xnu-1228.tar.gz

[apple/xnu.git] / bsd / sys / buf.h

diff --git a/bsd/sys/buf.h b/bsd/sys/buf.h
index 91aa77cf7e01f3629e500b0ce7796b03eb94d48d..5cb9c7f9c60794f186fcf97e3c9b107eb7b2c531 100644 (file)
--- a/bsd/sys/buf.h
+++ b/bsd/sys/buf.h
@@ -1,23 +1,29 @@
 /*
  * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
 /*
@@ -78,6 +84,9 @@
 #define B_CLUSTER      0x00000040      /* UPL based I/O generated by cluster layer */
 #define        B_PAGEIO        0x00000080      /* Page in/out */
 #define        B_META          0x00000100      /* buffer contains meta-data. */
+#define        B_RAW           0x00000200      /* Set by physio for raw transfers. */
+#define        B_FUA           0x00000400      /* Write-through disk cache(if supported) */
+#define B_PASSIVE      0x00000800      /* PASSIVE I/Os are ignored by THROTTLE I/O */
 /*
  * make sure to check when adding flags that
  * that the new flags don't overlap the definitions
@@ -111,6 +120,18 @@ void       buf_markdelayed(buf_t);
  */
 void   buf_markeintr(buf_t);
 
+/*
+ * mark the buffer associated with buf_t
+ * for write through disk cache if device supports
+ */
+void   buf_markfua(buf_t);
+
+/*
+ * returns 1 if the buffer associated with buf_t
+ * is set for write through disk cache... 0 if it does not
+ */
+int    buf_fua(buf_t);
+
 /*
  * returns 1 if the buffer associated with buf_t
  * contains valid data... 0 if it does not
@@ -171,19 +192,19 @@ void      buf_seterror(buf_t, errno_t);
 
 /*
  * set specified flags on buf_t
- * B_LOCKED/B_NOCACHE/B_ASYNC/B_READ/B_WRITE/B_PAGEIO
+ * B_LOCKED/B_NOCACHE/B_ASYNC/B_READ/B_WRITE/B_PAGEIO/B_FUA
  */
 void   buf_setflags(buf_t, int32_t);
 
 /*
  * clear specified flags on buf_t
- * B_LOCKED/B_NOCACHE/B_ASYNC/B_READ/B_WRITE/B_PAGEIO
+ * B_LOCKED/B_NOCACHE/B_ASYNC/B_READ/B_WRITE/B_PAGEIO/B_FUA
  */
 void   buf_clearflags(buf_t, int32_t);
 
 /*
  * return external flags associated with buf_t
- * B_CLUSTER/B_PHYS/B_LOCKED/B_DELWRI/B_ASYNC/B_READ/B_WRITE/B_META/B_PAGEIO
+ * B_CLUSTER/B_PHYS/B_LOCKED/B_DELWRI/B_ASYNC/B_READ/B_WRITE/B_META/B_PAGEIO/B_FUA
  */
 int32_t        buf_flags(buf_t);
 
@@ -391,8 +412,11 @@ int        buf_invalidateblks(vnode_t, int, int, int);
  */
 #define BUF_SKIP_NONLOCKED     0x01
 #define BUF_SKIP_LOCKED                0x02
+#define BUF_SCAN_CLEAN         0x04    /* scan only the clean buffers */
+#define BUF_SCAN_DIRTY         0x08    /* scan only the dirty buffers */
+#define BUF_NOTIFY_BUSY                0x10    /* notify the caller about the busy pages during the scan */
 
-void   buf_flushdirtyblks(vnode_t, int, int, char *);
+void   buf_flushdirtyblks(vnode_t, int, int, const char *);
 void   buf_iterate(vnode_t, int (*)(buf_t, void *), int, void *);
 
 #define        BUF_RETURNED            0