6c8f7fc3ba
. add all sys/sys headers not already present to help compiling . take netbsd dirent.h and struct dirent; main result is introducing d_type and d_namlen that have to be set by getdents() in all FS code implementing it . d_off is gone . alignment of the struct has become 8 bytes instead of 4 . remove _MAX_BLOCK_SIZE, _MIN_BLOCK_SIZE, _STATIC_BLOCK_SIZE . libminlib: cleanup unused yet duplicate code . mfs: throw out the long-broken v1, v2 support . new test for dirent contents filled by getdents() Change-Id: I1459755c7ba5e5d1c9396d3a587ce6e63ddc283e
311 lines
11 KiB
C
311 lines
11 KiB
C
/* $NetBSD: buf.h,v 1.119 2012/02/17 08:45:11 yamt Exp $ */
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/*-
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* Copyright (c) 1999, 2000, 2007, 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center, and by Andrew Doran.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)buf.h 8.9 (Berkeley) 3/30/95
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*/
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#ifndef _SYS_BUF_H_
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#define _SYS_BUF_H_
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#include <sys/pool.h>
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#include <sys/queue.h>
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#include <sys/mutex.h>
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#include <sys/condvar.h>
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#include <sys/rbtree.h>
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#if defined(_KERNEL)
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#include <sys/workqueue.h>
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#endif /* defined(_KERNEL) */
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struct buf;
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struct mount;
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struct vnode;
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struct kauth_cred;
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#define NOLIST ((struct buf *)0x87654321)
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extern kmutex_t bufcache_lock;
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extern kmutex_t buffer_lock;
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/*
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* The buffer header describes an I/O operation in the kernel.
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*
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* Field markings and the corresponding locks:
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*
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* b thread of execution that holds BC_BUSY, does not correspond
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* directly to any particular LWP
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* c bufcache_lock
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* o b_objlock
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*
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* For buffers associated with a vnode, b_objlock points to vp->v_interlock.
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* If not associated with a vnode, it points to the generic buffer_lock.
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*/
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struct buf {
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union {
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TAILQ_ENTRY(buf) u_actq;
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rb_node_t u_rbnode;
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#if defined(_KERNEL) /* u_work is smaller than u_actq. XXX */
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struct work u_work;
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#endif /* defined(_KERNEL) */
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} b_u; /* b: device driver queue */
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#define b_actq b_u.u_actq
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#define b_work b_u.u_work
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void (*b_iodone)(struct buf *);/* b: call when done */
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int b_error; /* b: errno value. */
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int b_resid; /* b: remaining I/O. */
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u_int b_flags; /* b: B_* flags */
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int b_prio; /* b: priority for queue */
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int b_bufsize; /* b: allocated size */
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int b_bcount; /* b: valid bytes in buffer */
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dev_t b_dev; /* b: associated device */
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void *b_data; /* b: fs private data */
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daddr_t b_blkno; /* b: physical block number
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(partition relative) */
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daddr_t b_rawblkno; /* b: raw physical block number
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(volume relative) */
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struct proc *b_proc; /* b: proc if BB_PHYS */
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void *b_saveaddr; /* b: saved b_data for physio */
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/*
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* b: private data for owner.
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* - buffer cache buffers are owned by corresponding filesystem.
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* - non-buffer cache buffers are owned by subsystem which
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* allocated them. (filesystem, disk driver, etc)
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*/
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void *b_private;
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off_t b_dcookie; /* NFS: Offset cookie if dir block */
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kcondvar_t b_busy; /* c: threads waiting on buf */
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u_int b_refcnt; /* c: refcount for b_busy */
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void *b_unused; /* : unused */
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LIST_ENTRY(buf) b_hash; /* c: hash chain */
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LIST_ENTRY(buf) b_vnbufs; /* c: associated vnode */
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TAILQ_ENTRY(buf) b_freelist; /* c: position if not active */
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LIST_ENTRY(buf) b_wapbllist; /* c: transaction buffer list */
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daddr_t b_lblkno; /* c: logical block number */
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int b_freelistindex;/* c: free list index (BQ_) */
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u_int b_cflags; /* c: BC_* flags */
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struct vnode *b_vp; /* c: file vnode */
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kcondvar_t b_done; /* o: waiting on completion */
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u_int b_oflags; /* o: BO_* flags */
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kmutex_t *b_objlock; /* o: completion lock */
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};
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/*
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* For portability with historic industry practice, the cylinder number has
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* to be maintained in the `b_resid' field.
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*/
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#define b_cylinder b_resid /* Cylinder number for disksort(). */
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/*
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* These flags are kept in b_cflags (owned by buffer cache).
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*/
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#define BC_AGE 0x00000001 /* Move to age queue when I/O done. */
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#define BC_BUSY 0x00000010 /* I/O in progress. */
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#define BC_INVAL 0x00002000 /* Does not contain valid info. */
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#define BC_NOCACHE 0x00008000 /* Do not cache block after use. */
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#define BC_WANTED 0x00800000 /* Process wants this buffer. */
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#define BC_VFLUSH 0x04000000 /* Buffer is being synced. */
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/*
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* These flags are kept in b_oflags (owned by associated object).
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*/
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#define BO_DELWRI 0x00000080 /* Delay I/O until buffer reused. */
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#define BO_DONE 0x00000200 /* I/O completed. */
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/*
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* These flags are kept in b_flags (owned by buffer holder).
