1dbaf90cdb
Remove the unnecessary inclusion of disklabel.h in cd9660_vfsops.c so that I don't have to worry about the latter when changing disklabel.h. Supply prototypes for some functions that were implicitly declared and fix the resulting warnings and errors (timevals were punned to timespecs).
470 lines
14 KiB
C
470 lines
14 KiB
C
/*-
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley
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* by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
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* Support code is derived from software contributed to Berkeley
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* by Atsushi Murai (amurai@spec.co.jp).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)ufs_lookup.c 7.33 (Berkeley) 5/19/91
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*
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* @(#)cd9660_lookup.c 8.2 (Berkeley) 1/23/94
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* $Id: cd9660_lookup.c,v 1.3 1994/08/02 07:41:17 davidg Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/namei.h>
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#include <sys/buf.h>
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#include <sys/file.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <isofs/cd9660/iso.h>
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#include <isofs/cd9660/cd9660_node.h>
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#include <isofs/cd9660/iso_rrip.h>
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#include <isofs/cd9660/cd9660_rrip.h>
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struct nchstats iso_nchstats;
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/*
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* Convert a component of a pathname into a pointer to a locked inode.
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* This is a very central and rather complicated routine.
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* If the file system is not maintained in a strict tree hierarchy,
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* this can result in a deadlock situation (see comments in code below).
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*
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* The flag argument is LOOKUP, CREATE, RENAME, or DELETE depending on
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* whether the name is to be looked up, created, renamed, or deleted.
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* When CREATE, RENAME, or DELETE is specified, information usable in
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* creating, renaming, or deleting a directory entry may be calculated.
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* If flag has LOCKPARENT or'ed into it and the target of the pathname
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* exists, lookup returns both the target and its parent directory locked.
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* When creating or renaming and LOCKPARENT is specified, the target may
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* not be ".". When deleting and LOCKPARENT is specified, the target may
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* be "."., but the caller must check to ensure it does an vrele and iput
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* instead of two iputs.
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*
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* Overall outline of ufs_lookup:
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*
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* check accessibility of directory
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* look for name in cache, if found, then if at end of path
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* and deleting or creating, drop it, else return name
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* search for name in directory, to found or notfound
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* notfound:
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* if creating, return locked directory, leaving info on available slots
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* else return error
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* found:
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* if at end of path and deleting, return information to allow delete
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* if at end of path and rewriting (RENAME and LOCKPARENT), lock target
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* inode and return info to allow rewrite
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* if not at end, add name to cache; if at end and neither creating
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* nor deleting, add name to cache
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*
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* NOTE: (LOOKUP | LOCKPARENT) currently returns the parent inode unlocked.
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*/
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int
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cd9660_lookup(ap)
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struct vop_lookup_args /* {
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struct vnode *a_dvp;
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struct vnode **a_vpp;
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struct componentname *a_cnp;
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} */ *ap;
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{
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register struct vnode *vdp; /* vnode for directory being searched */
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register struct iso_node *dp; /* inode for directory being searched */
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register struct iso_mnt *imp; /* file system that directory is in */
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struct buf *bp; /* a buffer of directory entries */
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struct iso_directory_record *ep = 0;/* the current directory entry */
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int entryoffsetinblock; /* offset of ep in bp's buffer */
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int saveoffset = 0; /* offset of last directory entry in dir */
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int numdirpasses; /* strategy for directory search */
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doff_t endsearch; /* offset to end directory search */
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struct iso_node *pdp; /* saved dp during symlink work */
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struct iso_node *tdp; /* returned by iget */
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int lockparent; /* 1 => lockparent flag is set */
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int wantparent; /* 1 => wantparent or lockparent flag */
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int error;
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ino_t ino = 0;
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int reclen;
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u_short namelen;
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char altname[NAME_MAX];
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int res;
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int assoc, len;
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char *name;
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struct vnode **vpp = ap->a_vpp;
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struct componentname *cnp = ap->a_cnp;
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struct ucred *cred = cnp->cn_cred;
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int flags = cnp->cn_flags;
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int nameiop = cnp->cn_nameiop;
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bp = NULL;
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*vpp = NULL;
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vdp = ap->a_dvp;
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dp = VTOI(vdp);
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imp = dp->i_mnt;
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lockparent = flags & LOCKPARENT;
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wantparent = flags & (LOCKPARENT|WANTPARENT);
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/*
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* Check accessiblity of directory.
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*/
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if (vdp->v_type != VDIR)
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return (ENOTDIR);
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if (error = VOP_ACCESS(vdp, VEXEC, cred, cnp->cn_proc))
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return (error);
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/*
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* We now have a segment name to search for, and a directory to search.
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*
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* Before tediously performing a linear scan of the directory,
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* check the name cache to see if the directory/name pair
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* we are looking for is known already.
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*/
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if (error = cache_lookup(vdp, vpp, cnp)) {
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int vpid; /* capability number of vnode */
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if (error == ENOENT)
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return (error);
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#ifdef PARANOID
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if ((vdp->v_flag & VROOT) && (flags & ISDOTDOT))
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panic("ufs_lookup: .. through root");
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#endif
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/*
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* Get the next vnode in the path.
