The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_lookup.c

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    1 /*-
    2  *  modified for Lites 1.1
    3  *
    4  *  Aug 1995, Godmar Back (gback@cs.utah.edu)
    5  *  University of Utah, Department of Computer Science
    6  */
    7 /*-
    8  * Copyright (c) 1989, 1993
    9  *      The Regents of the University of California.  All rights reserved.
   10  * (c) UNIX System Laboratories, Inc.
   11  * All or some portions of this file are derived from material licensed
   12  * to the University of California by American Telephone and Telegraph
   13  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   14  * the permission of UNIX System Laboratories, Inc.
   15  *
   16  * Redistribution and use in source and binary forms, with or without
   17  * modification, are permitted provided that the following conditions
   18  * are met:
   19  * 1. Redistributions of source code must retain the above copyright
   20  *    notice, this list of conditions and the following disclaimer.
   21  * 2. Redistributions in binary form must reproduce the above copyright
   22  *    notice, this list of conditions and the following disclaimer in the
   23  *    documentation and/or other materials provided with the distribution.
   24  * 4. Neither the name of the University nor the names of its contributors
   25  *    may be used to endorse or promote products derived from this software
   26  *    without specific prior written permission.
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   38  * SUCH DAMAGE.
   39  *
   40  *      @(#)ufs_lookup.c        8.6 (Berkeley) 4/1/94
   41  * $FreeBSD: releng/9.0/sys/fs/ext2fs/ext2_lookup.c 221867 2011-05-14 01:10:57Z jhb $
   42  */
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/namei.h>
   47 #include <sys/bio.h>
   48 #include <sys/buf.h>
   49 #include <sys/endian.h>
   50 #include <sys/mount.h>
   51 #include <sys/vnode.h>
   52 #include <sys/malloc.h>
   53 #include <sys/dirent.h>
   54 #include <sys/sysctl.h>
   55 
   56 #include <ufs/ufs/dir.h>
   57 
   58 #include <fs/ext2fs/inode.h>
   59 #include <fs/ext2fs/ext2_mount.h>
   60 #include <fs/ext2fs/ext2fs.h>
   61 #include <fs/ext2fs/ext2_dinode.h>
   62 #include <fs/ext2fs/ext2_dir.h>
   63 #include <fs/ext2fs/ext2_extern.h>
   64 
   65 #ifdef DIAGNOSTIC
   66 static int dirchk = 1;
   67 #else
   68 static int dirchk = 0;
   69 #endif
   70 
   71 static SYSCTL_NODE(_vfs, OID_AUTO, e2fs, CTLFLAG_RD, 0, "EXT2FS filesystem");
   72 SYSCTL_INT(_vfs_e2fs, OID_AUTO, dircheck, CTLFLAG_RW, &dirchk, 0, "");
   73 
   74 /*
   75    DIRBLKSIZE in ffs is DEV_BSIZE (in most cases 512)
   76    while it is the native blocksize in ext2fs - thus, a #define
   77    is no longer appropriate
   78 */
   79 #undef  DIRBLKSIZ
   80 
   81 static u_char ext2_ft_to_dt[] = {
   82         DT_UNKNOWN,             /* EXT2_FT_UNKNOWN */
   83         DT_REG,                 /* EXT2_FT_REG_FILE */
   84         DT_DIR,                 /* EXT2_FT_DIR */
   85         DT_CHR,                 /* EXT2_FT_CHRDEV */
   86         DT_BLK,                 /* EXT2_FT_BLKDEV */
   87         DT_FIFO,                /* EXT2_FT_FIFO */
   88         DT_SOCK,                /* EXT2_FT_SOCK */
   89         DT_LNK,                 /* EXT2_FT_SYMLINK */
   90 };
   91 #define FTTODT(ft)                                              \
   92     ((ft) > sizeof(ext2_ft_to_dt) / sizeof(ext2_ft_to_dt[0]) ?  \
   93     DT_UNKNOWN : ext2_ft_to_dt[(ft)])
   94 
   95 static u_char dt_to_ext2_ft[] = {
   96         EXT2_FT_UNKNOWN,        /* DT_UNKNOWN */
   97         EXT2_FT_FIFO,           /* DT_FIFO */
   98         EXT2_FT_CHRDEV,         /* DT_CHR */
   99         EXT2_FT_UNKNOWN,        /* unused */
  100         EXT2_FT_DIR,            /* DT_DIR */
  101         EXT2_FT_UNKNOWN,        /* unused */
  102         EXT2_FT_BLKDEV,         /* DT_BLK */
  103         EXT2_FT_UNKNOWN,        /* unused */
  104         EXT2_FT_REG_FILE,       /* DT_REG */
  105         EXT2_FT_UNKNOWN,        /* unused */
  106         EXT2_FT_SYMLINK,        /* DT_LNK */
  107         EXT2_FT_UNKNOWN,        /* unused */
  108         EXT2_FT_SOCK,           /* DT_SOCK */
  109         EXT2_FT_UNKNOWN,        /* unused */
  110         EXT2_FT_UNKNOWN,        /* DT_WHT */
  111 };
  112 #define DTTOFT(dt)                                              \
  113     ((dt) > sizeof(dt_to_ext2_ft) / sizeof(dt_to_ext2_ft[0]) ?  \
  114     EXT2_FT_UNKNOWN : dt_to_ext2_ft[(dt)])
  115 
  116 static int      ext2_dirbadentry(struct vnode *dp, struct ext2fs_direct_2 *de,
  117                     int entryoffsetinblock);
  118 
  119 /*
  120  * Vnode op for reading directories.
  121  *
  122  * This function has to convert directory entries from the on-disk
  123  * format to the format defined by <sys/dirent.h>.  Unfortunately, the
  124  * conversion will blow up some entries by four bytes, so it can't be
  125  * done in place.  Instead, the conversion is done entry by entry and
  126  * the converted entry is sent via uiomove.
