[linux-2.6-block.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_errortag.h"
#include "xfs_error.h"
#include "xfs_sysfs.h"
#include "xfs_inode.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,
	XFS_RANDOM_LOG_ITEM_PIN,
	XFS_RANDOM_BUF_LRU_REF,
};

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);
XFS_ERRORTAG_ATTR_RW(log_item_pin,	XFS_ERRTAG_LOG_ITEM_PIN);
XFS_ERRORTAG_ATTR_RW(buf_lru_ref,	XFS_ERRTAG_BUF_LRU_REF);

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),
	XFS_ERRORTAG_ATTR_LIST(log_item_pin),
	XFS_ERRORTAG_ATTR_LIST(buf_lru_ref),
	NULL,
};

static 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,
	xfs_failaddr_t		failaddr)
{
	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, failaddr);

		xfs_stack_trace();
	}
}

void
xfs_corruption_error(
	const char		*tag,
	int			level,
	struct xfs_mount	*mp,
	void			*p,
	const char		*filename,
	int			linenum,
	xfs_failaddr_t		failaddr)
{
	if (level <= xfs_error_level)
		xfs_hex_dump(p, XFS_CORRUPTION_DUMP_LEN);
	xfs_error_report(tag, level, mp, filename, linenum, failaddr);
	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,
	int			error,
	xfs_failaddr_t		failaddr)
{
	struct xfs_mount	*mp = bp->b_target->bt_mount;
	xfs_failaddr_t		fa;

	fa = failaddr ? failaddr : __return_address;
	__xfs_buf_ioerror(bp, error, fa);

	xfs_alert(mp, "Metadata %s detected at %pS, %s block 0x%llx",
		  bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
		  fa, 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 %d bytes of corrupted metadata buffer:",
				XFS_CORRUPTION_DUMP_LEN);
		xfs_hex_dump(xfs_buf_offset(bp, 0), XFS_CORRUPTION_DUMP_LEN);
	}

	if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
		xfs_stack_trace();
}

/*
 * Warnings for inode corruption problems.  Don't bother with the stack
 * trace unless the error level is turned up high.
 */
void
xfs_inode_verifier_error(
	struct xfs_inode	*ip,
	int			error,
	const char		*name,
	void			*buf,
	size_t			bufsz,
	xfs_failaddr_t		failaddr)
{
	struct xfs_mount	*mp = ip->i_mount;
	xfs_failaddr_t		fa;
	int			sz;

	fa = failaddr ? failaddr : __return_address;

	xfs_alert(mp, "Metadata %s detected at %pS, inode 0x%llx %s",
		  error == -EFSBADCRC ? "CRC error" : "corruption",
		  fa, ip->i_ino, name);

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

	if (buf && xfs_error_level >= XFS_ERRLEVEL_LOW) {
		sz = min_t(size_t, XFS_CORRUPTION_DUMP_LEN, bufsz);
		xfs_alert(mp, "First %d bytes of corrupted metadata buffer:",
				sz);
		xfs_hex_dump(buf, sz);
	}

