1139778Simp/*- 212115Sdyson * modified for Lites 1.1 312115Sdyson * 412115Sdyson * Aug 1995, Godmar Back (gback@cs.utah.edu) 512115Sdyson * University of Utah, Department of Computer Science 612115Sdyson */ 7139778Simp/*- 812115Sdyson * Copyright (c) 1989, 1993 912115Sdyson * The Regents of the University of California. All rights reserved. 1012115Sdyson * (c) UNIX System Laboratories, Inc. 1112115Sdyson * All or some portions of this file are derived from material licensed 1212115Sdyson * to the University of California by American Telephone and Telegraph 1312115Sdyson * Co. or Unix System Laboratories, Inc. and are reproduced herein with 1412115Sdyson * the permission of UNIX System Laboratories, Inc. 1512115Sdyson * 1612115Sdyson * Redistribution and use in source and binary forms, with or without 1712115Sdyson * modification, are permitted provided that the following conditions 1812115Sdyson * are met: 1912115Sdyson * 1. Redistributions of source code must retain the above copyright 2012115Sdyson * notice, this list of conditions and the following disclaimer. 2112115Sdyson * 2. Redistributions in binary form must reproduce the above copyright 2212115Sdyson * notice, this list of conditions and the following disclaimer in the 2312115Sdyson * documentation and/or other materials provided with the distribution. 2412115Sdyson * 4. Neither the name of the University nor the names of its contributors 2512115Sdyson * may be used to endorse or promote products derived from this software 2612115Sdyson * without specific prior written permission. 2712115Sdyson * 2812115Sdyson * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2912115Sdyson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 3012115Sdyson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3112115Sdyson * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3212115Sdyson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3312115Sdyson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3412115Sdyson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3512115Sdyson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3612115Sdyson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3712115Sdyson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3812115Sdyson * SUCH DAMAGE. 3912115Sdyson * 4012115Sdyson * @(#)ufs_lookup.c 8.6 (Berkeley) 4/1/94 4193016Sbde * $FreeBSD$ 4212115Sdyson */ 4312115Sdyson 4412115Sdyson#include <sys/param.h> 4512159Sbde#include <sys/systm.h> 4612115Sdyson#include <sys/namei.h> 4760041Sphk#include <sys/bio.h> 4812115Sdyson#include <sys/buf.h> 49193377Sstas#include <sys/endian.h> 5012115Sdyson#include <sys/mount.h> 5112115Sdyson#include <sys/vnode.h> 5212115Sdyson#include <sys/malloc.h> 5312115Sdyson#include <sys/dirent.h> 5496753Siedowse#include <sys/sysctl.h> 5512115Sdyson 5612115Sdyson#include <ufs/ufs/dir.h> 5712115Sdyson 58202283Slulf#include <fs/ext2fs/inode.h> 59202283Slulf#include <fs/ext2fs/ext2_mount.h> 60202283Slulf#include <fs/ext2fs/ext2fs.h> 61221128Sjhb#include <fs/ext2fs/ext2_dinode.h> 62202283Slulf#include <fs/ext2fs/ext2_dir.h> 63221128Sjhb#include <fs/ext2fs/ext2_extern.h> 6412115Sdyson 65252008Spfg#ifdef INVARIANTS 6696753Siedowsestatic int dirchk = 1; 6796753Siedowse#else 6896753Siedowsestatic int dirchk = 0; 6996753Siedowse#endif 7096753Siedowse 71141633Sphkstatic SYSCTL_NODE(_vfs, OID_AUTO, e2fs, CTLFLAG_RD, 0, "EXT2FS filesystem"); 7296753SiedowseSYSCTL_INT(_vfs_e2fs, OID_AUTO, dircheck, CTLFLAG_RW, &dirchk, 0, ""); 7396753Siedowse 74111742Sdes/* 7512115Sdyson DIRBLKSIZE in ffs is DEV_BSIZE (in most cases 512) 7612115Sdyson while it is the native blocksize in ext2fs - thus, a #define 7712115Sdyson is no longer appropriate 7812115Sdyson*/ 7912115Sdyson#undef DIRBLKSIZ 8012115Sdyson 8155477Sbdestatic u_char ext2_ft_to_dt[] = { 8255477Sbde DT_UNKNOWN, /* EXT2_FT_UNKNOWN */ 8355477Sbde DT_REG, /* EXT2_FT_REG_FILE */ 8455477Sbde DT_DIR, /* EXT2_FT_DIR */ 8555477Sbde DT_CHR, /* EXT2_FT_CHRDEV */ 8655477Sbde DT_BLK, /* EXT2_FT_BLKDEV */ 8755477Sbde DT_FIFO, /* EXT2_FT_FIFO */ 8855477Sbde DT_SOCK, /* EXT2_FT_SOCK */ 8955477Sbde DT_LNK, /* EXT2_FT_SYMLINK */ 9055477Sbde}; 91247055Spfg#define FTTODT(ft) \ 92247055Spfg ((ft) < nitems(ext2_ft_to_dt) ? ext2_ft_to_dt[(ft)] : DT_UNKNOWN) 9355477Sbde 9455477Sbdestatic u_char dt_to_ext2_ft[] = { 9555477Sbde EXT2_FT_UNKNOWN, /* DT_UNKNOWN */ 9655477Sbde EXT2_FT_FIFO, /* DT_FIFO */ 9755477Sbde EXT2_FT_CHRDEV, /* DT_CHR */ 9855477Sbde EXT2_FT_UNKNOWN, /* unused */ 9955477Sbde EXT2_FT_DIR, /* DT_DIR */ 10055477Sbde EXT2_FT_UNKNOWN, /* unused */ 10155477Sbde EXT2_FT_BLKDEV, /* DT_BLK */ 10255477Sbde EXT2_FT_UNKNOWN, /* unused */ 10355477Sbde EXT2_FT_REG_FILE, /* DT_REG */ 10455477Sbde EXT2_FT_UNKNOWN, /* unused */ 10555477Sbde EXT2_FT_SYMLINK, /* DT_LNK */ 10655477Sbde EXT2_FT_UNKNOWN, /* unused */ 10755477Sbde EXT2_FT_SOCK, /* DT_SOCK */ 10855477Sbde EXT2_FT_UNKNOWN, /* unused */ 10955477Sbde EXT2_FT_UNKNOWN, /* DT_WHT */ 11055477Sbde}; 111247055Spfg#define DTTOFT(dt) \ 112247055Spfg ((dt) < nitems(dt_to_ext2_ft) ? dt_to_ext2_ft[(dt)] : EXT2_FT_UNKNOWN) 11355477Sbde 114202283Slulfstatic int ext2_dirbadentry(struct vnode *dp, struct ext2fs_direct_2 *de, 11593014Sbde int entryoffsetinblock); 116254205Spfgstatic int ext2_is_dot_entry(struct componentname *cnp); 117235820Spfgstatic int ext2_lookup_ino(struct vnode *vdp, struct vnode **vpp, 118235820Spfg struct componentname *cnp, ino_t *dd_ino); 11912159Sbde 120254205Spfgstatic int 121254205Spfgext2_is_dot_entry(struct componentname *cnp) 122254205Spfg{ 123254205Spfg if (cnp->cn_namelen <= 2 && cnp->cn_nameptr[0] == '.' && 124254205Spfg (cnp->cn_nameptr[1] == '.' || cnp->cn_nameptr[1] == '0')) 125254205Spfg return (1); 126254205Spfg return (0); 127254205Spfg} 128254205Spfg 12912115Sdyson/* 13012115Sdyson * Vnode op for reading directories. 