  127  *
  128  * XXX allocate a buffer, convert as many entries as possible, then send
  129  * the whole buffer to uiomove
  130  */
  131 int
  132 ext2_readdir(ap)
  133         struct vop_readdir_args /* {
  134                 struct vnode *a_vp;
  135                 struct uio *a_uio;
  136                 struct ucred *a_cred;
  137         } */ *ap;
  138 {
  139         struct uio *uio = ap->a_uio;
  140         int count, error;
  141 
  142         struct ext2fs_direct_2 *edp, *dp;
  143         int ncookies;
  144         struct dirent dstdp;
  145         struct uio auio;
  146         struct iovec aiov;
  147         caddr_t dirbuf;
  148         int DIRBLKSIZ = VTOI(ap->a_vp)->i_e2fs->e2fs_bsize;
  149         int readcnt;
  150         off_t startoffset = uio->uio_offset;
  151 
  152         count = uio->uio_resid;
  153         /*
  154          * Avoid complications for partial directory entries by adjusting
  155          * the i/o to end at a block boundary.  Don't give up (like ufs
  156          * does) if the initial adjustment gives a negative count, since
  157          * many callers don't supply a large enough buffer.  The correct
  158          * size is a little larger than DIRBLKSIZ to allow for expansion
  159          * of directory entries, but some callers just use 512.
  160          */
  161         count -= (uio->uio_offset + count) & (DIRBLKSIZ -1);
  162         if (count <= 0)
  163                 count += DIRBLKSIZ;
  164         auio = *uio;
  165         auio.uio_iov = &aiov;
  166         auio.uio_iovcnt = 1;
  167         auio.uio_resid = count;
  168         auio.uio_segflg = UIO_SYSSPACE;
  169         aiov.iov_len = count;
  170         dirbuf = malloc(count, M_TEMP, M_WAITOK);
  171         aiov.iov_base = dirbuf;
  172         error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred);
  173         if (error == 0) {
  174                 readcnt = count - auio.uio_resid;
  175                 edp = (struct ext2fs_direct_2 *)&dirbuf[readcnt];
  176                 ncookies = 0;
  177                 bzero(&dstdp, offsetof(struct dirent, d_name));
  178                 for (dp = (struct ext2fs_direct_2 *)dirbuf;
  179                     !error && uio->uio_resid > 0 && dp < edp; ) {
  180                         /*-
  181                          * "New" ext2fs directory entries differ in 3 ways
  182                          * from ufs on-disk ones:
  183                          * - the name is not necessarily NUL-terminated.
  184                          * - the file type field always exists and always
  185                          *   follows the name length field.
  186                          * - the file type is encoded in a different way.
  187                          *
  188                          * "Old" ext2fs directory entries need no special
  189                          * conversions, since they are binary compatible
  190                          * with "new" entries having a file type of 0 (i.e.,
  191                          * EXT2_FT_UNKNOWN).  Splitting the old name length
  192                          * field didn't make a mess like it did in ufs,
  193                          * because ext2fs uses a machine-independent disk
  194                          * layout.
  195                          */
  196                         dstdp.d_fileno = dp->e2d_ino;
  197                         dstdp.d_type = FTTODT(dp->e2d_type);
  198                         dstdp.d_namlen = dp->e2d_namlen;
  199                         dstdp.d_reclen = GENERIC_DIRSIZ(&dstdp);
  200                         bcopy(dp->e2d_name, dstdp.d_name, dstdp.d_namlen);
  201                         bzero(dstdp.d_name + dstdp.d_namlen,
  202                             dstdp.d_reclen - offsetof(struct dirent, d_name) -
  203                             dstdp.d_namlen);
  204 
  205                         if (dp->e2d_reclen > 0) {
  206                                 if(dstdp.d_reclen <= uio->uio_resid) {
  207                                         /* advance dp */
  208                                         dp = (struct ext2fs_direct_2 *)
  209                                             ((char *)dp + dp->e2d_reclen);
  210                                         error =
  211                                           uiomove(&dstdp, dstdp.d_reclen, uio);
  212                                         if (!error)
  213                                                 ncookies++;
  214                                 } else
  215                                         break;
  216                         } else {
  217                                 error = EIO;
  218                                 break;
  219                         }
  220                 }
  221                 /* we need to correct uio_offset */
  222                 uio->uio_offset = startoffset + (caddr_t)dp - dirbuf;
  223 
  224                 if (!error && ap->a_ncookies != NULL) {
  225                         u_long *cookiep, *cookies, *ecookies;
  226                         off_t off;
  227 
  228                         if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
  229                                 panic("ext2_readdir: unexpected uio from NFS server");
  230                         cookies = malloc(ncookies * sizeof(u_long), M_TEMP,
  231                                M_WAITOK);
  232                         off = startoffset;
  233                         for (dp = (struct ext2fs_direct_2 *)dirbuf,
  234                              cookiep = cookies, ecookies = cookies + ncookies;
  235                              cookiep < ecookies;
  236                              dp = (struct ext2fs_direct_2 *)((caddr_t) dp + dp->e2d_reclen)) {
  237                                 off += dp->e2d_reclen;
  238                                 *cookiep++ = (u_long) off;
  239                         }
  240                         *ap->a_ncookies = ncookies;
  241                         *ap->a_cookies = cookies;
  242                 }
  243         }
  244         free(dirbuf, M_TEMP);
  245         if (ap->a_eofflag)
  246                 *ap->a_eofflag = VTOI(ap->a_vp)->i_size <= uio->uio_offset;
  247         return (error);
  248 }
  249 
  250 /*
  251  * Convert a component of a pathname into a pointer to a locked inode.
  252  * This is a very central and rather complicated routine.
  253  * If the file system is not maintained in a strict tree hierarchy,
  254  * this can result in a deadlock situation (see comments in code below).
  255  *
  256  * The cnp->cn_nameiop argument is LOOKUP, CREATE, RENAME, or DELETE depending
  257  * on whether the name is to be looked up, created, renamed, or deleted.
  258  * When CREATE, RENAME, or DELETE is specified, information usable in
  259  * creating, renaming, or deleting a directory entry may be calculated.
