X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/c0fea4742e91338fffdcf79f86a7c1d5e2b97eb1..7e4a7d3939db04e70062ae6c7bf24b8c8b2f5a7c:/bsd/sys/buf_internal.h diff --git a/bsd/sys/buf_internal.h b/bsd/sys/buf_internal.h index ec3a84dcc..a11222c07 100644 --- a/bsd/sys/buf_internal.h +++ b/bsd/sys/buf_internal.h @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2008 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 */ /* @@ -84,26 +90,26 @@ struct buf { 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. */ @@ -114,8 +120,8 @@ struct buf { 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 }; @@ -125,6 +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... @@ -133,17 +140,24 @@ 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 */ +#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 @@ -160,7 +174,7 @@ 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 */ @@ -173,10 +187,6 @@ struct buf { */ #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. */ @@ -185,11 +195,11 @@ 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. */ /* @@ -211,9 +221,7 @@ 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 **); +void bufinit(void) __attribute__((section("__TEXT, initcode"))); /* * Flags for buf_acquire @@ -223,7 +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);