[linux-block.git] / fs / xfs / xfs_error.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#include "xfs.h"
#include "xfs_shared.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,
	XFS_RANDOM_FORCE_SCRUB_REPAIR,
	XFS_RANDOM_FORCE_SUMMARY_RECALC,
	XFS_RANDOM_IUNLINK_FALLBACK,
	XFS_RANDOM_BUF_IOERROR,
	XFS_RANDOM_REDUCE_MAX_IEXTENTS,
	XFS_RANDOM_BMAP_ALLOC_MINLEN_EXTENT,
	XFS_RANDOM_AG_RESV_FAIL,
};

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);
XFS_ERRORTAG_ATTR_RW(force_repair,	XFS_ERRTAG_FORCE_SCRUB_REPAIR);
XFS_ERRORTAG_ATTR_RW(bad_summary,	XFS_ERRTAG_FORCE_SUMMARY_RECALC);
XFS_ERRORTAG_ATTR_RW(iunlink_fallback,	XFS_ERRTAG_IUNLINK_FALLBACK);
XFS_ERRORTAG_ATTR_RW(buf_ioerror,	XFS_ERRTAG_BUF_IOERROR);
XFS_ERRORTAG_ATTR_RW(reduce_max_iextents,	XFS_ERRTAG_REDUCE_MAX_IEXTENTS);
XFS_ERRORTAG_ATTR_RW(bmap_alloc_minlen_extent,	XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT);
XFS_ERRORTAG_ATTR_RW(ag_resv_fail, XFS_ERRTAG_AG_RESV_FAIL);

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),
	XFS_ERRORTAG_ATTR_LIST(force_repair),
	XFS_ERRORTAG_ATTR_LIST(bad_summary),
	XFS_ERRORTAG_ATTR_LIST(iunlink_fallback),
	XFS_ERRORTAG_ATTR_LIST(buf_ioerror),
	XFS_ERRORTAG_ATTR_LIST(reduce_max_iextents),
	XFS_ERRORTAG_ATTR_LIST(bmap_alloc_minlen_extent),
	XFS_ERRORTAG_ATTR_LIST(ag_resv_fail),
	NULL,
};
ATTRIBUTE_GROUPS(xfs_errortag);

static struct kobj_type xfs_errortag_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_errortag_sysfs_ops,
	.default_groups = xfs_errortag_groups,
};

int
xfs_errortag_init(
	struct xfs_mount	*mp)
{
	mp->m_errortag = kmem_zalloc(sizeof(unsigned int) * XFS_ERRTAG_MAX,
			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_super->s_id);
	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)
{
	BUILD_BUG_ON(ARRAY_SIZE(xfs_errortag_random_default) != XFS_ERRTAG_MAX);

	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,
	const void		*buf,
	size_t			bufsize,
	const char		*filename,
	int			linenum,
	xfs_failaddr_t		failaddr)
{
	if (buf && level <= xfs_error_level)
		xfs_hex_dump(buf, bufsize);
	xfs_error_report(tag, level, mp, filename, linenum, failaddr);
	xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
}

/*
 * Complain about the kinds of metadata corruption that we can't detect from a
 * verifier, such as incorrect inter-block relationship data.  Does not set
 * bp->b_error.
 *
 * Call xfs_buf_mark_corrupt, not this function.
 */
void
xfs_buf_corruption_error(
	struct xfs_buf		*bp,
	xfs_failaddr_t		fa)
{
	struct xfs_mount	*mp = bp->b_mount;

	xfs_alert_tag(mp, XFS_PTAG_VERIFIER_ERROR,
		  "Metadata corruption detected at %pS, %s block 0x%llx",
		  fa, bp->b_ops->name, xfs_buf_daddr(bp));

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

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

/*
 * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
 * values, and omit the stack trace unless the error level is tuned high.
 */
void
xfs_buf_verifier_error(
	struct xfs_buf		*bp,
	int			error,
	const char		*name,
	const void		*buf,
	size_t			bufsz,
	xfs_failaddr_t		failaddr)
{
	struct xfs_mount	*mp = bp->b_mount;
	xfs_failaddr_t		fa;
	int			sz;

