a0595d0249
locking flags when acquiring a vnode. The immediate purpose is to allow polling lock requests (LK_NOWAIT) needed by soft updates to avoid deadlock when enlisting other processes to help with the background cleanup. For the future it will allow the use of shared locks for read access to vnodes. This change touches a lot of files as it affects most filesystems within the system. It has been well tested on FFS, loopback, and CD-ROM filesystems. only lightly on the others, so if you find a problem there, please let me (mckusick@mckusick.com) know.
446 lines
11 KiB
C
446 lines
11 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1994, 1995
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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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* @(#)cd9660_node.c 8.2 (Berkeley) 1/23/94
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* $FreeBSD$
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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/mount.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/stat.h>
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#include <sys/mutex.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/cd9660_mount.h>
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/*
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* Structures associated with iso_node caching.
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*/
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static struct iso_node **isohashtbl;
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static u_long isohash;
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#define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash)
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static struct mtx cd9660_ihash_mtx;
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static void cd9660_ihashrem __P((struct iso_node *));
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static unsigned cd9660_chars2ui __P((unsigned char *begin, int len));
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/*
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* Initialize hash links for inodes and dnodes.
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*/
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int
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cd9660_init(vfsp)
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struct vfsconf *vfsp;
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{
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isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash);
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mtx_init(&cd9660_ihash_mtx, "cd9660_ihash", MTX_DEF);
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return (0);
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}
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int
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cd9660_uninit(vfsp)
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struct vfsconf *vfsp;
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{
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if (isohashtbl != NULL)
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free(isohashtbl, M_ISOFSMNT);
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return (0);
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}
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/*
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* Use the device/inum pair to find the incore inode, and return a pointer
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* to it. If it is in core, but locked, wait for it.
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*/
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int
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cd9660_ihashget(dev, inum, flags, vpp)
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dev_t dev;
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ino_t inum;
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int flags;
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struct vnode **vpp;
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{
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struct thread *td = curthread; /* XXX */
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struct iso_node *ip;
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struct vnode *vp;
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int error;
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*vpp = NULL;
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loop:
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mtx_lock(&cd9660_ihash_mtx);
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for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
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if (inum == ip->i_number && dev == ip->i_dev) {
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vp = ITOV(ip);
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mtx_lock(&vp->v_interlock);
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mtx_unlock(&cd9660_ihash_mtx);
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error = vget(vp, flags | LK_INTERLOCK, td);
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if (error == ENOENT)
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goto loop;
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if (error)
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return (error);
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*vpp = vp;
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return (0);
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}
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}
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mtx_unlock(&cd9660_ihash_mtx);
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return (0);
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}
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/*
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* Insert the inode into the hash table, and return it locked.
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*/
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void
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cd9660_ihashins(ip)
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struct iso_node *ip;
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{
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struct iso_node **ipp, *iq;
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mtx_lock(&cd9660_ihash_mtx);
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ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
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if ((iq = *ipp) != NULL)
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iq->i_prev = &ip->i_next;
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ip->i_next = iq;
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ip->i_prev = ipp;
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*ipp = ip;
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mtx_unlock(&cd9660_ihash_mtx);
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lockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE, (struct mtx *)0, curthread);
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}
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/*
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* Remove the inode from the hash table.
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*/
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static void
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cd9660_ihashrem(ip)
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register struct iso_node *ip;
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{
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register struct iso_node *iq;
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mtx_lock(&cd9660_ihash_mtx);
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if ((iq = ip->i_next) != NULL)
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iq->i_prev = ip->i_prev;
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*ip->i_prev = iq;
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#ifdef DIAGNOSTIC
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ip->i_next = NULL;
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ip->i_prev = NULL;
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#endif
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mtx_unlock(&cd9660_ihash_mtx);
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}
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/*
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* Last reference to an inode, write the inode out and if necessary,
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* truncate and deallocate the file.
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*/
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int
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cd9660_inactive(ap)
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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struct thread *a_td;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct thread *td = ap->a_td;
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register struct iso_node *ip = VTOI(vp);
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int error = 0;
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if (prtactive && vp->v_usecount != 0)
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vprint("cd9660_inactive: pushing active", vp);
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ip->i_flag = 0;
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VOP_UNLOCK(vp, 0, td);
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/*
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* If we are done with the inode, reclaim it
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* so that it can be reused immediately.
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*/
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if (ip->inode.iso_mode == 0)
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vrecycle(vp, NULL, td);
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return error;
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}
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/*
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* Reclaim an inode so that it can be used for other purposes.
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*/
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int
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cd9660_reclaim(ap)
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struct vop_reclaim_args /* {
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struct vnode *a_vp;
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struct thread *a_td;
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} */ *ap;
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{
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register struct vnode *vp = ap->a_vp;
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register struct iso_node *ip = VTOI(vp);
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if (prtactive && vp->v_usecount != 0)
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vprint("cd9660_reclaim: pushing active", vp);
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/*
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* Remove the inode from its hash chain.
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*/
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cd9660_ihashrem(ip);
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/*
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* Purge old data structures associated with the inode.
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*/
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cache_purge(vp);
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if (ip->i_devvp) {
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vrele(ip->i_devvp);
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ip->i_devvp = 0;
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}
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lockdestroy(&ip->i_vnode->v_lock);
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FREE(vp->v_data, M_ISOFSNODE);
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vp->v_data = NULL;
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return (0);
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}
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/*
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* File attributes
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*/
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void
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cd9660_defattr(isodir, inop, bp, ftype)
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struct iso_directory_record *isodir;
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struct iso_node *inop;
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struct buf *bp;
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enum ISO_FTYPE ftype;
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{
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struct buf *bp2 = NULL;
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struct iso_mnt *imp;
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struct iso_extended_attributes *ap = NULL;
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int off;
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/* high sierra does not have timezone data, flag is one byte ahead */
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if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
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&isodir->date[6]: isodir->flags)&2) {
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inop->inode.iso_mode = S_IFDIR;
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/*
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* If we return 2, fts() will assume there are no subdirectories
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* (just links for the path and .), so instead we return 1.