  260  * If flag has LOCKPARENT or'ed into it and the target of the pathname
  261  * exists, lookup returns both the target and its parent directory locked.
  262  * When creating or renaming and LOCKPARENT is specified, the target may
  263  * not be ".".  When deleting and LOCKPARENT is specified, the target may
  264  * be "."., but the caller must check to ensure it does an vrele and vput
  265  * instead of two vputs.
  266  *
  267  * Overall outline of ext2_lookup:
  268  *
  269  *      search for name in directory, to found or notfound
  270  * notfound:
  271  *      if creating, return locked directory, leaving info on available slots
  272  *      else return error
  273  * found:
  274  *      if at end of path and deleting, return information to allow delete
  275  *      if at end of path and rewriting (RENAME and LOCKPARENT), lock target
  276  *        inode and return info to allow rewrite
  277  *      if not at end, add name to cache; if at end and neither creating
  278  *        nor deleting, add name to cache
  279  */
  280 int
  281 ext2_lookup(ap)
  282         struct vop_cachedlookup_args /* {
  283                 struct vnode *a_dvp;
  284                 struct vnode **a_vpp;
  285                 struct componentname *a_cnp;
  286         } */ *ap;
  287 {
  288         struct vnode *vdp;              /* vnode for directory being searched */
  289         struct inode *dp;               /* inode for directory being searched */
  290         struct buf *bp;                 /* a buffer of directory entries */
  291         struct ext2fs_direct_2 *ep;     /* the current directory entry */
  292         int entryoffsetinblock;         /* offset of ep in bp's buffer */
  293         enum {NONE, COMPACT, FOUND} slotstatus;
  294         doff_t slotoffset;              /* offset of area with free space */
  295         int slotsize;                   /* size of area at slotoffset */
  296         doff_t i_diroff;                /* cached i_diroff value */
  297         doff_t i_offset;                /* cached i_offset value */
  298         int slotfreespace;              /* amount of space free in slot */
  299         int slotneeded;                 /* size of the entry we're seeking */
  300         int numdirpasses;               /* strategy for directory search */
  301         doff_t endsearch;               /* offset to end directory search */
  302         doff_t prevoff;                 /* prev entry dp->i_offset */
  303         struct vnode *pdp;              /* saved dp during symlink work */
  304         struct vnode *tdp;              /* returned by VFS_VGET */
  305         doff_t enduseful;               /* pointer past last used dir slot */
  306         u_long bmask;                   /* block offset mask */
  307         int namlen, error;
  308         struct vnode **vpp = ap->a_vpp;
  309         struct componentname *cnp = ap->a_cnp;
  310         struct ucred *cred = cnp->cn_cred;
  311         int flags = cnp->cn_flags;
  312         int nameiop = cnp->cn_nameiop;
  313         ino_t ino;
  314         int ltype;
  315 
  316         int     DIRBLKSIZ = VTOI(ap->a_dvp)->i_e2fs->e2fs_bsize;
  317 
  318         bp = NULL;
  319         slotoffset = -1;
  320         *vpp = NULL;
  321         vdp = ap->a_dvp;
  322         dp = VTOI(vdp);
  323         bmask = VFSTOEXT2(vdp->v_mount)->um_mountp->mnt_stat.f_iosize - 1;
  324 
  325         /*
  326          * We now have a segment name to search for, and a directory to search.
  327          */
  328 
  329         /*
  330          * Suppress search for slots unless creating
  331          * file and at end of pathname, in which case
  332          * we watch for a place to put the new file in
  333          * case it doesn't already exist.
  334          */
  335         ino = 0;
  336         i_diroff = dp->i_diroff;
  337         slotstatus = FOUND;
  338         slotfreespace = slotsize = slotneeded = 0;
  339         if ((nameiop == CREATE || nameiop == RENAME) &&
  340             (flags & ISLASTCN)) {
  341                 slotstatus = NONE;
  342                 slotneeded = EXT2_DIR_REC_LEN(cnp->cn_namelen);
  343                 /* was
  344                 slotneeded = (sizeof(struct direct) - MAXNAMLEN +
  345                         cnp->cn_namelen + 3) &~ 3; */
  346         }
  347 
  348         /*
  349          * If there is cached information on a previous search of
  350          * this directory, pick up where we last left off.
  351          * We cache only lookups as these are the most common
  352          * and have the greatest payoff. Caching CREATE has little
  353          * benefit as it usually must search the entire directory
  354          * to determine that the entry does not exist. Caching the
  355          * location of the last DELETE or RENAME has not reduced
  356          * profiling time and hence has been removed in the interest
  357          * of simplicity.
  358          */
  359         if (nameiop != LOOKUP || i_diroff == 0 ||
  360             i_diroff > dp->i_size) {
  361                 entryoffsetinblock = 0;
  362                 i_offset = 0;
  363                 numdirpasses = 1;
  364         } else {
  365                 i_offset = i_diroff;
  366                 if ((entryoffsetinblock = i_offset & bmask) &&
  367                     (error = ext2_blkatoff(vdp, (off_t)i_offset, NULL,
  368                     &bp)))
  369                         return (error);
  370                 numdirpasses = 2;
  371                 nchstats.ncs_2passes++;
  372         }
  373         prevoff = i_offset;
  374         endsearch = roundup2(dp->i_size, DIRBLKSIZ);
  375         enduseful = 0;
  376 
  377 searchloop:
  378         while (i_offset < endsearch) {
  379                 /*
  380                  * If necessary, get the next directory block.
  381                  */
  382                 if ((i_offset & bmask) == 0) {
  383                         if (bp != NULL)
  384                                 brelse(bp);
  385                         if ((error =
  386                             ext2_blkatoff(vdp, (off_t)i_offset, NULL,
  387                             &bp)) != 0)
  388                                 return (error);
  389                         entryoffsetinblock = 0;
  390                 }
  391                 /*
  392                  * If still looking for a slot, and at a DIRBLKSIZE
  393                  * boundary, have to start looking for free space again.
