588 lines
16 KiB
C
588 lines
16 KiB
C
/* $NetBSD: lfs_bio.c,v 1.36 2001/07/13 20:30:23 perseant Exp $ */
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/*-
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* Copyright (c) 1999, 2000 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 Konrad E. Schroder <perseant@hhhh.org>.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* @(#)lfs_bio.c 8.10 (Berkeley) 6/10/95
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#include <sys/vnode.h>
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#include <sys/resourcevar.h>
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#include <sys/mount.h>
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#include <sys/kernel.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <sys/malloc.h>
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#include <ufs/lfs/lfs.h>
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#include <ufs/lfs/lfs_extern.h>
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/* Macros to clear/set/test flags. */
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# define SET(t, f) (t) |= (f)
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# define CLR(t, f) (t) &= ~(f)
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# define ISSET(t, f) ((t) & (f))
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/*
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* LFS block write function.
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*
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* XXX
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* No write cost accounting is done.
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* This is almost certainly wrong for synchronous operations and NFS.
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*/
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int lfs_allclean_wakeup; /* Cleaner wakeup address. */
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int locked_queue_count = 0; /* XXX Count of locked-down buffers. */
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long locked_queue_bytes = 0L; /* XXX Total size of locked buffers. */
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int lfs_writing = 0; /* Set if already kicked off a writer
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because of buffer space */
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extern int lfs_dostats;
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/*
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* Try to reserve some blocks, prior to performing a sensitive operation that
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* requires the vnode lock to be honored. If there is not enough space, give
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* up the vnode lock temporarily and wait for the space to become available.
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*
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* Called with vp locked. (Note nowever that if nb < 0, vp is ignored.)
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*/
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int
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lfs_reserve(struct lfs *fs, struct vnode *vp, int nb)
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{
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CLEANERINFO *cip;
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struct buf *bp;
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int error, slept;
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slept = 0;
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while (nb > 0 && !lfs_fits(fs, nb + fs->lfs_ravail)) {
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VOP_UNLOCK(vp, 0);
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if (!slept) {
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#ifdef DEBUG
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printf("lfs_reserve: waiting for %ld (bfree = %d,"
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" est_bfree = %d)\n",
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nb + fs->lfs_ravail, fs->lfs_bfree,
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LFS_EST_BFREE(fs));
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#endif
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}
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++slept;
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/* Wake up the cleaner */
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LFS_CLEANERINFO(cip, fs, bp);
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LFS_SYNC_CLEANERINFO(cip, fs, bp, 0);
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wakeup(&lfs_allclean_wakeup);
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wakeup(&fs->lfs_nextseg);
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error = tsleep(&fs->lfs_avail, PCATCH | PUSER, "lfs_reserve",
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0);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX use lockstatus */
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if (error)
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return error;
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}
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if (slept)
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printf("lfs_reserve: woke up\n");
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fs->lfs_ravail += nb;
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return 0;
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}
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/*
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*
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* XXX we don't let meta-data writes run out of space because they can
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* come from the segment writer. We need to make sure that there is
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* enough space reserved so that there's room to write meta-data
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* blocks.
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*
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* Also, we don't let blocks that have come to us from the cleaner
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* run out of space.
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*/
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#define CANT_WAIT(BP,F) (IS_IFILE((BP)) || (BP)->b_lblkno<0 || ((F) & BW_CLEAN))
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int
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lfs_bwrite(void *v)
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{
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struct vop_bwrite_args /* {
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struct buf *a_bp;
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} */ *ap = v;
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struct buf *bp = ap->a_bp;
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struct inode *ip;
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ip = VTOI(bp->b_vp);
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#ifdef DIAGNOSTIC
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if (VTOI(bp->b_vp)->i_lfs->lfs_ronly == 0 && (bp->b_flags & B_ASYNC)) {
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panic("bawrite LFS buffer");
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}
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#endif /* DIAGNOSTIC */
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return lfs_bwrite_ext(bp,0);
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}
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/*
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* Determine if there is enough room currently available to write db
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* disk blocks. We need enough blocks for the new blocks, the current
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* inode blocks, a summary block, plus potentially the ifile inode and
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* the segment usage table, plus an ifile page.