13112115Sdyson */ 13212115Sdysonint 133247209Spfgext2_readdir(struct vop_readdir_args *ap) 13412115Sdyson{ 135254801Spfg struct vnode *vp = ap->a_vp; 136111742Sdes struct uio *uio = ap->a_uio; 137254801Spfg struct buf *bp; 138254801Spfg struct inode *ip; 139254801Spfg struct ext2fs_direct_2 *dp, *edp; 140254801Spfg u_long *cookies; 141254801Spfg struct dirent dstdp; 142254801Spfg off_t offset, startoffset; 143254801Spfg size_t readcnt, skipcnt; 144254801Spfg ssize_t startresid; 14524649Sdfr int ncookies; 146202283Slulf int DIRBLKSIZ = VTOI(ap->a_vp)->i_e2fs->e2fs_bsize; 147254801Spfg int error; 14812115Sdyson 149254801Spfg if (uio->uio_offset < 0) 150254801Spfg return (EINVAL); 151254801Spfg ip = VTOI(vp); 152254801Spfg if (ap->a_ncookies != NULL) { 153254801Spfg ncookies = uio->uio_resid; 154254801Spfg if (uio->uio_offset >= ip->i_size) 155254801Spfg ncookies = 0; 156254801Spfg else if (ip->i_size - uio->uio_offset < ncookies) 157254801Spfg ncookies = ip->i_size - uio->uio_offset; 158254801Spfg ncookies = ncookies / (offsetof(struct ext2fs_direct_2, 159254801Spfg e2d_namlen) + 4) + 1; 160254801Spfg cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK); 161254801Spfg *ap->a_ncookies = ncookies; 162254801Spfg *ap->a_cookies = cookies; 163254801Spfg } else { 16424649Sdfr ncookies = 0; 165254801Spfg cookies = NULL; 166254801Spfg } 167254801Spfg offset = startoffset = uio->uio_offset; 168254801Spfg startresid = uio->uio_resid; 169254801Spfg error = 0; 170254801Spfg while (error == 0 && uio->uio_resid > 0 && 171254801Spfg uio->uio_offset < ip->i_size) { 172254801Spfg error = ext2_blkatoff(vp, uio->uio_offset, NULL, &bp); 173254801Spfg if (error) 174254801Spfg break; 175254801Spfg if (bp->b_offset + bp->b_bcount > ip->i_size) 176254801Spfg readcnt = ip->i_size - bp->b_offset; 177254801Spfg else 178254801Spfg readcnt = bp->b_bcount; 179254801Spfg skipcnt = (size_t)(uio->uio_offset - bp->b_offset) & 180254801Spfg ~(size_t)(DIRBLKSIZ - 1); 181254801Spfg offset = bp->b_offset + skipcnt; 182254801Spfg dp = (struct ext2fs_direct_2 *)&bp->b_data[skipcnt]; 183254801Spfg edp = (struct ext2fs_direct_2 *)&bp->b_data[readcnt]; 184254801Spfg while (error == 0 && uio->uio_resid > 0 && dp < edp) { 185254801Spfg if (dp->e2d_reclen <= offsetof(struct ext2fs_direct_2, 186254801Spfg e2d_namlen) || (caddr_t)dp + dp->e2d_reclen > 187254801Spfg (caddr_t)edp) { 188254801Spfg error = EIO; 189254801Spfg break; 190254801Spfg } 19155477Sbde /*- 19255477Sbde * "New" ext2fs directory entries differ in 3 ways 19355477Sbde * from ufs on-disk ones: 19455477Sbde * - the name is not necessarily NUL-terminated. 19555477Sbde * - the file type field always exists and always 196125843Sbde * follows the name length field. 19755477Sbde * - the file type is encoded in a different way. 19855477Sbde * 19955477Sbde * "Old" ext2fs directory entries need no special 200125843Sbde * conversions, since they are binary compatible 201125843Sbde * with "new" entries having a file type of 0 (i.e., 20255477Sbde * EXT2_FT_UNKNOWN). Splitting the old name length 20355477Sbde * field didn't make a mess like it did in ufs, 204125843Sbde * because ext2fs uses a machine-independent disk 20555477Sbde * layout. 20655477Sbde */ 207254801Spfg dstdp.d_namlen = dp->e2d_namlen; 208254801Spfg dstdp.d_type = FTTODT(dp->e2d_type); 209254801Spfg if (offsetof(struct ext2fs_direct_2, e2d_namlen) + 210254801Spfg dstdp.d_namlen > dp->e2d_reclen) { 211254801Spfg error = EIO; 212254801Spfg break; 213254801Spfg } 214254801Spfg if (offset < startoffset || dp->e2d_ino == 0) 215254801Spfg goto nextentry; 216202283Slulf dstdp.d_fileno = dp->e2d_ino; 21755477Sbde dstdp.d_reclen = GENERIC_DIRSIZ(&dstdp); 218202283Slulf bcopy(dp->e2d_name, dstdp.d_name, dstdp.d_namlen); 219254801Spfg dstdp.d_name[dstdp.d_namlen] = '\0'; 220254801Spfg if (dstdp.d_reclen > uio->uio_resid) { 221254801Spfg if (uio->uio_resid == startresid) 222254801Spfg error = EINVAL; 223254801Spfg else 224254801Spfg error = EJUSTRETURN; 22512115Sdyson break; 22612115Sdyson } 227254801Spfg /* Advance dp. */ 228254801Spfg error = uiomove((caddr_t)&dstdp, dstdp.d_reclen, uio); 229254801Spfg if (error) 230254801Spfg break; 231254801Spfg if (cookies != NULL) { 232254801Spfg KASSERT(ncookies > 0, 233254801Spfg ("ext2_readdir: cookies buffer too small")); 234254801Spfg *cookies = offset + dp->e2d_reclen; 235254801Spfg cookies++; 236254801Spfg ncookies--; 23724649Sdfr } 238254801Spfgnextentry: 239254801Spfg offset += dp->e2d_reclen; 240254801Spfg dp = (struct ext2fs_direct_2 *)((caddr_t)dp + 241254801Spfg dp->e2d_reclen); 24224649Sdfr } 243254801Spfg bqrelse(bp); 244254801Spfg uio->uio_offset = offset; 24512115Sdyson } 246254801Spfg /* We need to correct uio_offset. */ 247254801Spfg uio->uio_offset = offset; 248254801Spfg if (error == EJUSTRETURN) 249254801Spfg error = 0; 250254801Spfg if (ap->a_ncookies != NULL) { 251254801Spfg if (error == 0) { 252254801Spfg ap->a_ncookies -= ncookies; 253254801Spfg } else { 254254801Spfg free(*ap->a_cookies, M_TEMP); 255254801Spfg *ap->a_ncookies = 0; 256254801Spfg *ap->a_cookies = NULL; 257254801Spfg } 258254801Spfg } 259254801Spfg if (error == 0 && ap->a_eofflag) 260254801Spfg *ap->a_eofflag = ip->i_size <= uio->uio_offset; 261111742Sdes return (error); 26212115Sdyson} 26312115Sdyson 26412115Sdyson/* 26512115Sdyson * Convert a component of a pathname into a pointer to a locked inode. 26612115Sdyson * This is a very central and rather complicated routine. 26712115Sdyson * If the file system is not maintained in a strict tree hierarchy, 26812115Sdyson * this can result in a deadlock situation (see comments in code below). 26912115Sdyson * 27012115Sdyson * The cnp->cn_nameiop argument is LOOKUP, CREATE, RENAME, or DELETE depending 27112115Sdyson * on whether the name is to be looked up, created, renamed, or deleted. 27212115Sdyson * When CREATE, RENAME, or DELETE is specified, information usable in 27312115Sdyson * creating, renaming, or deleting a directory entry may be calculated. 27412115Sdyson * If flag has LOCKPARENT or'ed into it and the target of the pathname 27512115Sdyson * exists, lookup returns both the target and its parent directory locked. 27612115Sdyson * When creating or renaming and LOCKPARENT is specified, the target may 27712115Sdyson * not be ".". When deleting and LOCKPARENT is specified, the target may 27812115Sdyson * be "."., but the caller must check to ensure it does an vrele and vput 27912115Sdyson * instead of two vputs. 28012115Sdyson * 281125843Sbde * Overall outline of ext2_lookup: 28212115Sdyson * 28312115Sdyson * search for name in directory, to found or notfound 28412115Sdyson * notfound: 28512115Sdyson * if creating, return locked directory, leaving info on available slots 28612115Sdyson * else return error 28712115Sdyson * found: 28812115Sdyson * if at end of path and deleting, return information to allow delete 28912115Sdyson * if at end of path and rewriting (RENAME and LOCKPARENT), lock target 29012115Sdyson * inode and return info to allow rewrite 29112115Sdyson * if not at end, add name to cache; if at end and neither creating 29212115Sdyson * nor deleting, add name to cache 29312115Sdyson */ 29412115Sdysonint 295247209Spfgext2_lookup(struct vop_cachedlookup_args *ap) 29612115Sdyson{ 297235820Spfg 298235820Spfg return (ext2_lookup_ino(ap->a_dvp, ap->a_vpp, ap->a_cnp, NULL)); 299235820Spfg} 300235820Spfg 301235820Spfgstatic int 302235820Spfgext2_lookup_ino(struct vnode *vdp, struct vnode **vpp, struct componentname *cnp, 303235820Spfg ino_t *dd_ino) 304235820Spfg{ 30596752Siedowse struct inode *dp; /* inode for directory being searched */ 30612115Sdyson struct buf *bp; /* a buffer of directory entries */ 307202283Slulf struct ext2fs_direct_2 *ep; /* the current directory entry */ 30812115Sdyson int entryoffsetinblock; /* offset of ep in bp's buffer */ 309254205Spfg struct ext2fs_searchslot ss; 310202283Slulf doff_t i_diroff; /* cached i_diroff value */ 311202283Slulf doff_t i_offset; /* cached i_offset value */ 31212115Sdyson int numdirpasses; /* strategy for directory search */ 31312115Sdyson doff_t endsearch; /* offset to end directory search */ 31412115Sdyson doff_t prevoff; /* prev entry dp->i_offset */ 31512115Sdyson struct vnode *pdp; /* saved dp during symlink work */ 31612115Sdyson struct vnode *tdp; /* returned by VFS_VGET */ 31712115Sdyson doff_t enduseful; /* pointer past last used dir slot */ 31812115Sdyson u_long bmask; /* block offset mask */ 319254205Spfg int error; 32012115Sdyson struct ucred *cred = cnp->cn_cred; 32112115Sdyson int flags = cnp->cn_flags; 32212115Sdyson int nameiop = cnp->cn_nameiop; 323235820Spfg ino_t ino, ino1; 324202283Slulf int ltype; 325254205Spfg int entry_found = 0; 32612115Sdyson 327235820Spfg int DIRBLKSIZ = VTOI(vdp)->i_e2fs->e2fs_bsize; 32812115Sdyson 329235820Spfg if (vpp != NULL) 330235820Spfg *vpp = NULL; 331235820Spfg 332235820Spfg dp = VTOI(vdp); 333235820Spfg bmask = VFSTOEXT2(vdp->v_mount)->um_mountp->mnt_stat.f_iosize - 1; 334235820Spfgrestart: 33512115Sdyson bp = NULL; 336254205Spfg ss.slotoffset = -1; 337217584Sjhb 33812115Sdyson /* 33912115Sdyson * We now have a segment name to search for, and a directory to search. 340254205Spfg * 34112115Sdyson * Suppress search for slots unless creating 34212115Sdyson * file and at end of pathname, in which case 34312115Sdyson * we watch for a place to put the new file in 34412115Sdyson * case it doesn't already exist. 34512115Sdyson */ 346202283Slulf ino = 0; 347202283Slulf i_diroff = dp->i_diroff; 348254205Spfg ss.slotstatus = FOUND; 349254205Spfg ss.slotfreespace = ss.slotsize = ss.slotneeded = 0; 35012115Sdyson if ((nameiop == CREATE || nameiop == RENAME) && 35112115Sdyson (flags & ISLASTCN)) { 352254205Spfg ss.slotstatus = NONE; 353254205Spfg ss.slotneeded = EXT2_DIR_REC_LEN(cnp->cn_namelen); 35412115Sdyson /* was 355254205Spfg ss.slotneeded = (sizeof(struct direct) - MAXNAMLEN + 35612115Sdyson cnp->cn_namelen + 3) &~ 3; */ 35712115Sdyson } 35812115Sdyson 35912115Sdyson /* 360254205Spfg * Try to lookup dir entry using htree directory index. 361254205Spfg * 362254205Spfg * If we got an error or we want to find '.' or '..' entry, 363254205Spfg * we will fall back to linear search. 364254205Spfg */ 365254205Spfg if (!ext2_is_dot_entry(cnp) && ext2_htree_has_idx(dp)) { 366254205Spfg numdirpasses = 1; 367254205Spfg entryoffsetinblock = 0; 368254205Spfg switch (ext2_htree_lookup(dp, cnp->cn_nameptr, cnp->cn_namelen, 369254205Spfg &bp, &entryoffsetinblock, &i_offset, &prevoff, 370254205Spfg &enduseful, &ss)) { 371254205Spfg case 0: 372254205Spfg ep = (struct ext2fs_direct_2 *)((char *)bp->b_data + 373254205Spfg (i_offset & bmask)); 374254205Spfg goto foundentry; 375254205Spfg case ENOENT: 376254205Spfg i_offset = roundup2(dp->i_size, DIRBLKSIZ); 377254205Spfg goto notfound; 378254205Spfg default: 379254205Spfg /* 380254205Spfg * Something failed; just fallback to do a linear 381254205Spfg * search. 382254205Spfg */ 383254205Spfg break; 384254205Spfg } 385254205Spfg } 386254205Spfg 387254205Spfg /* 38812115Sdyson * If there is cached information on a previous search of 38912115Sdyson * this directory, pick up where we last left off. 39012115Sdyson * We cache only lookups as these are the most common 39112115Sdyson * and have the greatest payoff. Caching CREATE has little 39212115Sdyson * benefit as it usually must search the entire directory 39312115Sdyson * to determine that the entry does not exist. Caching the 39412115Sdyson * location of the last DELETE or RENAME has not reduced 39512115Sdyson * profiling time and hence has been removed in the interest 39612115Sdyson * of simplicity. 39712115Sdyson */ 398202283Slulf if (nameiop != LOOKUP || i_diroff == 0 || 399202283Slulf i_diroff > dp->i_size) { 40012115Sdyson entryoffsetinblock = 0; 401202283Slulf i_offset = 0; 40212115Sdyson numdirpasses = 1; 40312115Sdyson } else { 404202283Slulf i_offset = i_diroff; 405202283Slulf if ((entryoffsetinblock = i_offset & bmask) && 406202283Slulf (error = ext2_blkatoff(vdp, (off_t)i_offset, NULL, 40796749Siedowse &bp))) 40812115Sdyson return (error); 40912115Sdyson numdirpasses = 2; 41012115Sdyson nchstats.ncs_2passes++; 41112115Sdyson } 412202283Slulf prevoff = i_offset; 413202283Slulf endsearch = roundup2(dp->i_size, DIRBLKSIZ); 41412115Sdyson enduseful = 0; 41512115Sdyson 41612115Sdysonsearchloop: 417202283Slulf while (i_offset < endsearch) { 41812115Sdyson /* 41912115Sdyson * If necessary, get the next directory block. 42012115Sdyson */ 421254205Spfg if (bp != NULL) 422254205Spfg brelse(bp); 423254205Spfg error = ext2_blkatoff(vdp, (off_t)i_offset, NULL, &bp); 424254205Spfg if (error != 0) 425254205Spfg return (error); 426254205Spfg entryoffsetinblock = 0; 42712115Sdyson /* 42812115Sdyson * If still looking for a slot, and at a DIRBLKSIZE 42912115Sdyson * boundary, have to start looking for free space again. 43012115Sdyson */ 431254205Spfg if (ss.slotstatus == NONE && 43212115Sdyson (entryoffsetinblock & (DIRBLKSIZ - 1)) == 0) { 433254205Spfg ss.slotoffset = -1; 434254205Spfg ss.slotfreespace = 0; 43512115Sdyson } 436254205Spfg error = ext2_search_dirblock(dp, bp->b_data, &entry_found, 437254205Spfg cnp->cn_nameptr, cnp->cn_namelen, 438254205Spfg &entryoffsetinblock, &i_offset, &prevoff, 439254205Spfg &enduseful, &ss); 440254205Spfg if (error != 0) { 441254205Spfg brelse(bp); 442254205Spfg return (error); 44312115Sdyson } 444254205Spfg if (entry_found) { 445254205Spfg ep = (struct ext2fs_direct_2 *)((char *)bp->b_data + 446254205Spfg (entryoffsetinblock & bmask)); 447254205Spfgfoundentry: 448254205Spfg ino = ep->e2d_ino; 449254205Spfg goto found; 45012115Sdyson } 45112115Sdyson } 452254205Spfgnotfound: 45312115Sdyson /* 45412115Sdyson * If we started in the middle of the directory and failed 45512115Sdyson * to find our target, we must check the beginning as well. 45612115Sdyson */ 45712115Sdyson if (numdirpasses == 2) { 45812115Sdyson numdirpasses--; 459202283Slulf i_offset = 0; 460202283Slulf endsearch = i_diroff; 46112115Sdyson goto searchloop; 46212115Sdyson } 46312115Sdyson if (bp != NULL) 46412115Sdyson brelse(bp); 46512115Sdyson /* 46612115Sdyson * If creating, and at end of pathname and current 46712115Sdyson * directory has not been removed, then can consider 46812115Sdyson * allowing file to be created. 46912115Sdyson */ 47012115Sdyson if ((nameiop == CREATE || nameiop == RENAME) && 47112115Sdyson (flags & ISLASTCN) && dp->i_nlink != 0) { 47212115Sdyson /* 47312115Sdyson * Access for write is interpreted as allowing 47412115Sdyson * creation of files in the directory. 47512115Sdyson */ 47683366Sjulian if ((error = VOP_ACCESS(vdp, VWRITE, cred, cnp->cn_thread)) != 0) 47712115Sdyson return (error); 47812115Sdyson /* 47912115Sdyson * Return an indication of where the new directory 48012115Sdyson * entry should be put. If we didn't find a slot, 48112115Sdyson * then set dp->i_count to 0 indicating 48212115Sdyson * that the new slot belongs at the end of the 48312115Sdyson * directory. If we found a slot, then the new entry 48412115Sdyson * can be put in the range from dp->i_offset to 48512115Sdyson * dp->i_offset + dp->i_count. 48612115Sdyson */ 487254205Spfg if (ss.slotstatus == NONE) { 488202283Slulf dp->i_offset = roundup2(dp->i_size, DIRBLKSIZ); 48912115Sdyson dp->i_count = 0; 49012115Sdyson enduseful = dp->i_offset; 49112115Sdyson } else { 492254205Spfg dp->i_offset = ss.slotoffset; 493254205Spfg dp->i_count = ss.slotsize; 494254205Spfg if (enduseful < ss.slotoffset + ss.slotsize) 495254205Spfg enduseful = ss.slotoffset + ss.slotsize; 49612115Sdyson } 497202283Slulf dp->i_endoff = roundup2(enduseful, DIRBLKSIZ); 49812115Sdyson /* 49912115Sdyson * We return with the directory locked, so that 50012115Sdyson * the parameters we set up above will still be 50112115Sdyson * valid if we actually decide to do a direnter(). 50212115Sdyson * We return ni_vp == NULL to indicate that the entry 50312115Sdyson * does not currently exist; we leave a pointer to 50412115Sdyson * the (locked) directory inode in ndp->ni_dvp. 50512115Sdyson * The pathname buffer is saved so that the name 50612115Sdyson * can be obtained later. 50712115Sdyson * 50812115Sdyson * NB - if the directory is unlocked, then this 50912115Sdyson * information cannot be used. 51012115Sdyson */ 51112115Sdyson cnp->cn_flags |= SAVENAME; 51212115Sdyson return (EJUSTRETURN); 51312115Sdyson } 51412115Sdyson /* 51512115Sdyson * Insert name into cache (as non-existent) if appropriate. 51612115Sdyson */ 51712115Sdyson if ((cnp->cn_flags & MAKEENTRY) && nameiop != CREATE) 518235820Spfg cache_enter(vdp, NULL, cnp); 51912115Sdyson return (ENOENT); 52012115Sdyson 52112115Sdysonfound: 522235820Spfg if (dd_ino != NULL) 523235820Spfg *dd_ino = ino; 52412115Sdyson if (numdirpasses == 2) 52512115Sdyson nchstats.ncs_pass2++; 52612115Sdyson /* 52712115Sdyson * Check that directory length properly reflects presence 52812115Sdyson * of this entry. 52912115Sdyson */ 530202283Slulf if (entryoffsetinblock + EXT2_DIR_REC_LEN(ep->e2d_namlen) 53112115Sdyson > dp->i_size) { 532202283Slulf ext2_dirbad(dp, i_offset, "i_size too small"); 533202283Slulf dp->i_size = entryoffsetinblock+EXT2_DIR_REC_LEN(ep->e2d_namlen); 53412115Sdyson dp->i_flag |= IN_CHANGE | IN_UPDATE; 53512115Sdyson } 536105420Sbde brelse(bp); 53712115Sdyson 53812115Sdyson /* 53912115Sdyson * Found component in pathname. 54012115Sdyson * If the final component of path name, save information 54112115Sdyson * in the cache as to where the entry was found. 54212115Sdyson */ 54312115Sdyson if ((flags & ISLASTCN) && nameiop == LOOKUP) 544202283Slulf dp->i_diroff = i_offset &~ (DIRBLKSIZ - 1); 54512115Sdyson /* 54612115Sdyson * If deleting, and at end of pathname, return 54712115Sdyson * parameters which can be used to remove file. 54812115Sdyson */ 54912115Sdyson if (nameiop == DELETE && (flags & ISLASTCN)) { 550252677Spfg if (flags & LOCKPARENT) 551252677Spfg ASSERT_VOP_ELOCKED(vdp, __FUNCTION__); 55212115Sdyson /* 55312115Sdyson * Write access to directory required to delete files. 55412115Sdyson */ 55583366Sjulian if ((error = VOP_ACCESS(vdp, VWRITE, cred, cnp->cn_thread)) != 0) 55612115Sdyson return (error); 55712115Sdyson /* 55812115Sdyson * Return pointer to current entry in dp->i_offset, 55912115Sdyson * and distance past previous entry (if there 56012115Sdyson * is a previous entry in this block) in dp->i_count. 56112115Sdyson * Save directory inode pointer in ndp->ni_dvp for dirremove(). 562252677Spfg * 563252677Spfg * Technically we shouldn't be setting these in the 564252677Spfg * WANTPARENT case (first lookup in rename()), but any 565252677Spfg * lookups that will result in directory changes will 566252677Spfg * overwrite these. 56712115Sdyson */ 568252677Spfg dp->i_offset = i_offset; 56912115Sdyson if ((dp->i_offset & (DIRBLKSIZ - 1)) == 0) 57012115Sdyson dp->i_count = 0; 57112115Sdyson else 57212115Sdyson dp->i_count = dp->i_offset - prevoff; 573235820Spfg if (dd_ino != NULL) 574235820Spfg return (0); 575202283Slulf if (dp->i_number == ino) { 57612115Sdyson VREF(vdp); 57712115Sdyson *vpp = vdp; 57812115Sdyson return (0); 57912115Sdyson } 580202283Slulf if ((error = VFS_VGET(vdp->v_mount, ino, LK_EXCLUSIVE, 58192462Smckusick &tdp)) != 0) 58212115Sdyson return (error); 58312115Sdyson /* 58412115Sdyson * If directory is "sticky", then user must own 58512115Sdyson * the directory, or the file in it, else she 58612115Sdyson * may not delete it (unless she's root). This 58712115Sdyson * implements append-only directories. 58812115Sdyson */ 58912115Sdyson if ((dp->i_mode & ISVTX) && 59012115Sdyson cred->cr_uid != 0 && 59112115Sdyson cred->cr_uid != dp->i_uid && 59212115Sdyson VTOI(tdp)->i_uid != cred->cr_uid) { 59312115Sdyson vput(tdp); 59412115Sdyson return (EPERM); 59512115Sdyson } 59612115Sdyson *vpp = tdp; 59712115Sdyson return (0); 59812115Sdyson } 59912115Sdyson 60012115Sdyson /* 60112115Sdyson * If rewriting (RENAME), return the inode and the 60212115Sdyson * information required to rewrite the present directory 60312115Sdyson * Must get inode of directory entry to verify it's a 60412115Sdyson * regular file, or empty directory. 