  394                  */
  395                 if (slotstatus == NONE &&
  396                     (entryoffsetinblock & (DIRBLKSIZ - 1)) == 0) {
  397                         slotoffset = -1;
  398                         slotfreespace = 0;
  399                 }
  400                 /*
  401                  * Get pointer to next entry.
  402                  * Full validation checks are slow, so we only check
  403                  * enough to insure forward progress through the
  404                  * directory. Complete checks can be run by setting
  405                  * "vfs.e2fs.dirchk" to be true.
  406                  */
  407                 ep = (struct ext2fs_direct_2 *)
  408                         ((char *)bp->b_data + entryoffsetinblock);
  409                 if (ep->e2d_reclen == 0 ||
  410                     (dirchk && ext2_dirbadentry(vdp, ep, entryoffsetinblock))) {
  411                         int i;
  412                         ext2_dirbad(dp, i_offset, "mangled entry");
  413                         i = DIRBLKSIZ - (entryoffsetinblock & (DIRBLKSIZ - 1));
  414                         i_offset += i;
  415                         entryoffsetinblock += i;
  416                         continue;
  417                 }
  418 
  419                 /*
  420                  * If an appropriate sized slot has not yet been found,
  421                  * check to see if one is available. Also accumulate space
  422                  * in the current block so that we can determine if
  423                  * compaction is viable.
  424                  */
  425                 if (slotstatus != FOUND) {
  426                         int size = ep->e2d_reclen;
  427 
  428                         if (ep->e2d_ino != 0)
  429                                 size -= EXT2_DIR_REC_LEN(ep->e2d_namlen);
  430                         if (size > 0) {
  431                                 if (size >= slotneeded) {
  432                                         slotstatus = FOUND;
  433                                         slotoffset = i_offset;
  434                                         slotsize = ep->e2d_reclen;
  435                                 } else if (slotstatus == NONE) {
  436                                         slotfreespace += size;
  437                                         if (slotoffset == -1)
  438                                                 slotoffset = i_offset;
  439                                         if (slotfreespace >= slotneeded) {
  440                                                 slotstatus = COMPACT;
  441                                                 slotsize = i_offset +
  442                                                       ep->e2d_reclen - slotoffset;
  443                                         }
  444                                 }
  445                         }
  446                 }
  447 
  448                 /*
  449                  * Check for a name match.
  450                  */
  451                 if (ep->e2d_ino) {
  452                         namlen = ep->e2d_namlen;
  453                         if (namlen == cnp->cn_namelen &&
  454                             !bcmp(cnp->cn_nameptr, ep->e2d_name,
  455                                 (unsigned)namlen)) {
  456                                 /*
  457                                  * Save directory entry's inode number and
  458                                  * reclen in ndp->ni_ufs area, and release
  459                                  * directory buffer.
  460                                  */
  461                                 ino = ep->e2d_ino;
  462                                 goto found;
  463                         }
  464                 }
  465                 prevoff = i_offset;
  466                 i_offset += ep->e2d_reclen;
  467                 entryoffsetinblock += ep->e2d_reclen;
  468                 if (ep->e2d_ino)
  469                         enduseful = i_offset;
  470         }
  471 /* notfound: */
  472         /*
  473          * If we started in the middle of the directory and failed
  474          * to find our target, we must check the beginning as well.
  475          */
  476         if (numdirpasses == 2) {
  477                 numdirpasses--;
  478                 i_offset = 0;
  479                 endsearch = i_diroff;
  480                 goto searchloop;
  481         }
  482         dp->i_offset = i_offset;
  483         if (bp != NULL)
  484                 brelse(bp);
  485         /*
  486          * If creating, and at end of pathname and current
  487          * directory has not been removed, then can consider
  488          * allowing file to be created.
  489          */
  490         if ((nameiop == CREATE || nameiop == RENAME) &&
  491             (flags & ISLASTCN) && dp->i_nlink != 0) {
  492                 /*
  493                  * Access for write is interpreted as allowing
  494                  * creation of files in the directory.
  495                  */
  496                 if ((error = VOP_ACCESS(vdp, VWRITE, cred, cnp->cn_thread)) != 0)
  497                         return (error);
  498                 /*
  499                  * Return an indication of where the new directory
  500                  * entry should be put.  If we didn't find a slot,
  501                  * then set dp->i_count to 0 indicating
  502                  * that the new slot belongs at the end of the
  503                  * directory. If we found a slot, then the new entry
  504                  * can be put in the range from dp->i_offset to
  505                  * dp->i_offset + dp->i_count.
  506                  */
  507                 if (slotstatus == NONE) {
  508                         dp->i_offset = roundup2(dp->i_size, DIRBLKSIZ);
  509                         dp->i_count = 0;
  510                         enduseful = dp->i_offset;
  511                 } else {
  512                         dp->i_offset = slotoffset;
  513                         dp->i_count = slotsize;
  514                         if (enduseful < slotoffset + slotsize)
  515                                 enduseful = slotoffset + slotsize;
  516                 }
  517                 dp->i_endoff = roundup2(enduseful, DIRBLKSIZ);
  518                 dp->i_flag |= IN_CHANGE | IN_UPDATE;
  519                 /*
  520                  * We return with the directory locked, so that
  521                  * the parameters we set up above will still be
  522                  * valid if we actually decide to do a direnter().
  523                  * We return ni_vp == NULL to indicate that the entry
  524                  * does not currently exist; we leave a pointer to
  525                  * the (locked) directory inode in ndp->ni_dvp.
  526                  * The pathname buffer is saved so that the name
  527                  * can be obtained later.
  528                  *
  529                  * NB - if the directory is unlocked, then this
  530                  * information cannot be used.
  531                  */
  532                 cnp->cn_flags |= SAVENAME;
  533                 return (EJUSTRETURN);
  534         }
  535         /*
  536          * Insert name into cache (as non-existent) if appropriate.
  537          */
  538         if ((cnp->cn_flags & MAKEENTRY) && nameiop != CREATE)
  539                 cache_enter(vdp, *vpp, cnp);
  540         return (ENOENT);
  541 
  542 found:
  543         if (numdirpasses == 2)
  544                 nchstats.ncs_pass2++;
  545         /*
  546          * Check that directory length properly reflects presence
  547          * of this entry.
