/* $NetBSD: lfs_subr.c,v 1.8 1999/03/10 00:20:00 perseant Exp $ */ /*- * Copyright (c) 1999 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Konrad E. Schroder . * * 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 #include #include #include #include #include #include #include #include #include #include #include /* * 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(v) void *v; { struct vop_blkatoff_args /* { struct vnode *a_vp; off_t a_offset; char **a_res; struct buf **a_bpp; } */ *ap = v; 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)) != 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(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); } 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_freebuf(*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. */ while (sync && fs->lfs_iocount) (void)tsleep(&fs->lfs_iocount, PRIBIO + 1, "lfs vflush", 0); splx(s); if (ckp) { fs->lfs_nactive = 0; #ifndef LFS_TOGGLE_SB lfs_writesuper(fs,fs->lfs_sboffs[0]); #else /* 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]); #endif } --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; } }