Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/isofs/isofs_vnops.c

843 lines
18 KiB
C
Raw Blame History

/*
* $Id: isofs_vnops.c,v 1.18 1994/05/24 02:38:39 cgd Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/dir.h>
#include <miscfs/specfs/specdev.h> /* XXX */
#include <miscfs/fifofs/fifo.h> /* XXX */
#include <isofs/iso.h>
#include <isofs/isofs_node.h>
#include <isofs/iso_rrip.h>
/*
* Mknod vnode call
* Actually remap the device number
*/
/* ARGSUSED */
isofs_mknod(ndp, vap, cred, p)
struct nameidata *ndp;
struct ucred *cred;
struct vattr *vap;
struct proc *p;
{
#ifndef ISODEVMAP
free(ndp->ni_pnbuf, M_NAMEI);
vput(ndp->ni_dvp);
vput(ndp->ni_vp);
return EINVAL;
#else
register struct vnode *vp;
struct iso_node *ip;
struct iso_dnode *dp;
int error;
vp = ndp->ni_vp;
ip = VTOI(vp);
if (ip->i_mnt->iso_ftype != ISO_FTYPE_RRIP
|| vap->va_type != vp->v_type
|| (vap->va_type != VCHR && vap->va_type != VBLK)) {
free(ndp->ni_pnbuf, M_NAMEI);
vput(ndp->ni_dvp);
vput(ndp->ni_vp);
return EINVAL;
}
dp = iso_dmap(ip->i_dev,ip->i_number,1);
if (ip->inode.iso_rdev == vap->va_rdev || vap->va_rdev == VNOVAL) {
/* same as the unmapped one, delete the mapping */
remque(dp);
FREE(dp,M_CACHE);
} else
/* enter new mapping */
dp->d_dev = vap->va_rdev;
/*
* Remove inode so that it will be reloaded by iget and
* checked to see if it is an alias of an existing entry
* in the inode cache.
*/
vput(vp);
vp->v_type = VNON;
vgone(vp);
return (0);
#endif
}
/*
* Open called.
*
* Nothing to do.
*/
/* ARGSUSED */
isofs_open(vp, mode, cred, p)
struct vnode *vp;
int mode;
struct ucred *cred;
struct proc *p;
{
return (0);
}
/*
* Close called
*
* Update the times on the inode on writeable file systems.
*/
/* ARGSUSED */
isofs_close(vp, fflag, cred, p)
struct vnode *vp;
int fflag;
struct ucred *cred;
struct proc *p;
{
return (0);
}
/*
* Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
* The mode is shifted to select the owner/group/other fields. The
* super user is granted all permissions.
*/
isofs_access(vp, mode, cred, p)
struct vnode *vp;
register int mode;
struct ucred *cred;
struct proc *p;
{
register struct iso_node *ip = VTOI(vp);
register gid_t *gp;
int i;
if (cred->cr_uid == 0)
return 0;
if (cred->cr_uid != ip->inode.iso_uid) {
mode >>= 3;
gp = cred->cr_groups;
for (i = 0; i < cred->cr_ngroups; i++, gp++)
if (ip->inode.iso_gid == *gp)
goto found;
mode >>= 3;
found:
;
}
return (ip->inode.iso_mode & mode) == mode ? 0 : EACCES;
}
/* ARGSUSED */
isofs_getattr(vp, vap, cred, p)
struct vnode *vp;
register struct vattr *vap;
struct ucred *cred;
struct proc *p;
{
register struct iso_node *ip = VTOI(vp);
int i;
vap->va_fsid = ip->i_dev;
vap->va_fileid = ip->i_number;
vap->va_mode = ip->inode.iso_mode;
vap->va_nlink = ip->inode.iso_links;
vap->va_uid = ip->inode.iso_uid;
vap->va_gid = ip->inode.iso_gid;
TIMEVAL_TO_TIMESPEC(&ip->inode.iso_atime, &vap->va_atime);
TIMEVAL_TO_TIMESPEC(&ip->inode.iso_mtime, &vap->va_mtime);
TIMEVAL_TO_TIMESPEC(&ip->inode.iso_ctime, &vap->va_ctime);
vap->va_rdev = ip->inode.iso_rdev;
vap->va_size = ip->i_size;
vap->va_flags = 0;
vap->va_gen = 1;
vap->va_blocksize = ip->i_mnt->logical_block_size;
vap->va_bytes = ip->i_size;
vap->va_type = vp->v_type;
return (0);
}
/*
* Vnode op for reading.
