static int
cd9660_ino_alloc(struct mount *mp, void *arg, int lkflags,
struct vnode **vpp)
{
struct cd9660_ino_alloc_arg *dd_arg;
dd_arg = arg;
return (cd9660_vget_internal(mp, dd_arg->i_ino, lkflags, vpp,
dd_arg->i_ino != dd_arg->ino, dd_arg->ep));
}
/*
* Return root of a filesystem
*/
int
cd9660_root(struct mount *mp, struct vnode **vpp)
{
struct iso_mnt *imp = VFSTOISOFS(mp);
struct iso_directory_record *dp =
(struct iso_directory_record *)imp->root;
ino_t ino = isodirino(dp, imp);
/*
* With RRIP we must use the `.' entry of the root directory.
* Simply tell vget, that it's a relocated directory.
*/
return (cd9660_vget_internal(mp, ino, vpp,
imp->iso_ftype == ISO_FTYPE_RRIP, dp));
}
int
cd9660_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
{
/*
* XXXX
* It would be nice if we didn't always set the `relocated' flag
* and force the extra read, but I don't want to think about fixing
* that right now.
*/
return (cd9660_vget_internal(mp, ino, vpp,
#if 0
VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
#else
0,
#endif
NULL));
}
/*
* Convert a component of a pathname into a pointer to a locked inode.
* This is a very central and rather complicated routine.
* If the file system is not maintained in a strict tree hierarchy,
* this can result in a deadlock situation (see comments in code below).
*
* The flag argument is LOOKUP, CREATE, RENAME, or DELETE depending on
* whether the name is to be looked up, created, renamed, or deleted.
* When CREATE, RENAME, or DELETE is specified, information usable in
* creating, renaming, or deleting a directory entry may be calculated.
* If flag has LOCKPARENT or'ed into it and the target of the pathname
* exists, lookup returns both the target and its parent directory locked.
* When creating or renaming and LOCKPARENT is specified, the target may
* not be ".". When deleting and LOCKPARENT is specified, the target may
* be "."., but the caller must check to ensure it does an vrele and iput
* instead of two iputs.
*
* Overall outline of ufs_lookup:
*
* check accessibility of directory
* look for name in cache, if found, then if at end of path
* and deleting or creating, drop it, else return name
* search for name in directory, to found or notfound
* notfound:
* if creating, return locked directory, leaving info on available slots
* else return error
* found:
* if at end of path and deleting, return information to allow delete
* if at end of path and rewriting (RENAME and LOCKPARENT), lock target
* inode and return info to allow rewrite
* if not at end, add name to cache; if at end and neither creating
* nor deleting, add name to cache
*
* NOTE: (LOOKUP | LOCKPARENT) currently returns the parent inode unlocked.
*/
int
cd9660_lookup(struct vnop_lookup_args *ap)
{
register struct vnode *vdp; /* vnode for directory being searched */
register struct iso_node *dp; /* inode for directory being searched */
register struct iso_mnt *imp; /* file system that directory is in */
struct buf *bp; /* a buffer of directory entries */
struct iso_directory_record *ep = NULL;/* the current directory entry */
int entryoffsetinblock; /* offset of ep in bp's buffer */
int saveoffset = 0; /* offset of last directory entry in dir */
int numdirpasses; /* strategy for directory search */
doff_t endsearch; /* offset to end directory search */
struct vnode *pdp; /* saved dp during symlink work */
struct vnode *tdp; /* returned by cd9660_vget_internal */
u_long bmask; /* block offset mask */
int lockparent; /* 1 => lockparent flag is set */
int wantparent; /* 1 => wantparent or lockparent flag */
int wantassoc;
int error;
ino_t ino = 0;
int reclen;
u_short namelen;
int isoflags;
char altname[ISO_RRIP_NAMEMAX];
int res;
int len;
char *name;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
int flags = cnp->cn_flags;
int nameiop = cnp->cn_nameiop;
vfs_context_t ctx = cnp->cn_context;
size_t altlen;
bp = NULL;
*vpp = NULL;
vdp = ap->a_dvp;
dp = VTOI(vdp);
imp = dp->i_mnt;
lockparent = flags & LOCKPARENT;
wantparent = flags & (LOCKPARENT|WANTPARENT);
wantassoc = 0;
/*
* We now have a segment name to search for, and a directory to search.