60512115Sdyson */ 606144299Sjeff if (nameiop == RENAME && (flags & ISLASTCN)) { 60783366Sjulian if ((error = VOP_ACCESS(vdp, VWRITE, cred, cnp->cn_thread)) != 0) 60812115Sdyson return (error); 60912115Sdyson /* 61012115Sdyson * Careful about locking second inode. 61112115Sdyson * This can only occur if the target is ".". 61212115Sdyson */ 613252677Spfg dp->i_offset = i_offset; 614202283Slulf if (dp->i_number == ino) 61512115Sdyson return (EISDIR); 616235820Spfg if (dd_ino != NULL) 617235820Spfg return (0); 618202283Slulf if ((error = VFS_VGET(vdp->v_mount, ino, LK_EXCLUSIVE, 61992462Smckusick &tdp)) != 0) 62012115Sdyson return (error); 62112115Sdyson *vpp = tdp; 62212115Sdyson cnp->cn_flags |= SAVENAME; 62312115Sdyson return (0); 62412115Sdyson } 625235820Spfg if (dd_ino != NULL) 626235820Spfg return (0); 62712115Sdyson 62812115Sdyson /* 62912115Sdyson * Step through the translation in the name. We do not `vput' the 63012115Sdyson * directory because we may need it again if a symbolic link 63112115Sdyson * is relative to the current directory. Instead we save it 63212115Sdyson * unlocked as "pdp". We must get the target inode before unlocking 63312115Sdyson * the directory to insure that the inode will not be removed 63412115Sdyson * before we get it. We prevent deadlock by always fetching 63512115Sdyson * inodes from the root, moving down the directory tree. Thus 63612115Sdyson * when following backward pointers ".." we must unlock the 63712115Sdyson * parent directory before getting the requested directory. 63812115Sdyson * There is a potential race condition here if both the current 63912115Sdyson * and parent directories are removed before the VFS_VGET for the 64012115Sdyson * inode associated with ".." returns. We hope that this occurs 64112115Sdyson * infrequently since we cannot avoid this race condition without 64212115Sdyson * implementing a sophisticated deadlock detection algorithm. 64312115Sdyson * Note also that this simple deadlock detection scheme will not 64412115Sdyson * work if the file system has any hard links other than ".." 64512115Sdyson * that point backwards in the directory structure. 64612115Sdyson */ 64712115Sdyson pdp = vdp; 64812115Sdyson if (flags & ISDOTDOT) { 649252677Spfg error = vn_vget_ino(pdp, ino, cnp->cn_lkflags, &tdp); 650235820Spfg if (pdp->v_iflag & VI_DOOMED) { 651235820Spfg if (error == 0) 652235820Spfg vput(tdp); 653235820Spfg error = ENOENT; 654235820Spfg } 655235820Spfg if (error) 65612115Sdyson return (error); 657235820Spfg /* 658235820Spfg * Recheck that ".." entry in the vdp directory points 659235820Spfg * to the inode we looked up before vdp lock was 660235820Spfg * dropped. 661235820Spfg */ 662235820Spfg error = ext2_lookup_ino(pdp, NULL, cnp, &ino1); 663235820Spfg if (error) { 664235820Spfg vput(tdp); 665235820Spfg return (error); 666235820Spfg } 667235820Spfg if (ino1 != ino) { 668235820Spfg vput(tdp); 669235820Spfg goto restart; 670235820Spfg } 67112115Sdyson *vpp = tdp; 672202283Slulf } else if (dp->i_number == ino) { 67312115Sdyson VREF(vdp); /* we want ourself, ie "." */ 674202283Slulf /* 675202283Slulf * When we lookup "." we still can be asked to lock it 676202283Slulf * differently. 677202283Slulf */ 678202283Slulf ltype = cnp->cn_lkflags & LK_TYPE_MASK; 679202283Slulf if (ltype != VOP_ISLOCKED(vdp)) { 680202283Slulf if (ltype == LK_EXCLUSIVE) 681202283Slulf vn_lock(vdp, LK_UPGRADE | LK_RETRY); 682202283Slulf else /* if (ltype == LK_SHARED) */ 683202283Slulf vn_lock(vdp, LK_DOWNGRADE | LK_RETRY); 684202283Slulf } 68512115Sdyson *vpp = vdp; 68612115Sdyson } else { 687202283Slulf if ((error = VFS_VGET(vdp->v_mount, ino, cnp->cn_lkflags, 68892462Smckusick &tdp)) != 0) 68912115Sdyson return (error); 69012115Sdyson *vpp = tdp; 69112115Sdyson } 69212115Sdyson 69312115Sdyson /* 69412115Sdyson * Insert name into cache if appropriate. 69512115Sdyson */ 69612115Sdyson if (cnp->cn_flags & MAKEENTRY) 69712115Sdyson cache_enter(vdp, *vpp, cnp); 69812115Sdyson return (0); 69912115Sdyson} 70012115Sdyson 701254205Spfgint 702254205Spfgext2_search_dirblock(struct inode *ip, void *data, int *foundp, 703254205Spfg const char *name, int namelen, int *entryoffsetinblockp, 704254205Spfg doff_t *offp, doff_t *prevoffp, doff_t *endusefulp, 705254205Spfg struct ext2fs_searchslot *ssp) 706254205Spfg{ 707254205Spfg struct vnode *vdp; 708254205Spfg struct ext2fs_direct_2 *ep, *top; 709254205Spfg uint32_t bsize = ip->i_e2fs->e2fs_bsize; 710254205Spfg int offset = *entryoffsetinblockp; 711254205Spfg int namlen; 712254205Spfg 713254205Spfg vdp = ITOV(ip); 714254205Spfg 715254205Spfg ep = (struct ext2fs_direct_2 *)((char *)data + offset); 716254205Spfg top = (struct ext2fs_direct_2 *)((char *)data + 717254205Spfg bsize - EXT2_DIR_REC_LEN(0)); 718254205Spfg 719254205Spfg while (ep < top) { 720254205Spfg /* 721254205Spfg * Full validation checks are slow, so we only check 722254205Spfg * enough to insure forward progress through the 723254205Spfg * directory. Complete checks can be run by setting 724254205Spfg * "vfs.e2fs.dirchk" to be true. 725254205Spfg */ 726254205Spfg if (ep->e2d_reclen == 0 || 727254205Spfg (dirchk && ext2_dirbadentry(vdp, ep, offset))) { 728254205Spfg int i; 729254205Spfg ext2_dirbad(ip, *offp, "mangled entry"); 730254205Spfg i = bsize - (offset & (bsize - 1)); 731254205Spfg *offp += i; 732254205Spfg offset += i; 733254205Spfg continue; 734254205Spfg } 735254205Spfg 736254205Spfg /* 737254205Spfg * If an appropriate sized slot has not yet been found, 738254205Spfg * check to see if one is available. Also accumulate space 739254205Spfg * in the current block so that we can determine if 740254205Spfg * compaction is viable. 741254205Spfg */ 742254205Spfg if (ssp->slotstatus != FOUND) { 743254205Spfg int size = ep->e2d_reclen; 744254205Spfg 745254205Spfg if (ep->e2d_ino != 0) 746254205Spfg size -= EXT2_DIR_REC_LEN(ep->e2d_namlen); 747254205Spfg if (size > 0) { 748254205Spfg if (size >= ssp->slotneeded) { 749254205Spfg ssp->slotstatus = FOUND; 750254205Spfg ssp->slotoffset = *offp; 751254205Spfg ssp->slotsize = ep->e2d_reclen; 752254205Spfg } else if (ssp->slotstatus == NONE) { 753254205Spfg ssp->slotfreespace += size; 754254205Spfg if (ssp->slotoffset == -1) 755254205Spfg ssp->slotoffset = *offp; 756254205Spfg if (ssp->slotfreespace >= ssp->slotneeded) { 757254205Spfg ssp->slotstatus = COMPACT; 758254205Spfg ssp->slotsize = *offp + 759254205Spfg ep->e2d_reclen - 760254205Spfg ssp->slotoffset; 761254205Spfg } 762254205Spfg } 763254205Spfg } 764254205Spfg } 765254205Spfg 766254205Spfg /* 767254205Spfg * Check for a name match. 