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*/
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int
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lfs_fits(struct lfs *fs, int fsb)
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{
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int needed;
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needed = fsb + btofsb(fs, fs->lfs_sumsize) +
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fsbtodb(fs, howmany(fs->lfs_uinodes + 1, INOPB(fs)) +
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fs->lfs_segtabsz + btofsb(fs, fs->lfs_sumsize));
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if (needed >= fs->lfs_avail) {
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#ifdef DEBUG
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printf("lfs_fits: no fit: fsb = %d, uinodes = %d, "
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"needed = %d, avail = %d\n",
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fsb, fs->lfs_uinodes, needed, fs->lfs_avail);
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#endif
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return 0;
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}
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return 1;
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}
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int
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lfs_availwait(struct lfs *fs, int db)
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{
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int error;
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CLEANERINFO *cip;
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struct buf *cbp;
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while (!lfs_fits(fs, db)) {
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/*
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* Out of space, need cleaner to run.
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* Update the cleaner info, then wake it up.
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* Note the cleanerinfo block is on the ifile
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* so it CANT_WAIT.
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*/
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LFS_CLEANERINFO(cip, fs, cbp);
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LFS_SYNC_CLEANERINFO(cip, fs, cbp, 0);
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printf("lfs_availwait: out of available space, "
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"waiting on cleaner\n");
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wakeup(&lfs_allclean_wakeup);
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wakeup(&fs->lfs_nextseg);
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#ifdef DIAGNOSTIC
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if (fs->lfs_seglock && fs->lfs_lockpid == curproc->p_pid)
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panic("lfs_availwait: deadlock");
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#endif
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error = tsleep(&fs->lfs_avail, PCATCH | PUSER, "cleaner", 0);
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if (error)
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return (error);
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}
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return 0;
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}
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int
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lfs_bwrite_ext(struct buf *bp, int flags)
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{
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struct lfs *fs;
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struct inode *ip;
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int fsb, error, s;
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/*
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* Don't write *any* blocks if we're mounted read-only.
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* In particular the cleaner can't write blocks either.
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*/
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if(VTOI(bp->b_vp)->i_lfs->lfs_ronly) {
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bp->b_flags &= ~(B_DELWRI | B_READ | B_ERROR);
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LFS_UNLOCK_BUF(bp);
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if(bp->b_flags & B_CALL)
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bp->b_flags &= ~B_BUSY;
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else
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brelse(bp);
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return EROFS;
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}
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/*
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* Set the delayed write flag and use reassignbuf to move the buffer
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* from the clean list to the dirty one.
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*
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* Set the B_LOCKED flag and unlock the buffer, causing brelse to move
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* the buffer onto the LOCKED free list. This is necessary, otherwise
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* getnewbuf() would try to reclaim the buffers using bawrite, which
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* isn't going to work.
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*
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* XXX we don't let meta-data writes run out of space because they can
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* come from the segment writer. We need to make sure that there is
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* enough space reserved so that there's room to write meta-data
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* blocks.
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*/
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if (!(bp->b_flags & B_LOCKED)) {
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fs = VFSTOUFS(bp->b_vp->v_mount)->um_lfs;
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fsb = fragstofsb(fs, numfrags(fs, bp->b_bcount));
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if (!CANT_WAIT(bp, flags)) {
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if ((error = lfs_availwait(fs, fsb)) != 0) {
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brelse(bp);
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return error;
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}
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}
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ip = VTOI(bp->b_vp);
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if (bp->b_flags & B_CALL) {
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LFS_SET_UINO(ip, IN_CLEANING);
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} else {
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LFS_SET_UINO(ip, IN_MODIFIED);
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if (bp->b_lblkno >= 0)
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LFS_SET_UINO(ip, IN_UPDATE);
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}
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fs->lfs_avail -= fsb;
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bp->b_flags |= B_DELWRI;
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LFS_LOCK_BUF(bp);
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bp->b_flags &= ~(B_READ | B_ERROR);
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s = splbio();
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reassignbuf(bp, bp->b_vp);
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splx(s);
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}
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if(bp->b_flags & B_CALL)
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bp->b_flags &= ~B_BUSY;
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else
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brelse(bp);
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return (0);
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}
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void
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lfs_flush_fs(struct lfs *fs, int flags)
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{
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if(fs->lfs_ronly == 0 && fs->lfs_dirops == 0)
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{
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/* disallow dirops during flush */
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fs->lfs_writer++;
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/*
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* We set the queue to 0 here because we
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* are about to write all the dirty
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* buffers we have. If more come in
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* while we're writing the segment, they
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* may not get written, so we want the
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* count to reflect these new writes
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* after the segwrite completes.