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*/
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inop->inode.iso_links = 1;
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} else {
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inop->inode.iso_mode = S_IFREG;
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inop->inode.iso_links = 1;
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}
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if (!bp
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&& ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
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&& (off = isonum_711(isodir->ext_attr_length))) {
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cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
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&bp2);
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bp = bp2;
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}
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if (bp) {
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ap = (struct iso_extended_attributes *)bp->b_data;
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if (isonum_711(ap->version) == 1) {
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if (!(ap->perm[0]&0x40))
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inop->inode.iso_mode |= VEXEC >> 6;
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if (!(ap->perm[0]&0x10))
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inop->inode.iso_mode |= VREAD >> 6;
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if (!(ap->perm[0]&4))
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inop->inode.iso_mode |= VEXEC >> 3;
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if (!(ap->perm[0]&1))
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inop->inode.iso_mode |= VREAD >> 3;
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if (!(ap->perm[1]&0x40))
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inop->inode.iso_mode |= VEXEC;
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if (!(ap->perm[1]&0x10))
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inop->inode.iso_mode |= VREAD;
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inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
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inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
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} else
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ap = NULL;
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}
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if (!ap) {
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inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
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inop->inode.iso_uid = (uid_t)0;
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inop->inode.iso_gid = (gid_t)0;
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}
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if (bp2)
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brelse(bp2);
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}
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/*
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* Time stamps
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*/
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void
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cd9660_deftstamp(isodir,inop,bp,ftype)
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struct iso_directory_record *isodir;
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struct iso_node *inop;
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struct buf *bp;
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enum ISO_FTYPE ftype;
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{
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struct buf *bp2 = NULL;
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struct iso_mnt *imp;
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struct iso_extended_attributes *ap = NULL;
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int off;
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if (!bp
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&& ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
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&& (off = isonum_711(isodir->ext_attr_length))) {
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cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
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&bp2);
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bp = bp2;
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}
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if (bp) {
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ap = (struct iso_extended_attributes *)bp->b_data;
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if (ftype != ISO_FTYPE_HIGH_SIERRA
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&& isonum_711(ap->version) == 1) {
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if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
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cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
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if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
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inop->inode.iso_ctime = inop->inode.iso_atime;
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if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
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inop->inode.iso_mtime = inop->inode.iso_ctime;
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} else
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ap = NULL;
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}
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if (!ap) {
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cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
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inop->inode.iso_atime = inop->inode.iso_ctime;
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inop->inode.iso_mtime = inop->inode.iso_ctime;
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}
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if (bp2)
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brelse(bp2);
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}
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int
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cd9660_tstamp_conv7(pi,pu,ftype)
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u_char *pi;
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struct timespec *pu;
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enum ISO_FTYPE ftype;
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{
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int crtime, days;
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int y, m, d, hour, minute, second, tz;
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y = pi[0] + 1900;
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m = pi[1];
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d = pi[2];
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hour = pi[3];
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minute = pi[4];
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second = pi[5];
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if(ftype != ISO_FTYPE_HIGH_SIERRA)
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tz = pi[6];
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else
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/* original high sierra misses timezone data */
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tz = 0;
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if (y < 1970) {
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pu->tv_sec = 0;
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pu->tv_nsec = 0;
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return 0;
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} else {
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#ifdef ORIGINAL
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/* computes day number relative to Sept. 19th,1989 */
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/* don't even *THINK* about changing formula. It works! */
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days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
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#else
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/*
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* Changed :-) to make it relative to Jan. 1st, 1970
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* and to disambiguate negative division
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*/
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days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
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#endif
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crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
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/* timezone offset is unreliable on some disks */
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if (-48 <= tz && tz <= 52)
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crtime -= tz * 15 * 60;
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}
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pu->tv_sec = crtime;
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pu->tv_nsec = 0;
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return 1;
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}
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static u_int
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cd9660_chars2ui(begin,len)
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u_char *begin;
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int len;
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{
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u_int rc;
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for (rc = 0; --len >= 0;) {
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rc *= 10;
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rc += *begin++ - '0';
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}
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return rc;
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}
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int
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cd9660_tstamp_conv17(pi,pu)
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u_char *pi;
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struct timespec *pu;
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{
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u_char buf[7];
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/* year:"0001"-"9999" -> -1900 */
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buf[0] = cd9660_chars2ui(pi,4) - 1900;
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/* month: " 1"-"12" -> 1 - 12 */
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buf[1] = cd9660_chars2ui(pi + 4,2);
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/* day: " 1"-"31" -> 1 - 31 */
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buf[2] = cd9660_chars2ui(pi + 6,2);
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/* hour: " 0"-"23" -> 0 - 23 */
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buf[3] = cd9660_chars2ui(pi + 8,2);
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/* minute:" 0"-"59" -> 0 - 59 */
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buf[4] = cd9660_chars2ui(pi + 10,2);
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/* second:" 0"-"59" -> 0 - 59 */
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buf[5] = cd9660_chars2ui(pi + 12,2);
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/* difference of GMT */
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buf[6] = pi[16];
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return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
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}
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ino_t
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isodirino(isodir, imp)
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struct iso_directory_record *isodir;
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struct iso_mnt *imp;
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{
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ino_t ino;
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ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
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<< imp->im_bshift;
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return (ino);
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}
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