mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
6875d25465
ready for it yet.
188 lines
5.3 KiB
C
188 lines
5.3 KiB
C
/*
|
|
* 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
|
|
* $Id$
|
|
*/
|
|
|
|
#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/quota.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(ap)
|
|
struct vop_blkatoff_args /* {
|
|
struct vnode *a_vp;
|
|
off_t a_offset;
|
|
char **a_res;
|
|
struct buf **a_bpp;
|
|
} */ *ap;
|
|
{
|
|
register 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)) {
|
|
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(fs, flags)
|
|
struct lfs *fs;
|
|
unsigned long flags;
|
|
{
|
|
struct segment *sp;
|
|
int s;
|
|
|
|
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);
|
|
|
|
/* XXX RACE CONDITION????? */
|
|
fs->lfs_seglock = 1;
|
|
fs->lfs_lockpid = curproc->p_pid;
|
|
|
|
sp = fs->lfs_sp = malloc(sizeof(struct segment), M_SEGMENT, M_WAITOK);
|
|
sp->bpp = malloc(((LFS_SUMMARY_SIZE - sizeof(SEGSUM)) /
|
|
sizeof(ufs_daddr_t) + 1) * sizeof(struct buf *),
|
|
M_SEGMENT, M_WAITOK);
|
|
sp->seg_flags = flags;
|
|
sp->vp = NULL;
|
|
(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.
|
|
*/
|
|
s = splbio();
|
|
++fs->lfs_iocount;
|
|
splx(s);
|
|
}
|
|
/*
|
|
* lfs_segunlock --
|
|
* Single thread the segment writer.
|
|
*/
|
|
void
|
|
lfs_segunlock(fs)
|
|
struct lfs *fs;
|
|
{
|
|
struct segment *sp;
|
|
unsigned long sync, ckp;
|
|
int s;
|
|
|
|
if (fs->lfs_seglock == 1) {
|
|
|
|
sp = fs->lfs_sp;
|
|
sync = sp->seg_flags & SEGM_SYNC;
|
|
ckp = sp->seg_flags & SEGM_CKP;
|
|
if (sp->bpp != sp->cbpp) {
|
|
/* Free allocated segment summary */
|
|
fs->lfs_offset -= LFS_SUMMARY_SIZE / DEV_BSIZE;
|
|
lfs_free_buffer((*sp->bpp)->b_data, roundup((*sp->bpp)->b_bufsize, DEV_BSIZE));
|
|
relpbuf(*sp->bpp);
|
|
} else
|
|
printf ("unlock to 0 with no summary");
|
|
free(sp->bpp, M_SEGMENT);
|
|
free(sp, M_SEGMENT);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
s = splbio();
|
|
--fs->lfs_iocount;
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (sync && fs->lfs_iocount)
|
|
(void)tsleep(&fs->lfs_iocount, PRIBIO + 1, "lfs vflush", 0);
|
|
splx(s);
|
|
if (ckp) {
|
|
fs->lfs_nactive = 0;
|
|
lfs_writesuper(fs);
|
|
}
|
|
--fs->lfs_seglock;
|
|
fs->lfs_lockpid = 0;
|
|
wakeup(&fs->lfs_seglock);
|
|
} else if (fs->lfs_seglock == 0) {
|
|
panic ("Seglock not held");
|
|
} else {
|
|
--fs->lfs_seglock;
|
|
}
|
|
}
|