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* See comment below starting `Step through' for
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* an explaination of the locking protocol.
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*/
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pdp = dp;
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dp = VTOI(*vpp);
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vdp = *vpp;
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vpid = vdp->v_id;
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if (pdp == dp) {
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VREF(vdp);
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error = 0;
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} else if (flags & ISDOTDOT) {
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ISO_IUNLOCK(pdp);
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error = vget(vdp, 1);
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if (!error && lockparent && (flags & ISLASTCN))
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ISO_ILOCK(pdp);
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} else {
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error = vget(vdp, 1);
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if (!lockparent || error || !(flags & ISLASTCN))
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ISO_IUNLOCK(pdp);
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}
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/*
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* Check that the capability number did not change
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* while we were waiting for the lock.
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*/
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if (!error) {
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if (vpid == vdp->v_id)
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return (0);
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iso_iput(dp);
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if (lockparent && pdp != dp && (flags & ISLASTCN))
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ISO_IUNLOCK(pdp);
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}
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ISO_ILOCK(pdp);
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dp = pdp;
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vdp = ITOV(dp);
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*vpp = NULL;
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}
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len = cnp->cn_namelen;
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name = cnp->cn_nameptr;
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/*
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* A leading `=' means, we are looking for an associated file
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*/
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if (assoc = (imp->iso_ftype != ISO_FTYPE_RRIP && *name == ASSOCCHAR)) {
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len--;
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name++;
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}
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/*
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* If there is cached information on a previous search of
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* this directory, pick up where we last left off.
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* We cache only lookups as these are the most common
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* and have the greatest payoff. Caching CREATE has little
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* benefit as it usually must search the entire directory
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* to determine that the entry does not exist. Caching the
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* location of the last DELETE or RENAME has not reduced
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* profiling time and hence has been removed in the interest
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* of simplicity.
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*/
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if (nameiop != LOOKUP || dp->i_diroff == 0 ||
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dp->i_diroff > dp->i_size) {
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entryoffsetinblock = 0;
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dp->i_offset = 0;
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numdirpasses = 1;
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} else {
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dp->i_offset = dp->i_diroff;
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entryoffsetinblock = iso_blkoff(imp, dp->i_offset);
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if (entryoffsetinblock != 0) {
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if (error = iso_blkatoff(dp, dp->i_offset, &bp))
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return (error);
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}
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numdirpasses = 2;
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iso_nchstats.ncs_2passes++;
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}
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endsearch = roundup(dp->i_size, imp->logical_block_size);
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searchloop:
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while (dp->i_offset < endsearch) {
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/*
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* If offset is on a block boundary,
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* read the next directory block.
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* Release previous if it exists.
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*/
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if (iso_blkoff(imp, dp->i_offset) == 0) {
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if (bp != NULL)
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brelse(bp);
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if (error = iso_blkatoff(dp, dp->i_offset, &bp))
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return (error);
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entryoffsetinblock = 0;
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}
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/*
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* Get pointer to next entry.
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*/
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ep = (struct iso_directory_record *)
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(bp->b_un.b_addr + entryoffsetinblock);
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reclen = isonum_711 (ep->length);
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if (reclen == 0) {
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/* skip to next block, if any */
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dp->i_offset =
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roundup(dp->i_offset, imp->logical_block_size);
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continue;
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}
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if (reclen < ISO_DIRECTORY_RECORD_SIZE)
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/* illegal entry, stop */
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break;
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if (entryoffsetinblock + reclen > imp->logical_block_size)
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/* entries are not allowed to cross boundaries */
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break;
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/*
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* Check for a name match.
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*/
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namelen = isonum_711(ep->name_len);
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if (reclen < ISO_DIRECTORY_RECORD_SIZE + namelen)
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/* illegal entry, stop */
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break;
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switch (imp->iso_ftype) {
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default:
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if ((!(isonum_711(ep->flags)&4)) == !assoc) {
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if ((len == 1
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&& *name == '.')
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|| (flags & ISDOTDOT)) {
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if (namelen == 1
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&& ep->name[0] == ((flags & ISDOTDOT) ? 1 : 0)) {
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/*
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* Save directory entry's inode number and
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* reclen in ndp->ni_ufs area, and release
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* directory buffer.