  548          */
  549         if (entryoffsetinblock + EXT2_DIR_REC_LEN(ep->e2d_namlen)
  550                 > dp->i_size) {
  551                 ext2_dirbad(dp, i_offset, "i_size too small");
  552                 dp->i_size = entryoffsetinblock+EXT2_DIR_REC_LEN(ep->e2d_namlen);
  553                 dp->i_flag |= IN_CHANGE | IN_UPDATE;
  554         }
  555         brelse(bp);
  556 
  557         /*
  558          * Found component in pathname.
  559          * If the final component of path name, save information
  560          * in the cache as to where the entry was found.
  561          */
  562         if ((flags & ISLASTCN) && nameiop == LOOKUP)
  563                 dp->i_diroff = i_offset &~ (DIRBLKSIZ - 1);
  564         dp->i_offset = i_offset;
  565         /*
  566          * If deleting, and at end of pathname, return
  567          * parameters which can be used to remove file.
  568          */
  569         if (nameiop == DELETE && (flags & ISLASTCN)) {
  570                 /*
  571                  * Write access to directory required to delete files.
  572                  */
  573                 if ((error = VOP_ACCESS(vdp, VWRITE, cred, cnp->cn_thread)) != 0)
  574                         return (error);
  575                 /*
  576                  * Return pointer to current entry in dp->i_offset,
  577                  * and distance past previous entry (if there
  578                  * is a previous entry in this block) in dp->i_count.
  579                  * Save directory inode pointer in ndp->ni_dvp for dirremove().
  580                  */
  581                 if ((dp->i_offset & (DIRBLKSIZ - 1)) == 0)
  582                         dp->i_count = 0;
  583                 else
  584                         dp->i_count = dp->i_offset - prevoff;
  585                 if (dp->i_number == ino) {
  586                         VREF(vdp);
  587                         *vpp = vdp;
  588                         return (0);
  589                 }
  590                 if ((error = VFS_VGET(vdp->v_mount, ino, LK_EXCLUSIVE,
  591                     &tdp)) != 0)
  592                         return (error);
  593                 /*
  594                  * If directory is "sticky", then user must own
  595                  * the directory, or the file in it, else she
  596                  * may not delete it (unless she's root). This
  597                  * implements append-only directories.
  598                  */
  599                 if ((dp->i_mode & ISVTX) &&
  600                     cred->cr_uid != 0 &&
  601                     cred->cr_uid != dp->i_uid &&
  602                     VTOI(tdp)->i_uid != cred->cr_uid) {
  603                         vput(tdp);
  604                         return (EPERM);
  605                 }
  606                 *vpp = tdp;
  607                 return (0);
  608         }
  609 
  610         /*
  611          * If rewriting (RENAME), return the inode and the
  612          * information required to rewrite the present directory
  613          * Must get inode of directory entry to verify it's a
  614          * regular file, or empty directory.
  615          */
  616         if (nameiop == RENAME && (flags & ISLASTCN)) {
  617                 if ((error = VOP_ACCESS(vdp, VWRITE, cred, cnp->cn_thread)) != 0)
  618                         return (error);
  619                 /*
  620                  * Careful about locking second inode.
  621                  * This can only occur if the target is ".".
  622                  */
  623                 if (dp->i_number == ino)
  624                         return (EISDIR);
  625                 if ((error = VFS_VGET(vdp->v_mount, ino, LK_EXCLUSIVE,
  626                     &tdp)) != 0)
  627                         return (error);
  628                 *vpp = tdp;
  629                 cnp->cn_flags |= SAVENAME;
  630                 return (0);
  631         }
  632 
  633         /*
  634          * Step through the translation in the name.  We do not `vput' the
  635          * directory because we may need it again if a symbolic link
  636          * is relative to the current directory.  Instead we save it
  637          * unlocked as "pdp".  We must get the target inode before unlocking
  638          * the directory to insure that the inode will not be removed
  639          * before we get it.  We prevent deadlock by always fetching
  640          * inodes from the root, moving down the directory tree. Thus
  641          * when following backward pointers ".." we must unlock the
  642          * parent directory before getting the requested directory.
  643          * There is a potential race condition here if both the current
  644          * and parent directories are removed before the VFS_VGET for the
  645          * inode associated with ".." returns.  We hope that this occurs
  646          * infrequently since we cannot avoid this race condition without
  647          * implementing a sophisticated deadlock detection algorithm.
  648          * Note also that this simple deadlock detection scheme will not
  649          * work if the file system has any hard links other than ".."
  650          * that point backwards in the directory structure.
  651          */
  652         pdp = vdp;
  653         if (flags & ISDOTDOT) {
  654                 ltype = VOP_ISLOCKED(pdp);
  655                 VOP_UNLOCK(pdp, 0);     /* race to get the inode */
  656                 error = VFS_VGET(vdp->v_mount, ino, cnp->cn_lkflags, &tdp);
  657                 vn_lock(pdp, ltype | LK_RETRY);
  658                 if (error != 0)
  659                         return (error);
  660                 *vpp = tdp;
  661         } else if (dp->i_number == ino) {
  662                 VREF(vdp);      /* we want ourself, ie "." */
  663                 /*
  664                  * When we lookup "." we still can be asked to lock it
  665                  * differently.
  666                  */
  667                 ltype = cnp->cn_lkflags & LK_TYPE_MASK;
  668                 if (ltype != VOP_ISLOCKED(vdp)) {
  669                         if (ltype == LK_EXCLUSIVE)
  670                                 vn_lock(vdp, LK_UPGRADE | LK_RETRY);
  671                         else /* if (ltype == LK_SHARED) */
  672                                 vn_lock(vdp, LK_DOWNGRADE | LK_RETRY);
  673                 }
  674                 *vpp = vdp;
  675         } else {
  676                 if ((error = VFS_VGET(vdp->v_mount, ino, cnp->cn_lkflags,
  677                     &tdp)) != 0)
  678                         return (error);
  679                 *vpp = tdp;
  680         }
  681 
  682         /*
  683          * Insert name into cache if appropriate.