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*/
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if(lfs_dostats)
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++lfs_stats.flush_invoked;
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lfs_segwrite(fs->lfs_ivnode->v_mount, flags);
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/* XXX KS - allow dirops again */
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if(--fs->lfs_writer==0)
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wakeup(&fs->lfs_dirops);
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}
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}
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/*
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* XXX
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* This routine flushes buffers out of the B_LOCKED queue when LFS has too
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* many locked down. Eventually the pageout daemon will simply call LFS
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* when pages need to be reclaimed. Note, we have one static count of locked
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* buffers, so we can't have more than a single file system. To make this
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* work for multiple file systems, put the count into the mount structure.
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*/
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void
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lfs_flush(struct lfs *fs, int flags)
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{
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int s;
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struct mount *mp, *nmp;
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if(lfs_dostats)
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++lfs_stats.write_exceeded;
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if (lfs_writing && flags==0) {/* XXX flags */
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#ifdef DEBUG_LFS
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printf("lfs_flush: not flushing because another flush is active\n");
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#endif
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return;
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}
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lfs_writing = 1;
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simple_lock(&mountlist_slock);
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for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
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if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) {
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nmp = mp->mnt_list.cqe_next;
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continue;
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}
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if (strncmp(&mp->mnt_stat.f_fstypename[0], MOUNT_LFS, MFSNAMELEN)==0)
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lfs_flush_fs(((struct ufsmount *)mp->mnt_data)->ufsmount_u.lfs, flags);
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simple_lock(&mountlist_slock);
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nmp = mp->mnt_list.cqe_next;
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vfs_unbusy(mp);
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}
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simple_unlock(&mountlist_slock);
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#if 1 || defined(DEBUG)
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s = splbio();
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lfs_countlocked(&locked_queue_count, &locked_queue_bytes);
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splx(s);
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wakeup(&locked_queue_count);
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#endif /* 1 || DEBUG */
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lfs_writing = 0;
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}
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int
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lfs_check(struct vnode *vp, ufs_daddr_t blkno, int flags)
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{
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int error;
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struct lfs *fs;
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struct inode *ip;
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extern int lfs_dirvcount;
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error = 0;
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ip = VTOI(vp);
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/* If out of buffers, wait on writer */
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/* XXX KS - if it's the Ifile, we're probably the cleaner! */
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if (ip->i_number == LFS_IFILE_INUM)
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return 0;
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/* If we're being called from inside a dirop, don't sleep */
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if (ip->i_flag & IN_ADIROP)
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return 0;
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fs = ip->i_lfs;
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/*
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* If we would flush below, but dirops are active, sleep.
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* Note that a dirop cannot ever reach this code!
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*/
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while (fs->lfs_dirops > 0 &&
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(locked_queue_count > LFS_MAX_BUFS ||
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locked_queue_bytes > LFS_MAX_BYTES ||
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lfs_dirvcount > LFS_MAXDIROP || fs->lfs_diropwait > 0))
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{
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++fs->lfs_diropwait;
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tsleep(&fs->lfs_writer, PRIBIO+1, "bufdirop", 0);
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--fs->lfs_diropwait;
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}
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if (locked_queue_count > LFS_MAX_BUFS ||
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locked_queue_bytes > LFS_MAX_BYTES ||
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lfs_dirvcount > LFS_MAXDIROP || fs->lfs_diropwait > 0)
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{
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++fs->lfs_writer;
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lfs_flush(fs, flags);
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if(--fs->lfs_writer==0)
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wakeup(&fs->lfs_dirops);
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}
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while (locked_queue_count > LFS_WAIT_BUFS
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|| locked_queue_bytes > LFS_WAIT_BYTES)
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{
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if(lfs_dostats)
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++lfs_stats.wait_exceeded;
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#ifdef DEBUG_LFS
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printf("lfs_check: waiting: count=%d, bytes=%ld\n",
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locked_queue_count, locked_queue_bytes);
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#endif
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error = tsleep(&locked_queue_count, PCATCH | PUSER,
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"buffers", hz * LFS_BUFWAIT);
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if (error != EWOULDBLOCK)
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break;
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/*
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* lfs_flush might not flush all the buffers, if some of the
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* inodes were locked or if most of them were Ifile blocks
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* and we weren't asked to checkpoint. Try flushing again
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* to keep us from blocking indefinitely.
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*/
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if (locked_queue_count > LFS_MAX_BUFS ||
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locked_queue_bytes > LFS_MAX_BYTES)
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{
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++fs->lfs_writer;
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lfs_flush(fs, flags | SEGM_CKP);
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if(--fs->lfs_writer==0)
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wakeup(&fs->lfs_dirops);
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}
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}
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return (error);
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}
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/*
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* Allocate a new buffer header.