	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"
e9e899a2	24	#include "xfs_errortag.h"
1da177e4	25	#include "xfs_error.h"
c6840101	26	#include "xfs_sysfs.h"
22431bf3	27	#include "xfs_inode.h"
1da177e4 LT	28
	29	#ifdef DEBUG
	30
31965ef3 DW	31	static unsigned int xfs_errortag_random_default[] = {
	32	XFS_RANDOM_DEFAULT,
	33	XFS_RANDOM_IFLUSH_1,
	34	XFS_RANDOM_IFLUSH_2,
	35	XFS_RANDOM_IFLUSH_3,
	36	XFS_RANDOM_IFLUSH_4,
	37	XFS_RANDOM_IFLUSH_5,
	38	XFS_RANDOM_IFLUSH_6,
	39	XFS_RANDOM_DA_READ_BUF,
	40	XFS_RANDOM_BTREE_CHECK_LBLOCK,
	41	XFS_RANDOM_BTREE_CHECK_SBLOCK,
	42	XFS_RANDOM_ALLOC_READ_AGF,
	43	XFS_RANDOM_IALLOC_READ_AGI,
	44	XFS_RANDOM_ITOBP_INOTOBP,
	45	XFS_RANDOM_IUNLINK,
	46	XFS_RANDOM_IUNLINK_REMOVE,
	47	XFS_RANDOM_DIR_INO_VALIDATE,
	48	XFS_RANDOM_BULKSTAT_READ_CHUNK,
	49	XFS_RANDOM_IODONE_IOERR,
	50	XFS_RANDOM_STRATREAD_IOERR,
	51	XFS_RANDOM_STRATCMPL_IOERR,
	52	XFS_RANDOM_DIOWRITE_IOERR,
	53	XFS_RANDOM_BMAPIFORMAT,
	54	XFS_RANDOM_FREE_EXTENT,
	55	XFS_RANDOM_RMAP_FINISH_ONE,
	56	XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE,
	57	XFS_RANDOM_REFCOUNT_FINISH_ONE,
	58	XFS_RANDOM_BMAP_FINISH_ONE,
	59	XFS_RANDOM_AG_RESV_CRITICAL,
f8c47250	60	XFS_RANDOM_DROP_WRITES,
3e88a007	61	XFS_RANDOM_LOG_BAD_CRC,
7f4d01f3	62	XFS_RANDOM_LOG_ITEM_PIN,
7561d27e	63	XFS_RANDOM_BUF_LRU_REF,
31965ef3	64	};
1da177e4	65
c6840101 DW	66	struct xfs_errortag_attr {
	67	struct attribute attr;
	68	unsigned int tag;
	69	};
	70
	71	static inline struct xfs_errortag_attr *
	72	to_attr(struct attribute *attr)
	73	{
	74	return container_of(attr, struct xfs_errortag_attr, attr);
	75	}
	76
	77	static inline struct xfs_mount *
	78	to_mp(struct kobject *kobject)
	79	{
	80	struct xfs_kobj *kobj = to_kobj(kobject);
	81
	82	return container_of(kobj, struct xfs_mount, m_errortag_kobj);
	83	}
	84
	85	STATIC ssize_t
	86	xfs_errortag_attr_store(
	87	struct kobject *kobject,
	88	struct attribute *attr,
	89	const char *buf,
	90	size_t count)
	91	{
	92	struct xfs_mount *mp = to_mp(kobject);
	93	struct xfs_errortag_attr *xfs_attr = to_attr(attr);
	94	int ret;
	95	unsigned int val;
	96
	97	if (strcmp(buf, "default") == 0) {
	98	val = xfs_errortag_random_default[xfs_attr->tag];
	99	} else {
	100	ret = kstrtouint(buf, 0, &val);
	101	if (ret)
	102	return ret;
	103	}
	104
	105	ret = xfs_errortag_set(mp, xfs_attr->tag, val);
	106	if (ret)
	107	return ret;
	108	return count;
	109	}
	110
	111	STATIC ssize_t
	112	xfs_errortag_attr_show(
	113	struct kobject *kobject,
	114	struct attribute *attr,
	115	char *buf)
	116	{
	117	struct xfs_mount *mp = to_mp(kobject);
	118	struct xfs_errortag_attr *xfs_attr = to_attr(attr);
	119
	120	return snprintf(buf, PAGE_SIZE, "%u\n",
	121	xfs_errortag_get(mp, xfs_attr->tag));
	122	}
	123
	124	static const struct sysfs_ops xfs_errortag_sysfs_ops = {
	125	.show = xfs_errortag_attr_show,
	126	.store = xfs_errortag_attr_store,
	127	};
	128
	129	#define XFS_ERRORTAG_ATTR_RW(_name, _tag) \
130	static struct xfs_errortag_attr xfs_errortag_attr_##_name = { \
131	.attr = {.name = __stringify(_name), \
132	.mode = VERIFY_OCTAL_PERMISSIONS(S_IWUSR \| S_IRUGO) }, \
133	.tag = (_tag), \
134	}
135
136	#define XFS_ERRORTAG_ATTR_LIST(_name) &xfs_errortag_attr_##_name.attr
137
138	XFS_ERRORTAG_ATTR_RW(noerror, XFS_ERRTAG_NOERROR);
139	XFS_ERRORTAG_ATTR_RW(iflush1, XFS_ERRTAG_IFLUSH_1);
140	XFS_ERRORTAG_ATTR_RW(iflush2, XFS_ERRTAG_IFLUSH_2);
141	XFS_ERRORTAG_ATTR_RW(iflush3, XFS_ERRTAG_IFLUSH_3);
142	XFS_ERRORTAG_ATTR_RW(iflush4, XFS_ERRTAG_IFLUSH_4);
143	XFS_ERRORTAG_ATTR_RW(iflush5, XFS_ERRTAG_IFLUSH_5);
144	XFS_ERRORTAG_ATTR_RW(iflush6, XFS_ERRTAG_IFLUSH_6);
145	XFS_ERRORTAG_ATTR_RW(dareadbuf, XFS_ERRTAG_DA_READ_BUF);
146	XFS_ERRORTAG_ATTR_RW(btree_chk_lblk, XFS_ERRTAG_BTREE_CHECK_LBLOCK);
147	XFS_ERRORTAG_ATTR_RW(btree_chk_sblk, XFS_ERRTAG_BTREE_CHECK_SBLOCK);
148	XFS_ERRORTAG_ATTR_RW(readagf, XFS_ERRTAG_ALLOC_READ_AGF);
149	XFS_ERRORTAG_ATTR_RW(readagi, XFS_ERRTAG_IALLOC_READ_AGI);
150	XFS_ERRORTAG_ATTR_RW(itobp, XFS_ERRTAG_ITOBP_INOTOBP);
151	XFS_ERRORTAG_ATTR_RW(iunlink, XFS_ERRTAG_IUNLINK);
152	XFS_ERRORTAG_ATTR_RW(iunlinkrm, XFS_ERRTAG_IUNLINK_REMOVE);
153	XFS_ERRORTAG_ATTR_RW(dirinovalid, XFS_ERRTAG_DIR_INO_VALIDATE);
154	XFS_ERRORTAG_ATTR_RW(bulkstat, XFS_ERRTAG_BULKSTAT_READ_CHUNK);
155	XFS_ERRORTAG_ATTR_RW(logiodone, XFS_ERRTAG_IODONE_IOERR);
156	XFS_ERRORTAG_ATTR_RW(stratread, XFS_ERRTAG_STRATREAD_IOERR);
157	XFS_ERRORTAG_ATTR_RW(stratcmpl, XFS_ERRTAG_STRATCMPL_IOERR);
158	XFS_ERRORTAG_ATTR_RW(diowrite, XFS_ERRTAG_DIOWRITE_IOERR);
159	XFS_ERRORTAG_ATTR_RW(bmapifmt, XFS_ERRTAG_BMAPIFORMAT);
160	XFS_ERRORTAG_ATTR_RW(free_extent, XFS_ERRTAG_FREE_EXTENT);
161	XFS_ERRORTAG_ATTR_RW(rmap_finish_one, XFS_ERRTAG_RMAP_FINISH_ONE);
162	XFS_ERRORTAG_ATTR_RW(refcount_continue_update, XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE);
163	XFS_ERRORTAG_ATTR_RW(refcount_finish_one, XFS_ERRTAG_REFCOUNT_FINISH_ONE);
164	XFS_ERRORTAG_ATTR_RW(bmap_finish_one, XFS_ERRTAG_BMAP_FINISH_ONE);
165	XFS_ERRORTAG_ATTR_RW(ag_resv_critical, XFS_ERRTAG_AG_RESV_CRITICAL);
f8c47250	166	XFS_ERRORTAG_ATTR_RW(drop_writes, XFS_ERRTAG_DROP_WRITES);
3e88a007	167	XFS_ERRORTAG_ATTR_RW(log_bad_crc, XFS_ERRTAG_LOG_BAD_CRC);