*
* Before tediously performing a linear scan of the directory,
* check the name cache to see if the directory/name pair
* we are looking for is known already.
*/
if ((error = cache_lookup(vdp, vpp, cnp))) {
if (error == ENOENT)
return (error);
return (0);
}
len = cnp->cn_namelen;
name = cnp->cn_nameptr;
altname[0] = '\0';
/*
* A "._" prefix means, we are looking for an associated file
*/
if (imp->iso_ftype != ISO_FTYPE_RRIP &&
*name == ASSOCCHAR1 && *(name+1) == ASSOCCHAR2) {
wantassoc = 1;
len -= 2;
name += 2;
}
/*
* Decode search name into UCS-2 (Unicode)
*/
if ((imp->iso_ftype == ISO_FTYPE_JOLIET) &&
!((len == 1 && *name == '.') || (flags & ISDOTDOT))) {
int flags1 = UTF_PRECOMPOSED;
(void) utf8_decodestr(name, len, (u_int16_t*) altname, &altlen,
sizeof(altname), 0, flags1);
name = altname;
len = altlen;
}
/*
* If there is cached information on a previous search of
* this directory, pick up where we last left off.
* We cache only lookups as these are the most common
* and have the greatest payoff. Caching CREATE has little
* benefit as it usually must search the entire directory
* to determine that the entry does not exist. Caching the
* location of the last DELETE or RENAME has not reduced
* profiling time and hence has been removed in the interest
* of simplicity.
*/
bmask = imp->im_sector_size - 1;
if (nameiop != LOOKUP || dp->i_diroff == 0 ||
dp->i_diroff > dp->i_size) {
entryoffsetinblock = 0;
dp->i_offset = 0;
numdirpasses = 1;
} else {
dp->i_offset = dp->i_diroff;
if ((entryoffsetinblock = dp->i_offset & bmask) &&
(error = cd9660_blkatoff(vdp, SECTOFF(imp, dp->i_offset), NULL, &bp)))
return (error);
numdirpasses = 2;
iso_nchstats.ncs_2passes++;
}
endsearch = dp->i_size;
searchloop:
while (dp->i_offset < endsearch) {
/*
* If offset is on a block boundary,
* read the next directory block.
* Release previous if it exists.
*/
if ((dp->i_offset & bmask) == 0) {
if (bp != NULL)
buf_brelse(bp);
if ( (error = cd9660_blkatoff(vdp, SECTOFF(imp,dp->i_offset), NULL, &bp)) )
return (error);
entryoffsetinblock = 0;
}
/*
* Get pointer to next entry.
*/
ep = (struct iso_directory_record *)
((char *)0 + buf_dataptr(bp) + entryoffsetinblock);
reclen = isonum_711(ep->length);
if (reclen == 0) {
/* skip to next block, if any */
dp->i_offset =
(dp->i_offset & ~bmask) + imp->im_sector_size;
continue;
}
if (reclen < ISO_DIRECTORY_RECORD_SIZE) {
/* illegal entry, stop */
break;
}
if (entryoffsetinblock + reclen > imp->im_sector_size) {
/* entries are not allowed to cross sector boundaries */
break;
}
namelen = isonum_711(ep->name_len);
isoflags = isonum_711(ep->flags);
if (reclen < ISO_DIRECTORY_RECORD_SIZE + namelen)
/* illegal entry, stop */
break;
/*
* Check for a name match.