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*/
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#ifdef MALLOCLOG
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# define DOMALLOC(S, T, F) _malloc((S), (T), (F), file, line)
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struct buf *
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lfs_newbuf_malloclog(struct lfs *fs, struct vnode *vp, ufs_daddr_t daddr, size_t size, char *file, int line)
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#else
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# define DOMALLOC(S, T, F) malloc((S), (T), (F))
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struct buf *
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lfs_newbuf(struct lfs *fs, struct vnode *vp, ufs_daddr_t daddr, size_t size)
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#endif
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{
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struct buf *bp;
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size_t nbytes;
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int s;
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nbytes = roundup(size, fsbtob(fs, 1));
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|
|
bp = DOMALLOC(sizeof(struct buf), M_SEGMENT, M_WAITOK);
|
|
bzero(bp, sizeof(struct buf));
|
|
if (nbytes)
|
|
bp->b_data = DOMALLOC(nbytes, M_SEGMENT, M_WAITOK);
|
|
if(nbytes) {
|
|
bzero(bp->b_data, nbytes);
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
if(vp==NULL)
|
|
panic("vp is NULL in lfs_newbuf");
|
|
if(bp==NULL)
|
|
panic("bp is NULL after malloc in lfs_newbuf");
|
|
#endif
|
|
s = splbio();
|
|
bgetvp(vp, bp);
|
|
splx(s);
|
|
|
|
bp->b_bufsize = size;
|
|
bp->b_bcount = size;
|
|
bp->b_lblkno = daddr;
|
|
bp->b_blkno = daddr;
|
|
bp->b_error = 0;
|
|
bp->b_resid = 0;
|
|
bp->b_iodone = lfs_callback;
|
|
bp->b_flags |= B_BUSY | B_CALL | B_NOCACHE;
|
|
|
|
return (bp);
|
|
}
|
|
|
|
#ifdef MALLOCLOG
|
|
# define DOFREE(A, T) _free((A), (T), file, line)
|
|
void
|
|
lfs_freebuf_malloclog(struct buf *bp, char *file, int line)
|
|
#else
|
|
# define DOFREE(A, T) free((A), (T))
|
|
void
|
|
lfs_freebuf(struct buf *bp)
|
|
#endif
|
|
{
|
|
int s;
|
|
|
|
s = splbio();
|
|
if(bp->b_vp)
|
|
brelvp(bp);
|
|
splx(s);
|
|
if (!(bp->b_flags & B_INVAL)) { /* B_INVAL indicates a "fake" buffer */
|
|
DOFREE(bp->b_data, M_SEGMENT);
|
|
bp->b_data = NULL;
|
|
}
|
|
DOFREE(bp, M_SEGMENT);
|
|
}
|
|
|
|
/*
|
|
* Definitions for the buffer free lists.
|
|
*/
|
|
#define BQUEUES 4 /* 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 */
|
|
|
|
extern TAILQ_HEAD(bqueues, buf) bufqueues[BQUEUES];
|
|
|
|
/*
|
|
* Return a count of buffers on the "locked" queue.
|
|
* Don't count malloced buffers, since they don't detract from the total.
|
|
*/
|
|
void
|
|
lfs_countlocked(int *count, long *bytes)
|
|
{
|
|
struct buf *bp;
|
|
int n = 0;
|
|
long int size = 0L;
|
|
|
|
for (bp = bufqueues[BQ_LOCKED].tqh_first; bp;
|
|
bp = bp->b_freelist.tqe_next) {
|
|
if (bp->b_flags & B_CALL) /* Malloced buffer */
|
|
continue;
|
|
n++;
|
|
size += bp->b_bufsize;
|
|
#ifdef DEBUG_LOCKED_LIST
|
|
if (n > nbuf)
|
|
panic("lfs_countlocked: this can't happen: more"
|
|
" buffers locked than exist");
|
|
#endif
|
|
}
|
|
#ifdef DEBUG
|
|
/* Theoretically this function never really does anything */
|
|
if (n != *count)
|
|
printf("lfs_countlocked: adjusted buf count from %d to %d\n",
|
|
*count, n);
|
|
if (size != *bytes)
|
|
printf("lfs_countlocked: adjusted byte count from %ld to %ld\n",
|
|
*bytes, size);
|
|
#endif
|
|
*count = n;
|
|
*bytes = size;
|
|
return;
|
|
}
|