*/
/* ARGSUSED */
isofs_read(vp, uio, ioflag, cred)
struct vnode *vp;
register struct uio *uio;
int ioflag;
struct ucred *cred;
{
register struct iso_node *ip = VTOI(vp);
register struct iso_mnt *imp;
struct buf *bp;
daddr_t lbn, bn, rablock;
int size, diff, error = 0;
long n, on, type;
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset < 0)
return (EINVAL);
ip->i_flag |= IACC;
imp = ip->i_mnt;
do {
lbn = iso_lblkno(imp, uio->uio_offset);
on = iso_blkoff(imp, uio->uio_offset);
n = min((unsigned)(imp->logical_block_size - on), uio->uio_resid);
diff = ip->i_size - uio->uio_offset;
if (diff <= 0)
return (0);
if (diff < n)
n = diff;
size = iso_blksize(imp, ip, lbn);
rablock = lbn + 1;
if (vp->v_lastr + 1 == lbn &&
iso_lblktosize(imp, rablock) < ip->i_size)
error = breada(ITOV(ip), lbn, size, rablock,
iso_blksize(imp, ip, rablock), NOCRED, &bp);
else
error = bread(ITOV(ip), lbn, size, NOCRED, &bp);
vp->v_lastr = lbn;
n = min(n, size - bp->b_resid);
if (error) {
brelse(bp);
return (error);
}
error = uiomove(bp->b_un.b_addr + on, (int)n, uio);
if (n + on == imp->logical_block_size || uio->uio_offset == ip->i_size)
bp->b_flags |= B_AGE;
brelse(bp);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
return (error);
}
/* ARGSUSED */
isofs_ioctl(vp, com, data, fflag, cred, p)
struct vnode *vp;
int com;
caddr_t data;
int fflag;
struct ucred *cred;
struct proc *p;
{
printf("You did ioctl for isofs !!\n");
return (ENOTTY);
}
/* ARGSUSED */
isofs_select(vp, which, fflags, cred, p)
struct vnode *vp;
int which, fflags;
struct ucred *cred;
struct proc *p;
{
/*
* We should really check to see if I/O is possible.
*/
return (1);
}
/*
* Mmap a file
*
* NB Currently unsupported.
*/
/* ARGSUSED */
isofs_mmap(vp, fflags, cred, p)
struct vnode *vp;
int fflags;
struct ucred *cred;
struct proc *p;
{
return (EINVAL);
}
/*
* Seek on a file
*
* Nothing to do, so just return.
*/
/* ARGSUSED */
isofs_seek(vp, oldoff, newoff, cred)
struct vnode *vp;
off_t oldoff, newoff;
struct ucred *cred;
{
return (0);
}
/*
* Structure for reading directories
*/
struct isoreaddir {
struct dirent saveent;
struct dirent assocent;
struct dirent current;
off_t saveoff;
off_t assocoff;
off_t curroff;
struct uio *uio;
off_t uio_off;
u_int *cookiep;
int ncookies;
int eof;
};
static int
iso_uiodir(idp,dp,off)
struct isoreaddir *idp;
struct dirent *dp;
off_t off;
{
int error;
dp->d_name[dp->d_namlen] = 0;
dp->d_reclen = DIRSIZ(dp);
if (idp->uio->uio_resid < dp->d_reclen) {
idp->eof = 0;
return -1;
}
if (idp->cookiep) {
if (idp->ncookies <= 0) {
idp->eof = 0;
return -1;
}
*idp->cookiep++ = off;
--idp->ncookies;
}
if (error = uiomove(dp,dp->d_reclen,idp->uio))
return error;
idp->uio_off = off;
return 0;
}
static int
iso_shipdir(idp)
struct isoreaddir *idp;
{
struct dirent *dp;
int cl, sl, assoc;
int error;
char *cname, *sname;
cl = idp->current.d_namlen;
cname = idp->current.d_name;
if (assoc = cl > 1 && *cname == ASSOCCHAR) {
cl--;
cname++;
}
dp = &idp->saveent;
sname = dp->d_name;
if (!(sl = dp->d_namlen)) {
dp = &idp->assocent;
sname = dp->d_name + 1;
sl = dp->d_namlen - 1;
}
if (sl > 0) {
if (sl != cl
|| bcmp(sname,cname,sl)) {
if (idp->assocent.d_namlen) {
if (error = iso_uiodir(idp,&idp->assocent,idp->assocoff))
return error;
idp->assocent.d_namlen = 0;
}
if (idp->saveent.d_namlen) {
if (error = iso_uiodir(idp,&idp->saveent,idp->saveoff))
return error;
idp->saveent.d_namlen = 0;
}
}
}
idp->current.d_reclen = DIRSIZ(&idp->current);
