xnu-2782.1.97.tar.gz

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

diff --git a/bsd/sys/buf_internal.h b/bsd/sys/buf_internal.h
index 6c698d044017ed53f77b5b223d411be037c01658..e0674869f6309be33699b44c3f521dab4a6dbafc 100644 (file)
--- a/bsd/sys/buf_internal.h
+++ b/bsd/sys/buf_internal.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2014 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
@@ -256,13 +256,26 @@ extern vm_offset_t buf_kernel_addrperm;
 #define BA_DELAYIDLESLEEP       0x00000004     /* Process is marked to delay idle sleep on disk IO */
 #define BA_NOCACHE             0x00000008
 #define BA_META                        0x00000010
-#define BA_IO_TIER_MASK                0x00000f00
-#define BA_IO_TIER_SHIFT       8
 #define BA_GREEDY_MODE         0x00000020      /* High speed writes that consume more storage */
 #define BA_QUICK_COMPLETE      0x00000040      /* Request quick completion at expense of storage efficiency */
+#define BA_PASSIVE             0x00000080
+
+/*
+ * Note: IO_TIERs consume 0x0100, 0x0200, 0x0400, 0x0800
+ * These are now in-use by the I/O tiering system.
+ */ 
+#define BA_IO_TIER_MASK                0x00000f00
+#define BA_IO_TIER_SHIFT       8
+
+#define BA_ISOCHRONOUS         0x00001000 /* device specific isochronous throughput to media */
+
 
 #define GET_BUFATTR_IO_TIER(bap)       ((bap->ba_flags & BA_IO_TIER_MASK) >> BA_IO_TIER_SHIFT)
-#define SET_BUFATTR_IO_TIER(bap, tier) (bap->ba_flags |= ((tier << BA_IO_TIER_SHIFT) & BA_IO_TIER_MASK))
+#define SET_BUFATTR_IO_TIER(bap, tier)                                         \
+do {                                                                           \
+       (bap)->ba_flags &= (~BA_IO_TIER_MASK);                                  \
+       (bap)->ba_flags |= (((tier) << BA_IO_TIER_SHIFT) & BA_IO_TIER_MASK);    \
+} while(0)
 
 extern int niobuf_headers;             /* The number of IO buffer headers for cluster IO */
 extern int nbuf_headers;               /* The number of buffer headers */