/* $NetBSD: ext2fs_lookup.c,v 1.88 2016/08/23 06:40:25 christos Exp $ */ /* * Modified for NetBSD 1.2E * May 1997, Manuel Bouyer * Laboratoire d'informatique de Paris VI */ /* * modified for Lites 1.1 * * Aug 1995, Godmar Back (gback@cs.utah.edu) * University of Utah, Department of Computer Science */ /* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * 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. * * @(#)ufs_lookup.c 8.6 (Berkeley) 4/1/94 */ #include __KERNEL_RCSID(0, "$NetBSD: ext2fs_lookup.c,v 1.88 2016/08/23 06:40:25 christos Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern int dirchk; static void ext2fs_dirconv2ffs(struct m_ext2fs *fs, struct ext2fs_direct *e2dir, struct dirent *ffsdir); static int ext2fs_dirbadentry(struct vnode *dp, struct ext2fs_direct *de, int entryoffsetinblock); /* * the problem that is tackled below is the fact that FFS * includes the terminating zero on disk while EXT2FS doesn't * this implies that we need to introduce some padding. * For instance, a filename "sbin" has normally a reclen 12 * in EXT2, but 16 in FFS. * This reminds me of that Pepsi commercial: 'Kid saved a lousy nine cents...' * If it wasn't for that, the complete ufs code for directories would * have worked w/o changes (except for the difference in DIRBLKSIZ) */ static void ext2fs_dirconv2ffs(struct m_ext2fs *fs, struct ext2fs_direct *e2dir, struct dirent *ffsdir) { memset(ffsdir, 0, sizeof(struct dirent)); ffsdir->d_fileno = fs2h32(e2dir->e2d_ino); ffsdir->d_namlen = e2dir->e2d_namlen; if (EXT2F_HAS_INCOMPAT_FEATURE(fs, EXT2F_INCOMPAT_FTYPE)) ffsdir->d_type = ext2dt2dt(e2dir->e2d_type); else ffsdir->d_type = DT_UNKNOWN; #ifdef DIAGNOSTIC #if MAXNAMLEN < E2FS_MAXNAMLEN /* * we should handle this more gracefully ! */ if (e2dir->e2d_namlen > MAXNAMLEN) panic("ext2fs: e2dir->e2d_namlen"); #endif #endif strncpy(ffsdir->d_name, e2dir->e2d_name, ffsdir->d_namlen); /* Godmar thinks: since e2dir->e2d_reclen can be big and means nothing anyway, we compute our own reclen according to what we think is right */ ffsdir->d_reclen = _DIRENT_SIZE(ffsdir); } static int ext2fs_is_dot_entry(struct componentname *cnp) { return cnp->cn_namelen <= 2 && cnp->cn_nameptr[0] == '.' && (cnp->cn_nameptr[1] == '.' || cnp->cn_nameptr[1] == '\0'); } /* * Vnode op for reading directories. * * Convert the on-disk entries to entries. * the problem is that the conversion will blow up some entries by four bytes, * so it can't be done in place. This is too bad. Right now the conversion is * done entry by entry, the converted entry is sent via uiomove. * * XXX allocate a buffer, convert as many entries as possible, then send * the whole buffer to uiomove */ int ext2fs_readdir(void *v) { struct vop_readdir_args /* { struct vnode *a_vp; struct uio *a_uio; kauth_cred_t a_cred; int **a_eofflag; off_t **a_cookies; int ncookies; } */ *ap = v; struct uio *uio = ap->a_uio; int error; size_t e2fs_count, readcnt; struct vnode *vp = ap->a_vp; struct m_ext2fs *fs = VTOI(vp)->i_e2fs; struct ext2fs_direct *dp; struct dirent *dstd; struct uio auio; struct iovec aiov; void *dirbuf; off_t off = uio->uio_offset; off_t *cookies = NULL; int nc = 0, ncookies = 0; int e2d_reclen; if (vp->v_type != VDIR) return ENOTDIR; e2fs_count = uio->uio_resid; /* Make sure we don't return partial entries. */ e2fs_count -= (uio->uio_offset + e2fs_count) & (fs->e2fs_bsize -1); if (e2fs_count <= 0) return EINVAL; auio = *uio; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; aiov.iov_len = e2fs_count; auio.uio_resid = e2fs_count; UIO_SETUP_SYSSPACE(&auio); dirbuf = kmem_alloc(e2fs_count, KM_SLEEP); dstd = kmem_zalloc(sizeof(struct dirent), KM_SLEEP); if (ap->a_ncookies) { nc = e2fs_count / _DIRENT_MINSIZE((struct dirent *)0); ncookies = nc; cookies = malloc(sizeof (off_t) * ncookies, M_TEMP, M_WAITOK); *ap->a_cookies = cookies; } aiov.iov_base = dirbuf; error = UFS_BUFRD(ap->a_vp, &auio, 0, ap->a_cred); if (error == 0) { readcnt = e2fs_count - auio.uio_resid; for (dp = (struct ext2fs_direct *)dirbuf; (char *)dp < (char *)dirbuf + readcnt;) { e2d_reclen = fs2h16(dp->e2d_reclen); if (e2d_reclen == 0) { error = EIO; break; } ext2fs_dirconv2ffs(fs, dp, dstd); if(dstd->d_reclen > uio->uio_resid) { break; } error = uiomove(dstd, dstd->d_reclen, uio); if (error != 0) { break; } off = off + e2d_reclen; if (cookies != NULL) { *cookies++ = off; if (--ncookies <= 0){ break; /* out of cookies */ } } /* advance dp */ dp = (struct ext2fs_direct *) ((char *)dp + e2d_reclen); } /* we need to correct uio_offset */ uio->uio_offset = off; } kmem_free(dirbuf, e2fs_count); kmem_free(dstd, sizeof(*dstd)); *ap->a_eofflag = ext2fs_size(VTOI(ap->a_vp)) <= uio->uio_offset; if (ap->a_ncookies) { if (error) { free(*ap->a_cookies, M_TEMP); *ap->a_ncookies = 0; *ap->a_cookies = NULL; } else *ap->a_ncookies = nc - ncookies; } return error; } /* * Convert a component of a pathname into a pointer to a locked inode. * This is a very central and rather complicated routine. * If the file system is not maintained in a strict tree hierarchy, * this can result in a deadlock situation (see comments in code below). * * The cnp->cn_nameiop argument is LOOKUP, CREATE, RENAME, or DELETE depending * on whether the name is to be looked up, created, renamed, or deleted. * When CREATE, RENAME, or DELETE is specified, information usable in * creating, renaming, or deleting a directory entry may be calculated. * If flag has LOCKPARENT or'ed into it and the target of the pathname * exists, lookup returns both the target and its parent directory locked. * When creating or renaming and LOCKPARENT is specified, the target may * not be ".". When deleting and LOCKPARENT is specified, the target may * be "."., but the caller must check to ensure it does an vrele and vput * instead of two vputs. * * Overall outline of ext2fs_lookup: * * check accessibility of directory * look for name in cache, if found, then if at end of path * and deleting or creating, drop it, else return name * search for name in directory, to found or notfound * notfound: * if creating, return locked directory, leaving info on available slots * else return error * found: * if at end of path and deleting, return information to allow delete * if at end of path and rewriting (RENAME and LOCKPARENT), lock target * inode and return info to allow rewrite * if not at end, add name to cache; if at end and neither creating * nor deleting, add name to cache */ int ext2fs_lookup(void *v) { struct vop_lookup_v2_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; } */ *ap = v; struct vnode *vdp = ap->a_dvp; /* vnode for directory being searched */ struct inode *dp = VTOI(vdp); /* inode for directory being searched */ struct buf *bp; /* a buffer of directory entries */ struct ext2fs_direct *ep; /* the current directory entry */ int entryoffsetinblock; /* offset of ep in bp's buffer */ enum ext2fs_slotstatus slotstatus; doff_t slotoffset; /* offset of area with free space */ int slotsize; /* size of area at slotoffset */ int slotfreespace; /* amount of space free in slot */ int slotneeded; /* size of the entry we're seeking */ int numdirpasses; /* strategy for directory search */ doff_t endsearch; /* offset to end directory search */ doff_t prevoff; /* prev entry dp->i_offset */ struct vnode *tdp; /* returned by vcache_get */ doff_t enduseful; /* pointer past last used dir slot */ u_long bmask; /* block offset mask */ int namlen, error; struct vnode **vpp = ap->a_vpp; struct componentname *cnp = ap->a_cnp; kauth_cred_t cred = cnp->cn_cred; int flags; int nameiop = cnp->cn_nameiop; struct ufsmount *ump = dp->i_ump; int dirblksiz = ump->um_dirblksiz; ino_t foundino; struct ufs_lookup_results *results; flags = cnp->cn_flags; bp = NULL; slotoffset = -1; *vpp = NULL; /* * Produce the auxiliary lookup results into i_crap. Increment * its serial number so elsewhere we can tell if we're using * stale results. This should not be done this way. XXX. */ results = &dp->i_crap; dp->i_crapcounter++; /* * Check accessiblity of directory. */ if ((error = VOP_ACCESS(vdp, VEXEC, cred)) != 0) return error; if ((flags & ISLASTCN) && (vdp->v_mount->mnt_flag & MNT_RDONLY) && (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) return EROFS; /* * We now have a segment name to search for, and a directory to search. * * Before tediously performing a linear scan of the directory, * check the name cache to see if the directory/name pair * we are looking for is known already. */ if (cache_lookup(vdp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_nameiop, cnp->cn_flags, NULL, vpp)) { return *vpp == NULLVP ? ENOENT : 0; } /* * Suppress search for slots unless creating * file and at end of pathname, in which case * we watch for a place to put the new file in * case it doesn't already exist. */ slotstatus = FOUND; slotfreespace = slotsize = slotneeded = 0; if ((nameiop == CREATE || nameiop == RENAME) && (flags & ISLASTCN)) { slotstatus = NONE; slotneeded = EXT2FS_DIRSIZ(cnp->cn_namelen); } /* * If there is cached information on a previous search of * this directory, pick up where we last left off. * We cache only lookups as these are the most common * and have the greatest payoff. Caching CREATE has little * benefit as it usually must search the entire directory * to determine that the entry does not exist. Caching the * location of the last DELETE or RENAME has not reduced * profiling time and hence has been removed in the interest * of simplicity. */ bmask = vdp->v_mount->mnt_stat.f_iosize - 1; if (nameiop != LOOKUP || results->ulr_diroff == 0 || results->ulr_diroff >= ext2fs_size(dp)) { entryoffsetinblock = 0; results->ulr_offset = 0; numdirpasses = 1; } else { results->ulr_offset = results->ulr_diroff; if ((entryoffsetinblock = results->ulr_offset & bmask) && (error = ext2fs_blkatoff(vdp, (off_t)results->ulr_offset, NULL, &bp))) return error; numdirpasses = 2; namecache_count_2passes(); } prevoff = results->ulr_offset; endsearch = roundup(ext2fs_size(dp), dirblksiz); enduseful = 0; /* * Try to lookup dir entry using htree directory index. * * If we got an error or we want to find '.' or '..' entry, * we will fall back to linear search. */ if (!ext2fs_is_dot_entry(cnp) && ext2fs_htree_has_idx(dp)) { doff_t i_offset; /* cached i_offset value */ struct ext2fs_searchslot ss; numdirpasses = 1; entryoffsetinblock = 0; int htree_lookup_ret = ext2fs_htree_lookup(dp, cnp->cn_nameptr, cnp->cn_namelen, &bp, &entryoffsetinblock, &i_offset, &prevoff, &enduseful, &ss); switch (htree_lookup_ret) { case 0: ep = (void *)((char *)bp->b_data + (i_offset & bmask)); foundino = ep->e2d_ino; goto found; case ENOENT: i_offset = roundup2(dp->i_size, dp->i_e2fs->e2fs_bsize); goto notfound; default: /* * Something failed; just fallback to do a linear * search. */ break; } } searchloop: while (results->ulr_offset < endsearch) { if (curcpu()->ci_schedstate.spc_flags & SPCF_SHOULDYIELD) preempt(); /* * If necessary, get the next directory block. */ if ((results->ulr_offset & bmask) == 0) { if (bp != NULL) brelse(bp, 0); error = ext2fs_blkatoff(vdp, (off_t)results->ulr_offset, NULL, &bp); if (error != 0) return error; entryoffsetinblock = 0; } /* * If still looking for a slot, and at a dirblksize * boundary, have to start looking for free space again. */ if (slotstatus == NONE && (entryoffsetinblock & (dirblksiz - 1)) == 0) { slotoffset = -1; slotfreespace = 0; } /* * Get pointer to next entry. * Full validation checks are slow, so we only check * enough to insure forward progress through the * directory. Complete checks can be run by patching * "dirchk" to be true. */ KASSERT(bp != NULL); ep = (struct ext2fs_direct *) ((char *)bp->b_data + entryoffsetinblock); if (ep->e2d_reclen == 0 || (dirchk && ext2fs_dirbadentry(vdp, ep, entryoffsetinblock))) { int i; ufs_dirbad(dp, results->ulr_offset, "mangled entry"); i = dirblksiz - (entryoffsetinblock & (dirblksiz - 1)); results->ulr_offset += i; entryoffsetinblock += i; continue; } /* * If an appropriate sized slot has not yet been found, * check to see if one is available. Also accumulate space * in the current block so that we can determine if * compaction is viable. */ if (slotstatus != FOUND) { int size = fs2h16(ep->e2d_reclen); if (ep->e2d_ino != 0) size -= EXT2FS_DIRSIZ(ep->e2d_namlen); if (size > 0) { if (size >= slotneeded) { slotstatus = FOUND; slotoffset = results->ulr_offset; slotsize = fs2h16(ep->e2d_reclen); } else if (slotstatus == NONE) { slotfreespace += size; if (slotoffset == -1) slotoffset = results->ulr_offset; if (slotfreespace >= slotneeded) { slotstatus = COMPACT; slotsize = results->ulr_offset + fs2h16(ep->e2d_reclen) - slotoffset; } } } } /* * Check for a name match. */ if (ep->e2d_ino) { namlen = ep->e2d_namlen; if (namlen == cnp->cn_namelen && !memcmp(cnp->cn_nameptr, ep->e2d_name, (unsigned)namlen)) { /* * Save directory entry's inode number and * reclen in ndp->ni_ufs area, and release * directory buffer. */ foundino = fs2h32(ep->e2d_ino); results->ulr_reclen = fs2h16(ep->e2d_reclen); goto found; } } prevoff = results->ulr_offset; results->ulr_offset += fs2h16(ep->e2d_reclen); entryoffsetinblock += fs2h16(ep->e2d_reclen); if (ep->e2d_ino) enduseful = results->ulr_offset; } notfound: /* * If we started in the middle of the directory and failed * to find our target, we must check the beginning as well. */ if (numdirpasses == 2) { numdirpasses--; results->ulr_offset = 0; endsearch = results->ulr_diroff; goto searchloop; } if (bp != NULL) brelse(bp, 0); /* * If creating, and at end of pathname and current * directory has not been removed, then can consider * allowing file to be created. */ if ((nameiop == CREATE || nameiop == RENAME) && (flags & ISLASTCN) && dp->i_e2fs_nlink != 0) { /* * Access for write is interpreted as allowing * creation of files in the directory. */ error = VOP_ACCESS(vdp, VWRITE, cred); if (error) return error; /* * Return an indication of where the new directory * entry should be put. If we didn't find a slot, * then set results->ulr_count to 0 indicating * that the new slot belongs at the end of the * directory. If we found a slot, then the new entry * can be put in the range from results->ulr_offset to * results->ulr_offset + results->ulr_count. */ if (slotstatus == NONE) { results->ulr_offset = roundup(ext2fs_size(dp), dirblksiz); results->ulr_count = 0; enduseful = results->ulr_offset; } else { results->ulr_offset = slotoffset; results->ulr_count = slotsize; if (enduseful < slotoffset + slotsize) enduseful = slotoffset + slotsize; } results->ulr_endoff = roundup(enduseful, dirblksiz); #if 0 dp->i_flag |= IN_CHANGE | IN_UPDATE; #endif /* * We return with the directory locked, so that * the parameters we set up above will still be * valid if we actually decide to do a direnter(). * We return ni_vp == NULL to indicate that the entry * does not currently exist; we leave a pointer to * the (locked) directory inode in ndp->ni_dvp. * * NB - if the directory is unlocked, then this * information cannot be used. */ return EJUSTRETURN; } /* * Insert name