if (assoc) {
idp->assocoff = idp->curroff;
bcopy(&idp->current,&idp->assocent,idp->current.d_reclen);
} else {
idp->saveoff = idp->curroff;
bcopy(&idp->current,&idp->saveent,idp->current.d_reclen);
}
return 0;
}
/*
* Vnode op for readdir
*/
isofs_readdir(vp, uio, cred, eofflagp, cookies, ncookies)
struct vnode *vp;
register struct uio *uio;
struct ucred *cred;
int *eofflagp;
u_int *cookies;
int ncookies;
{
struct isoreaddir *idp;
int entryoffsetinblock;
int error = 0;
int endsearch;
struct iso_directory_record *ep;
int reclen;
struct iso_mnt *imp;
struct iso_node *ip;
struct buf *bp = NULL;
ip = VTOI (vp);
imp = ip->i_mnt;
MALLOC(idp,struct isoreaddir *,sizeof(*idp),M_TEMP,M_WAITOK);
idp->saveent.d_namlen = 0;
idp->assocent.d_namlen = 0;
idp->uio = uio;
idp->cookiep = cookies;
idp->ncookies = ncookies;
idp->curroff = uio->uio_offset;
idp->eof = 1;
entryoffsetinblock = iso_blkoff(imp, idp->curroff);
if (entryoffsetinblock != 0) {
if (error = iso_blkatoff(ip, idp->curroff, &bp)) {
FREE(idp,M_TEMP);
return (error);
}
}
endsearch = ip->i_size;
while (idp->curroff < endsearch) {
/*
* If offset is on a block boundary,
* read the next directory block.
* Release previous if it exists.
*/
if (iso_blkoff(imp, idp->curroff) == 0) {
if (bp != NULL)
brelse(bp);
if (error = iso_blkatoff(ip, idp->curroff, &bp))
break;
entryoffsetinblock = 0;
}
/*
* Get pointer to next entry.
*/
ep = (struct iso_directory_record *)
(bp->b_un.b_addr + entryoffsetinblock);
reclen = isonum_711 (ep->length);
if (reclen == 0) {
/* skip to next block, if any */
idp->curroff = roundup (idp->curroff,
imp->logical_block_size);
continue;
}
if (reclen < ISO_DIRECTORY_RECORD_SIZE) {
error = EINVAL;
/* illegal entry, stop */
break;
}
if (entryoffsetinblock + reclen > imp->logical_block_size) {
error = EINVAL;
/* illegal directory, so stop looking */
break;
}
idp->current.d_namlen = isonum_711 (ep->name_len);
if (isonum_711(ep->flags)&2)
isodirino(&idp->current.d_fileno,ep,imp);
else
idp->current.d_fileno = (bp->b_blkno << DEV_BSHIFT) + idp->curroff;
if (reclen < ISO_DIRECTORY_RECORD_SIZE + idp->current.d_namlen) {
error = EINVAL;
/* illegal entry, stop */
break;
}
idp->curroff += reclen;
/*
*
*/
switch (imp->iso_ftype) {
case ISO_FTYPE_RRIP:
isofs_rrip_getname(ep,idp->current.d_name,
&idp->current.d_namlen,
&idp->current.d_fileno,imp);
if (idp->current.d_namlen)
error = iso_uiodir(idp,&idp->current,idp->curroff);
break;
default: /* ISO_FTYPE_DEFAULT || ISO_FTYPE_9660 */
strcpy(idp->current.d_name,"..");
switch (ep->name[0]) {
case 0:
idp->current.d_namlen = 1;
error = iso_uiodir(idp,&idp->current,idp->curroff);
break;
case 1:
idp->current.d_namlen = 2;
error = iso_uiodir(idp,&idp->current,idp->curroff);
break;
default:
isofntrans(ep->name,idp->current.d_namlen,
idp->current.d_name,&idp->current.d_namlen,
imp->iso_ftype == ISO_FTYPE_9660,
isonum_711(ep->flags)&4);
if (imp->iso_ftype == ISO_FTYPE_DEFAULT)
error = iso_shipdir(idp);
else
error = iso_uiodir(idp,&idp->current,idp->curroff);
break;
}
}
if (error)
break;
entryoffsetinblock += reclen;
}
if (!error && imp->iso_ftype == ISO_FTYPE_DEFAULT) {
idp->current.d_namlen = 0;
error = iso_shipdir(idp);
}
if (error < 0)
error = 0;
if (bp)
brelse (bp);
uio->uio_offset = idp->uio_off;
*eofflagp = idp->eof;
FREE(idp,M_TEMP);
return (error);
}
/*
* Return target name of a symbolic link
* Shouldn't we get the parent vnode and read the data from there?
