Module Name: src
Committed By: riastradh
Date: Fri Mar 20 15:41:44 UTC 2015
Modified Files:
src/sys/uvm: uvm_extern.h
Log Message:
Comments explaining UBC_* flags.
To generate a diff of this commit:
cvs rdiff -u -r1.193 -r1.194 src/sys/uvm/uvm_extern.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/uvm/uvm_extern.h
diff -u src/sys/uvm/uvm_extern.h:1.193 src/sys/uvm/uvm_extern.h:1.194
--- src/sys/uvm/uvm_extern.h:1.193 Fri Feb 6 18:19:22 2015
+++ src/sys/uvm/uvm_extern.h Fri Mar 20 15:41:43 2015
@@ -1,4 +1,4 @@
-/* $NetBSD: uvm_extern.h,v 1.193 2015/02/06 18:19:22 maxv Exp $ */
+/* $NetBSD: uvm_extern.h,v 1.194 2015/03/20 15:41:43 riastradh Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -175,19 +175,23 @@
/*
* flags for ubc_alloc()
*/
-#define UBC_READ 0x001
-#define UBC_WRITE 0x002
-#define UBC_FAULTBUSY 0x004
+#define UBC_READ 0x001 /* reading from object */
+#define UBC_WRITE 0x002 /* writing to object */
+#define UBC_FAULTBUSY 0x004 /* nobody else is using these pages, so busy
+ * them at alloc and unbusy at release (e.g.,
+ * for writes extending a file) */
/*
* flags for ubc_release()
*/
-#define UBC_UNMAP 0x010
+#define UBC_UNMAP 0x010 /* unmap pages now -- don't leave the
+ * mappings cached indefinitely */
/*
- * flags for ubc_uiomve()
+ * flags for ubc_uiomove()
*/
-#define UBC_PARTIALOK 0x100
+#define UBC_PARTIALOK 0x100 /* return early on error; otherwise, zero all
+ * remaining bytes after error */
/*
* flags for uvn_findpages().