7f4d01f3	168	XFS_ERRORTAG_ATTR_RW(log_item_pin, XFS_ERRTAG_LOG_ITEM_PIN);
7561d27e	169	XFS_ERRORTAG_ATTR_RW(buf_lru_ref, XFS_ERRTAG_BUF_LRU_REF);
c6840101 DW	170
	171	static struct attribute *xfs_errortag_attrs[] = {
	172	XFS_ERRORTAG_ATTR_LIST(noerror),
	173	XFS_ERRORTAG_ATTR_LIST(iflush1),
	174	XFS_ERRORTAG_ATTR_LIST(iflush2),
	175	XFS_ERRORTAG_ATTR_LIST(iflush3),
	176	XFS_ERRORTAG_ATTR_LIST(iflush4),
	177	XFS_ERRORTAG_ATTR_LIST(iflush5),
	178	XFS_ERRORTAG_ATTR_LIST(iflush6),
	179	XFS_ERRORTAG_ATTR_LIST(dareadbuf),
	180	XFS_ERRORTAG_ATTR_LIST(btree_chk_lblk),
	181	XFS_ERRORTAG_ATTR_LIST(btree_chk_sblk),
	182	XFS_ERRORTAG_ATTR_LIST(readagf),
	183	XFS_ERRORTAG_ATTR_LIST(readagi),
	184	XFS_ERRORTAG_ATTR_LIST(itobp),
	185	XFS_ERRORTAG_ATTR_LIST(iunlink),
	186	XFS_ERRORTAG_ATTR_LIST(iunlinkrm),
	187	XFS_ERRORTAG_ATTR_LIST(dirinovalid),
	188	XFS_ERRORTAG_ATTR_LIST(bulkstat),
	189	XFS_ERRORTAG_ATTR_LIST(logiodone),
	190	XFS_ERRORTAG_ATTR_LIST(stratread),
	191	XFS_ERRORTAG_ATTR_LIST(stratcmpl),
	192	XFS_ERRORTAG_ATTR_LIST(diowrite),
	193	XFS_ERRORTAG_ATTR_LIST(bmapifmt),
	194	XFS_ERRORTAG_ATTR_LIST(free_extent),
	195	XFS_ERRORTAG_ATTR_LIST(rmap_finish_one),
	196	XFS_ERRORTAG_ATTR_LIST(refcount_continue_update),
	197	XFS_ERRORTAG_ATTR_LIST(refcount_finish_one),
	198	XFS_ERRORTAG_ATTR_LIST(bmap_finish_one),
	199	XFS_ERRORTAG_ATTR_LIST(ag_resv_critical),
f8c47250	200	XFS_ERRORTAG_ATTR_LIST(drop_writes),
3e88a007	201	XFS_ERRORTAG_ATTR_LIST(log_bad_crc),
7f4d01f3	202	XFS_ERRORTAG_ATTR_LIST(log_item_pin),
7561d27e	203	XFS_ERRORTAG_ATTR_LIST(buf_lru_ref),
c6840101 DW	204	NULL,
	205	};
	206
4371155e	207	static struct kobj_type xfs_errortag_ktype = {
c6840101 DW	208	.release = xfs_sysfs_release,
	209	.sysfs_ops = &xfs_errortag_sysfs_ops,
	210	.default_attrs = xfs_errortag_attrs,
	211	};
	212
1da177e4	213	int
31965ef3 DW	214	xfs_errortag_init(
31965ef3 DW	215	struct xfs_mount *mp)
1da177e4	216	{
31965ef3 DW	217	mp->m_errortag = kmem_zalloc(sizeof(unsigned int) * XFS_ERRTAG_MAX,
	218	KM_SLEEP \| KM_MAYFAIL);
	219	if (!mp->m_errortag)
	220	return -ENOMEM;
c6840101 DW	221
	222	return xfs_sysfs_init(&mp->m_errortag_kobj, &xfs_errortag_ktype,
	223	&mp->m_kobj, "errortag");
31965ef3	224	}
1da177e4	225
31965ef3 DW	226	void
	227	xfs_errortag_del(
	228	struct xfs_mount *mp)
	229	{
c6840101	230	xfs_sysfs_del(&mp->m_errortag_kobj);
31965ef3 DW	231	kmem_free(mp->m_errortag);
31965ef3 DW	232	}
1da177e4	233
31965ef3 DW	234	bool
	235	xfs_errortag_test(
	236	struct xfs_mount *mp,
	237	const char *expression,
	238	const char *file,
	239	int line,
	240	unsigned int error_tag)
