/* * Copyright (c) 1986, 1989, 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_inode.c 8.5 (Berkeley) 12/30/93 * $Id: lfs_inode.c,v 1.7 1995/03/19 14:29:17 davidg Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int lfs_init() { return (ufs_init()); } /* Search a block for a specific dinode. */ struct dinode * lfs_ifind(fs, ino, dip) struct lfs *fs; ino_t ino; register struct dinode *dip; { register int cnt; register struct dinode *ldip; for (cnt = INOPB(fs), ldip = dip + (cnt - 1); cnt--; --ldip) if (ldip->di_inumber == ino) return (ldip); panic("lfs_ifind: dinode %u not found", ino); /* NOTREACHED */ } int lfs_update(ap) struct vop_update_args /* { struct vnode *a_vp; struct timeval *a_access; struct timeval *a_modify; int a_waitfor; } */ *ap; { struct vnode *vp = ap->a_vp; struct inode *ip; int error; if (vp->v_mount->mnt_flag & MNT_RDONLY){ return (0); } ip = VTOI(vp); /* XXX * We used to just return here. Now we make sure to check if * we were called by lfs_fsync, since in this case, the inode * may have been written to disk without all buffers connected * with the vnode being flushed. It seems really suspicious * that this could happen since from what I understand of the * intended semantics, one of these flags should be set if there * are still dirty buffers. Compare to how ffs_fsync/ffs_update * work together and you'll see what I mean. */ if (((ip->i_flag & (IN_ACCESS|IN_CHANGE|IN_MODIFIED|IN_UPDATE)) == 0) && (vp->v_dirtyblkhd.lh_first == NULL)) return(0); if (ip->i_flag & IN_ACCESS) ip->i_atime.ts_sec = ap->a_access->tv_sec; if (ip->i_flag & IN_UPDATE) { ip->i_mtime.ts_sec = ap->a_modify->tv_sec; (ip)->i_modrev++; } if (ip->i_flag & IN_CHANGE) ip->i_ctime.ts_sec = time.tv_sec; ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE); if (!(ip->i_flag & IN_MODIFIED)) ++(VFSTOUFS(vp->v_mount)->um_lfs->lfs_uinodes); ip->i_flag |= IN_MODIFIED; /* If sync, push back the vnode and any dirty blocks it may have. */ error = (ap->a_waitfor & LFS_SYNC ? lfs_vflush(vp) : 0); if(ap->a_waitfor & LFS_SYNC && vp->v_dirtyblkhd.lh_first != NULL) panic("lfs_update: dirty bufs"); return( error ); } /* Update segment usage information when removing a block. */ #define UPDATE_SEGUSE \ if (lastseg != -1) { \ LFS_SEGENTRY(sup, fs, lastseg, sup_bp); \ if ((num << fs->lfs_bshift) > sup->su_nbytes) \ panic("lfs_truncate: negative bytes in segment %d", \ lastseg); \ sup->su_nbytes -= num << fs->lfs_bshift; \ e1 = VOP_BWRITE(sup_bp); \ blocksreleased += num; \ } #define SEGDEC { \ if (daddr != 0) { \ if (lastseg != (seg = datosn(fs, daddr))) { \ UPDATE_SEGUSE; \ num = 1; \ lastseg = seg; \ } else \ ++num; \ } \ } /* * Truncate the inode ip to at most length size. Update segment usage * table information. */ /* ARGSUSED */ int lfs_truncate(ap) struct vop_truncate_args /* { struct vnode *a_vp; off_t a_length; int a_flags; struct ucred *a_cred; struct proc *a_p; } */ *ap; { register struct indir *inp; register int i; register daddr_t *daddrp; register struct vnode *vp = ap->a_vp; off_t length = ap->a_length; struct buf *bp, *sup_bp; struct timeval tv; struct ifile *ifp; struct inode *ip; struct lfs *fs; struct indir a[NIADDR + 2], a_end[NIADDR + 2]; SEGUSE *sup; daddr_t daddr, lastblock, lbn, olastblock; long off, a_released, blocksreleased, i_released; int e1, e2, depth, lastseg, num, offset, seg, size; ip = VTOI(vp); tv = time; if (vp->v_type == VLNK && vp->v_mount->mnt_maxsymlinklen > 0) { #ifdef DIAGNOSTIC if (length != 0) panic("lfs_truncate: partial truncate of symlink"); #endif bzero((char *)&ip->i_shortlink, (u_int)ip->i_size); ip->i_size = 0; ip->i_flag |= IN_CHANGE | IN_UPDATE; return (VOP_UPDATE(vp, &tv, &tv, 0)); } vnode_pager_setsize(vp, (u_long)length); fs = ip->i_lfs; /* If length is larger than the file, just update the times. */ if (ip->i_size <= length) { ip->i_flag |= IN_CHANGE | IN_UPDATE; return (VOP_UPDATE(vp, &tv, &tv, 0)); } /* * Calculate index into inode's block list of last direct and indirect * blocks (if any) which we want to keep. Lastblock is 0 when the * file is truncated to 0. */ lastblock = lblkno(fs, length + fs->lfs_bsize - 1); olastblock = lblkno(fs, ip->i_size + fs->lfs_bsize - 1) - 1; /* * Update the size of the file. If the file is not being truncated to * a block boundry, the contents of the partial block following the end * of the file must be zero'ed in case it ever become accessable again * because of subsequent file growth. */ offset = blkoff(fs, length); if (offset == 0) ip->i_size = length; else { lbn = lblkno(fs, length); #ifdef QUOTA if (e1 = getinoquota(ip)) return (e1); #endif if (e1 = bread(vp, lbn, fs->lfs_bsize, NOCRED, &bp)) return (e1); ip->i_size = length; size = blksize(fs); bzero((char *)bp->b_data + offset, (u_int)(size - offset)); allocbuf(bp, size); if (e1 = VOP_BWRITE(bp)) return (e1); } /* * Modify sup->su_nbyte counters for each deleted block; keep track * of number of blocks removed for ip->i_blocks. */ blocksreleased = 0; num = 0; lastseg = -1; for (lbn = olastblock; lbn >= lastblock;) { /* XXX use run length from bmap array to make this faster */ ufs_bmaparray(vp, lbn, &daddr, a, &depth, NULL); if (lbn == olastblock) for (i = NIADDR + 2; i--;) a_end[i] = a[i]; switch (depth) { case 0: /* Direct block. */ daddr = ip->i_db[lbn]; SEGDEC; ip->i_db[lbn] = 0; --lbn; break; #ifdef DIAGNOSTIC case 1: /* An indirect block. */ panic("lfs_truncate: ufs_bmaparray returned depth 1"); /* NOTREACHED */ #endif default: /* Chain of indirect blocks. */ inp = a + --depth; if (inp->in_off > 0 && lbn != lastblock) { lbn -= inp->in_off < lbn - lastblock ? inp->in_off : lbn - lastblock; break; } for (; depth && (inp->in_off == 0 || lbn == lastblock); --inp, --depth) { if (bread(vp, inp->in_lbn, fs->lfs_bsize, NOCRED, &bp)) panic("lfs_truncate: bread bno %d", inp->in_lbn); daddrp = (daddr_t *)bp->b_data + inp->in_off; for (i = inp->in_off; i++ <= a_end[depth].in_off;) { daddr = *daddrp++; SEGDEC; } a_end[depth].in_off = NINDIR(fs) - 1; if (inp->in_off == 0) brelse (bp); else { bzero((daddr_t *)bp->b_data + inp->in_off, fs->lfs_bsize - inp->in_off * sizeof(daddr_t)); if (e1 = VOP_BWRITE(bp)) return (e1); } } if (depth == 0 && a[1].in_off == 0) { off = a[0].in_off; daddr = ip->i_ib[off]; SEGDEC; ip->i_ib[off] = 0; } if (lbn == lastblock || lbn <= NDADDR) --lbn; else { lbn -= NINDIR(fs); if (lbn < lastblock) lbn = lastblock; } } } UPDATE_SEGUSE; /* If truncating the file to 0, update the version number. */ if (length == 0) { LFS_IENTRY(ifp, fs, ip->i_number, bp); ++ifp->if_version; (void) VOP_BWRITE(bp); } #ifdef DIAGNOSTIC if (ip->i_blocks < fsbtodb(fs, blocksreleased)) { printf("lfs_truncate: block count < 0\n"); blocksreleased = ip->i_blocks; } #endif ip->i_blocks -= fsbtodb(fs, blocksreleased); fs->lfs_bfree += fsbtodb(fs, blocksreleased); ip->i_flag |= IN_CHANGE | IN_UPDATE; /* * Traverse dirty block list counting number of dirty buffers * that are being deleted out of the cache, so that the lfs_avail * field can be updated. */ a_released = 0; i_released = 0; for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = bp->b_vnbufs.le_next) if (bp->b_flags & B_LOCKED) { ++a_released; /* * XXX * When buffers are created in the cache, their block * number is set equal to their logical block number. * If that is still true, we are assuming that the * blocks are new (not yet on disk) and weren't * counted above. However, there is a slight chance * that a block's disk address is equal to its logical * block number in which case, we'll get an overcounting * here. */ if (bp->b_blkno == bp->b_lblkno) ++i_released; } blocksreleased = fsbtodb(fs, i_released); #ifdef DIAGNOSTIC if (blocksreleased > ip->i_blocks) { printf("lfs_inode: Warning! %s\n", "more blocks released from inode than are in inode"); blocksreleased = ip->i_blocks; } #endif fs->lfs_bfree += blocksreleased; ip->i_blocks -= blocksreleased; #ifdef DIAGNOSTIC if (length == 0 && ip->i_blocks != 0) printf("lfs_inode: Warning! %s%ld%s\n", "Truncation to zero, but ", ip->i_blocks, " blocks left on inode"); #endif fs->lfs_avail += fsbtodb(fs, a_released); e1 = vinvalbuf(vp, (length > 0) ? V_SAVE : 0, ap->a_cred, ap->a_p, 0, 0); e2 = VOP_UPDATE(vp, &tv, &tv, 0); return (e1 ? e1 : e2 ? e2 : 0); }