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

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

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

	if (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();
}

/*
 * 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)
{
	return xfs_buf_verifier_error(bp, error, "", xfs_buf_offset(bp, 0),
			XFS_CORRUPTION_DUMP_LEN, failaddr);
}

/*
 * 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,
	const 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
0b61f8a4	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
7b718769 NS	3	* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
7b718769 NS	4	* All Rights Reserved.
1da177e4	5	*/
1da177e4	6	#include "xfs.h"
5467b34b	7	#include "xfs_shared.h"
a4fbe6ab	8	#include "xfs_format.h"
a844f451	9	#include "xfs_fs.h"
239880ef DC	10	#include "xfs_log_format.h"
239880ef DC	11	#include "xfs_trans_resv.h"
1da177e4	12	#include "xfs_mount.h"
e9e899a2	13	#include "xfs_errortag.h"
1da177e4	14	#include "xfs_error.h"
c6840101	15	#include "xfs_sysfs.h"
22431bf3	16	#include "xfs_inode.h"
1da177e4 LT	17
	18	#ifdef DEBUG
	19
31965ef3 DW	20	static unsigned int xfs_errortag_random_default[] = {
	21	XFS_RANDOM_DEFAULT,
	22	XFS_RANDOM_IFLUSH_1,
	23	XFS_RANDOM_IFLUSH_2,
	24	XFS_RANDOM_IFLUSH_3,
	25	XFS_RANDOM_IFLUSH_4,
	26	XFS_RANDOM_IFLUSH_5,
	27	XFS_RANDOM_IFLUSH_6,
	28	XFS_RANDOM_DA_READ_BUF,
	29	XFS_RANDOM_BTREE_CHECK_LBLOCK,
	30	XFS_RANDOM_BTREE_CHECK_SBLOCK,
	31	XFS_RANDOM_ALLOC_READ_AGF,
	32	XFS_RANDOM_IALLOC_READ_AGI,
	33	XFS_RANDOM_ITOBP_INOTOBP,
	34	XFS_RANDOM_IUNLINK,
	35	XFS_RANDOM_IUNLINK_REMOVE,
	36	XFS_RANDOM_DIR_INO_VALIDATE,
	37	XFS_RANDOM_BULKSTAT_READ_CHUNK,
	38	XFS_RANDOM_IODONE_IOERR,
	39	XFS_RANDOM_STRATREAD_IOERR,
	40	XFS_RANDOM_STRATCMPL_IOERR,
	41	XFS_RANDOM_DIOWRITE_IOERR,
	42	XFS_RANDOM_BMAPIFORMAT,
	43	XFS_RANDOM_FREE_EXTENT,
	44	XFS_RANDOM_RMAP_FINISH_ONE,
	45	XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE,
	46	XFS_RANDOM_REFCOUNT_FINISH_ONE,
	47	XFS_RANDOM_BMAP_FINISH_ONE,
	48	XFS_RANDOM_AG_RESV_CRITICAL,
f8c47250	49	XFS_RANDOM_DROP_WRITES,
3e88a007	50	XFS_RANDOM_LOG_BAD_CRC,
7f4d01f3	51	XFS_RANDOM_LOG_ITEM_PIN,
7561d27e	52	XFS_RANDOM_BUF_LRU_REF,
84d42ea6	53	XFS_RANDOM_FORCE_SCRUB_REPAIR,
f467cad9	54	XFS_RANDOM_FORCE_SUMMARY_RECALC,
9b247179	55	XFS_RANDOM_IUNLINK_FALLBACK,
7376d745	56	XFS_RANDOM_BUF_IOERROR,
f9fa8716	57	XFS_RANDOM_REDUCE_MAX_IEXTENTS,
30151967	58	XFS_RANDOM_BMAP_ALLOC_MINLEN_EXTENT,
2b92faed	59	XFS_RANDOM_AG_RESV_FAIL,
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);
7f4d01f3	164	XFS_ERRORTAG_ATTR_RW(log_item_pin, XFS_ERRTAG_LOG_ITEM_PIN);
7561d27e	165	XFS_ERRORTAG_ATTR_RW(buf_lru_ref, XFS_ERRTAG_BUF_LRU_REF);
84d42ea6	166	XFS_ERRORTAG_ATTR_RW(force_repair, XFS_ERRTAG_FORCE_SCRUB_REPAIR);
f467cad9	167	XFS_ERRORTAG_ATTR_RW(bad_summary, XFS_ERRTAG_FORCE_SUMMARY_RECALC);
9b247179	168	XFS_ERRORTAG_ATTR_RW(iunlink_fallback, XFS_ERRTAG_IUNLINK_FALLBACK);
7376d745	169	XFS_ERRORTAG_ATTR_RW(buf_ioerror, XFS_ERRTAG_BUF_IOERROR);
f9fa8716	170	XFS_ERRORTAG_ATTR_RW(reduce_max_iextents, XFS_ERRTAG_REDUCE_MAX_IEXTENTS);
30151967	171	XFS_ERRORTAG_ATTR_RW(bmap_alloc_minlen_extent, XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT);
2b92faed	172	XFS_ERRORTAG_ATTR_RW(ag_resv_fail, XFS_ERRTAG_AG_RESV_FAIL);
c6840101 DW	173
	174	static struct attribute *xfs_errortag_attrs[] = {
	175	XFS_ERRORTAG_ATTR_LIST(noerror),
	176	XFS_ERRORTAG_ATTR_LIST(iflush1),
	177	XFS_ERRORTAG_ATTR_LIST(iflush2),
	178	XFS_ERRORTAG_ATTR_LIST(iflush3),
	179	XFS_ERRORTAG_ATTR_LIST(iflush4),
	180	XFS_ERRORTAG_ATTR_LIST(iflush5),
	181	XFS_ERRORTAG_ATTR_LIST(iflush6),
	182	XFS_ERRORTAG_ATTR_LIST(dareadbuf),
	183	XFS_ERRORTAG_ATTR_LIST(btree_chk_lblk),
	184	XFS_ERRORTAG_ATTR_LIST(btree_chk_sblk),
	185	XFS_ERRORTAG_ATTR_LIST(readagf),
	186	XFS_ERRORTAG_ATTR_LIST(readagi),
	187	XFS_ERRORTAG_ATTR_LIST(itobp),
	188	XFS_ERRORTAG_ATTR_LIST(iunlink),
	189	XFS_ERRORTAG_ATTR_LIST(iunlinkrm),
	190	XFS_ERRORTAG_ATTR_LIST(dirinovalid),
	191	XFS_ERRORTAG_ATTR_LIST(bulkstat),
	192	XFS_ERRORTAG_ATTR_LIST(logiodone),
	193	XFS_ERRORTAG_ATTR_LIST(stratread),
	194	XFS_ERRORTAG_ATTR_LIST(stratcmpl),
	195	XFS_ERRORTAG_ATTR_LIST(diowrite),
	196	XFS_ERRORTAG_ATTR_LIST(bmapifmt),
	197	XFS_ERRORTAG_ATTR_LIST(free_extent),
	198	XFS_ERRORTAG_ATTR_LIST(rmap_finish_one),
	199	XFS_ERRORTAG_ATTR_LIST(refcount_continue_update),
	200	XFS_ERRORTAG_ATTR_LIST(refcount_finish_one),
	201	XFS_ERRORTAG_ATTR_LIST(bmap_finish_one),
	202	XFS_ERRORTAG_ATTR_LIST(ag_resv_critical),
f8c47250	203	XFS_ERRORTAG_ATTR_LIST(drop_writes),
3e88a007	204	XFS_ERRORTAG_ATTR_LIST(log_bad_crc),
7f4d01f3	205	XFS_ERRORTAG_ATTR_LIST(log_item_pin),
7561d27e	206	XFS_ERRORTAG_ATTR_LIST(buf_lru_ref),
84d42ea6	207	XFS_ERRORTAG_ATTR_LIST(force_repair),
f467cad9	208	XFS_ERRORTAG_ATTR_LIST(bad_summary),
9b247179	209	XFS_ERRORTAG_ATTR_LIST(iunlink_fallback),
7376d745	210	XFS_ERRORTAG_ATTR_LIST(buf_ioerror),
f9fa8716	211	XFS_ERRORTAG_ATTR_LIST(reduce_max_iextents),
30151967	212	XFS_ERRORTAG_ATTR_LIST(bmap_alloc_minlen_extent),
2b92faed	213	XFS_ERRORTAG_ATTR_LIST(ag_resv_fail),
c6840101 DW	214	NULL,
c6840101 DW	215	};
219aac5d	216	ATTRIBUTE_GROUPS(xfs_errortag);
c6840101	217