	241	{
	242	unsigned int randfactor;
1da177e4	243
d04c241c CM	244	/*
	245	* To be able to use error injection anywhere, we need to ensure error
	246	* injection mechanism is already initialized.
	247	*
	248	* Code paths like I/O completion can be called before the
	249	* initialization is complete, but be able to inject errors in such
	250	* places is still useful.
	251	*/
	252	if (!mp->m_errortag)
	253	return false;
	254
31965ef3 DW	255	ASSERT(error_tag < XFS_ERRTAG_MAX);
	256	randfactor = mp->m_errortag[error_tag];
	257	if (!randfactor \|\| prandom_u32() % randfactor)
	258	return false;
1da177e4	259
31965ef3 DW	260	xfs_warn_ratelimited(mp,
	261	"Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
	262	expression, file, line, mp->m_fsname);
	263	return true;
1da177e4 LT	264	}
1da177e4 LT	265
c6840101 DW	266	int
	267	xfs_errortag_get(
	268	struct xfs_mount *mp,
	269	unsigned int error_tag)
	270	{
	271	if (error_tag >= XFS_ERRTAG_MAX)
	272	return -EINVAL;
	273
	274	return mp->m_errortag[error_tag];
	275	}
	276
1da177e4	277	int
31965ef3 DW	278	xfs_errortag_set(
	279	struct xfs_mount *mp,
	280	unsigned int error_tag,
	281	unsigned int tag_value)
1da177e4	282	{
128f24d5 DW	283	if (error_tag >= XFS_ERRTAG_MAX)
	284	return -EINVAL;
	285
31965ef3 DW	286	mp->m_errortag[error_tag] = tag_value;
31965ef3 DW	287	return 0;
1da177e4 LT	288	}
1da177e4 LT	289
1da177e4	290	int
31965ef3 DW	291	xfs_errortag_add(
	292	struct xfs_mount *mp,
	293	unsigned int error_tag)
1da177e4	294	{
31965ef3 DW	295	if (error_tag >= XFS_ERRTAG_MAX)
31965ef3 DW	296	return -EINVAL;
1da177e4	297
31965ef3 DW	298	return xfs_errortag_set(mp, error_tag,
	299	xfs_errortag_random_default[error_tag]);
	300	}
1da177e4	301
31965ef3 DW	302	int
	303	xfs_errortag_clearall(
	304	struct xfs_mount *mp)
	305	{
	306	memset(mp->m_errortag, 0, sizeof(unsigned int) * XFS_ERRTAG_MAX);
1da177e4 LT	307	return 0;
1da177e4 LT	308	}
1550d0b0	309	#endif /* DEBUG */
1da177e4	310
1da177e4 LT	311	void
1da177e4 LT	312	xfs_error_report(
a0e856b0 AE	313	const char *tag,
	314	int level,
	315	struct xfs_mount *mp,
	316	const char *filename,
	317	int linenum,
d9418ed0	318	xfs_failaddr_t failaddr)
1da177e4 LT	319	{
1da177e4 LT	320	if (level <= xfs_error_level) {
6a19d939	321	xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
65dd297a	322	"Internal error %s at line %d of file %s. Caller %pS",
d9418ed0	323	tag, linenum, filename, failaddr);
1da177e4 LT	324
	325	xfs_stack_trace();
	326	}
	327	}
	328
1da177e4 LT	329	void
1da177e4 LT	330	xfs_corruption_error(
a0e856b0 AE	331	const char *tag,
	332	int level,
