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convert to use lock manager
[unix-history] / usr / src / sys / isofs / cd9660 / cd9660_node.c
/*-
* Copyright (c) 1982, 1986, 1989, 1994, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley
* by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
* Support code is derived from software contributed to Berkeley
* by Atsushi Murai (amurai@spec.co.jp).
*
* %sccs.include.redist.c%
*
* @(#)cd9660_node.c 8.7 (Berkeley) %G%
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <isofs/cd9660/iso.h>
#include <isofs/cd9660/cd9660_node.h>
#include <isofs/cd9660/cd9660_mount.h>
#include <isofs/cd9660/iso_rrip.h>
/*
* Structures associated with iso_node caching.
*/
struct iso_node **isohashtbl;
u_long isohash;
#define INOHASH(device, inum) (((device) + ((inum)>>12)) & isohash)
struct simplelock cd9660_ihash_slock;
#ifdef ISODEVMAP
struct iso_node **idvhashtbl;
u_long idvhash;
#define DNOHASH(device, inum) (((device) + ((inum)>>12)) & idvhash)
#endif
int prtactive; /* 1 => print out reclaim of active vnodes */
/*
* Initialize hash links for inodes and dnodes.
*/
cd9660_init(vfsp)
struct vfsconf *vfsp;
{
isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash);
simple_lock_init(&cd9660_ihash_slock);
#ifdef ISODEVMAP
idvhashtbl = hashinit(desiredvnodes / 8, M_ISOFSMNT, &idvhash);
#endif
}
#ifdef ISODEVMAP
/*
* Enter a new node into the device hash list
*/
struct iso_dnode *
iso_dmap(device, inum, create)
dev_t device;
ino_t inum;
int create;
{
register struct iso_dnode **dpp, *dp, *dq;
dpp = &idvhashtbl[DNOHASH(device, inum)];
for (dp = *dpp;; dp = dp->d_next) {
if (dp == NULL)
return (NULL);
if (inum == dp->i_number && device == dp->i_dev)
return (dp);
if (!create)
return (NULL);
MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE,
M_WAITOK);
dp->i_dev = dev;
dp->i_number = ino;
if (dq = *dpp)
dq->d_prev = dp->d_next;
dp->d_next = dq;
dp->d_prev = dpp;
*dpp = dp;
return (dp);
}
void
iso_dunmap(device)
dev_t device;
{
struct iso_dnode **dpp, *dp, *dq;
for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) {
for (dp = *dpp; dp != NULL; dp = dq)
dq = dp->d_next;
if (device == dp->i_dev) {
if (dq)
dq->d_prev = dp->d_prev;
*dp->d_prev = dq;
FREE(dp, M_CACHE);
}
}
}
}
#endif
/*
* Use the device/inum pair to find the incore inode, and return a pointer
* to it. If it is in core, but locked, wait for it.
*/
struct vnode *
cd9660_ihashget(dev, inum)
dev_t dev;
ino_t inum;
{
struct proc *p = curproc; /* XXX */
struct iso_node *ip;
struct vnode *vp;
loop:
simple_lock(&cd9660_ihash_slock);
for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) {
if (inum == ip->i_number && dev == ip->i_dev) {
vp = ITOV(ip);
simple_lock(&vp->v_interlock);
simple_unlock(&cd9660_ihash_slock);
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p))
goto loop;
return (vp);
}
}
simple_unlock(&cd9660_ihash_slock);
return (NULL);
}
/*
* Insert the inode into the hash table, and return it locked.
*/
void
cd9660_ihashins(ip)
struct iso_node *ip;
{
struct proc *p = curproc; /* XXX */
struct iso_node **ipp, *iq;
simple_lock(&cd9660_ihash_slock);
ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
if (iq = *ipp)
iq->i_prev = &ip->i_next;
ip->i_next = iq;
ip->i_prev = ipp;
*ipp = ip;
simple_unlock(&cd9660_ihash_slock);
lockmgr(&ip->i_lock, LK_EXCLUSIVE, (struct simplelock *)0, p);
}
/*
* Remove the inode from the hash table.
*/
void
cd9660_ihashrem(ip)
register struct iso_node *ip;
{
register struct iso_node *iq;
simple_lock(&cd9660_ihash_slock);
if (iq = ip->i_next)
iq->i_prev = ip->i_prev;
*ip->i_prev = iq;
#ifdef DIAGNOSTIC
ip->i_next = NULL;
ip->i_prev = NULL;
#endif
simple_unlock(&cd9660_ihash_slock);
}
/*
* Last reference to an inode, write the inode out and if necessary,
* truncate and deallocate the file.
*/
int
cd9660_inactive(ap)
struct vop_inactive_args /* {
struct vnode *a_vp;
struct proc *a_p;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
register struct iso_node *ip = VTOI(vp);
int mode, error = 0;
if (prtactive && vp->v_usecount != 0)
vprint("cd9660_inactive: pushing active", vp);
ip->i_flag = 0;
/*
* If we are done with the inode, reclaim it
* so that it can be reused immediately.
*/
if (vp->v_usecount == 0 && ip->inode.iso_mode == 0)
vgone(vp);
return error;
}
/*
* Reclaim an inode so that it can be used for other purposes.
*/
int
cd9660_reclaim(ap)
struct vop_reclaim_args /* {
struct vnode *a_vp;
struct proc *a_p;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct iso_node *ip = VTOI(vp);
int i;
if (prtactive && vp->v_usecount != 0)
vprint("cd9660_reclaim: pushing active", vp);
/*
* Remove the inode from its hash chain.