4371155e	218	static struct kobj_type xfs_errortag_ktype = {
c6840101 DW	219	.release = xfs_sysfs_release,
c6840101 DW	220	.sysfs_ops = &xfs_errortag_sysfs_ops,
219aac5d	221	.default_groups = xfs_errortag_groups,
c6840101 DW	222	};
c6840101 DW	223
1da177e4	224	int
31965ef3 DW	225	xfs_errortag_init(
31965ef3 DW	226	struct xfs_mount *mp)
1da177e4	227	{
31965ef3	228	mp->m_errortag = kmem_zalloc(sizeof(unsigned int) * XFS_ERRTAG_MAX,
707e0dda	229	KM_MAYFAIL);
31965ef3 DW	230	if (!mp->m_errortag)
31965ef3 DW	231	return -ENOMEM;
c6840101 DW	232
	233	return xfs_sysfs_init(&mp->m_errortag_kobj, &xfs_errortag_ktype,
	234	&mp->m_kobj, "errortag");
31965ef3	235	}
1da177e4	236
31965ef3 DW	237	void
	238	xfs_errortag_del(
	239	struct xfs_mount *mp)
	240	{
c6840101	241	xfs_sysfs_del(&mp->m_errortag_kobj);
31965ef3 DW	242	kmem_free(mp->m_errortag);
31965ef3 DW	243	}
1da177e4	244
31965ef3 DW	245	bool
	246	xfs_errortag_test(
	247	struct xfs_mount *mp,
	248	const char *expression,
	249	const char *file,
	250	int line,
	251	unsigned int error_tag)
	252	{
	253	unsigned int randfactor;
1da177e4	254
d04c241c CM	255	/*
	256	* To be able to use error injection anywhere, we need to ensure error
	257	* injection mechanism is already initialized.
	258	*
	259	* Code paths like I/O completion can be called before the
	260	* initialization is complete, but be able to inject errors in such
	261	* places is still useful.
	262	*/
	263	if (!mp->m_errortag)
	264	return false;
	265
31965ef3 DW	266	ASSERT(error_tag < XFS_ERRTAG_MAX);
	267	randfactor = mp->m_errortag[error_tag];
	268	if (!randfactor \|\| prandom_u32() % randfactor)
	269	return false;
1da177e4	270
31965ef3 DW	271	xfs_warn_ratelimited(mp,
31965ef3 DW	272	"Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
e1d3d218	273	expression, file, line, mp->m_super->s_id);
31965ef3	274	return true;
1da177e4 LT	275	}
1da177e4 LT	276
c6840101 DW	277	int
	278	xfs_errortag_get(
	279	struct xfs_mount *mp,
	280	unsigned int error_tag)
	281	{
	282	if (error_tag >= XFS_ERRTAG_MAX)
	283	return -EINVAL;
	284
	285	return mp->m_errortag[error_tag];
	286	}
	287
1da177e4	288	int
31965ef3 DW	289	xfs_errortag_set(
	290	struct xfs_mount *mp,
	291	unsigned int error_tag,
	292	unsigned int tag_value)
1da177e4	293	{
128f24d5 DW	294	if (error_tag >= XFS_ERRTAG_MAX)
	295	return -EINVAL;
	296
31965ef3 DW	297	mp->m_errortag[error_tag] = tag_value;
31965ef3 DW	298	return 0;
1da177e4 LT	299	}
1da177e4 LT	300
1da177e4	301	int
31965ef3 DW	302	xfs_errortag_add(
	303	struct xfs_mount *mp,
	304	unsigned int error_tag)
1da177e4	305	{
b2c2974b GX	306	BUILD_BUG_ON(ARRAY_SIZE(xfs_errortag_random_default) != XFS_ERRTAG_MAX);
