bmap_finish_one, XFS_ERRTAG_BMAP_FINISH_ONE);
161	XFS_ERRORTAG_ATTR_RW(ag_resv_critical, XFS_ERRTAG_AG_RESV_CRITICAL);
f8c47250	162	XFS_ERRORTAG_ATTR_RW(drop_writes, XFS_ERRTAG_DROP_WRITES);
3e88a007	163	XFS_ERRORTAG_ATTR_RW(log_bad_crc, XFS_ERRTAG_LOG_BAD_CRC);
c6840101 DW	164
	165	static struct attribute *xfs_errortag_attrs[] = {
	166	XFS_ERRORTAG_ATTR_LIST(noerror),
	167	XFS_ERRORTAG_ATTR_LIST(iflush1),
	168	XFS_ERRORTAG_ATTR_LIST(iflush2),
	169	XFS_ERRORTAG_ATTR_LIST(iflush3),
	170	XFS_ERRORTAG_ATTR_LIST(iflush4),
	171	XFS_ERRORTAG_ATTR_LIST(iflush5),
	172	XFS_ERRORTAG_ATTR_LIST(iflush6),
	173	XFS_ERRORTAG_ATTR_LIST(dareadbuf),
	174	XFS_ERRORTAG_ATTR_LIST(btree_chk_lblk),
	175	XFS_ERRORTAG_ATTR_LIST(btree_chk_sblk),
	176	XFS_ERRORTAG_ATTR_LIST(readagf),
	177	XFS_ERRORTAG_ATTR_LIST(readagi),
	178	XFS_ERRORTAG_ATTR_LIST(itobp),
	179	XFS_ERRORTAG_ATTR_LIST(iunlink),
	180	XFS_ERRORTAG_ATTR_LIST(iunlinkrm),
	181	XFS_ERRORTAG_ATTR_LIST(dirinovalid),
	182	XFS_ERRORTAG_ATTR_LIST(bulkstat),
	183	XFS_ERRORTAG_ATTR_LIST(logiodone),
	184	XFS_ERRORTAG_ATTR_LIST(stratread),
	185	XFS_ERRORTAG_ATTR_LIST(stratcmpl),
	186	XFS_ERRORTAG_ATTR_LIST(diowrite),
	187	XFS_ERRORTAG_ATTR_LIST(bmapifmt),
	188	XFS_ERRORTAG_ATTR_LIST(free_extent),
	189	XFS_ERRORTAG_ATTR_LIST(rmap_finish_one),
	190	XFS_ERRORTAG_ATTR_LIST(refcount_continue_update),
	191	XFS_ERRORTAG_ATTR_LIST(refcount_finish_one),
	192	XFS_ERRORTAG_ATTR_LIST(bmap_finish_one),
	193	XFS_ERRORTAG_ATTR_LIST(ag_resv_critical),
f8c47250	194	XFS_ERRORTAG_ATTR_LIST(drop_writes),
3e88a007	195	XFS_ERRORTAG_ATTR_LIST(log_bad_crc),
c6840101 DW	196	NULL,
	197	};
	198
	199	struct kobj_type xfs_errortag_ktype = {
	200	.release = xfs_sysfs_release,
	201	.sysfs_ops = &xfs_errortag_sysfs_ops,
	202	.default_attrs = xfs_errortag_attrs,
	203	};
	204
1da177e4	205	int
31965ef3 DW	206	xfs_errortag_init(
31965ef3 DW	207	struct xfs_mount *mp)
1da177e4	208	{
31965ef3 DW	209	mp->m_errortag = kmem_zalloc(sizeof(unsigned int) * XFS_ERRTAG_MAX,
	210	KM_SLEEP \| KM_MAYFAIL);
	211	if (!mp->m_errortag)
	212	return -ENOMEM;
c6840101 DW	213
	214	return xfs_sysfs_init(&mp->m_errortag_kobj, &xfs_errortag_ktype,
	215	&mp->m_kobj, "errortag");
31965ef3	216	}
1da177e4	217
31965ef3 DW	218	void
	219	xfs_errortag_del(
	220	struct xfs_mount *mp)
	221	{
c6840101	222	xfs_sysfs_del(&mp->m_errortag_kobj);
31965ef3 DW	223	kmem_free(mp->m_errortag);
31965ef3 DW	224	}
1da177e4	225
31965ef3 DW	226	bool
	227	xfs_errortag_test(
	228	struct xfs_mount *mp,
	229	const char *expression,
	230	const char *file,
	231	int line,
	232	unsigned int error_tag)
	233	{
	234	unsigned int randfactor;
1da177e4	235
d04c241c CM	236	/*
	237	* To be able to use error injection anywhere, we need to ensure error
	238	* injection mechanism is already initialized.