*/
cd9660_ihashrem(ip);
/*
* Purge old data structures associated with the inode.
*/
cache_purge(vp);
if (ip->i_devvp) {
vrele(ip->i_devvp);
ip->i_devvp = 0;
}
FREE(vp->v_data, M_ISOFSNODE);
vp->v_data = NULL;
return (0);
}
/*
* File attributes
*/
void
cd9660_defattr(isodir, inop, bp)
struct iso_directory_record *isodir;
struct iso_node *inop;
struct buf *bp;
{
struct buf *bp2 = NULL;
struct iso_mnt *imp;
struct iso_extended_attributes *ap = NULL;
int off;
if (isonum_711(isodir->flags)&2) {
inop->inode.iso_mode = S_IFDIR;
/*
* If we return 2, fts() will assume there are no subdirectories
* (just links for the path and .), so instead we return 1.
*/
inop->inode.iso_links = 1;
} else {
inop->inode.iso_mode = S_IFREG;
inop->inode.iso_links = 1;
}
if (!bp
&& ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
&& (off = isonum_711(isodir->ext_attr_length))) {
VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
&bp2);
bp = bp2;
}
if (bp) {
ap = (struct iso_extended_attributes *)bp->b_data;
if (isonum_711(ap->version) == 1) {
if (!(ap->perm[0]&0x40))
inop->inode.iso_mode |= VEXEC >> 6;
if (!(ap->perm[0]&0x10))
inop->inode.iso_mode |= VREAD >> 6;
if (!(ap->perm[0]&4))
inop->inode.iso_mode |= VEXEC >> 3;
if (!(ap->perm[0]&1))
inop->inode.iso_mode |= VREAD >> 3;
if (!(ap->perm[1]&0x40))
inop->inode.iso_mode |= VEXEC;
if (!(ap->perm[1]&0x10))
inop->inode.iso_mode |= VREAD;
inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
} else
ap = NULL;
}
if (!ap) {
inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
inop->inode.iso_uid = (uid_t)0;
inop->inode.iso_gid = (gid_t)0;
}
if (bp2)
brelse(bp2);
}
/*
* Time stamps
*/
void
cd9660_deftstamp(isodir,inop,bp)
struct iso_directory_record *isodir;
struct iso_node *inop;
struct buf *bp;
{
struct buf *bp2 = NULL;
struct iso_mnt *imp;
struct iso_extended_attributes *ap = NULL;
int off;
if (!bp
&& ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
&& (off = isonum_711(isodir->ext_attr_length))) {
VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
&bp2);
bp = bp2;
}
if (bp) {
ap = (struct iso_extended_attributes *)bp->b_data;
if (isonum_711(ap->version) == 1) {
if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
inop->inode.iso_ctime = inop->inode.iso_atime;
if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
inop->inode.iso_mtime = inop->inode.iso_ctime;
} else
ap = NULL;
}
if (!ap) {
cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
inop->inode.iso_atime = inop->inode.iso_ctime;
inop->inode.iso_mtime = inop->inode.iso_ctime;
}
if (bp2)
brelse(bp2);
}
int
cd9660_tstamp_conv7(pi,pu)
u_char *pi;
struct timespec *pu;
{
int i;
int crtime, days;
int y, m, d, hour, minute, second, tz;
y = pi[0] + 1900;
m = pi[1];
d = pi[2];
hour = pi[3];
minute = pi[4];
second = pi[5];
tz = pi[6];
if (y < 1970) {
pu->ts_sec = 0;
pu->ts_nsec = 0;
return 0;
} else {
#ifdef ORIGINAL
/* computes day number relative to Sept. 19th,1989 */
/* don't even *THINK* about changing formula. It works! */
days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
#else
/*
* Changed :-) to make it relative to Jan. 1st, 1970
* and to disambiguate negative division
*/
days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
#endif
crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
/* timezone offset is unreliable on some disks */
if (-48 <= tz && tz <= 52)
crtime -= tz * 15 * 60;
}
pu->ts_sec = crtime;
pu->ts_nsec = 0;
return 1;
}
static u_int
cd9660_chars2ui(begin,len)
u_char *begin;
int len;
{
u_int rc;
for (rc = 0; --len >= 0;) {
rc *= 10;
rc += *begin++ - '0';
}
return rc;
}
int
cd9660_tstamp_conv17(pi,pu)
u_char *pi;
struct timespec *pu;
{
u_char buf[7];
/* year:"0001"-"9999" -> -1900 */
buf[0] = cd9660_chars2ui(pi,4) - 1900;
/* month: " 1"-"12" -> 1 - 12 */
buf[1] = cd9660_chars2ui(pi + 4,2);
/* day: " 1"-"31" -> 1 - 31 */
buf[2] = cd9660_chars2ui(pi + 6,2);
/* hour: " 0"-"23" -> 0 - 23 */
buf[3] = cd9660_chars2ui(pi + 8,2);
/* minute:" 0"-"59" -> 0 - 59 */
buf[4] = cd9660_chars2ui(pi + 10,2);
/* second:" 0"-"59" -> 0 - 59 */
buf[5] = cd9660_chars2ui(pi + 12,2);
/* difference of GMT */
buf[6] = pi[16];
return cd9660_tstamp_conv7(buf,pu);
}
ino_t
isodirino(isodir, imp)
struct iso_directory_record *isodir;
struct iso_mnt *imp;
{
ino_t ino;
ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
<< imp->im_bshift;
return (ino);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.