*/
if (imp->iso_ftype == ISO_FTYPE_RRIP) {
if (isoflags & directoryBit)
ino = isodirino(ep, imp);
else
ino = ((daddr_t)buf_blkno(bp) << imp->im_bshift) + entryoffsetinblock;
dp->i_ino = ino;
cd9660_rrip_getname(ep,altname,&namelen,&dp->i_ino,imp);
if (namelen == cnp->cn_namelen
&& !bcmp(name,altname,namelen))
goto found;
ino = 0;
} else {
if ((!(isoflags & associatedBit)) == !wantassoc) {
if ((len == 1
&& *name == '.')
|| (flags & ISDOTDOT)) {
if (namelen == 1
&& ep->name[0] == ((flags & ISDOTDOT) ? 1 : 0)) {
/*
* Save directory entry's inode number and
* release directory buffer.
*/
dp->i_ino = isodirino(ep, imp);
goto found;
}
if (namelen != 1
|| ep->name[0] != 0)
goto notfound;
} else if (imp->iso_ftype != ISO_FTYPE_JOLIET && !(res = isofncmp(name, len, ep->name, namelen))) {
if ( isoflags & directoryBit )
ino = isodirino(ep, imp);
else
ino = ((daddr_t)buf_blkno(bp) << imp->im_bshift) + entryoffsetinblock;
saveoffset = dp->i_offset;
} else if (imp->iso_ftype == ISO_FTYPE_JOLIET && !(res = ucsfncmp((u_int16_t*)name, len,
(u_int16_t*) ep->name, namelen))) {
if ( isoflags & directoryBit )
ino = isodirino(ep, imp);
else
ino = ((daddr_t)buf_blkno(bp) << imp->im_bshift) + entryoffsetinblock;
saveoffset = dp->i_offset;
} else if (ino)
goto foundino;
#ifdef NOSORTBUG /* On some CDs directory entries are not sorted correctly */
else if (res < 0)
goto notfound;
else if (res > 0 && numdirpasses == 2)
numdirpasses++;
#endif
}
}
dp->i_offset += reclen;
entryoffsetinblock += reclen;
} /* endwhile */
if (ino) {
foundino:
dp->i_ino = ino;
if (saveoffset != dp->i_offset) {
if (lblkno(imp, dp->i_offset) !=
lblkno(imp, saveoffset)) {
if (bp != NULL)
buf_brelse(bp);
if ( (error = cd9660_blkatoff(vdp, SECTOFF(imp, saveoffset), NULL, &bp)) )
return (error);
}
entryoffsetinblock = saveoffset & bmask;
ep = (struct iso_directory_record *)
((char *)0 + buf_dataptr(bp) + entryoffsetinblock);
dp->i_offset = saveoffset;
}
goto found;
}
notfound:
/*
* If we started in the middle of the directory and failed
* to find our target, we must check the beginning as well.
*/
if (numdirpasses == 2) {
numdirpasses--;
dp->i_offset = 0;
endsearch = dp->i_diroff;
goto searchloop;
}
if (bp != NULL)
buf_brelse(bp);
/*
* Insert name into cache (as non-existent) if appropriate.
*/
if (cnp->cn_flags & MAKEENTRY)
cache_enter(vdp, *vpp, cnp);
return (ENOENT);
found:
if (numdirpasses == 2)
iso_nchstats.ncs_pass2++;
/*
* Found component in pathname.
* If the final component of path name, save information
* in the cache as to where the entry was found.
*/
if ((flags & ISLASTCN) && nameiop == LOOKUP)
dp->i_diroff = dp->i_offset;
/*
* Step through the translation in the name. We do not `iput' the
* directory because we may need it again if a symbolic link
* is relative to the current directory. Instead we save it
* unlocked as "pdp". We must get the target inode before unlocking
* the directory to insure that the inode will not be removed
* before we get it. We prevent deadlock by always fetching
* inodes from the root, moving down the directory tree. Thus
* when following backward pointers ".." we must unlock the
* parent directory before getting the requested directory.
* There is a potential race condition here if both the current
* and parent directories are removed before the `iget' for the
* inode associated with ".." returns. We hope that this occurs
* infrequently since we cannot avoid this race condition without
* implementing a sophisticated deadlock detection algorithm.
