/* $OpenBSD: ext2fs_inode.c,v 1.64 2021/03/11 13:31:35 jsg Exp $ */ /* $NetBSD: ext2fs_inode.c,v 1.24 2001/06/19 12:59:18 wiz 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. 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int ext2fs_indirtrunc(struct inode *, int32_t, int32_t, int32_t, int, long *); /* * Get the size of an inode. */ u_int64_t ext2fs_size(struct inode *ip) { u_int64_t size = ip->i_e2fs_size; if ((ip->i_e2fs_mode & IFMT) == IFREG) size |= (u_int64_t)ip->i_e2fs_size_hi << 32; return (size); } int ext2fs_setsize(struct inode *ip, u_int64_t size) { struct m_ext2fs *fs = ip->i_e2fs; if (size <= fs->e2fs_maxfilesize) { /* If HUGE_FILEs are off, e2fs_maxfilesize will protect us. */ if ((ip->i_e2fs_mode & IFMT) == IFREG || ip->i_e2fs_mode == 0) ip->i_e2fs_size_hi = size >> 32; ip->i_e2fs_size = size; return (0); } /* Linux automagically upgrades to REV1 here! */ if (fs->e2fs.e2fs_rev <= E2FS_REV0) return (EFBIG); if (!(fs->e2fs.e2fs_features_rocompat & EXT2F_ROCOMPAT_LARGE_FILE)) { fs->e2fs.e2fs_features_rocompat |= EXT2F_ROCOMPAT_LARGE_FILE; fs->e2fs_fmod = 1; } return (EFBIG); } /* * Last reference to an inode. If necessary, write or delete it. */ int ext2fs_inactive(void *v) { struct vop_inactive_args *ap = v; struct vnode *vp = ap->a_vp; struct inode *ip = VTOI(vp); struct timespec ts; int error = 0; #ifdef DIAGNOSTIC extern int prtactive; if (prtactive && vp->v_usecount != 0) vprint("ext2fs_inactive: pushing active", vp); #endif /* Get rid of inodes related to stale file handles. */ if (ip->i_e2din == NULL || ip->i_e2fs_mode == 0 || ip->i_e2fs_dtime) goto out; error = 0; if (ip->i_e2fs_nlink == 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { if (ext2fs_size(ip) != 0) { error = ext2fs_truncate(ip, (off_t)0, 0, NOCRED); } getnanotime(&ts); ip->i_e2fs_dtime = ts.tv_sec; ip->i_flag |= IN_CHANGE | IN_UPDATE; ext2fs_inode_free(ip, ip->i_number, ip->i_e2fs_mode); } if (ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_MODIFIED | IN_UPDATE)) { ext2fs_update(ip, 0); } out: VOP_UNLOCK(vp); /* * If we are done with the inode, reclaim it * so that it can be reused immediately. */ if (ip->i_e2din == NULL || ip->i_e2fs_dtime != 0) vrecycle(vp, ap->a_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 waitfor is set, then wait for the disk write of the inode to * complete. */ int ext2fs_update(struct inode *ip, int waitfor) { struct m_ext2fs *fs; struct buf *bp; int error; caddr_t cp; if (ITOV(ip)->v_mount->mnt_flag & MNT_RDONLY) return (0); EXT2FS_ITIMES(ip); if ((ip->i_flag & IN_MODIFIED) == 0) return (0); ip->i_flag &= ~IN_MODIFIED; fs = ip->i_e2fs; error = bread(ip->i_devvp, fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), (int)fs->e2fs_bsize, &bp); if (error) { brelse(bp); return (error); } ip->i_flag &= ~(IN_MODIFIED); cp = (caddr_t)bp->b_data + (ino_to_fsbo(fs, ip->i_number) * EXT2_DINODE_SIZE(fs)); /* * See note about 16-bit UID/GID limitation in ext2fs_vget(). Now * that we are about to write the inode, construct the split UID and * GID fields out of the two 32-bit fields we kept in memory. */ ip->i_e2fs_uid_low = (u_int16_t)ip->i_e2fs_uid; ip->i_e2fs_gid_low = (u_int16_t)ip->i_e2fs_gid; ip->i_e2fs_uid_high = ip->i_e2fs_uid >> 16; ip->i_e2fs_gid_high = ip->i_e2fs_gid >> 16; e2fs_isave(fs, ip->i_e2din, (struct ext2fs_dinode *)cp); if (waitfor) 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(struct inode *oip, off_t length, int flags, struct ucred *cred) { struct vnode *ovp = ITOV(oip); int32_t lastblock; int32_t bn, lbn, lastiblock[NIADDR], indir_lbn[NIADDR]; int32_t oldblks[NDADDR + NIADDR], newblks[NDADDR + NIADDR]; struct m_ext2fs *fs; struct buf *bp; int offset, size, level; long count, nblocks, vflags, blocksreleased = 0; int i; int aflags, error, allerror; off_t osize; if (length < 0) return (EINVAL); if (ovp->v_type != VREG && ovp->v_type != VDIR && ovp->v_type != VLNK) return (0); if (ovp->v_type == VLNK && ext2fs_size(oip) < EXT2_MAXSYMLINKLEN) { #ifdef DIAGNOSTIC if (length != 0) panic("ext2fs_truncate: partial truncate of symlink"); #endif memset(&oip->i_e2din->e2di_shortlink, 0, ext2fs_size(oip)); (void)ext2fs_setsize(oip, 0); oip->i_flag |= IN_CHANGE | IN_UPDATE; return (ext2fs_update(oip, 1)); } if (ext2fs_size(oip) == length) { oip->i_flag |= IN_CHANGE | IN_UPDATE; return (ext2fs_update(oip, 0)); } fs = oip->i_e2fs; osize = ext2fs_size(oip); /* * 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 offset = blkoff(fs, length - 1); lbn = lblkno(fs, length - 1); aflags = B_CLRBUF; if (flags & IO_SYNC) aflags |= B_SYNC; error = ext2fs_buf_alloc(oip, lbn, offset + 1, cred, &bp, aflags); if (error) return (error); (void)ext2fs_setsize(oip, length); uvm_vnp_setsize(ovp, length); uvm_vnp_uncache(ovp); if (aflags & B_SYNC) bwrite(bp); else bawrite(bp); oip->i_flag |= IN_CHANGE | IN_UPDATE; return (ext2fs_update(oip, 1)); } /* * Shorten the size of the file. If the file is not being * truncated to a block boundary, 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) { (void)ext2fs_setsize(oip, length); } else { lbn = lblkno(fs, length); aflags = B_CLRBUF; if (flags & IO_SYNC) aflags |= B_SYNC; error = ext2fs_buf_alloc(oip, lbn, offset, cred, &bp, aflags); if (error) return (error); (void)ext2fs_setsize(oip, length); size = fs->e2fs_bsize; uvm_vnp_setsize(ovp, length); uvm_vnp_uncache(ovp); memset(bp->b_data + offset, 0, size - offset); bp->b_bcount = size; if (aflags & B_SYNC) bwrite(bp); else bawrite(bp); } /* * 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(oldblks, &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; if ((error = ext2fs_update(oip, 1)) != 0) 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(newblks, &oip->i_e2fs_blocks[0], sizeof(newblks)); memcpy(&oip->i_e2fs_blocks[0], oldblks, sizeof(oldblks)); (void)ext2fs_setsize(oip, osize); vflags = ((length > 0) ? V_SAVE : 0) | V_SAVEMETA; allerror = vinvalbuf(ovp, vflags, cred, curproc, 0, INFSLP); /* * 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--) { bn = letoh32(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--) { bn = letoh32(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. */ (void)ext2fs_setsize(oip, length); if (blocksreleased >= oip->i_e2fs_nblock) oip->i_e2fs_nblock = 0; else 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(struct inode *ip, int32_t lbn, int32_t dbn, int32_t lastbn, int level, long *countp) { int i; struct buf *bp; struct m_ext2fs *fs = ip->i_e2fs; int32_t *bap; struct vnode *vp; int32_t *copy = NULL, nb, nlbn, last; 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, INFSLP); if (!(bp->b_flags & (B_DONE | B_DELWRI))) { curproc->p_ru.ru_inblock++; /* pay for read */ bcstats.pendingreads++; bcstats.numreads++; 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; if (lastbn >= 0) { copy = malloc(fs->e2fs_bsize, M_TEMP, M_WAITOK); memcpy(copy, bap, fs->e2fs_bsize); memset(&bap[last + 1], 0, (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) { nb = letoh32(bap[i]); if (nb == 0) continue; if (level > SINGLE) { error = ext2fs_indirtrunc(ip, nlbn, fsbtodb(fs, nb), (int32_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; nb = letoh32(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, fs->e2fs_bsize); } else { bp->b_flags |= B_INVAL; brelse(bp); } *countp = blocksreleased; return (allerror); }