* This could eventually result in deadlocks in isofs_lookup.
* But otherwise the block read here is in the block buffer two times.
*/
typedef struct iso_directory_record ISODIR;
typedef struct iso_node ISONODE;
typedef struct iso_mnt ISOMNT;
int isofs_readlink(vp, uio, cred)
struct vnode *vp;
struct uio *uio;
struct ucred *cred;
{
ISONODE *ip;
ISODIR *dirp;
ISOMNT *imp;
struct buf *bp;
u_short symlen;
int error;
char *symname;
ino_t ino;
ip = VTOI(vp);
imp = ip->i_mnt;
if (imp->iso_ftype != ISO_FTYPE_RRIP)
return EINVAL;
/*
* Get parents directory record block that this inode included.
*/
error = bread(imp->im_devvp,
(daddr_t)((ip->i_number&~imp->im_bmask) / DEV_BSIZE),
imp->logical_block_size,
NOCRED,
&bp);
if (error) {
brelse(bp);
return EINVAL;
}
/*
* Setup the directory pointer for this inode
*/
dirp = (ISODIR *)(bp->b_un.b_addr + (ip->i_number & imp->im_bmask));
#ifdef DEBUG
printf("lbn=%d,off=%d,bsize=%d,DEV_BSIZE=%d, dirp= %08x, b_addr=%08x, offset=%08x(%08x)\n",
(daddr_t)(ip->i_number >> imp->im_bshift),
ip->i_number & imp->im_bmask,
imp->logical_block_size,
DEV_BSIZE,
dirp,
bp->b_un.b_addr,
ip->i_number,
ip->i_number & imp->im_bmask );
#endif
/*
* Just make sure, we have a right one....
* 1: Check not cross boundary on block
*/
if ((ip->i_number & imp->im_bmask) + isonum_711(dirp->length)
> imp->logical_block_size) {
brelse(bp);
return EINVAL;
}
/*
* Now get a buffer
* Abuse a namei buffer for now.
*/
MALLOC(symname,char *,MAXPATHLEN,M_NAMEI,M_WAITOK);
/*
* Ok, we just gathering a symbolic name in SL record.
*/
if (isofs_rrip_getsymname(dirp,symname,&symlen,imp) == 0) {
FREE(symname,M_NAMEI);
brelse(bp);
return EINVAL;
}
/*
* Don't forget before you leave from home ;-)
*/
brelse(bp);
/*
* return with the symbolic name to caller's.
*/
error = uiomove(symname,symlen,uio);
FREE(symname,M_NAMEI);
return error;
}
/*
* Ufs abort op, called after namei() when a CREATE/DELETE isn't actually
* done. If a buffer has been saved in anticipation of a CREATE, delete it.
*/
/* ARGSUSED */
isofs_abortop(ndp)
struct nameidata *ndp;
{
if ((ndp->ni_nameiop & (HASBUF | SAVESTART)) == HASBUF)
FREE(ndp->ni_pnbuf, M_NAMEI);
return 0;
}
/*
* Lock an inode.
*/
isofs_lock(vp)
struct vnode *vp;
{
register struct iso_node *ip = VTOI(vp);
ISO_ILOCK(ip);
return 0;
}
/*
* Unlock an inode.
*/
isofs_unlock(vp)
struct vnode *vp;
{
register struct iso_node *ip = VTOI(vp);
if (!(ip->i_flag & ILOCKED))
panic("isofs_unlock NOT LOCKED");
ISO_IUNLOCK(ip);
return 0;
}
/*
* Check for a locked inode.
*/
isofs_islocked(vp)
struct vnode *vp;
{
if (VTOI(vp)->i_flag & ILOCKED)
return 1;
return 0;
}
/*
* Calculate the logical to physical mapping if not done already,
* then call the device strategy routine.