  684          */
  685         if (cnp->cn_flags & MAKEENTRY)
  686                 cache_enter(vdp, *vpp, cnp);
  687         return (0);
  688 }
  689 
  690 void
  691 ext2_dirbad(ip, offset, how)
  692         struct inode *ip;
  693         doff_t offset;
  694         char *how;
  695 {
  696         struct mount *mp;
  697 
  698         mp = ITOV(ip)->v_mount;
  699         if ((mp->mnt_flag & MNT_RDONLY) == 0)
  700                 panic("ext2_dirbad: %s: bad dir ino %lu at offset %ld: %s\n",
  701                         mp->mnt_stat.f_mntonname, (u_long)ip->i_number,(long)offset, how);
  702         else
  703         (void)printf("%s: bad dir ino %lu at offset %ld: %s\n",
  704             mp->mnt_stat.f_mntonname, (u_long)ip->i_number, (long)offset, how);
  705 
  706 }
  707 
  708 /*
  709  * Do consistency checking on a directory entry:
  710  *      record length must be multiple of 4
  711  *      entry must fit in rest of its DIRBLKSIZ block
  712  *      record must be large enough to contain entry
  713  *      name is not longer than MAXNAMLEN
  714  *      name must be as long as advertised, and null terminated
  715  */
  716 /*
  717  *      changed so that it confirms to ext2_check_dir_entry
  718  */
  719 static int
  720 ext2_dirbadentry(dp, de, entryoffsetinblock)
  721         struct vnode *dp;
  722         struct ext2fs_direct_2 *de;
  723         int entryoffsetinblock;
  724 {
  725         int     DIRBLKSIZ = VTOI(dp)->i_e2fs->e2fs_bsize;
  726 
  727         char * error_msg = NULL;
  728 
  729         if (de->e2d_reclen < EXT2_DIR_REC_LEN(1))
  730                 error_msg = "rec_len is smaller than minimal";
  731         else if (de->e2d_reclen % 4 != 0)
  732                 error_msg = "rec_len % 4 != 0";
  733         else if (de->e2d_reclen < EXT2_DIR_REC_LEN(de->e2d_namlen))
  734                 error_msg = "reclen is too small for name_len";
  735         else if (entryoffsetinblock + de->e2d_reclen > DIRBLKSIZ)
  736                 error_msg = "directory entry across blocks";
  737         /* else LATER
  738              if (de->inode > dir->i_sb->u.ext2_sb.s_es->s_inodes_count)
  739                 error_msg = "inode out of bounds";
  740         */
  741 
  742         if (error_msg != NULL) {
  743                 printf("bad directory entry: %s\n", error_msg);
  744                 printf("offset=%d, inode=%lu, rec_len=%u, name_len=%u\n",
  745                         entryoffsetinblock, (unsigned long)de->e2d_ino,
  746                         de->e2d_reclen, de->e2d_namlen);
  747         }
  748         return error_msg == NULL ? 0 : 1;
  749 }
  750 
  751 /*
  752  * Write a directory entry after a call to namei, using the parameters
  753  * that it left in nameidata.  The argument ip is the inode which the new
  754  * directory entry will refer to.  Dvp is a pointer to the directory to
  755  * be written, which was left locked by namei. Remaining parameters
  756  * (dp->i_offset, dp->i_count) indicate how the space for the new
  757  * entry is to be obtained.
  758  */
  759 int
  760 ext2_direnter(ip, dvp, cnp)
  761         struct inode *ip;
  762         struct vnode *dvp;
  763         struct componentname *cnp;
  764 {
  765         struct ext2fs_direct_2 *ep, *nep;
  766         struct inode *dp;
  767         struct buf *bp;
  768         struct ext2fs_direct_2 newdir;
  769         struct iovec aiov;
  770         struct uio auio;
  771         u_int dsize;
  772         int error, loc, newentrysize, spacefree;
  773         char *dirbuf;
  774         int     DIRBLKSIZ = ip->i_e2fs->e2fs_bsize;
  775 
  776 
  777 #ifdef DIAGNOSTIC
  778         if ((cnp->cn_flags & SAVENAME) == 0)
  779                 panic("direnter: missing name");
  780 #endif
  781         dp = VTOI(dvp);
  782         newdir.e2d_ino = ip->i_number;
  783         newdir.e2d_namlen = cnp->cn_namelen;
  784         if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
  785             EXT2F_INCOMPAT_FTYPE))
  786                 newdir.e2d_type = DTTOFT(IFTODT(ip->i_mode));
  787         else
  788                 newdir.e2d_type = EXT2_FT_UNKNOWN;
  789         bcopy(cnp->cn_nameptr, newdir.e2d_name, (unsigned)cnp->cn_namelen + 1);
  790         newentrysize = EXT2_DIR_REC_LEN(newdir.e2d_namlen);
  791         if (dp->i_count == 0) {
  792                 /*
  793                  * If dp->i_count is 0, then namei could find no
  794                  * space in the directory. Here, dp->i_offset will
  795                  * be on a directory block boundary and we will write the
  796                  * new entry into a fresh block.
  797                  */
  798                 if (dp->i_offset & (DIRBLKSIZ - 1))
  799                         panic("ext2_direnter: newblk");
  800                 auio.uio_offset = dp->i_offset;
  801                 newdir.e2d_reclen = DIRBLKSIZ;
  802                 auio.uio_resid = newentrysize;
  803                 aiov.iov_len = newentrysize;
  804                 aiov.iov_base = (caddr_t)&newdir;
  805                 auio.uio_iov = &aiov;
  806                 auio.uio_iovcnt = 1;
  807                 auio.uio_rw = UIO_WRITE;
  808                 auio.uio_segflg = UIO_SYSSPACE;
  809                 auio.uio_td = (struct thread *)0;
  810                 error = VOP_WRITE(dvp, &auio, IO_SYNC, cnp->cn_cred);
  811                 if (DIRBLKSIZ >
  812                     VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
  813                         /* XXX should grow with balloc() */
  814                         panic("ext2_direnter: frag size");
  815                 else if (!error) {
  816                         dp->i_size = roundup2(dp->i_size, DIRBLKSIZ);
  817                         dp->i_flag |= IN_CHANGE;
  818                 }
  819                 return (error);
  820         }
  821 
  822         /*
  823          * If dp->i_count is non-zero, then namei found space
  824          * for the new entry in the range dp->i_offset to
  825          * dp->i_offset + dp->i_count in the directory.
