svn commit: r213582 - head/bin/rm
Ulrich Spoerlein
uqs at FreeBSD.org
Fri Oct 8 15:20:21 UTC 2010
Author: uqs
Date: Fri Oct 8 15:20:20 2010
New Revision: 213582
URL: http://svn.freebsd.org/changeset/base/213582
Log:
rm(1): clarify that -P works only when blocks are updated in-place
Suggested by: pjd, ivoras, arundel
Modified:
head/bin/rm/rm.1
head/bin/rm/rm.c
Modified: head/bin/rm/rm.1
==============================================================================
--- head/bin/rm/rm.1 Fri Oct 8 15:10:30 2010 (r213581)
+++ head/bin/rm/rm.1 Fri Oct 8 15:20:20 2010 (r213582)
@@ -32,7 +32,7 @@
.\" @(#)rm.1 8.5 (Berkeley) 12/5/94
.\" $FreeBSD$
.\"
-.Dd October 3, 2010
+.Dd October 8, 2010
.Dt RM 1
.Os
.Sh NAME
@@ -229,8 +229,8 @@ command appeared in
.Sh BUGS
The
.Fl P
-option assumes that the underlying file system is a fixed-block file
-system.
-UFS is a fixed-block file system, LFS is not.
+option assumes that the underlying file system updates existing blocks
+in-place and does not store new data in a new location.
+This is true for UFS but not for ZFS, which is using a Copy-On-Write strategy.
In addition, only regular files are overwritten, other types of files
are not.
Modified: head/bin/rm/rm.c
==============================================================================
--- head/bin/rm/rm.c Fri Oct 8 15:10:30 2010 (r213581)
+++ head/bin/rm/rm.c Fri Oct 8 15:20:20 2010 (r213582)
@@ -402,8 +402,8 @@ rm_file(char **argv)
* This is a cheap way to *really* delete files. Note that only regular
* files are deleted, directories (and therefore names) will remain.
* Also, this assumes a fixed-block file system (like FFS, or a V7 or a
- * System V file system). In a logging file system, you'll have to have
- * kernel support.
+ * System V file system). In a logging or COW file system, you'll have to
+ * have kernel support.
*/
int
rm_overwrite(char *file, struct stat *sbp)
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