diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
new file mode 100644
index 0000000..bbe1dea
--- /dev/null
+++ b/fs/xfs/xfs_error.c
@@ -0,0 +1,327 @@
+/*
+ * Copyright (c) 2000-2001 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 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.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+#include "xfs.h"
+
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_sb.h"
+#include "xfs_trans.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_utils.h"
+#include "xfs_error.h"
+
+#ifdef DEBUG
+
+int	xfs_etrap[XFS_ERROR_NTRAP] = {
+	0,
+};
+
+int
+xfs_error_trap(int e)
+{
+	int i;
+
+	if (!e)
+		return 0;
+	for (i = 0; i < XFS_ERROR_NTRAP; i++) {
+		if (xfs_etrap[i] == 0)
+			break;
+		if (e != xfs_etrap[i])
+			continue;
+		cmn_err(CE_NOTE, "xfs_error_trap: error %d", e);
+		debug_stop_all_cpus((void *)-1LL);
+		BUG();
+		break;
+	}
+	return e;
+}
+#endif
+
+#if (defined(DEBUG) || defined(INDUCE_IO_ERROR))
+
+int	xfs_etest[XFS_NUM_INJECT_ERROR];
+int64_t	xfs_etest_fsid[XFS_NUM_INJECT_ERROR];
+char *	xfs_etest_fsname[XFS_NUM_INJECT_ERROR];
+
+void
+xfs_error_test_init(void)
+{
+	memset(xfs_etest, 0, sizeof(xfs_etest));
+	memset(xfs_etest_fsid, 0, sizeof(xfs_etest_fsid));
+	memset(xfs_etest_fsname, 0, sizeof(xfs_etest_fsname));
+}
+
+int
+xfs_error_test(int error_tag, int *fsidp, char *expression,
+	       int line, char *file, unsigned long randfactor)
+{
+	int i;
+	int64_t fsid;
+
+	if (random() % randfactor)
+		return 0;
+
+	memcpy(&fsid, fsidp, sizeof(xfs_fsid_t));
+
+	for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
+		if (xfs_etest[i] == error_tag && xfs_etest_fsid[i] == fsid) {
+			cmn_err(CE_WARN,
+	"Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
+				expression, file, line, xfs_etest_fsname[i]);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+int
+xfs_errortag_add(int error_tag, xfs_mount_t *mp)
+{
+	int i;
+	int len;
+	int64_t fsid;
+
+	memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
+
+	for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
+		if (xfs_etest_fsid[i] == fsid && xfs_etest[i] == error_tag) {
+			cmn_err(CE_WARN, "XFS error tag #%d on", error_tag);
+			return 0;
+		}
+	}
+
+	for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
+		if (xfs_etest[i] == 0) {
+			cmn_err(CE_WARN, "Turned on XFS error tag #%d",
+				error_tag);
+			xfs_etest[i] = error_tag;
+			xfs_etest_fsid[i] = fsid;
+			len = strlen(mp->m_fsname);
+			xfs_etest_fsname[i] = kmem_alloc(len + 1, KM_SLEEP);
+			strcpy(xfs_etest_fsname[i], mp->m_fsname);
+			return 0;
+		}
+	}
+
+	cmn_err(CE_WARN, "error tag overflow, too many turned on");
+
+	return 1;
+}
+
+int
+xfs_errortag_clear(int error_tag, xfs_mount_t *mp)
+{
+	int i;
+	int64_t fsid;
+
+	memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
+
+	for (i = 0; i < XFS_NUM_INJECT_ERROR; i++) {
+		if (xfs_etest_fsid[i] == fsid && xfs_etest[i] == error_tag) {
+			xfs_etest[i] = 0;
+			xfs_etest_fsid[i] = 0LL;
+			kmem_free(xfs_etest_fsname[i],
+				  strlen(xfs_etest_fsname[i]) + 1);
+			xfs_etest_fsname[i] = NULL;
+			cmn_err(CE_WARN, "Cleared XFS error tag #%d",
