333 lines
10 KiB
C
333 lines
10 KiB
C
/* $NetBSD: lfs_subr.c,v 1.28 2002/07/11 21:09:00 perseant Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Konrad E. Schroder <perseant@hhhh.org>.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
/*
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)lfs_subr.c 8.4 (Berkeley) 5/8/95
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: lfs_subr.c,v 1.28 2002/07/11 21:09:00 perseant Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/proc.h>
|
|
|
|
#include <ufs/ufs/inode.h>
|
|
#include <ufs/lfs/lfs.h>
|
|
#include <ufs/lfs/lfs_extern.h>
|
|
|
|
/*
|
|
* Return buffer with the contents of block "offset" from the beginning of
|
|
* directory "ip". If "res" is non-zero, fill it in with a pointer to the
|
|
* remaining space in the directory.
|
|
*/
|
|
int
|
|
lfs_blkatoff(void *v)
|
|
{
|
|
struct vop_blkatoff_args /* {
|
|
struct vnode *a_vp;
|
|
off_t a_offset;
|
|
char **a_res;
|
|
struct buf **a_bpp;
|
|
} */ *ap = v;
|
|
struct lfs *fs;
|
|
struct inode *ip;
|
|
struct buf *bp;
|
|
ufs_daddr_t lbn;
|
|
int bsize, error;
|
|
|
|
ip = VTOI(ap->a_vp);
|
|
fs = ip->i_lfs;
|
|
lbn = lblkno(fs, ap->a_offset);
|
|
bsize = blksize(fs, ip, lbn);
|
|
|
|
*ap->a_bpp = NULL;
|
|
if ((error = bread(ap->a_vp, lbn, bsize, NOCRED, &bp)) != 0) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
if (ap->a_res)
|
|
*ap->a_res = (char *)bp->b_data + blkoff(fs, ap->a_offset);
|
|
*ap->a_bpp = bp;
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* lfs_seglock --
|
|
* Single thread the segment writer.
|
|
*/
|
|
void
|
|
lfs_seglock(struct lfs *fs, unsigned long flags)
|
|
{
|
|
struct segment *sp;
|
|
|
|
if (fs->lfs_seglock) {
|
|
if (fs->lfs_lockpid == curproc->p_pid) {
|
|
++fs->lfs_seglock;
|
|
fs->lfs_sp->seg_flags |= flags;
|
|
return;
|
|
} else while (fs->lfs_seglock)
|
|
(void)tsleep(&fs->lfs_seglock, PRIBIO + 1,
|
|
"lfs seglock", 0);
|
|
}
|
|
|
|
fs->lfs_seglock = 1;
|
|
fs->lfs_lockpid = curproc->p_pid;
|
|
|
|
/* Drain fragment size changes out */
|
|
lockmgr(&fs->lfs_fraglock, LK_EXCLUSIVE, 0);
|
|
|
|
sp = fs->lfs_sp = malloc(sizeof(struct segment), M_SEGMENT, M_WAITOK);
|
|
sp->bpp = malloc(((fs->lfs_sumsize - SEGSUM_SIZE(fs)) /
|
|
sizeof(ufs_daddr_t) + 1) * sizeof(struct buf *),
|
|
M_SEGMENT, M_WAITOK);
|
|
sp->seg_flags = flags;
|
|
sp->vp = NULL;
|
|
sp->seg_iocount = 0;
|
|
(void) lfs_initseg(fs);
|
|
|
|
/*
|
|
* Keep a cumulative count of the outstanding I/O operations. If the
|
|
* disk drive catches up with us it could go to zero before we finish,
|
|
* so we artificially increment it by one until we've scheduled all of
|
|
* the writes we intend to do.
|
|
*/
|
|
++fs->lfs_iocount;
|
|
}
|
|
|
|
/*
|
|
* lfs_segunlock --
|
|
* Single thread the segment writer.
|
|
*/
|
|
void
|
|
lfs_segunlock(struct lfs *fs)
|
|
{
|
|
struct segment *sp;
|
|
unsigned long sync, ckp;
|
|
struct buf *bp;
|
|
struct vnode *vp, *nvp;
|
|
struct mount *mp;
|
|
extern int lfs_dirvcount;
|
|
#ifdef LFS_MALLOC_SUMMARY
|
|
extern int locked_queue_count;
|
|
extern long locked_queue_bytes;
|
|
#endif
|
|
|
|
sp = fs->lfs_sp;
|
|
|
|
if (fs->lfs_seglock == 1 && !(sp->seg_flags & SEGM_PROT)) {
|
|
|
|
mp = fs->lfs_ivnode->v_mount;
|
|
/*
|
|
* Go through and unmark all DIROP vnodes, possibly
|
|
* calling VOP_INACTIVE (through vrele). This is
|
|
* delayed until now in order not to accidentally
|
|
* write a DIROP node through lfs_flush.