b2c2974b GX	307
31965ef3 DW	308	if (error_tag >= XFS_ERRTAG_MAX)
31965ef3 DW	309	return -EINVAL;
1da177e4	310
31965ef3 DW	311	return xfs_errortag_set(mp, error_tag,
	312	xfs_errortag_random_default[error_tag]);
	313	}
1da177e4	314
31965ef3 DW	315	int
	316	xfs_errortag_clearall(
	317	struct xfs_mount *mp)
	318	{
	319	memset(mp->m_errortag, 0, sizeof(unsigned int) * XFS_ERRTAG_MAX);
1da177e4 LT	320	return 0;
1da177e4 LT	321	}
1550d0b0	322	#endif /* DEBUG */
1da177e4	323
1da177e4 LT	324	void
1da177e4 LT	325	xfs_error_report(
a0e856b0 AE	326	const char *tag,
	327	int level,
	328	struct xfs_mount *mp,
	329	const char *filename,
	330	int linenum,
d9418ed0	331	xfs_failaddr_t failaddr)
1da177e4 LT	332	{
1da177e4 LT	333	if (level <= xfs_error_level) {
6a19d939	334	xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
65dd297a	335	"Internal error %s at line %d of file %s. Caller %pS",
d9418ed0	336	tag, linenum, filename, failaddr);
1da177e4 LT	337
	338	xfs_stack_trace();
	339	}
	340	}
	341
1da177e4 LT	342	void
1da177e4 LT	343	xfs_corruption_error(
a0e856b0 AE	344	const char *tag,
	345	int level,
	346	struct xfs_mount *mp,
d243b89a	347	const void *buf,
2551a530	348	size_t bufsize,
a0e856b0 AE	349	const char *filename,
a0e856b0 AE	350	int linenum,
d9418ed0	351	xfs_failaddr_t failaddr)
1da177e4	352	{
6519f708	353	if (buf && level <= xfs_error_level)
2551a530	354	xfs_hex_dump(buf, bufsize);
d9418ed0	355	xfs_error_report(tag, level, mp, filename, linenum, failaddr);
65333b4c	356	xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
1da177e4	357	}
ca23f8fd	358
a5155b87 DW	359	/*
	360	* Complain about the kinds of metadata corruption that we can't detect from a
	361	* verifier, such as incorrect inter-block relationship data. Does not set
	362	* bp->b_error.
8d57c216 DW	363	*
8d57c216 DW	364	* Call xfs_buf_mark_corrupt, not this function.
a5155b87 DW	365	*/
	366	void
	367	xfs_buf_corruption_error(
e83cf875 DW	368	struct xfs_buf *bp,
e83cf875 DW	369	xfs_failaddr_t fa)
a5155b87 DW	370	{
	371	struct xfs_mount *mp = bp->b_mount;
	372
	373	xfs_alert_tag(mp, XFS_PTAG_VERIFIER_ERROR,
	374	"Metadata corruption detected at %pS, %s block 0x%llx",
9343ee76	375	fa, bp->b_ops->name, xfs_buf_daddr(bp));
a5155b87 DW	376
	377	xfs_alert(mp, "Unmount and run xfs_repair");
	378
	379	if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
	380	xfs_stack_trace();
	381	}
	382
ca23f8fd ES	383	/*
	384	* Warnings specifically for verifier errors. Differentiate CRC vs. invalid
	385	* values, and omit the stack trace unless the error level is tuned high.
	386	*/
	387	void
6edb1810	388	xfs_buf_verifier_error(