+				error_tag);
+			return 0;
+		}
+	}
+
+	cmn_err(CE_WARN, "XFS error tag %d not on", error_tag);
+
+	return 1;
+}
+
+int
+xfs_errortag_clearall_umount(int64_t fsid, char *fsname, int loud)
+{
+	int i;
+	int cleared = 0;
+
+	for (i = 0; i < XFS_NUM_INJECT_ERROR; i++) {
+		if ((fsid == 0LL || xfs_etest_fsid[i] == fsid) &&
+		     xfs_etest[i] != 0) {
+			cleared = 1;
+			cmn_err(CE_WARN, "Clearing XFS error tag #%d",
+				xfs_etest[i]);
+			xfs_etest[i] = 0;
+			xfs_etest_fsid[i] = 0LL;
+			kmem_free(xfs_etest_fsname[i],
+				  strlen(xfs_etest_fsname[i]) + 1);
+			xfs_etest_fsname[i] = NULL;
+		}
+	}
+
+	if (loud || cleared)
+		cmn_err(CE_WARN,
+			"Cleared all XFS error tags for filesystem \"%s\"",
+			fsname);
+
+	return 0;
+}
+
+int
+xfs_errortag_clearall(xfs_mount_t *mp)
+{
+	int64_t fsid;
+
+	memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
+
+	return xfs_errortag_clearall_umount(fsid, mp->m_fsname, 1);
+}
+#endif /* DEBUG || INDUCE_IO_ERROR */
+
+static void
+xfs_fs_vcmn_err(int level, xfs_mount_t *mp, char *fmt, va_list ap)
+{
+	if (mp != NULL) {
+		char	*newfmt;
+		int	len = 16 + mp->m_fsname_len + strlen(fmt);
+
+		newfmt = kmem_alloc(len, KM_SLEEP);
+		sprintf(newfmt, "Filesystem \"%s\": %s", mp->m_fsname, fmt);
+		icmn_err(level, newfmt, ap);
+		kmem_free(newfmt, len);
+	} else {
+		icmn_err(level, fmt, ap);
+	}
+}
+
+void
+xfs_fs_cmn_err(int level, xfs_mount_t *mp, char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	xfs_fs_vcmn_err(level, mp, fmt, ap);
+	va_end(ap);
+}
+
+void
+xfs_cmn_err(int panic_tag, int level, xfs_mount_t *mp, char *fmt, ...)
+{
+	va_list ap;
+
+#ifdef DEBUG
+	xfs_panic_mask |= XFS_PTAG_SHUTDOWN_CORRUPT;
+#endif
+
+	if (xfs_panic_mask && (xfs_panic_mask & panic_tag)
+	    && (level & CE_ALERT)) {
+		level &= ~CE_ALERT;
+		level |= CE_PANIC;
+		cmn_err(CE_ALERT, "XFS: Transforming an alert into a BUG.");
+	}
+	va_start(ap, fmt);
+	xfs_fs_vcmn_err(level, mp, fmt, ap);
+	va_end(ap);
+}
+
+void
+xfs_error_report(
+	char		*tag,
+	int		level,
+	xfs_mount_t	*mp,
+	char		*fname,
+	int		linenum,
+	inst_t		*ra)
+{
+	if (level <= xfs_error_level) {
+		xfs_cmn_err(XFS_PTAG_ERROR_REPORT,
+			    CE_ALERT, mp,
+		"XFS internal error %s at line %d of file %s.  Caller 0x%p\n",
+			    tag, linenum, fname, ra);
+
+		xfs_stack_trace();
+	}
+}
+
+void
+xfs_hex_dump(void *p, int length)
+{
+	__uint8_t *uip = (__uint8_t*)p;
+	int	i;
+	char	sbuf[128], *s;
+
+	s = sbuf;
+	*s = '\0';
+	for (i=0; i<length; i++, uip++) {
+		if ((i % 16) == 0) {
+			if (*s != '\0')
+				cmn_err(CE_ALERT, "%s\n", sbuf);
+			s = sbuf;
+			sprintf(s, "0x%x: ", i);
+			while( *s != '\0')
+				s++;
+		}
+		sprintf(s, "%02x ", *uip);
+
+		/*
+		 * the kernel sprintf is a void; user sprintf returns
+		 * the sprintf'ed string's length.  Find the new end-
+		 * of-string
+		 */
+		while( *s != '\0')
+			s++;
+	}
+	cmn_err(CE_ALERT, "%s\n", sbuf);
+}
+
+void
+xfs_corruption_error(
+	char		*tag,
+	int		level,
+	xfs_mount_t	*mp,
+	void		*p,
+	char		*fname,
+	int		linenum,
+	inst_t		*ra)
+{
+	if (level <= xfs_error_level)
+		xfs_hex_dump(p, 16);
+	xfs_error_report(tag, level, mp, fname, linenum, ra);
+}