/* $NetBSD: ext2fs_inode.c,v 1.32 2003/04/02 22:38:22 he Exp $ */ /* * Copyright (c) 1997 Manuel Bouyer. * Copyright (c) 1982, 1986, 1989, 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. * * @(#)ffs_inode.c 8.8 (Berkeley) 10/19/94 * Modified for ext2fs by Manuel Bouyer. */ #include __KERNEL_RCSID(0, "$NetBSD: ext2fs_inode.c,v 1.32 2003/04/02 22:38:22 he Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern int prtactive; static int ext2fs_indirtrunc __P((struct inode *, daddr_t, daddr_t, daddr_t, int, long *)); /* * Last reference to an inode. If necessary, write or delete it. */ int ext2fs_inactive(v) void *v; { struct vop_inactive_args /* { struct vnode *a_vp; struct proc *a_p; } */ *ap = v; struct vnode *vp = ap->a_vp; struct inode *ip = VTOI(vp); struct proc *p = ap->a_p; struct timespec ts; int error = 0; if (prtactive && vp->v_usecount != 0) vprint("ext2fs_inactive: pushing active", vp); /* Get rid of inodes related to stale file handles. */ if (ip->i_e2fs_mode == 0 || ip->i_e2fs_dtime != 0) goto out; error = 0; if (ip->i_e2fs_nlink == 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { if (ip->i_e2fs_size != 0) { error = VOP_TRUNCATE(vp, (off_t)0, 0, NOCRED, NULL); } TIMEVAL_TO_TIMESPEC(&time, &ts); ip->i_e2fs_dtime = ts.tv_sec; ip->i_flag |= IN_CHANGE | IN_UPDATE; VOP_VFREE(vp, ip->i_number, ip->i_e2fs_mode); } if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE | IN_MODIFIED | IN_ACCESSED)) VOP_UPDATE(vp, NULL, NULL, 0); out: VOP_UNLOCK(vp, 0); /* * If we are done with the inode, reclaim it * so that it can be reused immediately. */ if (ip->i_e2fs_dtime != 0) vrecycle(vp, NULL, p); return (error); } /* * Update the access, modified, and inode change times as specified by the * IACCESS, IUPDATE, and ICHANGE flags respectively. The IMODIFIED flag is * used to specify that the inode needs to be updated but that the times have * already been set. The access and modified times are taken from the second * and third parameters; the inode change time is always taken from the current * time. If UPDATE_WAIT or UPDATE_DIROP is set, then wait for the disk * write of the inode to complete. */ int ext2fs_update(v) void *v; { struct vop_update_args /* { struct vnode *a_vp; struct timespec *a_access; struct timespec *a_modify; int a_flags; } */ *ap = v; struct m_ext2fs *fs; struct buf *bp; struct inode *ip; int error; struct timespec ts; caddr_t cp; int flags; if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY) return (0); ip = VTOI(ap->a_vp); TIMEVAL_TO_TIMESPEC(&time, &ts); EXT2FS_ITIMES(ip, ap->a_access ? ap->a_access : &ts, ap->a_modify ? ap->a_modify : &ts, &ts); flags = ip->i_flag & (IN_MODIFIED | IN_ACCESSED); if (flags == 0) return (0); fs = ip->i_e2fs; error = bread(ip->i_devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), (int)fs->e2fs_bsize, NOCRED, &bp); if (error) { brelse(bp); return (error); } ip->i_flag &= ~(IN_MODIFIED | IN_ACCESSED); cp = (caddr_t)bp->b_data + (ino_to_fsbo(fs, ip->i_number) * EXT2_DINODE_SIZE); e2fs_isave(ip->i_din.e2fs_din, (struct ext2fs_dinode *)cp); if ((ap->a_flags & (UPDATE_WAIT|UPDATE_DIROP)) != 0 && (flags & IN_MODIFIED) != 0 && (ap->a_vp->v_mount->mnt_flag & MNT_ASYNC) == 0) return (bwrite(bp)); else { bdwrite(bp); return (0); } } #define SINGLE 0 /* index of single indirect block */ #define DOUBLE 1 /* index of double indirect block */ #define TRIPLE 2 /* index of triple indirect block */ /* * Truncate the inode oip to at most length size, freeing the * disk blocks. */ int ext2fs_truncate(v) void *v; { struct vop_truncate_args /* { struct vnode *a_vp; off_t a_length; int a_flags; struct ucred *a_cred; struct proc *a_p; } */ *ap = v; struct vnode *ovp = ap->a_vp; daddr_t lastblock; struct inode *oip; daddr_t bn, lastiblock[NIADDR], indir_lbn[NIADDR]; /* XXX ondisk32 */ int32_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR]; off_t length = ap->a_length; struct m_ext2fs *fs; int offset, size, level; long count, nblocks, blocksreleased = 0; int i; int error, allerror = 0; off_t osize; if (length < 0) return (EINVAL); oip = VTOI(ovp); if (ovp->v_type == VLNK && (oip->i_e2fs_size < ovp->v_mount->mnt_maxsymlinklen || (ovp->v_mount->mnt_maxsymlinklen == 0 && oip->i_e2fs_nblock == 0))) { #ifdef DIAGNOSTIC if (length != 0) panic("ext2fs_truncate: partial truncate of symlink"); #endif memset((char *)&oip->i_din.e2fs_din->e2di_shortlink, 0, (u_int)oip->i_e2fs_size); oip->i_e2fs_size = 0; oip->i_flag |= IN_CHANGE | IN_UPDATE; return (VOP_UPDATE(ovp, NULL, NULL, UPDATE_WAIT)); } if (oip->i_e2fs_size == length) { oip->i_flag |= IN_CHANGE | IN_UPDATE; return (VOP_UPDATE(ovp, NULL, NULL, 0)); } fs = oip->i_e2fs; osize = oip->i_e2fs_size; /* * Lengthen the size of the file. We must ensure that the * last byte of the file is allocated. Since the smallest * value of osize is 0, length will be at least 1. */ if (osize < length) { #if 0 /* XXX */ if (length > fs->fs_maxfilesize) return (EFBIG); #endif ufs_balloc_range(ovp, length - 1, 1, ap->a_cred, ap->a_flags & IO_SYNC ? B_SYNC : 0); oip->i_flag |= IN_CHANGE | IN_UPDATE; return (VOP_UPDATE(ovp, NULL, NULL, 1)); } /* * Shorten 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 accessible again because * of subsequent file growth. */ offset = blkoff(fs, length); if (offset != 0) { size = fs->e2fs_bsize; /* XXXUBC we should handle more than just VREG */ uvm_vnp_zerorange(ovp, length, size - offset); } oip->i_e2fs_size = length; uvm_vnp_setsize(ovp, length); /* * Calculate index into inode's block list of * last direct and indirect blocks (if any) * which we want to keep. Lastblock is -1 when * the file is truncated to 0. */ lastblock = lblkno(fs, length + fs->e2fs_bsize - 1) - 1; lastiblock[SINGLE] = lastblock - NDADDR; lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs); lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs); nblocks = btodb(fs->e2fs_bsize); /* * Update file and block pointers on disk before we start freeing * blocks. If we crash before free'ing blocks below, the blocks * will be returned to the free list. lastiblock values are also * normalized to -1 for calls to ext2fs_indirtrunc below. */ memcpy((caddr_t)oldblks, (caddr_t)&oip->i_e2fs_blocks[0], sizeof oldblks); for (level = TRIPLE; level >= SINGLE; level--) if (lastiblock[level] < 0) { oip->i_e2fs_blocks[NDADDR + level] = 0; lastiblock[level] = -1; } for (i = NDADDR - 1; i > lastblock; i--) oip->i_e2fs_blocks[i] = 0; oip->i_flag |= IN_CHANGE | IN_UPDATE; error = VOP_UPDATE(ovp, NULL, NULL, UPDATE_WAIT); if (error && !allerror) allerror = error; /* * Having written the new inode to disk, save its new configuration * and put back the old block pointers long enough to process them. * Note that we save the new block configuration so we can check it * when we are done. */ memcpy((caddr_t)newblks, (caddr_t)&oip->i_e2fs_blocks[0], sizeof newblks); memcpy((caddr_t)&oip->i_e2fs_blocks[0], (caddr_t)oldblks, sizeof oldblks); oip->i_e2fs_size = osize; error = vtruncbuf(ovp, lastblock + 1, 0, 0); if (error && !allerror) allerror = error; /* * Indirect blocks first. */ indir_lbn[SINGLE] = -NDADDR; indir_lbn[DOUBLE] = indir_lbn[SINGLE] - NINDIR(fs) -1; indir_lbn[TRIPLE] = indir_lbn[DOUBLE] - NINDIR(fs) * NINDIR(fs) - 1; for (level = TRIPLE; level >= SINGLE; level--) { /* XXX ondisk32 */ bn = fs2h32(oip->i_e2fs_blocks[NDADDR + level]); if (bn != 0) { error = ext2fs_indirtrunc(oip, indir_lbn[level], fsbtodb(fs, bn), lastiblock[level], level, &count); if (error) allerror = error; blocksreleased += count; if (lastiblock[level] < 0) { oip->i_e2fs_blocks[NDADDR + level] = 0; ext2fs_blkfree(oip, bn); blocksreleased += nblocks; } } if (lastiblock[level] >= 0) goto done; } /* * All whole direct blocks or frags. */ for (i = NDADDR - 1; i > lastblock; i--) { /* XXX ondisk32 */ bn = fs2h32(oip->i_e2fs_blocks[i]); if (bn == 0) continue; oip->i_e2fs_blocks[i] = 0; ext2fs_blkfree(oip, bn); blocksreleased += btodb(fs->e2fs_bsize); } done: #ifdef DIAGNOSTIC for (level = SINGLE; level <= TRIPLE; level++) if (newblks[NDADDR + level] != oip->i_e2fs_blocks[NDADDR + level]) panic("ext2fs_truncate1"); for (i = 0; i < NDADDR; i++) if (newblks[i] != oip->i_e2fs_blocks[i]) panic("ext2fs_truncate2"); if (length == 0 && (!LIST_EMPTY(&ovp->v_cleanblkhd) || !LIST_EMPTY(&ovp->v_dirtyblkhd))) panic("ext2fs_truncate3"); #endif /* DIAGNOSTIC */ /* * Put back the real size. */ oip->i_e2fs_size = length; oip->i_e2fs_nblock -= blocksreleased; oip->i_flag |= IN_CHANGE; return (allerror); } /* * Release blocks associated with the inode ip and stored in the indirect * block bn. Blocks are free'd in LIFO order up to (but not including) * lastbn. If level is greater than SINGLE, the block is an indirect block * and recursive calls to indirtrunc must be used to cleanse other indirect * blocks. * * NB: triple indirect blocks are untested. */ static int ext2fs_indirtrunc(ip, lbn, dbn, lastbn, level, countp) struct inode *ip; daddr_t lbn, lastbn; daddr_t dbn; int level; long *countp; { int i; struct buf *bp; struct m_ext2fs *fs = ip->i_e2fs; int32_t *bap; /* XXX ondisk32 */ struct vnode *vp; daddr_t nb, nlbn, last; int32_t *copy = NULL; /* XXX ondisk32 */ long blkcount, factor; int nblocks, blocksreleased = 0; int error = 0, allerror = 0; /* * Calculate index in current block of last * block to be kept. -1 indicates the entire * block so we need not calculate the index. */ factor = 1; for (i = SINGLE; i < level; i++) factor *= NINDIR(fs); last = lastbn; if (lastbn > 0) last /= factor; nblocks = btodb(fs->e2fs_bsize); /* * Get buffer of block pointers, zero those entries corresponding * to blocks to be free'd, and update on disk copy first. Since * double(triple) indirect before single(double) indirect, calls * to bmap on these blocks will fail. However, we already have * the on disk address, so we have to set the b_blkno field * explicitly instead of letting bread do everything for us. */ vp = ITOV(ip); bp = getblk(vp, lbn, (int)fs->e2fs_bsize, 0, 0); if (bp->b_flags & (B_DONE | B_DELWRI)) { /* Braces must be here in case trace evaluates to nothing. */ trace(TR_BREADHIT, pack(vp, fs->e2fs_bsize), lbn); } else { trace(TR_BREADMISS, pack(vp, fs->e2fs_bsize), lbn); curproc->p_stats->p_ru.ru_inblock++; /* pay for read */ bp->b_flags |= B_READ; if (bp->b_bcount > bp->b_bufsize) panic("ext2fs_indirtrunc: bad buffer size"); bp->b_blkno = dbn; VOP_STRATEGY(bp); error = biowait(bp); } if (error) { brelse(bp); *countp = 0; return (error); } bap = (int32_t *)bp->b_data; /* XXX ondisk32 */ if (lastbn >= 0) { /* XXX ondisk32 */ MALLOC(copy, int32_t *, fs->e2fs_bsize, M_TEMP, M_WAITOK); memcpy((caddr_t)copy, (caddr_t)bap, (u_int)fs->e2fs_bsize); memset((caddr_t)&bap[last + 1], 0, (u_int)(NINDIR(fs) - (last + 1)) * sizeof (u_int32_t)); error = bwrite(bp); if (error) allerror = error; bap = copy; } /* * Recursively free totally unused blocks. */ for (i = NINDIR(fs) - 1, nlbn = lbn + 1 - i * factor; i > last; i--, nlbn += factor) { /* XXX ondisk32 */ nb = fs2h32(bap[i]); if (nb == 0) continue; if (level > SINGLE) { error = ext2fs_indirtrunc(ip, nlbn, fsbtodb(fs, nb), (daddr_t)-1, level - 1, &blkcount); if (error) allerror = error; blocksreleased += blkcount; } ext2fs_blkfree(ip, nb); blocksreleased += nblocks; } /* * Recursively free last partial block. */ if (level > SINGLE && lastbn >= 0) { last = lastbn % factor; /* XXX ondisk32 */ nb = fs2h32(bap[i]); if (nb != 0) { error = ext2fs_indirtrunc(ip, nlbn, fsbtodb(fs, nb), last, level - 1, &blkcount); if (error) allerror = error; blocksreleased += blkcount; } } if (copy != NULL) { FREE(copy, M_TEMP); } else { bp->b_flags |= B_INVAL; brelse(bp); } *countp = blocksreleased; return (allerror); }