xnu-344.tar.gz

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

diff --git a/bsd/sys/buf.h b/bsd/sys/buf.h
index 924ac0fae64a8b2834f28950f200c211ba957eb9..fb456c5625ae4ff120e8fb2841df78bed9e7194c 100644 (file)
--- a/bsd/sys/buf.h
+++ b/bsd/sys/buf.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
@@ -62,14 +62,18 @@
 
 #ifndef _SYS_BUF_H_
 #define        _SYS_BUF_H_
+
+#include <sys/appleapiopts.h>
+
+#ifdef KERNEL
 #include <sys/queue.h>
 #include <sys/errno.h>
-
 #include <sys/vm.h>
+#include <sys/cdefs.h>
 
-#define NOLIST ((struct buf *)0x87654321)
+#ifdef __APPLE_API_PRIVATE
 
-#include <sys/cdefs.h>
+#define NOLIST ((struct buf *)0x87654321)
 
 /*
  * The buffer header describes an I/O operation in the kernel.
@@ -158,7 +162,7 @@ struct buf {
 #define        B_WANTED        0x00800000      /* Process wants this buffer. */
 #define        B_WRITE         0x00000000      /* Write buffer (pseudo flag). */
 #define        B_WRITEINPROG   0x01000000      /* Write in progress. */
-#define        B_UNUSED0       0x02000000      /* Unused bit */
+#define        B_HDRALLOC      0x02000000      /* zone allocated buffer header */
 #define        B_UNUSED1       0x04000000      /* Unused bit */
 #define B_NEED_IODONE   0x08000000
                                                                /* need to do a biodone on the */
@@ -193,27 +197,35 @@ struct buf {
 #define        BLK_CLREAD      0x20    /* buffer for cluster read */
 #define        BLK_CLWRITE     0x40    /* buffer for cluster write */
 
-#ifdef KERNEL
 extern int nbuf;                       /* The number of buffer headers */
 extern struct buf *buf;                /* The buffer headers. */
 
+#endif /* __APPLE_API_PRIVATE */
+
+
+#ifdef __APPLE_API_UNSTABLE
 /* Macros to clear/set/test flags. */
 #define        SET(t, f)       (t) |= (f)
 #define        CLR(t, f)       (t) &= ~(f)
 #define        ISSET(t, f)     ((t) & (f))
+#endif /* __APPLE_API_UNSTABLE */
 
+#ifdef __APPLE_API_PRIVATE
 /*
  * Definitions for the buffer free lists.
  */
-#define        BQUEUES         5               /* number of free buffer queues */
+#define        BQUEUES         6               /* number of free buffer queues */
 
 #define        BQ_LOCKED       0               /* super-blocks &c */
 #define        BQ_LRU          1               /* lru, useful buffers */
 #define        BQ_AGE          2               /* rubbish */
 #define        BQ_EMPTY        3               /* buffer headers with no memory */
 #define BQ_META                4               /* buffer containing metadata */
+#define BQ_LAUNDRY     5               /* buffers that need cleaning */
+#endif /* __APPLE_API_PRIVATE */
 
 __BEGIN_DECLS
+#ifdef __APPLE_API_UNSTABLE
 int    allocbuf __P((struct buf *, int));
 void   bawrite __P((struct buf *));
 void   bdwrite __P((struct buf *));
@@ -230,6 +242,7 @@ int breadn __P((struct vnode *, daddr_t, int, daddr_t *, int *, int,
 void   brelse __P((struct buf *));
 void   bremfree __P((struct buf *));
 void   bufinit __P((void));
+void   bwillwrite __P((void));
 int    bwrite __P((struct buf *));
 struct buf *getblk __P((struct vnode *, daddr_t, int, int, int, int));
 struct buf *geteblk __P((int));
@@ -239,8 +252,11 @@ int physio __P((void (*)(struct buf *), struct buf *, dev_t, int ,  u_int (*)(st
 int count_busy_buffers __P((void));
 struct buf *alloc_io_buf __P((struct vnode *, int));
 void free_io_buf __P((struct buf *));
+void reassignbuf __P((struct buf *, struct vnode *));
+#endif /* __APPLE_API_UNSTABLE */
 __END_DECLS
 
+#ifdef __APPLE_API_PRIVATE
 /*
  *     Stats on usefulness of the buffer cache
  */
@@ -255,6 +271,7 @@ struct bufstats {
        long    bufs_iobufinuse;        /* number of IO buffers in use */
        long    bufs_iobufsleeps;       /* IO buffer starvation */
 };
+#endif /* __APPLE_API_PRIVATE */
 
 #endif /* KERNEL */
 #endif /* !_SYS_BUF_H_ */