31ca03c9	389	struct xfs_buf *bp,
bc1a09b8	390	int error,
6edb1810	391	const char *name,
d243b89a	392	const void *buf,
6edb1810	393	size_t bufsz,
bc1a09b8	394	xfs_failaddr_t failaddr)
ca23f8fd	395	{
dbd329f1	396	struct xfs_mount *mp = bp->b_mount;
bc1a09b8	397	xfs_failaddr_t fa;
6edb1810	398	int sz;
ca23f8fd	399
bc1a09b8 DW	400	fa = failaddr ? failaddr : __return_address;
bc1a09b8 DW	401	__xfs_buf_ioerror(bp, error, fa);
31ca03c9	402
d519da41 MB	403	xfs_alert_tag(mp, XFS_PTAG_VERIFIER_ERROR,
d519da41 MB	404	"Metadata %s detected at %pS, %s block 0x%llx %s",
2451337d	405	bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
9343ee76	406	fa, bp->b_ops->name, xfs_buf_daddr(bp), name);
ca23f8fd ES	407
	408	xfs_alert(mp, "Unmount and run xfs_repair");
	409
	410	if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
6edb1810	411	sz = min_t(size_t, XFS_CORRUPTION_DUMP_LEN, bufsz);
9c712a13	412	xfs_alert(mp, "First %d bytes of corrupted metadata buffer:",
6edb1810 DW	413	sz);
6edb1810 DW	414	xfs_hex_dump(buf, sz);
ca23f8fd ES	415	}
	416
	417	if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
	418	xfs_stack_trace();
	419	}
22431bf3	420
6edb1810 DW	421	/*
	422	* Warnings specifically for verifier errors. Differentiate CRC vs. invalid
	423	* values, and omit the stack trace unless the error level is tuned high.
	424	*/
	425	void
	426	xfs_verifier_error(
	427	struct xfs_buf *bp,
	428	int error,
	429	xfs_failaddr_t failaddr)
	430	{
	431	return xfs_buf_verifier_error(bp, error, "", xfs_buf_offset(bp, 0),
	432	XFS_CORRUPTION_DUMP_LEN, failaddr);
	433	}
	434
22431bf3 DW	435	/*
	436	* Warnings for inode corruption problems. Don't bother with the stack
	437	* trace unless the error level is turned up high.
	438	*/
	439	void
	440	xfs_inode_verifier_error(
	441	struct xfs_inode *ip,
	442	int error,
	443	const char *name,
d243b89a	444	const void *buf,
22431bf3 DW	445	size_t bufsz,
	446	xfs_failaddr_t failaddr)
	447	{
	448	struct xfs_mount *mp = ip->i_mount;
	449	xfs_failaddr_t fa;
	450	int sz;
	451
	452	fa = failaddr ? failaddr : __return_address;
	453
	454	xfs_alert(mp, "Metadata %s detected at %pS, inode 0x%llx %s",
	455	error == -EFSBADCRC ? "CRC error" : "corruption",
	456	fa, ip->i_ino, name);
	457
	458	xfs_alert(mp, "Unmount and run xfs_repair");
	459
	460	if (buf && xfs_error_level >= XFS_ERRLEVEL_LOW) {
	461	sz = min_t(size_t, XFS_CORRUPTION_DUMP_LEN, bufsz);
	462	xfs_alert(mp, "First %d bytes of corrupted metadata buffer:",
	463	sz);
	464	xfs_hex_dump(buf, sz);
	465	}
	466
	467	if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
	468	xfs_stack_trace();
	469	}