* Note also that this simple deadlock detection scheme will not
* work if the file system has any hard links other than ".."
* that point backwards in the directory structure.
*/
pdp = vdp;
/*
* If ino is different from dp->i_ino,
* it's a relocated directory.
*/
if (flags & ISDOTDOT) {
error = cd9660_vget_internal(vnode_mount(vdp), dp->i_ino, &tdp, NULL, NULL,
dp->i_ino != ino, ep,
vfs_context_proc(ctx));
VTOI(tdp)->i_parent = VTOI(pdp)->i_number;
buf_brelse(bp);
*vpp = tdp;
} else if (dp->i_number == dp->i_ino) {
buf_brelse(bp);
vnode_get(vdp); /* we want ourself, ie "." */
*vpp = vdp;
} else {
error = cd9660_vget_internal(vnode_mount(vdp), dp->i_ino, &tdp, vdp, cnp,
dp->i_ino != ino, ep, vfs_context_proc(ctx));
/* save parent inode number */
VTOI(tdp)->i_parent = VTOI(pdp)->i_number;
buf_brelse(bp);
if (error)
return (error);
*vpp = tdp;
}
return (0);
}
/*
* Convert a component of a pathname into a pointer to a locked inode.
* This is a very central and rather complicated routine.
* If the file system is not maintained in a strict tree hierarchy,
* this can result in a deadlock situation (see comments in code below).
*
* The flag argument is LOOKUP, CREATE, RENAME, or DELETE depending on
* whether the name is to be looked up, created, renamed, or deleted.
* When CREATE, RENAME, or DELETE is specified, information usable in
* creating, renaming, or deleting a directory entry may be calculated.
* If the target of the pathname exists, lookup returns both the target
* and its parent directory locked.
* When creating or renaming, the target may * not be ".".
* When deleting , the target may be "."., but the caller must check
* to ensure it does an vrele and vput instead of two vputs.
*
* Overall outline of ufs_lookup:
*
* check accessibility of directory
* look for name in cache, if found, then if at end of path
* and deleting or creating, drop it, else return name
* search for name in directory, to found or notfound
* notfound:
* if creating, return locked directory, leaving info on available slots
* else return error
* found:
* if at end of path and deleting, return information to allow delete
* if at end of path and rewriting (RENAME), lock target
* inode and return info to allow rewrite
* if not at end, add name to cache; if at end and neither creating
* nor deleting, add name to cache
*/
int
cd9660_lookup(void *v)
{
struct vop_lookup_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
} */ *ap = v;
struct vnode *vdp; /* vnode for directory being searched */
struct iso_node *dp; /* inode for directory being searched */
struct iso_mnt *imp; /* file system that directory is in */
struct buf *bp; /* a buffer of directory entries */
struct iso_directory_record *ep = NULL;
/* the current directory entry */
int entryoffsetinblock; /* offset of ep in bp's buffer */
int saveoffset = -1; /* offset of last directory entry in dir */
int numdirpasses; /* strategy for directory search */
doff_t endsearch; /* offset to end directory search */
struct vnode *pdp; /* saved dp during symlink work */
struct vnode *tdp; /* returned by cd9660_vget_internal */
u_long bmask; /* block offset mask */
int error;
ino_t ino = 0;
int reclen;
u_short namelen;
char altname[ISO_MAXNAMLEN];
int res;
int assoc, len;
const char *name;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
kauth_cred_t cred = cnp->cn_cred;
int flags;
int nameiop = cnp->cn_nameiop;
flags = cnp->cn_flags;
bp = NULL;
*vpp = NULL;
vdp = ap->a_dvp;
dp = VTOI(vdp);
imp = dp->i_mnt;
/*
* Check accessiblity of directory.
*/
if ((error = VOP_ACCESS(vdp, VEXEC, cred)) != 0)
return (error);
if ((flags & ISLASTCN) && (vdp->v_mount->mnt_flag & MNT_RDONLY) &&
(cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
return (EROFS);
/*
* We now have a segment name to search for, and a directory to search.