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*/
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#define B_WRITE 0x00000000 /* Write buffer (pseudo flag). */
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#define B_ASYNC 0x00000004 /* Start I/O, do not wait. */
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#define B_COWDONE 0x00000400 /* Copy-on-write already done. */
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#define B_GATHERED 0x00001000 /* LFS: already in a segment. */
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#define B_LOCKED 0x00004000 /* Locked in core (not reusable). */
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#define B_PHYS 0x00040000 /* I/O to user memory. */
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#define B_RAW 0x00080000 /* Set by physio for raw transfers. */
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#define B_READ 0x00100000 /* Read buffer. */
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#define B_DEVPRIVATE 0x02000000 /* Device driver private flag. */
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#define BUF_FLAGBITS \
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"\20\1AGE\3ASYNC\4BAD\5BUSY\10DELWRI" \
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"\12DONE\13COWDONE\15GATHERED\16INVAL\17LOCKED\20NOCACHE" \
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"\23PHYS\24RAW\25READ\32DEVPRIVATE\33VFLUSH"
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/* Avoid weird code due to B_WRITE being a "pseudo flag" */
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#define BUF_ISREAD(bp) (((bp)->b_flags & B_READ) == B_READ)
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#define BUF_ISWRITE(bp) (((bp)->b_flags & B_READ) == B_WRITE)
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/*
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* This structure describes a clustered I/O. It is stored in the b_saveaddr
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* field of the buffer on which I/O is done. At I/O completion, cluster
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* callback uses the structure to parcel I/O's to individual buffers, and
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* then free's this structure.
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*/
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struct cluster_save {
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long bs_bcount; /* Saved b_bcount. */
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long bs_bufsize; /* Saved b_bufsize. */
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void *bs_saveaddr; /* Saved b_addr. */
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int bs_nchildren; /* Number of associated buffers. */
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struct buf *bs_children; /* List of associated buffers. */
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};
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/*
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* Zero out the buffer's data area.
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*/
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#define clrbuf(bp) \
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do { \
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memset((bp)->b_data, 0, (u_int)(bp)->b_bcount); \
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(bp)->b_resid = 0; \
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} while (/* CONSTCOND */ 0)
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/* Flags to low-level allocation routines. */
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#define B_CLRBUF 0x01 /* Request allocated buffer be cleared. */
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#define B_SYNC 0x02 /* Do all allocations synchronously. */
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#define B_METAONLY 0x04 /* Return indirect block buffer. */
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#define B_CONTIG 0x08 /* Allocate file contiguously. */
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/* Flags to bread() and breadn(). */
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#define B_MODIFY 0x01 /* Hint: caller might modify buffer */
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#ifdef _KERNEL
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#define BIO_GETPRIO(bp) ((bp)->b_prio)
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#define BIO_SETPRIO(bp, prio) (bp)->b_prio = (prio)
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#define BIO_COPYPRIO(bp1, bp2) BIO_SETPRIO(bp1, BIO_GETPRIO(bp2))
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#define BPRIO_NPRIO 3
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#define BPRIO_TIMECRITICAL 2
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#define BPRIO_TIMELIMITED 1
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#define BPRIO_TIMENONCRITICAL 0
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#define BPRIO_DEFAULT BPRIO_TIMELIMITED
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extern u_int nbuf; /* The number of buffer headers */
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/*
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* Definitions for the buffer free lists.
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*/
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#define BQUEUES 4 /* number of free buffer queues */
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#define BQ_LOCKED 0 /* super-blocks &c */
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#define BQ_LRU 1 /* lru, useful buffers */
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#define BQ_AGE 2 /* rubbish */
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#define BQ_EMPTY 3 /* buffer headers with no memory */
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struct bqueue {
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TAILQ_HEAD(, buf) bq_queue;
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uint64_t bq_bytes;
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buf_t *bq_marker;
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};
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extern struct bqueue bufqueues[BQUEUES];
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__BEGIN_DECLS
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int allocbuf(buf_t *, int, int);
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void bawrite(buf_t *);
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void bdwrite(buf_t *);
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void biodone(buf_t *);
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int biowait(buf_t *);
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int bread(struct vnode *, daddr_t, int, struct kauth_cred *, int, buf_t **);
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int breadn(struct vnode *, daddr_t, int, daddr_t *, int *, int,
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struct kauth_cred *, int, buf_t **);
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void brelsel(buf_t *, int);
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void brelse(buf_t *, int);
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void bremfree(buf_t *);
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void bufinit(void);
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void bufinit2(void);
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int bwrite(buf_t *);
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buf_t *getblk(struct vnode *, daddr_t, int, int, int);
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buf_t *geteblk(int);
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buf_t *incore(struct vnode *, daddr_t);
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void minphys(buf_t *);
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int physio(void (*)(buf_t *), buf_t *, dev_t, int,
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void (*)(buf_t *), struct uio *);
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void brelvp(buf_t *);
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void reassignbuf(buf_t *, struct vnode *);
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void bgetvp(struct vnode *, buf_t *);
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int buf_syncwait(void);
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u_long buf_memcalc(void);
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int buf_drain(int);
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int buf_setvalimit(vsize_t);
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#if defined(DDB) || defined(DEBUGPRINT)
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void vfs_buf_print(buf_t *, int, void (*)(const char *, ...)
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__printflike(1, 2));
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#endif
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buf_t *getiobuf(struct vnode *, bool);
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void putiobuf(buf_t *);
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void buf_init(buf_t *);
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void buf_destroy(buf_t *);
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int bbusy(buf_t *, bool, int, kmutex_t *);
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void nestiobuf_iodone(buf_t *);
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void nestiobuf_setup(buf_t *, buf_t *, int, size_t);
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void nestiobuf_done(buf_t *, int, int);
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__END_DECLS
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#endif /* _KERNEL */
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#endif /* !_SYS_BUF_H_ */
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