  826          * To use this space, we may have to compact the entries located
  827          * there, by copying them together towards the beginning of the
  828          * block, leaving the free space in one usable chunk at the end.
  829          */
  830 
  831         /*
  832          * Increase size of directory if entry eats into new space.
  833          * This should never push the size past a new multiple of
  834          * DIRBLKSIZE.
  835          *
  836          * N.B. - THIS IS AN ARTIFACT OF 4.2 AND SHOULD NEVER HAPPEN.
  837          */
  838         if (dp->i_offset + dp->i_count > dp->i_size)
  839                 dp->i_size = dp->i_offset + dp->i_count;
  840         /*
  841          * Get the block containing the space for the new directory entry.
  842          */
  843         if ((error = ext2_blkatoff(dvp, (off_t)dp->i_offset, &dirbuf,
  844             &bp)) != 0)
  845                 return (error);
  846         /*
  847          * Find space for the new entry. In the simple case, the entry at
  848          * offset base will have the space. If it does not, then namei
  849          * arranged that compacting the region dp->i_offset to
  850          * dp->i_offset + dp->i_count would yield the
  851          * space.
  852          */
  853         ep = (struct ext2fs_direct_2 *)dirbuf;
  854         dsize = EXT2_DIR_REC_LEN(ep->e2d_namlen);
  855         spacefree = ep->e2d_reclen - dsize;
  856         for (loc = ep->e2d_reclen; loc < dp->i_count; ) {
  857                 nep = (struct ext2fs_direct_2 *)(dirbuf + loc);
  858                 if (ep->e2d_ino) {
  859                         /* trim the existing slot */
  860                         ep->e2d_reclen = dsize;
  861                         ep = (struct ext2fs_direct_2 *)((char *)ep + dsize);
  862                 } else {
  863                         /* overwrite; nothing there; header is ours */
  864                         spacefree += dsize;
  865                 }
  866                 dsize = EXT2_DIR_REC_LEN(nep->e2d_namlen);
  867                 spacefree += nep->e2d_reclen - dsize;
  868                 loc += nep->e2d_reclen;
  869                 bcopy((caddr_t)nep, (caddr_t)ep, dsize);
  870         }
  871         /*
  872          * Update the pointer fields in the previous entry (if any),
  873          * copy in the new entry, and write out the block.
  874          */
  875         if (ep->e2d_ino == 0) {
  876                 if (spacefree + dsize < newentrysize)
  877                         panic("ext2_direnter: compact1");
  878                 newdir.e2d_reclen = spacefree + dsize;
  879         } else {
  880                 if (spacefree < newentrysize)
  881                         panic("ext2_direnter: compact2");
  882                 newdir.e2d_reclen = spacefree;
  883                 ep->e2d_reclen = dsize;
  884                 ep = (struct ext2fs_direct_2 *)((char *)ep + dsize);
  885         }
  886         bcopy((caddr_t)&newdir, (caddr_t)ep, (u_int)newentrysize);
  887         if (DOINGASYNC(dvp)) {
  888                 bdwrite(bp);
  889                 error = 0;
  890         } else {
  891                 error = bwrite(bp);
  892         }
  893         dp->i_flag |= IN_CHANGE | IN_UPDATE;
  894         if (!error && dp->i_endoff && dp->i_endoff < dp->i_size)
  895                 error = ext2_truncate(dvp, (off_t)dp->i_endoff, IO_SYNC,
  896                     cnp->cn_cred, cnp->cn_thread);
  897         return (error);
  898 }
  899 
  900 /*
  901  * Remove a directory entry after a call to namei, using
  902  * the parameters which it left in nameidata. The entry
  903  * dp->i_offset contains the offset into the directory of the
  904  * entry to be eliminated.  The dp->i_count field contains the
  905  * size of the previous record in the directory.  If this
  906  * is 0, the first entry is being deleted, so we need only
  907  * zero the inode number to mark the entry as free.  If the
  908  * entry is not the first in the directory, we must reclaim
  909  * the space of the now empty record by adding the record size
  910  * to the size of the previous entry.
  911  */
  912 int
  913 ext2_dirremove(dvp, cnp)
  914         struct vnode *dvp;
  915         struct componentname *cnp;
  916 {
  917         struct inode *dp;
  918         struct ext2fs_direct_2 *ep, *rep;
  919         struct buf *bp;
  920         int error;
  921 
  922         dp = VTOI(dvp);
  923         if (dp->i_count == 0) {
  924                 /*
  925                  * First entry in block: set d_ino to zero.
  926                  */
  927                 if ((error =
  928                     ext2_blkatoff(dvp, (off_t)dp->i_offset, (char **)&ep,
  929                     &bp)) != 0)
  930                         return (error);
  931                 ep->e2d_ino = 0;
  932                 error = bwrite(bp);
  933                 dp->i_flag |= IN_CHANGE | IN_UPDATE;
  934                 return (error);
  935         }
  936         /*
  937          * Collapse new free space into previous entry.
  938          */
  939         if ((error = ext2_blkatoff(dvp, (off_t)(dp->i_offset - dp->i_count),
  940             (char **)&ep, &bp)) != 0)
  941                 return (error);
  942 
  943         /* Set 'rep' to the entry being removed. */
  944         if (dp->i_count == 0)
  945                 rep = ep;
  946         else
  947                 rep = (struct ext2fs_direct_2 *)((char *)ep + ep->e2d_reclen);
  948         ep->e2d_reclen += rep->e2d_reclen;
  949         if (DOINGASYNC(dvp) && dp->i_count != 0)
  950                 bdwrite(bp);
  951         else
  952                 error = bwrite(bp);
  953         dp->i_flag |= IN_CHANGE | IN_UPDATE;
  954         return (error);
  955 }
  956 
  957 /*
  958  * Rewrite an existing directory entry to point at the inode
  959  * supplied.  The parameters describing the directory entry are
  960  * set up by a call to namei.
