/*
- * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2014 Apple 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 */
/*
#include <sys/buf.h>
#include <sys/lock.h>
-
-extern lck_mtx_t *buf_mtxp;
#define NOLIST ((struct buf *)0x87654321)
+/*
+ * Attributes of an I/O to be used by lower layers
+ */
+struct bufattr {
+#if CONFIG_PROTECT
+ struct cprotect *ba_cpentry; /* address of cp_entry */
+ uint64_t ba_cp_file_off; /* rounded file offset. See buf_setcpoff() for more comments */
+#endif
+ uint64_t ba_flags; /* flags. Some are only in-use on embedded devices */
+};
+
/*
* The buffer header describes an I/O operation in the kernel.
*/
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. */
int b_validoff; /* Offset in buffer of valid region. */
int b_validend; /* Offset of end of valid region. */
+
+ /* store extra information related to redundancy of data, such as
+ * which redundancy copy to use, etc
+ */
+ uint32_t b_redundancy_flags;
+
proc_t b_proc; /* Associated proc; NULL if kernel. */
+#ifdef BUF_MAKE_PRIVATE
+ buf_t b_data_store;
+#endif
+ struct bufattr b_attr;
#ifdef JOE_DEBUG
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
};
+extern vm_offset_t buf_kernel_addrperm;
/* cluster_io definitions for use with io bufs */
#define b_uploffset b_bufsize
+#define b_orig b_freelist.tqe_prev
+#define b_shadow b_freelist.tqe_next
+#define b_shadow_ref b_validoff
+#ifdef BUF_MAKE_PRIVATE
+#define b_data_ref b_validend
+#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...
+ * These flags are kept in b_lflags...
* buf_mtxp must be held before examining/updating
*/
#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_WANTDEALLOC 0x00000010 /* buffer should be put on empty list when clean */
+#define BL_SHADOW 0x00000020
+#define BL_EXTERNAL 0x00000040
+#define BL_WAITSHADOW 0x00000080
+#define BL_IOBUF_ALLOC 0x00000100
+#define BL_WANTED_REF 0x00000200
+/*
+ * Parameters for buffer cache garbage collection
+ */
+#define BUF_STALE_THRESHHOLD 30 /* Collect if untouched in the last 30 seconds */
+#define BUF_MAX_GC_BATCH_SIZE 64 /* Under a single grab of the lock */
/*
* 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_ENCRYPTED_IO | B_STATICCONTENT)
/*
* 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)
+
+#if 0
+/* b_flags defined in buf.h */
+#define B_WRITE 0x00000000 /* Write buffer (pseudo flag). */
+#define B_READ 0x00000001 /* Read buffer. */
+#define B_ASYNC 0x00000002 /* Start I/O, do not wait. */
+#define B_NOCACHE 0x00000004 /* Do not cache block after use. */
+#define B_DELWRI 0x00000008 /* Delay I/O until buffer reused. */
+#define B_LOCKED 0x00000010 /* Locked in core (not reusable). */
+#define B_PHYS 0x00000020 /* I/O to user memory. */
+#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 */
+#define B_IOSTREAMING 0x00001000 /* sequential access pattern detected */
+#define B_ENCRYPTED_IO 0x00004000 /* Encrypted I/O */
+#define B_STATICCONTENT 0x00008000 /* Buffer is likely to remain unaltered */
+#endif
/*
* 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 */
/*
* private flags used by by the cluster layer
*/
-#define B_NEED_IODONE 0x20000000 /* need biodone on the real_bp associated with a cluster_io */
+#define B_TWANTED 0x20000000 /* but_t that is part of a cluster level transaction is wanted */
#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. */
-
+#define B_TDONE 0x80000000 /* buf_t that is part of a cluster level transaction has completed */
/* Flags to low-level allocation routines. */
#define B_CLRBUF 0x01 /* Request allocated buffer be cleared. */
#define B_SYNC 0x02 /* Do all allocations synchronously. */
#define B_NOBUFF 0x04 /* Do not allocate struct buf */
+/*
+ * ba_flags (Buffer Attribute flags)
+ * Some of these may be in-use only on embedded devices.
+ */
+#define BA_RAW_ENCRYPTED_IO 0x00000001
+#define BA_THROTTLED_IO 0x00000002
+#define BA_DELAYIDLESLEEP 0x00000004 /* Process is marked to delay idle sleep on disk IO */
+#define BA_NOCACHE 0x00000008
+#define BA_META 0x00000010
+#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) \
+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; /* 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. */
/*
__BEGIN_DECLS
+buf_t buf_create_shadow_priv(buf_t bp, boolean_t force_copy, uintptr_t external_storage, void (*iodone)(buf_t, void *), void *arg);
+
buf_t alloc_io_buf(vnode_t, int);
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 **);
-
/*
* Flags for buf_acquire
*/
#define BAC_SKIP_NONLOCKED 0x04 /* Don't return LOCKED buffers */
#define BAC_SKIP_LOCKED 0x08 /* Only return LOCKED buffers */
+void buf_list_lock(void);
+void buf_list_unlock(void);
+
void cluster_init(void);
void buf_drop(buf_t);
errno_t buf_acquire(buf_t, int, int, int);
int count_busy_buffers(void);
int count_lock_queue(void);
+int buf_flushdirtyblks_skipinfo (vnode_t, int, int, const char *);
+void buf_wait_for_shadow_io (vnode_t, daddr64_t);
+
+#ifdef BUF_MAKE_PRIVATE
+errno_t buf_make_private(buf_t bp);
+#endif
+
+#ifdef CONFIG_PROTECT
+void buf_setcpaddr(buf_t, struct cprotect *);
+void buf_setcpoff (buf_t, uint64_t);
+#endif
__END_DECLS
projects / apple / xnu.git / blobdiff