768254205Spfg */ 769254205Spfg if (ep->e2d_ino) { 770254205Spfg namlen = ep->e2d_namlen; 771254205Spfg if (namlen == namelen && 772254205Spfg !bcmp(name, ep->e2d_name, (unsigned)namlen)) { 773254205Spfg /* 774254205Spfg * Save directory entry's inode number and 775254205Spfg * reclen in ndp->ni_ufs area, and release 776254205Spfg * directory buffer. 777254205Spfg */ 778254205Spfg *foundp = 1; 779254205Spfg return (0); 780254205Spfg } 781254205Spfg } 782254205Spfg *prevoffp = *offp; 783254205Spfg *offp += ep->e2d_reclen; 784254205Spfg offset += ep->e2d_reclen; 785254205Spfg *entryoffsetinblockp = offset; 786254205Spfg if (ep->e2d_ino) 787254205Spfg *endusefulp = *offp; 788254205Spfg /* 789254205Spfg * Get pointer to the next entry. 790254205Spfg */ 791254205Spfg ep = (struct ext2fs_direct_2 *)((char *)data + offset); 792254205Spfg } 793254205Spfg 794254205Spfg return (0); 795254205Spfg} 796254205Spfg 79796749Siedowsevoid 798247209Spfgext2_dirbad(struct inode *ip, doff_t offset, char *how) 79996749Siedowse{ 80096749Siedowse struct mount *mp; 80196749Siedowse 80296749Siedowse mp = ITOV(ip)->v_mount; 803202283Slulf if ((mp->mnt_flag & MNT_RDONLY) == 0) 804202283Slulf panic("ext2_dirbad: %s: bad dir ino %lu at offset %ld: %s\n", 805202283Slulf mp->mnt_stat.f_mntonname, (u_long)ip->i_number,(long)offset, how); 806202283Slulf else 80796749Siedowse (void)printf("%s: bad dir ino %lu at offset %ld: %s\n", 808262724Spfg mp->mnt_stat.f_mntonname, (u_long)ip->i_number, (long)offset, how); 809202283Slulf 81096749Siedowse} 81196749Siedowse 81212115Sdyson/* 81312115Sdyson * Do consistency checking on a directory entry: 81412115Sdyson * record length must be multiple of 4 81512115Sdyson * entry must fit in rest of its DIRBLKSIZ block 81612115Sdyson * record must be large enough to contain entry 81712115Sdyson * name is not longer than MAXNAMLEN 81812115Sdyson * name must be as long as advertised, and null terminated 81912115Sdyson */ 82012115Sdyson/* 82112115Sdyson * changed so that it confirms to ext2_check_dir_entry 82212115Sdyson */ 82312159Sbdestatic int 824247209Spfgext2_dirbadentry(struct vnode *dp, struct ext2fs_direct_2 *de, 825247209Spfg int entryoffsetinblock) 82612115Sdyson{ 827202283Slulf int DIRBLKSIZ = VTOI(dp)->i_e2fs->e2fs_bsize; 82812115Sdyson 829111742Sdes char * error_msg = NULL; 83012115Sdyson 831202283Slulf if (de->e2d_reclen < EXT2_DIR_REC_LEN(1)) 832111742Sdes error_msg = "rec_len is smaller than minimal"; 833202283Slulf else if (de->e2d_reclen % 4 != 0) 834111742Sdes error_msg = "rec_len % 4 != 0"; 835202283Slulf else if (de->e2d_reclen < EXT2_DIR_REC_LEN(de->e2d_namlen)) 836111742Sdes error_msg = "reclen is too small for name_len"; 837202283Slulf else if (entryoffsetinblock + de->e2d_reclen > DIRBLKSIZ) 838111742Sdes error_msg = "directory entry across blocks"; 839111742Sdes /* else LATER 84012115Sdyson if (de->inode > dir->i_sb->u.ext2_sb.s_es->s_inodes_count) 841111742Sdes error_msg = "inode out of bounds"; 84212115Sdyson */ 84312115Sdyson 844111742Sdes if (error_msg != NULL) { 845111742Sdes printf("bad directory entry: %s\n", error_msg); 846111742Sdes printf("offset=%d, inode=%lu, rec_len=%u, name_len=%u\n", 847202283Slulf entryoffsetinblock, (unsigned long)de->e2d_ino, 848202283Slulf de->e2d_reclen, de->e2d_namlen); 849111742Sdes } 850111742Sdes return error_msg == NULL ? 0 : 1; 85112115Sdyson} 85212115Sdyson 85312115Sdyson/* 85412115Sdyson * Write a directory entry after a call to namei, using the parameters 85512115Sdyson * that it left in nameidata. The argument ip is the inode which the new 85612115Sdyson * directory entry will refer to. Dvp is a pointer to the directory to 85712115Sdyson * be written, which was left locked by namei. Remaining parameters 85812115Sdyson * (dp->i_offset, dp->i_count) indicate how the space for the new 85912115Sdyson * entry is to be obtained. 86012115Sdyson */ 86112115Sdysonint 862247209Spfgext2_direnter(struct inode *ip, struct vnode *dvp, struct componentname *cnp) 86312115Sdyson{ 86496752Siedowse struct inode *dp; 865202283Slulf struct ext2fs_direct_2 newdir; 86612115Sdyson struct iovec aiov; 86712115Sdyson struct uio auio; 868254205Spfg int error, newentrysize; 869254205Spfg int DIRBLKSIZ = ip->i_e2fs->e2fs_bsize; 87012115Sdyson 87112115Sdyson 872252008Spfg#ifdef INVARIANTS 87312115Sdyson if ((cnp->cn_flags & SAVENAME) == 0) 874246892Spfg panic("ext2_direnter: missing name"); 87512115Sdyson#endif 87612115Sdyson dp = VTOI(dvp); 877202283Slulf newdir.e2d_ino = ip->i_number; 878202283Slulf newdir.e2d_namlen = cnp->cn_namelen; 879193377Sstas if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 880202283Slulf EXT2F_INCOMPAT_FTYPE)) 881202283Slulf newdir.e2d_type = DTTOFT(IFTODT(ip->i_mode)); 88255477Sbde else 883202283Slulf newdir.e2d_type = EXT2_FT_UNKNOWN; 884202283Slulf bcopy(cnp->cn_nameptr, newdir.e2d_name, (unsigned)cnp->cn_namelen + 1); 885202283Slulf newentrysize = EXT2_DIR_REC_LEN(newdir.e2d_namlen); 886254205Spfg 887254205Spfg if (ext2_htree_has_idx(dp)) { 888254205Spfg error = ext2_htree_add_entry(dvp, &newdir, cnp); 889254205Spfg if (error) { 890261312Spfg dp->i_flag &= ~IN_E4INDEX; 891261312Spfg dp->i_flag |= IN_CHANGE | IN_UPDATE; 892254205Spfg } 893254205Spfg return (error); 894254205Spfg } 895254205Spfg 896254205Spfg if (EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_DIRHASHINDEX) && 897254205Spfg !ext2_htree_has_idx(dp)) { 898254205Spfg if ((dp->i_size / DIRBLKSIZ) == 1 && 899254205Spfg dp->i_offset == DIRBLKSIZ) { 900254205Spfg /* 901254205Spfg * Making indexed directory when one block is not 902254205Spfg * enough to save all entries. 903254205Spfg */ 904254205Spfg return ext2_htree_create_index(dvp, cnp, &newdir); 905254205Spfg } 906254205Spfg } 907254205Spfg 90812115Sdyson if (dp->i_count == 0) { 90912115Sdyson /* 91012115Sdyson * If dp->i_count is 0, then namei could find no 91112115Sdyson * space in the directory. Here, dp->i_offset will 91212115Sdyson * be on a directory block boundary and we will write the 91312115Sdyson * new entry into a fresh block. 