into cache (as non-existent) if appropriate. */ if (nameiop != CREATE) { cache_enter(vdp, *vpp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_flags); } return ENOENT; found: if (numdirpasses == 2) namecache_count_pass2(); /* * Check that directory length properly reflects presence * of this entry. */ if (results->ulr_offset + EXT2FS_DIRSIZ(ep->e2d_namlen) > ext2fs_size(dp)) { ufs_dirbad(dp, results->ulr_offset, "i_size too small"); error = ext2fs_setsize(dp, results->ulr_offset + EXT2FS_DIRSIZ(ep->e2d_namlen)); if (error) { brelse(bp, 0); return error; } dp->i_flag |= IN_CHANGE | IN_UPDATE; uvm_vnp_setsize(vdp, ext2fs_size(dp)); } brelse(bp, 0); /* * Found component in pathname. * If the final component of path name, save information * in the cache as to where the entry was found. */ if ((flags & ISLASTCN) && nameiop == LOOKUP) results->ulr_diroff = results->ulr_offset &~ (dirblksiz - 1); /* * If deleting, and at end of pathname, return * parameters which can be used to remove file. * Lock the inode, being careful with ".". */ if (nameiop == DELETE && (flags & ISLASTCN)) { /* * Return pointer to current entry in results->ulr_offset, * and distance past previous entry (if there * is a previous entry in this block) in results->ulr_count. * Save directory inode pointer in ndp->ni_dvp for dirremove(). */ if ((results->ulr_offset & (dirblksiz - 1)) == 0) results->ulr_count = 0; else results->ulr_count = results->ulr_offset - prevoff; if (dp->i_number == foundino) { vref(vdp); tdp = vdp; } else { error = vcache_get(vdp->v_mount, &foundino, sizeof(foundino), &tdp); if (error) return error; } /* * Write access to directory required to delete files. */ if ((error = VOP_ACCESS(vdp, VWRITE, cred)) != 0) { vrele(tdp); return error; } /* * If directory is "sticky", then user must own * the directory, or the file in it, else she * may not delete it (unless she's root). This * implements append-only directories. */ if (dp->i_e2fs_mode & ISVTX) { error = kauth_authorize_vnode(cred, KAUTH_VNODE_DELETE, tdp, vdp, genfs_can_sticky(cred, dp->i_uid, VTOI(tdp)->i_uid)); if (error) { vrele(tdp); return EPERM; } } *vpp = tdp; return 0; } /* * If rewriting (RENAME), return the inode and the * information required to rewrite the present directory * Must get inode of directory entry to verify it's a * regular file, or empty directory. */ if (nameiop == RENAME && (flags & ISLASTCN)) { error = VOP_ACCESS(vdp, VWRITE, cred); if (error) return error; /* * Careful about locking second inode. * This can only occur if the target is ".". */ if (dp->i_number == foundino) return EISDIR; error = vcache_get(vdp->v_mount, &foundino, sizeof(foundino), &tdp); if (error) return error; *vpp = tdp; return 0; } if (dp->i_number == foundino) { vref(vdp); /* we want ourself, ie "." */ *vpp = vdp; } else { error = vcache_get(vdp->v_mount, &foundino, sizeof(foundino), &tdp); if (error) return error; *vpp = tdp; } /* * Insert name into cache if appropriate. */ cache_enter(vdp, *vpp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_flags); return 0; } static void ext2fs_accumulatespace (struct ext2fs_searchslot *ssp, struct ext2fs_direct *ep, doff_t *offp) { int size = ep->e2d_reclen; if (ep->e2d_ino != 0) size -= EXT2_DIR_REC_LEN(ep->e2d_namlen); if (size <= 0) return; if (size >= ssp->slotneeded) { ssp->slotstatus = FOUND; ssp->slotoffset = *offp; ssp->slotsize = ep->e2d_reclen; return; } if (ssp->slotstatus != NONE) return; ssp->slotfreespace += size; if (ssp->slotoffset == -1) ssp->slotoffset = *offp; if (ssp->slotfreespace >= ssp->slotneeded) { ssp->slotstatus = COMPACT; ssp->slotsize = *offp + ep->e2d_reclen - ssp->slotoffset; } } int ext2fs_search_dirblock(struct inode *ip, void *data, int *foundp, const char *name, int