* Copyright (c) 2000-2014 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* 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
* 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.
- *
+ *
* 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,
* 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_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
*/
#ifndef _SYS_BUF_INTERNAL_H_
-#define _SYS_BUF_INTERNAL_H_
+#define _SYS_BUF_INTERNAL_H_
#include <sys/appleapiopts.h>
struct cpx *ba_cpx;
uint64_t ba_cp_file_off;
#endif
- uint64_t ba_flags; /* flags. Some are only in-use on embedded devices */
+ uint64_t ba_flags; /* flags. Some are only in-use on embedded devices */
};
/*
* The buffer header describes an I/O operation in the kernel.
*/
struct buf {
- LIST_ENTRY(buf) b_hash; /* Hash chain. */
- 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 */
- 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. */
- 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.*/
- 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; /* 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_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. */
+ LIST_ENTRY(buf) b_hash; /* Hash chain. */
+ 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 */
+ struct timeval b_timestamp_tv; /* microuptime for disk conditioner */
+ 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. */
+ 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.*/
+ 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; /* 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_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. */
+ 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;
- void * b_stackbrelse[6];
- void * b_stackgetblk[6];
+ void * b_owner;
+ int b_tag;
+ void * b_lastbrelse;
+ void * b_stackbrelse[6];
+ void * b_stackgetblk[6];
#endif
};
/* cluster_io definitions for use with io bufs */
#define b_uploffset b_bufsize
-#define b_orig b_freelist.tqe_prev
+#define b_orig b_freelist.tqe_prev
#define b_shadow b_freelist.tqe_next
-#define b_shadow_ref b_validoff
+#define b_shadow_ref b_validoff
#ifdef BUF_MAKE_PRIVATE
#define b_data_ref b_validend
#endif
* 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
-#define BL_IOBUF_VDEV 0x00000400 /* iobuf was for a diskimage */
+#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
+#define BL_IOBUF_VDEV 0x00000400 /* iobuf was for a diskimage */
/*
- * Parameters for buffer cache garbage collection
+ * 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 */
+#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_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)
+ 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_PHYS | B_RAW | B_LOCKED | B_ASYNC | B_READ | B_WRITE | B_PAGEIO |\
- B_NOCACHE | B_FUA | B_PASSIVE | B_IOSTREAMING)
+ 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 */
+#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
* External flags are defined in buf.h and cannot overlap
* the internal flags
- *
+ *
* these flags are internal... there definition may change
*/
-#define B_CACHE 0x00010000 /* getblk found us in the cache. */
-#define B_DONE 0x00020000 /* I/O completed. */
-#define B_INVAL 0x00040000 /* Does not contain valid info. */
-#define B_ERROR 0x00080000 /* I/O error occurred. */
-#define B_EINTR 0x00100000 /* I/O was interrupted */
-#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_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_CACHE 0x00010000 /* getblk found us in the cache. */
+#define B_DONE 0x00020000 /* I/O completed. */
+#define B_INVAL 0x00040000 /* Does not contain valid info. */
+#define B_ERROR 0x00080000 /* I/O error occurred. */
+#define B_EINTR 0x00100000 /* I/O was interrupted */
+#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_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_COMMIT_UPL 0x40000000 /* commit/abort the UPL on I/O success/failure */
-#define B_TDONE 0x80000000 /* buf_t that is part of a cluster level transaction has completed */
+#define B_COMMIT_UPL 0x40000000 /* commit/abort the UPL on I/O success/failure */
+#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 */
+#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)
*/
#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
+#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_IO_TIER_MASK 0x00000f00
+#define BA_IO_TIER_SHIFT 8
-#define BA_ISOCHRONOUS 0x00001000 /* device specific isochronous throughput to media */
+#define BA_ISOCHRONOUS 0x00001000 /* device specific isochronous throughput to media */
#define BA_STRATEGY_TRACKED_IO 0x00002000 /* tracked by spec_strategy */
+#define BA_IO_TIER_UPGRADE 0x00004000 /* effective I/O tier is higher than BA_IO_TIER */
-#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); \
+#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_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. */
+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. */
/*
* Definitions for the buffer free lists.
*/
-#define BQUEUES 6 /* 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 */
+#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 */
__BEGIN_DECLS
-buf_t alloc_io_buf(vnode_t, int);
-void free_io_buf(buf_t);
+buf_t alloc_io_buf(vnode_t, int);
+void free_io_buf(buf_t);
-int allocbuf(struct buf *, int);
-void bufinit(void);
+int allocbuf(struct buf *, int);
+void bufinit(void);
-void buf_list_lock(void);
-void buf_list_unlock(void);
+void buf_list_lock(void);
+void buf_list_unlock(void);
-void cluster_init(void);
+void cluster_init(void);
-int count_busy_buffers(void);
+int count_busy_buffers(void);
-int buf_flushdirtyblks_skipinfo (vnode_t, int, int, const char *);
-void buf_wait_for_shadow_io (vnode_t, daddr64_t);
+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);
+errno_t buf_make_private(buf_t bp);
#endif
#ifdef CONFIG_PROTECT
-void buf_setcpoff (buf_t, uint64_t);
+void buf_setcpoff(buf_t, uint64_t);
#endif
__END_DECLS
* Stats on usefulness of the buffer cache
*/
struct bufstats {
- long bufs_incore; /* found incore */
- long bufs_busyincore; /* found incore. was busy */
- long bufs_vmhits; /* not incore. found in VM */
- long bufs_miss; /* not incore. not in VM */
- long bufs_sleeps; /* buffer starvation */
- long bufs_eblk; /* Calls to geteblk */
- long bufs_iobufmax; /* Max. number of IO buffers used */
- long bufs_iobufinuse; /* number of IO buffers in use */
- long bufs_iobufsleeps; /* IO buffer starvation */
- long bufs_iobufinuse_vdev; /* number of IO buffers in use by
- diskimages */
+ long bufs_incore; /* found incore */
+ long bufs_busyincore; /* found incore. was busy */
+ long bufs_vmhits; /* not incore. found in VM */
+ long bufs_miss; /* not incore. not in VM */
+ long bufs_sleeps; /* buffer starvation */
+ long bufs_eblk; /* Calls to geteblk */
+ long bufs_iobufmax; /* Max. number of IO buffers used */
+ long bufs_iobufinuse; /* number of IO buffers in use */
+ long bufs_iobufsleeps; /* IO buffer starvation */
+ long bufs_iobufinuse_vdev; /* number of IO buffers in use by
+ * diskimages */
};
#endif /* KERNEL */
projects / apple / xnu.git / blobdiff