91412115Sdyson */ 91512115Sdyson if (dp->i_offset & (DIRBLKSIZ - 1)) 91612115Sdyson panic("ext2_direnter: newblk"); 91712115Sdyson auio.uio_offset = dp->i_offset; 918202283Slulf newdir.e2d_reclen = DIRBLKSIZ; 91912115Sdyson auio.uio_resid = newentrysize; 92012115Sdyson aiov.iov_len = newentrysize; 92112115Sdyson aiov.iov_base = (caddr_t)&newdir; 92212115Sdyson auio.uio_iov = &aiov; 92312115Sdyson auio.uio_iovcnt = 1; 92412115Sdyson auio.uio_rw = UIO_WRITE; 92512115Sdyson auio.uio_segflg = UIO_SYSSPACE; 92683366Sjulian auio.uio_td = (struct thread *)0; 92712115Sdyson error = VOP_WRITE(dvp, &auio, IO_SYNC, cnp->cn_cred); 92812115Sdyson if (DIRBLKSIZ > 92996749Siedowse VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize) 93012115Sdyson /* XXX should grow with balloc() */ 93112115Sdyson panic("ext2_direnter: frag size"); 93212115Sdyson else if (!error) { 933202283Slulf dp->i_size = roundup2(dp->i_size, DIRBLKSIZ); 93412115Sdyson dp->i_flag |= IN_CHANGE; 93512115Sdyson } 93612115Sdyson return (error); 93712115Sdyson } 93812115Sdyson 939254205Spfg error = ext2_add_entry(dvp, &newdir); 940254205Spfg if (!error && dp->i_endoff && dp->i_endoff < dp->i_size) 941254205Spfg error = ext2_truncate(dvp, (off_t)dp->i_endoff, IO_SYNC, 942254205Spfg cnp->cn_cred, cnp->cn_thread); 943254205Spfg return (error); 944254205Spfg} 945254205Spfg 946254205Spfg/* 947254205Spfg * Insert an entry into the directory block. 948254205Spfg * Compact the contents. 949254205Spfg */ 950254205Spfgint 951254205Spfgext2_add_entry(struct vnode *dvp, struct ext2fs_direct_2 *entry) 952254205Spfg{ 953254205Spfg struct ext2fs_direct_2 *ep, *nep; 954254205Spfg struct inode *dp; 955254205Spfg struct buf *bp; 956254205Spfg u_int dsize; 957254205Spfg int error, loc, newentrysize, spacefree; 958254205Spfg char *dirbuf; 959254205Spfg 960254205Spfg dp = VTOI(dvp); 961254205Spfg 96212115Sdyson /* 96312115Sdyson * If dp->i_count is non-zero, then namei found space 96412115Sdyson * for the new entry in the range dp->i_offset to 96512115Sdyson * dp->i_offset + dp->i_count in the directory. 96612115Sdyson * To use this space, we may have to compact the entries located 96712115Sdyson * there, by copying them together towards the beginning of the 96812115Sdyson * block, leaving the free space in one usable chunk at the end. 96912115Sdyson */ 97012115Sdyson 97112115Sdyson /* 97212115Sdyson * Increase size of directory if entry eats into new space. 97312115Sdyson * This should never push the size past a new multiple of 97412115Sdyson * DIRBLKSIZE. 97512115Sdyson * 97612115Sdyson * N.B. - THIS IS AN ARTIFACT OF 4.2 AND SHOULD NEVER HAPPEN. 97712115Sdyson */ 97812115Sdyson if (dp->i_offset + dp->i_count > dp->i_size) 97912115Sdyson dp->i_size = dp->i_offset + dp->i_count; 98012115Sdyson /* 98112115Sdyson * Get the block containing the space for the new directory entry. 98212115Sdyson */ 98396749Siedowse if ((error = ext2_blkatoff(dvp, (off_t)dp->i_offset, &dirbuf, 98496749Siedowse &bp)) != 0) 98512115Sdyson return (error); 98612115Sdyson /* 98712115Sdyson * Find space for the new entry. In the simple case, the entry at 98812115Sdyson * offset base will have the space. If it does not, then namei 98912115Sdyson * arranged that compacting the region dp->i_offset to 99012115Sdyson * dp->i_offset + dp->i_count would yield the 99112115Sdyson * space. 99212115Sdyson */ 993254205Spfg newentrysize = EXT2_DIR_REC_LEN(entry->e2d_namlen); 994202283Slulf ep = (struct ext2fs_direct_2 *)dirbuf; 995202283Slulf dsize = EXT2_DIR_REC_LEN(ep->e2d_namlen); 996202283Slulf spacefree = ep->e2d_reclen - dsize; 997202283Slulf for (loc = ep->e2d_reclen; loc < dp->i_count; ) { 998202283Slulf nep = (struct ext2fs_direct_2 *)(dirbuf + loc); 999202283Slulf if (ep->e2d_ino) { 100012115Sdyson /* trim the existing slot */ 1001202283Slulf ep->e2d_reclen = dsize; 1002202283Slulf ep = (struct ext2fs_direct_2 *)((char *)ep + dsize); 100312115Sdyson } else { 100412115Sdyson /* overwrite; nothing there; header is ours */ 100512115Sdyson spacefree += dsize; 100612115Sdyson } 1007202283Slulf dsize = EXT2_DIR_REC_LEN(nep->e2d_namlen); 1008202283Slulf spacefree += nep->e2d_reclen - dsize; 1009202283Slulf loc += nep->e2d_reclen; 101012115Sdyson bcopy((caddr_t)nep, (caddr_t)ep, dsize); 101112115Sdyson } 101212115Sdyson /* 101312115Sdyson * Update the pointer fields in the previous entry (if any), 101412115Sdyson * copy in the new entry, and write out the block. 101512115Sdyson */ 1016202283Slulf if (ep->e2d_ino == 0) { 101712115Sdyson if (spacefree + dsize < newentrysize) 101812115Sdyson panic("ext2_direnter: compact1"); 1019254205Spfg entry->e2d_reclen = spacefree + dsize; 102012115Sdyson } else { 102112115Sdyson if (spacefree < newentrysize) 102212115Sdyson panic("ext2_direnter: compact2"); 1023254205Spfg entry->e2d_reclen = spacefree; 1024202283Slulf ep->e2d_reclen = dsize; 1025202283Slulf ep = (struct ext2fs_direct_2 *)((char *)ep + dsize); 102612115Sdyson } 1027254205Spfg bcopy((caddr_t)entry, (caddr_t)ep, (u_int)newentrysize); 1028221166Sjhb if (DOINGASYNC(dvp)) { 1029221166Sjhb bdwrite(bp); 1030221166Sjhb error = 0; 1031221166Sjhb } else { 1032221166Sjhb error = bwrite(bp); 1033221166Sjhb } 103412115Sdyson dp->i_flag |= IN_CHANGE | IN_UPDATE; 103512115Sdyson return (error); 103612115Sdyson} 103712115Sdyson 103812115Sdyson/* 103912115Sdyson * Remove a directory entry after a call to namei, using 104012115Sdyson * the parameters which it left in nameidata. The entry 104112115Sdyson * dp->i_offset contains the offset into the directory of the 104212115Sdyson * entry to be eliminated. The dp->i_count field contains the 104312115Sdyson * size of the previous record in the directory. If this 104412115Sdyson * is 0, the first entry is being deleted, so we need only 104512115Sdyson * zero the inode number to mark the entry as free. If the 104612115Sdyson * entry is not the first in the directory, we must reclaim 104712115Sdyson * the space of the now empty record by adding the record size 104812115Sdyson * to the size of the previous entry. 104912115Sdyson */ 105012115Sdysonint 1051247209Spfgext2_dirremove(struct vnode *dvp, struct componentname *cnp) 105212115Sdyson{ 105396752Siedowse struct inode *dp; 1054202283Slulf struct ext2fs_direct_2 *ep, *rep; 105512115Sdyson struct buf *bp; 105612115Sdyson int error; 1057111742Sdes 105812115Sdyson dp = VTOI(dvp); 105912115Sdyson if (dp->i_count == 0) { 106012115Sdyson /* 106112115Sdyson * First entry in block: set d_ino to zero. 106212115Sdyson */ 106343301Sdillon if ((error = 106496749Siedowse ext2_blkatoff(dvp, (off_t)dp->i_offset, (char **)&ep, 106596749Siedowse &bp)) != 0) 106612115Sdyson return (error); 1067202283Slulf ep->e2d_ino = 0; 1068126853Sphk error = bwrite(bp); 106912115Sdyson dp->i_flag |= IN_CHANGE | IN_UPDATE; 107012115Sdyson return (error); 107112115Sdyson } 107212115Sdyson /* 107312115Sdyson * Collapse new free space into previous entry. 