Module Name: src
Committed By: manu
Date: Fri Dec 19 10:59:21 UTC 2014
Modified Files:
src/sys/ufs/ufs: extattr.h
Log Message:
Bump UFS1 extended attribute max name length to 256
For extended attribute name max length, kernel filesystem-independant
code use either EXTATTR_MAXNAMELEN (BSD API) or XATTR_NAME_MAX (Linux API),
which are both defined as KERNEL_NAME_MAX and fits Linux limit of 255
without training \0.
UFS1 code had a lower limit that broke Linux compatibility. We can bump
the limit without sacrifying backward compatibility, because:
1) There is no API exposing this limit outside the kernel. Upper kernel
layers have a larger limit handle the increase without a hitch
2) Each attribute has its own backing store in the fileystem, the name
of the backing store matching the attribute name. A newer kernel can
create/read/write backing store for longer attribute names and will
have no problem with existing shorter names.
To generate a diff of this commit:
cvs rdiff -u -r1.10 -r1.11 src/sys/ufs/ufs/extattr.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/ufs/ufs/extattr.h
diff -u src/sys/ufs/ufs/extattr.h:1.10 src/sys/ufs/ufs/extattr.h:1.11
--- src/sys/ufs/ufs/extattr.h:1.10 Sun Oct 9 21:15:34 2011
+++ src/sys/ufs/ufs/extattr.h Fri Dec 19 10:59:21 2014
@@ -1,4 +1,4 @@
-/* $NetBSD: extattr.h,v 1.10 2011/10/09 21:15:34 chs Exp $ */
+/* $NetBSD: extattr.h,v 1.11 2014/12/19 10:59:21 manu Exp $ */
/*-
* Copyright (c) 1999-2001 Robert N. M. Watson
@@ -43,7 +43,7 @@
#define UFS_EXTATTR_FSROOTSUBDIR ".attribute"
#define UFS_EXTATTR_SUBDIR_SYSTEM "system"
#define UFS_EXTATTR_SUBDIR_USER "user"
-#define UFS_EXTATTR_MAXEXTATTRNAME 65 /* including null */
+#define UFS_EXTATTR_MAXEXTATTRNAME 256 /* including null */
#define UFS_EXTATTR_ATTR_FLAG_INUSE 0x00000001 /* attr has been set */
#define UFS_EXTATTR_PERM_KERNEL 0x00000000
