v4.19.13 snapshot.
diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h
new file mode 100644
index 0000000..246d3e9
--- /dev/null
+++ b/fs/xfs/xfs_error.h
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#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,
+ xfs_failaddr_t failaddr);
+extern void xfs_corruption_error(const char *tag, int level,
+ struct xfs_mount *mp, void *buf, size_t bufsize,
+ const char *filename, int linenum,
+ xfs_failaddr_t failaddr);
+extern void xfs_buf_verifier_error(struct xfs_buf *bp, int error,
+ const char *name, void *buf, size_t bufsz,
+ xfs_failaddr_t failaddr);
+extern void xfs_verifier_error(struct xfs_buf *bp, int error,
+ xfs_failaddr_t failaddr);
+extern void xfs_inode_verifier_error(struct xfs_inode *ip, int error,
+ const char *name, void *buf, size_t bufsz,
+ xfs_failaddr_t failaddr);
+
+#define XFS_ERROR_REPORT(e, lvl, mp) \
+ xfs_error_report(e, lvl, mp, __FILE__, __LINE__, __return_address)
+#define XFS_CORRUPTION_ERROR(e, lvl, mp, buf, bufsize) \
+ xfs_corruption_error(e, lvl, mp, buf, bufsize, \
+ __FILE__, __LINE__, __return_address)
+
+#define XFS_ERRLEVEL_OFF 0
+#define XFS_ERRLEVEL_LOW 1
+#define XFS_ERRLEVEL_HIGH 5
+
+/* Dump 128 bytes of any corrupt buffer */
+#define XFS_CORRUPTION_DUMP_LEN (128)
+
+/*
+ * 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; \
+ } \
+ }
+
+#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__ */