  961  */
  962 int
  963 ext2_dirrewrite(dp, ip, cnp)
  964         struct inode *dp, *ip;
  965         struct componentname *cnp;
  966 {
  967         struct buf *bp;
  968         struct ext2fs_direct_2 *ep;
  969         struct vnode *vdp = ITOV(dp);
  970         int error;
  971 
  972         if ((error = ext2_blkatoff(vdp, (off_t)dp->i_offset, (char **)&ep,
  973             &bp)) != 0)
  974                 return (error);
  975         ep->e2d_ino = ip->i_number;
  976         if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
  977             EXT2F_INCOMPAT_FTYPE))
  978                 ep->e2d_type = DTTOFT(IFTODT(ip->i_mode));
  979         else
  980                 ep->e2d_type = EXT2_FT_UNKNOWN;
  981         error = bwrite(bp);
  982         dp->i_flag |= IN_CHANGE | IN_UPDATE;
  983         return (error);
  984 }
  985 
  986 /*
  987  * Check if a directory is empty or not.
  988  * Inode supplied must be locked.
  989  *
  990  * Using a struct dirtemplate here is not precisely
  991  * what we want, but better than using a struct direct.
  992  *
  993  * NB: does not handle corrupted directories.
  994  */
  995 int
  996 ext2_dirempty(ip, parentino, cred)
  997         struct inode *ip;
  998         ino_t parentino;
  999         struct ucred *cred;
 1000 {
 1001         off_t off;
 1002         struct dirtemplate dbuf;
 1003         struct ext2fs_direct_2 *dp = (struct ext2fs_direct_2 *)&dbuf;
 1004         int error, count, namlen;
 1005 #define MINDIRSIZ (sizeof (struct dirtemplate) / 2)
 1006 
 1007         for (off = 0; off < ip->i_size; off += dp->e2d_reclen) {
 1008                 error = vn_rdwr(UIO_READ, ITOV(ip), (caddr_t)dp, MINDIRSIZ,
 1009                     off, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK, cred,
 1010                     NOCRED, &count, (struct thread *)0);
 1011                 /*
 1012                  * Since we read MINDIRSIZ, residual must
 1013                  * be 0 unless we're at end of file.
 1014                  */
 1015                 if (error || count != 0)
 1016                         return (0);
 1017                 /* avoid infinite loops */
 1018                 if (dp->e2d_reclen == 0)
 1019                         return (0);
 1020                 /* skip empty entries */
 1021                 if (dp->e2d_ino == 0)
 1022                         continue;
 1023                 /* accept only "." and ".." */
 1024                 namlen = dp->e2d_namlen;
 1025                 if (namlen > 2)
 1026                         return (0);
 1027                 if (dp->e2d_name[0] != '.')
 1028                         return (0);
 1029                 /*
 1030                  * At this point namlen must be 1 or 2.
 1031                  * 1 implies ".", 2 implies ".." if second
 1032                  * char is also "."
 1033                  */
 1034                 if (namlen == 1)
 1035                         continue;
 1036                 if (dp->e2d_name[1] == '.' && dp->e2d_ino == parentino)
 1037                         continue;
 1038                 return (0);
 1039         }
 1040         return (1);
 1041 }
 1042 
 1043 /*
 1044  * Check if source directory is in the path of the target directory.
 1045  * Target is supplied locked, source is unlocked.
 1046  * The target is always vput before returning.
 1047  */
 1048 int
 1049 ext2_checkpath(source, target, cred)
 1050         struct inode *source, *target;
 1051         struct ucred *cred;
 1052 {
 1053         struct vnode *vp;
 1054         int error, rootino, namlen;
 1055         struct dirtemplate dirbuf;
 1056 
 1057         vp = ITOV(target);
 1058         if (target->i_number == source->i_number) {
 1059                 error = EEXIST;
 1060                 goto out;
 1061         }
 1062         rootino = EXT2_ROOTINO;
 1063         error = 0;
 1064         if (target->i_number == rootino)
 1065                 goto out;
 1066 
 1067         for (;;) {
 1068                 if (vp->v_type != VDIR) {
 1069                         error = ENOTDIR;
 1070                         break;
 1071                 }
 1072                 error = vn_rdwr(UIO_READ, vp, (caddr_t)&dirbuf,
 1073                         sizeof (struct dirtemplate), (off_t)0, UIO_SYSSPACE,
 1074                         IO_NODELOCKED | IO_NOMACCHECK, cred, NOCRED, NULL,
 1075                         NULL);
 1076                 if (error != 0)
 1077                         break;
 1078                 namlen = dirbuf.dotdot_type;    /* like ufs little-endian */
 1079                 if (namlen != 2 ||
 1080                     dirbuf.dotdot_name[0] != '.' ||
 1081                     dirbuf.dotdot_name[1] != '.') {
 1082                         error = ENOTDIR;
 1083                         break;
 1084                 }
 1085                 if (dirbuf.dotdot_ino == source->i_number) {
 1086                         error = EINVAL;
 1087                         break;
 1088                 }
 1089                 if (dirbuf.dotdot_ino == rootino)
 1090                         break;
 1091                 vput(vp);
 1092                 if ((error = VFS_VGET(vp->v_mount, dirbuf.dotdot_ino,
 1093                     LK_EXCLUSIVE, &vp)) != 0) {
 1094                         vp = NULL;
 1095                         break;
 1096                 }
 1097         }
 1098 
 1099 out:
 1100         if (error == ENOTDIR)
 1101                 printf("checkpath: .. not a directory\n");
 1102         if (vp != NULL)
 1103                 vput(vp);
 1104         return (error);
 1105 }

Cache object: ae3c68163d589187c4503cf3c533cae5


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