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*/
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isodirino(&dp->i_ino,ep,imp);
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goto found;
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}
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if (namelen != 1
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|| ep->name[0] != 0)
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goto notfound;
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} else if (!(res = isofncmp(name,len,
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ep->name,namelen))) {
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if (isonum_711(ep->flags)&2)
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isodirino(&ino,ep,imp);
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else
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ino = dbtob(bp->b_blkno)
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+ entryoffsetinblock;
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saveoffset = dp->i_offset;
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} else if (ino)
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goto foundino;
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#ifdef NOSORTBUG /* On some CDs directory entries are not sorted correctly */
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else if (res < 0)
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goto notfound;
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else if (res > 0 && numdirpasses == 2)
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numdirpasses++;
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#endif
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}
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break;
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case ISO_FTYPE_RRIP:
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if (isonum_711(ep->flags)&2)
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isodirino(&ino,ep,imp);
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else
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ino = dbtob(bp->b_blkno) + entryoffsetinblock;
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dp->i_ino = ino;
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cd9660_rrip_getname(ep,altname,&namelen,&dp->i_ino,imp);
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if (namelen == cnp->cn_namelen
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&& !bcmp(name,altname,namelen))
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goto found;
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ino = 0;
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break;
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}
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dp->i_offset += reclen;
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entryoffsetinblock += reclen;
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}
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if (ino) {
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foundino:
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dp->i_ino = ino;
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if (saveoffset != dp->i_offset) {
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if (iso_lblkno(imp,dp->i_offset)
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!= iso_lblkno(imp,saveoffset)) {
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if (bp != NULL)
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brelse(bp);
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if (error = iso_blkatoff(dp, saveoffset, &bp))
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return (error);
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}
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ep = (struct iso_directory_record *)(bp->b_un.b_addr
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+ iso_blkoff(imp,saveoffset));
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dp->i_offset = saveoffset;
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}
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goto found;
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}
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notfound:
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/*
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* If we started in the middle of the directory and failed
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* to find our target, we must check the beginning as well.
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*/
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if (numdirpasses == 2) {
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numdirpasses--;
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dp->i_offset = 0;
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endsearch = dp->i_diroff;
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goto searchloop;
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}
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if (bp != NULL)
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brelse(bp);
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/*
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* Insert name into cache (as non-existent) if appropriate.
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*/
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if (cnp->cn_flags & MAKEENTRY)
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cache_enter(vdp, *vpp, cnp);
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if (nameiop == CREATE || nameiop == RENAME)
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return (EJUSTRETURN);
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return (ENOENT);
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found:
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if (numdirpasses == 2)
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iso_nchstats.ncs_pass2++;
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if (bp != NULL)
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brelse(bp);
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/*
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* Found component in pathname.
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* If the final component of path name, save information
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* in the cache as to where the entry was found.
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*/
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if ((flags & ISLASTCN) && nameiop == LOOKUP)
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dp->i_diroff = dp->i_offset;
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/*
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* Step through the translation in the name. We do not `iput' the
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* directory because we may need it again if a symbolic link
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* is relative to the current directory. Instead we save it
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* unlocked as "pdp". We must get the target inode before unlocking
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* the directory to insure that the inode will not be removed
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* before we get it. We prevent deadlock by always fetching
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* inodes from the root, moving down the directory tree. Thus
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* when following backward pointers ".." we must unlock the
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* parent directory before getting the requested directory.
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* There is a potential race condition here if both the current
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* and parent directories are removed before the `iget' for the
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* inode associated with ".." returns. We hope that this occurs
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* infrequently since we cannot avoid this race condition without
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* implementing a sophisticated deadlock detection algorithm.
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* Note also that this simple deadlock detection scheme will not
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* work if the file system has any hard links other than ".."
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* that point backwards in the directory structure.
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*/
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pdp = dp;
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/*
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* If ino is different from dp->i_ino,
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* it's a relocated directory.
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*/
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if (flags & ISDOTDOT) {
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ISO_IUNLOCK(pdp); /* race to get the inode */
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if (error = iso_iget(dp,dp->i_ino,
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dp->i_ino != ino,
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&tdp,ep)) {
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ISO_ILOCK(pdp);
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return (error);
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}
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if (lockparent && (flags & ISLASTCN))
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ISO_ILOCK(pdp);
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*vpp = ITOV(tdp);
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} else if (dp->i_number == dp->i_ino) {
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VREF(vdp); /* we want ourself, ie "." */
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*vpp = vdp;
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} else {
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if (error = iso_iget(dp,dp->i_ino,dp->i_ino!=ino,&tdp,ep))
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return (error);
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if (!lockparent || !(flags & ISLASTCN))
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ISO_IUNLOCK(pdp);
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*vpp = ITOV(tdp);
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}
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/*
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* Insert name into cache if appropriate.
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*/
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if (cnp->cn_flags & MAKEENTRY)
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cache_enter(vdp, *vpp, cnp);
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return (0);
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}
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/*
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* Return buffer with contents of block "offset"
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* from the beginning of directory "ip". If "res"
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* is non-zero, fill it in with a pointer to the
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* remaining space in the directory.
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*/
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int
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iso_blkatoff(ip, offset, bpp)
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struct iso_node *ip;
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doff_t offset;
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struct buf **bpp;
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{
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register struct iso_mnt *imp = ip->i_mnt;
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daddr_t lbn = iso_lblkno(imp,offset);
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int bsize = iso_blksize(imp,ip,lbn);
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struct buf *bp;
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int error;
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if (error = bread(ITOV(ip),lbn,bsize,NOCRED,&bp)) {
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brelse(bp);
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*bpp = 0;
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return (error);
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}
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*bpp = bp;
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return (0);
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}
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