*
* Before tediously performing a linear scan of the directory,
* check the name cache to see if the directory/name pair
* we are looking for is known already.
*/
if (cache_lookup(vdp, cnp->cn_nameptr, cnp->cn_namelen,
cnp->cn_nameiop, cnp->cn_flags, NULL, vpp)) {
return *vpp == NULLVP ? ENOENT : 0;
}
len = cnp->cn_namelen;
name = cnp->cn_nameptr;
/*
* A leading `=' means, we are looking for an associated file
*/
assoc = (imp->iso_ftype != ISO_FTYPE_RRIP && *name == ASSOCCHAR);
if (assoc) {
len--;
name++;
}
/*
* If there is cached information on a previous search of
* this directory, pick up where we last left off.
* We cache only lookups as these are the most common
* and have the greatest payoff. Caching CREATE has little
* benefit as it usually must search the entire directory
* to determine that the entry does not exist. Caching the
* location of the last DELETE or RENAME has not reduced
* profiling time and hence has been removed in the interest
* of simplicity.
*/
bmask = imp->im_bmask;
if (nameiop != LOOKUP || dp->i_diroff == 0 ||
dp->i_diroff > dp->i_size) {
entryoffsetinblock = 0;
dp->i_offset = 0;
numdirpasses = 1;
} else {
dp->i_offset = dp->i_diroff;
if ((entryoffsetinblock = dp->i_offset & bmask) &&
(error = cd9660_blkatoff(vdp, (off_t)dp->i_offset, NULL,
&bp)))
return (error);
numdirpasses = 2;
iso_nchstats.ncs_2passes++;
}
endsearch = dp->i_size;
searchloop:
while (dp->i_offset < endsearch) {
/*
* If offset is on a block boundary,
* read the next directory block.
* Release previous if it exists.
*/
if ((dp->i_offset & bmask) == 0) {
if (bp != NULL)
brelse(bp, 0);
error = cd9660_blkatoff(vdp, (off_t)dp->i_offset,
NULL, &bp);
if (error)
return (error);
entryoffsetinblock = 0;
}
/*
* Get pointer to next entry.
*/
KASSERT(bp != NULL);
ep = (struct iso_directory_record *)
((char *)bp->b_data + entryoffsetinblock);
reclen = isonum_711(ep->length);
if (reclen == 0) {
/* skip to next block, if any */
dp->i_offset =
(dp->i_offset & ~bmask) + imp->logical_block_size;
continue;
}
if (reclen < ISO_DIRECTORY_RECORD_SIZE)
/* illegal entry, stop */
break;
if (entryoffsetinblock + reclen > imp->logical_block_size)
/* entries are not allowed to cross boundaries */
break;
namelen = isonum_711(ep->name_len);
if (reclen < ISO_DIRECTORY_RECORD_SIZE + namelen)
/* illegal entry, stop */
break;
/*
* Check for a name match.
*/
switch (imp->iso_ftype) {
default:
if ((!(isonum_711(ep->flags)&4)) == !assoc) {
if ((len == 1
&& *name == '.')
|| (flags & ISDOTDOT)) {
if (namelen == 1
&& ep->name[0] == ((flags & ISDOTDOT) ? 1 : 0)) {
/*
* Save directory entry's inode number and
* release directory buffer.
