/*
- * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
LIST_ENTRY(buf) b_vnbufs; /* Buffer's associated vnode. */
TAILQ_ENTRY(buf) b_freelist; /* Free list position if not active. */
int b_timestamp; /* timestamp for queuing operation */
- long b_whichq; /* the free list the buffer belongs to */
- volatile long b_flags; /* B_* flags. */
- volatile long b_lflags; /* BL_BUSY | BL_WANTED flags... protected by buf_mtx */
+ int b_whichq; /* the free list the buffer belongs to */
+ volatile uint32_t b_flags; /* B_* flags. */
+ volatile uint32_t b_lflags; /* BL_BUSY | BL_WANTED flags... protected by buf_mtx */
int b_error; /* errno value. */
- long b_bufsize; /* Allocated buffer size. */
- long b_bcount; /* Valid bytes in buffer. */
- long b_resid; /* Remaining I/O. */
+ int b_bufsize; /* Allocated buffer size. */
+ int b_bcount; /* Valid bytes in buffer. */
+ int b_resid; /* Remaining I/O. */
dev_t b_dev; /* Device associated with buffer. */
- uintptr_t b_datap; /* Memory, superblocks, indirect etc.*/
+ uintptr_t b_datap; /* Memory, superblocks, indirect etc.*/
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 */
void * b_drvdata; /* Device driver private use */
- void * b_fsprivate; /* filesystem private use */
+ void * b_fsprivate; /* filesystem private use */
void * b_transaction; /* journal private use */
int b_dirtyoff; /* Offset in buffer of dirty region. */
int b_dirtyend; /* Offset of end of dirty region. */
void * b_owner;
int b_tag;
void * b_lastbrelse;
- int b_stackbrelse[6];
- int b_stackgetblk[6];
+ void * b_stackbrelse[6];
+ void * b_stackgetblk[6];
#endif
};
#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...
#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 */
+#define BL_WANTDEALLOC 0x00000010 /* buffer should be put on empty list when clean */
+/*
+ * Parameters for buffer cache garbage collection
+ */
+#define BUF_STALE_THRESHHOLD 30 /* Collect if untouched in the last 30 seconds */
/*
* 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 | B_IOSTREAMING | B_THROTTLED_IO)
/*
* 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 | B_IOSTREAMING)
/*
* These flags are kept in b_flags... access is lockless
#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 */
*/
#define B_NEED_IODONE 0x20000000 /* need biodone on the real_bp associated with a cluster_io */
#define B_COMMIT_UPL 0x40000000 /* commit/abort the UPL on I/O success/failure */
-/*
- * can we deprecate?
- */
-#define B_TAPE 0x80000000 /* Magnetic tape I/O. */
/* Flags to low-level allocation routines. */
#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. */
/*
void free_io_buf(buf_t);
int allocbuf(struct buf *, int);
-void bufinit(void);
-
-void buf_setfilter(buf_t, void (*)(buf_t, void *), void *, void **, void **);
+void bufinit(void) __attribute__((section("__TEXT, initcode")));
/*
* Flags for buf_acquire
#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);
projects / apple / xnu.git / blobdiff