*/
isofs_strategy(bp)
register struct buf *bp;
{
register struct iso_node *ip = VTOI(bp->b_vp);
struct vnode *vp;
int error;
if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR)
panic("isofs_strategy: spec");
if (bp->b_blkno == bp->b_lblkno) {
if (error = iso_bmap(ip, bp->b_lblkno, &bp->b_blkno))
return error;
if ((long)bp->b_blkno == -1)
clrbuf(bp);
}
if ((long)bp->b_blkno == -1) {
biodone(bp);
return 0;
}
vp = ip->i_devvp;
bp->b_dev = vp->v_rdev;
(*(vp->v_op->vop_strategy))(bp);
return 0;
}
/*
* Print out the contents of an inode.
*/
int
isofs_print(vp)
struct vnode *vp;
{
printf("tag VT_ISOFS, isofs vnode\n");
return (0);
}
extern int enodev ();
/*
* Global vfs data structures for isofs
*/
struct vnodeops isofs_vnodeops = {
isofs_lookup, /* lookup */
(void *)enodev, /* create */
(void *)enodev, /* mknod */
isofs_open, /* open */
isofs_close, /* close */
isofs_access, /* access */
isofs_getattr, /* getattr */
(void *)enodev, /* setattr */
isofs_read, /* read */
(void *)enodev, /* write */
isofs_ioctl, /* ioctl */
isofs_select, /* select */
isofs_mmap, /* mmap */
(void *)nullop, /* fsync */
isofs_seek, /* seek */
(void *)enodev, /* remove */
(void *)enodev, /* link */
(void *)enodev, /* rename */
(void *)enodev, /* mkdir */
(void *)enodev, /* rmdir */
(void *)enodev, /* symlink */
isofs_readdir, /* readdir */
isofs_readlink, /* readlink */
isofs_abortop, /* abortop */
isofs_inactive, /* inactive */
isofs_reclaim, /* reclaim */
isofs_lock, /* lock */
isofs_unlock, /* unlock */
(void *)enodev, /* bmap */
isofs_strategy, /* strategy */
isofs_print, /* print */
isofs_islocked, /* islocked */
(void *)enodev, /* advlock */
};
struct vnodeops isofs_spec_inodeops = {
spec_lookup, /* lookup */
(void *)enodev, /* create */
(void *)enodev, /* mknod */
spec_open, /* open */
spec_close, /* close */
isofs_access, /* access */
isofs_getattr, /* getattr */
(void *)enodev, /* setattr */
spec_read, /* read */
spec_write, /* write */
spec_ioctl, /* ioctl */
spec_select, /* select */
spec_mmap, /* mmap */
spec_fsync, /* fsync */
spec_seek, /* seek */
(void *)enodev, /* remove */
(void *)enodev, /* link */
(void *)enodev, /* rename */
(void *)enodev, /* mkdir */
(void *)enodev, /* rmdir */
(void *)enodev, /* symlink */
spec_readdir, /* readdir */
spec_readlink, /* readlink */
spec_abortop, /* abortop */
isofs_inactive, /* inactive */
isofs_reclaim, /* reclaim */
isofs_lock, /* lock */
isofs_unlock, /* unlock */
(void *)enodev, /* bmap */
spec_strategy, /* strategy */
isofs_print, /* print */
isofs_islocked, /* islocked */
spec_advlock, /* advlock */
};
#ifdef FIFO
struct vnodeops isofs_fifo_inodeops = {
fifo_lookup, /* lookup */
(void *)enodev, /* create */
(void *)enodev, /* mknod */
fifo_open, /* open */
fifo_close, /* close */
isofs_access, /* access */
isofs_getattr, /* getattr */
(void *)enodev, /* setattr */
fifo_read, /* read */
fifo_write, /* write */
fifo_ioctl, /* ioctl */
fifo_select, /* select */
fifo_mmap, /* mmap */
fifo_fsync, /* fsync */
fifo_seek, /* seek */
(void *)enodev, /* remove */
(void *)enodev, /* link */
(void *)enodev, /* rename */
(void *)enodev, /* mkdir */
(void *)enodev, /* rmdir */
(void *)enodev, /* symlink */
fifo_readdir, /* readdir */
fifo_readlink, /* readlink */
fifo_abortop, /* abortop */
isofs_inactive, /* inactive */
isofs_reclaim, /* reclaim */
isofs_lock, /* lock */
isofs_unlock, /* unlock */
(void *)enodev, /* bmap */
fifo_strategy, /* strategy */
isofs_print, /* print */
isofs_islocked, /* islocked */
fifo_advlock, /* advlock */
};
#endif /* FIFO */
Reference in New Issue View Git Blame Copy Permalink