svn commit: r213543 - head/sys/fs/msdosfs

[Konstantin Belousov]

Author: kib
Date: Fri Oct  8 07:17:22 2010
New Revision: 213543
URL: http://svn.freebsd.org/changeset/base/213543

Log:
  Add a comment describing the reason for calling cache_purge(fvp).
  
  Requested by:	danfe
  MFC after:	6 days

Modified:
  head/sys/fs/msdosfs/msdosfs_vnops.c

Modified: head/sys/fs/msdosfs/msdosfs_vnops.c
==============================================================================
--- head/sys/fs/msdosfs/msdosfs_vnops.c	Fri Oct  8 01:54:27 2010	(r213542)
+++ head/sys/fs/msdosfs/msdosfs_vnops.c	Fri Oct  8 07:17:22 2010	(r213543)
@@ -1258,6 +1258,13 @@ abortit:
 		}
 	}
 
+	/*
+	 * The msdosfs lookup is case insensitive. Several aliases may
+	 * be inserted for a single directory entry. As a consequnce,
+	 * name cache purge done by lookup for fvp when DELETE op for
+	 * namei is specified, might be not enough to expunge all
+	 * namecache entries that were installed for this direntry.
+	 */
 	cache_purge(fvp);
 	VOP_UNLOCK(fvp, 0);
 bad: