xnu-1228.7.58.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 2afe6eb2c5ddfdca8f3f25c2e890119f2cb1a8f2..bbe22779d5641fff716fc230eb406770d436130f 100644 (file)
--- a/bsd/sys/buf_internal.h
+++ b/bsd/sys/buf_internal.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
@@ -80,7 +80,6 @@
 #include <sys/lock.h>
 
 
-extern lck_mtx_t    *buf_mtxp;
 #define NOLIST ((struct buf *)0x87654321)
 
 /*
@@ -103,9 +102,9 @@ struct buf {
        daddr64_t       b_lblkno;       /* Logical block number. */
        daddr64_t       b_blkno;        /* Underlying physical block number. */
        void    (*b_iodone)(buf_t, void *);     /* Function to call upon completion. */
-       vnode_t b_vp;                   /* Device vnode. */
-       struct  ucred *b_rcred;         /* Read credentials reference. */
-       struct  ucred *b_wcred;         /* Write credentials reference. */
+       vnode_t b_vp;                   /* File vnode for data, device vnode for metadata. */
+       kauth_cred_t b_rcred;           /* Read credentials reference. */
+       kauth_cred_t b_wcred;           /* Write credentials reference. */
        void *  b_upl;                  /* Pointer to UPL */
        buf_t   b_real_bp;              /* used to track bp generated through cluster_bp */
        TAILQ_ENTRY(buf)        b_act;  /* Device driver queue when active */
@@ -132,6 +131,7 @@ struct buf {
 #define b_trans_head b_freelist.tqe_prev
 #define b_trans_next b_freelist.tqe_next
 #define b_iostate    b_rcred
+#define b_cliodone   b_wcred
 
 /*
  * These flags are kept in b_lflags... 
@@ -140,17 +140,18 @@ struct buf {
 #define        BL_BUSY         0x00000001      /* I/O in progress. */
 #define        BL_WANTED       0x00000002      /* Process wants this buffer. */
 #define BL_IOBUF       0x00000004      /* buffer allocated via 'buf_alloc' */
-
+#define BL_CALLDONE    0x00000008      /* callback routine on B_CALL bp has completed */
 
 /*
  * mask used by buf_flags... these are the readable external flags
  */
-#define BUF_X_RDFLAGS (B_CLUSTER | B_PHYS | B_LOCKED | B_DELWRI | B_ASYNC |\
-                       B_READ | B_WRITE | B_META | B_PAGEIO)
+#define BUF_X_RDFLAGS (B_PHYS | B_RAW | B_LOCKED | B_ASYNC | B_READ | B_WRITE | B_PAGEIO |\
+                      B_META | B_CLUSTER | B_DELWRI | B_FUA | B_PASSIVE)
 /*
  * mask used by buf_clearflags/buf_setflags... these are the writable external flags
  */
-#define BUF_X_WRFLAGS (B_LOCKED | B_NOCACHE | B_ASYNC | B_READ | B_WRITE | B_PAGEIO)
+#define BUF_X_WRFLAGS (B_PHYS | B_RAW | B_LOCKED | B_ASYNC | B_READ | B_WRITE | B_PAGEIO |\
+                      B_NOCACHE | B_FUA | B_PASSIVE)
 
 /*
  * These flags are kept in b_flags... access is lockless
@@ -167,7 +168,7 @@ struct buf {
 #define        B_AGE           0x00200000      /* Move to age queue when I/O done. */
 #define B_FILTER       0x00400000      /* call b_iodone from biodone as an in-line filter */
 #define        B_CALL          0x00800000      /* Call b_iodone from biodone, assumes b_iodone consumes bp */
-#define        B_RAW           0x01000000      /* Set by physio for raw transfers. */
+#define B_EOT          0x01000000      /* last buffer in a transaction list created by cluster_io */
 #define        B_WASDIRTY      0x02000000      /* page was found dirty in the VM cache */
 #define        B_HDRALLOC      0x04000000      /* zone allocated buffer header */
 #define        B_ZALLOC        0x08000000      /* b_datap is zalloc()ed */
@@ -192,9 +193,11 @@ struct buf {
 #define B_NOBUFF       0x04    /* Do not allocate struct buf */
 
 
-extern int niobuf;             /* The number of IO buffer headers for cluster IO */
-extern int nbuf;               /* The number of buffer headers */
-extern struct buf *buf;                /* The buffer headers. */
+extern int niobuf_headers;             /* The number of IO buffer headers for cluster IO */
+extern int nbuf_headers;               /* The number of buffer headers */
+extern int max_nbuf_headers;           /* The max number of buffer headers */
+extern int nbuf_hashelements;          /* The number of elements in bufhash */
+extern struct buf *buf_headers;                /* The buffer headers. */
 
 
 /*
@@ -216,7 +219,7 @@ buf_t       alloc_io_buf(vnode_t, int);
 void   free_io_buf(buf_t);
 
 int    allocbuf(struct buf *, int);
-void   bufinit(void);
+void   bufinit(void) __attribute__((section("__TEXT, initcode")));
 
 void   buf_setfilter(buf_t, void (*)(buf_t, void *), void *, void **, void **);
 
@@ -228,7 +231,12 @@ void       buf_setfilter(buf_t, void (*)(buf_t, void *), void *, void **, void **);
 #define BAC_SKIP_NONLOCKED     0x04    /* Don't return LOCKED buffers */
 #define BAC_SKIP_LOCKED                0x08    /* Only return LOCKED buffers */
 
-void   cluster_init(void);
+void   buf_list_lock(void);
+void   buf_list_unlock(void);
+
+void   buf_biowait_callback(buf_t);
+
+void   cluster_init(void) __attribute__((section("__TEXT, initcode")));
 void   buf_drop(buf_t);
 errno_t        buf_acquire(buf_t, int, int, int);