	333	struct xfs_mount *mp,
	334	void *p,
	335	const char *filename,
	336	int linenum,
d9418ed0	337	xfs_failaddr_t failaddr)
1da177e4 LT	338	{
1da177e4 LT	339	if (level <= xfs_error_level)
9c712a13	340	xfs_hex_dump(p, XFS_CORRUPTION_DUMP_LEN);
d9418ed0	341	xfs_error_report(tag, level, mp, filename, linenum, failaddr);
65333b4c	342	xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
1da177e4	343	}
ca23f8fd ES	344
	345	/*
	346	* Warnings specifically for verifier errors. Differentiate CRC vs. invalid
	347	* values, and omit the stack trace unless the error level is tuned high.
	348	*/
	349	void
	350	xfs_verifier_error(
31ca03c9	351	struct xfs_buf *bp,
bc1a09b8 DW	352	int error,
bc1a09b8 DW	353	xfs_failaddr_t failaddr)
ca23f8fd	354	{
bc1a09b8 DW	355	struct xfs_mount *mp = bp->b_target->bt_mount;
bc1a09b8 DW	356	xfs_failaddr_t fa;
ca23f8fd	357
bc1a09b8 DW	358	fa = failaddr ? failaddr : __return_address;
bc1a09b8 DW	359	__xfs_buf_ioerror(bp, error, fa);
31ca03c9	360
e150dcd4	361	xfs_alert(mp, "Metadata %s detected at %pS, %s block 0x%llx",
2451337d	362	bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
bc1a09b8	363	fa, bp->b_ops->name, bp->b_bn);
ca23f8fd ES	364
	365	xfs_alert(mp, "Unmount and run xfs_repair");
	366
	367	if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
9c712a13 DW	368	xfs_alert(mp, "First %d bytes of corrupted metadata buffer:",
	369	XFS_CORRUPTION_DUMP_LEN);
	370	xfs_hex_dump(xfs_buf_offset(bp, 0), XFS_CORRUPTION_DUMP_LEN);
ca23f8fd ES	371	}
	372
	373	if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
	374	xfs_stack_trace();
	375	}
22431bf3 DW	376
	377	/*
	378	* Warnings for inode corruption problems. Don't bother with the stack
	379	* trace unless the error level is turned up high.
	380	*/
	381	void
	382	xfs_inode_verifier_error(
	383	struct xfs_inode *ip,
	384	int error,
	385	const char *name,
	386	void *buf,
	387	size_t bufsz,
	388	xfs_failaddr_t failaddr)
	389	{
	390	struct xfs_mount *mp = ip->i_mount;
	391	xfs_failaddr_t fa;
	392	int sz;
	393
	394	fa = failaddr ? failaddr : __return_address;
	395
	396	xfs_alert(mp, "Metadata %s detected at %pS, inode 0x%llx %s",
	397	error == -EFSBADCRC ? "CRC error" : "corruption",
	398	fa, ip->i_ino, name);
	399
	400	xfs_alert(mp, "Unmount and run xfs_repair");
	401
	402	if (buf && xfs_error_level >= XFS_ERRLEVEL_LOW) {
	403	sz = min_t(size_t, XFS_CORRUPTION_DUMP_LEN, bufsz);
	404	xfs_alert(mp, "First %d bytes of corrupted metadata buffer:",
	405	sz);
	406	xfs_hex_dump(buf, sz);
	407	}
	408
	409	if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
	410	xfs_stack_trace();
	411	}