*/
dp->i_ino = isodirino(ep, imp);
goto found;
}
if (namelen != 1
|| ep->name[0] != 0)
goto notfound;
} else if (!(res = isofncmp(name,len,
ep->name,namelen,
imp->im_joliet_level))) {
if (isonum_711(ep->flags)&2)
ino = isodirino(ep, imp);
else
ino = dbtob(bp->b_blkno)
+ entryoffsetinblock;
saveoffset = dp->i_offset;
} else if (ino)
goto foundino;
#ifdef NOSORTBUG /* On some CDs directory entries are not sorted correctly */
else if (res < 0)
goto notfound;
else if (res > 0 && numdirpasses == 2)
numdirpasses++;
#endif
}
break;
case ISO_FTYPE_RRIP:
if (isonum_711(ep->flags)&2)
ino = isodirino(ep, imp);
else
ino = dbtob(bp->b_blkno) + entryoffsetinblock;
dp->i_ino = ino;
cd9660_rrip_getname(ep,altname,&namelen,&dp->i_ino,imp);
if (namelen == cnp->cn_namelen) {
if (imp->im_flags & ISOFSMNT_RRCASEINS) {
if (strncasecmp(name, altname, namelen) == 0)
goto found;
} else {
if (memcmp(name, altname, namelen) == 0)
goto found;
}
}
ino = 0;
break;
}
dp->i_offset += reclen;
entryoffsetinblock += reclen;
}
if (ino) {
foundino:
dp->i_ino = ino;
if (saveoffset != dp->i_offset) {
if (cd9660_lblkno(imp, dp->i_offset) !=
cd9660_lblkno(imp, saveoffset)) {
if (bp != NULL)
brelse(bp, 0);
if ((error = cd9660_blkatoff(vdp,
(off_t)saveoffset, NULL, &bp)) != 0)
return (error);
}
entryoffsetinblock = saveoffset & bmask;
ep = (struct iso_directory_record *)
((char *)bp->b_data + entryoffsetinblock);
dp->i_offset = saveoffset;
}
goto found;
}
notfound:
/*
* If we started in the middle of the directory and failed
* to find our target, we must check the beginning as well.
*/
if (numdirpasses == 2) {
numdirpasses--;
dp->i_offset = 0;
endsearch = dp->i_diroff;
goto searchloop;
}
if (bp != NULL)
brelse(bp, 0);
/*
* Insert name into cache (as non-existent) if appropriate.
*/
cache_enter(vdp, *vpp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_flags);
return (nameiop == CREATE || nameiop == RENAME) ? EROFS : ENOENT;
found:
if (numdirpasses == 2)
iso_nchstats.ncs_pass2++;
/*
* Found component in pathname.
* If the final component of path name, save information
* in the cache as to where the entry was found.
*/
if ((flags & ISLASTCN) && nameiop == LOOKUP)
dp->i_diroff = dp->i_offset;
/*
* Step through the translation in the name. We do not `iput' the
* directory because we may need it again if a symbolic link
* is relative to the current directory. Instead we save it
* unlocked as "pdp". We must get the target inode before unlocking
* the directory to insure that the inode will not be removed
* before we get it. We prevent deadlock by always fetching
* inodes from the root, moving down the directory tree. Thus
* when following backward pointers ".." we must unlock the
* parent directory before getting the requested directory.
* There is a potential race condition here if both the current
* and parent directories are removed before the `iget' for the
* inode associated with ".." returns. We hope that this occurs
* infrequently since we cannot avoid this race condition without
* implementing a sophisticated deadlock detection algorithm.
* Note also that this simple deadlock detection scheme will not
* work if the file system has any hard links other than ".."
* that point backwards in the directory structure.
*/
pdp = vdp;
/*
* If ino is different from dp->i_ino,
* it's a relocated directory.
*/
brelse(bp, 0);
if (flags & ISDOTDOT) {
VOP_UNLOCK(pdp); /* race to get the inode */
error = cd9660_vget_internal(vdp->v_mount, dp->i_ino, &tdp,
dp->i_ino != ino, ep);
vn_lock(pdp, LK_EXCLUSIVE | LK_RETRY);
if (error)
return error;
*vpp = tdp;
} else if (dp->i_number == dp->i_ino) {
vref(vdp); /* we want ourself, ie "." */
*vpp = vdp;
} else {
error = cd9660_vget_internal(vdp->v_mount, dp->i_ino, &tdp,
dp->i_ino != ino, ep);
if (error)
return (error);
*vpp = tdp;
}
/*
* Insert name into cache if appropriate.
*/
cache_enter(vdp, *vpp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_flags);
return 0;
}