107412115Sdyson */ 107596749Siedowse if ((error = ext2_blkatoff(dvp, (off_t)(dp->i_offset - dp->i_count), 107643301Sdillon (char **)&ep, &bp)) != 0) 107712115Sdyson return (error); 1078202283Slulf 1079202283Slulf /* Set 'rep' to the entry being removed. */ 1080202283Slulf if (dp->i_count == 0) 1081202283Slulf rep = ep; 1082202283Slulf else 1083202283Slulf rep = (struct ext2fs_direct_2 *)((char *)ep + ep->e2d_reclen); 1084202283Slulf ep->e2d_reclen += rep->e2d_reclen; 1085221166Sjhb if (DOINGASYNC(dvp) && dp->i_count != 0) 1086221166Sjhb bdwrite(bp); 1087221166Sjhb else 1088221166Sjhb error = bwrite(bp); 108912115Sdyson dp->i_flag |= IN_CHANGE | IN_UPDATE; 109012115Sdyson return (error); 109112115Sdyson} 109212115Sdyson 109312115Sdyson/* 109412115Sdyson * Rewrite an existing directory entry to point at the inode 109512115Sdyson * supplied. The parameters describing the directory entry are 109612115Sdyson * set up by a call to namei. 109712115Sdyson */ 109812115Sdysonint 1099247209Spfgext2_dirrewrite(struct inode *dp, struct inode *ip, struct componentname *cnp) 110012115Sdyson{ 110112115Sdyson struct buf *bp; 1102202283Slulf struct ext2fs_direct_2 *ep; 110312115Sdyson struct vnode *vdp = ITOV(dp); 110412115Sdyson int error; 110512115Sdyson 110696749Siedowse if ((error = ext2_blkatoff(vdp, (off_t)dp->i_offset, (char **)&ep, 110796749Siedowse &bp)) != 0) 110812115Sdyson return (error); 1109202283Slulf ep->e2d_ino = ip->i_number; 1110193377Sstas if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs, 1111202283Slulf EXT2F_INCOMPAT_FTYPE)) 1112202283Slulf ep->e2d_type = DTTOFT(IFTODT(ip->i_mode)); 111355477Sbde else 1114202283Slulf ep->e2d_type = EXT2_FT_UNKNOWN; 1115126853Sphk error = bwrite(bp); 111612115Sdyson dp->i_flag |= IN_CHANGE | IN_UPDATE; 111712115Sdyson return (error); 111812115Sdyson} 111912115Sdyson 112012115Sdyson/* 112112115Sdyson * Check if a directory is empty or not. 112212115Sdyson * Inode supplied must be locked. 112312115Sdyson * 112412115Sdyson * Using a struct dirtemplate here is not precisely 112512115Sdyson * what we want, but better than using a struct direct. 112612115Sdyson * 112712115Sdyson * NB: does not handle corrupted directories. 112812115Sdyson */ 112912115Sdysonint 1130247209Spfgext2_dirempty(struct inode *ip, ino_t parentino, struct ucred *cred) 113112115Sdyson{ 113296752Siedowse off_t off; 113312115Sdyson struct dirtemplate dbuf; 1134202283Slulf struct ext2fs_direct_2 *dp = (struct ext2fs_direct_2 *)&dbuf; 1135233353Skib int error, namlen; 1136233353Skib ssize_t count; 1137229549Spfg#define MINDIRSIZ (sizeof(struct dirtemplate) / 2) 113812115Sdyson 1139202283Slulf for (off = 0; off < ip->i_size; off += dp->e2d_reclen) { 1140101744Srwatson error = vn_rdwr(UIO_READ, ITOV(ip), (caddr_t)dp, MINDIRSIZ, 1141101744Srwatson off, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, cred, 1142101941Srwatson NOCRED, &count, (struct thread *)0); 114312115Sdyson /* 114412115Sdyson * Since we read MINDIRSIZ, residual must 114512115Sdyson * be 0 unless we're at end of file. 114612115Sdyson */ 114712115Sdyson if (error || count != 0) 114812115Sdyson return (0); 114912115Sdyson /* avoid infinite loops */ 1150202283Slulf if (dp->e2d_reclen == 0) 115112115Sdyson return (0); 115212115Sdyson /* skip empty entries */ 1153202283Slulf if (dp->e2d_ino == 0) 115412115Sdyson continue; 115512115Sdyson /* accept only "." and ".." */ 1156202283Slulf namlen = dp->e2d_namlen; 115712115Sdyson if (namlen > 2) 115812115Sdyson return (0); 1159202283Slulf if (dp->e2d_name[0] != '.') 116012115Sdyson return (0); 116112115Sdyson /* 116212115Sdyson * At this point namlen must be 1 or 2. 116312115Sdyson * 1 implies ".", 2 implies ".." if second 116412115Sdyson * char is also "." 116512115Sdyson */ 116612115Sdyson if (namlen == 1) 116712115Sdyson continue; 1168202283Slulf if (dp->e2d_name[1] == '.' && dp->e2d_ino == parentino) 116912115Sdyson continue; 117012115Sdyson return (0); 117112115Sdyson } 117212115Sdyson return (1); 117312115Sdyson} 117412115Sdyson 117512115Sdyson/* 117612115Sdyson * Check if source directory is in the path of the target directory. 117712115Sdyson * Target is supplied locked, source is unlocked. 117812115Sdyson * The target is always vput before returning. 117912115Sdyson */ 118012115Sdysonint 1181247209Spfgext2_checkpath(struct inode *source, struct inode *target, struct ucred *cred) 118212115Sdyson{ 118312115Sdyson struct vnode *vp; 1184247055Spfg int error, namlen; 118512115Sdyson struct dirtemplate dirbuf; 118612115Sdyson 118712115Sdyson vp = ITOV(target); 118812115Sdyson if (target->i_number == source->i_number) { 118912115Sdyson error = EEXIST; 119012115Sdyson goto out; 119112115Sdyson } 1192247055Spfg if (target->i_number == EXT2_ROOTINO) { 1193247055Spfg error = 0; 119412115Sdyson goto out; 1195247055Spfg } 119612115Sdyson 119712115Sdyson for (;;) { 119812115Sdyson if (vp->v_type != VDIR) { 119912115Sdyson error = ENOTDIR; 120012115Sdyson break; 120112115Sdyson } 120212115Sdyson error = vn_rdwr(UIO_READ, vp, (caddr_t)&dirbuf, 1203229549Spfg sizeof(struct dirtemplate), (off_t)0, UIO_SYSSPACE, 1204194296Skib IO_NODELOCKED | IO_NOMACCHECK, cred, NOCRED, NULL, 1205194296Skib NULL); 120612115Sdyson if (error != 0) 120712115Sdyson break; 120857710Sbde namlen = dirbuf.dotdot_type; /* like ufs little-endian */ 120912115Sdyson if (namlen != 2 || 121012115Sdyson dirbuf.dotdot_name[0] != '.' || 121112115Sdyson dirbuf.dotdot_name[1] != '.') { 121212115Sdyson error = ENOTDIR; 121312115Sdyson break; 121412115Sdyson } 121512115Sdyson if (dirbuf.dotdot_ino == source->i_number) { 121612115Sdyson error = EINVAL; 121712115Sdyson break; 121812115Sdyson } 1219247055Spfg if (dirbuf.dotdot_ino == EXT2_ROOTINO) 122012115Sdyson break; 122112115Sdyson vput(vp); 122292462Smckusick if ((error = VFS_VGET(vp->v_mount, dirbuf.dotdot_ino, 122392462Smckusick LK_EXCLUSIVE, &vp)) != 0) { 122412115Sdyson vp = NULL; 122512115Sdyson break; 122612115Sdyson } 122712115Sdyson } 122812115Sdyson 122912115Sdysonout: 123012115Sdyson if (error == ENOTDIR) 123112115Sdyson printf("checkpath: .. not a directory\n"); 123212115Sdyson if (vp != NULL) 123312115Sdyson vput(vp); 123412115Sdyson return (error); 123512115Sdyson} 1236