|
|
*/
|
|
#ifndef LFS_NO_BACKVP_HACK
|
|
/* BEGIN HACK */
|
|
#define VN_OFFSET (((caddr_t)&LIST_NEXT(vp, v_mntvnodes)) - (caddr_t)vp)
|
|
#define BACK_VP(VP) ((struct vnode *)(((caddr_t)(VP)->v_mntvnodes.le_prev) - VN_OFFSET))
|
|
#define BEG_OF_VLIST ((struct vnode *)(((caddr_t)&LIST_FIRST(&mp->mnt_vnodelist)) - VN_OFFSET))
|
|
|
|
/* Find last vnode. */
|
|
loop: for (vp = LIST_FIRST(&mp->mnt_vnodelist);
|
|
vp && LIST_NEXT(vp, v_mntvnodes) != NULL;
|
|
vp = LIST_NEXT(vp, v_mntvnodes));
|
|
for (; vp && vp != BEG_OF_VLIST; vp = nvp) {
|
|
nvp = BACK_VP(vp);
|
|
#else
|
|
loop:
|
|
for (vp = LIST_FIRST(&mp->mnt_vnodelist);
|
|
vp != NULL;
|
|
vp = nvp) {
|
|
nvp = LIST_NEXT(vp, v_mntvnodes);
|
|
#endif
|
|
if (vp->v_mount != mp) {
|
|
printf("lfs_segunlock: starting over\n");
|
|
goto loop;
|
|
}
|
|
if (vp->v_type == VNON)
|
|
continue;
|
|
if (lfs_vref(vp))
|
|
continue;
|
|
if (VOP_ISLOCKED(vp) &&
|
|
vp->v_lock.lk_lockholder != curproc->p_pid) {
|
|
lfs_vunref(vp);
|
|
continue;
|
|
}
|
|
if ((vp->v_flag & VDIROP) &&
|
|
!(VTOI(vp)->i_flag & IN_ADIROP)) {
|
|
--lfs_dirvcount;
|
|
vp->v_flag &= ~VDIROP;
|
|
wakeup(&lfs_dirvcount);
|
|
fs->lfs_unlockvp = vp;
|
|
lfs_vunref(vp);
|
|
vrele(vp);
|
|
fs->lfs_unlockvp = NULL;
|
|
} else {
|
|
lfs_vunref(vp);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (fs->lfs_seglock == 1) {
|
|
sync = sp->seg_flags & SEGM_SYNC;
|
|
ckp = sp->seg_flags & SEGM_CKP;
|
|
if (sp->bpp != sp->cbpp) {
|
|
/* Free allocated segment summary */
|
|
fs->lfs_offset -= btofsb(fs, fs->lfs_sumsize);
|
|
bp = *sp->bpp;
|
|
#ifdef LFS_MALLOC_SUMMARY
|
|
lfs_freebuf(bp);
|
|
#else
|
|
s = splbio();
|
|
bremfree(bp);
|
|
bp->b_flags |= B_DONE|B_INVAL;
|
|
bp->b_flags &= ~B_DELWRI;
|
|
reassignbuf(bp,bp->b_vp);
|
|
splx(s);
|
|
brelse(bp);
|
|
#endif
|
|
} else
|
|
printf ("unlock to 0 with no summary");
|
|
|
|
free(sp->bpp, M_SEGMENT);
|
|
sp->bpp = NULL;
|
|
/* The sync case holds a reference in `sp' to be freed below */
|
|
if (!sync)
|
|
free(sp, M_SEGMENT);
|
|
fs->lfs_sp = NULL;
|
|
|
|
/*
|
|
* If the I/O count is non-zero, sleep until it reaches zero.
|
|
* At the moment, the user's process hangs around so we can
|
|
* sleep.
|
|
*/
|
|
if (--fs->lfs_iocount < LFS_THROTTLE)
|
|
wakeup(&fs->lfs_iocount);
|
|
if(fs->lfs_iocount == 0) {
|
|
lfs_countlocked(&locked_queue_count,
|
|
&locked_queue_bytes, "lfs_segunlock");
|
|
wakeup(&locked_queue_count);
|
|
wakeup(&fs->lfs_iocount);
|
|
}
|
|
/*
|
|
* If we're not checkpointing, we don't have to block
|
|
* other processes to wait for a synchronous write
|
|
* to complete.
|
|
*/
|
|
if (!ckp) {
|
|
--fs->lfs_seglock;
|
|
fs->lfs_lockpid = 0;
|
|
wakeup(&fs->lfs_seglock);
|
|
}
|
|
/*
|
|
* We let checkpoints happen asynchronously. That means
|
|
* that during recovery, we have to roll forward between
|
|
* the two segments described by the first and second
|
|
* superblocks to make sure that the checkpoint described
|
|
* by a superblock completed.
|
|
*/
|
|
while (ckp && sync && fs->lfs_iocount)
|
|
(void)tsleep(&fs->lfs_iocount, PRIBIO + 1,
|
|
"lfs_iocount", 0);
|
|
while (sync && sp->seg_iocount) {
|
|
(void)tsleep(&sp->seg_iocount, PRIBIO + 1,
|
|
"seg_iocount", 0);
|
|
/* printf("sleeping on iocount %x == %d\n", sp, sp->seg_iocount); */
|
|
}
|
|
if (sync)
|
|
free(sp, M_SEGMENT);
|
|
if (ckp) {
|
|
fs->lfs_nactive = 0;
|
|
/* If we *know* everything's on disk, write both sbs */
|
|
if (sync)
|
|
lfs_writesuper(fs,fs->lfs_sboffs[fs->lfs_activesb]);
|
|
fs->lfs_activesb = 1 - fs->lfs_activesb;
|
|
lfs_writesuper(fs,fs->lfs_sboffs[fs->lfs_activesb]);
|
|
|
|
--fs->lfs_seglock;
|
|
fs->lfs_lockpid = 0;
|
|
wakeup(&fs->lfs_seglock);
|
|
}
|
|
/* Reenable fragment size changes */
|
|
lockmgr(&fs->lfs_fraglock, LK_RELEASE, 0);
|
|
} else if (fs->lfs_seglock == 0) {
|
|
panic ("Seglock not held");
|
|
} else {
|
|
--fs->lfs_seglock;
|
|
}
|
|
}
|