namelen, int *entryoffsetinblockp, doff_t *offp, doff_t *prevoffp, doff_t *endusefulp, struct ext2fs_searchslot *ssp) { struct vnode *vdp = ITOV(ip); struct ext2fs_direct *ep, *top; uint32_t bsize = ip->i_e2fs->e2fs_bsize; int offset = *entryoffsetinblockp; int namlen; ep = (void *)((char *)data + offset); top = (void *)((char *)data + bsize - EXT2_DIR_REC_LEN(0)); while (ep < top) { /* * Full validation checks are slow, so we only check * enough to insure forward progress through the * directory. Complete checks can be run by setting * "vfs.e2fs.dirchk" to be true. */ if (ep->e2d_reclen == 0 || (dirchk && ext2fs_dirbadentry(vdp, ep, offset))) { int i; ufs_dirbad(ip, *offp, "mangled entry"); i = bsize - (offset & (bsize - 1)); *offp += i; offset += i; continue; } /* * If an appropriate sized slot has not yet been found, * check to see if one is available. Also accumulate space * in the current block so that we can determine if * compaction is viable. */ if (ssp->slotstatus != FOUND) ext2fs_accumulatespace(ssp, ep, offp); /* * Check for a name match. */ if (ep->e2d_ino) { namlen = ep->e2d_namlen; if (namlen == namelen && !memcmp(name, ep->e2d_name, (unsigned)namlen)) { /* * Save directory entry's inode number and * reclen in ndp->ni_ufs area, and release * directory buffer. */ *foundp = 1; return 0; } } *prevoffp = *offp; *offp += ep->e2d_reclen; offset += ep->e2d_reclen; *entryoffsetinblockp = offset; if (ep->e2d_ino) *endusefulp = *offp; /* * Get pointer to the next entry. */ ep = (void *)((char *)data + offset); } return 0; } /* * Do consistency checking on a directory entry: * record length must be multiple of 4 * entry must fit in rest of its dirblksize block * record must be large enough to contain entry * name is not longer than EXT2FS_MAXNAMLEN * name must be as long as advertised, and null terminated */ /* * changed so that it confirms to ext2fs_check_dir_entry */ static int ext2fs_dirbadentry(struct vnode *dp, struct ext2fs_direct *de, int entryoffsetinblock) { struct ufsmount *ump = VFSTOUFS(dp->v_mount); int dirblksiz = ump->um_dirblksiz; const char *error_msg = NULL; int reclen = fs2h16(de->e2d_reclen); int namlen = de->e2d_namlen; if (reclen < EXT2FS_DIRSIZ(1)) /* e2d_namlen = 1 */ error_msg = "rec_len is smaller than minimal"; else if (reclen % 4 != 0) error_msg = "rec_len % 4 != 0"; else if (namlen > EXT2FS_MAXNAMLEN) error_msg = "namlen > EXT2FS_MAXNAMLEN"; else if (reclen < EXT2FS_DIRSIZ(namlen)) error_msg = "reclen is too small for name_len"; else if (entryoffsetinblock + reclen > dirblksiz) error_msg = "directory entry across blocks"; else if (fs2h32(de->e2d_ino) > VTOI(dp)->i_e2fs->e2fs.e2fs_icount) error_msg = "inode out of bounds"; if (error_msg != NULL) { printf( "bad directory entry: %s\n" "offset=%d, inode=%lu, rec_len=%d, name_len=%d \n", error_msg, entryoffsetinblock, (unsigned long) fs2h32(de->e2d_ino), reclen, namlen); panic("ext2fs_dirbadentry"); } return error_msg == NULL ? 0 : 1; } /* * Write a directory entry after a call to namei, using the parameters * that it left in nameidata. The argument ip is the inode which the new * directory entry will refer to. Dvp is a pointer to the directory to * be written, which was left locked by namei. Remaining parameters * (ulr_offset, ulr_count) indicate how the space for the new * entry is to be obtained. */ int ext2fs_direnter(struct inode *ip, struct vnode *dvp, const struct ufs_lookup_results *ulr, struct componentname *cnp) { struct inode *dp; struct ext2fs_direct newdir; struct iovec aiov; struct uio auio; int error; struct ufsmount *ump = VFSTOUFS(dvp->v_mount); int dirblksiz = ump->um_dirblksiz; size_t newentrysize; dp = VTOI(dvp); newdir.e2d_ino = h2fs32(ip->i_number); newdir.e2d_namlen = cnp->cn_namelen; if (EXT2F_HAS_INCOMPAT_FEATURE(ip->i_e2fs, EXT2F_INCOMPAT_FTYPE)) { newdir.e2d_type = inot2ext2dt(IFTODT(ip->i_e2fs_mode)); } else { newdir.e2d_type = 0; } memcpy(newdir.e2d_name, cnp->cn_nameptr, (unsigned)cnp->cn_namelen + 1); newentrysize = EXT2FS_DIRSIZ(cnp->cn_namelen); if (ext2fs_htree_has_idx(dp)) { error = ext2fs_htree_add_entry(dvp, &newdir, cnp, newentrysize); if (error) { dp->i_e2fs_flags &= ~EXT2_INDEX; dp->i_flag |= IN_CHANGE | IN_UPDATE; } return error; } /* * TODO check if Htree index is not created for the directory then * create one if directory entries get overflew the first dir-block */ if (ulr->ulr_count == 0) { /* * If ulr_count is 0, then namei could find no * space in the directory. Here, ulr_offset will * be on a directory block boundary and we will write the * new entry into a fresh block. */ if (ulr->ulr_offset & (dirblksiz - 1)) panic("ext2fs_direnter: newblk"); auio.uio_offset = ulr->ulr_offset; newdir.e2d_reclen = h2fs16(dirblksiz); auio.uio_resid = newentrysize; aiov.iov_len = newentrysize; aiov.iov_base = (void *)&newdir; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_rw = UIO_WRITE; UIO_SETUP_SYSSPACE(&auio); error = ext2fs_bufwr(dvp, &auio, IO_SYNC, cnp->cn_cred); if (dirblksiz > dvp->v_mount->mnt_stat.f_bsize) /* XXX should grow with balloc() */ panic("ext2fs_direnter: frag size"); else if (!error) { error = ext2fs_setsize(dp, roundup(ext2fs_size(dp), dirblksiz)); if (error) return error; dp->i_flag |= IN_CHANGE; uvm_vnp_setsize(dvp, ext2fs_size(dp)); } return error; } error = ext2fs_add_entry(dvp, &newdir, ulr, newentrysize); if (!error && ulr->ulr_endoff && ulr->ulr_endoff < ext2fs_size(dp)) error = ext2fs_truncate(dvp, (off_t)ulr->ulr_endoff, IO_SYNC, cnp->cn_cred); return error; } /* * Insert an entry into the directory block. * Compact the contents. */ int ext2fs_add_entry(struct vnode* dvp, struct ext2fs_direct *entry, const struct ufs_lookup_results *ulr, size_t newentrysize) { struct ext2fs_direct *ep, *nep; struct inode *dp; struct buf *bp; u_int dsize; int error, loc, spacefree; char *dirbuf; dp = VTOI(dvp); /* * If ulr_count is non-zero, then namei found space * for the new entry in the range ulr_offset to * ulr_offset + ulr_count in the directory. * To use this space, we may have to compact the entries located * there, by copying them together towards the beginning of the * block, leaving the free space in one usable chunk at the end. */ /* * Get the block containing the space for the new directory entry. */ if ((error = ext2fs_blkatoff(dvp, (off_t)ulr->ulr_offset, &dirbuf, &bp)) != 0) return error; /* * Find space for the new entry. In the simple case, the entry at * offset base will have the space. If it does not, then namei * arranged that compacting the region ulr_offset to * ulr_offset + ulr_count would yield the * space. */ ep = (struct ext2fs_direct *)dirbuf; dsize = EXT2FS_DIRSIZ(ep->e2d_namlen); spacefree = fs2h16(ep->e2d_reclen) - dsize; for (loc = fs2h16(ep->e2d_reclen); loc < ulr->ulr_count;) { nep = (struct ext2fs_direct *)(dirbuf + loc); if (ep->e2d_ino) { /* trim the existing slot */ ep->e2d_reclen = h2fs16(dsize); ep = (struct ext2fs_direct *)((char *)ep + dsize); } else { /* overwrite; nothing there; header is ours */ spacefree += dsize; } dsize = EXT2FS_DIRSIZ(nep->e2d_namlen); spacefree += fs2h16(nep->e2d_reclen) - dsize; loc += fs2h16(nep->e2d_reclen); memcpy((void *)ep, (void *)nep, dsize); } /* * Update the pointer fields in the previous entry (if any), * copy in the new entry, and write out the block. */ if (ep->e2d_ino == 0) { #ifdef DIAGNOSTIC if (spacefree + dsize < newentrysize) panic("ext2fs_direnter: compact1"); #endif entry->e2d_reclen = h2fs16(spacefree + dsize); } else { #ifdef DIAGNOSTIC if (spacefree < newentrysize) { printf("ext2fs_direnter: compact2 %u %u", (u_int)spacefree, (u_int)newentrysize); panic("ext2fs_direnter: compact2"); } #endif entry->e2d_reclen = h2fs16(spacefree); ep->e2d_reclen = h2fs16(dsize); ep = (struct ext2fs_direct *)((char *)ep + dsize); } memcpy(ep, entry, (u_int)newentrysize); error = VOP_BWRITE(bp->b_vp, bp); dp->i_flag |= IN_CHANGE | IN_UPDATE; return error; } /* * Remove a directory entry after a call to namei, using * the auxiliary results it provided. The entry * ulr_offset contains the offset into the directory of the * entry to be eliminated. The ulr_count field contains the * size of the previous record in the directory. If this * is 0, the first entry is being deleted, so we need only * zero the inode number to mark the entry as free. If the * entry is not the first in the directory, we must reclaim * the space of the now empty record by adding the record size * to the size of the previous entry. */ int ext2fs_dirremove(struct vnode *dvp, const struct ufs_lookup_results *ulr, struct componentname *cnp) { struct inode *dp; struct ext2fs_direct *ep; struct buf *bp; int error; dp = VTOI(dvp); if (ulr->ulr_count == 0) { /* * First entry in block: set d_ino to zero. */ error = ext2fs_blkatoff(dvp, (off_t)ulr->ulr_offset, (void *)&ep, &bp); if (error != 0) return error; ep->e2d_ino = 0; error = VOP_BWRITE(bp->b_vp, bp); dp->i_flag |= IN_CHANGE | IN_UPDATE; return error; } /* * Collapse new free space into previous entry. */ error = ext2fs_blkatoff(dvp, (off_t)(ulr->ulr_offset - ulr->ulr_count), (void *)&ep, &bp); if (error != 0) return error; ep->e2d_reclen = h2fs16(fs2h16(ep->e2d_reclen) + ulr->ulr_reclen); error = VOP_BWRITE(bp->b_vp, bp); dp->i_flag |= IN_CHANGE | IN_UPDATE; return error; } /* * Rewrite an existing directory entry to point at the inode * supplied. The parameters describing the directory entry are * set up by a call to namei. */ int ext2fs_dirrewrite(struct inode *dp, const struct ufs_lookup_results *ulr, struct inode *ip, struct componentname *cnp) { struct buf *bp; struct ext2fs_direct *ep; struct vnode *vdp = ITOV(dp); int error; error = ext2fs_blkatoff(vdp, (off_t)ulr->ulr_offset, (void *)&ep, &bp); if (error != 0) return error; ep->e2d_ino = h2fs32(ip->i_number); if (EXT2F_HAS_INCOMPAT_FEATURE(dp->i_e2fs, EXT2F_INCOMPAT_FTYPE)) { ep->e2d_type = inot2ext2dt(IFTODT(ip->i_e2fs_mode)); } else { ep->e2d_type = 0; } error = VOP_BWRITE(bp->b_vp, bp); dp->i_flag |= IN_CHANGE | IN_UPDATE; return error; } /* * Check if a directory is empty or not. * Inode supplied must be locked. * * Using a struct dirtemplate here is not precisely * what we want, but better than using a struct ext2fs_direct. * * NB: does not handle corrupted directories. */ int ext2fs_dirempty(struct inode *ip, ino_t parentino, kauth_cred_t cred) { off_t off; struct ext2fs_dirtemplate dbuf; struct ext2fs_direct *dp = (struct ext2fs_direct *)&dbuf; int error, namlen; size_t count; #define MINDIRSIZ (sizeof (struct ext2fs_dirtemplate) / 2) for (off = 0; off < ext2fs_size(ip); off += fs2h16(dp->e2d_reclen)) { error = ufs_bufio(UIO_READ, ITOV(ip), (void *)dp, MINDIRSIZ, off, IO_NODELOCKED, cred, &count, NULL); /* * Since we read MINDIRSIZ, residual must * be 0 unless we're at end of file. */ if (error || count != 0) return 0; /* avoid infinite loops */ if (dp->e2d_reclen == 0) return 0; /* skip empty entries */ if (dp->e2d_ino == 0) continue; /* accept only "." and ".." */ namlen = dp->e2d_namlen; if (namlen > 2) return 0; if (dp->e2d_name[0] != '.') return 0; /* * At this point namlen must be 1 or 2. * 1 implies ".", 2 implies ".." if second * char is also "." */ if (namlen == 1) continue; if (dp->e2d_name[1] == '.' && fs2h32(dp->e2d_ino) == parentino) continue; return 0; } return 1; }