svn commit: r276008 - in head/sys: kern sys

[Konstantin Belousov]

Author: kib
Date: Sun Dec 21 13:32:07 2014
New Revision: 276008
URL: https://svnweb.freebsd.org/changeset/base/276008

Log:
  Add VN_OPEN_NAMECACHE flag for vn_open_cred(9), which requests that
  the created file name was cached.  Use the flag for core dumps.
  
  Requested by:	rpaulo
  Tested by:	pho (previous version)
  Sponsored by:	The FreeBSD Foundation
  MFC after:	2 weeks

Modified:
  head/sys/kern/kern_sig.c
  head/sys/kern/vfs_vnops.c
  head/sys/sys/vnode.h

Modified: head/sys/kern/kern_sig.c
==============================================================================
--- head/sys/kern/kern_sig.c	Sun Dec 21 13:29:33 2014	(r276007)
+++ head/sys/kern/kern_sig.c	Sun Dec 21 13:32:07 2014	(r276008)
@@ -3167,7 +3167,8 @@ corefile_open(const char *comm, uid_t ui
 	sbuf_delete(&sb);
 
 	cmode = S_IRUSR | S_IWUSR;
-	oflags = VN_OPEN_NOAUDIT | (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
+	oflags = VN_OPEN_NOAUDIT | VN_OPEN_NAMECACHE |
+	    (capmode_coredump ? VN_OPEN_NOCAPCHECK : 0);
 
 	/*
 	 * If the core format has a %I in it, then we need to check

Modified: head/sys/kern/vfs_vnops.c
==============================================================================
--- head/sys/kern/vfs_vnops.c	Sun Dec 21 13:29:33 2014	(r276007)
+++ head/sys/kern/vfs_vnops.c	Sun Dec 21 13:32:07 2014	(r276008)
@@ -217,6 +217,8 @@ restart:
 					return (error);
 				goto restart;
 			}
+			if ((vn_open_flags & VN_OPEN_NAMECACHE) != 0)
+				ndp->ni_cnd.cn_flags |= MAKEENTRY;
 #ifdef MAC
 			error = mac_vnode_check_create(cred, ndp->ni_dvp,
 			    &ndp->ni_cnd, vap);

Modified: head/sys/sys/vnode.h
==============================================================================
--- head/sys/sys/vnode.h	Sun Dec 21 13:29:33 2014	(r276007)
+++ head/sys/sys/vnode.h	Sun Dec 21 13:32:07 2014	(r276008)
@@ -580,6 +580,7 @@ typedef void vop_getpages_iodone_t(void 
 /* vn_open_flags */
 #define	VN_OPEN_NOAUDIT		0x00000001
 #define	VN_OPEN_NOCAPCHECK	0x00000002
+#define	VN_OPEN_NAMECACHE	0x00000004
 
 /*
  * Public vnode manipulation functions.