	239	*
	240	* Code paths like I/O completion can be called before the
	241	* initialization is complete, but be able to inject errors in such
	242	* places is still useful.
	243	*/
	244	if (!mp->m_errortag)
	245	return false;
	246
31965ef3 DW	247	ASSERT(error_tag < XFS_ERRTAG_MAX);
	248	randfactor = mp->m_errortag[error_tag];
	249	if (!randfactor \|\| prandom_u32() % randfactor)
	250	return false;
1da177e4	251
31965ef3 DW	252	xfs_warn_ratelimited(mp,
	253	"Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
	254	expression, file, line, mp->m_fsname);
	255	return true;
1da177e4 LT	256	}
1da177e4 LT	257
c6840101 DW	258	int
	259	xfs_errortag_get(
	260	struct xfs_mount *mp,
	261	unsigned int error_tag)
	262	{
	263	if (error_tag >= XFS_ERRTAG_MAX)
	264	return -EINVAL;
	265
	266	return mp->m_errortag[error_tag];
	267	}
	268
1da177e4	269	int
31965ef3 DW	270	xfs_errortag_set(
	271	struct xfs_mount *mp,
	272	unsigned int error_tag,
	273	unsigned int tag_value)
1da177e4	274	{
128f24d5 DW	275	if (error_tag >= XFS_ERRTAG_MAX)
	276	return -EINVAL;
	277
31965ef3 DW	278	mp->m_errortag[error_tag] = tag_value;
31965ef3 DW	279	return 0;
1da177e4 LT	280	}
1da177e4 LT	281
1da177e4	282	int
31965ef3 DW	283	xfs_errortag_add(
	284	struct xfs_mount *mp,
	285	unsigned int error_tag)
1da177e4	286	{
31965ef3 DW	287	if (error_tag >= XFS_ERRTAG_MAX)
31965ef3 DW	288	return -EINVAL;
1da177e4	289
31965ef3 DW	290	return xfs_errortag_set(mp, error_tag,
	291	xfs_errortag_random_default[error_tag]);
	292	}
1da177e4	293
31965ef3 DW	294	int
	295	xfs_errortag_clearall(
	296	struct xfs_mount *mp)
	297	{
	298	memset(mp->m_errortag, 0, sizeof(unsigned int) * XFS_ERRTAG_MAX);
1da177e4 LT	299	return 0;
1da177e4 LT	300	}
1550d0b0	301	#endif /* DEBUG */
1da177e4	302
1da177e4 LT	303	void
1da177e4 LT	304	xfs_error_report(
a0e856b0 AE	305	const char *tag,
	306	int level,
	307	struct xfs_mount *mp,
	308	const char *filename,
	309	int linenum,
fc51c2b5	310	void *ra)
1da177e4 LT	311	{
1da177e4 LT	312	if (level <= xfs_error_level) {
6a19d939	313	xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
65dd297a	314	"Internal error %s at line %d of file %s. Caller %pS",
a0e856b0	315	tag, linenum, filename, ra);
1da177e4 LT	316
	317	xfs_stack_trace();
	318	}
	319	}
	320
1da177e4 LT	321	void
1da177e4 LT	322	xfs_corruption_error(
a0e856b0 AE	323	const char *tag,
	324	int level,
	325	struct xfs_mount *mp,
	326	void *p,
	327	const char *filename,
	328	int linenum,
fc51c2b5	329	void *ra)
1da177e4 LT	330	{
1da177e4 LT	331	if (level <= xfs_error_level)
a2050646	332	xfs_hex_dump(p, 64);
a0e856b0	333	xfs_error_report(tag, level, mp, filename, linenum, ra);
65333b4c	334	xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
1da177e4	335	}
ca23f8fd ES	336
	337	/*
	338	* Warnings specifically for verifier errors. Differentiate CRC vs. invalid
	339	* values, and omit the stack trace unless the error level is tuned high.
	340	*/
	341	void
	342	xfs_verifier_error(
	343	struct xfs_buf *bp)
	344	{
	345	struct xfs_mount *mp = bp->b_target->bt_mount;
	346
f33d6b3b	347	xfs_alert(mp, "Metadata %s detected at %pS, %s block 0x%llx",
2451337d	348	bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
233135b7	349	__return_address, bp->b_ops->name, bp->b_bn);
ca23f8fd ES	350
	351	xfs_alert(mp, "Unmount and run xfs_repair");
	352
	353	if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
	354	xfs_alert(mp, "First 64 bytes of corrupted metadata buffer:");
	355	xfs_hex_dump(xfs_buf_offset(bp, 0), 64);
	356	}
	357
	358	if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
	359	xfs_stack_trace();
	360	}